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Waterborne polyurethane dispersion and single-component waterborne adhesive with same for PVC (polyvinyl chloride) calendered coatings

A water-based polyurethane and dispersion technology, applied in the direction of textiles and papermaking, etc., can solve the problems of reduced service life, strong taste, residue, etc., and achieve the effect of low cost, low solid content, and stable peel strength

Active Publication Date: 2019-05-10
WANHUA CHEMICAL (NINGBO) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of a large amount of plasticizers and other materials in the production of PVC calendering coatings, during long-term use, due to the migration of plasticizers, the PVC layer is separated from the fabric substrate, reducing the service life, so it is necessary to coat a layer Adhesive layer, solvent-based PU adhesive is commonly used at present, because of its strong taste, it will leave toxic and harmful substances such as DMF, toluene, methyl ethyl ketone, etc., and the bubbles of PVC coating products will be caused by solvent volatilization. With the increase of people's environmental awareness, Restricted by national policies, solvent-based PU adhesives are difficult to meet the increasingly high environmental protection requirements in home decoration, raincoats, etc.

Method used

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  • Waterborne polyurethane dispersion and single-component waterborne adhesive with same for PVC (polyvinyl chloride) calendered coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 240g of dehydrated poly(1,4-butylene adipate) (molecular weight: 3000), 50g of TDI-80, 20g of HMDI, 36.5g of acetone, and an appropriate amount of catalyst (bismuth isooctanoate, 100ppm) to the nitrogen inlet and outlet. In a 1 L four-neck round bottom flask, the mixture was stirred at 60-80° C. until NCO reached 6.8%. Add 8g of 1,4-butanediol, 14g of dimethylolpropionic acid and 80g of acetone and continue the reaction at 60°C until NCO reaches 1.70. Then add 200g of acetone to dilute and cool down to 40°C, add 9.51g of triethylamine to neutralize for 10 minutes, add 503g of water under high-speed stirring to stir and disperse, add 3.0g of ethylenediamine to continue stirring for 15 minutes. After separating the acetone from the obtained acetone-containing emulsion by distillation, a solvent-free aqueous polyurethane dispersion with a particle size of 45 nm was obtained.

[0045] Take 100 parts of the obtained water-based polyurethane and add it into the dispersio...

Embodiment 2

[0047] Add 240g of dehydrated poly-1,4-butylene adipate (molecular weight: 2000), 50g of TDI-80, 35g of HMDI, 36.6g of acetone, and an appropriate amount of catalyst (bismuth isooctanoate, 100ppm) into the nitrogen inlet and outlet. In a 1 L four-neck round bottom flask, the mixture was stirred at 60-80° C. until NCO reached 6.99%. Add 8g of 1,4-butanediol, 15g of dimethylolpropionic acid and 80g of acetone and continue the reaction at 60°C until the NCO reaches 1.81. Then add 210g of acetone to dilute and cool down to 40°C, add 10.2g of triethylamine to neutralize for 10min, add 503g of water under high-speed stirring to stir and disperse, add 4.2g of ethylenediamine to continue stirring for 15min. After separating the acetone from the obtained acetone-containing emulsion by distillation, a solvent-free aqueous polyurethane dispersion with a particle size of 50 nm was obtained.

[0048] Take 100 parts of the obtained water-based polyurethane and add it into the dispersion ta...

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Abstract

The invention relates to a waterborne polyurethane dispersion and a single-component waterborne adhesive with the same for PVC (polyvinyl chloride) calendered coatings. The single-component waterborneadhesive has good softness and high adhesive strength and comprises the waterborne polyurethane dispersion, a waterborne leveling agent, a waterborne wetting agent, a waterborne defoaming agent, a pHregulator, and a thickener. The invention also relates to a roller application technique which employs the single-component waterborne adhesive for calendered coatings. The single-component waterborne adhesive for PVC calendered coatings disclosed herein may be combined with PVC paste and textile base, with scraping and rolling processes involved; a prepared PVC calendered coating has very high initial viscosity, post-stabilizing peel strength, plasticizer resistance, and jungle resistance, and is widely applicable to packaging bags, raincoats, tablecloths, curtains and the like.

Description

technical field [0001] The invention relates to a water-based polyurethane dispersion and a single-component water-based adhesive for PVC calendering coating including the same, in particular to a water-based adhesive for calendering coating applied to a roll coating process PVC coating, and also to PVC The coating uses a one-component water-based adhesive preparation method. Background technique [0002] Due to its high chemical stability, polyvinyl chloride resin can be used in various fields such as making anti-corrosion pipes, pipe fittings, oil pipelines, centrifugal pumps and blowers. In daily life, polyvinyl chloride is used to make PVC artificial leather and PVC coating. After mixing and plasticizing PVC and plasticizer, use a three-roller or four-roller calender to apply directly on the textile substrate after high temperature to make a transparent or colored textile coating with a specified thickness. The PVC calendered coating is light in weight , water resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/73C08G18/76C08G18/66C08G18/42C08G18/34C08G18/32D06N3/00D06N3/14
Inventor 邓俊英李海峰王震纪学顺
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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