the application of PU varnish defoamer

PU varnish defoamer has a wide range of applications in the coating industry, especially in dealing with the foam problem generated by PU varnish (including PU acrylic varnish, PU alkyd varnish, etc.). The following is a detailed analysis of the application of PU varnish defoamer:

1. The role of PU varnish defoamer

PU varnish defoamer is an additive specially designed to eliminate the foam generated by PU varnish during production and application. It can effectively destroy the stability of the foam, make the foam break and dissipate quickly, thereby improving the quality and production efficiency of the product.

2. Specific application

Paint production:

During the production process of PU varnish, a large amount of foam is often generated due to chemical reactions, stirring, shearing and other factors. These foams will affect the leveling, gloss and uniformity of the coating, and then affect the appearance and quality of the final product.

By adding an appropriate amount of PU varnish defoamer, the generation of foam can be effectively controlled and the stability and quality of the coating can be improved.

Paint construction:

During the coating construction process, such as spraying, brushing, etc., foam will also be formed due to the mixing of air into the coating. These foams will affect the construction effect of the coating and the performance of the final product.

Using PU varnish defoamer can effectively eliminate these bubbles, make the coating more uniform and smooth, and improve the beauty and durability of the product.

3. Performance characteristics

High efficiency: PU varnish defoamer can quickly eliminate bubbles in various systems and is not easy to rebound.

Good compatibility: It has good compatibility with PU varnish and is not easy to produce defects such as shrinkage holes and fish eyes.

Good stability: It has good chemical stability and thermal stability, and can maintain a stable defoaming effect under different temperature and humidity conditions.

Environmental protection: It meets environmental protection requirements, is non-toxic and harmless, and will not pollute the environment.

4. Selection and application suggestions

Choose a suitable defoamer: According to the specific type and construction conditions of PU varnish, choose the appropriate defoamer model and dosage. Different defoamers have different performance and application ranges, so they need to be tested and evaluated.

Correct use of defoamer: When using a defoamer, follow the instructions in the product manual to ensure that the defoamer can fully exert its defoaming effect. At the same time, attention should be paid to the timing and method of adding the defoamer to avoid affecting the performance and construction effect of the coating.

Pay attention to storage conditions: PU varnish defoamer should be stored in a cool, dry, well-ventilated place, avoiding direct sunlight and high temperature. At the same time, attention should be paid to maintaining the sealing of the container to prevent the defoamer from volatilizing and deteriorating.

In summary, PU varnish defoamer has broad application prospects and important value in the coating industry. Through the reasonable use of defoamer, the quality and construction effect of the coating can be effectively improved, making positive contributions to the development of the coating industry.