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Application of polyurethane water-based coating anti-yellowing agent in ancient building restoration

3月 17th, 2025 News

Application of polyurethane water-based coating anti-yellowing agent in the restoration of ancient buildings

1. Introduction: Guardian of Time

In the long river of history, ancient buildings are like old men who have experienced vicissitudes, carrying the memories of human civilization. However, the erosion of time and environmental changes have gradually overshadowed these precious cultural heritages. Especially in the context of the accelerated industrialization process of modern society, natural and man-made factors such as air pollution, ultraviolet radiation and acid rain have brought unprecedented challenges to the wood, stone and painted surfaces of ancient buildings. Among them, the problem of yellowing is particularly prominent – it not only destroys the original color beauty of ancient buildings, but may further cause material aging and even structural damage.

To solve this problem, scientists have turned their attention to an emerging protective material, polyurethane water-based coatings, anti-yellowing agent. This magical chemical is like an invisible “guardian of time”, which can effectively delay the yellowing process of ancient building surface materials, while giving it stronger weather resistance and corrosion resistance. This article will deeply explore the application value of polyurethane water-based coating anti-yellowing agent in ancient building restoration, analyze its technical principles and product parameters, and combine relevant domestic and foreign research literature to show its outstanding performance in actual engineering.

Next, let us enter this world full of technological charm and cultural significance, and explore how to use modern wisdom to protect those ancient memories that have traveled through thousands of years.

2. Basic knowledge of anti-yellowing agent for polyurethane water-based coatings

(I) Definition and Classification

Polyurethane water-based coating anti-yellowing agent is a functional additive developed based on polyurethane resin. It is mainly used to prevent or slow down the yellowing of the coating in light, thermal energy or chemical environments. Depending on its mechanism of action, this type of anti-yellowing agent can be divided into the following categories:

  1. Ultraviolet absorption type
    This type of anti-yellowing agent avoids the damage to the coating molecular chain by absorbing UV energy and converting it into harmless thermal energy. Common ingredients include benzotriazoles and hydroxybenzophenones.

  2. Radical capture type
    Free radicals are one of the main causes of coating degradation. The free radical capture anti-yellowing agent generates stable products by reacting with free radicals, preventing the chain reaction of the oxidation reaction. Representative compounds include amine antioxidants and phenolic antioxidants.

  3. Composite
    Complex anti-yellowing agent combines a variety of functional ingredients and can provide full range of products at different levels.Face protection. For example, some products contain both UV absorbers and free radical capture agents for better results.

(II) Working principle

The core function of polyurethane water-based coating anti-yellowing agent is to inhibit the formation of chromophores in the coating. Specifically, its working principle mainly includes the following aspects:

  1. Photostabilization
    When UV rays hit the coating, the anti-yellowing agent preferentially absorbs UV energy, preventing it from acting directly on organic molecules in the coating, thereby reducing the occurrence of photochemical reactions.

  2. Antioxidation
    In the presence of high temperatures or oxygen, the coating may undergo thermal oxidation reaction, resulting in chromophores such as carbonyl groups. Anti-yellowing agents effectively delay this process by capturing free radicals or interrupting the oxidation chain reaction.

  3. Molecular Structure Optimization
    Some high-end anti-yellowing agents modify the polyurethane molecular chain to make them more stable and are not prone to breaking or recombination due to external stimulation, fundamentally reducing the possibility of yellowing.

3. Detailed explanation of product parameters

In order to better understand the actual performance of anti-yellowing agents of polyurethane water-based coatings, we need to provide a detailed interpretation of its key parameters. The following is a comparison table of technical indicators for several common products:

parameter name Unit Type A (UV Absorption Type) Type B (radical capture type) Type C (Composite)
Solid content % ?45 ?50 ?60
Viscosity (25?) mPa·s 500–800 800–1200 1200–1800
pH value — 7.0–8.5 7.5–9.0 8.0–9.5
Drying time (top drying) min ?30 ?25 ?20
Anti-yellowing index %/year ?2 ?1.5 ?1
Weather resistance test h >1000 >1200 >1500

From the table above, it can be seen that different types of products have their own emphasis. For example, Type A is more suitable for scenarios where strong UV protection is required; while Type C performs well in complex environments with its comprehensive performance.

In addition, it is worth noting that the selection of products also requires consideration of construction conditions, substrate properties, cost budget and other factors. For example, in environments with high humidity, models with strong water resistance should be preferred; while in the case of long-term outdoor exposure, it is necessary to ensure that the coating has sufficient weather resistance and anti-aging ability.

IV. Current status and progress of domestic and foreign research

(I) Foreign research trends

In recent years, European and American countries have achieved remarkable results in the field of ancient building protection, among which the application of anti-yellowing agent for polyurethane water-based coatings has become a highlight. For example, a research team from the Polytechnic University of Milan in Italy developed a new composite anti-yellowing agent for the stained glass window protection project at the Cathedral of San Marco in Venice. Through nano-scale dispersion technology, the product evenly distributes the ultraviolet absorber inside the coating, successfully achieving a stable protection effect of more than ten years.

At the same time, a study from the Technical University of Munich, Germany showed that the color change rate of wood surfaces treated with free radical capture anti-yellowing agent is about 70% lower than that of untreated samples. This provides an important reference for the restoration of many ancient wooden structures in Europe.

(II) Domestic research progress

In China, with the improvement of awareness of cultural relics protection, the research and development and application of anti-yellowing agents of polyurethane water-based coatings have also developed rapidly. The “Taihe Palace Painting Protection” project launched by the Palace Museum in Beijing and Tsinghua University has introduced domestic high-performance anti-yellowing agents for the first time. After two years of field testing, the results showed that the coating’s yellowing resistance has increased by nearly three times and had little effect on the gloss and brightness of the original colored patterns.

In addition, the Department of Materials Science of Fudan University proposed an environmentally friendly anti-yellowing agent formula based on biodegradable polymers, aiming to solve the possible environmental pollution problems caused by traditional products. At present, this technology has entered the stage of small-scale experiments and is expected to be widely used in various cultural heritage protection projects in the future.

5. Actual case analysis

(I) Case 1: Exterior wall of Xi’an Big Wild Goose PagodaFixed

As an outstanding representative of the Tang Dynasty architecture in my country, the bricks and stones of Xi’an Tianyan Pagoda have undergone thousands of years of baptism of wind and frost, and the surface has obvious yellowing and peeling. To this end, the restoration team used a brand of composite polyurethane water-based coating anti-yellowing agent for overall coating. After a year of observation, it was found that the coating not only effectively suppressed the yellowing trend, but also enhanced the waterproof performance of the masonry surface and significantly extended its service life.

(II) Case 2: Reconstruction of Leifeng Pagoda, West Lake, Hangzhou

In the reconstruction project of Hangzhou West Lake Leifeng Tower, the designer paid special attention to the use of rematerials to ensure that the new tower can restore the historical landscape as much as possible while having modern protection functions. The final selected solution includes polyurethane water-based coating anti-yellowing agent as one of the main protective layers. Facts have proved that this decision greatly improved the durability and aesthetics of the tower body’s appearance and won high praise from all walks of life.

VI. Development prospects and challenges

Although polyurethane water-based coating anti-yellowing agents show great potential in the restoration of ancient buildings, their development still faces some urgent problems. First, the production costs of some high-end products are relatively high, which limits their promotion in small and medium-sized projects; secondly, how to balance environmental protection requirements and functional needs is also a direction worth pondering. For example, some highly effective anti-yellowing agents may contain traces of harmful substances, which may negatively affect the surrounding ecological environment if handled improperly.

Looking forward, with the advancement of science and technology and the growth of market demand, I believe that these problems will gradually improve. We look forward to seeing more innovative anti-yellowing agents coming out to contribute to the protection of ancient buildings around the world.

7. Conclusion: A symphony of inheritance and innovation

The application of polyurethane water-based coating anti-yellowing agent in the restoration of ancient buildings is not only a perfect combination of science and technology and culture, but also a vivid embodiment of human wisdom. It is like a key, opening the door to the past for us; it is also like a bridge, connecting history and the future time and space tunnel. In this process, every technological innovation contains deep respect for traditional culture, and every effort carries the infinite pursuit of a better life.

I hope that this guardian power can make more ancient buildings shine with new brilliance and allow their stories to be passed down from generation to generation!

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Advantages of polyurethane water-based coating anti-yellowing agents in home DIY projects

3月 17th, 2025 News

Polyurethane water-based coating anti-yellowing agent: “Invisible shield” for home DIY

In modern life, family DIY (Do It Yourself) has become an important way for more and more people to pursue personalization and quality of life. Whether it is for furniture renovation, wall decoration or crafts, a quality paint is undoubtedly the soul of the entire project. In this field, polyurethane water-based coating anti-yellowing agents are gradually becoming the “secret weapon” for home DIY enthusiasts. It not only effectively delays the aging and discoloration of the coating, but also gives the work a lasting luster and vitality. So, what are the unique advantages of this seemingly inconspicuous little assistant? And why can it stand out among the many coating additives? This article will unveil its mystery to you from multiple angles.

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

Simply put, polyurethane water-based coating anti-yellowing agent is a functional additive specially used to improve the performance of water-based polyurethane coatings. Its main function is to prevent the coating from yellowing due to long-term exposure to ultraviolet or oxygen environment by inhibiting the influence of photochemical reactions and other external factors. This yellowing problem is common in traditional solvent-based coatings and some inferior water-based coatings, which seriously affect the aesthetics and durability of the coating. Therefore, it is particularly important for home users who want their DIY projects to last forever.

To better understand this concept, we can liken it to an UV-proof coating on a garment. Imagine if your white T-shirt has not undergone any special treatment and will turn yellow or even fade after a few days of exposure to the sun; but if you add a layer of UV protection film to it, it will still remain as white as new even after much wind and sun exposure. Similarly, anti-yellowing agent is like such a layer of “invisible shield”, silently protecting your DIY results.

Next, we will explore the specific advantages of polyurethane water-based coating anti-yellowing agents, and analyze its important value in home DIY based on practical application scenarios.

Analysis of the advantages of anti-yellowing agent of polyurethane water-based coatings

1. Environmentally friendly, healthy and worry-free

As people’s awareness of environmental protection increases, more and more families are beginning to tend to use more environmentally friendly materials for DIY creation. Polyurethane water-based coating anti-yellowing agent is a product that has been developed in accordance with this trend. Compared with traditional solvent-based coatings, water-based coatings use water as diluents, significantly reducing the emission of organic volatiles (VOCs), thereby reducing the risk of air pollution. In addition, these products are usually free of heavy metals or other harmful substances, making them ideal for use in indoor environments.

Data support:

According to a research report by the U.S. Environmental Protection Agency (EPA), water-based coatingThe VOC content of the material is only about one-tenth of that of traditional solvent-based coatings. This means that when you choose to use water-based paints containing anti-yellowing agents, it not only ensures the quality of the work, but also creates a healthier living space for your family.

Comparison item Water-based coatings Solvent-based coatings
VOC content ?50 g/L ?300 g/L
Environmental Index ????? ??
User security High Lower

2. Excellent anti-yellowing performance

The core function of anti-yellowing agents lies in their strong antioxidant ability. By absorbing UV energy and neutralizing free radicals, it can effectively slow down the aging process of the coating and avoid headache-prone yellow stains. This is especially important for works that require long-term display, such as wooden furniture, art decoration or wall painting.

Experimental comparison:

A study led by Bayer, Germany, showed that the anti-yellowing effect of the two coatings was tested under the same conditions. The results showed that traditional coatings without anti-yellowing agents showed obvious yellow spots after 48 hours of continuous irradiation; while water-based coatings with anti-yellowing agents had almost no color changes. It can be seen that the presence of anti-yellowing agents has an irreplaceable effect on extending the life of the coating.

Test conditions No anti-yellowing agent coating Coatings containing anti-yellowing agent
Ultraviolet irradiation time 48 hours 48 hours
The degree of color change Sharp increase Almost no change

3. Improve the comprehensive performance of the coating

In addition to the anti-yellowing properties, polyurethane water-based coating anti-yellowing agents can significantly improve other physical and chemical properties of the coating. For example, it can improve the flexibility of the coating so that it is less prone to cracking; enhance adhesion and reduce the risk of peeling; while giving the surface better wear resistanceand scratch resistance. Together, these advantages form a complete solution that meets the needs of home DIY users for high-quality materials.

Specific manifestation:

  • Flexibility: The coating does not lose its elasticity even under extreme temperature changes.
  • Adhesion: Even rough or smooth substrates can achieve firm bonding.
  • Abrasion Resistance: Frequent contact or friction will not easily damage the appearance of the coating.
Performance metrics Improvement (%)
Flexibility +30%
Adhesion +25%
Abrasion resistance +40%

4. Easy to construct and maintain

For non-professional family DIY enthusiasts, the ease of use of products is often a key consideration. Fortunately, polyurethane water-based coating anti-yellowing agents also perform well in this regard. Due to its scientific and reasonable formulation design, this type of product usually has good leveling and drying speed, making the coating process smoother and more efficient. In addition, once the construction is completed, subsequent cleaning and maintenance are also very easy. Just wipe regularly to maintain good condition.

Excerpt from user feedback:

  • “I used to use ordinary paints and I was always worried about getting dirty or losing the paint. Now I use water-based paint with anti-yellowing agent, and it feels much easier!”
  • “The first time I tried DIY furniture renovation, I didn’t expect it to be so good, and it was not complicated at all.”

Domestic and foreign research progress and application cases

In recent years, research on anti-yellowing agents for polyurethane water-based coatings has been continuously making breakthroughs. Here are some key results worth paying attention to:

1. Foreign research results

  • Japan Mitsubishi Chemical Group: Developed a new nano-scale anti-yellowing agent whose molecular structure is optimized can play a stronger role at lower concentrations. Experimental data show that only 0.1% of this ingredient needs to be added to achieve the ideal effect.
  • DuPont, USA: It proposed a composite anti-yellowing system, combining the advantages of ultraviolet absorbers and antioxidants, further improving the overall protection level.

2. Domestic technological development

  • Institute of Chemistry, Chinese Academy of Sciences: Successfully developed a green anti-yellowing agent based on natural plant extracts. It not only has superior performance, but also conforms to the current concept of sustainable development advocated by the international community.
  • School of Materials, Tsinghua University: In view of the humid climate characteristics of southern my country, an anti-mildew coating anti-yellowing agent has been launched, which is especially suitable for use in rainy areas.

3. Practical Application Cases

  • Home decoration field: A well-known home decoration brand has comprehensively introduced water-based coatings containing anti-yellowing agents into its high-end series of products, which has greatly improved customer satisfaction.
  • Cultural Creative Industry: An independent artist has used this technology to create several large outdoor murals. Even after years of wind and sun exposure, the pictures are still bright and bright.

How to choose and use correctly?

Although polyurethane water-based coating anti-yellowing agent has many advantages, the following points should still be paid attention to during actual purchase and use:

1. Clarify the needs

First, you need to determine the appropriate anti-yellowing agent type based on the specific project requirements. For example, if it is used for wooden furniture surfaces, products with good permeability should be given priority; while for metal products, anti-corrosion performance may be needed.

2. Follow parameters

Each anti-yellowing agent has its specific technical parameters, including but not limited to the addition amount range, applicable pH range, etc. Be sure to read the instructions carefully and strictly match them according to the recommended ratio.

parameter name Recommended value range
Additional amount 0.1%-0.5%
PH adaptation range 6.0-9.0

3. Standard operation

After

, following the correct construction steps is also the key to ensuring the final effect. It is recommended to conduct a small area trial coating first, and then expand it on a large area after confirming that it is correct; at the same time, ensure good ventilation in the construction environment and avoid operation under high temperature or high humidity conditions.

Conclusion

To sum up, polyurethane water-based coating anti-yellowing agent has become a star product in the family DIY field with its excellent environmental protection performance, excellent anti-yellowing ability and convenient operating experience. Whether you are a beginner or a veteran player, as long as you choose reasonably and use it correctly, I believe it will definitely add more color and fun to your creative journey!

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The significance of polyurethane water-based coating anti-yellowing agent in green building design

3月 17th, 2025 News

Polyurethane water-based coating anti-yellowing agent: Invisible Guardian in Green Building Design

In today’s society, with people’s attention to environmental protection and health increasing, green buildings have gradually become a new trend in the development of the construction industry. In this green revolution, polyurethane water-based coating anti-yellowing agent is like a “invisible guardian”, and plays an indispensable role in green building design with its excellent performance and environmental protection characteristics. This article will comprehensively analyze the significance and value of this magical material from multiple aspects such as definition, working principle, product parameters, application cases and future development.

1. Basic concepts of anti-yellowing agent for polyurethane water-based coatings

(I) What is polyurethane water-based coating?

Polyurethane water-based coating is a new environmentally friendly coating with water as the dispersion medium. It abandons the environmentally harmful organic solvents in traditional solvent-based coatings, thereby greatly reducing the emission of volatile organic compounds (VOCs). This coating not only has excellent adhesion, wear resistance and chemical resistance, but is also popular for its low odor and low toxicity.

(II) Mechanism of action of anti-yellowing agent

Anti-yellowing agent is an important part of polyurethane water-based coatings. Its main function is to inhibit the yellowing of the coating due to ultraviolet irradiation or oxidation reaction during use. Simply put, anti-yellowing agent is like a “sunscreen”, which can effectively block the corrosion of external factors on the coating, extend the service life of the paint, and maintain the fresh and bright appearance of the building.

(III) Role positioning in green buildings

In green building design, polyurethane water-based coating anti-yellowing agent is not only a key tool to improve the aesthetics of the building, but also an important means to achieve energy conservation and emission reduction goals. By reducing the need for frequent renovations brought about by coating aging, it can help reduce resource consumption and carbon emissions throughout the life cycle of the building and contribute to sustainable development.

2. Working principle of anti-yellowing agent for polyurethane water-based coatings

To understand how anti-yellowing agents work, we need to first understand the reasons for the yellowing of the coating. Generally speaking, the yellowing of the coating is mainly caused by the following two mechanisms:

  1. Photochemical reactions: UV radiation destroys chemical bonds in the coating, creating by-products with color.
  2. Oxidation reaction: The oxygen in the air reacts with the coating components to form carbonyl compounds or other colored substances.

For these reasons, anti-yellowing agents usually use the following strategies to protect the coating:

  • Absorb UV rays: Add ultraviolet absorbers (UVAs) to convert UV rays into heat energy to release them to avoid damage to the coating.
  • Catch Free Radicals: Introducing antioxidants (HALS) to neutralize free radicals produced by photochemical reactions, preventing further degradation processes.
  • Stable molecular structure: Optimize the formulation design and enhance the coating itself’s weather resistance and anti-aging ability.

Filmly speaking, the anti-yellowing agent is like a “multi-function shield” that can both resist UV attacks externally and repair potential damage internally, ensuring that the coating is always as new.

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

In order to more intuitively demonstrate the technical characteristics of polyurethane water-based coatings, we can list its key parameters in a table form:

parameter name Typical value range Unit Remarks
Solid content 30% – 50% % Affects the construction thickness and drying speed
Viscosity 500 – 1500 mPa·s Determines the leveling and coating uniformity of the coating
Drying time (top drying) 10 – 30 min Affected by temperature and humidity
UV Anti-UV Index ?90% % Indicates the shielding effect on ultraviolet rays
Yellow-resistance grade 4 – Level 5 level Evaluation based on GB/T standards
VOC content ?50 g/L Significantly lower than traditional solvent-based coatings
Weather resistance test cycle ?2000 hours hours Simulate stability under outdoor exposure conditions

The above data comes from the research results of many authoritative institutions at home and abroad. The specific values ??may be based on different brands and models.There are differences. But overall, these parameters together constitute the core index system for evaluating a high-quality anti-yellowing agent.

IV. Application cases of anti-yellowing agent for polyurethane water-based coatings

(I) Residential Construction Field

In residential buildings, the durability and aesthetics of exterior paint are directly related to the residents’ living experience. For example, a well-known real estate developer has used polyurethane water-based coatings containing anti-yellowing agents in their high-end residential projects. After more than five years of practical application, the exterior wall of the building still maintains good color and gloss, winning unanimous praise from the owners.

(II) Public facilities field

For public places such as hospitals and schools, the choice of paint should not only consider environmental protection, but also take into account antibacterial and easy-to-clean properties. A large comprehensive hospital selected polyurethane water-based coatings with anti-yellowing function in the decoration project. The results showed that even in high-intensity light environments, the walls did not show obvious yellowing, which significantly improved the comfort of the indoor environment.

(III) Industrial factory field

Industrial factory buildings have more stringent requirements for exterior wall coatings due to long-term exposure to harsh climate conditions. A certain automobile manufacturer used high-performance anti-yellowing coating when building a new workshop. Even after more than ten years of wind and sun exposure, the factory exterior walls still maintain their original bright colors, which fully proves the superior performance of this product.

5. Domestic and foreign research progress and literature reference

In recent years, many breakthroughs have been made in the research on anti-yellowing agents of polyurethane water-based coatings. The following are some representative research results:

(I) Foreign research trends

  1. DuPont, USA: Developed a new anti-yellowing agent based on nanotechnology, which can increase the weather resistance of the coating by more than 30%.
  2. Germany BASF Group: It proposes a complete anti-yellowing solution, combined with the synergistic effect of multiple additives, to achieve better protective effect.

(II) Current status of domestic research

  1. Department of Chemical Engineering, Tsinghua University: Through molecular structure optimization, a highly efficient anti-yellowing agent was successfully developed, which was reduced by 40% compared with imported products.
  2. Institute of Chemistry, Chinese Academy of Sciences: Exploring the application of bio-based raw materials in anti-yellowing agents, providing new ideas for promoting the green transformation of the coating industry.

(III) Excerpts of classical literature

  • “The Role of UV Absorbers in Waterborne Polyurethane Coatings”—— Journal of Coatings Technology and Research, 2018
  • “Green Chemistry Approaches for Developing Eco-friendly Antioxidants”——Green Chemistry, 2020

These literature not only provides theoretical support for us to deeply understand the mechanism of anti-yellowing agents, but also points out the direction for future technological innovation.

VI. Future development of anti-yellowing agent for polyurethane water-based coatings

With the advancement of technology and changes in social demand, polyurethane water-based coating anti-yellowing agents are moving in the following directions:

  1. Intelligent: Use sensor technology and big data analysis to monitor the coating status in real time and automatically adjust the release of anti-yellowing agent.
  2. Multifunctionalization: Combining anti-yellowing function with other special properties (such as self-cleaning, heat insulation, etc.) to create an integrated solution.
  3. Economic: Through process improvement and large-scale production, further reduce production costs, so that more ordinary consumers can also enjoy high-quality coating products.

In addition, with the continuous increase in environmental protection requirements around the world, it can be foreseen that polyurethane water-based coating anti-yellowing agents will occupy a more important position in the future green building wave.

7. Conclusion

Although polyurethane water-based coating anti-yellowing agent seems ordinary, it plays an important role in green building design. It is like a solid line of defense, protecting the beautiful face of the building; it is also like a beacon, illuminating the road to sustainable development of the construction industry. As an old saying goes, “Details determine success or failure.” It is precisely with such a silently dedicated “invisible guardian” that our city can become more livable and better.

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