Resin emulsion for high penetrating powder cathod electrophoresis paint

A cathodic electrophoretic coating and resin emulsion technology, which is applied in electrophoretic coatings, epoxy resin coatings, coatings, etc., can solve the problems of low throwing power and achieve the effects of improved throwing power, strong emulsification ability, and high conductivity

Active Publication Date: 2004-05-05
CNOOC CHANGZHOU EP COATING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resin emulsion prepared by this method realizes thick film coating and has excellent coating performanc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1 Preparation of linear polyamine-modified monoepoxides

[0013] In a clean reactor equipped with a thermometer, a stirrer, a reflux condenser and a dropping device, add 116kg of hexamethylenediamine (linear polyamine), raise the temperature to 60°C, and mix 334kg of butyl glycidyl ether (monoepoxide, Produced by SHELL company, epoxy equivalent 167) is added dropwise in the reaction kettle, after dripping, the temperature is raised to 60~70°C, after 3 hours of heat preservation, the material is discharged, put into a clean airtight container and preserved for later use, and the solid content is 100%.

Embodiment 2

[0014] Example 2 Preparation of amine-modified bisphenol A epoxy resin

[0015] In a clean reaction kettle equipped with a thermometer, a stirrer, and a reflux condenser, add 182kg of propylene glycol methyl ether solvent, heat up to above 80°C, add 480kg of bisphenol A epoxy resin E-1001 (produced by SHELL company, epoxy equivalent 480 ), heat up to 100-110°C, keep warm to dissolve the epoxy resin until the epoxy resin is completely dissolved, cool down below 80°C, add 53kg of diethanolamine (amine compound containing active hydrogen, mono-secondary amine), heat up to 90°C, Keep warm for 1 hour, then lower the temperature below 80°C, add 25kg of diethylaminopropylamine (amine compound containing active hydrogen, polyamine containing both primary and tertiary amino groups), heat up at 110°C for 3 hours, cool down below 80°C and discharge, The obtained amine-modified bisphenol-A epoxy resin was put into a clean and airtight container for future use. The solid content was 75.4%,...

Embodiment 3

[0016] Example 3 Preparation of fully blocked polyisocyanate crosslinking agent with active hydrogen organic compound as blocking agent

[0017] In the clean reactor equipped with thermometer, stirrer, reflux condenser and dropping device, add 140kg toluene diisocyanate (T-80, produced by BAYER company), 213kg diphenylmethane diisocyanate (DESMODUR VL, produced by BAYER company) , 97kg methyl isobutyl ketone solvent, 1kg dibutyltin dilaurate catalyst, heat up to about 35°C, start to drop 520kg diethylene glycol butyl ether (sealing agent) into the reactor, control the temperature at 60-80 Between ℃, after dripping, raise the temperature to 100-110℃ and keep it warm for 3 hours. When the free NCO content is measured to be lower than 0.5%, cool down to below 80℃ and discharge the material, put it in a clean and sealed container for future use, and its solid content is 90%. .

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Abstract

A resin emulsion with high electrophoretic mobility for cathode electrophoretic paint is prepared from the linear polyamine modified monocycle oxide, amine modified biphenolic epoxy resin, and full-enclosed polyisocyanate as cross-linking agent through proportionally mixing, chemically, reacting, neutralizing, with organic acid and dispersing in water. Its advantages are high electrophoretic coating productivity and high anticorrosion power.

Description

technical field [0001] The invention relates to a resin emulsion for cathodic electrophoretic paint with high throwing power. Background technique [0002] Since the development of cathodic electrophoretic coatings in the mid-1970s and their rapid industrial application, the paint film formed has excellent corrosion resistance, mechanical properties, and is suitable for automatic coating, and has quickly become popular in the automotive industry. . Due to the complex shape of the automobile body and parts, there are many concave bodies, cavities and gaps. In the process of electrophoretic coating, the electric shielding phenomenon often occurs, which makes the thickness of the paint film on the inner and outer surfaces of the coated workpiece uneven, and the paint film on the inner surface is thinner, which seriously affects the anti-corrosion performance of the entire workpiece. Whether the deep recesses, crevices, or shielded parts of the coated workpiece can be evenly c...

Claims

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Application Information

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IPC IPC(8): C09D5/44C09D163/00
Inventor 方基祥陈卫东熊挽志缪蕾
Owner CNOOC CHANGZHOU EP COATING
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