Anti-whitening PU synthetic leather and preparation method thereof

Abstract

The invention provides a preparation method of anti-whitening PU synthetic leather. According to preparation of a surface treatment layer, a leather blank synthesized by composite polyurethane is subjected to surface layer treatment to obtain the surface treatment layer; the surface layer treatment preparation comprises the steps of preparing a surface treatment layer liquid, coating the surface treatment layer liquid and baking; in the step of preparing the surface treatment layer liquid, 5-10 parts of an isocyanate bridging agent (HDI) is introduced into the basic solution, the stirring speed is 350-450 rpm, the stirring time is 60-65 min, the viscosity of the solution is controlled to be 700-1500 cps at the temperature of 25 DEG C, and then the surface of the leather blank is evenly coated with the surface treatment layer liquid through roller coating equipment; after coating, the synthetic leather enters a drying oven for drying treatment, so that the coated surface treatment liquid forms cured synthetic leather; the mechanical vibration abrasion performance of the synthetic leather prepared by the invention is not damaged after 30,000 times of reciprocating friction tests under the load of 1kg; and the problem that the surface of the product is too smooth due to overuse of the wear-resistant agent is avoided, and meanwhile the phenomena of folding whitening and vertex angle whitening are not prone to occurring.

Description

technical field [0001] The invention relates to the technical field of PU synthetic leather processing, in particular to an anti-whitening PU synthetic leather and a preparation method of the anti-whitening PU synthetic leather. Background technique [0002] In automotive decoration, PU synthetic leather is widely used in high-end automotive interiors because of its advantages closer to natural leather. Polyurethane (PU) resin is a polymer with repeating structural units of carbamate chain segments made by the reaction of isocyanate and polyol. Its main feature is that the molecular chain contains multiple repeating "urethane" groups. It has both the elasticity of rubber and the strength of plastic and excellent processing performance. Because it has the dual advantages of rubber and plastic, it can be considered as a combination of excellent properties of rubber and plastic. With the increasingly fierce competition in the automobile market, the design of automobile interio...

AI Technical Summary

Problems solved by technology

However, the inevitable result of the development of these appearance expressions is the decline of its surface physical properties, such as: surface abrasion resistance, tear strength, flame retardancy, etc.

Especially surface abrasion, with the post-processing (such as punching) of the leather surface, the surface area decreases, the processing surface is traumatized, etc., resulting in a significant decline in abrasion performance, which ultimately affects user experience; therefore, the present invention provides an anti- Whitening PU synthetic leather, and the preparation method of the anti-whitening PU synthetic leather

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