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Preparation method for lightproof and waterproof polyurethane coating

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

Active Publication Date: 2014-10-01
HEBEI CHENYANG INDAL & TRADE GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The light resistance of polyurethane resin is often improved by adding ultraviolet absorbers and antioxidants, but the traditional synthetic antioxidants include tert-butyl hydroxyanisole, hydrogen peroxide Tert-butyl, 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

[0023] (1) Dissolve 0.5 g of neodymium oxide and 0.7 g of dysprosium oxide in 10 mL of nitric acid aqueous solution with a concentration of 0.1 mol / L, raise the temperature to 60 ° C, add 0.4 g of chestnut thorn shell extract and 3-methoxy-4-hydroxy 0.6g of mandelic acid, adjust the pH of the mixed solution to 5, react for 1h, add 0.5g of o-hydroxybenzoic acid and 0.4g of sodium polyphosphate at 70°C, stir and react for 2h to obtain the mixed solution A;

[0024] (2), in the 500ml four-necked flask that stirring paddle, thermometer, condensing pipe are housed, polytetrahydrofuran ether glycol 105g is mixed with dicyclohexylmethane diisocyanate 30g, in the presence of dibutyltin dilaurate catalyst 0.41g Under the conditions, react at 60°C for 1h, add 0.14g of methylthiouracil and 0.27g of drostansterone, react for 1h, and react at a temperature of 80°C to obtain 135g of polyurethane prepolymer A;

[0025] (3) Add 2.03g of 4,8-dihydroxyquinoline-2-carboxylic acid, 24.3g of N-met...

example 2

[0027] (1) Dissolve 0.5 g of neodymium oxide and 0.7 g of dysprosium oxide in 10 mL of nitric acid aqueous solution with a concentration of 0.1 mol / L, raise the temperature to 60 ° C, add 0.4 g of chestnut thorn shell extract and 3-methoxy-4-hydroxy 0.6g of mandelic acid, adjust the pH of the mixed solution to 5, react for 1h, add 0.5g of o-hydroxybenzoic acid and 0.4g of sodium polyphosphate at 70°C, stir and react for 2h to obtain the mixed solution A;

[0028] (2), in the 500ml four-necked flask that stirring paddle, thermometer, condensing pipe are housed, polytetrahydrofuran ether glycol 135g is mixed with dicyclohexylmethane diisocyanate 30g, in the presence of dibutyltin dilaurate catalyst 0.99g Under the conditions, react at 85°C for 4h, add 0.66g of methylthiouracil and 0.83g of drostansterone, react for 1h, and react at a temperature of 80°C to obtain 167g of polyurethane prepolymer A;

[0029] (3) Add 5.68g of L-serine, 41.8g of N-methylpyrrolidone and 3.3g of form...

example 3

[0031] (1) Dissolve 0.5 g of neodymium oxide and 0.7 g of dysprosium oxide in 10 mL of nitric acid aqueous solution with a concentration of 0.1 mol / L, raise the temperature to 60 ° C, add 0.4 g of chestnut thorn shell extract and 3-methoxy-4-hydroxy 0.6g of mandelic acid, adjust the pH of the mixed solution to 5, react for 1h, add 0.5g of o-hydroxybenzoic acid and 0.4g of sodium polyphosphate at 70°C, stir and react for 2h to obtain the mixed solution A;

[0032] (2), in the 500ml four-necked flask that stirring paddle, thermometer, condensing pipe are housed, polytetrahydrofuran ether glycol 120g is mixed with dicyclohexylmethane diisocyanate 30g, in the presence of dibutyltin dilaurate catalyst 0.68g Under the conditions, react at 70°C for 2.5h, add 0.38g of methylthiouracil and 0.53g of drostansterone, react for 1h, and react at a temperature of 80°C to obtain 151g of polyurethane prepolymer A;

[0033] (3) Add 3.7g of 2-aminophenol-4-(2'-carboxy)sulfonanilide, 32.5g of N-m...

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Abstract

The invention discloses a preparation method for lightproof and waterproof polyurethane coating. The preparation method for the lightproof and waterproof polyurethane coating comprises the following steps: under the condition that the dibutyltin dilaurate catalyst exists, PTMG and dicyclohexyl methane diisocyanate are mixed; the reaction is conducted for 1-4 hours at a temperature of 60-85 DEC G; methyl thiouracil and drostanolone are added; the reaction time lasts for 1 hour; the reaction temperature is 80 DEC G; a polyurethane prepolymer A is obtained; chain extender, N- methyl pyrrolidone and formamide are added to the polyurethane prepolymer A; the reaction is conducted for 2.5-3.5 hours at 75 -85 DEC G; a mixed liquor A is added; the reaction temperature is 70-95 DEC G; the reaction time is 2-3 hours; a neutralizers is added for a neutralization reaction for 30-50 min; water is added for emulsification; the lightproof and waterproof polyurethane coating is obtained. The prepared lightproof and waterproof polyurethane coating is environment friendly and inexpensive in price. Therefore, the lightproof and water-based polyurethane coating can be extensively applied to surfaces of the wall bodies, furniture and metal wares and served as binding agent of plastics, glass, paper manufacturing and textile.

Description

[0001] Technical field The present invention relates to the preparation method of polyurethane, relate in particular to a kind of preparation method of light fastness waterborne polyurethane coating. 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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D7/12C08G18/83C08G18/75C08G18/48C08G18/34C08G18/38C08G18/32
Inventor 朱蕾高晓琳张建国
Owner HEBEI CHENYANG INDAL & TRADE GROUP CO LTD
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