Hydrolysis-resistant aqueous polyester and preparation method thereof

A water-based polyester resin, hydrolysis-resistant technology, applied in the direction of polyester paint, coating, latex paint, etc., can solve the problems of hydrolysis resistance, water resistance, unsatisfactory coating film processing, poor storage stability, etc., to achieve Effect of reducing potential and strong hydrolysis resistance

Inactive Publication Date: 2017-10-20
HAOLISEN COATING SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current water-based polyester coatings generally have poor storage stability, unsatisfactory hydrolysis resistance, water resistance and coating film processing.

Method used

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  • Hydrolysis-resistant aqueous polyester and preparation method thereof

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[0014] In another aspect, the present invention provides a method for preparing a hydrolysis-resistant water-based polyester, the steps are as follows;

[0015] 25-30g neopentyl glycol, 18-20g hexanediol, 18-22g 2-methyl-propylene glycol, 5-8g pentaerythritol, 10-12g adipic acid, 35-40g dimethylol propane acid, 12-15g Add terephthalic acid and 0.05-0.08g of dibutyltin oxide into a reaction vessel with a stirrer and a condenser, blow nitrogen, slowly raise the temperature to 140°C, and then raise the temperature to 240°C at a heating rate of 20°C / h, keep Esterification at this temperature until the acid value (KOH) reaches 30-60 mg / g, and the hydroxyl value (KOH) reaches 60-130 mg / g;

[0016] Then lower the temperature to 100°C, add 10-15g of ethylene glycol butyl ether and 25-30g of curing agent hexamethylolmelamine methyl ether resin, stir and dilute, and then neutralize with 3-5g of N,N-dimethylethanolamine to obtain the main chain Waterborne polyester with carboxyl functio...

Embodiment 1

[0019] The hydrolysis-resistant waterborne polyester resin provided by the present invention is made up of the following raw materials: 25g of neopentyl glycol, 18g of hexanediol, 18g of 2-methyl-propylene glycol, 5g of pentaerythritol, 10g of adipic acid, dimethylol Propanic acid 35g, terephthalic acid 12g, dibutyltin oxide 0.05g, ethylene glycol butyl ether 10g, hexamethylol melamine methyl ether resin 25g, N,N-dimethylethanolamine 3g.

[0020] The invention provides a method for preparing a hydrolysis-resistant water-based polyester, the steps are as follows;

[0021] 25g of neopentyl glycol, 18g of hexanediol, 18g of 2-methyl-propylene glycol, 5g of pentaerythritol, 10g of adipic acid, 35g of dimethylolpropanoic acid, 12g of terephthalic acid and 0.05g of dibutyltin oxide were added to the tape In the reaction vessel of the stirrer and the condenser, pass nitrogen, slowly heat up to 140°C, then heat up to 240°C at a heating rate of 20°C / h, keep this temperature for esterif...

Embodiment 2

[0024] The invention provides a hydrolysis-resistant water-based polyester resin, which is composed of the following raw materials: 30 g of neopentyl glycol, 20 g of hexanediol, 22 g of 2-methyl-propylene glycol, 8 g of pentaerythritol, 12 g of adipic acid, and dimethylol Propanic acid 40g, terephthalic acid 15g, dibutyltin oxide 0.08g, ethylene glycol butyl ether 15g, hexamethylol melamine methyl ether resin 30g, N,N-dimethylethanolamine 5g.

[0025] The invention provides a method for preparing a hydrolysis-resistant water-based polyester, the steps are as follows;

[0026] 30g of neopentyl glycol, 20g of hexanediol, 22g of 2-methyl-propylene glycol, 8g of pentaerythritol, 12g of adipic acid, 40g of dimethylolpropanoic acid, 15g of terephthalic acid and 0.08g of dibutyltin oxide were added to the tape In the reaction vessel of the stirrer and the condenser, pass nitrogen, slowly heat up to 140°C, then heat up to 240°C at a heating rate of 20°C / h, keep this temperature for es...

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Abstract

The invention relates to a hydrolysis-resistant aqueous polyester and a preparation method thereof. The method comprises the following steps: i) adding neopentylene glycol, hexanediol, 2-methyl-propylene glycol, pentaerythritol, adipic acid, dihydroxymethyl propane acid, terephthalic acid and dibutyltin oxide in a reaction container having a stirrer and a condenser, introducing nitrogen, slowly heating the materials to the temperature of 140 DEG C, then heating the materials to the temperature of 240 DEG C with a heating speed of 20 DEG C/h, keeping the temperature for esterification until the acid value reaches 30-60 mg/g, and the hydroxyl value reaches 60-130 mg/g; and ii) cooling the material to the temperature of 100 DEG C, adding ethylene glycol monobutyl ether and a curing agent hexahydroxymethyl melamine methyl ether for stirring and diluting, then neutralizing the materials by N,N-dimethyl ethanolamine to prepare the product. The hydrolysis-resistant aqueous polyester has good storage stability, hydrolysis resistance, water resistance and film processing performance.

Description

[technical field] [0001] The invention belongs to the technical field of water-based coatings and preparation methods, and in particular relates to hydrolysis-resistant water-based polyesters and a preparation method. [Background technique] [0002] With the increasing awareness of energy conservation and environmental protection in society, relevant environmental protection regulations impose strict restrictions on the content of volatile organic solvents. It is an industrial development trend to use water instead of organic solvents as the dispersion medium for water-based coatings. Polyester resin is made by esterification of polybasic acid and polyol. Polyester resin has excellent performance such as glossiness and fullness, mechanical properties such as impact resistance and flexibility, weather resistance and substrate adhesion. wide. The current polyester is mainly solvent-based, and the development of water-based polyester to replace solvent-based polyester has impo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G63/60C09D167/04C09D5/02
CPCC08G63/912C08G63/60C09D5/02C09D167/04
Inventor 黄磊刘薇薇周贤胡浩东王海波徐庆贾龙娟
Owner HAOLISEN COATING SHANGHAI
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