How to use polyurethane glue to enhance the durability of building sealant

Date：2025-03-15 Categories：Our Projects

Polyurethane glue yellowing agent: Make construction sealant last as long as new

In the construction industry, sealants are an indispensable “hero behind the scenes”. Whether it is a tall building or a family house, sealant silently undertakes important tasks of waterproofing, dustproofing and sound insulation. However, over time, ordinary sealants may experience problems such as aging and yellowing, affecting the aesthetics and performance of the building. The polyurethane glue yellowing agent is like an invisible guardian, injecting stronger vitality and longer-lasting brilliance into the building sealant.

What is polyurethane glue yellowing resistant agent?

To understand the role of polyurethane glue with yellowing resistance, we must first understand its “protagonist” – polyurethane glue. Polyurethane glue is a high-performance adhesive material that is widely used in construction, automobile, furniture and other fields. It has excellent bonding strength, flexibility and chemical resistance, but it also has a small disadvantage: it is prone to yellowing due to ultraviolet irradiation or oxidation, which affects the appearance and service life.

At this time, the yellowing agent will appear! Yellowing resistance agent is a special additive that can effectively inhibit the breakage and oxidation reaction of molecular chains in polyurethane glue and delay the occurrence of yellowing. Simply put, it is like applying a layer of “sunscreen” to polyurethane glue, allowing it to remain fresh and bright in the sun.

The working principle of yellowing agent

In order to better understand the mechanism of action of yellowing agents, we need to go deep into the molecular level to find out. The yellowing in polyurethane glue is mainly caused by free radical reactions caused by ultraviolet rays and oxygen. These free radicals attack the polyurethane molecular chain, causing it to decompose and form colored substances, eventually turning the colloid yellow.

Yellow-resistant agents prevent this process in the following ways:

Absorb UV rays: Some yellowing agents can absorb UV energy and convert it into harmless heat energy to release it, thereby avoiding the direct damage of UV rays to polyurethane molecules.
Scavenge free radicals: Another type of yellowing agent acts as an antioxidant, actively capturing and neutralizing free radicals to prevent them from further damaging the molecular structure.
Stable molecular structure: There are also some yellowing agents that enhance the stability of the polyurethane molecular chain and improve their anti-aging ability.

Advantages of application of polyurethane glue yellowing agent

Adding yellowing agent to polyurethane glue can not only make the product look more beautiful, but also significantly improve its performance and life. The following are the specific advantages:

Extend service life: Polyurethane glue that has been treated with yellowing can maintain stable performance for a longer period of time in harsh environments.
Improving appearance quality: Reducing yellowing means maintaining the original color and transparency of the product, which is particularly important for application scenarios that require high transparency.
Enhance market competitiveness: High-quality yellow-resistant polyurethane glue can meet customers’ long-term stability needs and help manufacturers win more market share.

Comparison of main types and parameters in the market

The common polyurethane glue yellowing agents on the market currently include UV Absorbers, antioxidants and light stabilizers. Below we will use a table to compare the characteristics and typical application areas of these three types of products in detail.

Category	Main Ingredients	Function Description	Typical Application Areas
Ultraviolet absorber	Benzotriazole compounds	Absorbs ultraviolet rays and converts them into thermal energy	Outdoor building materials
Antioxidants	Stealed phenolic compounds	Catch free radicals to prevent oxidation	Interior Decoration Materials
Light Stabilizer	Trumped amine compounds	Providing comprehensive light protection	High-end automotive painting

It can be seen from the table that different types of yellowing agents are suitable for different application scenarios. For example, outdoor building sealants usually choose UV absorbers because they can effectively resist strong solar radiation; while for indoor environments, antioxidants may be more inclined to use because the light conditions here are relatively mild but the risk of oxidation is higher.

Progress in domestic and foreign research

In recent years, domestic and foreign scholars have conducted a lot of research on the yellowing resistance technology of polyurethane glue. DuPont has developed a new composite yellowing agent that combines the dual functions of ultraviolet absorption and antioxidant, significantly improving the comprehensive performance of the product. In China, the research team at Tsinghua University proposed a yellowing resistance solution based on nanotechnology, which enhances the overall stability of the material by introducing nanoparticles between polyurethane molecules.

In addition, a study by BASF in Germany showed that by optimizing the dispersion process of yellowing agents, it can be greatly improved in polyurethaneThe degree of uniform distribution in the substrate thereby improving the overall effect. This discovery provides important theoretical support for industrialized production.

Practical Case Analysis

In order to more intuitively demonstrate the actual effect of yellowing agents, we can take a look at several successful cases. During the renovation process, a large shopping center used polyurethane sealant with yellowing agent added to install glass curtain walls. Two years later, a follow-up visit was found that the sealant still maintained good transparency and elasticity, and there were no obvious signs of aging. In contrast, traditional sealants without yellowing agents have already shown obvious yellow spots under the same conditions, which seriously affects the overall aesthetics of the building.

Another example comes from the automotive industry. A well-known car company has introduced polyurethane glue containing efficient yellowing agents into the window seals of its new model. The results show that even after several years of sun and rain, these sealing strips still maintain their original color and performance, which has been highly praised by consumers.

Conclusion

In short, polyurethane glue yellowing agent is not only a key technology to improve the performance of building sealant, but also an important driving force for the development of the entire industry. Through scientific selection and rational use of yellowing agents, we can not only solve the shortcomings of traditional products, but also create more high-end materials that meet modern needs. In the future, with the continuous emergence of new materials and new technologies, I believe that research in the field of yellowing resistance of polyurethane glue will make greater breakthroughs and bring more exciting changes to our lives.

Tags：How to use polyurethane glue to enhance the durability of building sealant

Prev： Exploring the application cases of polyurethane glue yellowing agent in automobile manufacturing
Next： Polyurethane glue yellowing agent: a secret weapon to improve the durability of outdoor billboards