Preparation method for moisture-curing polyurethane reactive hot-melt adhesives for textile compositions.

摘要

(1) mixing and stirring the polyether polyol 4000E, polyester polyol 3000H, polyester polyol 2000N and an antioxidant, heating the mixture to about 120 ° C, and dehydrating for 0.5 hours under a vacuum of less than 100 Pa; (2) adding a tackifying resin, heating the mixture to 135-140 ° C and dehydrating for 1.5 hours under a vacuum of less than 100 Pa; (3) lowering the temperature to 87 ° C, adding 4,4'-diphenylmethane diisocyanate and a catalyst, stirring the mixture and reacting for 2 hours under a vacuum of less than 100 Pa; (4) removal of the vacuum, adding of white carbon, rapid stirring of the mixture until homogeneity is achieved, and further stirring for 10 minutes under a vacuum of less than 100 Pa; And (5) rapid unloading at a temperature of 85-100 ° C, packing and then curing for 4 hours at 80-85 ° C to obtain the target product. When used in textile lamination, the product has excellent peel strength, a relatively short opening time, good resistance to hydrolysis and desirable storage stability.