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Low-temperature curing type polyester resin for powder coating and preparation method of low-temperature curing type polyester resin

A polyester resin and powder coating technology, applied in powder coatings and other directions, can solve the problems of long curing time of polyester resin and the storage stability of powder coatings needs to be improved, and achieve the effects of reducing energy consumption, good stability and high activity

Active Publication Date: 2018-09-07
HUANGSHAN ZHENGJIE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the curing time of the polyester resin prepared by the invention is relatively long, generally more than 30 minutes, and an additional curing accelerator is required when preparing the powder coating, resulting in the storage stability of the powder coating to be improved

Method used

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  • Low-temperature curing type polyester resin for powder coating and preparation method of low-temperature curing type polyester resin
  • Low-temperature curing type polyester resin for powder coating and preparation method of low-temperature curing type polyester resin
  • Low-temperature curing type polyester resin for powder coating and preparation method of low-temperature curing type polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A kind of low-temperature curing type 60:40 polyester resin for powder coating, its raw material composition and molar ratio are:

[0059]

[0060] The preparation method of above-mentioned polyester resin comprises the following steps:

[0061] A. Add the formulated amount of phthalic acid, tridecanedioic acid, diethyl terephthalate, and 1,3,5-cyclohexanetriic acid monoester into the mixer, and heat and melt at 135°C ;

[0062] B. Add tetraethylene glycol and 2,4,7,9-tetramethyl-5-decyne-4,7-diol in the formula amount to the above mixed material, and add dioctyltin oxide as a catalyst at the same time, Under the protection of nitrogen, gradually raise the temperature to 185°C, then add the formula amount of DL-malic acid, slowly raise the temperature until no obvious distillate is distilled out, and the acid value of the reactant is less than 30mgKOH / g; the reaction temperature should not exceed 245 ℃;

[0063] C, add antioxidant 618 (dioctadecyl pentaerythritol ...

Embodiment 2

[0067] A kind of low-temperature curing type 60:40 polyester resin for powder coating, its raw material composition and molar ratio are:

[0068]

[0069] The preparation method of above-mentioned polyester resin comprises the following steps:

[0070] A. Add the formulated amount of phthalic acid, tridecanedioic acid, diethyl terephthalate, and 1,3,5-cyclohexanetriic acid monoester into the mixer, and heat and melt below 135°C ;

[0071] B. Add tetraethylene glycol and 2,4,7,9-tetramethyl-5-decyne-4,7-diol in the formula amount to the above mixed material, and add dioctyltin oxide as a catalyst at the same time, Under the protection of nitrogen, gradually raise the temperature to 185°C, then add the formula amount of DL-malic acid, slowly raise the temperature until no obvious distillate is distilled out, and the acid value of the reactant is less than 30mgKOH / g; the reaction temperature should not exceed 245 ℃;

[0072] C, add antioxidant 618 (dioctadecyl pentaerythrit...

Embodiment 3

[0076] A kind of low-temperature curing type 60:40 polyester resin for powder coating, its raw material composition and molar ratio are:

[0077]

[0078] The preparation method of above-mentioned polyester resin comprises the following steps:

[0079] A. Add the formulated amount of phthalic acid, tridecanedioic acid, diethyl terephthalate, and 1,3,5-cyclohexanetriic acid monoester into the mixer, and heat and melt below 135°C ;

[0080] B. Add tetraethylene glycol and 2,4,7,9-tetramethyl-5-decyne-4,7-diol in the formula amount to the above mixed material, and add dioctyltin oxide as a catalyst at the same time, Under the protection of nitrogen, gradually raise the temperature to 185°C, then add the formula amount of DL-malic acid, slowly raise the temperature until no obvious distillate is distilled out, and the acid value of the reactant is less than 30mgKOH / g; the reaction temperature should not exceed 245 ℃;

[0081] C, add antioxidant 618 (dioctadecyl pentaerythrit...

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Abstract

The invention provides low-temperature curing type polyester resin for a powder coating and a preparation method of the low-temperature curing type polyester resin. The polyester resin is prepared from 1,2-phenylenediacetic acid, brassylic acid, diethyl terephthalate, 1,3,5-cyclohexanetricarboxylic acid mono-amidate, tetraethylene glycol, 2,4,7,9-tetramethyl-5-decyne-4,7-diol, DL-malic acid and ethylenediamine tetraacetic acid as main raw materials through copolymerization. The polyester resin contains imidazole catalytic functional groups in chain segments, so that a low-temperature curing accelerator is not required to be added, the polyester resin and the powder coating prepared from the same can be good in stability, the powder coating prepared from the polyester resin can be subjectedto low-temperature curing at 150 DEG C, a cured film is excellent, and the powder coating has good levelling property.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, in particular to a low-temperature curing 60:40 polyester resin for powder coatings and a preparation method thereof. Background technique [0002] Powder coating is a new type of solvent-free 100% solid powder coating. Powder coating is a completely different form from general coatings, and it exists in the state of fine powder. Because no solvent is used, it is called powder coating. Powder coating has the characteristics of solvent-free, pollution-free, recyclable, environmental protection, energy and resource saving, labor intensity reduction and high mechanical strength of the coating film. [0003] There are two types of powder coatings: thermoplastic powder coatings and thermosetting powder coatings. Thermoplastic powder coatings are composed of thermoplastic resins, pigments, fillers, plasticizers and stabilizers. Thermoplastic powder coatings include: polyethylene, polypropyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/03C08G63/685C08G63/199C08G63/181
CPCC08G63/181C08G63/199C08G63/6856C09D5/03
Inventor 江建明胡泽湘程明光江兴科吴湧泉闫四平钱立焱
Owner HUANGSHAN ZHENGJIE NEW MATERIALS
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