Double-solution type preparation method for high-heat-resistance high-wear-resistance polyurethane

Abstract

The invention relates to a double-solution type preparation method for high-heat-resistance high-wear-resistance polyurethane (PU). A hydroxyl-containing half-reaction-subjected polymer solution A and an isocyanate-containing half-reaction-subjected polymer solution B are mixed for a secondary reaction, a base material is coated with the reaction product by a coating machine, and a PU synthetic membrane is formed by solidifying the coating. The half-reaction-subjected polymer solution A and the isocyanate-containing half-reaction-subjected polymer solution B are respectively formed by performing a prepolymerization reaction. Needed PU is prepared by performing a polymerization reaction on the half-reaction-subjected polymer solution A and solution B with new functionality and structure properties, and then at a reaction temperature of about 80 DEG C, by combining with a coating machine for production, the PU synthetic film with high heat resistance and high wear resistance is produced; and PU synthetic leather can be formed by covering base cloth when coating is performed. The double-solution type preparation method does not employ a solvent as a carrier, and is capable of solving the environment protection problem of air and water pollution.

Description

technical field [0001] The present invention relates to a manufacturing method of polyurethane synthetic film / skin, and in particular to a solvent-free, non-thermosetting and non-single-component polyurethane manufacturing process. In this process, after pre-polymerizing half-reaction polymers A and B, the two liquids are mixed to form a liquid mixed solution, and the liquid mixed solution is solidified (about 30 minutes before the liquid mixed solution is solidified by coating machinery and equipment at about 80°C). ) Coating the liquid mixed solution onto the substrate to produce a polyurethane synthetic film / skin with high heat resistance and high wear resistance. Background technique [0002] Due to the increasing living standards and knowledge level of modern people, people's consumption demand for daily necessities (such as leather, etc.) is also relatively increasing. However, natural resources are limited, so it has gradually become a trend to replace real leather w...

AI Technical Summary

Problems solved by technology

[0005] 1. In the traditional PU film synthesis method, in order to facilitate the coating operation, the PU resin needs to be dissolved or melted into a liquid state, so that the urethane bond in the PU resin must be destroyed first, resulting in insufficient mechanical strength of the product , easy to cause peeling, abrasion and flexibility can not meet the high-end market requirements

[0006] 2. In the traditional PU film synthesis method, the urethane bond in the produced PU film is not so good that its melting point cannot exceed 170°C

The holes with larger pore diameters are often generated close to the surface of the PU foam layer, and most of the holes are unevenly distributed.

[0009] 5. In the traditional PU film synthesis method, a large amount of solvent is used, and the base material is mostly release paper, which is easily eroded by the solvent, resulting in damage to the expensive release paper and increasing the cost

Images