In the production processes of polyurethane adhesives, coatings, sealants, and electronic potting materials, trace amounts of moisture can cause bubbles, uneven dispersion, decreased adhesion, abnormal curing, and filter clogging.
Activated Molecular Sieve Powder
Activated molecular sieve powder, as highly efficient physical adsorbents, has become the industry standard for defoaming and water removal. However, when facing different adhesive systems, process conditions, and impurity compositions, selecting the right model is more important than blindly pursuing “high adsorption capacity.”
Based on over twenty years of experience in adsorption material R&D and global customer service, Xintao has developed a “precise matching based on system” logic for selecting powder molecular sieve.
How to Choose the Right Molecular Sieve Powder?
- 3A Molecular Sieve Powder: Xintao 3A molecular sieve powder, also known as potassium-based molecular sieve powder, has a static water adsorption value exceeding 23%, offering dedicated deep water removal. Suitable for two-component polyurethane adhesives and polyurea systems, they are the preferred choice and a long-term repeat purchase by overseas customers!
- 4A Molecular Sieve Powder: 4A zeolite powder, also known as sodium-based molecular sieve powder. Its static water adsorption capacity exceeds 24%, making it widely applicable and vacuum-resistant. It can adsorb water, CO2, and some polar small molecules, suitable for most common general-purpose adhesives, coatings, paints, and floor coatings.
- 5A Molecular Sieve Powder: 5A molecular sieve powder, also known as calcium-based powder molecular sieve, has a static water adsorption capacity exceeding 25%. It features high adsorption, low additive requirements, and rapid dehydration, making it particularly suitable for polyurethane adhesive systems with high raw material moisture content.
- 13X Molecular Sieve Powder: 13X molecular sieve powder, also known as sodium X powder molecular sieve, has a static water adsorption value reaching 27%. It features a wide pore size, strong adsorption capacity, simultaneous water and impurity removal, and can also adsorb waste gas, making it suitable for complex adhesive systems.
- Modified Molecular Sieve Powder: Xintao modified molecular sieve powder is a water-removing zeolite powder we developed specifically for the polyurethane industry. While conventional powder zeolite molecular sieve has a pH of 9-11, modified zeolite powder is low-alkaline (pH 7-11), which can extend the curing time and precisely adapt to applications such as coatings and electronic potting compounds.
Choosing the right powder molecular sieve allows for clear classification and precise solutions to the challenges of polyurethane adhesive production. We offer free samples for testing; please contact the Xintao technical team for customized selection solutions.
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