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Hydroxyl terminated polyester resin for powder paint, preparation method and prepared powder paint

A hydroxyl-terminated polyester and powder coating technology, applied in the polymer field, can solve the problems of poor mechanical properties, poor dispersion of titanium dioxide, and high dosage, and achieve the effects of reducing the amount of addition, superior mechanical properties, and reducing costs.

Inactive Publication Date: 2018-04-27
广东依斯特新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a hydroxyl-terminated polyester resin for powder coatings, which can improve the problems of poor dispersibility, large dosage and poor mechanical properties of titanium dioxide in the production of thermosetting powder coatings

Method used

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  • Hydroxyl terminated polyester resin for powder paint, preparation method and prepared powder paint
  • Hydroxyl terminated polyester resin for powder paint, preparation method and prepared powder paint
  • Hydroxyl terminated polyester resin for powder paint, preparation method and prepared powder paint

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preparation example Construction

[0029] The titanium dioxide is rutile titanium dioxide or anatase titanium dioxide. Prepare the preparation method of hydroxyl-terminated polyester resin for powder coating as above, it comprises the following steps:

[0030] (1) Add the described polyhydric alcohol and branching agent of proportioning amount in reactor, heat up, then add described aromatic polyacid, fatty polyacid, inorganic pigment and catalyst of proportioning amount successively, pass into nitrogen and continue to heat up At 250°C, react for 5-12 hours until 95% of the esterified water is discharged, and the acid value reaches 8-20 mgKOH / g;

[0031] (2) Add the acidolysis agent of polyester ratio in the reaction kettle, react for 1-7 hours, until the acid value reaches 27-70mgKOH / g, vacuum polycondensation, the polycondensation time is 0.5-2 hours, make its viscosity reach 2500-6500mPa·s, and then perform a capping reaction for 0.5-3 hours to obtain the hydroxyl-terminated polyester resin with a molecular...

Embodiment 1

[0033] The hydroxyl-terminated polyester resin includes the following components, each component is by weight percentage: neopentyl glycol 10%, isophthalic acid 60%, adipic acid 1%, trimethylolpropane 1.5%, 1.4- Cyclohexanedicarboxylic acid 27.2%, monobutyltin oxide 0.1%, titanium dioxide 0.2%.

[0034] The hydroxyl-terminated polyester resin prepared according to the above steps and components is used to prepare powder coatings. The powder coatings are white and suitable for indoor use. The composition of the powder coatings includes: the 30kg of hydroxyl-terminated polyester resin; epoxy resin at 0.12mol / 100g epoxy resin 30kg; leveling agent 1kg, brightener 1kg, benzoin 0.5kg; barium sulfate 20kg, the barium sulfate is preferably precipitated barium or ultrafine barium ; Titanium dioxide 12.5kg, said titanium dioxide is preferably rutile titanium dioxide; Ultramarine 0.08kg.

Embodiment 2

[0036] The hydroxyl-terminated polyester resin includes the following components, each component is by weight percentage: 22% neopentyl glycol, 50% isophthalic acid, 4% adipic acid, 1% trimethylolpropane, 1.4- Cyclohexanedicarboxylic acid 22.5%, monobutyltin oxide 0.1%, titanium dioxide 0.4%.

[0037] The hydroxyl-terminated polyester resin prepared according to the above steps is used to prepare a powder coating. The powder coating is white and suitable for outdoor use. Its composition includes: 30 kg of the hydroxyl-terminated polyester resin with an acid value of about 32 mgKOH / g; TGIC curing agent 4.2kg; Leveling agent 1kg, brightener 1kg, benzoin 0.5kg; Barium sulfate 20kg, described barium sulfate is preferably precipitated barium or ultrafine barium; Titanium dioxide 12.5kg, described titanium dioxide is preferably rutile type titanium white powder; ultramarine 0.08kg.

[0038] The formula of hydroxyl-terminated polyester resin prepared by the present invention and pol...

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Abstract

Belonging to the field of polymer technology, the invention discloses a hydroxyl terminated polyester resin for powder paint. The hydroxyl terminated polyester resin for powder paint comprises the following components by weight percentage: 10%-40% of polyol, 30%-70% of aromatic polybasic acid, 0%-5% of fatty polybasic acid, 0%-2% of a branching agent, 3%-30% of an acidolysis agent, 0.05%-0.2% of an esterification catalyst, and 0.01%-0.4% of inorganic pigment. The components are subjected to melting esterification, and then polycondensation reaction is carried out to obtain the hydroxyl terminated polyester resin. The invention also discloses a preparation method of the hydroxyl terminated polyester resin and the powder paint prepared by from the hydroxyl terminated polyester resin. The hydroxyl terminated polyester resin provided by the invention can improve the problems of poor dispersity of titanium dioxide and large dosage in production of thermosetting powder paint, and can lower the cost.

Description

technical field [0001] The invention relates to the technical field of macromolecules, in particular to a hydroxyl-terminated polyester resin for powder coatings. Background technique [0002] Thermosetting powder coatings are composed of reactive film-forming mixtures (resin and crosslinking agent) with pigments, fillers, leveling agents, antistatic agents and appropriate accelerators, mixed in an extruder at reaction temperature, extruded, The powder particles obtained by cooling, crushing, pulverizing and sieving thermosetting powder coatings are widely used resins such as epoxy resins, polyester resins and acrylic resins, and the commonly used polyester resins are polyester resins with hydroxyl groups. In the preparation process of thermosetting powder coatings, pigments and fillers, such as titanium dioxide, are often added, and then the coatings are prepared by dry mixing physical methods. The thermosetting powder coatings in the prior art have the problem of uneven d...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/78C09D167/02C09D163/00C09D5/03C09D7/61
CPCC08G63/20C08G63/78C08K2003/2241C09D5/035C09D163/00C09D167/02C08L63/00C08K3/22C08L67/02
Inventor 游东升谢小文徐素亚
Owner 广东依斯特新材料有限公司
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