Preparation method of waterborne polyester resin used in coil coatings and application thereof

A water-based polyester resin and coil coating technology, which is applied in the preparation of water-based polyester resin, coatings, and the manufacture of coil coatings with low organic solvent content, to achieve the effects of reducing environmental pollution, saving energy, and reducing usage

Active Publication Date: 2013-01-23
SHANGHAI HUAYI FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Coatings for pre-coated coils are an important field in the coatings industry. Due to factors such as performance, economy, and coating equipment restructuring, the production process is still dominated by solvent-based coatings. At present, only a small amount of water-based coatings are used in Europe, America and other regions in the world. Coatings, there is no report on production and application in China

Method used

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  • Preparation method of waterborne polyester resin used in coil coatings and application thereof
  • Preparation method of waterborne polyester resin used in coil coatings and application thereof
  • Preparation method of waterborne polyester resin used in coil coatings and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The raw material components and proportions used in the preparation of water-based polyester resins are shown in Table 1.

[0026] Table 1

[0027]

[0028]

[0029] Add neopentyl glycol and isophthalic acid-5-sodium sulfonate in a 1000ml three-necked flask equipped with a stirrer, a reflux condenser, and a thermometer. Slowly heat under continuous stirring, add catalyst butyltin triisooctoate after the reactants are dissolved, raise the temperature of the reaction mixture to 200°C and keep it for 3 hours, then lower the temperature to 100°C, add other raw materials, slowly raise the temperature to 200°C, and keep the temperature for 5 hours ; When the acid value reaches below 15mgKOH / g, cool down to 150°C, add glycidyl tertiary carbonate, and keep warm for 4 hours. Add solvent and water to obtain water-based polyester. According to the national standard measurement, what is obtained is a transparent water-based polyester resin with a solid content of 55% and a v...

Embodiment 2

[0031] The preparation process and other formulations are the same as in Example 1 except that the isophthalic acid in the formulation is converted into an equivalent amount of hexahydrophthalic anhydride. The obtained product is a transparent water-based polyester resin with a solid content of 55% and a viscosity of 3450 centipoise according to the national standard.

Embodiment 3

[0033] Except that part of the isophthalic acid-5-sodium sulfonate in the formula is converted into an equivalent amount of isophthalic acid, the preparation process and other formulas are the same as in Example 1. The obtained product is a blue light water-based polyester resin with a solid content of 55% and a viscosity of 677 centipoise according to the national standard.

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Abstract

Disclosed are a preparation method of waterborne polyester resin used in coil coatings and an application thereof. The preparation method comprises the following steps of: (1) performing prepolymerization between a certain amount of alcohol and a carboxyl group containing hydrophilic monomer under the action of a catalyst at 170-240 DEG C, wherein the OH / COOH ratio is 2-20; (2) adding other raw materials of alcohol and acid after the acid value is less than 3mgKOH / g, slowly heating up, and insulating at 180-230 DEG C for 3-8 hours; (3) refluxing by the use of 5-30 wt% of a hydrocarbon solvent to remove small molecular water after the acid value is less than 90mgKOH / g; (4) cooling to below 150 DEG C, adding a small molecular monomer containing an epoxy group, and stop heating after the acid value is less than 2mgKOH / g; and (5) adding a hydrophilic solvent and water to obtain the waterborne polyester resin. The combination of the obtained waterborne polyester resin, a crosslinking component and a painting base stock is suitable for the production of a low-VOC water-based top-coat which is used on metal coils.

Description

technical field [0001] The present invention relates to the paint industry in the field of chemical industry, in particular to a preparation method and application of a water-based polyester resin that meets environmental protection requirements, and this polyester resin is particularly suitable for manufacturing coils with low organic solvent content coating. Background technique [0002] Coil coating is applied to the surface of steel plate and aluminum by roller coating, and then made into pre-coated coil (color-coated plate). Coil coating was first successfully developed by Hunter Engineering Company in 1937. It developed rapidly after World War II. Because its process adopts a high-speed continuous operation mode, it can reduce costs and pollution for users, and it has beautiful appearance and bright colors. , high strength, good corrosion resistance, convenient processing and molding, etc., the application field is more and more extensive. At present, the importance ...

Claims

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Application Information

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IPC IPC(8): C08G63/91C08G63/688C08G63/78C09D167/00C09D167/02C09D5/23
Inventor 俞剑峰潘红霞朱梅芳何建文黄燕孙凌
Owner SHANGHAI HUAYI FINE CHEM CO LTD
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