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Anti-corrosion powder coating for automobile

A powder coating and anti-corrosion technology, applied in powder coatings, anti-corrosion coatings, epoxy resin coatings, etc., can solve the problems of increasing the separation tendency of coatings and metals, unfavorable coating anti-corrosion, etc.

Active Publication Date: 2013-03-27
SHANGHAI BANGZHONG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the cathodic protection effect of active pigments increases the cathodic reaction trend between the interfaces. With the continuous increase of the ion concentration between the interfaces, under the action of osmotic pressure, the penetration of water into the interface is increased, thereby increasing the separation of the coating and the metal. trend, this negative effect is not conducive to the corrosion protection of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] After the mixture of Example 1 is preliminarily mixed, it is melted and extruded by a screw extruder, pressed into tablets, crushed, and the steps of melted extrusion, tableted, and broken are repeated 4 times, and the obtained powder material is passed through a 200-mesh sieve, passed The material of the sieve is a qualified product.

[0026] After the prepared powder coating is electrostatically sprayed, the coating adhesion on the metal surface is 0, the impact strength is 100cm, the salt spray resistance time is ≥ 2500 hours, the artificial accelerated aging time is ≥ 200 hours, and the natural exposure is 12 months. The membrane remains intact.

[0027]

Embodiment 2

[0029] After the mixture of Example 2 is preliminarily mixed, it is melted and extruded by a screw extruder, compressed into tablets, crushed, and the steps of melted extrusion, compressed into tablets, and crushed are repeated 4 times. The obtained powder material is passed through a 200-mesh sieve, passed The material of the sieve is a qualified product.

[0030] After the prepared powder coating is electrostatically sprayed, the coating adhesion on the metal surface is 0, the impact strength is 80cm, the salt spray resistance time is ≥3000 hours, the artificial accelerated aging time is ≥300 hours, and the natural exposure is 12 months. The membrane remains intact.

[0031]

Embodiment 3

[0033] After the mixture of Example 3 is preliminarily mixed, it is melted and extruded by a screw extruder, compressed into tablets, broken, and the steps of melted extrusion, compressed into tablets, and broken are repeated 4 times, and the obtained powder material is passed through a 200-mesh sieve, passed The material of the sieve is a qualified product.

[0034] After the prepared powder coating is electrostatically sprayed, the coating adhesion on the metal surface is 0, the impact strength is 85cm, the salt spray resistance time is ≥3000 hours, the artificial accelerated aging time is ≥300 hours, and the natural exposure is 12 months. The membrane remains intact.

[0035]

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Abstract

The invention relates to an anti-corrosion powder coating for an automobile, comprising the following constituents in parts by weight, 100 parts of epoxy resin, 15-35 parts of phenolic epoxy resin, 5-13 parts of polyethylene resin, 10-30 parts of calcium carbonate filler, 3-7 parts o dicyandiamide, 1-8 parts of zinc powder, 1-3 parts of organosilicone levelling agent and 0.1-1 part of oxidation catalyst, wherein platinum catalysts have the function of catalytic combustion and can be used for adsorbing oxygen or organic groups. During the static spraying of the powder coating aforementioned, a lot of oxygen mixed in the coating is consumed under the action of the catalyst. Oxygen forms hydroxyl groups, carbonyl groups or ketone groups after being consumed, so that the formed film has a great steric hindrance effect on the migration of oxygen. An anti-corrosion purpose is achieved by isolating oxygen from migrating to the surface of a metal material. The powder coating disclosed by the invention has a great anti-corrosion effect.

Description

[0001] technical field [0002] The invention relates to an anticorrosion powder coating for automobiles. Background technique [0003] Automotive anti-corrosion powder coatings are the main application direction of powder coatings. The main way of anti-corrosion is to shield oxygen and water vapor. The shielding mechanism of the coating is mainly to prevent corrosive substances from contacting the metal surface. The coating must not only have low water permeability, oxygen permeability, and ion permeability, but also have good moisture resistance and adhesion. The water permeability or water gas permeability of the coating is determined by the dissolution and diffusion of water in the coating. Dissolution refers to water Maximum content in non-dissolved coatings. Diffusion refers to the migration of water molecules in the coating. For coatings with pores, the water permeability and water vapor permeability are not consistent, because water can also be transferred through ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D163/04C09D123/06C09D5/10C09D5/03
Inventor 毕宏海储江顺彭艳华欧阳贵程启山郑飞燕肖伏兰李南平赵凯欧阳圣
Owner SHANGHAI BANGZHONG NEW MATERIAL
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