Abstract: In the production and application process of two-component polyurethane, bubbles are often due to the influence of moisture, which affects product quality. This article will introduce a new solution – powder molecular sieve developed and produced by Pingxiang Zhongci for 10years. And explore its unique advantages and application prospects in removing moisture and eliminating bubbles from two-component polyurethane.

1、 Moisture problem and impact of two-component polyurethane

The two-component polyurethane is of component A (isocyanate component) and component B (polyol component). It has good wear resistance, chemical resistance, adhesion and other excellent properties, and is widely used in coatings, adhesives, foam and other fields. However, during production and use, two-component polyurethane is easily affect by moisture. It causes the formation of bubbles and affecting product performance.
The influence of moisture on two-component polyurethane is mainly reflected in the following aspects:

1. Decreased reaction rate: Moisture reacts with isocyanate components, reducing the effective component content and affecting the curing rate.
2. Hardness reduction: Moisture participates in the curing reaction, resulting in lower hardness of the product and affecting its performance.
3. Generating bubbles: Water reacts with isocyanate components to produce carbon dioxide gas, forming bubbles that affect the appearance and performance of the product.
4. Reduce bonding strength: Moisture affects the bonding performance of two-component polyurethane, reducing bonding strength.
   2、 Principles and Applications of Powder Molecular Sieves
   Powder molecular sieve is an adsorbent with microporous structure and high specific surface area. This can effectively adsorb and remove impurities such as water and gas. Pingxiang Zhongci has been on the research and production of powder molecular sieves for 10 years. Thus, we provide a new solution for moisture elimination and bubble suppression in two-component polyurethane.
5. Principle
   The principle of powder molecular sieve to remove moisture from two-component polyurethane is mainly base on the following aspects:
   (1) Physical adsorption: Molecular sieves have rich microporous structures, and water molecules are adsorb in the pores.
   (2) Chemical adsorption: The silanol groups on the surface of the molecular sieve form hydrogen bonds with water molecules, enhancing the adsorption effect.
   (3) Selective adsorption: Molecular sieves have a high selective adsorption capacity for water. This can effectively remove water without affecting other properties of two-component polyurethane.
6. Application
   (1) In the production process of two-component polyurethane, adding powdered molecular sieves to component A or component B can effectively remove moisture and improve product quality.
   (2) During application: Before construction, adding powdered molecular sieves to two-component polyurethane can eliminate bubbles and improve product appearance and performance.
   (3) During storage: When storing two-component polyurethane, adding powdered molecular sieves can prevent moisture from entering and ensure product quality.
   3、 Advantages of Powder Molecular Sieve
7. Efficient removal of moisture: Powder molecular sieves have a high specific surface area and rich microporous structure. So this can efficiently remove moisture from two-component polyurethane.
8. Inhibit bubble generation: Molecular sieves can adsorb water, reduce the generation of carbon dioxide gas, and thus reduce bubble generation.
9. Improve product quality: remove moisture and bubbles, improve the curing speed, hardness, bonding strength and other properties of two-component polyurethane.
10. Environmentally friendly and pollution-free: Powder molecular sieves are physically adsorbed, have no chemical reactions. Moreover, they are environmentally friendly.
11. Easy to operate: Powder molecular sieve is easy to use, just add it to two-component polyurethane in a certain proportion.
    4、 Conclusion
    As a new type of adsorbent, powder molecular sieve has significant advantages in removing moisture and eliminating bubbles from two-component polyurethane. Pingxiang Zhongci has 10 years of experience in the research and production of powder molecular sieves, providing efficient, environmentally friendly, and economical solutions for the two-component polyurethane industry. Therefore, I believe that with the widespread application of powder molecular sieves in the field of two-component polyurethane. Moreover, it will strongly promote the development and innovation of the industry.

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