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Zinc-rich powder coating as well as preparation method and application thereof

A powder coating, zinc-rich technology, used in conductive coatings, anti-corrosion coatings, epoxy resin coatings, etc., can solve problems such as VOC emission and environmental pollution, and achieve high powder application rate, good flexibility, and reduce electrostatic shielding effect. Effect

Pending Publication Date: 2022-03-22
北京碧海云智新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional zinc-rich coatings are usually solvent-based coatings, which have the problem of VOC emissions during use, polluting the environment, and there is still room for improvement in the salt spray resistance of coatings

Method used

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  • Zinc-rich powder coating as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The invention provides a preparation method of the zinc-rich powder coating, comprising the following steps:

[0035] The preparation raw materials of the zinc-rich powder coating are mixed, followed by extrusion molding, grinding and screening in order to obtain the zinc-rich powder coating.

[0036] The invention mixes the preparation raw materials of the zinc-rich powder coating to obtain the mixed raw materials. In the present invention, the mixing is preferably carried out under stirring conditions. In the present invention, there is no special limitation on the rotation speed and time of the stirring, as long as the raw materials can be fully mixed. In an embodiment of the present invention, the mixing is specifically carried out in a mixing tank.

[0037] After the mixing, the present invention extrudes the obtained mixed raw materials to obtain molding materials. In the present invention, the extrusion molding temperature is preferably 70-90°C, more preferably...

Embodiment 1

[0054] In terms of parts by mass, the raw materials for the preparation of zinc-rich powder coatings in the present embodiment are as follows:

[0055] 37.7 parts of bisphenol A epoxy resin, 0.85 parts of curing agent, 0.5 parts of catalyst, 60 parts of zinc powder, 0.05 parts of conductive powder, 0.4 parts of butyl acrylate leveling agent, 0.4 parts of degassing agent, and 0.1 part of charging agent; Wherein, the bisphenol A epoxy resin is specifically GESR904H epoxy resin, the epoxy equivalent is 850-900g / eq, and the softening point is 100-112°C; the curing agent is specifically Epikure P101 curing agent; the catalyst It is dimethylimidazole; the particle size of the zinc powder is 500 mesh; the conductive powder is specifically BC-XG230 conductive powder; the butyl acrylate leveling agent is specifically BYK-368P leveling agent; Specifically, it is AS90 charge enhancer.

[0056] The preparation method of zinc-rich powder coating in the present embodiment is as follows:

...

Embodiment 2

[0065] In terms of parts by mass, the raw materials for the preparation of zinc-rich powder coatings in the present embodiment are as follows:

[0066] 32 parts of bisphenol A epoxy resin, 0.5 parts of curing agent, 0.3 parts of catalyst, 65 parts of zinc powder, 0.1 part of conductive powder, 1.2 parts of butyl acrylate leveling agent, 0.4 parts of degassing agent, and 0.5 parts of charging agent; Wherein, the butyl acrylate leveling agent is specifically 988 leveling agent, and the types of other preparation raw materials are the same as in Example 1.

[0067] The zinc-rich powder coating was prepared according to the method of Example 1.

[0068] Construction was carried out according to the method of Example 1 to obtain a steel specimen with a zinc-rich coating attached to the surface, and the thickness of the zinc-rich coating was 90-120 μm.

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Abstract

The invention provides a zinc-rich powder coating as well as a preparation method and application thereof, and belongs to the technical field of coatings. The zinc-rich powder coating provided by the invention is prepared from the following preparation raw materials in parts by weight: 20 to 50 parts of epoxy resin, 0.5 to 2.0 parts of a curing agent, 0.05 to 0.5 part of a catalyst, 60 to 75 parts of zinc powder, 0.05 to 0.1 part of conductive powder, 0.4 to 1.2 parts of a flatting agent, 0.1 to 0.5 part of a degassing agent and 0.1 to 0.5 part of an electricity increasing agent. The zinc-rich powder coating does not discharge VOC in the use process, and is environment-friendly; the conductive powder is added, so that electrons can be transmitted in the cathode protection stage, the corrosion current density is reduced, and a zinc-rich coating formed after the zinc-rich powder coating is cured has excellent salt spray resistance; meanwhile, the zinc-rich coating is good in flexibility, impact resistance and adhesive force and good in appearance.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a zinc-rich powder coating and its preparation method and application. Background technique [0002] For steel substrates, in accordance with the international standard ISO 12944-2007, zinc-rich coatings are generally used as primers in the supporting coatings used in C4, C5, and C5-I harsh atmospheric corrosion environments. Durability and corrosion resistance are outstanding. Traditional zinc-rich coatings are usually solvent-based coatings, which have the problem of VOC emissions during use, polluting the environment, and there is still room for improvement in the salt spray resistance of coatings. The development of low-pollution or even pollution-free high-efficiency composite multi-functional coatings will be the overall development trend of zinc-rich coatings. Contents of the invention [0003] The purpose of the present invention is to provide a zinc-rich powder coat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/10C09D5/24C09D7/63C08G59/50B05D7/14B05D7/24
CPCC09D163/00C09D5/106C09D5/24C09D7/63C08G59/5073B05D7/14B05D7/24C08K2003/0893C08K2003/2231C08K2201/011B05D2504/00B05D2601/28C08K3/08C08K3/041C08K3/2279C08K5/09C08K5/19
Inventor 盛庆南郭泽民邸泰深谢静张家栋
Owner 北京碧海云智新材料技术有限公司
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