Modified epoxide resin and preparing method thereof and high-throwing-power cathode electrophoretic coating

A technology of epoxy resin and epoxy resin emulsion, which is applied in the direction of electrophoretic coatings, anti-corrosion coatings, polyurea/polyurethane coatings, etc., can solve the problems of not being able to satisfy the uniform coating ability, achieve good application prospects, and improve durability Performance such as corrosion, effects of excellent physical and chemical properties

Active Publication Date: 2019-04-16
GUANGDONG KODEST EP SC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cathodic electrophoretic coating containing the polyurethane modified epoxy resin has excellent weather resistance, and has improved the fullness of the paint fil

Method used

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  • Modified epoxide resin and preparing method thereof and high-throwing-power cathode electrophoretic coating
  • Modified epoxide resin and preparing method thereof and high-throwing-power cathode electrophoretic coating
  • Modified epoxide resin and preparing method thereof and high-throwing-power cathode electrophoretic coating

Examples

Experimental program
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Effect test

Embodiment 1～3

[0040] Embodiment 1~3, modified epoxy resin of the present invention and preparation thereof

[0041] The formulations of the modified epoxy resins of Examples 1 to 3 of the present invention are shown in Table 1 below.

[0042] The formula of table 1 embodiment 1~3 modified epoxy resin

[0043]

[0044]

[0045] The epoxy resin is a bisphenol A type epoxy resin with an epoxy equivalent of 184-190 g / eq and a viscosity of 12000-15000 cps / 25°C. The specific model is epoxy resin 128E, which is a commercially available product.

[0046] The preparation method of embodiment 1~3 modified epoxy resin is as follows:

[0047] A1. Preparation of intermediate ketimine A: Add triethylenetetramine and methyl isobutyl ketone in the formula amount to the reactor, react at 160-180°C for reflux for 12 hours, keep at 160-180°C, and 80 ± 10) kPa negative pressure under reflux dehydration 24h, made the intermediate ketimine A;

[0048] A2. Preparation of the intermediate ketimine B: add ...

Embodiment 4～6

[0055] Embodiments 4-6, cathodic electrophoretic coating with high throwing power of the present invention and its preparation

[0056] The formulations of cathodic electrophoretic coatings with high throwing power in Examples 4 to 6 of the present invention are shown in Table 2 below.

[0057] The formula of table 2 embodiment 4~6 cathodic electrophoretic coating with high throwing power

[0058]

[0059] The preparation method of embodiment 4~6 cathodic electrophoretic paint with high throwing power is as follows:

[0060] S1. Preparation of modified epoxy resin emulsion: add the modified epoxy resin in the amount of formula into the reactor, and add the aminosulfonic acid and deionized water in the amount of formula in the stirring state at a temperature of 50-60°C, and keep warm After 4 hours, add deionized water for emulsification, lower the temperature to 45°C to 50°C, and extract the solvent for 5 hours under a negative pressure of -(80±10)kPa to prepare a modified ...

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Abstract

The invention belongs to the technical field of environment-friendly waterborne coatings, and particularly relates to modified epoxide resin and a preparing method thereof and a high-throwing-power cathode electrophoretic coating with the modified epoxide resin. The modified epoxide resin is prepared from epoxy resin, bisphenol, polyethylene glycol, N,N-dimethyl benzylamine, 4-methyl-2-pentanone,midbody ketimine A, midbody ketimine B, midbody ketimine C, an alcohol ether solvent, propylene glycol methyl ether acetate and polyether amine; corresponding emulsion and color paste are prepared through the modified epoxide resin, and then the emulsion and the color paste are mixed in proportion to prepare the cathode electrophoretic coating. Compared with an existing cathode electrophoretic coating, the throwing power of the cathode electrophoretic coating is remarkably improved, electrophoretic painting of the surface of a workpiece with the complex surface structure can be well met, the surface, the sunken portion, the gap portion and the shielded portion of the painted workpiece are coated with coating layers with the even thickness, the whole corrosion resistance and the like of theworkpiece are effectively improved accordingly, and the application range is wide.

Description

technical field [0001] The invention belongs to the technical field of environment-friendly water-based coatings, and in particular relates to a modified epoxy resin, a preparation method thereof, and a cathodic electrophoretic coating with high throwing power containing the modified epoxy resin. Background technique [0002] Cathodic electrophoretic coating has technical advantages such as excellent anti-corrosion performance, high automatic coating efficiency, and water-based environmental protection. It has been widely used in electrical appliances, building materials, automobiles and other industries. Throwing power refers to the ability of the paint to coat the inner surface, recesses and back of the object to be coated during electrophoretic painting, and also refers to the ability to coat a uniform paint film on all surfaces of the complex object to be coated. Threshing power performance is a key performance of electrophoretic coating performance. With excellent throw...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/44C09D5/08C09D7/61C09D7/63
CPCC08G18/58C08G18/584C08G18/724C08G18/758C08G18/7671C08G59/1477C08G59/62C09D5/08C09D5/4465C09D5/4492
Inventor 李文庄杨波高睿邓仲明
Owner GUANGDONG KODEST EP SC CO LTD
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