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

The technology of polyurethane resin and silicone is applied in the field of polyurethane resin and its preparation for modified high-physical property surface layer of medium-soft silicone, which can solve the problem of wear resistance, bending resistance, weak hydrolysis resistance, and hydroxyl silicone oil grafting rate of the polyurethane resin. It can ensure the flexural resistance, eliminate the existence of free small molecular silicone oil, and achieve the effect of soft hand feeling.

Active Publication Date: 2022-07-26
HEFEI ANLI POLYURETHANE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Add 72 parts of polycarbonate polyol (molecular weight 2000) and 28 parts of polyether polyol (molecular weight 2000) into the reaction kettle, heat the reaction kettle to 100°C, dehydrate in vacuum for about 1 hour, and cool down to 50°C; Add 150 parts of dimethylformamide, 1.1 parts of 1,4-butanediol, 6.8 parts of ethylene glycol, and 35 parts of diphenylmethane diisocyanate, stir evenly, heat up to 70°C, and react for about 50 minutes; then add 6 Then, 4 parts of diphenylmethane diisocyanate were added at 70°C, reacted for 20 minutes, 0.02 part of organic bismuth catalyst was added, and the reaction was continued for 30 minutes; to the above In the reactor, the remaining 4.3 parts of diphenylmethane diisocyanate were added in batches to carry out chain extension reaction. The feeding interval of each step was 40-60 minutes, and the reaction temperature was 70 ° C. As the viscosity of the system increased, the remaining 478 parts of solvent were used to divide Three s...

Embodiment 2

[0064] Add 72 parts of polycarbonate polyol (molecular weight 2000) and 28 parts of polyether polyol (molecular weight 2000) into the reaction kettle, heat the reaction kettle to 100°C, dehydrate in vacuum for about 1 hour, and cool to 50°C; Add 150 parts of dimethylformamide, 1.1 parts of 1,4-butanediol, 6.8 parts of ethylene glycol, and 35 parts of diphenylmethane diisocyanate, stir evenly, raise the temperature to 70°C, and react for about 50 minutes; then add 3 Then, 4 parts of diphenylmethane diisocyanate were added at 70°C, reacted for 20 minutes, 0.02 part of organic bismuth catalyst was added, and the reaction was continued for 30 minutes; to the above In the reactor, the remaining 4.2 parts of diphenylmethane diisocyanate were added in batches to carry out chain extension reaction, the feeding interval of each step was 40-60 minutes, and the reaction temperature was 70 ° C. As the viscosity of the system increased, the remaining 466 parts of solvent were used to divide...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/61C08G18/48C08G18/44C08G18/40C08G18/32
CPCC08G18/7671C08G18/6607C08G18/61C08G18/48C08G18/44C08G18/4018C08G18/3206
Inventor 武春余田海英姚克俭王燕武黄万里
Owner HEFEI ANLI POLYURETHANE NEW MATERIAL
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