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Processing method of powder paint for coating composite material

A technology of polyester resin and nitrogen protection, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of high curing temperature, high functionality, and poor weather resistance of powder coatings, and achieve weather resistance and mechanical properties Excellent, low curing temperature, smooth appearance

Inactive Publication Date: 2018-09-04
黄山市向荣新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the polyester-TGIC system powder coating has problems such as high curing temperature and poor weather resistance, while the polyester-HAA system has problems such as easy moisture absorption and high leveling due to its high functionality and strong activity.

Method used

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  • Processing method of powder paint for coating composite material
  • Processing method of powder paint for coating composite material
  • Processing method of powder paint for coating composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: preparation and performance of polyester resin

[0019] 1. Preparation of polyester resin

[0020] Preparation method: raise the temperature of the reactor to 95°C, under the protection of nitrogen, add neopentyl glycol, 1,6-hexanediol, 1,4 cyclohexanediol, 1,4 cyclohexanedioic acid, cis-urethane Head acid, tartaric acid, germanium tetraiodide, and 1 part of trimethylolpropane, continue to heat up to 230°C under nitrogen protection, and keep warm for reaction until the system is clear and free of particles, and the acid value reaches 10-15mgKOH / g . Add silane coupling agent and terephthalic acid, raise the temperature to 280°C, continue to react under nitrogen protection until the acid value reaches 30-35mgKOH / g, then add tris(2,4-di-tert-butylphenyl)phosphorous acid 0.5 part of ester and 0.5 part of tetraethylammonium bromide, stir evenly, cool down to obtain polyester resin.

[0021] In each group, the weight of each group actually added is shown in T...

Embodiment 2

[0031] Embodiment 2: preparation and performance of powder coating

[0032] 1. Powder coating preparation:

[0033] The polyester resin prepared in Group 1 in Example 1 was selected.

[0034] In parts by weight, powder coating formula: 280 parts of polyester resin, 200-230 parts of TGIC, 5 parts of Resiflow PV88 (leveling agent), 3 parts of benzoin, 155 parts of titanium dioxide, and 155 parts of ultrafine barium (filler). The components in the above formula are mixed, extruded, pulverized and sieved to obtain the powder coating. The curing time is 15min.

[0035] The actual parameters of each group are shown in Table 3.

[0036] Table 3 Parameter conditions in each group

[0037] components

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Abstract

The invention belongs to the field of chemical materials, and particularly relates to a processing method of powder paint for coating a composite material. The preparation method of polyester resin comprises the following steps: heating a reaction kettle to 85 to 95 DEG C, and adding neopentyl glycol, 1,6-hexanediol, 1,4-cyclohexanediol, 1,4-cyclohexanedioic acid, cis-aconitic acid, tartaric acid,germanium tetraiodide and trimethylolpropane; heating to 230 DEG C, and reacting until an acid value reaches 10 to 15 mg KOH / g; and adding a silane coupling agent and terephthalic acid, heating to 280 DEG C, then adding tri(2,4-di-tert-butylphenyl)phosphite ester and tetraethylammonium bromide, uniformly stirring, and cooling, thus obtaining the polyester resin. The powder paint is prepared by adopting polyester resin as a raw material and prepared from 280 parts of polyester resin, 200 to 220 parts of TGIC, 5 parts of Resiflow PV88, 3 parts of benzoin, 155 parts of titanium dioxide and 155 parts of ultrafine barium. The powder paint provided by the invention is smooth in appearance, good in glossiness, excellent in weather resistance and mechanical performance and low in curing temperature.

Description

technical field [0001] The invention belongs to the field of chemical materials, and in particular relates to a processing method suitable for powder coatings for coating composite materials. Background technique [0002] Polyester resin powder coating is a new type of weather-resistant powder coating. At present, polyester-triglycidyl isocyanurate (TGIC) and polyester-hydroxyalkylamide (HAA) are the main two systems. Polyester resin powder coatings have good fluidity before curing, and the coating after film formation has the advantages of good leveling, high gloss, and high mechanical strength. Therefore, its market share in powder coatings is increasing year by year. [0003] However, the polyester-TGIC system powder coating has problems such as high curing temperature and poor weather resistance, while the polyester-HAA system has problems such as easy moisture absorption and high leveling due to its high functionality and strong activity. [0004] Therefore, it is of g...

Claims

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Application Information

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IPC IPC(8): C08G63/695C09D167/02C09D5/03C09D7/61C09D7/63
CPCC08G63/6956C08K2003/2241C08K2003/3045C09D5/03C09D5/033C09D167/02C08K3/22C08K3/30
Inventor 郑荣辉江蓉毕海鹏张齐冯小浩
Owner 黄山市向荣新材料有限公司
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