Polyester resin for high-performance aqueous coating and preparation method thereof

A water-based coating and polyester resin technology, applied in polyester coatings, coatings, etc., can solve the problems of polyester resin water resistance, poor storage stability, poor water resistance, etc., to achieve good leveling performance, excellent water resistance Good cooking effect and storage stability

Active Publication Date: 2012-06-27
GUANGZHOU KINTE IND
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In addition, the patent 200710045920 uses pyromellitic anhydride instead of trimellitic anhydride to synthesize a water-based resin with a lower viscosity, but the acid used in the monomer contains phthalic acid, because the water resistance of phthalic acid itself is relatively poor, so Causes the water resistance of the synthetic polyester resin to be affected
At present, the water-based polyester coatings on the market often encounter poor water resistance and poor storage stability during use.

Method used

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  • Polyester resin for high-performance aqueous coating and preparation method thereof
  • Polyester resin for high-performance aqueous coating and preparation method thereof

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Embodiment Construction

[0024] Specific implementation examples

[0025] Some specific examples are enumerated below to illustrate the present invention. Table 1 is an example of polyester resin, and A to F are comparative examples of different monomers and process combinations. Add neopentyl glycol, 2-ethyl-2-butyl-1,3-propanediol, ethylene glycol and trimethylolpropane in the ratio listed in Table 1 into the reactor, and heat up until the material melts; then Add isophthalic acid, terephthalic acid, adipic acid, 1,4-cyclohexanedicarboxylic acid and dibutyltin oxide in sequence, and continue to heat up the reaction with nitrogen gas. At about 180°C, esterified water begins to form and distills out. Then gradually raise the temperature to 240°C, react for 5-10 hours until 95% of the esterified water is discharged, the acid value reaches 2-5mgKOH / g, cool down to 185°C, add acidolysis agent and react for 0.5-1h, then detect the acid value and Viscosity, when the acid value reaches 15~60mgKOH / g, and t...

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Abstract

The invention discloses polyester resin for a high-performance aqueous coating. The polyester resin is prepared by mainly carrying out melt polycondensation reaction on the following raw materials in percentage by weight: 25-70% of polylol, 1-20% of branching agent, 20-35% of aromatic polybasic acid, 5-20% of fat polybasic acid, 3-15% of acidolysis agent and 0.005-0.15% of esterification catalyst. The invention further discloses a preparation method of the polyester resin. The polyester resin provided by the invention is low in viscosity and good in storage stability, the adopted process is simple and feasible, and the polyester resin is used in a polyester resin/aqueous amino resin curing system; and the prepared aqueous coating has the advantages of excellent water-fast resistance, high glaze and excellent mechanical properties.

Description

technical field [0001] The invention relates to a polyester resin for coatings and a preparation method thereof, in particular to a polyester resin for high-performance water-based coatings and a preparation method thereof. technical background [0002] With the restrictions on VOC by laws and regulations in various countries and the enhancement of people's awareness of environmental protection, environmentally friendly coatings are getting more and more attention from the market. As an environmentally friendly coating, water-based coatings do not require special construction equipment, and have a wide range of applications, and have been widely used. Water-based polyester coatings are a representative type of water-based coatings with excellent comprehensive performance. They are widely used in the protection and decoration of metal and wood surfaces. They have the characteristics of high gloss, strong adhesion, high fullness, and excellent impact resistance. However, bec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/78C09D167/02
Inventor 何涛顾宇昕曾定万貂周年忠
Owner GUANGZHOU KINTE IND
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