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Polyurethane-polyurea aqueous dispersion for synthetic leather as well as preparation method and application thereof

A technology of polyurethane and dispersion, which is applied in the field of polyurethane-polyurea aqueous dispersion and its preparation, and can solve the problems of oiliness and staining on the surface of the foam layer

Active Publication Date: 2020-04-17
WANHUA CHEM GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ammonium stearate has the best foam stabilization effect, but it also has disadvantages, that is, the stearic acid generated after the decomposition of ammonium stearate will remain in the foam layer, and it is easy to separate out, causing the surface of the foam layer to become oily and dirty. Problems plaguing the industry

Method used

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  • Polyurethane-polyurea aqueous dispersion for synthetic leather as well as preparation method and application thereof
  • Polyurethane-polyurea aqueous dispersion for synthetic leather as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 110g dehydrated polyether polyol PTMEG2000 (component b), 120g polyether polyol PPG (component b), 15.0g HDI (component c), 42.9g MDI-50 (component c), 4.0 g After dehydration treatment MPEG1200 (component d)), 4.6g 1,4-butanediol (component f) and 40g acetone were added to a 1L four-neck round bottom flask equipped with nitrogen inlet and outlet, and stirred at 60~90℃ This mixture is until -NCO reaches 2.38 wt%. Add 460g of acetone to dilute and cool to 40-45°C and add 47.6g of water diluted 5.6g of sodium ethylenediaminoethyl sulfonate (50% aqueous solution) (component e), 10.0g of N-aminoethylmorpholine ( Component a) react for about 15 minutes, add 1.54g of light stabilizer TINUVIN 292 (component h) and stir evenly, add 468g of deionized water to disperse under rapid stirring. After separating the acetone by distillation, a solvent-free polyurethane-polyurea dispersion was obtained. It has a solid content of 40% by weight, an average particle size of 170 nm, and a ...

Embodiment 2

[0063] 240g of dehydrated polyether polyol PTMEG2000 (component b), 11.5g HDI (component c), 49g MDI-50 (component c), 6.0g dehydrated MPEG1200 (component d), 4.5g 1 ,4-Butanediol (component f) and 38g of acetone were added to a 1L four-neck round bottom flask equipped with nitrogen inlet and outlet, and the mixture was stirred at 60-90°C until -NCO reached 2.21wt%. Add 400g of acetone to dilute and cool to 40-45℃ and add 6g of sodium ethylenediaminoethyl sulfonate (50% aqueous solution) diluted with 48g of water (component e), 6.1g of N-aminoethylmorpholine (component a) React with 2g IPDA (component g) for about 15 minutes, add 3.23g light stabilizer TINUVIN 292 and stir evenly, add 490g deionized water to disperse under rapid stirring. After separating the acetone by distillation, a solvent-free polyurethane-polyurea dispersion was obtained. It has a solid content of 40% by weight, an average particle size of 131 nm, and a pH of 8.7.

Embodiment 3

[0065] 160g of dehydrated PTMEG2000 (component b), 170g of PPG (component b), 23g of HDI (component c), 35g of MDI-50 (component c), 6.0g of dehydrated MPEG1200 (component d) Add 48 g of acetone to a 1 L four-neck round bottom flask equipped with nitrogen inlet and outlet, and stir the mixture at 60-90° C. until -NCO reaches 2.08 wt%. Add 400g of acetone to dilute and cool to 40-45℃ and add 6g of sodium ethylenediaminoethyl sulfonate (50% aqueous solution) diluted with 50g of water (component e), 8g of N-aminoethylmorpholine (component a) ) After reacting for about 15 minutes, add 6.12g of light stabilizer TINUVIN 292 and stir evenly, and add 618g of deionized water for dispersion under rapid stirring. After separating the acetone by distillation, a solvent-free polyurethane-polyurea dispersion was obtained. It has a solid content of 40% by weight, an average particle size of 144 nm, and a pH of 8.9.

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Abstract

The invention provides a polyurethane-polyurea aqueous dispersion containing a tertiary amine group as well as a preparation method and an application thereof. The dispersion is mainly prepared from the following reaction raw materials: a) at least one amine which contains the tertiary amine group and has the functionality of 1; b) at least one polyol having the functionality of 2 to 4 and a number average molecular weight of 500 g / mol to 15000 g / mol; c) at least one polyisocyanate component; d) at least one non-ionic polyol having the number average molecular weight of 500 g / mol to 10,000 g / mol, which is different from component b); and optionally other components. The polyurethane-polyurea aqueous dispersion provided by the invention can be used as synthetic leather foaming resin, is especially suitable for a foaming system containing ammonium stearate (STA), and has the characteristic of inhibiting stearic acid precipitation.

Description

Technical field [0001] The invention relates to a polyurethane-polyurea water dispersion and its preparation method and application. The molecular backbone of the dispersion contains unionized tertiary amine groups. Background technique [0002] As a new type of material, polyurethane-polyurea water dispersion is non-flammable, non-toxic, and non-polluting. It is widely used in coatings, adhesives, textiles and other fields. In the field of water-based synthetic leather, polyurethane-polyurea water dispersions have been widely used due to their excellent resilience and hand feel. In the field of foam leather, commonly used foam stabilizers include silicone foam stabilizers, silicone resin polyether emulsions (MPS), fatty alcohol polyoxyethylene ether sodium sulfate (AES), stearates, etc., except for stearic acid Salts and other foam stabilizers also have defoaming functions. Ammonium stearate has the best effect in stabilizing foam, but it also has disadvantages, that is, stea...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/75C08G18/73C08G18/66C08G18/48C08G18/32C08G18/38C08G18/44
CPCC08G18/7671C08G18/755C08G18/724C08G18/73C08G18/4854C08G18/4808C08G18/4825C08G18/4018C08G18/3206C08G18/44C08G18/2865C08G18/3857
Inventor 王震纪学顺赵炳炎张树翔晋云全王远勇邓俊英
Owner WANHUA CHEM GRP CO LTD
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