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TGIC (triglycidyl isocyanurate) cured polyester resin with high toughness and ultrahigh weather fastness for powder coating and preparation method of polyester resin

A technology of powder coating and polyester resin, which is applied in the direction of powder coating, polyester coating, coating, etc., which can solve the problems of unsuitable application in the field of powder coating, poor light resistance, and poor weather resistance, so as to increase hydrolysis resistance and excellent Water resistance, the effect of increasing bending ability

Inactive Publication Date: 2017-10-20
ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For polyester resins for high-toughness powder coatings, there are a small number of reports in the industry. For example, Chinese patent CN 103739830A discloses a TGIC-cured polyester resin for high-toughness powder coatings. The polyester resin introduces a large amount of adipic acid, sebacic acid, Long-chain aliphatic monomers such as azelaic acid, it can be inferred that the resin has excellent flexibility, but the long-chain aliphatic monomer contains a large amount of β-H, and there is no side chain protection, it can be inferred that the polyester resin is prone to "β - Elimination of reaction", poor light resistance and weather resistance; Chinese patent CN102627755B discloses a synthetic method of a semi-crystalline low-viscosity high-toughness polyester resin for powder coatings. The polyester resin adopts a large amount of terephthalic acid, ethyl alcohol Diol and other monomers, the synthesized structure has a high degree of symmetry, and the semi-crystalline structure will lead to the formation of shrinkage cavities in powder coatings. Therefore, it can be speculated that the polyester resin has excellent flexibility, but it is not suitable as a film-forming substance for powder coatings alone.
There are few reports in the industry on polyester resins for high-weather-resistant powder coatings, and there are a small number of reports in the field of liquid coatings. For example, Chinese patent CN 1887994A discloses a high-weather-resistant coating made of silicone resin and a preparation method thereof. Contains organic silicon intermediates, so it can be inferred that the coating provided by the report has excellent weather resistance, but the technical route provided by the invention contains a large amount of solvents, which cannot be applied in the field of powder coatings

Method used

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  • TGIC (triglycidyl isocyanurate) cured polyester resin with high toughness and ultrahigh weather fastness for powder coating and preparation method of polyester resin
  • TGIC (triglycidyl isocyanurate) cured polyester resin with high toughness and ultrahigh weather fastness for powder coating and preparation method of polyester resin
  • TGIC (triglycidyl isocyanurate) cured polyester resin with high toughness and ultrahigh weather fastness for powder coating and preparation method of polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment a

[0042]In a 3000ml four-neck flask equipped with a stirrer, condenser, thermometer and nitrogen protection, add 90 parts of 1,4-cyclohexanedimethanol, 60 parts of 2-ethyl-2-butyl-1, 3-propanediol, 665 parts of neopentyl glycol, 2 parts of monobutyltin oxide, 770 parts of terephthalic acid, 330 parts of isophthalic acid, nitrogen protection; Acetified water; continue to heat up to 240 ° C, when the water output of the esterified water reaches 95% of the theoretical value, sampling and detection, the acid value reaches 9-11.0mgKOH / g; add 200 parts of polyacid end-capping agent isophthalic acid, in Insulate and react for 240 minutes at 240℃~250℃; after the reaction is completed, take a sample and test, the value reaches 46.0~50.0mgKOH / g, polymerize under negative compression at -0.113~-0.095MPa for 1 hour, and negatively compress at -0.095~-0.099MPa Compress poly for 2 hours; cool down to 220°C, add 2 parts of antioxidant tris(2,4-di-tert-butylphenyl) phosphite and 0.1 part of cur...

Embodiment b

[0044] In a 3000ml four-neck flask equipped with a stirrer, condenser, thermometer and nitrogen protection, add 60 parts of 1,4-cyclohexanedimethanol, 60 parts of 2-ethyl-2-butyl-1, 3-propanediol, neopentyl glycol 700 parts, monobutyltin oxide 1.5 parts, stannous oxalate 0.5 parts, hydrogenated dimer acid 90 parts, terephthalic acid 660 parts, isophthalic acid 440 parts Formic acid, filled with nitrogen for protection; when the temperature rises to 175°C, esterification water begins to flow out; when the temperature continues to rise to 240°C, when the amount of esterification water reaches 95% of the theoretical value, sampling and testing shows that the acid value reaches 9-11.0mgKOH / g ; Add 200 parts of isophthalic acid, a polybasic acid end-capping agent, and keep it warm for 240 minutes at 240°C to 250°C; after the reaction is completed, take a sample for detection, and the value reaches 46.0 to 50.0mgKOH / g, at -0.113 to -0.095MPa Negative compression polymerization for 1...

Embodiment c

[0046] In a 3000ml four-neck flask equipped with a stirrer, condenser, thermometer and nitrogen protection, add 90 parts of 1,4-cyclohexanedimethanol, 120 parts of 2-ethyl-2-butyl-1, 3-propanediol, 645 parts of neopentyl glycol, 1 part of monobutyltin oxide, 1 part of stannous oxalate, 120 parts of hydrogenated dimer acid, 880 parts of terephthalic acid, 220 parts of isophthalic acid Formic acid, filled with nitrogen for protection; when the temperature rises to 175°C, esterification water begins to flow out; when the temperature continues to rise to 240°C, when the amount of esterification water reaches 95% of the theoretical value, sampling and testing shows that the acid value reaches 9-11.0mgKOH / g ; Add 200 parts of isophthalic acid, a polybasic acid end-capping agent, and keep it warm for 240 minutes at 240°C to 250°C; after the reaction is completed, take a sample for detection, and the value reaches 46.0 to 50.0mgKOH / g, at -0.113 to -0.095MPa Negative compression polyme...

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Abstract

The invention relates to TGIC (triglycidyl isocyanurate) cured polyester resin with high toughness and ultrahigh weather fastness for a powder coating and a preparation method of polyester resin in order to realize that polyester resin has higher glass-transition temperature and a prepared powder coating film has excellent dynamic mechanical properties, high surface decoration performance and ultrahigh weather fastness. According to the technical scheme, TGIC cured polyester resin with high toughness and ultrahigh weather fastness for the powder coating is prepared from following raw materials through melt condensation polymerization: polyalcohol, polyacid, an acidulate agent, an esterification catalyst, an antioxidant and a curing accelerator. The preparation method of the TGIC cured polyester resin with high toughness and ultrahigh weather fastness for the powder coating comprises steps as follows: 1), required polyalcohol is added to a reaction kettle according to the proportion, the temperature is rapidly increased, and esterified water is produced and distilled off; 2), the temperature is increased step by step, and materials keep clear; 3), a sample is taken for detection; 4), negative-pressure condensation polymerization is performed; 5), the temperature is reduced, the antioxidant and the curing accelerator are added, and a mixture is cooled and discharged after being stirred and dispersed.

Description

technical field [0001] The invention relates to a polyester resin for powder and a preparation method thereof, in particular to a polyester resin for TGIC curing powder coating with high toughness and ultra-high weather resistance and a preparation method thereof. Background technique [0002] Powder coating is a new type of solvent-free green coating composed of polyester resin, curing agent, pigments and fillers and additives. Because of its excellent surface decoration and protection properties, it has gradually become one of the mainstream coating categories. However, powder coatings also have obvious defects, such as the difficulty of recoating powder coatings, and the film thickness of powder coatings is several times that of liquid coatings. These technical difficulties limit the application fields of powder coatings. In recent years, the most obvious systematic defects of powder coatings are short service life and poor weather resistance of powder coatings. The avera...

Claims

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Application Information

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IPC IPC(8): C08G63/199C08G63/85C09D167/02C09D5/03
CPCC08G63/199C08G63/85C09D5/03C09D167/02
Inventor 汤明麟应明友黄志钱石嫚嫚储坚刚
Owner ZHEJIANG CHUANHUA TIANSONG NEW MATERIAL CO LTD
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