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Hydroxyl terminated polyester resin used for powder coating, preparation method and powder coating prepared from hydroxyl terminated polyester resin

A technology of hydroxyl-terminated polyester and powder coatings, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of poor weather resistance and unfavorable promotion, and achieve low cost, excellent water boiling resistance, and good leveling performance Effect

Inactive Publication Date: 2018-11-30
ZHONGSHAN LVLANG ADDITIVES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The patent document with the application number CN 201710908598.8 specifically relates to a hydroxyl-terminated polyester resin for powder coatings and its preparation method. A large amount of monomers with poor weather resistance such as ethylene glycol and diethylene glycol are used as raw materials, which is not conducive to market promotion.

Method used

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  • Hydroxyl terminated polyester resin used for powder coating, preparation method and powder coating prepared from hydroxyl terminated polyester resin
  • Hydroxyl terminated polyester resin used for powder coating, preparation method and powder coating prepared from hydroxyl terminated polyester resin

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preparation example Construction

[0048] The invention also discloses a method for preparing a hydroxyl-terminated polyester resin for powder coatings, the specific steps are as follows:

[0049] (1) Weighing raw materials: Weighing raw materials according to the above ratio for later use;

[0050] (2) Esterification process: Add aromatic polyacids, polyols, branching agents and esterification catalysts into the synthesis reaction vessel. After sealing the kettle, gradually heat up the reaction in a nitrogen atmosphere, and then take samples for testing. The acid value is 5~ 10mgKOH / g;

[0051] (3) Vacuum process: add an antioxidant to the reactants obtained in the esterification process, and lower the temperature of the synthesis reaction vessel to 190~210°C, keep warm, vacuumize, and carry out the reaction at a vacuum degree of -0.096~-0.098MPa until the reactant reaches an acid value of 0.5~3mgKOH / g and a viscosity of 2800~3000mPa•s;

[0052] (4) Adding additives process: lower the temperature of the kett...

Embodiment 1

[0057] A hydroxyl-terminated polyester resin for powder coatings, which is prepared from the following raw material ratios: 32 parts of polyols, 46 parts of aromatic polybasic acids, 0.05 parts of branching agents, 0.1 parts of esterification catalysts, 0.12 parts of antioxidants, and inorganic pigments 0.05 parts, 0.22 parts of curing accelerator; the polyol is 2-ethyl-2-butyl-1,3 propanediol, the aromatic polyacid is terephthalic acid, and the branching agent is trimethylolpropane and trimethylol A mixture of ethane, and the antioxidant is a hindered phenolic antioxidant.

Embodiment 2

[0059] A hydroxyl-terminated polyester resin for powder coatings, which is prepared from the following raw material ratios: 35 parts of polyols, 46 parts of aromatic polyacids, 0.05 parts of branching agents, 0.12 parts of esterification catalysts, 0.11 parts of antioxidants, and inorganic pigments 0.06 parts and 0.24 parts of curing accelerator; wherein the polyhydric alcohol is neopentyl glycol, the aromatic polyacid is isophthalic acid, the branching agent is glycerol, and the antioxidant is a phosphite antioxidant.

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Abstract

The invention discloses hydroxyl terminated polyester resin used for a powder coating, and belongs to the technical field of polymers. The hydroxyl terminated polyester resin is prepared from the following raw materials in parts: 30-45 parts of a polyhydric alcohol, 45-55 parts of an aromatic polybasic acid, 0.01-2 parts of a branching agent, 0.1-0.15 part of an esterification catalyst, 0.1-0.15 part of an antioxidant, 0.01-0.2 part of an inorganic pigment, and 0.2-0.3 part of a curing accelerant. The hydroxyl terminated polyester resin is obtained by performing melt esterification on the above components and performing a polycondensation reaction. The invention also discloses a preparation method of the hydroxyl terminated polyester resin and the powder coating prepared from the hydroxylterminated polyester resin. According to the method disclosed by the invention, the hydroxyl terminated polyester resin used for the powder coating prepared by the method not only has lower melt viscosity and a lower free-carboxyl content, but also has good storage stability; and the prepared powder coating is non-toxic and environmentally-friendly, has good levelling performance and weather resistance, is suitable for industrial large-scale production, and has great market application and promotion value.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a hydroxyl-terminated polyester resin for powder coatings, a preparation method and prepared powder coatings. Background technique [0002] Compared with traditional liquid coatings, powder coatings promote the rapid development of the powder coatings industry with its outdoor features of economy, environmental protection, high efficiency, energy saving and excellent comprehensive performance. Since the advent of powder coatings in the early 1970s, its application in metal building materials has grown rapidly, because most of the powder coatings are used for outdoor painting and decoration, and often encounter severe weather, wind and rain. , sun exposure. This requires that the coating film of the powder coating has good water resistance and weather resistance, so that the coating does not blister, has good gloss retention and does not fade. [0003] At present, m...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/78C09D167/02C09D5/03C09D7/61
CPCC08G63/20C08G63/78C09D5/033C09D167/02
Inventor 李保卫孙栓李宗科
Owner ZHONGSHAN LVLANG ADDITIVES CO LTD
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