Epoxy acrylic cathode electrophoretic coating resin emulsion and preparation method thereof

A cathodic electrophoretic coating, epoxy acrylic technology, applied in electrophoretic coatings, epoxy resin coatings, anti-corrosion coatings, etc., can solve problems such as poor compatibility between epoxy resin and acrylic resin, reduce coating costs, and simplify coating. Process, the effect of broad application prospects

Active Publication Date: 2019-02-01
CHINA NAT OFFSHORE OIL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the epoxy acrylic resin system for cathodic electrophoretic coatings is mainly realized by the graft modification of epoxy resin and acrylic acid monomer, and the blending modification of epoxy resin and acrylic resin. Due to the compatibility of epoxy resin and acrylic resin However, how to achieve the stability of epoxy acrylic cathodic electrophoresis resin emulsion while ensuring the aging resistance and salt spray resistance of the paint film is still a technical problem to be solved

Method used

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  • Epoxy acrylic cathode electrophoretic coating resin emulsion and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0021] A kind of preparation method of epoxy acrylic cathodic electrophoretic coating resin emulsion, concrete preparation steps are as follows:

[0022] (1) Preparation of acrylic resin containing reactive functional groups: Add 25g of tetrahydrofuran into a reaction flask equipped with an electric stirrer, reflux condensing device, and thermometer, start stirring and heat up to 80°C; add 80g of 2-fluoroacrylic acid dropwise , 25g N-methacrylamide, 243g heptafluorobutyl acrylate, 219g isopropyl methacrylate, 150g isobornyl methacrylate, 238g hexyl acrylate, 20g benzoyl peroxide mixture, within 3.5 hours After completion of the dropwise addition, heat preservation reaction for 2.5 hours, add an appropriate amount of initiator benzoyl peroxide, continue heat preservation reaction for 2 hours after the completion of the dropwise addition to prepare an acrylic resin containing reactive functional groups, and the average molecular weight of the resin is 6800;

[0023] (2) Preparat...

Embodiment 2

[0025]A kind of preparation method of epoxy acrylic cathodic electrophoretic coating resin emulsion, concrete preparation steps are as follows:

[0026] (1) Preparation of acrylic resin containing reactive functional groups: Add 40g of n-propanol in a reaction flask equipped with an electric stirrer, reflux condensing device, and thermometer, start stirring and heat up to 75°C, add dropwise 98g of 2- Methyl acetamidoacrylate, 102g methyl 2-hydroxymethacrylate, 197g ethyl methacrylate, 266g isobutyl acrylate, 237g cyclohexyl methacrylate, 48g isooctyl acrylate, 12g azobisisobutyrocyanide The mixed solution was added dropwise within 3 hours, and the heat preservation reaction was carried out for 3 hours, and an appropriate amount of initiator azobisisobutylcyanide was added. After the dropwise addition, the heat preservation reaction was continued for 1.5 hours to prepare an acrylic resin containing reactive functional groups, and the average molecular weight of the resin was is...

Embodiment 3

[0029] A kind of preparation method of epoxy acrylic cathodic electrophoretic coating resin emulsion, concrete preparation steps are as follows:

[0030] (1) Preparation of acrylic resin containing reactive functional groups: Add 30 g of isopropanol to a reaction bottle equipped with an electric stirrer, reflux condensing device, and thermometer, start stirring and heat up to 90° C., dropwise add 60 g of acrylic acid, A mixture of 100g hydroxyethyl acrylate, 200g methyl methacrylate, 398g butyl acrylate, 202g styrene, and 10g benzoyl peroxide was added dropwise within 4 hours. Benzoyl oxidation, after the dropwise addition, continue to keep warm for 1 hour to prepare an acrylic resin containing reactive functional groups, and the mass average molecular weight of the obtained resin is 4233;

[0031] (2) Preparation of epoxy acrylic cathodic electrophoretic coating resin emulsion: Add low molecular weight epoxy resin with epoxy equivalent of 235, bisphenol A, and propylene glyco...

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Abstract

The invention relates to the technical field of electrophoretic coating, and particularly relates to epoxy acrylic cathode electrophoretic coating resin emulsion and a preparation method thereof. Thepreparation method mainly comprises the following steps: firstly, synthesizing acrylic resin containing a reactive functional group; then, performing chain extension on epoxy resin until the epoxide equivalent is 400-900 with chain extender, and sequentially reacting the epoxy group in the chain-extended epoxy resin sequentially with organic secondary amine and the acrylic resin containing a reactive functional group to prepare epoxy acrylic resin; and mixing the epoxy acrylic resin with full-closed polyisocyanate, neutralizing the mixture with organic acid, and dispersing the mixture with deionized water to prepare the epoxy acrylic cathode electrophoretic coating resin emulsion. The resin emulsion is stable, has low solvent content and can be used as a film forming component of cathode electrophoretic coating; and the film has corrosion resistance, aging resistance and decorating performance, functions of priming coat and finishing coat can achieved by once electrophoretic coating, the coating process can be simplified, and the coating cost can be reduced.

Description

technical field [0001] The invention relates to an electrophoretic coating, in particular to a method for preparing an epoxy acrylic cathodic electrophoretic coating resin emulsion. Background technique [0002] Since the appearance of cathodic electrophoretic coating in the 1970s, it has been widely used in transportation vehicles, light industry, agricultural machinery, household appliances, military industry, building materials and other industries. It usually uses epoxy resin with good corrosion resistance as the main body. Because this type of resin has high adhesion and excellent anti-corrosion performance, it is often used as primer and anti-corrosion paint, but it has poor weather resistance and does not have gloss and color retention. , not suitable for use as an outdoor decorative finish. Acrylic resins are generally used as topcoats because of their excellent weather resistance, good color and gloss retention, but pure acrylic resins have general chemical resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/44C09D5/08C09D163/10
CPCC09D5/08C09D5/4442C09D5/4488
Inventor 孙家娣陈卫东陈兴兰石汪平
Owner CHINA NAT OFFSHORE OIL CORP
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