Efficient Application of 3A Molecular Sieve Activated Powder

In the production of polyurethane adhesives, removal of moisture and air bubbles is crucial to ensuring product performance. Moisture reacts with isocyanates to generate carbon dioxide gas, which can cause pinholes and bubbles in the coating. Meanwhile, mechanically introduced bubbles during mixing affect leveling properties and bonding strength.

3A Molecular Sieve Activated Powder: Precise Dehydration, Efficient Defoaming

3A molecular sieve activated powder is a specialized, fine-particle material used for moisture removal. With its unique pore size of 3 Å, it selectively adsorbs water molecules (approximately 2.6 Å in diameter) while allowing other organic molecules to pass through, maintaining the integrity of the polyurethane system. As a physical adsorption-type defoaming agent, it demonstrates outstanding performance:

High Moisture Removal Efficiency: At 35°C and 75% relative humidity, static water adsorption can reach over 23 wt%.

Ultra-Fine Particle Design: CHEMXIN 3A activated molecular sieve powder features a particle size refined to 2 μm and a bulk density of approximately 0.45 g/ml, offering excellent dispersibility and anti-settling properties.

Superior Compatibility: Chemically modified surfaces enhance polarity, allowing hydrogen bonding with the polyurethane matrix for stable, long-term water removal

Remarkable Performance in Practical Applications

In applications such as polyurethane potting compounds, adding 3%–5% of 3A molecular sieve activated powder can significantly improve system quality:

Moisture content reduced from 0.15% to below 0.02%

Foam height reduced by 75%

No secondary foaming observed within 48 hours

The final product can achieve bubble size below 50 μm and moisture content below 0.02%, meeting the stringent requirements of high-end applications such as automotive interiors and electronic encapsulation.

Outlook: Enhancing Polyurethane Performance Through Technological Innovation

With ongoing advancements in surface modification of molecular sieves and continuous innovation in defoamer formulations, the application of 3A molecular sieve activated powder will unlock greater value in the polyurethane industry—reducing energy consumption, improving yield rates, and enhancing product reliability.

If you have any needs or questions, please feel free to contact us at any time.

E: info@chemxin.com

www.chemxin.com