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Epoxy cured polyester resin used for powdery paint having high surface decorative performance and high water resistance and preparation method thereof

A powder coating and polyester resin technology, applied in the field of polyester resin, can solve the problems of reducing the chemical storage stability of powder coatings, reducing the surface decoration performance of powder coatings, poor water resistance of powder coatings, etc., achieving excellent dynamic mechanical properties, Excellent color and high water resistance

Active Publication Date: 2017-10-17
ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder coating of polyester-epoxy system has the characteristics of low manufacturing cost and excellent surface decoration performance, and has broad market prospects. There are also related reports in the industry: as Chinese patent CN 102516512A discloses a 70 / 30 type high TG mixed type The preparation method of polyester resin, the polyester resin is blocked by a large amount of 1,6-adipic acid, it is speculated that the powder coating prepared by the polyester resin has good mechanical properties, but the weather resistance performance is reduced to a certain extent; the patent discloses The polyester resin synthesis process to improve the leveling performance is to reduce the vacuum temperature and prolong the vacuum time. It is speculated that the powder coating prepared by the polyester resin has good surface decoration performance, but because the oligomers in the polyester resin cannot be completely removed at low temperature Therefore, the solvent resistance will decrease to a certain extent; Chinese patent CN 102417590A discloses a preparation method of a 60 / 40 type high TG hybrid polyester resin, the polyester resin uses a certain proportion of chain extenders, and it is speculated that the polymer The powder coating prepared by ester resin has good water resistance, but the highly branched structure will reduce the surface decoration performance of powder coating; Adjust the curing system and add additives to reduce the viscosity. It is speculated that the powder coating prepared by the polyester resin can be cured at low temperature, but the use of additives that reduce the viscosity will reduce the chemical storage stability of the powder coating
[0004] Both epoxy resin and polyester resin contain hydrophilic groups. The powder coating of epoxy-polyester system has hydrophilicity in molecular structure, and the ester bond is easy to hydrolyze. Therefore, the water resistance of powder coating of epoxy-polyester system Poor, there is no relevant report in the industry on polyester resins for epoxy-cured coatings with high surface decoration and high water resistance

Method used

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  • Epoxy cured polyester resin used for powdery paint having high surface decorative performance and high water resistance and preparation method thereof
  • Epoxy cured polyester resin used for powdery paint having high surface decorative performance and high water resistance and preparation method thereof
  • Epoxy cured polyester resin used for powdery paint having high surface decorative performance and high water resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment a

[0041] In a 3000ml four-neck flask equipped with a stirrer, condenser, thermometer and nitrogen protection, add 120 parts of diethylene glycol, 85 parts of ethylene glycol, 287 parts of neopentyl glycol, 180 parts of 2-methyl Base 1,3-propanediol, 3 parts of tetraisopropyl titanate, 1100 parts of terephthalic acid, 30 parts of 1,6-adipic acid, 20 parts of isophthalic acid, nitrogen protection; when the temperature rises At 160°C, esterification water begins to flow out; continue to heat up to 250°C, and when the amount of esterification water reaches 95% of the theoretical value, take a sample and test, and the acid value reaches 18.0-24.0mgKOH / g; add polyacid end-capping agent 1 , 80 parts of 2,4-benzenetricarboxylic anhydride, heat preservation and reaction at 240°C-250°C for 40-50 minutes; after the reaction was completed, the acid value reached 46.0-52.0mgKOH / g, at -0.113~-0.095MPa Negative compression polymerization for 1 hour, negative compression polymerization at -0.09...

Embodiment b

[0043] In a 3000ml four-neck flask equipped with a stirrer, condenser, thermometer and nitrogen protection, add 120 parts of diethylene glycol, 85 parts of ethylene glycol, 295 parts of neopentyl glycol, 180 parts of 2-methyl 1,3-propanediol, 1.5 parts of tetraisopropyl titanate, 1.5 parts of stannous oxalate, 30 parts of hydrogenated dimer acid, 1100 parts of terephthalic acid, 30 parts of 1,6-adipic acid , 20 parts of isophthalic acid, filled with nitrogen for protection; when the temperature rises to 160°C, esterification water begins to flow out; when the temperature continues to rise to 250°C, when the amount of esterification water effluent reaches 95% of the theoretical value, sampling and testing, the acid value Reach 18.0-24.0mgKOH / g; add 80 parts of polybasic acid end-capping agent 1,2,4-benzenetricarboxylic anhydride, keep warm and react for 40-50 minutes at 240℃~250℃; Reach 46.0~52.0mgKOH / g, polymerize under negative compression at -0.113~-0.095MPa for 1 hour, and ...

Embodiment c

[0045] In a 3000ml four-neck flask equipped with a stirrer, condenser, thermometer and nitrogen protection, add 120 parts of diethylene glycol, 85 parts of ethylene glycol, 308 parts of neopentyl glycol, 180 parts of 2-methyl 1,3-propanediol, 3 parts of stannous oxalate, 60 parts of hydrogenated dimer acid, 1100 parts of terephthalic acid, 30 parts of 1,6-adipic acid, 20 parts of isophthalic acid, full Nitrogen protection; when the temperature rises to 160°C, esterification water begins to flow; when the temperature continues to rise to 250°C, when the amount of esterification water reaches 95% of the theoretical value, sampling and testing shows that the acid value reaches 18.0-24.0mgKOH / g; add multi-component 80 parts of acid-blocking agent 1,2,4-benzenetricarboxylic anhydride, heat preservation reaction at 240°C-250°C for 40-50 minutes; Negative compression polymerization at 0.113~-0.095MPa for 1 hour, negative compression polymerization at -0.095~-0.099MPa for 1 hour; cool...

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Abstract

The invention relates to epoxy cured polyester resin used for a powdery paint having high surface decorative performance and high water resistance and a preparation method thereof. The provided polyester resin has appropriate glass-transition temperature, a prepared powdery paint film has excellent dynamic mechanical properties, high surface decoration performance and high water resistance. The polyester resin is prepared by melt phase polycondensation of the raw materials of polyol, polyprotic acid, an acidulate agent, an esterification catalyst, an anti-oxidant and a curing accelerator. The method of the polyester resin comprises the following steps: 1) the polyol is delivered into a reaction kettle at a needed ratio, rapid heating esterification is carried out, water is generated, and is removed via distillation; 2) temperature is increased gradually, and an obtained material is maintained to be clear; 3) sample examination is carried out; 4) negative pressure polycondensation is carried out; and 5) cooling is carried out, the antioxidant and the curing accelerator are added, stirring dispersing is carried out, and an obtained product is cooled, and is collected.

Description

technical field [0001] The invention relates to a polyester resin, especially an epoxy-cured polyester resin for powder coatings with high surface decoration and high water resistance, and also relates to a preparation method of the polyester resin. Background technique [0002] Powder coating is an environment-friendly green coating with superior performance, high efficiency and no organic solvent. It is widely used in building materials, electrical appliances and home decoration. According to the different curing systems of powder coatings, it is mainly divided into: 1) Powder coatings cured by triglycidyl isocyanurate (TGIC). This type of powder coatings is mainly used in outdoor building materials and has excellent water resistance and weather resistance. , the disadvantage is that TGIC has reproductive toxicity; 2) powder coating cured by β-hydroxyalkylamide (HAA), which is mainly used in home appliances, has the characteristics of environmental friendliness and no toxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/02C09D5/03C09D7/12C08G63/672C08G63/85
CPCC08G63/672C08G63/85C09D5/03C09D167/02
Inventor 汤明麟应明友邱锋利章道军廖萍
Owner ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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