Views: 0 Author: Site Editor Publish Time: 2025-02-27 Origin: Site
Two-component polyurethane adhesives are adhesives obtained by the reaction of isocyanates and hydroxyl-containing compounds, with their molecular chains containing urethane groups (-NHCOO-) or isocyanate groups (-NCO). These adhesives typically consist of two components: one is the isocyanate component (curing agent B), which contains NCO groups, and the other is the hydroxyl component (main agent A), which contains hydroxyl groups.
Two-component polyurethane adhesives have excellent bonding performance, chemical stability, and high-temperature resistance. Common applications include potting compounds, aluminum honeycomb adhesive, purification board adhesive, and waterproof coatings. CHEMXIN powder-type molecular sieve are often used in the synthesis of polyurethane materials as an additive for water removal and bubble elimination. When there is trace moisture or acidic substances in the hydroxyl component of the two-component polyurethane system, they can react with the isocyanates to produce carbon dioxide, resulting in bubbles that affect the adhesive strength of the product.
CHEMXIN activated molecular sieve powder is a type of silicoaluminate crystalline material with selective adsorption properties. They can adsorb water molecules and gas molecules, effectively removing trace moisture and other small molecular impurities from the hydroxyl component, preventing bubble formation.
In the practical application of two-component polyurethane adhesives, whether in potting, bonding, or roller coating processes, different open times after combining components A and B are required. This is especially for popular products like aluminum honeycomb panels, purification boards, and handmade polyurea products. Workers often have high demands for the open working time of adhesives. However, conventional activated molecular sieve powder materials can release heat during rapid adsorption, and as the temperature rises, the reaction rate between components A and B accelerates, thus shortening the open time.
To meet the actual application needs of customers, Guangzhou CHEMXIN Environmental Materials Co., Ltd. has launched a modified powder molecular sieve product. This product retains the high-efficiency adsorption performance while slowing down the reaction rate between components A and B, thus extending the open working time. It has been widely recognized by customers for its performance and is now stably supplied.
E: info@chemxin.com
