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Organic silicon modified aqueous polyurethane

A water-based polyurethane and silicone technology, applied in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, adhesive types, etc., can solve the problems of water-based PU storage stability decline, etc., to achieve good hand feeling and easy control and operation, the effect of low surface energy

Inactive Publication Date: 2006-11-01
广州宏昌胶粘带厂
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The non-reactive type also has the problem of silicon migration, and the epoxy group will react with the carboxyl group on the PU molecular chain, resulting in a decrease in the storage stability of water-based PU

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 2

[0036] (2) Synthesis process of prepolymer

[0037] Add IPDI, N-210 and dibutyltin dilaurate into a dry reaction kettle equipped with a thermometer, agitator and reflux condenser, raise the temperature to 60-100°C and react until the content of isocyanate group reaches the theoretical value, add dissolved NMP Continue to react the DMPA in the solution for about 1 hour, then add BD to react until the isocyanate group content is 2.7%, cool down to about 40°C, add triethylamine to neutralize to obtain a prepolymer, and add solvent to adjust the viscosity as needed during the whole process.

[0038] (3) Preparation of water dispersion

[0039] Implementation example 1: Pour the prepolymer into deionized water, and after high-speed shear dispersion, add aminoethylaminopropylmethyldimethoxysilane to react for about 1 hour, and discharge.

[0040]Implementation Example 2: Pour deionized water into the prepolymer, stir at high speed to disperse, then add aminoethylaminopropylm...

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PUM

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Abstract

An organic silicon modified water-based polyurethane and its production are disclosed.The polyurethane consists of low-polymer polybasic alcohol, vulcabond and chain extender. The production is carried out by dispersing pre-polymer in water, adding ammonia silane coupling agent into system, synthesizing pre-polymer, reacting amine base with residual vulcabond base, chain extending for pre-polymer while hydrolytic condensation polymerizing, cross-linked reacting and obtaining final product. It has better water resistance and handle, less surface performance and wider temperature range. It can be used for pigment, leather finishing agent and adhesive.

Description

1. Technical field [0001] The invention belongs to the technical field of polymer materials and their preparation, and relates to a silicone-modified polyurethane elastomer material and a preparation method thereof. 2. Background technology [0002] The polyurethane aqueous dispersion prepared by the internal emulsification method has a high water absorption rate and is not resistant to wet rubbing. The cross-linking method is the most effective for its water resistance. However, for one-component water-based PU, the degree of internal crosslinking is too large, the viscosity of the prepolymer is high, it is not conducive to dispersion, and the emulsion is also unstable, so it is limited to greatly improve the water resistance and wet rub resistance of the film. Therefore, under the premise of maintaining a certain degree of internal crosslinking, waterborne polyurethane is modified by introducing silicone with good low surface energy, water resistance, high and low temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/85C08G18/10C09D175/04C09J175/04D06M15/568
Inventor 孙启龙黄少婵李建宗吴伟卿涂伟萍
Owner 广州宏昌胶粘带厂
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