Water-based self-extinction polyurethane dispersion, and preparation method and composition thereof

A polyurethane dispersion and self-extinction technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of easy migration of plasticizers, precipitation of PVC leather plasticizers, and high gloss, and achieve excellent mechanical properties , Improve the effect of adhesion

Active Publication Date: 2020-11-17
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional method is to add matting powder to the resin to achieve a matte effect, but the addition of matting powder will lead to a decrease in the scratch resistance of the product
Making the particle size of the emulsion into a suitable range can achieve the effect of self-extinction. Chinese patent CN201610988120.6 introduces a sulfonic acid-type water-based polyurethane / acrylate self-extinction resin, which can achieve the effect of self-extinction, but in enhancing When it comes to scratch resistance, due to the poor compatibility between the anti-scratch additive and the resin, the glossiness tends to increase; in addition, because there is no cross-linking between the raw material groups, it is prone to insufficient heat-resistant yellowing, and the heat-resistant Insufficient pressure and alcohol resistance
Chinese patent CN201310651725.2 introduces a preparation method of a self-dulling water-based polyurethane coating agent for leather, but it is prone to plasticizer precipitation when used on PVC leather, and the poor compatibility of anti-scratch additives and polyurethane leads to scratches , brightening and other issues
[0004] Therefore, it is necessary to develop a new PVC leather raw material to solve the common problems of existing self-dulling resins such as easy migration of plasticizers under ultraviolet rays and insufficient scratch resistance.

Method used

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  • Water-based self-extinction polyurethane dispersion, and preparation method and composition thereof
  • Water-based self-extinction polyurethane dispersion, and preparation method and composition thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Embodiment 1: Preparation of self-dulling water-based polyurethane 1

[0099] Add 128g of 980R, 3.3g of neopentyl glycol, 1.7g of trimethylolpropane, 2.5g of 2,2-dimethylolpropionic acid and 19.05g of acetone in a four-necked flask, and at 70°C Mix and stir for 10min, cool down to 50°C and add 11g HDI and 44g IPDI reaction, react at 70°C until about NCO%=5.23wt%, cool the prepolymer to 40°C, dissolve in 134g of acetone solvent, mix for 15min, add 1.41g of triethylamine, and react at 40°C 5min, then add 2.1g of KH792 to continue the reaction for 10min, add 412g of water under the condition of shear dispersion to obtain an aqueous dispersion, then add 6.9g of LCN407, then add a mixed solution of 18.5g of IPDA and 78g of water, and stir at 35°C for 10min , and then remove acetone by distillation under reduced pressure to obtain a polyurethane dispersion with a solid content of about 30wt% (d=1400nm), then add 7.0g of ALA, stir for 5min, and obtain aqueous self-dulling ...

Embodiment 2

[0100] Embodiment 2: Preparation of self-dulling water-based polyurethane 2

[0101] Add 150g of 980R, 3g of 1,4-butanediol, 1.2g of trimethylolpropane, 1.75g ​​of 2,2-dimethylolpropionic acid and 19.63g of acetone into a four-neck flask, Mix and stir for 10min under the condition, cool down to 50℃ and add 40.6g IPDI reaction, react at 75°C until NCO%=1.87wt%, cool the prepolymer to 40°C, dissolve in 275g of acetone solvent, mix for 15min, add 1.32g of triethylamine, react at 30°C for 15min , then add 1g of KH792 to continue the reaction for 15min, add 358g of water under the condition of shear dispersion to obtain an aqueous dispersion, then add 3g of LCN407, then add a mixed solution of 3g of hydroxyethylethylenediamine and 12g of water, and stir at 45°C for 5min , and then remove acetone by distillation under reduced pressure to obtain a polyurethane dispersion with a solid content of about 35wt% (d=1200nm), then add 2.65g of ALA, stir for 5min, and obtain aqueous self-dul...

Embodiment 3

[0102] Embodiment 3: Preparation of self-dulling water-based polyurethane 3

[0103] Add 110g of 980R, 10g of PCL, 5g of neopentyl glycol, 2g of trimethylolpropane, 3g of 2,2-dimethylolpropionic acid and 19g of acetone into a four-neck flask, and mix and stir at 70°C 10min, cool down to 50°C and add 43g IPDI and 20g HDI reaction, react at 85°C until about NCO%=6.33wt%, cool the prepolymer to 40°C, dissolve in 77g of acetone solvent, mix for 15min, add 2.26g of triethylamine, and react at 45°C 10min, then add 5.3g of KH792 to continue the reaction for 15min, add 272g of water under the condition of shear dispersion to obtain a water dispersion, then add 10.5g of LCN407, then add a mixed solution of 7g of ethylenediamine and 28g of water, and stir at 15°C for 20min , and then remove acetone by distillation under reduced pressure to obtain a polyurethane dispersion with a solid content of about 40wt% (d=1500nm), then add 7.51g of ALA, stir for 5min, and obtain aqueous self-du...

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Abstract

The invention provides a water-based self-extinction polyurethane dispersion, and a preparation method and a composition thereof. According to the waterborne self-extinction polyurethane dispersion, the trihydric alcohol and the silane coupling agent are used and are further compounded with the polycarbonate polyol and other raw materials for use, so the waterborne self-extinction polyurethane dispersion has more excellent mechanical properties, thermal stability, hydrolysis resistance, chemical resistance and weather resistance. The composition is based on the waterborne self-extinction polyurethane dispersion, and comprises: (a) the waterborne self-extinction polyurethane dispersion; (b) a carboxyl crosslinking agent; (c) carboxyl group-containing macromolecular siloxane; (d) a wetting agent; and (e) a feeling agent. The composition obtained in the invention has good blackness, scratch resistance and flexing resistance on PVC leather.

Description

technical field [0001] The invention belongs to the field of PVC leather surface treatment agents, and relates to a water-based self-delustering polyurethane dispersion, a preparation method and a composition containing the water-based self-delustering polyurethane dispersion. Background technique [0002] In recent years, the sales volume of PVC leather has increased rapidly, and people's aesthetics has also been continuously improved. For PVC leather, matting, scratch resistance, chemical resistance, resistance to plasticizer migration, heat pressure resistance, flex resistance, and heat yellowing resistance have been proposed. and other performance requirements. [0003] The traditional method is to add matting powder to the resin to achieve a matte effect, but the addition of matting powder will lead to a decrease in the scratch resistance of the product. Making the particle size of the emulsion into a suitable range can achieve the effect of self-extinction. Chinese pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/44C08G18/32C08G18/34C09D175/04C09D7/65
CPCC08G18/6659C08G18/44C08G18/3206C08G18/348C09D175/04C09D7/65C08L2205/03C08L71/02C08L33/02
Inventor 周操李英卓张洁纪学顺韩克刘姗胡海东
Owner WANHUA CHEM GRP CO LTD
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