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Long-acting weather-resistant, chlorine-salt corrosion-resistant polyester powder coating and preparation method thereof

A polyester powder and powder coating technology, applied in powder coatings, polyester coatings, anti-corrosion coatings, etc., can solve the problems of guardrails, bridges, low cross-linking density, poor water resistance and inorganic salt penetration resistance, etc. Achieve long-term weather resistance and chlorine salt corrosion resistance, good linear structure and high curing activity

Active Publication Date: 2021-11-16
安徽鑫友高分子新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the low cross-linking density of the above-mentioned powder coatings, the poor ability of water resistance and inorganic salt penetration resistance, the purpose of improving the above-mentioned weather resistance is mainly achieved through the cooperation between the aging resistance agent modified by graphene and the polyester resin. Solve the problems existing in the existing highway guardrails and bridges, and there are few literature disclosures about solving the above-mentioned weather resistance and chlorine salt corrosion technical problems by improving polyester resin

Method used

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  • Long-acting weather-resistant, chlorine-salt corrosion-resistant polyester powder coating and preparation method thereof
  • Long-acting weather-resistant, chlorine-salt corrosion-resistant polyester powder coating and preparation method thereof
  • Long-acting weather-resistant, chlorine-salt corrosion-resistant polyester powder coating and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The preparation method of long-term weather-resistant and chloride-resistant polyester powder coating comprises the following steps:

[0055] S1: Add TGIC and triglycidyl trimesate in the formula amount into the reaction kettle, gradually heat to 107°C, after the material is completely melted, stir to make it mix and react for 30min, discharge while hot, cool and pulverize into 60 To obtain modified curing agent powder;

[0056] S2: the modified curing agent powder obtained in S1 and the polyester resin of the formula amount are weighed into the high-speed mixer, start the mixing device, and mix at a high speed for about 20min;

[0057] S3: after the main raw material in S2 is mixed uniformly, it is added in the twin-screw extruder to carry out melt extrusion, the temperature of the extrusion section is about 125 ° C, and the screw speed is 545 rpm; then cooled and broken into 4mm particles to obtain an extruded material ;

[0058] S4: add the titanium dioxide, barium...

Embodiment 5

[0079] Preparation of paint coating: The prepared powder coating is sprayed on the surface-treated tinplate substrate with an electrostatic spray gun, with a film thickness of about 120 μm, and is fully cured at 160°C / 20min to obtain a paint coating.

[0080] Coating index testing is based on GB / T 21776-2008 "Guidelines for Testing Standards for Powder Coatings and Their Coatings"; weather resistance testing is based on GB / T 1865-2009 "Artificial Weathering and Artificial Radiation Exposure Filtered Xenon for Paints and Varnishes" The artificial weathering test was carried out continuously for 700h according to the procedures specified in A in Table 4 of "Arc Radiation". The adhesion grade is based on GB / T9286-1998 "Cross-cut test of paint and varnish film"; the chloride salt corrosion resistance adopts the immersion method. , the surface is gently rinsed with running water, and the surface of the coating film is observed for discoloration, blistering, cracking, and falling of...

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Abstract

The invention belongs to the technical field of polyester powder coating preparation, and in particular relates to a long-acting weather-resistant, chlorine-salt corrosion-resistant polyester powder coating and a preparation method. The main raw materials of the powder coating of the present invention are: 530-560 parts of polyester resin, 45-60 parts of TGIC, 10-15 parts of trimesic acid triglycidyl ester, 120-180 parts of titanium dioxide, and 80-120 parts of barium sulfate , 8‑12 parts of brightening agent, 7‑10 parts of leveling agent. The polyester resin used in the powder coating of the present invention has a good linear structure, which ensures excellent fluidity; the powder coating uses a larger amount of trifunctional curing agent TGIC, and is matched with triglycidyl trimesic acid with a low melting point and excellent water resistance Esters are used as low-temperature curing agents to further improve the crosslinking density and water resistance of the coating film, and finally ensure long-term weather resistance and chloride salt corrosion resistance. The final powder coating product can be used for low-temperature curing at 160°C. The coating film prepared by it has good long-term weather resistance and chlorine salt corrosion resistance, and is especially suitable for infrastructure spraying on highways such as guardrails and bridges.

Description

technical field [0001] The invention belongs to the technical field of polyester powder coating preparation, and particularly relates to a long-term weather-resistant and chlorine-salt corrosion-resistant polyester powder coating and a preparation method. Background technique [0002] Powder coatings are becoming more and more widely used because they do not contain organic solvents and are 100% solid. It is used in the coating of building shells such as household appliances, automobile industry, outdoor bridges, highway guardrails, etc. [0003] In winter, in order to prevent icing and ensure the smooth flow of expressways, it is necessary to spread a large amount of snow-melting agent. At present, the main varieties of snow-melting agents at home and abroad are chloride salt products, such as sodium chloride, magnesium chloride, calcium chloride, etc. The spreading range is wide, and it has to be spread throughout the winter. The spreading time is long, and the solubility...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D167/02C09D5/03C09D5/08C09D7/61C09D7/63C08G63/682
CPCC08G63/6826C08K2003/2241C08K2003/3045C09D5/033C09D5/08C09D167/02C08K13/02C08K5/34924C08K5/1515C08K3/30C08K3/22
Inventor 陈君徐友楼鲍文鑫吴有军
Owner 安徽鑫友高分子新材料科技有限公司
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