Solvent-free environment-friendly polyurethane automobile leather surface resin as well as preparation method and application thereof

Abstract

The invention provides solvent-free environment-friendly polyurethane automobile leather surface resin which is prepared by mixing a component A with a component B at a mass ratio of 2:1, wherein the component A is prepared from the following raw materials in percentage by weight: 87.6%-96.5% of polycarbonate diol, 1.0%-8.7% of liquid chain extender, 0.4%-3.0% of solid chain extender, 0.5%-1.2% of catalyst, 0.5%-2.0% of optical / thermal stabilizer, 0.1%-0.2% of defoamer and 1.0%-2.0% of solvent-free color paste; the component B is prepared from the following raw materials in percentage by weight: 5.0%-15.0% of polycarbonate diol, 36.0%-55.0% of polytetrahydrofuran diol, 39.8%-49.6% of aliphatic isocyanate, 0.05%-0.1% of catalyst and 0.1%-0.2% of H3PO4. The invention further provides a preparation method and application of the resin. The resin is environment-friendly and can be bent for 100,000 times at low temperature of minus 25 DEG C.

Description

technical field [0001] The invention belongs to the technical field of chemical products and preparation methods thereof, and relates to a solvent-free and environment-friendly polyurethane automobile leather surface layer resin, and also relates to a preparation method and application of the resin. Background technique [0002] With the improvement of people's living standards in our country and the development of the automobile industry, the development prospect of automobile seat leather is getting better and better, but at present, the automobile seat leather is basically PVC leather and solvent-based polyurethane leather. [0003] PVC automotive leather is to coat the fiber base cloth with PVC, which needs to add a large amount of plasticizer and other additives. The resulting automotive leather has serious defects such as strong odor, plasticizer is not environmentally friendly and easy to migrate to the surface. It is more serious in the small space of the car, so PVC...

AI Technical Summary

Problems solved by technology

Solvent-based automotive leather has excellent performance, but its fabric and foam layer contain a large amount of harmful solvent DMF, which causes serious production pollution. In addition, DMF cannot be completely removed from the leather, which is harmful to human health when used; environmentally friendly water-based polyurethane automotive leather The surface layer, foam layer and adhesive layer resin are all water-based polyurethane resin. Although it is more environmentally friendly and harmless to the human body, its physical properties such as wear resistance and scratch resistance on the surface are far behind those of solvent-based polyurethane leather. , and expensive, difficult to promote

[0005]Sun Weidong and others published the patent "A Microfiber Environmental Protection Automobile Leather" (publication number CN 201598513 U), the environmental protection microfiber base cloth used, It can be bent at a low temperature of -20°C and 80,000 times, and has excellent physical properties. However, the surface layer is still made of solvent-based polycarbonate fabric, and the bottom material is also a solvent-based PU adhesive layer, so it is not conducive to environmental protection requirements.