Low temp. solidifeed resin emulion used for cathode electrolytic coating

A cathodic electrophoretic coating, resin emulsion technology, applied in electrophoretic coatings, epoxy resin coatings, coatings, etc., can solve the problems of waste of resources, increased cost, single color of the paint film, etc., and achieve good leveling and good decoration. Effect

Inactive Publication Date: 2004-03-24
CNOOC CHANGZHOU EP COATING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, many practical problems have been caused, such as high energy consumption resulting in waste of resources and increased costs; it cannot be applied to heat-sensitive materials; the color of the paint film is single, and it cannot take into account the decorative properties of the paint film, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] One, prepare modified epoxy resin A

[0022] 1. See Table 1 for the formula

[0023]

components

raw material

Dosage (g)

name

Specification

epoxy compound

GY 2600

(Bisphenol A diglycidyl ether)

Epoxy equivalent weight 187,

Produced by Ciba

140

Cardura E-10

(glycidyl tertiary carbonate, used as

Glycidyl esters with flexible chains)

Epoxy equivalent weight 250,

Produced by Shell

13.4

Polyol

Bisphenol A

Commercially available, industrial products

51

Polyether 204

(Polypropylene glycol, used as a flexible chain

of polyols)

Hydroxyl equivalent weight 200,

DOW chemical products

15

Wherein: epoxy compound / polyhydroxyl compound weight ratio is equal to 6.97 / 3;

The weight of glycidyl esters containing flexible chains is 9.5% of bisphenol A diglycidyl eth...

Embodiment 2

[0038] 1. Preparation of modified epoxy resin B

[0039] 1. See Table 4 for the formula

[0040]

components

raw material

Dosage (g)

name

Specification

epoxy compound

GY2600

(Bisphenol A diglycidyl ether)

Epoxy equivalent weight 187

Produced by Ciba

150

Neopentyl glycol diglycidyl ether

(glycidyl ether with flexible chain)

Epoxy equivalent weight 142

Commercially available, industrial products

10

Polyol

Bisphenol A

Commercially available, industrial products

50

Wherein: epoxy compound / polyhydroxy compound weight ratio is equal to 6.40 / 2;

The weight of glycidyl ether containing flexible chains is that of bisphenol A diglycidyl ether

6.67%;

Polyols containing flexible chains are not added to the polyols;

[0041] 2. Operation process

[0042] In a four-neck flask equipped with a stirrer, condense...

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PUM

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Abstract

The present invention relates to a low-temp. soldified resin emulsion for cathodic electrophoretic coating. It is made of 20-70% of modified epoxy resin, 5-50% of polyamine and 10-30% of closed polyisocyanate which can completely declosed at 120-140 deg.C, through the processes of chemical reaction, mixing, neutralizing with organic acid and dispersing in water, in which the modified epoxy resin is made up by using epoxy compound and polyhydroxylated compound and adopting epoxy resin synthesis method under the action of catalyst, its molecular weight is 300-3000, and the pure solid weight ratio of epoxy compound and polyhydroxylated compound is 5-8/2-5. The described epoxy compound is bisphenol A diglycidyl ether and glicidyl ether containing flexible chain or glycidyl ester, and the polyhydroxylated compound is bisphenol A and polyhydroxylated compound containing flexible chain.

Description

technical field [0001] The invention relates to a resin emulsion for cathodic electrophoretic paint cured at low temperature. Background technique [0002] In cathodic electrophoretic coatings, resin emulsion is the main film-forming substance, which determines the film performance of cathodic electrophoretic coatings, and has always been the focus of people's research and development. Epoxy cathodic electrophoretic coatings are widely used because of their excellent corrosion resistance. The resin emulsion used for this type of coating is made by aminating epoxy resin to open the ring, then adding blocked polyisocyanate for mixing, neutralizing with organic acid, and dispersing in water. In order to ensure good paint film performance, the curing temperature is generally 160-200°C. This has caused many practical problems, such as high energy consumption resulting in waste of resources and increased costs; it cannot be applied to heat-sensitive materials; the paint film has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/44C09D163/00
Inventor 方基祥缪蕾陈卫东熊挽志
Owner CNOOC CHANGZHOU EP COATING
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