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Preparation method for acrylate-modified epoxy resin cathode electrophoresis emulsion

A technology of epoxy resin and acrylate, applied in the direction of electrophoretic coatings, coatings, etc., can solve the problems of reduced paint film performance and low reactivity of emulsifiers, and achieve mild polymerization reaction process, good anti-corrosion performance, and good paint film properties Effect

Active Publication Date: 2018-11-30
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

[0036] A kind of preparation method of acrylate modified epoxy resin cathodic electrophoretic emulsion, its steps are as follows:

[0037] 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;

[0038] 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

[0042] A kind of preparation method of acrylate modified epoxy resin cathodic electrophoretic emulsion, its steps are as follows:

[0043] 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;

[0044] 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

[0048] A kind of preparation method of acrylate modified epoxy resin cathodic electrophoretic emulsion, its steps are as follows:

[0049] 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;

[0050] 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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Abstract

The invention discloses a preparation method for an acrylate-modified epoxy resin cathode electrophoresis emulsion. The method adopts a monoprotic organic acid containing a double bond and a biproticorganic acid containing a double bond or / and an acid anhydride to react with epoxy resin, double bonds are introduced into a main chain of the epoxy resin, acrylic resin is grafted into the epoxy resin by utilizing copolymerization of the double bonds and an acrylate monomer, more acrylic resin can be introduced onto the main chain of the epoxy resin, adjustment and control of an introduction amount of the acrylate monomer are achieved through control of the content of the double bonds, and a molecular weight of the main epoxy resin is adjusted through a ratio of carboxyl to epoxy groups; themain body of the prepared product is epoxy resin, so that good anticorrosive performance of a paint film is guaranteed; and when the epoxy resin is aminated, two different organic amines are added step by step for a reaction, so that the reaction process is milder. According to the method disclosed by the invention, the acrylate-modified epoxy resin emulsion prepared by the method has good performance of a paint film and good ultraviolet and salt spray resistance, and can be used for workpieces under conditions of exposure under 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 Applications(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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