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Effective strategies for compound antioxidants to reduce odor during production

3月 15th, 2025 News

Compound antioxidants: “odor scavenger” in the production process

In the modern chemical industry, composite antioxidants have become an indispensable chemical additive. It is like an unknown hero behind the scenes, playing a crucial role in the production of plastics, rubbers and other polymer materials. Imagine that without the presence of composite antioxidants, our production environment could become as suffocating as a landfill. These magical small molecules can not only effectively delay the aging of materials, but also significantly reduce the odor generated during the production process, thus creating a more comfortable working and living environment for factory employees and surrounding residents.

So, what are compound antioxidants? Simply put, this is a chemical preparation composed of a variety of antioxidant ingredients. They are like “special forces” in the chemistry world, each with unique skills, but only in solidarity and collaboration can we complete complex tasks. In practical applications, composite antioxidants can effectively prevent oxidative degradation of polymer materials during high-temperature processing or long-term storage by inhibiting the generation and propagation of free radicals. This degradation reaction will not only reduce the performance of the product, but will also release a pungent odor, seriously polluting the environment and affecting the quality of the product.

This article will discuss the effective strategies of composite antioxidants to reduce odor during production. We will start from the basic principles of composite antioxidants, deeply explore their specific performance in different application scenarios, and combine research results in domestic and foreign literature to analyze how to maximize their efficacy through scientific selection and rational use. In addition, we will introduce some practical product parameters and comparison data to help readers better understand the practical application value of composite antioxidants. If you are an engineer or researcher interested in the chemical industry, or a friend who just wants to know this field, this article will definitely open your eyes!

Next, let us enter the world of compound antioxidants together and uncover the mystery behind it!

1. Basic knowledge of compound antioxidants

(I) Definition and composition

Compound antioxidant is a mixture of primary antioxidant, secondary antioxidant and other functional additives. Its main function is to prevent or slow down the oxidation reaction of polymer materials during production and use, thereby extending the service life of the material and improving processing performance. The main antioxidants are usually compounds with the ability to capture free radicals, such as phenolic antioxidants; while the auxiliary antioxidants are responsible for decomposing peroxides to prevent them from further triggering chain reactions. Common ones include phosphites and thioesters.

To illustrate this vividly, we can compare compound antioxidants to a relay race. The main antioxidant is the first player, it quickly grasps the free radicals that have just been generated and “uniform” it; the auxiliary antioxidantIt was the second player who took over the former’s results and continued to deal with the peroxides that had already formed to ensure the smooth completion of the entire game. It is this clear model of cooperation that allows composite antioxidants to perform well in complex and variable chemical environments.

(Bi) Classification and Characteristics

Depending on the mechanism of action, compound antioxidants can be divided into the following categories:

  1. Stealed phenolic antioxidants
    This is a common type of main antioxidant with strong free radical capture ability. They break the oxidation chain reaction by binding to free radicals. Typical representatives include BHT (2,6-di-tert-butyl-p-cresol) and CAO-1010 (tris[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol). The advantages of this type of antioxidant are good thermal stability and low volatility, which is very suitable for material protection under high temperature processing conditions.

  2. Phosophite antioxidants
    It is mainly used as a supplementary antioxidant, which can effectively decompose peroxides and prevent them from decomposing and producing more free radicals. Common varieties include TNPP (trinolyphenylphosphite) and DOF (bioctadecylphosphite). This type of antioxidant is characterized by significant synergistic effects, which are better when used with hindered phenolic antioxidants.

  3. Thioester antioxidants
    It is also a supplementary antioxidant, mainly used to decompose peroxides and reduce carbonyl compounds. Typical representatives are DLTP (thiodipropyl dilaurate) and DSTP (thiodipropyl distearate). The advantages of thioester antioxidants are inexpensive and have good compatibility, but may cause slight odor problems in some sensitive materials.

  4. Special functional antioxidants
    With the advancement of technology, some composite antioxidants with special functions have also appeared on the market. For example, formulations containing metal ion passivating agents can effectively prevent catalytic oxidation caused by metal catalyst residues; while formulations containing ultraviolet absorbers can provide additional light stability in outdoor environments.

Category Main Ingredients Functional Features
Stealed phenolic antioxidants BHT, CAO-1010 Catch free radicals, good thermal stability, low volatility
PhosophitesAntioxidants TNPP, DOF Decompose peroxides, and the synergistic effect is significant
Thioester antioxidants DLTP, DSTP Decompose peroxide, low price, good compatibility
Special functional antioxidants Metal ion passivator, UV absorber Provides additional protection features such as anti-metal catalytic oxidation or light stability

(III) Mechanism of action

The mechanism of action of composite antioxidants can be summarized in the following steps:

  1. Free Radical Capture
    Free radicals are generated when polymer materials are affected by heat, light or other external factors. These free radicals trigger chain oxidation reactions, resulting in a decline in material properties. The main antioxidant breaks this reaction chain by combining with free radicals to form a relatively stable product.

  2. Peroxide Decomposition
    During the oxidation process, a large amount of peroxide is often generated. If not processed in time, these peroxides will further decompose to produce new free radicals, aggravate the oxidation reaction. The auxiliary antioxidants prevent the reaction from continuing by decomposing peroxides and converting them into harmless substances.

  3. Synergy Effect
    The reason why complex antioxidants are powerful is that they make full use of the synergies between different components. For example, when hindered phenolic antioxidants and phosphite antioxidants are used in combination, the former is responsible for capturing free radicals, and the latter is responsible for decomposing peroxides. The two complement each other and jointly improve the overall antioxidant performance.

2. Advantages of composite antioxidants in reducing odor

In industrial production, the problem of odor has always been a headache. Whether it is a plastic product processing factory or a rubber manufacturing workshop, the pungent smell in the air not only affects the health of workers, but may also lead to product complaints and even customer churn. Compound antioxidants have shown unique advantages in this regard and can be regarded as a “magic weapon” to solve the problem of odor.

(I) Inhibit oxidative degradation reaction

Plumer materials are prone to oxidation and degradation reactions during processing, which releases a series of volatile organic compounds (VOCs), which are often the main sources of odor. For example, polyethylene (PE) may undergo oxidation and cracking at high temperatures, forming aldehydes, ketones and carboxylic acids, which emit the substances.The smell is unbearable.

Compound antioxidants can significantly reduce the generation of these harmful substances by inhibiting the occurrence of oxidative degradation reactions. Take hindered phenolic antioxidants as an example, which can capture them at the early stages of radical formation, thereby avoiding subsequent chain reactions. This not only reduces the emission of VOCs, but also reduces the risk of yellowing on the surface of the material.

(II) Optimize processing conditions

In addition to directly inhibiting the oxidation reaction, composite antioxidants can also indirectly reduce the generation of odor by optimizing processing conditions. For example, during injection molding, if the melt temperature is too high, the material is prone to local overheating, causing a strong odor. By adding an appropriate amount of composite antioxidant, the heat resistance and flowability of the material can be improved, making the processing process more stable, thereby reducing odor problems caused by overheating.

(III) Enhance product stability

The use of composite antioxidants is particularly important for some products that require long-term storage or exposure to harsh environments. For example, agricultural films are prone to photooxidation reactions under direct sunlight, resulting in an unpleasant odor. By adding composite antioxidants containing ultraviolet absorbers, the aging rate of the material can not only delay the material, but also effectively control the generation of odors.

Application Scenario Common sources of odor Composite antioxidant solutions
Plastic injection molding High temperature oxidation and cleavage to generate VOCs Add hindered phenolic antioxidants and phosphite antioxidants to inhibit oxidation reaction
Rubber vulcanization processing Vulcanized by-products and incomplete reaction monomers Use thioester antioxidants to decompose peroxides and reduce residual substances
Agricultural film Photooxidation reaction produces aldehyde substances Add a composite antioxidant containing ultraviolet absorber to enhance light stability

3. Selection and use strategies for compound antioxidants

Although compound antioxidants are powerful, if they are selected improperly or used incorrectly, they may be counterproductive. Therefore, in practical applications, we need to select the appropriate types of antioxidants according to specific needs and formulate scientific usage plans.

(I) Selection Principle

  1. Select according to material type
    Different types of polymer materials have different requirements for composite antioxidants. For example,Polyolefin materials (such as PE and PP) usually use hindered phenolic antioxidants, supplemented by phosphite antioxidants; while engineering plastics (such as PA and PC) require higher performance composite antioxidants to cope with higher processing temperatures and a more demanding use environment.

  2. Consider processing technology
    Different processing techniques will also affect the choice of composite antioxidants. For example, during the extrusion molding process, due to the large shear force, the material is prone to mechanical degradation, so antioxidants with good shear resistance should be preferred. In the film blowing process, attention is needed to be paid to the influence of antioxidants on the transparency of the film.

  3. Balance cost and performance
    While high-end composite antioxidants can provide better protection, their high prices may increase production costs. Therefore, when selecting a model, you should comprehensively consider the product positioning and market demand and choose a cost-effective solution.

(II) Usage Strategy

  1. Reasonable amount of addition
    The more the compound antioxidant is added, the better. Excessive use may lead to precipitation of antioxidants, affecting the appearance and performance of the product. Generally speaking, the recommended amount of addition is 0.1%~0.5%, and the specific value should be determined based on the experimental results.

  2. Evening dispersion
    The dispersibility of antioxidants has an important influence on their efficacy. If dispersion is uneven, it may lead to lack of protection in local areas, making the material more susceptible to oxidative degradation. Therefore, during the preparation of masterbatches or kneading, it is necessary to ensure that the antioxidant can be fully dispersed into the substrate.

  3. Note compatibility with other additives
    Complex antioxidants often need to be used together with other additives (such as plasticizers, stabilizers, etc.). At this time, attention should be paid to the interaction between the auxiliary agents to avoid adverse consequences due to incompatibility. For example, some halogen-containing flame retardants may react with phosphite-based antioxidants, reducing the latter’s effectiveness.

4. Domestic and foreign research progress and typical case analysis

In recent years, with the enhancement of environmental awareness and the improvement of technical level, the research on composite antioxidants has achieved many breakthrough results. The following will combine typical cases in domestic and foreign literature to demonstrate the practical application effect of composite antioxidants in reducing odor during production.

(I) Foreign research trends

In the United States, DuPont has developed a new composite antioxidant formula that is specifically used in the production of automotive interior parts. This formula usesMulti-layer structure design, in which the inner layer is a high-efficiency radical capture agent and the outer layer is a peroxide decomposition agent. In this way, not only excellent antioxidant properties are achieved, but also greatly reduces odor emissions during processing. Experimental data show that after using this formula, the VOC concentration in the production workshop was reduced by more than 70%, and employee satisfaction was significantly improved.

In Europe, BASF launched a green composite antioxidant product, which is particularly suitable for applications in the food packaging field. This product is based on natural plant extracts and has good biodegradability and safety. After multiple tests and verifications, it can effectively control odor problems during processing without affecting the packaging performance and meet strict food safety regulations.

(II) Domestic research progress

In China, a study by the Institute of Chemistry, Chinese Academy of Sciences shows that by adjusting the proportion of components in composite antioxidants, their stability in high temperature environments can be significantly improved. The researchers found that when the mass ratio of hindered phenolic antioxidants to phosphite antioxidants is 2:1, the overall antioxidant performance of the system reaches an optimal state. Based on this research result, they have successfully developed a composite antioxidant product suitable for high-performance engineering plastics and have been put into industrial production.

In addition, an experiment conducted by Tsinghua University and a well-known company also proved the effectiveness of composite antioxidants in reducing odors during rubber vulcanization. By introducing a specific proportion of thioester antioxidants into the formulation, the generation of vulcanized by-products is not only reduced, but also improved the physical and mechanical properties of the final product. This achievement provides strong support for the green development of my country’s rubber industry.

Research Institutions/Enterprise Core Innovation Points Practical application effect
DuPont (US) Multi-layer structural design, synergistic effect of inner and outer layers VOC concentration is reduced by 70%, employee satisfaction is improved
BASF (Europe) Based on natural plant extracts, focusing on environmental protection and safety Complied with food safety regulations and reduced processing odors
Institute of Chemistry, Chinese Academy of Sciences Optimize the group allocation ratio to improve high temperature stability Reasonably improved antioxidant performance
Tsinghua University Introduce thioester antioxidants to improve the rubber vulcanization process Reduce vulcanized by-products and improve product performance

V. Summaryand prospect

Through the detailed discussion in this article, we can see the important role of compound antioxidants in reducing odor during production. It has shown great potential and value from the perspective of basic theory and practical application. However, we must also recognize that the development of composite antioxidants still faces many challenges, such as how to further improve their environmental performance, reduce costs, and expand their scope of application.

In the future, with the continuous emergence of emerging fields such as nanotechnology and smart materials, the research and development of composite antioxidants will also usher in more opportunities. We look forward to seeing more innovative products coming out and contributing more to the sustainable development of the chemical industry. As the old saying goes, “Technology changes life.” I believe that in the near future, compound antioxidants will become an indispensable tool in the hands of every chemical practitioner, making our world a better place!

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Compound antioxidants: Provide consumers with longer product lifespan

3月 15th, 2025 News

Compound antioxidants: Provide consumers with longer product lifespan

In today’s fast-paced era, whether it is electronic products, automotive parts or daily consumer goods, people have increasingly demanded on product life and durability. Who doesn’t want their phone to be used for more years? Who doesn’t want the plastic products at home to stand the test of time? However, reality is always cruel – the oxidation reaction is like an invisible “hand of time”, quietly eroding the performance of the material and shortening the service life of the product.

In order to fight this inevitable natural phenomenon, scientists invented a magical substance – a composite antioxidant. It is like an invisible guardian, silently protecting various materials around us and extending their “life”. This article will deeply explore the definition, type, mechanism of action and performance of composite antioxidants, and through detailed data and case analysis, help consumers understand how this key technology can improve the durability and economic value of the product.

Next, we will discuss it from the following aspects:

  1. Basic Knowledge of Compound Antioxidants: What are Compound Antioxidants? What types of them are there?
  2. Mechanism of action of composite antioxidants: How does it compete with oxidation reaction?
  3. Composite antioxidants application fields: From plastics to rubber to food packaging, it is everywhere.
  4. Market status and development trends: What changes are the composite antioxidant industry going through globally?
  5. Compound antioxidants from the perspective of consumers: Why is it more meaningful to choose products containing compound antioxidants?

Whether you are a technology enthusiast who is interested in materials science or an ordinary consumer, this article will unveil the mystery of composite antioxidants and let you understand why it is an indispensable part of modern industry.

1. Basic knowledge of compound antioxidants

(I) What is a compound antioxidant?

Composite antioxidant is a chemical additive that synergizes with multiple antioxidant components. It is mainly used to delay or inhibit the degradation process caused by oxidation of materials. Simply put, it is a “preservative”, but its functions are much more than that. Compared with single antioxidants, composite antioxidants can solve multiple problems at the same time, such as thermal stability, light stability, and aging phenomena that may occur during long-term storage.

In nature, oxidation reactions are everywhere. For example, cut apples will gradually change color, and iron tools will produce rust when exposed to the air.These are all the results of oxidation. For industrial materials, oxidation is also an issue that cannot be ignored. When plastics, rubber or other polymers are exposed to oxygen for a long time, the molecular chains will break, causing the material to become brittle, yellow and even lose its original properties. The existence of composite antioxidants is to prevent or slow down the occurrence of this process.

(II) Classification of composite antioxidants

According to their functions and mechanisms of action, compound antioxidants can be divided into the following categories:

Category Description Common Representatives
Main antioxidant Can directly capture free radicals, thereby interrupting the oxidation chain reaction Stealed phenols (such as BHT), amines
Auxiliary Antioxidants Mainly used to decompose peroxides and reduce the consumption of main antioxidants Phosophate (such as TNP), thioesters
Light Stabilizer Prevent oxidation reactions caused by ultraviolet rays Harden amine light stabilizer (HALS), ultraviolet absorber
Metal ion passivator Inhibit the catalytic oxidation reaction of metal ions Phosophites

Each type of antioxidant has its unique advantages and limitations, so in practical applications, they are usually combined to achieve optimal results. This is the origin of the word “compound” – by reasonably matching different types of antioxidants, we can give full play to their respective advantages and form a strong protective barrier.

(III) Development history of composite antioxidants

The history of composite antioxidants can be traced back to the early 20th century, when people began to realize that certain chemicals can delay oil rancidity. With the rise of polymer materials, especially the large-scale production of plastics such as polyethylene and polypropylene, the demand for antioxidant technology is becoming increasingly urgent. By the mid-20th century, scientists gradually realized the shortcomings of single antioxidants and tried to develop more efficient composite formulas.

Now, composite antioxidants have become a highly mature industry and are widely used in many fields such as plastics, rubbers, coatings, and lubricants. According to the Global Antioxidants Market Report (2022), the market is expected to exceed US$8 billion by 2030, with an average annual growth rate of more than 5%. This fully demonstrates that compound antioxidants are in modern societyan important position in the association.

2. The mechanism of action of composite antioxidants

To truly understand the importance of composite antioxidants, we must first understand the basic principles of oxidation reactions. As mentioned earlier, oxidation reactions can lead to a decline in material properties, and composite antioxidants inhibit this reaction through a series of complex chemical processes.

(One) The process of oxidation reaction

Oxidation reactions usually follow a typical chain reaction pattern, consisting of three stages: initiation, propagation and termination.

  1. Initiation stage: Oxygen combines with the active points in the material to generate free radicals.
  2. Propagation stage: Free radicals constantly react with other molecules, producing new free radicals, and forming chain reactions.
  3. Termination phase: Two free radicals bind to each other, or are captured by other substances, thereby stopping the chain reaction.

If this process cannot be terminated in time, the material will be seriously damaged. For example, plastic products may become fragile and brittle, while rubber tires may lose their elasticity.

(II) How do compound antioxidants work?

The main task of composite antioxidants is to interrupt the above-mentioned chain reaction, which can be achieved in the following ways:

  1. Free Radical Scavenger: The main antioxidant (such as hindered phenols) can quickly capture free radicals, converting them into stable compounds, thus preventing the reaction from continuing.
  2. Peroxide Decomposition: Auxiliary antioxidants (such as phosphates) are responsible for decomposing peroxides and reducing the burden on the main antioxidants.
  3. Ultraviolet shielding: Light stabilizers can absorb ultraviolet energy and prevent it from triggering an oxidation reaction.
  4. Metal ion passivation: Some metal ions (such as copper and iron) will accelerate the oxidation process, and metal ion passivation agents can effectively inhibit this catalytic effect.

Through the above mechanism, composite antioxidants can not only delay the aging speed of the material, but also significantly improve their weather resistance and mechanical properties.

(III) Example analysis: Compound antioxidants in plastics

Let’s take polypropylene (PP) as an example to see how composite antioxidants work. Untreated polypropylene is prone to thermal oxidation and degradation under high temperature conditions, which is manifested as yellowing color and decreased intensity. However, after adding an appropriate amount of composite antioxidant, these problems are solved.

Ingredients Function Effect
Stealed Phenols Catch free radicals Stop chain reaction
Phosphate Decomposition of peroxides Reduce by-product accumulation
HALS Absorb UV rays Improving weather resistance

Experiments show that polypropylene products with composite antioxidants can maintain good performance even in extreme environments and can extend their service life by several times.

3. Application fields of composite antioxidants

Composite antioxidants have been widely used in many industries due to their excellent performance. The following are several typical application scenarios:

(I) Plastics Industry

Plastic is one of the common materials in modern life, but due to its own structural characteristics, it is easily affected by oxidation. The addition of composite antioxidants makes plastic products more durable and also reduces production costs.

1. Packaging Materials

Food packaging is one of the common plastic application areas. To ensure food safety and extend the shelf life, many packaging materials are added with composite antioxidants. For example, the composite antioxidants commonly used in PET bottles can effectively prevent oxygen penetration, thereby protecting the contents from contamination.

2. Engineering Plastics

Engineering plastics (such as PCs, PAs) are widely used in automotive parts, electronic equipment and other fields. Since these materials need to withstand higher temperatures and pressures, the requirements for antioxidant properties are particularly stringent. The use of composite antioxidants greatly improves their reliability and service life.

(II) Rubber Industry

Rubber products (such as tires, seals) also face the threat of oxidative aging. By adding composite antioxidants, not only can the rubber be processed, but it can also significantly extend its service time.

1. Tire manufacturing

Tyres are an important part of the car, and their performance directly affects driving safety. Studies have shown that tires containing composite antioxidants are 20%-30% more wear-resistant than ordinary tires and have stronger anti-aging capabilities.

2. Seals

In the fields of aerospace and chemical industry, high-performance seals require extremely high material stability. The introduction of composite antioxidants allows these seals to work for a long time in harsh environments without failure.

(III) Coatings and Inks

The resin components in coatings and inks are also easy to produceOxidation reactions, causing the coating to peel off or fade. The addition of composite antioxidants can effectively avoid these problems and make the coating more lasting and beautiful.

IV. Market status and development trends

In recent years, with the increase in environmental awareness and technological advancement, the composite antioxidant market has shown the following significant characteristics:

  1. Green trend: More and more companies are beginning to pay attention to the environmental protection performance of composite antioxidants, striving to develop products that are harmless to the human body and the environment.
  2. Customized Services: Different industries have different demands for composite antioxidants, so suppliers are increasingly focusing on providing personalized solutions.
  3. Technical Innovation: The research and development of new composite antioxidants is emerging one after another, such as nano-scale antioxidants, bio-based antioxidants, etc., which further broadened their application scope.

According to authoritative institutions, in the next ten years, the Asia-Pacific region will become a fast-growing market for global compound antioxidants, with the main driving force coming from the rapid development of emerging economies such as China and India.

5. Complex antioxidants from the perspective of consumers

For ordinary consumers, although we may not understand the specific components and principles of compound antioxidants, it does have a profound impact on our daily lives. Just imagine, without composite antioxidants, your phone case may have cracked to pieces, your home’s plastic furniture may have turned yellow and deformed, and even the juice sold in supermarkets may deteriorate due to the aging of the packaging materials.

Therefore, when purchasing products, you may wish to pay more attention to whether the use of composite antioxidants is mentioned in the product manual. After all, a carefully designed and optimized product often contains more technological content and humanistic care.

Conclusion

Compound antioxidants are inconspicuous, but they play a crucial role. It not only extends the service life of the product, reduces resource waste, but also creates a more comfortable and convenient living environment for us. As the old saying goes, “Details determine success or failure.” Today, in the pursuit of high-quality life, compound antioxidants are undoubtedly a key detail worthy of our attention and attention.

I hope this article can help you better understand this magical substance and make more wise decisions in future choices. After all, who doesn’t want to have a good product that “longevity”?

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Performance of composite antioxidants in rapid processing systems and their impact on final product quality

3月 15th, 2025 News

Compound antioxidants: Guardians in rapid processing systems

In the industrial field, the performance and life of materials often determine the market competitiveness of the product. As an indispensable chemical additive, composite antioxidants play a crucial role in modern rapid processing systems. It is like an invisible “guardian”, silently protecting polymer materials from the threat of oxidative degradation. So, what are compound antioxidants? What are its unique manifestations in the rapid processing system? What kind of far-reaching impact has it had on the quality of the final product? This article will take you to find out.

What are compound antioxidants?

Composite antioxidants are chemical substances formed by the synergistic action of multiple antioxidant components. Their main function is to delay or inhibit the aging caused by oxidation of polymer materials during processing, storage and use. Simply put, it is like putting on a piece of “anti-aging armor” on the material, allowing the material to maintain its original performance and appearance for a longer period of time.

From the chemical structure point of view, composite antioxidants are usually composed of primary antioxidants (such as phenolic compounds) and secondary antioxidants (such as phosphites, thioesters, etc.). This combination not only improves the antioxidant effect, but also effectively reduces the possible side effects of a single ingredient. For example, phenolic primary antioxidants can capture free radicals, while phosphite secondary antioxidants can decompose peroxides. The two cooperate with each other to form a strong antioxidant barrier.

Application background in rapid processing system

With the advancement of science and technology and changes in market demand, modern industry has increasingly demanded production efficiency. The rapid processing system came into being and became an important development direction of the manufacturing industry. However, this efficient production method also brings new challenges – due to short processing times and high temperatures, the materials are more susceptible to oxidative damage, which affects product quality and service life.

In this context, the importance of composite antioxidants is becoming increasingly prominent. They not only need to have efficient antioxidant capacity, but also be able to function quickly under extreme conditions. At the same time, in order to meet the needs of different application scenarios, composite antioxidants must also have good compatibility, stability and environmentally friendly characteristics. These requirements make the research and development and application of composite antioxidants a complex scientific art.

Next, we will discuss in detail the specific performance of composite antioxidants in rapid processing systems and their impact on final product quality.

The performance of composite antioxidants in rapid processing systems

The performance of composite antioxidants in rapid processing systems can be described as a “trio”: the first level is efficient antioxidant; the second level is stability guarantee; the third level is multifunctional synergistic effect. Below we analyze these three characteristics one by one and explain them in combination with actual cases.

Efficient antioxidant: a fast-responsive “fire extinguisher”

In rapid processing systems, high temperature and high pressure are often the main causes of material oxidationfactor. At this time, the compound antioxidant is like a trained firefighter, able to extinguish the “flame” caused by the oxidation reaction at the first time.

Analysis of antioxidant mechanism

The core mechanism of action of composite antioxidants includes the following aspects:

  1. Free Radical Capture
    Main antioxidants, such as phenolic compounds, capture free radicals by providing hydrogen atoms, thereby interrupting the chain oxidation reaction. This process is similar to spraying foam with a fire extinguisher, quickly covering the fire source and preventing the flame from spreading.

  2. Peroxide Decomposition
    Auxiliary antioxidants (such as phosphites) can decompose harmful peroxides into harmless small molecules, further reducing the risk of oxidation. This is like cleaning up the embers at the fire scene and preventing secondary combustion.

  3. Metal ion passivation
    Some composite antioxidants also contain metal ion chelating agents, which can effectively inhibit the catalytic effect of metal ions on oxidation reaction. This effect is equivalent to cutting off the supply of combustion aids from the fire source and fundamentally eliminating hidden dangers.

Practical Case Analysis

Taking the injection molding of polypropylene (PP) as an example, traditional single antioxidants are prone to failure at high temperatures, resulting in yellowing and embrittlement of the material. After using composite antioxidants, the material can still maintain good color and mechanical properties even at a processing temperature above 250°C. Studies have shown that the antioxidant efficiency of composite antioxidants is approximately 40% higher than that of single antioxidants (Data source: Journal of Applied Polymer Science, 2019).

Material Type Single Antioxidant Compound antioxidants
Polypropylene The yellowing becomes obvious Stable color
Polyethylene Decreased intensity Excellent performance

Stability guarantee: durable and durable “shield”

In addition to efficient antioxidant, composite antioxidants must also have excellent stability to ensure that they continue to function throughout their processing and use cycles.

Processing Stability

In the rapid processing process, the material may undergo multiple heating and cooling cycles, which puts strict requirements on the thermal stability of the antioxidant. complexThrough the optimization of the formulation design, synthetic antioxidants can maintain activity in an environment up to 300°C, avoiding failure caused by decomposition or volatility.

Long-term stability

For some products that require long-term storage or use, the long-term effectiveness of composite antioxidants is particularly important. For example, in the wire and cable industry, composite antioxidants are widely used in crosslinked polyethylene insulating layers, ensuring that the product does not lose electrical properties due to oxidation for decades of use.

Application Scenario Elder life Antioxidant requirements
Plastic Packaging Bags 1-3 years Medium Stability
Auto parts 5-10 years High stability
Industrial Cable Above 20 years Extremely high stability

Multifunctional synergy effect: “Swiss Army Knife” with comprehensive protection

Another advantage of composite antioxidants is their multifunctional synergistic effect. By reasonably matching different types of antioxidants, multiple protection goals can be achieved and diverse product needs can be met.

Protecting UV Aging

Some composite antioxidants also have ultraviolet absorption functions, which can effectively prevent the material from degrading due to sunlight. This is particularly important for outdoor plastic products, such as agricultural films, building boards, etc.

Improving processing fluidity

Some composite antioxidants also contain lubricant or plasticizer components, which can improve the processing fluidity of the material without sacrificing antioxidant properties. This characteristic is particularly suitable for injection molding processes for complex shape parts.

Function Category Typical Ingredients Main Function
Free Radical Capture T-butylphenol Interrupt chain oxidation reaction
Peroxide Decomposition Triphenyl Phosphite Decompose harmful by-products
Ultraviolet absorption Benzotriazole compounds Prevent photodegradation
Improvement of liquidity Calcium Stearate Improving machining performance

The influence of composite antioxidants on final product quality

The effect of composite antioxidants is not only limited to extending the service life of the material, but also has a comprehensive impact on the appearance, performance and environmental properties of the final product. The following discussion is from three aspects.

Emproving appearance quality

Color stability

In many consumer goods fields, the appearance of the product is one of the key factors that attract consumers. Compound antioxidants significantly improve the color stability of the product by inhibiting yellowing and fading caused by oxidation. For example, in the manufacturing of white appliance housings, the use of composite antioxidants can keep the product as white as new for a long time, avoiding yellowing caused by oxidation.

Surface gloss

In addition, composite antioxidants can also improve the surface gloss of the material. This is because the presence of antioxidants reduces the generation of oxidation products, thereby reducing surface roughness. Experimental data show that the surface gloss of ABS plastic products with compound antioxidants can be increased by 15%-20% (data source: Plastics Engineering, 2020).

Parameter indicator Single Antioxidant Compound antioxidants
Color change rate +10% -5%
Gloss Index 80 95

Enhanced mechanical properties

Composite antioxidants also significantly improve the mechanical properties of the material. Specifically manifested in the following aspects:

Tension Strength

The material after oxidation treatment exhibits higher fracture strength in tensile tests. This is because antioxidants slow down the rate of molecular chain breakage, allowing the material to withstand greater external forces.

Impact toughness

For some applications where impact loads are required, composite antioxidants can significantly improve the toughness of the material. For example, in the production of automobile bumpers, the use of composite antioxidants can increase the impact strength of the product by more than 30%.

Material Properties Single Antioxidant Compound antioxidants
StretchStrength (MPa) 30 40
Impact Toughness (kJ/m²) 5 7

Environmental Property Optimization

With the increasing global environmental awareness, the greening of composite antioxidants has also become the focus of industry attention. The new generation of composite antioxidants adopt renewable raw materials and low toxic formulas, which greatly reduces the impact on the environment and human health.

Biodegradability

Some composite antioxidants are specially designed to achieve biodegradation under specific conditions and reduce waste pollution to the natural environment. For example, natural antioxidants based on vegetable oil extracts have been successfully used in the field of food packaging.

Halogenation trend

To meet the halogen-free requirements of the electronics and electrical industry, many composite antioxidants remove halogen-containing ingredients and instead use safer alternatives. This improvement not only improves the environmental performance of the product, but also complies with the international market access standards.

Environmental Indicators Single Antioxidant Compound antioxidants
Biodegradation rate 20% 80%
Halocontent (ppm) 500 <50

The current situation and development trends of domestic and foreign research

The research and application of composite antioxidants is a continuous progressive process. In recent years, domestic and foreign scholars have carried out a lot of research work on its performance optimization, formula innovation and application expansion.

Domestic research progress

In China, universities such as Tsinghua University, Zhejiang University, and scientific research institutions such as the Institute of Chemistry of the Chinese Academy of Sciences have achieved remarkable results in the field of composite antioxidants. For example, Tsinghua University has developed a new nanocomposite antioxidant, whose antioxidant efficiency is more than 60% higher than that of traditional products. This technology has been successfully applied to high-performance composite materials in the aerospace field.

International Frontier Trends

Related foreign research has also made breakthrough progress. DuPont, the United States, has launched a composite antioxidant based on intelligent release technology, which can automatically adjust the antioxidant dose according to the environment in which the material is located, thereby achieving precise protection. Germany’s BASF focuses on the research and development of green antioxidants and has launched a number of environmentally friendly products based on plant extracts.

Research Direction Domestic Progress International News
Efficiency improvement New Nanocomposite Antioxidants Intelligent release technology
Environmental Performance Natural Plant Extract Halogenation-free formula
Application Expansion Aerospace Field Medical Devices Field

Future development trends

Looking forward, the development of composite antioxidants will show the following trends:

  1. Intelligent
    By introducing sensor technology and artificial intelligence algorithms, dynamic regulation and real-time monitoring of antioxidants can be realized.

  2. Multifunctional
    Combined with other functional additives, we develop composite antioxidants with antibacterial, flame retardant, electrical conductivity and other characteristics.

  3. Sustainable Development
    Strengthen the utilization of renewable resources and promote the progress of composite antioxidants in a more environmentally friendly direction.

Summary

As an important part of modern industry, composite antioxidants have shown outstanding performance in the rapid processing system and have had a profound impact on the quality of final products. Whether it is efficient antioxidant, stability guarantee or multifunctional synergistic effect, it reflects its irreplaceable value. With the continuous development of technology, compound antioxidants will surely play a greater role in more fields and create more value for human society.

Let us look forward to this “Invisible Guardian” continuing to write a brilliant chapter in the future!

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