Polyurethane or polyurethane-urea aqueous dispersion, preparation method and application thereof

A polyurethane and dispersion technology, used in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve insufficient activation, reduce the mobility of polyurethane segments, affect initial viscosity, strength and heat resistance, etc. problems, to achieve the effect of improving hydrolysis resistance, good bond strength and heat resistance, and reducing hydrolysis rate

Pending Publication Date: 2021-05-11
WANHUA CHEM GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the aqueous dispersion of polyurethane or polyurethane urea, the cross-linking structure reduces the mobility of the polyurethan

Method used

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  • Polyurethane or polyurethane-urea aqueous dispersion, preparation method and application thereof
  • Polyurethane or polyurethane-urea aqueous dispersion, preparation method and application thereof
  • Polyurethane or polyurethane-urea aqueous dispersion, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] 210g of polyester I, 29g of isocyanate I, 2g of polyether I, 24g of acetone, and 0.04g of bismuth neodecanoate are added to a 1L four-necked round-bottomed flask equipped with a nitrogen inlet and outlet through dehydration, at 80 The mixture was stirred at ~90°C until NCO reached 2.09%. The resulting prepolymer was dissolved in 400 g of acetone and cooled to 50°C. The 35g aqueous solution that will be dissolved with 4.63g N-(2-aminoethyl)-2-aminoethanesulfonate sodium, 2.47g N-aminoethylpiperazine, 1g hydroxyethyl ethylenediamine is added to the prepolymerized solution in acetone while stirring vigorously. After stirring for 20 min, the mixture was dispersed by adding 250 g of water. After the acetone had been separated off by distillation, 4 g of emulsifier Tween 20 were added. That is, a solvent-free polyurethane-polyurea aqueous dispersion having a solids content of 50% by weight and an average particle diameter in the dispersed phase of 180 nm measured by laser ...

Embodiment 2

[0111] Add 150g of dehydrated polyester I, 53g of dehydrated polyester II, 29g of isocyanate I, 24g of acetone, 0.04g of bismuth neodecanoate, and 2g of dehydrated polyether II into a 1L four- In a round bottom flask, the mixture was stirred at 80-90°C until the NCO reached 1.94%. The resulting prepolymer was dissolved in 380 g of acetone and cooled to 50°C. 30g aqueous solution with 2g N-(2-aminoethyl)-2-aminoethanesulfonate, 4g N,N-dimethyldipropylenetriamine, 1g hydroxyethylethylenediamine dissolved therein was added to the dissolved The acetone solution of the prepolymer was stirred vigorously. After stirring for 20 min, the mixture was dispersed by adding 210 g of water. After the acetone had been separated off by distillation, 4 g of emulsifier Tween 20 were added. That is, a solvent-free polyurethane-polyurea aqueous dispersion having a solids content of 55% by weight and an average particle diameter of 220 nm measured by laser correlation in the dispersed phase was ...

Embodiment 3

[0113] 80g of dehydrated polyester I, 33g of dehydrated polyester III, 23g of dehydrated polyester IV, 2g of dehydrated polyether I, 22g of isocyanate I, 18g of acetone, 0.04g of bismuth neodecanoate Add it into a 1L four-necked round-bottom flask equipped with a nitrogen inlet and outlet, and stir the mixture at 80-90° C. until NCO reaches 2.13%. The resulting prepolymer was dissolved in 309 g of acetone and cooled to 50°C. The 35g aqueous solution that will be dissolved with 4.6g N-(2-aminoethyl)-2-aminoethanesulfonate sodium, 1.5g N,N-dimethyldipropylene triamine, 1g hydroxyethyl ethylenediamine, is added to Dissolve the prepolymer in an acetone solution while stirring vigorously. After stirring for 20 min, the mixture was dispersed by adding 224 g of water. After the acetone had been separated off by distillation, 4 g of emulsifier Tween 20 were added. That is, a solvent-free polyurethane-polyurea aqueous dispersion having a solids content of 45% by weight and an averag...

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Abstract

The invention belongs to the technical field of polyurethane aqueous dispersions, and particularly relates to a polyurethane or polyurethane-urea aqueous dispersion, a preparation method and application thereof, and the polyurethane or polyurethane-urea is prepared by reaction of raw materials comprising the following components: a) a compound containing a tertiary amine group and at least one NCO reactive functional group, b) polyester polyol having a number average molecular weight of 400-5000 and a functionality of 2-3, c) an organic compound having at least two isocyanate groups, d) a hydrophilic compound containing one or more of an ionic group, a latent ionic group and a nonionic group and containing 2-3 NCO reactive functional groups, and e) a monofunctional nonionic hydrophilic compound containing at least one NCO reactive functional group. The aqueous dispersion disclosed by the invention is stable in storage and long in storage time, the hydrolysis resistance of an adhesive prepared from the dispersion is improved, and meanwhile, relatively good bonding strength and heat resistance of the aqueous dispersion can be maintained.

Description

technical field [0001] The invention belongs to the technical field of polyurethane water dispersions, in particular to a polyurethane or polyurethane-urea water dispersion and its preparation method and application. Background technique [0002] Due to the excellent brushability, excellent initial adhesion and peel strength and outstanding resistance, the aqueous dispersion of polyurethane or polyurethane urea has been widely used in the fields of coatings, adhesives and textile coatings. When the aqueous dispersion of polyurethane or polyurethane urea is used in the adhesive, in order to improve the performance of the adhesive, the polyester polymer polyol is mainly used for synthesis. During the processing, use and storage of the ester polymer, due to Irreversible hydrolysis reactions will occur under the action of water vapor and acidic substances existing in the environment. The cracking and breaking of macromolecules caused by hydrolysis directly leads to the reductio...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/48C08G18/32C08G18/12C09J175/06
CPCC08G18/6622C08G18/4018C08G18/4238C08G18/4833C08G18/3271C08G18/3855C08G18/3848C08G18/12C09J175/06
Inventor 宋泽峰孙永建纪学顺黎会亮张延成王远勇
Owner WANHUA CHEM GRP CO LTD
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