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Polyurethane-polyurea aqueous dispersion, as well as preparation method and application in water-based wood coating thereof

A technology of polyurethane and dispersion, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of unrecorded water-based resin preparation and characteristics, and focus on the combination of coating formulas, so as to improve the effect of warming wood, improve drying speed and cross-linking The effect of increasing the joint density and improving the hole penetration

Active Publication Date: 2019-06-28
WANHUA CHEMICAL (NINGBO) CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent documents CN 103232797A and CN 102559027 B describe the preparation of paints for color correction. The two patents only use water-based resins to prepare paints for color repairs. They do not record the preparation and characteristics of the water-based resins used. They focus on the combination of paint formulations in the later stage

Method used

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  • Polyurethane-polyurea aqueous dispersion, as well as preparation method and application in water-based wood coating thereof
  • Polyurethane-polyurea aqueous dispersion, as well as preparation method and application in water-based wood coating thereof
  • Polyurethane-polyurea aqueous dispersion, as well as preparation method and application in water-based wood coating thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0089] 100g dehydrated polycaprolactone diol, 100g glycerin modified soybean oil, 5g polyethylene glycol monomethyl ether, 15g polyoxypropylene trihydric alcohol WANOL R2305, 95g TDI-80, 25g HMDI and 65g acetone Add it into a 1L four-neck round-bottom flask equipped with a nitrogen inlet and outlet, and stir the mixture at 80-90° C. until the NCO reaches 7.0 wt%. Cool down to 50-55°C, add 4g of 1,4-butanediol, 12g of 2,2-dimethylolpropionic acid (DMPA), and 75g of acetone, raise the temperature to 60°C and continue the reaction until the NCO reaches 2.35wt%. Cool down to 40-45°C and add 7.3g of triethylamine to neutralize for about 5 minutes, then add 700g of water to disperse the mixture, add 4.1g of ethylenediamine after the dispersion and continue to stir and extend the chain for 10 minutes. After separation of the acetone by distillation, a solvent-free dispersion was obtained which had a solids content of 35% by weight, an average particle size of 165 nm and a pH value of...

Embodiment 2

[0091] 110g glycerin modified soybean oil, 5g polyethylene glycol monomethyl ether, 35g polyoxypropylene trihydric alcohol WANOLR2305, 120g TDI-80 and 65g acetone were added in a 1L four-necked round bottom flask equipped with a nitrogen inlet and outlet, The mixture was stirred at 80-90°C until NCO reached 11.1 wt%. Cool down to 50-55°C and add 6g of 1,4-butanediol, 12g of 2,2-dimethylolpropionic acid (DMPA), 75g of acetone, raise the temperature to 60°C and continue the reaction until the NCO reaches 2.50wt%. Cool down to 40-45°C and add 8.2g of triethylamine to neutralize for about 5 minutes, then add 592g of water to disperse the mixture, add 3.8g of ethylenediamine after the dispersion and continue stirring for 10 minutes to extend the chain. After separation of the acetone by distillation, a solvent-free dispersion was obtained which had a solids content of 35% by weight, an average particle size of 105 nm and a pH of 8.5.

Embodiment 3

[0093] Add 110g of glycerin modified soybean oil, 3g of polyethylene glycol monomethyl ether, 40g of polyoxypropylene trihydric alcohol WANOLS3007, 163g of HMDI65g of acetone into a 1L four-neck round-bottomed flask equipped with a nitrogen inlet and outlet. The mixture was stirred at °C until the NCO reached 8.0 wt%. Lower the temperature to 50-55°C and add 16g of 2,2-dimethylolpropionic acid (DMPA) and 75g of acetone, then raise the temperature to 60°C and stir to continue the reaction until the NCO reaches 2.0wt%. Cool down to 40-45°C and add 9.7g triethylamine to neutralize for about 5min, then disperse the mixture by adding 564g water, and then separate the acetone by distillation to obtain a solvent-free dispersion with a solid content of 30.8wt%. The average particle size is 90nm and the pH value is 8.5.

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Abstract

The invention belongs to the technical field of aqueous dispersion and water-based coating, and provides a polyurethane-polyurea aqueous dispersion, as well as a preparation method and application inwater-based wood coating thereof. The aqueous dispersion and water-based coating is prepared from the following solid components in percentage by weight, totally 100 percent: (a) 10-45 percent of polyol modified vegetable oil; (b) 0-43 percent of non-polypropylene oxide polyol; (c) 10-50 percent of isocyanate having the functionality of 2-4; (d) 1-10 percent of a compound with an ionogenic group;(e) 0-10 percent of a low-molecular compound containing hydroxy and / or amido; (f) 4-20 percent of polypropylene oxide polyol having the functionality of 2-4; and (g) a nonionic hydrophilic compound having single functionality. The aqueous dispersion has excellent ethanol diluting resistance, and realizes excellent perforation, rubbing property, fullness, scratch resistance and chemical resistance.

Description

technical field [0001] The invention belongs to the technical field of water dispersions and water-based coatings, and in particular relates to a vegetable oil-modified polyurethane-polyurea water dispersion, a preparation method thereof, and an application thereof in water-based wood coatings. Background technique [0002] Water-based polyurethane dispersion uses water as the dispersion medium, is non-toxic, odorless, and non-flammable, and is an environmentally friendly polymer material. At present, the color essence used in the field of color correction mostly uses ethanol as a solvent, which puts forward higher requirements for the solvent resistance of water-based resins. Traditional water-based dispersions are generally not resistant to ethanol dilution. When directly adding ethanol for dilution, it will be diluted Water-based dispersions often have significantly poor fluidity and even demulsification. In addition, with the development of water-based technology, the r...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/75C08G18/66C08G18/42C08G18/48C08G18/44C08G18/36C08G18/12C08G18/32C08G18/34C09D175/14C09D175/02
Inventor 孙伟祖王震朱文辉李燕邓俊英纪学顺
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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