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Method for preparing organic silicon graft modified polyurethane resin for synthetic leather

A polyurethane resin, graft modification technology, applied in textiles, papermaking, fiber processing, etc., can solve the problems of difficulty in synthesizing grafted silicone-modified polyurethanes and cannot be grafted side chains, and achieve smooth and durable hand feel. The effect of maintaining the property and improving the water contact angle

Active Publication Date: 2014-10-08
WENZHOU KELAIEN SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the synthesis of grafted organosilicon-modified polyurethane is extremely difficult. So far, there is no real research and patent of grafted organosilicon-modified polyurethane. Chinese patent CN103483526 discloses a silicone-grafted modified polyester type polyurethane Polymer and its preparation and application. It adopts the reaction of organosilicon with both ends of hydroxyl and trimethylchlorosilane, trying to block one end hydroxyl of the organosilicon with both ends of hydroxyl to obtain single-end hydroxyl organosilicon, and then the single-end hydroxyl organic silicon Silicon introduced into polyurethane as grafted side chains
This patent has serious theoretical flaws. The reaction between 1 mol of organosilicon with hydroxyl groups at both ends and 1 mol of trimethylchlorosilane is completely a probability selective reaction. Hydroxyl chlorosilane reacts to form terminal hydroxyl silicone, this part of the product cannot react with polyurethane prepolymer to connect to the polyurethane structure; 50% of the terminal hydroxyl of silicone with hydroxyl at both ends reacts with trimethylchlorosilane to form a single terminal Hydroxyl silicone, and the reaction of single-end hydroxyl silicone with polyurethane prepolymer can only become the terminal chain of polyurethane structure and cannot become a grafted side chain; Chlorosilane reaction, this part of silicone reacts with polyurethane prepolymer to become the main chain of polyurethane structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] With 140 parts of polyester diol, its molecular weight is 2000, heat up to 110°C, vacuum dehydrate for 1 hour, cool down to 50°C, add 400 parts of dimethylformamide to the reaction kettle, 30 parts of one end contains two hydroxyl groups , the other end does not contain active hydrogen groups to make high-purity silicone, its molecular weight is 50000, 8 parts of 1,4-butanediol, 10 parts of ethylene glycol and stir well; add 25 parts of TDI, 35 parts of MDI, 0.5 parts of organic bismuth Catalyst, stir and heat up to 75°C, react for 3.5 hours, add 250 parts of toluene, keep the temperature at 75°C, use 8.8 parts of MDI to increase viscosity, feed once every 45 minutes, 0.5 to 3 parts each time, after the viscosity reaches the predetermined value Cool down to 60°C, add 100 parts of methyl ethyl ketone and stir evenly, cool to 30°C and discharge to obtain a solid content of 25% silicone graft-modified polyurethane resin.

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PUM

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Abstract

The invention discloses a method for preparing an organic silicon graft modified polyurethane resin for synthetic leather. The method comprises the following step: polymerizing a chain extender, diisocyanate, a polymer polyhydric alcohol, micromolecule polyhydric alcohol and an organic metal catalyst in an organic solvent at 50-100 DEG C, wherein organic silicon of which one end contains two hydroxide radicals and the other end contains no active hydroxide radical is adopted as the chain extender. In the process that the grafted organic silicon modified resin is filmed, organic silicon chain segments are connected with a polyurethane structure through covalent bonds, the organic silicon chain segments are enriched on the surface of a coating, the water contact angle of the surface of the obtained coating is improved, the surface of the coating is smooth in hand feeling and bright in gloss, the properties of the surface of the coating are long-lasting and are hard to damage by mechanical and washing action, and thus the resin is an excellent and long-lasting synthetic leather surface treatment material.

Description

technical field [0001] The invention relates to the field of new chemical materials, in particular to a preparation method of organosilicon graft-modified polyurethane resin for synthetic leather. Background technique [0002] Silicone has low surface energy, and the adhesion of silicone material to the surface of synthetic leather coating can improve the feel of the coating surface, improve the waterproof and antifouling ability of the coating. However, when the pure silicone material is used as a surface additive, the silicone is only attached to the coating surface through weak physical adsorption, and is easily damaged by mechanical action or washing. As the coating material is used for a long time, the coating surface performance gradually loses . In order to increase the long-term performance of the silicone surface, the silicone structure is usually chemically bonded into the molecular structure of the coating polyurethane resin to obtain a silicone-modified polyuret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/61C08G18/42D06M15/564D06M15/572
CPCC08G18/4009C08G18/42C08G18/61C08G18/664D06M15/564D06M15/572
Inventor 张维淼
Owner WENZHOU KELAIEN SCI & TECH
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