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Epoxy resin used for cathode electrophoretic coating and independent of circulation and preparation method of epoxy resin

A cathodic electrophoretic coating and epoxy resin technology, which is applied in the preparation of electrophoretic coatings, epoxy resin coatings, organic compounds, etc., can solve the problems of low solid content, achieve the effect of reducing the sedimentation speed and improving the wrapping ability

Active Publication Date: 2015-07-29
HAOLISEN COATING SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the traditional electrophoretic coating is used, due to the low solid content of the bath, it must be stirred and circulated at all times to ensure the stability of the electrophoretic bath, even when electrophoresis is not required.

Method used

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  • Epoxy resin used for cathode electrophoretic coating and independent of circulation and preparation method of epoxy resin
  • Epoxy resin used for cathode electrophoretic coating and independent of circulation and preparation method of epoxy resin
  • Epoxy resin used for cathode electrophoretic coating and independent of circulation and preparation method of epoxy resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of carboxylated bisphenol A polyoxyethylene ether

[0038] The specific formula is as follows:

[0039] Substance name

Servings (g)

Bisphenol A polyoxyethylene ether

560

Succinic anhydride

200

Triethylamine

2

Xylene

30

[0040] Add bisphenol A polyoxyethyl ether, succinic anhydride, triethylamine and xylene into a four-necked flask equipped with a thermometer, a stirring paddle and a condenser tube, raise the temperature to 85°C, keep the temperature for 5 hours, and then cool down and discharge the material, namely Get carboxylated bisphenol A polyoxyethylene ether. Store in a dry airtight container for later use. The reaction formula is as follows:

[0041]

Embodiment 2

[0043] The specific formula is as follows:

[0044] Substance name

Servings (g)

Example 1 Resin

90

128 epoxy resin

200

Triethylamine

1

[0045] In a four-neck flask equipped with a thermometer, a stirring paddle, and a condenser, add 128 epoxy resin (produced by Nanya Company, epoxy equivalent 186) and then add the resin of Example 1. Add triethylamine as a catalyst, raise the temperature to 130°C, keep the temperature for 3 hours, then cool down and discharge the material to obtain an epoxy resin with an epoxy equivalent of about 1100, and put it in a clean and sealed container for later use. The reaction formula is as follows:

[0046]

Embodiment 3

[0048] Preparation of semi-blocked isocyanates.

[0049] The specific formula is as follows:

[0050] Substance name

Servings (g)

Toluene diisocyanate

200

methyl isobutyl ketone

100

Diethylene glycol monobutyl ether

185

[0051] In a four-necked flask equipped with a thermometer, a stirring paddle, and a condenser tube, add toluene diisocyanate and methyl isobutyl ketone, and heat up to 50°C. Add diethylene glycol ethylene glycol monobutyl ether dropwise into it. About two hours after the completion of the dropwise addition, the insulation was continued for two hours to obtain a semi-blocked isocyanate. Put it in a dry and sealed container for later use, the reaction formula is as follows:

[0052]

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PUM

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Abstract

The invention relates to the technical field of cathode electrophoretic coatings, in particular to epoxy resin used for a cathode electrophoretic coating and capable of guaranteeing normal use without dependence of circulation as well as a preparation method of the epoxy resin. According to the epoxy resin, bisphenol A polyoxyethylene ether resin participates in chain extension and is modified by amine, meanwhile, semi-closed isocyanate is introduced on a side chain, and a side group comprises inclusion and a highly toughening main chain. The epoxy resin has a good appearance leveling effect and throwing power; the filler and pigment settling speed is greatly decreased when the coating stops circulating, and the coating after the circulation is stopped can be used normally when the circulation is performed again.

Description

[technical field] [0001] The invention relates to the technical field of cathodic electrophoretic coatings, in particular to a method for preparing an emulsion resin of cathodic electrophoretic coatings which can ensure normal use without relying on circulation. [Background technique] [0002] Since the 1970s, cathodic electrophoretic coatings have been used in industrial applications because of their excellent corrosion resistance, excellent mechanical properties and high automation in coating applications. Make it widely used and popularized in the automobile industry rapidly. Cathodic electrophoretic coating is the best among water-based coatings. First, it uses water as a solvent, which is non-polluting, non-toxic, and has no fire hazard. High corrosion resistance, its research and development has been widely favored by people. With the growth of the domestic automobile industry, the cathodic electrophoretic coating mainly based on epoxy resin is more and more showing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C271/28C07C269/06C09D163/00C09D5/44
Inventor 柳昀刘薇薇赵颖周贤苏献兰胡浩东郭辉
Owner HAOLISEN COATING SHANGHAI
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