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A kind of protective coating for metal processing and its preparation method and application

A technology for protecting paint and metal processing, applied in the direction of coating, etc., can solve the problems of limited use and waste of paint, and achieve the effect of convenient paint removal and cleaning, simple formula, and easy paint removal

Active Publication Date: 2020-04-24
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the use of two-component polyurethane system coatings is more restrictive and easy to cause waste

Method used

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  • A kind of protective coating for metal processing and its preparation method and application

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preparation example Construction

[0023] The invention also provides a preparation method of metal processing protective paint, comprising: adding vinyl chloride resin, leveling agent and matting powder into an organic solvent and stirring evenly.

[0024] Preferably, the vinyl acetate resin is first dissolved in an organic solvent, and then a leveling agent and a matting powder are added.

[0025] Further preferably, the vinyl acetate resin is a carboxyl-modified vinyl vinyl resin; the average molecular weight of the vinyl vinyl resin is 20,000-100,000.

[0026] The present invention also provides a method for using the protective coating for metal processing, which includes: spraying or dip-coating the above-mentioned metal processing protective coating on the metal product during machining, such as CNC, and then machining it after drying. ; Clean with paint remover after standby processing.

[0027] Preferably, the drying process is baking at 60°C-80°C for 20-30min.

[0028] Preferably, in order to facili...

Embodiment 1

[0034] 1. Preparation of protective coating: carboxyl-modified vinyl resin (Carboxyl-modified vinyl resin L-880 from Dongguan Jingze Resin Co., Ltd., average molecular weight 27,000) 20 wt %, pigment (blue flake 0628 from Sun Chemical) 4 wt %, leveling agent (BYK-331 from BYK) 0.1 wt %, matting powder (OK520 from Degussa company) 2 wt %, organic solvent butanone 40 wt %, organic solvent propylene glycol methyl ether acetate 10 wt %, Organic solvent butyl acetate 23.9 wt%. First weigh the solvent methyl ethyl ketone and propylene glycol methyl ether acetate in the mixing tank, add carboxy-modified vinyl acetate resin and pigment color chips while stirring, after the solid powder is completely dissolved, add leveling agent, Matting powder and solvent butyl acetate, dispersed evenly at high speed after feeding.

[0035] 2. Mix and disperse the paint in this example for 9-10 seconds according to the construction viscosity requirements (Iwata 2# viscosity cup, 20°C), add the solvent...

Embodiment 2

[0037] 1. Preparation of protective coating: carboxyl-modified vinyl resin (carboxyl-modified vinyl resin H15 / 45M of Wacker, Germany, with an average molecular weight of 70,000), 20 wt %, pigment color chip (blue chip 0628 of Sun Chemical Company) ) 4 wt %, leveling agent (BYK-331 from BYK) 0.1 wt %, matting agent (OK520 from Degussa company) 2 wt %, organic solvent butanone 40 wt %, organic solvent propylene glycol methyl ether acetate 10 wt % , organic solvent butyl acetate 23.9 wt%. First weigh the solvent methyl ethyl ketone and propylene glycol methyl ether acetate in the mixing tank, add carboxy-modified vinyl acetate resin and pigment color chips while stirring, after the solid powder is completely dissolved, add leveling agent, Matting powder and solvent butyl acetate, dispersed evenly at high speed after feeding.

[0038] 2. Mix and disperse the paint in this example for 9-10 seconds according to the construction viscosity requirements (Iwata 2# viscosity cup, 20°C),...

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PUM

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Abstract

The invention relates to metal machining protection paint. The paint contains vinyl chloride-vinyl acetate copolymer, a levelling agent, matting powder and a solvent. According to the total weight ofthe paint, the content of the vinyl chloride-vinyl acetate copolymer is 15-25 wt%, the content of the levelling agent 0.05-1 wt%, the content of the matting powder is 0.5-3 wt%, and the content of theorganic solvent is 66-79 wt%. A preparation method and an application of the protection paint are also provided. The paint is single-component paint, and can be free of construction time; and at thesame time, the protective paint film formed by the paint is easy to dissolve in a paint remover, and thus, easy paint removing and cleaning can be achieved, and paint slag cannot be generated.

Description

technical field [0001] The invention relates to the field of machining of metal materials, in particular to a method for protecting the surface of a material during machining, in particular to a metal processing protective coating composition and a preparation method for the protective coating. Background technique [0002] In the production process of metal parts, it is usually necessary to use machining methods such as cutting, cutting, and CNC to process the product's external dimensions. In the process of processing, metal shavings are often splashed to scratch the surface, or the appearance is damaged by rubbing, so a layer of protective film paint is often applied before machining to reduce damage during processing, and the protective film paint is applied after processing Clean with paint remover. [0003] At present, the coatings used for metal product protection in machining are mainly two-component polyurethane coatings, including resin components and curing compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D127/06C09D7/47C09D7/61
CPCC08L2205/03C09D127/06C08L83/12C08L83/04C08L33/04C08L33/16C08L83/10C08L91/06C08K13/02C08K3/36C08K3/34
Inventor 吴照勇
Owner BYD CO LTD
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