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Polyurethane or polyurethane urea aqueous dispersion, preparation method thereof and water-based clothing leather base

A polyurethane urea and polyurethane technology, applied in the field of clothing leather bass, can solve the problems of weak sensuality, weak force, and poor resilience.

Active Publication Date: 2021-09-10
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent CN106947048A discloses a method for preparing water-based polyurethane for the preparation of water-based clothing leather bases. It uses polyether polyols with large molecular weight and polyether amines with large molecular weights to carry out post-chain extension by post-chain extension. Increasing the molecular weight can Although the resulting garment leather feels soft and has a good resin flocculation effect, the pure linear structure makes the hand feel soft and at the same time has poor recovery after deformation and insufficient resilience. At the same time, the macromolecular polyether has poor polarity, making the peel strength Low
[0004] Patent CN111961177A discloses a preparation method of highly elastic polyurethane-polyurea water dispersion and its application in printing coating, by adopting an amine containing polyether segment to reduce the density of urea bond content and reduce the force of hydrogen bond , so as to provide a good extension, after adding a part of the chain extender m-xylylenediamine to provide strength, but the overall reason is that the hydrogen bond between the chain segments is weak, resulting in a high elongation rate of the chain segment and good resilience. Weakness will cause a decrease in endurance
[0005] Patent CN108456296A discloses a water-based polyurethane for garment leather and its preparation method, using macromolecular polyols and adding part of silicone modifiers, the macromolecular polyols provide long molecular soft segments, and the added organic silicon Modifiers are diamino and monoamino silane coupling agents. Macromolecular polyols make the garment leather feel soft, but the long polyether satin structure makes its resistance poor. Diamino and monoamino silane coupling The addition of chain extenders can improve the stripping, and the addition of post-chain extenders can improve the strength and provide hard segments. Compared with the wet method, there is still a gap in the resistance and rebound of garment leather when using the dry method.
[0006] Due to technical restrictions on the use of water-based polyurethane resin for garment leather, the development of water-based garment leather is limited, especially in the softness of the hand, weak flesh, poor drape, low peel strength, poor resilience, and high temperature and high humidity resistance. After the test, the surface is shiny and sticky, etc.

Method used

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  • Polyurethane or polyurethane urea aqueous dispersion, preparation method thereof and water-based clothing leather base
  • Polyurethane or polyurethane urea aqueous dispersion, preparation method thereof and water-based clothing leather base
  • Polyurethane or polyurethane urea aqueous dispersion, preparation method thereof and water-based clothing leather base

Examples

Experimental program
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Effect test

Embodiment 1

[0084] Preparation of aqueous dispersions of polyurethane or polyurethane urea:

[0085] 1) Under the protection of inert gas, contact and mix 200gC2040, 60gC2140, 54gTDI, 9gDMPA, 0.12g catalyst and 32g acetone, and react at 80°C until the reaction mixture in the system has reached or slightly lower than the theoretical isocyanate content of 4.21% , to obtain the isocyanate-terminated prepolymer I;

[0086] 2) Cool down the system containing the prepolymer I, add 8g of 1,2-propanediol and 49.65g of acetone, and carry out chain extension reaction at 80°C until the reaction mixture in the system has reached or slightly lower than the theoretical isocyanate content of 1.48% , to obtain the isocyanate-terminated prepolymer II;

[0087] 3) Add 207g of acetone solvent to the system containing the prepolymer II to dilute and cool down to 40°C, add 4.41gTEA for neutralization reaction for 5min; 3g of 2-(3-trimethoxysilylpropyl)guanidine is diluted with acetone After the reaction, ad...

Embodiment 2

[0094] Preparation of aqueous dispersions of polyurethane or polyurethane urea:

[0095] 1) Under the protection of inert gas, contact and mix 180gC2040, 60gC2140, 69gTDI, 11gDMPA, 0.12g catalyst and 32g acetone, and react at 80°C until the reaction mixture in the system has reached or slightly lower than the theoretical isocyanate content of 6.07% , to obtain the isocyanate-terminated prepolymer I;

[0096] 2) Cool down the system containing the prepolymer I, add 10g of 1,2-propanediol and 49.5g of acetone, and carry out chain extension reaction at 80°C until the reaction mixture in the system has reached or slightly lower than the theoretical isocyanate content of 2.50% , to obtain the isocyanate-terminated prepolymer II;

[0097] 3) Add 207g of acetone solvent to the system containing the prepolymer II to dilute and cool down to 40°C, add 5.39gTEA for neutralization reaction for 5min; 5g of 2-(3-trimethoxysilylpropyl)guanidine is diluted with acetone After the reaction, a...

Embodiment 3

[0101] Preparation of aqueous dispersions of polyurethane or polyurethane urea:

[0102] 1) Under the protection of inert gas, contact and mix 210gC2040, 50gC2140, 60gTDI, 9gDMPA, 0.12g catalyst and 39g acetone, and react at 90°C until the reaction mixture in the system has reached or slightly lower than the theoretical isocyanate content of 4.84% , to obtain the isocyanate-terminated prepolymer I;

[0103] 2) Cool down the system containing the prepolymer I, add 9g of 1,2-propanediol and 50.7g of acetone, and carry out chain extension reaction at 80°C until the reaction mixture in the system has reached or slightly lower than the theoretical isocyanate content of 1.84% , to obtain the isocyanate-terminated prepolymer II;

[0104] 3) Add 207g of acetone solvent to the system containing the prepolymer II to dilute and cool down to 40°C, add 4.41gTEA for neutralization reaction for 5min; 4g of 2-(3-trimethoxysilylpropyl)guanidine is diluted with acetone After the reaction, add...

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Abstract

The invention discloses a polyurethane or polyurethane urea aqueous dispersion, a preparation method thereof and a water-based clothing leather base. The polyurethane or polyurethane urea is a reaction product prepared from the following components: diol and / or polyol, di-and / or poly-isocyanate, a hydrophilic compound, a bifunctional micromolecular alcohol chain extender, a polyfunctional organic silicon coupling agent, a neutralizer, and a micromolecular amine compound containing a rigid structure group and simultaneously containing two reaction active groups. The obtained aqueous dispersion is high in flocculation speed and good in flocculation effec. The obtained clothing leather base is soft and smooth in hand feeling, strong in fleshy feeling, strong in draping feeling, good in rebound resilience and high in peel strength, the clothing leather base is not thinned after being subjected to high temperature and high humidity in a jungle test, and the surface is not brightened or sticky.

Description

technical field [0001] The invention belongs to the technical field of garment leather bases, and in particular relates to a polyurethane or polyurethane urea aqueous dispersion and a preparation method thereof, water-based garment leather bases and a preparation method thereof. Background technique [0002] At present, synthetic leather has been used in various fields of people's life, and there are various varieties. Garment leather is a kind of synthetic leather product. At present, the main preparation of garment leather is to use solvent-based polyurethane to make DMF ( Dimethylformamide) is replaced with water, so that the coating has continuous pores, so as to achieve moisture permeability and air permeability. It has the characteristics of light weight, wear resistance, heat resistance, toughness, good cold resistance and high tensile strength. Patent CN103351456B provides a polyether copolymer with a special structure and a special process, so that the prepared gar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/34C08G18/38C08G18/12D06N3/14D06N3/00
CPCC08G18/6692C08G18/348C08G18/4808C08G18/4825C08G18/4837C08G18/12C08G18/0823D06N3/14D06N3/0061D06N3/0043D06N2211/10D06N2211/28D06N2209/1664D06N2209/06C08G18/3206C08G18/3893C08G18/325
Inventor 朱文辉王震孙小鹏邢庆达韩克曹玉阳纪学顺
Owner WANHUA CHEM GRP CO LTD