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Single-component self-crosslinking polyurethane-polyurea aqueous dispersion as well as preparation method and application thereof

A technology of polyurethane and self-crosslinking, which is applied in the fields of dyeing, textiles and papermaking, etc. It can solve the problems of rigidity of polyurethane chain segments, decrease of adhesion, and decrease of flexibility, and achieve the goal of reducing water absorption, improving adhesion, and good emulsification and dispersion Effect

Active Publication Date: 2021-06-22
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The siloxane crosslinking technology commonly used in polyurethane dispersion systems is to use silane coupling agents with amino or amino hydroxyl structures, such as patents CN108250390A and CN109679056A, to introduce siloxane structures through chemical reactions between amino or hydroxyl groups and isocyanates. In the polyurethane chain segment, the molecular weight is increased through the later hydrolytic cross-linking, which improves the application performance, but this cross-linking will cause the polyurethane chain segment to become stiff, reduce flexibility, and reduce its adhesion on the substrate

Method used

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  • Single-component self-crosslinking polyurethane-polyurea aqueous dispersion as well as preparation method and application thereof
  • Single-component self-crosslinking polyurethane-polyurea aqueous dispersion as well as preparation method and application thereof
  • Single-component self-crosslinking polyurethane-polyurea aqueous dispersion as well as preparation method and application thereof

Examples

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preparation example Construction

[0082] Another aspect of the present invention provides the preparation method of the aforementioned one-component self-crosslinking polyurethane-polyurea aqueous dispersion, comprising the following steps:

[0083] 1) Put the dehydrated components b), components a), f), c) and solvents into the reaction kettle under the protection of inert gas, and raise the temperature to 60-90 ° C for 3-8 hours to obtain the pre-isocyanate terminal Polymer;

[0084] 2) Dilute the obtained isocyanate-terminated prepolymer with a solvent, lower the temperature to below 40°C, and then add component e) for neutralization;

[0085] 3) adding deionized water to disperse under rapid stirring, and then adding component d) containing amino groups to carry out chain extension reaction;

[0086] 4) Removing the solvent to obtain the one-component self-crosslinking polyurethane-polyurea aqueous dispersion.

[0087] If component d) does not contain amino then can be added together with component b), a...

Embodiment 1

[0110] Add 250g of dehydrated polycaprolactone diol, 50g of liquefied MDI, 10g of HDI, 6g of dimethylolpropionic acid, and 50g of acetone into a 1L four-necked round-bottomed flask equipped with a nitrogen inlet and outlet. Stir the mixture until the NCO reaches 1.36%, lower the temperature below 40°C, add 220g of acetone to dilute, add 2.26g of triethylamine and 5.27g of N,N-dimethylaminopropyltrimethoxysilane for neutralization for about 5min, and stir rapidly Add 398g of deionized water to disperse, then add 2.5g of ethylenediamine for chain extension, and then separate the acetone by distillation to obtain a solvent-free polyurethane-polyurea dispersion. It has a solids content of 45% by weight and an average particle size in the dispersed phase of 203 nm determined by laser correlation, with a pH of 7.5.

Embodiment 2

[0112] Add 250g of dehydrated polytetrahydrofuran diol, 100g of dehydrated polyoxypropylene diol C2020D, 100g of liquefied MDI, 12g of dimethylolpropionic acid and 50g of acetone into a 1L four-port round bottom with nitrogen inlet and outlet In the flask, stir the mixture at 60-90°C until the NCO reaches 1.45%, cool down to below 40°C, add 190g of acetone to dilute, add 4.5g of triethylamine and 10.54g of N,N-dimethylaminopropyltrimethoxysilane Neutralize for about 5 minutes, add 541g of deionized water to disperse under rapid stirring, then add 3.05g of ethylenediamine for chain extension, and separate acetone by distillation to obtain a solvent-free polyurethane-polyurea dispersion. It has a solids content of 45% by weight and an average particle size in the dispersed phase of 193 nm determined by laser correlation, with a pH of 7.5.

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Abstract

The invention relates to a polyurethane-polyurea aqueous dispersion and a preparation method and an application thereof, the polyurethane-polyurea aqueous dispersion contains carbodiimide groups, and the carbodiimide groups can be subjected to chemical cross-linking reaction with carboxyl groups existing in a system in the later use process, so that adhesion is improved, and the service life of the polyurethane-polyurea aqueous dispersion is prolonged. A silane coupling agent with a tertiary amine group is gathered outside emulsion particles, and plays a self-crosslinking role in a later hydrolysis process, so that the crosslinking density and hydrophobic property of a coating are improved, and meanwhile, the mechanical property of a coating film is not changed. The polyurethane-polyurea aqueous dispersion disclosed by the invention has excellent storage stability and can be used in the field of polyurethane textile printing.

Description

technical field [0001] The invention relates to the field of chemical additives, in particular to a self-crosslinking polyurethane-polyurea dispersion and its preparation method and application. Background technique [0002] Due to the excellent mechanical strength and peel strength of polyurethane-polyurea dispersion, it has been widely used in coatings, adhesives, textile synthetic leather and other fields. Polyurethane-polyurea dispersions usually introduce hydrophilic groups and then ionize to obtain hydrophilicity. The presence of hydrophilic groups reduces the performance of the resin in applications such as peeling force and adhesion. [0003] In order to improve the overall performance of the polyurethane-polyurea dispersion, a crosslinking agent is usually added in the later application formula to improve the performance, among which carbodiimide and aziridine curing agents are used for the crosslinking of the polyurethane of the carboxylic acid system. US5066705 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C08G18/73C08G18/66C08G18/42C08G18/34C08G18/48C08G18/32C08G18/12C08G18/30D06P1/52
CPCC08G18/797C08G18/73C08G18/722C08G18/6659C08G18/4277C08G18/348C08G18/0823C08G18/12C08G18/4808C08G18/4854C08G18/6692C08G18/4825C08G18/4018C08G18/3206C08G18/282D06P1/5285D06P1/5292C08G18/3228
Inventor 王震朱文辉韩克邢庆达曹玉阳晋云全纪学顺
Owner WANHUA CHEM GRP CO LTD
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