Preparation method of adhesive for shoes

Abstract

The invention relates to a method for making an adhesive for shoes, which mainly uses polyester polyol with a large molecular weight as the main raw material, and combines toluene diisocyanate and hexamethylene diisocyanate for pre-polymerization. After the reaction is completed to a predetermined degree, directly Cool down and react with diaminosulfonate, and quickly react with ethylenediamine to extend the chain before emulsification in ice water, and then add ice water for emulsification. By adjusting the amount of ethylenediamine, the remaining isocyanate is passed through monoethanolamine at room temperature Termination reaction is carried out during the curing process; sulfamate is used as an emulsifier, and a combination of toluene diisocyanate and hexamethylene diisocyanate is used; it has low cost, high production efficiency, good controllability of production process, and high production yield. advantage.

Description

technical field [0001] The invention belongs to the field of polymer materials, in particular to a water-based polyurethane adhesive and a preparation method. The invention is suitable for adhesives for shoes. Background technique [0002] my country is the world's largest producer, consumer and exporter of footwear, with an annual output of billions of pairs of footwear, accounting for more than 50% of the world's total footwear production. Zhejiang, Fujian, Guangdong, Shandong, Sichuan, Chengdu and other provinces have become the concentration places of the shoemaking industry, with more than 20,000 enterprises concentrated. 80% of the shoes produced need to use adhesives, and the amount of shoe glue used exceeds 200,000 tons . Shoe adhesives start from the first generation of neoprene adhesives, the second generation of grafted adhesives, the third generation of solvent-based polyurethane adhesives, and are now developing towards the fourth generation of water-based pol...

AI Technical Summary

Problems solved by technology

Its main disadvantage is that the viscosity of sodium 2-[(2-aminoethyl)amino]ethanesulfonate reacts with the chain-extended molecular chain of 1,4-butanediol to increase rapidly, and a large amount of acetone needs to be added to dilute it. , otherwise it will lead to emulsification failure, and the acetone added accounts for about 1.5-1.8 times of the polymer, which leads to the problem of acetone recovery and feeding cost; moreover, each batch of production can only produce about half of the feeding amount. , the rest are solvents such as methyl ethyl ketone and acetone removed by vacuuming, which brings great trouble to production and is also the main factor of low production efficiency; chain extension reaction under high viscosity is essential for the operation process of industrial production process The requirements are extremely high. If it is not well controlled, it will easily lead to problems such as emulsification failure or weakening or failure of the initial viscosity of the adhesive, resulting in low yield