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Epoxy resins for cycle-independent cathodic electrophoretic coatings and methods for their preparation

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

Active Publication Date: 2017-09-22
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 resins for cycle-independent cathodic electrophoretic coatings and methods for their preparation
  • Epoxy resins for cycle-independent cathodic electrophoretic coatings and methods for their preparation
  • Epoxy resins for cycle-independent cathodic electrophoretic coatings and methods for their preparation

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 cathodic electrophoretic coatings, in particular to an epoxy resin for cathodic electrophoretic coatings that can ensure normal use without relying on circulation and a preparation method thereof. In the epoxy resin, bisphenol A polyoxyethylene ether resin participates in chain extension and is modified with amine, and at the same time, a semi-blocked isocyanate is introduced on the side chain, and the side group has a wrapped and highly toughened main chain. The invention has good leveling appearance effect and throwing power; when the paint stops circulation, the settling speed of the pigment and filler is greatly reduced, and it can be used normally after recirculation after the stop circulation.

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 Patents(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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