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Preparation method of high-throwing-power emulsion

A technology of throwing power and emulsion, which is applied in the field of preparation of high throwing power emulsion, which can solve complex and difficult problems, reduce the thickness of the paint film on the outer panel, etc., and achieve the effects of reducing types, low solvent content, and reducing VOC emissions

Active Publication Date: 2020-02-18
湖南伟邦汽车涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main method is to add polypolyol and use cross-linked emulsion to reduce the paint film thickness of the outer panel. However, how to make a stable high-throwing power coating, especially a high-throwing power emulsion is a complicated and difficult process.

Method used

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  • Preparation method of high-throwing-power emulsion
  • Preparation method of high-throwing-power emulsion

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Experimental program
Comparison scheme
Effect test

Embodiment

[0031] 1. Preparation of crosslinking agent:

[0032] S1. Put 7.6% methyl ethyl ketone and 10.8% trimethylol propane into the dropping tank, turn on the stirring, and raise the temperature of the dropping tank to 65°C (not to exceed 75°C), so that the trimethylol propane is dissolved in the methyl ethyl ketone , prepared into a mixed solution and kept warm at 50-75°C for use;

[0033] S2. Add 43.5% toluene diisocyanate, 5% methyl ethyl ketone, and 0.02% dibutyltin dilaurate into the reaction kettle, stir under nitrogen atmosphere, and raise the temperature to 45°C; then slowly add the mixed solution obtained in S1 dropwise at a uniform speed, The temperature of the reaction kettle is controlled at 55-60 ° C, fully stirred, and the temperature is kept for 1 hour after the mixture is added dropwise;

[0034] S3. Continue to add 33.08% ethylene glycol butyl ether dropwise, and control the temperature of the reactor at 65-70°C. After the dropwise addition, keep the temperature at...

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Abstract

The invention discloses a preparation method of a high-throwing-power emulsion. The preparation method comprises the steps of cross-linking agent preparation, chain extension, amination, neutralization and emulsification, wherein during chain extension, dimethyl benzylamine is added twice, bisphenol-A polyoxyethylene ether, methyl monoethanolamine, diethylenetriamine ketimine, trimethylolpropane and other materials are adopted, and temperature and time parameters in the preparation process are designed and controlled. Through the preparation method, the emulsion with high throwing power can beprepared, the throwing power can reach 22cm, and the storage stability of the emulsion is improved obviously.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to a preparation method of a high throwing power emulsion. Background technique [0002] The development of electrophoretic coatings originated in the 1930s, and the early development mainly focused on anodic electrophoretic coatings. However, in practical applications, due to the disadvantage of dissolving the anode during the electrodeposition process of the anodic electrophoretic coating, the dissolution of metal ions will cause the pollution of the tank solution, making it unstable, increasing the maintenance cost of the tank solution, and causing the corrosion resistance of the paint film to decrease. Promoted the development of cathodic electrophoretic coatings. Since the metal workpiece of the cathodic electrophoretic coating is the cathode, the phosphating layer will not be damaged; during the electrodeposition process, there will be no metal ions to dissolve and pollute...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/44
CPCC09D5/4438
Inventor 王永唐瑞华段誉黎文玉
Owner 湖南伟邦汽车涂料有限公司
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