Excellent boiling-resistant and neutral-salt-mist-resistant polyester resin for low-temperature curing type powder and preparation method thereof

A technology of polyester resin and water boiling resistance, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of water boiling resistance, neutral salt spray resistance, and inability to cure at low temperature with TGIC system, achieving outstanding performance Boiling resistance and neutral salt spray resistance, excellent boiling resistance and high activity

Active Publication Date: 2020-02-18
HUANGSHAN HUIZHOU KANGJIA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned invention achieves high cross-linking density by increasing the functionality, and then obtains better high-temperature resistance, but the

Method used

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  • Excellent boiling-resistant and neutral-salt-mist-resistant polyester resin for low-temperature curing type powder and preparation method thereof
  • Excellent boiling-resistant and neutral-salt-mist-resistant polyester resin for low-temperature curing type powder and preparation method thereof
  • Excellent boiling-resistant and neutral-salt-mist-resistant polyester resin for low-temperature curing type powder and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0037] Example 1

[0038] The preparation method of polyester resin for TGIC type powder coating resistant to boiling and neutral salt spray includes the following steps:

[0039] (1) Prepare each raw material, and the amount of each raw material is shown in Table 1. Add the catalyst zinc acetate, 1H, 1H, 12H, 12H-perfluoro-1,12-dodecanediol, terephthalic acid, and dodecenyl succinic anhydride into the reactor at a rate of 20°C / h Gradually increase the temperature to 150°C and keep it for 6 hours; then increase it to 190°C at a rate of 10°C / h and keep it for 5 hours;

[0040] (2) When the acid value of the reactant is 55mgKOH / g, add neopentyl glycol and isophthalic acid to the reaction kettle to carry out a sufficient esterification polymerization reaction, and slowly increase the temperature to 220°C at a rate of 7°C / h. Insulate and continue the polymerization reaction for 6 hours;

[0041] (3) When the acid value of the reactant is 55 mgKOH / g, the temperature is lowered to 210°C, ...

Example Embodiment

[0064] Example 5

[0065] The formula of high acid value TGIC system powder coating is usually as follows in parts by weight:

[0066]

[0067]

[0068] Coating preparation: according to the formula of high acid value TGIC powder coating, the materials are mixed uniformly, extruded with a twin-screw extruder, tableted, crushed, and then the flakes are crushed and screened to make the powder coating. The powder coating is sprayed on the surface-treated aluminum plate with an electrostatic spray gun, and cured quickly at 150°C / 15min to obtain a powder coating coating.

[0069] Coating index testing is based on GB / T 21776-2008 "Powder Coatings and Coating Testing Standard Guide"; water boiling resistance test GB 5237.4-2008 "Aluminum Alloy Building Profile Part 4 Powder Coating Profile" in section 5.4.10; The neutral salt spray resistance test is based on GB / T 1771-91 "Determination of the neutral salt spray resistance of paints and varnishes".

[0070] Table 3 The basic properties of t...

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Abstract

The invention belongs to the technical field of resin for coatings, particularly relates to excellent boiling-resistant and neutral-salt-mist-resistant polyester resin for a TGIC system low-temperature curing type powder coating, and further relates to a preparation method of the polyester resin. The excellent boiling-resistant and neutral-salt-mist-resistant polyester resin for the TGIC system low-temperature curing type powder coating is mainly prepared from the following raw materials in parts by mole through a polymerization reaction: 8-20 parts of terephthalic acid, 12-25 parts of dodecenyl succinic anhydride, 6-15 parts of isophthalic acid, 12-28 parts of 1H, 1H, 12H, 12H-perfluoro-1,12- dodecanediol, 7-18 parts of neopentyl glycol, 8-20 parts of 2, 2, 3, 3-tetrafluoro-1, 4-butanediol and 5-10 parts of 2, 2-difluoromalonic acid. The TGIC system powder coating finally prepared by the product disclosed by the invention can realize 150 DEG C/15min low-temperature curing film formation, the coating quality meets the requirements of a powder coating film, and the coating film has outstanding boiling resistance and neutral salt mist resistance.

Description

technical field [0001] The invention belongs to the technical field of resins used in coatings, and in particular relates to a polyester resin for TGIC system low-temperature curing powder coatings with excellent water boiling resistance and neutral salt spray, and also relates to a preparation method of the polyester resin. Background technique [0002] TGIC-type powder coatings are outdoor weather-resistant powder coatings. After staying up late outdoors and experiencing harsh conditions such as rain, the requirements for water resistance of the coating film are relatively high. Water-resistant polyester resins must be used to prepare powder coatings. In recent years, with the improvement of environmental protection and energy saving requirements, there have been more researches on the low-temperature curing of powder coatings, but these low-temperature curing powder coatings mostly use ordinary flexible alcohols and acids. While curing at low temperature to form a coating...

Claims

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Application Information

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IPC IPC(8): C08G63/682C08G63/56C08G63/78C08G63/91C09D167/02C09D5/03
CPCC08G63/56C08G63/6828C08G63/78C08G63/918C08K2003/2241C08K2003/3045C09D5/03C09D167/02C08K13/02C08K3/22C08K3/30C08K5/34924C08K5/07
Inventor 周勇李海云洪杰吴泽凯汪利华谭卫东洪昭武
Owner HUANGSHAN HUIZHOU KANGJIA CHEM CO LTD
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