During production and use, two-component polyurethane is easily affected by moisture, resulting in bubbles and affecting product performance. The effect of moisture on two-component polyurethane adhesive as follows:
- Bubble generation: Isocyanates react with water to produce carbon dioxide, forming bubbles in the adhesive layer, affecting the product's appearance and performance.
- Reduce Bonding Strength: Moisture consumes isocyanate groups, leading to incomplete curing, decreased crosslinking density, and weakened adhesion.
- Reduced reaction rate: Moisture reacts with the isocyanate components, reducing the content of the effective components and affecting the curing speed.
- Decreased storage stability: Adhesives absorb moisture during storage, which can lead to premature reaction, causing viscosity increases or gelation, shortening the shelf life.
Why Choose PM Activated Molecular Sieve Powder?
PM activated molecular sieve powder can effectively adsorb molecules, carbon dioxide molecules, and hydrogen sulfide molecules in polyurethane components, thereby reducing moisture, eliminating bubbles, removing odor, improving curing effect, increasing strength and extending service life. The type of activated molecular sieve powder includes 3A, 4A, 5A, 13X, modified activated molecular sieve powder.
Polyurethane Adhesives Systems
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