Polyurethane resin for medium-soft organic silicon modified high-physical-property surface layer and preparation method of polyurethane resin

Abstract

The invention discloses polyurethane resin for a medium-soft organic silicon modified high-physical-property surface layer and a preparation method of the polyurethane resin, and the polyurethane resin comprises the following raw materials in parts by mass: 40-70 parts of diisocyanate, 100-150 parts of polyol compound, 3-10 parts of amine-terminated organic silicon, 10-20 parts of a polyol chain extender, 0.02-0.1 part of a catalyst and 450-650 parts of solvent; the preparation method comprises the following steps: preparing a low-molecular-weight prepolymer through reaction of diisocyanate and a polyol compound, and then adding amino-terminated organic silicon into the low-molecular-weight prepolymer to perform grafting reaction, so that the amino-terminated organic silicon is completelycompatible with a polyurethane chain end block, the grafting rate of the amino-terminated organic silicon is remarkably increased, and the existence of free small molecular silicone oil is eliminated;the dispersion stability of a pigment in the polyurethane slurry during post-processing use is improved, abnormities of pigment precipitation, flocculation layering and the like in the slurry are eliminated, and the appearance quality of the product is improved.

Description

technical field [0001] The invention belongs to the field of synthetic leather processing, and in particular relates to a polyurethane resin for medium-soft organosilicon-modified high-physical-property surface layer and a preparation method thereof. Background technique [0002] With the improvement of people's living standards, people have higher and higher requirements for synthetic leather furniture products, which not only need to have good wear resistance and hydrolysis resistance, but also put forward higher requirements for its appearance, feel and touch. In recent years, soft and skin-friendly synthetic leather has been favored by customers in the market. This trend will inevitably put forward new requirements for the front-end material polyurethane. [0003] In the prior art, to solve the problem of weak physical properties such as wear resistance, flex resistance, and hydrolysis resistance of polyurethane resin used for medium and soft surfaces, it is mainly throu...

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Problems solved by technology

[0003] In the prior art, to solve the problem of weak physical properties such as wear resistance, flex resistance, and hydrolysis resistance of polyurethane resin used for medium and soft surfaces, it is mainly through the selection of high-durability materials such as polyether polyols and polycarbon polyols. Improve the deficiencies of the above properties of polyurethane resin

In addition, in order to further improve the wear resistance of polyurethane, hydroxy silicone oil can be introduced into the system. However, after hydroxy silicone oil is introduced into the polyurethane system, on the one hand, due to the low grafting rate of hydroxy silicone oil, there is free hydroxy silicone oil in the system. There is a hidden danger of precipitation; on the other hand, most hydroxy silicone oils are not stable enough for pigments, and there are many kinds of polyurethane coating pigments. After the slurry is prepared and before it is used, problems such as pigment floating out of the surface, flocculation, and slurry layering will occur. , leading to problems such as discoloration of final synthetic leather products, inconsistent color and gloss before and after production, product quality fluctuations, increased waste, and increased production costs

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