A kind of preparation method of acrylate modified epoxy resin cathodic electrophoretic emulsion

An epoxy resin and acrylate technology, applied in electrophoretic coatings, coatings, etc., can solve the problems of low reactivity of emulsifiers and reduced paint film performance, and achieve mild polymerization process, good paint film properties, and production process control. Wide range of effects

Active Publication Date: 2020-11-03
吴让君
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with methods (1) and (2), this method has the advantages of convenient temperature control and no use of organic solvents, but it also has the disadvantages of low reactivity of the emulsifier used, which may easily lead to a decrease in the performance of the paint film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of preparation method of acrylate modified epoxy resin cathodic electrophoretic emulsion, its steps are as follows:

[0038] S1. Introducing double bonds into epoxy resin: mix 784 parts of raw epoxy resin E-51, 65 parts of methacrylic acid and 147 parts of maleic anhydride, add 0.5 parts of dimethylbenzylamine, 0.1 part of p-phthalic acid Diphenol and 60 parts of xylene are reacted at 110°C until the acid value of the resin is ≤2mgKOH / g to obtain an epoxy resin mixture containing double bonds;

[0039] S2. Grafting reaction of acrylate resin: add 400 parts of xylene to the double bond-containing epoxy resin mixture obtained in step S1, drop 350 parts of 2-hydroxyethyl methacrylate and 250 parts of acrylic acid -A mixture of 2-hydroxyethyl ester, 350 parts of 2-hydroxypropyl methacrylate, 350 parts of cyclohexyl methacrylate, 40 parts of n-butyl acrylate and 50 parts of azobisisobutyronitrile, react at 90°C for 5h , keep warm for 1h, obtain the acrylate-modified ...

Embodiment 2

[0043] A kind of preparation method of acrylate modified epoxy resin cathodic electrophoretic emulsion, its steps are as follows:

[0044] S1, introducing double bond in epoxy resin: 400 parts of raw material epoxy resin E-44 and 400 parts of raw material epoxy resin 128E and 150 parts of cis-octadec-9-enoic acid and 260 parts of glutaconedic acid are mixed, Add 1 part of triethylamine, 0.2 parts of hydroquinone, and 100 parts of isopropanol, react at 100°C until the acid value of the resin is ≤3 mgKOH / g, and then obtain a double bond-containing epoxy resin mixture;

[0045] S2, acrylate resin grafting reaction: Add 400 parts of isopropanol to the epoxy resin mixture containing double bonds obtained in step S1, drop 400 parts of methyl methacrylate, 260 parts of methyl acrylate, A mixture of 340 parts of ethyl methacrylate, 300 parts of ethyl acrylate, 40 parts of 2-ethylhexyl acrylate and 20 parts of benzoyl peroxide was reacted at 110°C for 6 hours and kept for 1 hour to obt...

Embodiment 3

[0049] A kind of preparation method of acrylate modified epoxy resin cathodic electrophoretic emulsion, its steps are as follows:

[0050] S1. Introducing double bonds into epoxy resin: 800 parts of raw material epoxy resin Shell 188E, 200 parts of raw material epoxy resin GELR144M, 200 parts of octadeca-9,12-dienoic acid and 130 parts of methylene butadiene Acid and 116 parts of maleic acid are mixed, add 1 part of anhydrous sodium acetate, 0.1 part of hydroquinone, 100 parts of ethylene glycol butyl ether, and react at 100 ° C until the resin acid value is ≤ 2 mgKOH / g, that is, the resin containing Double bond epoxy resin mixture;

[0051] S2, acrylate resin grafting reaction: Add 400 parts of ethylene glycol butyl ether to the epoxy resin mixture containing double bonds obtained in step S1, drop 293 parts of n-butyl methacrylate, 100 parts of acrylic acid A mixture of n-butyl ester, 320 parts of isobutyl methacrylate, 360 parts of cyclohexyl methacrylate, 258 parts of 2-hy...

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PUM

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Abstract

The invention discloses a method for preparing an acrylate-modified epoxy resin cathodic electrophoretic emulsion. The monobasic organic acid containing a double bond and the dibasic organic acid or / and acid anhydride containing a double bond are used to react with an epoxy resin. The double bond is introduced into the main chain of the resin, and the acrylic resin is grafted into the epoxy resin by copolymerization of the double bond and the acrylate monomer, so that more acrylic resin can be introduced into the main chain of the epoxy resin and achieved by controlling the double bond content. Adjustment of the amount of acrylate monomer introduced, adjust the molecular weight of the main epoxy resin through the ratio of carboxyl group to epoxy group; the main body of the obtained product is epoxy resin, which is beneficial to ensure that the paint film has good anti-corrosion performance; Adding two different organic amines step by step during the amination of epoxy resin can make the reaction process more gentle. The acrylate-modified epoxy resin emulsion prepared by the invention has good paint film performance, good ultraviolet resistance and salt spray resistance, and can be used for workpieces exposed to the sun.

Description

technical field [0001] The invention relates to the technical field of electrophoretic coatings, in particular to a method for preparing an acrylate-modified epoxy resin cathodic electrophoretic emulsion. Background technique [0002] Electrophoretic paint is divided into cathodic electrophoresis and anodic electrophoresis. Electrophoretic paint is a new type of low-pollution, energy-saving, resource-saving, and corrosion-resistant paint. The mechanization and automation of the assembly industry is suitable for the coating of complex shapes, edges, corners, and holes. It is currently widely used in the coating of hardware such as automobiles, automatic vehicles, electromechanical appliances, and home appliances. The matrix resin of the electrophoretic coating is an important factor affecting the quality of the final coating film during the electrophoretic coating process. [0003] During the use of mechanical products, due to the influence of climate and environmental condi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D151/08C09D5/44C08F8/32C08F283/10C08F220/32C08F220/18C08F220/20C08G59/17C08G59/16
CPCC09D151/08C08F8/32C08F283/105C08G59/1438C08G59/1461C08G59/1466C09D5/4415C09D5/4492C08L2205/03C08L75/04C08F220/1806C08F220/325
Inventor 吴让君李晴红
Owner 吴让君
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