Polyurethane resin and preparation method and application thereof

Abstract

The invention provides polyurethane resin. The polyurethane resin is mainly prepared from, by weight, 150 parts to 200 parts of polyols, 10 parts to 45 parts of chain extender, 100 parts to 150 parts of isocyanate, 0.1 part to 10 parts of antioxidant, 0.1 part to 1 part of reaction terminator, 500 parts to 800 parts of solvent and reaction activity regulator. The polyols contain 40 percent to 70 percent of PTMG, 0 to 45 percent of polyester polyol, 0 to 15 percent of polycarbonate diol, 0 to 25 percent of polycaprolactone diol and 5 percent to 10 percent of modified polydimethylsiloxane diol. The invention further provides a preparation method and application of the polyurethane resin. Tiny and even cells can be formed when the prepared polyurethane resin is used for processing superfine fiber synthetic leather, and thus the produced superfine fiber product can have fine fold lines and plump fleshy feeling.

Description

technical field [0001] The invention belongs to the technical field of polyurethane synthetic materials, and in particular relates to a polyurethane resin and its preparation method and application. Background technique [0002] Polyurethane synthetic leather is one of the most important varieties of artificial synthetic leather today, and polyurethane microfiber synthetic leather is a high-end product in polyurethane synthetic leather. In 2013, the annual domestic sales volume of polyurethane microfiber synthetic leather was 162 million square meters, and in recent years, it has maintained a double-digit growth rate every year. The reason why microfiber synthetic leather can develop rapidly in a relatively short period of time is not only due to the domestic emphasis on environmental protection and the lack of natural resources, but also because of its appearance that resembles natural leather and the natural leather. Physical properties (fastness, durability) are the key ...

AI Technical Summary

Problems solved by technology

Therefore, in order to increase the deformation ability of the surface layer, the hardness and density of the surface layer must be reduced. If the hardness is reduced, a low-modulus polyurethane resin can be used, and if the density is reduced, a foamed middle or bottom layer resin can be used; If the deformation ability is reduced, the hardness, density and cell density of the bass must be increased. The increase in hardness can be achieved by using a high modulus resin, and the increase in density can be achieved by using a high solid content resin. By increasing the modulus And increasing the density to improve the supporting ability of the bass will lead to an increase in the hardness of the entire product and a worse feel

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