Low-density pouring sealant and preparation method thereof

• Main Authors: DU SHUAIPENG, ZHANG YONG, LU YUCHONG, WANG JIANBIN, GUO ZHENG, MA YUMIN, SUN XIAOKANG, LI YAO, TAO XINLIANG, WANG KE, HONG CONGZHE, CAI YAOWU, FAN RUOBIN
• Format: Patent
• Language: Chinese; English
• Published: 10.03.2023
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS AS ADHESIVES

The invention provides a preparation method of a low-density pouring sealant, which comprises the following steps: a) dehydrating trifunctional polyether and bifunctional polyether, cooling to 70-80 DEG C, adding isocyanate to react for 1-2 hours under the protection of nitrogen and stirring conditions, adding a catalyst to continue to react for 1-2 hours, then adding micromolecules containing hydroxyl and vinyl, continuing to react for 2-3 hours, cooling to 70-80 DEG C, adding a catalyst to react for 1-2 hours under the protection of nitrogen and stirring conditions, and cooling to 70-80 DEG C; a vinyl terminated polyurethane prepolymer is obtained; b) uniformly mixing the vinyl-terminated polyurethane prepolymer obtained in the step a) with calcium carbonate, glass beads and a vinyl silane coupling agent to obtain a component A; uniformly mixing hydrogen-containing silicone oil and a platinum catalyst to obtain a component B; the component A and the component B are mixed according to the mass ratio of 100: