In the production and application of polyurethane adhesives, trace amounts of moisture often lead to product defects. Moisture reacts with isocyanate groups, producing carbon dioxide gas, which can cause bubbles during the curing process, severely impacting the adhesive's appearance, bond strength, and service life. Activated molecular sieve powder offers an efficient and reliable solution to this problem.
Product Description:
Powder molecular sieves are a white powder that undergoes high-temperature activation and dehydration. They possess a uniform nanopore structure with pores ranging from 2 to 4 microns. They are highly active and can be used directly as a selective adsorbent in polyurethane production. Packing Mall offers a variety of powdered molecular sieves, including 3A molecular sieve powder, 4A molecular sieve powder, 5A molecular sieve powder, 13X molecular sieve powder and modified powder molecular sieve. They offer excellent water absorption properties, with static water adsorption values reaching 23%-27%. Through selective adsorption, they fundamentally eliminate the source of carbon dioxide generated by the reaction of water with isocyanate, effectively preventing the formation of bubbles.
Core Advantages:
Efficient Moisture Removal: Molecular sieve powder has a high specific surface area and rich microporous structure, enabling rapid reduction of moisture content in polyether polyols.
Eliminating Bubbles: By removing moisture, it blocks the reaction between water and isocyanate to produce CO₂, thereby inhibiting bubble formation.
Extending Product Cure Time: Prolonging the workable time, enabling smoother application and more stable and superior product performance.
Improving Product Performance: By eliminating bubbles, it significantly improves the density, transparency, and bond strength of the adhesive layer, while also enhancing the appearance.
As a highly efficient adsorption desiccant, molecular sieve activated powder fundamentally resolves the moisture-induced foaming problem in polyurethane adhesives through its precise molecular sieving capabilities and deep drying properties. It is a key additive for enhancing product quality and reliability.
