Polyurethane adhesive and preparation method thereof

Abstract

The invention provides a polyurethane adhesive and a preparation method thereof. The polyurethane adhesive is prepared from the following components in percentage by mass: 1.6 to 11.4 percent of hydroxyl polyurethane elastomer, 0 to 3.5 percent of flexibilizer, 0 to 2.8 percent of polymer modifier, 0.1 to 2.8 percent of reinforcing agent, 0 to 1.5 percent of aid and 88 to 97 percent of organic solvent. The adhesive has the advantages of low solid content, good rework ability, high initial viscosity, high peel strength, high shearing strength, good wettability and low cost of a substrate and the like; in addition, the adhesive has good high-temperature washing resistance, bending resistance and heat-resisting aging when being used for adhering shoe soles to vamps. The invention also provides the preparation method of the polyurethane adhesive; the preparation method comprises the steps of preparing polyurethane elastomer masterbatch, dissolving and the like; the process is simple.

Description

technical field [0001] The invention belongs to the field of adhesives, and in particular relates to a high-performance adhesive for shoes and a preparation method thereof. Background technique [0002] my country is the largest shoe-making country in the world. Since the reform and opening up, China's shoe-making industry has developed rapidly. In 2007, the output of shoes was more than 10 billion pairs. In 2013, the output of shoes reached more than 20 billion pairs. More than 80% of the footwear is Adhesive shoes need to bond the sole and upper with adhesive. At present, the most commonly used shoe adhesives at home and abroad are polyurethane adhesives. According to statistics, the consumption of polyurethane adhesives from 2011 to 2014 was 118,000 tons, 127,000 tons, 138,000 tons, and 151,000 tons respectively, showing a year-on-year growth the trend of. However, the common benzene-based polyurethane adhesives on the market contain toxic solvents such as toluene / xylene...

AI Technical Summary

Problems solved by technology

However, the adhesive suffers from high solids content, poor reworkability, low initial tack, poor wettability to substrates, and high cost

In addition, when the adhesive is used for bonding shoe materials, the shoe material is particularly prone to detachment or cracking of the adhesive layer when the shoe material is worn for a long time in winter and repeatedly bent; when the adhesive product is cleaned or dried at high temperature, Adhesives are easy to soften and stick, which not only affects the performance of products, but also easily sticks to stains in the cleaning or drying environment. These problems seriously restrict the wide application of polyurethane adhesives

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