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Resin emulsion for cathode electrophoretic coating with high throwing power and preparation method thereof

A cathodic electrophoretic coating, resin emulsion technology, applied in electrophoretic coatings, epoxy resin coatings, coatings, etc., can solve the problems of poor appearance flatness, reduced throwing power, high dependence, etc., and achieve low solvent content and aggregation. The effect of high viscosity and high throwing power

Active Publication Date: 2012-12-26
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 03158228.1 discloses a resin emulsion for cathodic electrophoretic coatings with high throwing power. The throwing power of the resin emulsion is more than 20cm by the Ford cell method, but due to the large dependence of the resin emulsion on the solvent, when the solvent content is low, paint film Thinner, poor appearance flatness, and the throwing power will be significantly reduced with the addition of solvent content, which can no longer meet the needs of the automotive coating industry with increasing requirements for throwing power

Method used

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  • Resin emulsion for cathode electrophoretic coating with high throwing power and preparation method thereof
  • Resin emulsion for cathode electrophoretic coating with high throwing power and preparation method thereof

Examples

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Embodiment 1

[0025] Embodiment 1 prepares resin emulsion A for cathodic electrophoretic coating with high throwing power

[0026] Concrete preparation steps are as follows:

[0027] ① Preparation of modified epoxy resin A with number average molecular weight of 1500-3000

[0028] In a four-necked flask equipped with a stirrer, a condenser tube, a nitrogen pipe, and a thermometer, add 180 g of bisphenol A epoxy resin EP194 (Shell company product brand) with an epoxy equivalent of 983 and 24 g of solvent methyl isobutyl Ketone, nitrogen, heated together to 110 ° C until the epoxy resin is completely melted, cooled to 90 ° C, added 26.7g of flexible polymer self-made polyether diamine, heated to 120 ° C for chain extension reaction, and kept for 2 hours. After the heat preservation reaction is over, cool down to 100°C, add 27g of plasticizer bisphenol A polyoxyethylene ether BPLE / B (product brand of SEPPIC company) and 16g of solvent methyl isobutyl ketone, and mix well to obtain a number av...

Embodiment 2

[0041] Embodiment 2 prepares resin emulsion B for cathodic electrophoretic coating with high throwing power

[0042] Concrete preparation steps are as follows:

[0043] ① Preparation of modified epoxy resin B with number average molecular weight of 1500-3000

[0044] In a four-necked flask equipped with a stirrer, condenser, nitrogen pipe, and thermometer, add 140g of bisphenol A epoxy resin 1001 (the product brand of Shell Company) with an epoxy equivalent of 480 and 10g of solvent methyl isobutyl Ketone, blow nitrogen, heat together to 110°C until the epoxy resin is completely melted, then cool down to 90°C, add 39g of flexible polymer polycaprolactone diol PCL205 (product brand of DAICEL company), heat to 140°C and add 0.2g Catalyst N-methylbenzylamine, the mixture is naturally exothermic to 165°C, and kept warm for 0.5 hours, then added 0.6g of catalyst N-methylbenzylamine, continued to keep warm at 165°C for 1.5 hours, after the heat preservation reaction, cooled to 100°...

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Abstract

The invention relates to resin emulsion for cathode electrophoretic coating with high throwing power and a preparation method of the resin emulsion, wherein the emulsion is obtained by the following steps: heating and mixing modified epoxy resin aminated by various single molecular amines and one or two of fully-closed aromatic polyisocyanates; using organic acid to neutralize the mixture; and using de-ionized water to disperse the mixture, wherein the weight ratio of raw materials in the resin emulsion solid is as follows: 45-70wt% of modified epoxy resin, 4-10wt% of total single molecular amines, 20-40wt% of fully-closed aromatic polyisocyanates and 1.6-3.5wt% of organic acid; the modified epoxy resin is obtained by replacing part of solvent with plasticizer, and using flexible polymer to extend chain of bisphenol A epoxy resin to be of molecular weight of 1500-3000; in the modified epoxy resin solid, the content of flexible polymer is 10-35% and the content of the plasticizer is 4-14%. The resin emulsion is stable and low in solvent content; the film has smooth appearance and throwing power of more than 22cm.

Description

technical field [0001] The invention relates to a resin emulsion for cathodic electrophoretic paint with high throwing power and a preparation method thereof. Background technique [0002] Electrophoretic coatings have the characteristics of uniform coating on various parts of workpieces with complex geometric shapes, and are widely used in the automotive industry. Throwing power is an important technical index of cathodic electrophoretic coatings for automobiles. In automobile painting, throwing power indicates the ability of cathodic electrophoretic paint to coat the inner cavity of the automobile. In the technical research of cathodic electrophoretic coatings, there are two main purposes of improving the throwing power, one is to improve the overall protective performance of the car, especially the protective performance of the inner cavity, and the other is economic factors. Improvement can reduce the use cost of paint, and can reduce the film thickness of the outer su...

Claims

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Application Information

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IPC IPC(8): C08L63/02C08L71/02C08L75/08C09D163/02C09D5/44
Inventor 凌晓飞陈卫东狄文伟周伟博
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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