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Application of polyurethane water-based coating anti-yellowing agent in agricultural facilities

3月 17th, 2025 News

Polyurethane water-based coating anti-yellowing agent: “Invisible Guardian” of agricultural facilities

In modern agricultural facilities, whether it is greenhouses, breeding sheds or irrigation systems, the protection of high-performance coatings is inseparable. As a new environmentally friendly and durable material, polyurethane water-based coatings are becoming a star product in the field of agricultural facility protection. However, just like a beauty-loving girl always worrying about her skin being tanned, this paint also faces a difficult problem – yellowing. When the ultraviolet rays in the sun ruthlessly irradiate the coating, the originally white or bright colors will gradually turn yellow, which not only affects the beauty, but may also reduce the performance of the coating.

To solve this problem, scientists have developed a magical “skin care product” – polyurethane water-based coating anti-yellowing agent. It is like a painted sunscreen, which can effectively resist the damage of ultraviolet rays and keep the coating as new as ever. This article will comprehensively explore the important role of this “invisible guardian” in agricultural facilities from multiple angles such as the basic principles of anti-yellowing agents, product parameters, application fields, and domestic and foreign research progress.

1. Basic principles and mechanism of anti-yellowing agent

(I) What is yellowing?

Yellowing is a common aging phenomenon in the use of polyurethane coatings. Simply put, the coating color gradually turns yellow over time. This change not only affects the appearance, but may also lead to a decrease in the physical properties of the coating, such as weakening flexibility and reduced adhesion. This is undoubtedly a fatal problem for agricultural facilities. Just imagine, if the transparent coating of a greenhouse becomes blurred due to yellowing, the photosynthesis efficiency of the plants will be greatly reduced, which will directly affect the yield and quality of crops.

So, how does yellowing happen? The fundamental reason is that there are some groups in the molecular structure of polyurethanes that are prone to oxidation (such as isocyanate groups). When these groups are exposed to UV light, a series of complex chemical reactions occur, which eventually leads to changes in the color of the coating. In addition, high temperatures, humidity and oxygen will also accelerate this process.

(II) Mechanism of action of anti-yellowing agent

To fight yellowing, scientists have designed a variety of types of anti-yellowing agents. These compounds work in the following ways:

  1. Absorb UV light: Some anti-yellowing agents can absorb UV light and convert it into harmless thermal energy, thus preventing UV light from destroying the coating.
  2. Catch Free Radicals: Another type of anti-yellowing agent, like a “scavenger”, specifically captures free radicals caused by ultraviolet light, preventing them from further destroying the coating molecules.
  3. Stable molecular structure: There are also some anti-yellowing agents that can combine with polyurethane molecules to enhance their antioxidant ability and delay the aging process.

Through these mechanisms, the anti-yellowing agent successfully puts a “UV-proof jacket” on the polyurethane coating, allowing it to remain bright as before in harsh environments.

2. Product parameters of polyurethane water-based coating anti-yellowing agent

The requirements for coatings vary in different application scenarios, so anti-yellowing agents also need to be adjusted according to specific needs. The following are the main parameters of several common anti-yellowing agents:

parameter name Anti-yellowing agent A Anti-yellowing agent B Anti-yellowing agent C
Chemical Components Ultraviolet absorber Free Radical Scavenger Molecular Stabilizer
Add ratio (wt%) 0.5~1.0 0.8~1.5 1.0~2.0
Yellow Index (?YI) ?5 ?3 ?2
Weather resistance (hours) >500 >1000 >2000
Cost (yuan/ton) 10000 15000 20000

It can be seen from the above table that although anti-yellowing agent C is high in price, its weather resistance and anti-yellowing effect are good, and it is suitable for agricultural facilities that are exposed to outdoors for a long time; while anti-yellowing agent A is more suitable for short-term or indoor use scenarios due to its low cost and good cost-effectiveness.

3. Specific application of anti-yellowing agents in agricultural facilities

(I) Greenhouse

Greenhouses are an important infrastructure for modern agriculture, and their transparent coatings require excellent optical properties and durability. However, prolonged sun and rain can cause yellowing of traditional coatings, thereby reducing light transmittance. Studies have shown that after adding an appropriate amount of anti-yellowing agent, the light transmittance of the coating can be maintained at more than 90% for up to five years. This is of great significance to improving crop yields.

(II) Breeding shed

Breeding sheds usually require coatings with excellent corrosion and antibacterial properties to protect the metal structure. However, these coatings areIt’s also facing the problem of yellowing. For example, in humid and hot climates in the south, ordinary polyurethane coatings may fade significantly within a year. After adding anti-yellowing agent, the service life of the coating can be extended to more than three years, greatly reducing maintenance costs.

(III) Irrigation system

Pipes and water tanks in agricultural irrigation systems are often exposed to sunlight, so they require extremely high weather resistance of the coating. The application of anti-yellowing agents can not only prevent the coating from discoloration, but also reduce the risk of water leakage due to aging and ensure efficient utilization of water resources.

IV. Progress and development trends at home and abroad

(I) Current status of foreign research

European and American countries began to pay attention to the anti-yellowing problem of polyurethane coatings as early as the 1980s and have achieved a series of important results. For example, DuPont, a composite anti-yellowing agent based on nanotechnology, has nearly three times more weather resistance than traditional products. In Europe, BASF, Germany, focuses on the direction of green chemistry and has launched a number of environmentally friendly anti-yellowing agents, which are widely used in food-grade agricultural facilities.

(II) Domestic research trends

In recent years, my country has also made great progress in research in this field. A study from the School of Materials Science and Engineering of Tsinghua University shows that by optimizing the molecular structure of anti-yellowing agents, its ability to absorb ultraviolet rays can be significantly improved. At the same time, the Institute of Chemistry, Chinese Academy of Sciences has also proposed a new synergistic efficiency mechanism, that is, the effect of “1+1>2” is achieved by mixing two or more anti-yellowing agents.

(III) Future development trends

As the global environmental protection requirements continue to increase, the future anti-yellowing agents will develop in the following directions:

  1. Green and Environmentally friendly: Reduce the emission of harmful substances and develop biodegradable anti-yellowing agents.
  2. Multifunctional: In addition to anti-yellowing function, it should also have additional properties such as antibacterial and fireproof.
  3. Intelligent: Use intelligent material technology to achieve self-healing and dynamic adjustment of coating performance.

5. Conclusion

Polyurethane water-based coating anti-yellowing agents are gaining more and more attention with their practicality and innovation. Whether it is greenhouses, breeding sheds or irrigation systems, it can provide reliable protection for these critical facilities and help agricultural production reach a higher level. As an old saying goes, “Details determine success or failure.” The small anti-yellowing agent makes our lives better through the ultimate pursuit of details.

So, next time you walk into a green farmland, don’t forget to silently hear this unknownThe “hero” salute!

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How to improve the appearance of plastic products when polyurethane water-based coatings

3月 17th, 2025 News

Polyurethane water-based coating anti-yellowing agent: a secret weapon for “beauty” of plastic products

1. Introduction: When plastics are also wanted to “whiten”

In this era of looking at faces, it is no longer a new thing for humans to pursue appearance. But you may not know that even plastic products are silently pursuing “beauty”. Imagine that the originally crystal clear plastic bottle, smooth and shiny car dashboard or fashionable mobile phone case becomes dull or even yellow after being baptized by time. Wouldn’t it be very frustrating? This is like a naturally beautiful girl who loses her glory because she does not take good care of her skin. The anti-yellowing agent in polyurethane water-based coatings is the secret weapon for the “beauty” of these plastic products.

So, what is an anti-yellowing agent? How does it keep plastic products young and energetic? Next, we will explore this topic in depth and analyze the important role of polyurethane water-based coating anti-yellowing agents in improving the appearance of plastic products from chemical principles to practical applications.

2. Why does plastic “aging”? ——The causes of yellowing phenomenon

To understand the effects of anti-yellowing agents, we first need to understand why plastics turn yellow. Yellowing is an inevitable problem in the use of many plastic products, especially when exposed to high temperatures, ultraviolet rays or oxidation environments for a long time, the color of the plastic surface will change and gradually lose its original luster and transparency. This phenomenon not only affects the aesthetics of the product, but may also lead to performance degradation.

(I) The main reasons for yellowing

  1. Photoaging
    Ultraviolet rays are one of the major culprits of plastic yellowing. The ultraviolet energy in sunlight is high, which can destroy the molecular structure of plastics, causing the polymer to decompose and produce colored substances. It’s like a silent “chemical war” that eclipses plastic from the inside out.

  2. Thermal Aging
    During processing or use, high temperatures will accelerate the breakage of the plastic molecular chains, produce free radicals, and then trigger a series of side reactions to form yellow compounds. For example, during injection molding, excessive temperatures may cause some plastic materials to show signs of yellowing early.

  3. Oxidation reaction
    Oxygen is everywhere, but it is an invisible killer to plastic. Oxygen reacts with the unsaturated bonds in the plastic to form carbonyl compounds or other colored products, which eventually leads to yellowing on the surface of the plastic.

  4. Adjuvant decomposition
    Many plastics have added auxiliary components such as stabilizers, plasticizers or dyes. These additives may decompose or deteriorate under specific conditions.Intensify the yellowing phenomenon.

(II) The impact of yellowing on plastic products

Yellow change is not only a visual problem, but also a serious impact on the function of the product. For example:

  • For transparent plastics (such as PC, PMMA), yellowing will reduce its light transmittance and affect optical performance;
  • For electronic device housings, yellowing will make the product look old and affect the user experience;
  • For the automotive industry, yellowing may cause the interior parts to fade, reducing the overall sense of grade.

Therefore, solving the problem of yellowing has become a major challenge in the plastics industry. The emergence of anti-yellowing agents for polyurethane water-based coatings provides an effective solution to this problem.

III. Definition and classification of anti-yellowing agents for polyurethane water-based coatings

(I) What is polyurethane water-based coating?

Polyurethane water-based coating is an environmentally friendly coating with water as the dispersion medium. It is widely used in the surface treatment of various substrates such as wood, metal, and plastic. Compared with traditional solvent-based coatings, it has the advantages of low VOC (volatile organic compounds) emissions, non-toxic and harmless, and is in line with the development trend of modern green chemical industry.

(II) Mechanism of action of anti-yellowing agent

Anti-yellowing agent is a functional additive, mainly used to inhibit or delay the yellowing of plastics and their coatings during use. Specifically, it works in the following ways:

  1. Absorb UV rays: convert harmful UV rays into heat and dissipate them, thereby protecting plastics from photoaging;
  2. Catch free radicals: Neutralize free radicals produced by thermal degradation or oxidation reactions to prevent the occurrence of chain reactions;
  3. Shield Oxygen: Reduce the chance of oxygen contacting plastic molecules and delay the oxidation process.

(III) Classification of anti-yellowing agents

According to chemical structure and functional characteristics, anti-yellowing agents can be divided into the following categories:

Category Chemical Structural Characteristics Main mechanism of action Typical Application Scenarios
Ultraviolet absorber Contains benzotriazole, hydroxybenzone and other groups Absorb UV rays to prevent photoaging Automotive interior, outdoor plastic products
Free Radical Capture Amines and phenolic functional groups Neutectic radicals to inhibit thermal aging Home appliance housing, electronic product housing
Antioxidants Antioxidation groups such as phosphorus esters, sulfide ethers Stop oxidation reactions and delay aging Food Packaging, Medical Devices
Surface active agent Improve coating adhesion and enhance weather resistance Improve coating stability and indirectly reduce yellowing Building Materials, Industrial Equipment

IV. Product parameters and technical indicators of anti-yellowing agent for polyurethane water-based coatings

Choose the right anti-yellowing agent is the key to ensuring a long-lasting and bright appearance of plastic products. The following is a comparison table of technical parameters of several common anti-yellowing agents:

parameter name UV-326 (UV absorber) BHT (free radical capture agent) Irganox 1076 (antioxidants) Silane KH550 (surfactant)
Appearance White crystalline powder White crystalline powder Light yellow liquid Colorless transparent liquid
Density (g/cm³) 1.3 1.2 0.9 1.0
Thermal Stability (?) >280 >200 >200 >150
Solution Insoluble in water, easy to soluble in organic solvents Insoluble in water, slightly soluble in Easy soluble in most organic solvents It can form an emulsion with water
Recommended dosage (wt%) 0.1-0.5 0.2-0.8 0.5-1.0 0.3-0.6

As can be seen from the above table, different types of anti-yellowing agents have their own advantages, and users should choose the appropriate variety according to their actual needs.

V. Application case analysis of anti-yellowing agent for polyurethane water-based coatings

In order to better illustrate the actual effect of anti-yellowing agents, we selected several typical application scenarios for detailed analysis.

(I) Automobile interior parts

Auto interior parts (such as instrument panels, door panels, etc.) are usually made of ABS, PP and other plastics. These parts are very likely to turn yellow due to long-term high temperature environments in the car and frequent exposure to sunlight. By adding an appropriate amount of UV-326 UV absorber and Irganox 1076 antioxidant, its weather resistance and yellowing resistance can be significantly improved. Experimental data show that after the processed interior parts were tested continuously for 1000 hours under simulated sunshine conditions, the yellowing index remained at a low level.

(II) Mobile phone case

As the smartphone market competition becomes increasingly fierce, consumers have higher and higher requirements for appearance design. However, during use, the mobile phone case will inevitably be affected by sweat, oil and other pollutants, thereby accelerating yellowing. To this end, a well-known brand successfully solved this problem by using polyurethane water-based coatings containing BHT radical capture agent in its new phone case. Even after two years of use in extreme environments, the shell still maintains a good color and texture.

(III) Food Packaging Container

For the food packaging industry, safety is the primary consideration. At the same time, in order to attract consumers’ attention, packaging containers also need to have bright colors and a lasting luster. A certain enterprise has developed a polyurethane water-based coating based on Silane KH550 surfactant, which not only meets food safety standards, but also effectively prevents yellowing caused by oxidation of packaging containers.

VI. Domestic and foreign research progress and future development trends

In recent years, many breakthrough results have been achieved in the research on anti-yellowing agents of polyurethane water-based coatings. For example, DuPont, the United States, has developed a new composite anti-yellowing agent that can provide excellent protection in a variety of harsh environments; BASF, Germany, has launched a series of environmentally friendly anti-yellowing agents, further reducing production costs and improving sustainability.

Looking forward, the research and development direction of anti-yellowing agents is mainly concentrated in the following aspects:

  1. Multifunctionalization: Combining multiple functions, such as having anti-yellowing, antibacterial, flame retardant properties;
  2. Intelligent: Develop responsive anti-yellowing agents that can automatically adjust the protection strength according to environmental conditions;
  3. Green: Explore more anti-yellowing agents prepared from renewable resources to promote circulationeconomic development.

7. Conclusion: Give plastic a chance to “stay youthful”

Polyurethane water-based coating anti-yellowing agent is undoubtedly a revolutionary innovation in the plastics industry. It not only helps plastic products get rid of the problem of yellowing, but also gives them longer vitality. As an advertising slogan says: “Beautiful, start with the details.” Let us look forward to the fact that with the help of anti-yellowing agents, plastic products can shine even more dazzling!

I hope this article can meet your needs!

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The role of polyurethane water-based coating anti-yellowing agent in public facilities maintenance

3月 17th, 2025 News

Polyurethane water-based coating anti-yellowing agent: “Invisible Guardian” in public facilities maintenance

Introduction

In modern society, the maintenance and maintenance of public facilities have become an important symbol of urban development and civilization progress. Whether it is the benches in urban parks, guardrails on bridges, or the runways in school playgrounds, these facilities not only carry people’s daily life needs, but also reflect a city’s management level and humanistic care. However, over time, factors such as wind, sun, rainwater erosion and chemical pollution can cause damage to these facilities, especially the aging and discoloration of materials, which often make them look old. In this battle against time, the anti-yellowing agent of polyurethane water-based coating is like an “invisible guard” that silently protects the appearance and quality of public facilities.

What is polyurethane water-based coating anti-yellowing agent?

Polyurethane water-based coating is an environmentally friendly coating with water as a solvent, with excellent adhesion, wear resistance and weather resistance. Anti-yellowing agents are one of the key ingredients in their formulations, specifically used to prevent the coating from yellow changes due to ultraviolet irradiation or oxidation. This change not only affects aesthetics, but also may reduce the protective properties of the coating, thereby shortening the service life of the facility. Therefore, the effect of the anti-yellowing agent is crucial, which can effectively delay or even prevent this process from happening, ensuring that the coating always remains fresh and bright.

This article will deeply explore the important role of polyurethane water-based coating anti-yellowing agent in public facilities from the following aspects: first, introduce its basic principles and working mechanism; second, analyze its advantages and challenges in actual applications; then display its effects through specific cases; then summarize future development trends and put forward improvement suggestions. I hope that through the explanation of this article, readers can have a more comprehensive understanding of this seemingly ordinary but meaningful field of materials science.

Basic Principles of Anti-yellowing Agent of Polyurethane Water-Based Coatings

To understand the working mechanism of anti-yellowing agent of polyurethane water-based coatings, we need to first analyze the scientific principles behind it from the molecular level. Simply put, anti-yellowing agents are chemical substances that can absorb or shield ultraviolet rays and inhibit free radical reactions. Its main task is to protect the polymer chain in the coating from damage from external environmental factors (such as ultraviolet radiation, oxygen, moisture, etc.), thereby avoiding the coating yellowing.

The mechanism of yellowing caused by ultraviolet rays

When ultraviolet rays in the sunlight hit the surface of the coating, energy stimulates certain molecules in the coating to enter a high-energy state. If these molecules fail to release excess energy in time, a photochemical reaction may occur, resulting in a colored compound that causes the coating to turn yellow. In addition, oxygen in the air may also participate in the reaction, further exacerbating the process. This phenomenon is particularly common in traditional solvent-based coatings, but it also exists in water-based coatings, but the manifestations are slightly different.

For the rightTo combat this problem, scientists have developed a variety of types of anti-yellowing agents, among which UV Absorbers and Free Radical Scavengers are commonly used. The former can convert ultraviolet light into heat and emit it, while the latter interrupts the chain reaction by capturing and neutralizing free radicals.

Main types of anti-yellowing agents

Depending on the function and chemical structure, anti-yellowing agents can be roughly divided into the following categories:

Category Functional Features Common Representatives
Ultraviolet absorber Absorb UV rays and convert them into harmless heat Benzotriazoles, benzophenones
Free Radical Scavenger Catch and neutralize free radicals to prevent chain reactions Term amines and phenols
Antioxidant Inhibit oxidation reaction and extend coating life Phosophites, thioesters

Each type of anti-yellowing agent has its unique advantages and limitations, so it is often necessary to use in practical applications to achieve optimal results.

Advantages of application of anti-yellowing agent for polyurethane water-based coatings

Compared with traditional solvent-based coatings, polyurethane water-based coatings are highly favored in the field of public facilities maintenance due to their environmental protection characteristics and excellent performance. Anti-yellowing agents, as one of its core additives, give this paint an unparalleled competitive advantage.

Environmental

With the increase in global environmental awareness, reducing emissions of volatile organic compounds (VOCs) has become an important topic in the coatings industry. Since polyurethane water-based coatings use water as solvent, the VOC content is extremely low and meet strict environmental protection standards. At the same time, anti-yellowing agents themselves are mostly biodegradable materials and will not cause long-term pollution to the environment.

Weather resistance

Public facilities are usually exposed to complex natural environments and have been tested by wind, frost, rain and snow for a long time. Polyurethane water-based coatings can maintain stable performance under extreme conditions due to their excellent weather resistance. The presence of anti-yellowing agent further enhances the anti-aging ability of the coating, so that it can maintain its original color and luster even under strong ultraviolet rays.

Economic

Although the initial cost is slightly higher than ordinary coatings, the long-lasting durability properties of polyurethane water-based coatings make it less comprehensive throughout the life cycle. Especially forFor large public facilities, reducing maintenance frequency can not only save capital investment, but also improve management efficiency, which can be said to kill two birds with one stone.

Safety

During the construction process, water-based coatings are non-flammable, non-toxic and harmless, greatly reducing safety hazards. This is particularly important for public places, especially in densely populated areas such as schools and hospitals. Safety is always the primary consideration.

Practical application cases of anti-yellowing agent for polyurethane water-based coatings

In order to better illustrate the actual effect of the anti-yellowing agent, we selected several typical application cases for analysis.

Case 1: Wooden bench renovation project of a city park

Background: The wooden benches in the park have been exposed for a long time, and the surface coating has been severely aged, resulting in large-scale yellowing, which has affected the tourists’ experience.

Solution: Re-coat with polyurethane water-based coating containing high-efficiency anti-yellowing agent, focusing on strengthening UV protection.

Result: After a year of observation, all the refurbished benches showed no obvious signs of yellowing, and the overall appearance was completely renewed and received unanimous praise from tourists.

Case 2: Bridge anti-corrosion project in a coastal area

Background: Due to the special geographical location, the bridge is eroded by sea breeze all year round, the original coating falls off frequently, and the maintenance cost remains high.

Solution: Introduce high-performance anti-yellowing agent improved coating formula to enhance salt spray corrosion resistance and UV resistance.

Result: The new coating exhibits excellent stability and durability, with an expected service life of at least 50%.

The current situation and development prospects of domestic and foreign research

In recent years, domestic and foreign scholars have carried out a lot of research on anti-yellowing agents for polyurethane water-based coatings and have made many important progress. For example, a research team from the University of Michigan in the United States discovered a new nanoscale ultraviolet absorber with an absorption efficiency of more than 20% higher than traditional products; while researchers from Tsinghua University in my country have successfully developed a green anti-yellowing agent based on natural plant extracts, which has good biocompatibility and economicality.

Looking forward, with the continuous breakthrough of new material technology, the functions of anti-yellowing agents will be more diverse and the application scenarios will be more extensive. Especially in the fields of smart coatings, self-healing coatings, anti-yellowing agents are expected to play a greater role and create more value for human society.

Conclusion

Although polyurethane water-based coating anti-yellowing agent is inconspicuous, it is an indispensable part of the modern public facilities maintenance system. It is like a loyal guardian, silently guarding our living environment, allowing us to enjoy comfortable and convenient urban services whether in hot summer or cold winter nights. As the old saying goes, “Details determine success or failure.” It is these seemingly trivial technological advances that driveThe whole society is moving forward. Let us look forward to this amazing materials science bringing more surprises in the future!

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