Preparation method for silane-modified moisture-curable polyurethane hot melt adhesive

Abstract

The invention discloses a preparation method for a silane-modified moisture-curable polyurethane hot melt adhesive. The method comprises the following steps: (1) heating and mixing polyester polyol, polyether polyol, tackifying resin, an antioxidant and a fluorescent whitening agent at a certain temperature, performing reduced pressure degassing for 2 hours, and cooling to 90 DEG C; (2) adding isocyanate and a catalyst into a reaction system under the nitrogen protection, and reacting at 85-95 DEG C for 45 minutes; (3) adding a chain extender and a silane coupler under the nitrogen protection, and reacting at 85-95 DEG C for 1 hour to obtain a prepolymer; (4) transferring a reaction mixture into an aluminum foil bag under the nitrogen protection, sealing, and curing at 85 DEG C for 6 hours to obtain the silane-modified moisture-curable polyurethane hot melt adhesive with excellent performance.

Description

technical field

[0001] The invention relates to a preparation method of a silane-modified moisture-curing polyurethane hot-melt adhesive, which is used to improve the poor wettability of conventional moisture-curing polyurethane hot-melt adhesives to substrates with low surface energy and chemically treated waterproof fabrics, resulting in adhesion effects bad question. Background technique

[0002] Polyurethane hot melt adhesive has 100% solid content, does not discharge solvents into the environment, has no pollution to the environment, and is non-toxic to the human body. It is a green and environmentally friendly adhesive that meets the three requirements of "environmental protection, health, and safety" and has no drying Process, less energy consumption, easy operation, can be used in high-speed continuous production lines, improve production efficiency and a series of incomparable advantages, becoming an increasingly important type of adhesive in the field of adhesives....

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