Flexibility-enhanced polyurethane

Abstract

The invention provides a flexibility-enhanced polyurethane. A preparation method of the flexibility-enhanced polyurethane comprises the following reaction steps: 1, preparation of an ionic liquid polymer with a dihydroxy group; 2, preparation of an ionic liquid polymer modified polyurethane prepolymer; and 3, preparation of the flexibility-enhanced polyurethane. The modified polyurethane preparedby the preparation method has the advantages of high flexibility, good film forming property, strong mechanical properties, high thermal stability, high chemical stability, high tensile strength, difficult shedding or explosion, energy saving, environmental protection and wide application range.

Description

technical field [0001] The invention relates to the field of polyurethane industry, in particular to a polyurethane with enhanced softness. Background technique [0002] The leather industry covers tanning, shoemaking, leather clothing, leather goods, fur and its products, etc. Before the leather is made into products, the surface of the leather must be treated to facilitate leather processing and improve the performance of the leather. However, these surfaces , but most of these surface treatment agents use acrylic resin as the carrier and are prepared by adding matting powder, silicone oil, solvent and other additives. They have poor elasticity and are easy to fall off. In recent years, polyurethane has become more and more popular among leather manufacturers because of its excellent performance. Gradually replaced acrylic resin, but when ordinary polyurethane is used for finishing agents and retanning agents, its toughness, elasticity, heat resistance, adhesion and abrasi...

AI Technical Summary

Problems solved by technology

[0002] The leather industry covers tanning, shoemaking, leather clothing, leather goods, fur and its products, etc. Before the leather is made into products, the surface of the leather must be treated to facilitate leather processing and improve the performance of the leather. However, these surfaces , but most of these surface treatment agents use acrylic resin as the carrier and are prepared by adding matting powder, silicone oil, solvent and other additives. They have poor elasticity and are easy to fall off. In recent years, polyurethane has become more and more popular among leather manufacturers because of its excellent performance. Gradually replaced acrylic resin, but when ordinary polyurethane is used for finishing agents and retanning agents, its toughness, elasticity, heat resistance, adhesion and abrasion resistance are poor, and organic solvents such as DMF are usually used as Solvent, the solvent volatilizes during use and causes environmental pollution, and the gloss and fullness of the film are not ideal. Therefore, people began to improve polyurethane to improve its performance.

[0003] Ionic liquid refers to a liquid composed entirely of ions. It is a substance composed of ions that is liquid at room temperature or near room temperature. Ionic liquids are colorless, odorless, pollution-free, green and environmentally friendly, and have high thermal stability and chemical stability. Stability, modifying polyurethane with ionic liquid to prepare a new type of coating with both ionic liquid and polyurethane to overcome the shortcomings of polyurethane, but ionic liquid has high viscosity and poor formability, which is not easy to process and use

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