A kind of polyurethane resin for medium-soft organosilicon modified high-physical property surface layer and preparation method thereof

Abstract

The invention discloses a polyurethane resin for a medium-soft organosilicon-modified surface layer with high physical properties and a preparation method thereof. The polyurethane resin, in parts by mass, comprises the following raw materials: 40-70 parts of diisocyanate, 100-150 parts of polyol compound parts, 3-10 parts of amine-terminated organosilicon, 10-20 parts of polyol chain extender, 0.02-0.1 part of catalyst, and 450-650 parts of solvent; the present invention prepares low molecular weight prepolymer by reacting diisocyanate and polyol compound , and then add the amino-terminated silicone to the low molecular weight prepolymer to carry out the grafting reaction, so that the amino-terminated silicone is completely compatible with the end blocks of the polyurethane chain, significantly improving the grafting rate of the amino-terminated silicone and eliminating free small molecules The presence of silicone oil is conducive to improving the dispersion stability of pigments in polyurethane slurry during post-processing, eliminating pigment precipitation, flocculation and stratification in the slurry and other abnormalities, and improving the appearance quality of products.

Description

technical field [0001] The invention belongs to the field of synthetic leather processing, and in particular relates to a medium-soft organosilicon modified polyurethane resin for a surface layer with high physical properties 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 require good wear resistance and hydrolysis resistance, but also put forward higher requirements for their appearance, feel and touch. In recent years, the soft and skin-friendly synthetic leather has become popular among market customers, and 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, flexural resistance, and hydrolysis resistance of the polyurethane resin used for the medium and soft surf...

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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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