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Method for preparing light-fast waterborne polyurethane coating material

A technology of water-based polyurethane and light resistance, which is applied in polyurea/polyurethane coatings, coatings, etc., to achieve the effects of improving leveling, reducing toxicity problems, and improving light resistance efficiency

Active Publication Date: 2014-10-08
广州产协高分子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The light resistance of polyurethane is often improved by adding UV absorbers and antioxidants, but the traditional synthetic antioxidants include tert-butyl hydroxyanisole, tert-butyl hydrogen peroxide Hydroquinone, tert-butyl hydroquinone, etc. have great toxic side effects and carcinogenicity, so it is necessary to find efficient, environmentally friendly, and light-resistant technologies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] (1) Dissolve 1 g of cerium oxide and 2.5 g of yttrium oxide in 25 mL of aqueous nitric acid solution with a concentration of 0.1 mol / L, raise the temperature to 40°C, add 0.5 g of sodium gluconate and cis-1,3,5-trimethylcyclohexane Amine-1,3,5-tricarboxylic acid 1.05g, adjust the pH of the mixed solution to 4, react for 1h, add 2-(2′-hydroxy-5′-methylphenyl)benzotriazole 2.5g at 50°C, fully Stir the reaction for 2h to obtain the mixed solution A;

[0020] (2) In a 500ml four-neck flask equipped with a stirring blade, a thermometer, and a condenser tube, mix 83.3g of polytetrahydrofuran ether glycol with 33.3g of isophorone diisocyanate, and mix them in 0.23g of dibutyltin dilaurate catalyst Under the condition of existence, react at 80°C for 1h, add 0.12g of sphingomyelin and 0.23g of coumarin, react for 2h, and react at a temperature of 90°C to obtain 116g of polyurethane prepolymer A;

[0021] (3) Add 1.39g of gallic acid, 13.9g of 1,4-dioxane and 5.8g of riboflavin...

example 2

[0023] (1) Dissolve 1 g of cerium oxide and 2.5 g of yttrium oxide in 25 mL of aqueous nitric acid solution with a concentration of 0.1 mol / L, raise the temperature to 40°C, add 0.5 g of sodium gluconate and cis-1,3,5-trimethylcyclohexane Amine-1,3,5-tricarboxylic acid 1.05g, adjust the pH of the mixed solution to 4, react for 1h, add 2-(2′-hydroxy-5′-methylphenyl)benzotriazole 2.5g at 50°C, fully Stir the reaction for 2h to obtain the mixed solution A;

[0024] (2) In a 500ml four-necked flask equipped with a stirring blade, a thermometer, and a condenser tube, mix 75.2g of polytetrahydrofuran ether glycol with 16.7g of isophorone diisocyanate, and add 0.46g of dibutyltin dilaurate catalyst Under the condition of existence, react at 100°C for 4h, add vincristine sulfate 0.37g and coumarin 0.46g, reaction time 2h, reaction temperature 90°C, obtain 92g polyurethane prepolymer A;

[0025] (3), add epicatechin 2.94g, 1,4-dioxane 23g and riboflavin sodium phosphate 7.4g to prepol...

example 3

[0027] (1) Dissolve 1 g of cerium oxide and 2.5 g of yttrium oxide in 25 mL of aqueous nitric acid solution with a concentration of 0.1 mol / L, raise the temperature to 40°C, add 0.5 g of sodium gluconate and cis-1,3,5-trimethylcyclohexane Amine-1,3,5-tricarboxylic acid 1.05g, adjust the pH of the mixed solution to 4, react for 1h, add 2-(2′-hydroxy-5′-methylphenyl)benzotriazole 2.5g at 50°C, fully Stir the reaction for 2h to obtain the mixed solution A;

[0028] (2) In a 500ml four-necked flask equipped with a stirring blade, a thermometer, and a condenser tube, mix 116.6g of polytetrahydrofuran ether glycol with 33.3g of isophorone diisocyanate, and mix them in 0.52g of dibutyltin dilaurate catalyst Under the condition of existence, react at 90°C for 3.5h, add 0.38g of dihydrosphingomyelin and 0.53g of coumarin, react for 2h, and react at 90°C to obtain 150g of polyurethane prepolymer A;

[0029] (3) Add 3.3g of wolfberry polysaccharide, 27.8g of 1,4-dioxane and 9.8g of ribo...

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Abstract

The invention discloses a method for preparing a light-fast waterborne polyurethane coating material. The method comprises the steps: mixing polytetrahydrofuran ether glycol and isophorone diisocyanate in the presence of a dibutyltin dilaurate catalyst, reacting for 1-4 hours at the temperature of 80-100 DEG C, adding liposome and coroxon, and reacting for 2 hours at the temperature of 90 DEG C, so as to obtain a polyurethane prepolymer A; adding a chain extender, 1,4-dioxane and riboflavin sodium phosphate into the prepolymer A, reacting for 1.5-3.5 hours at the temperature of 65-85 DEG C, adding a mixed solution A, reacting for 1-2 hours at the temperature of 75-85 DEG C, adding triethylamine to carry out neutralization reaction for 30-50 minutes, and adding water to emulsify, thereby obtaining the light-fast waterborne polyurethane coating material. The prepared light-fast polyurethane coating material is environment-friendly and cheap, is widely applied to the surfaces of walls, furniture and metallic utensils and serves as a binder of plastics, glass, paper making and textiles.

Description

[0001] Technical field The present invention relates to the preparation method of paint, particularly to a kind of preparation method of light-resistant waterborne polyurethane paint. Background technique [0002] Polyurethane is mainly used in leather finishing, textile printing and dyeing, papermaking, architectural coatings, adhesives, etc. The coatings and paints sprayed on the surface of internal and external walls, furniture, and metal appliances are in direct or indirect contact with humans all the time. , Harmful coatings have also threatened people's health at all times. Because the field of use is often exposed to sunlight, because the sun’s rays contain a large amount of ultraviolet light harmful to colored objects, its wavelength is about 290-460nm, these harmful ultraviolet light changes the color of the paint through chemical oxidation and reduction. [0003] Dibutyltin dilaurate is often used as a catalyst for the polymerization of polyurethane, but because the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D7/12C08G18/66C08G18/48C08G18/10C08G18/24
Inventor 段宝荣高晓琳张建国
Owner 广州产协高分子有限公司
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