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Cathode electrophoretic paint with environment-friendly pretreatment and high matching property and preparation method thereof

A cathodic electrophoretic coating and electrophoretic coating technology, applied in electrophoretic coatings, coatings, etc., can solve problems such as poor salt spray resistance, low throwing power, and paint film defects, so as to improve wet adhesion and wet film resistance Effect

Inactive Publication Date: 2021-01-26
HAOLISEN CHEM TECH (JIANGSU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through experimental verification and many literature reports, most manufacturers of electrophoretic coatings on the market currently have problems such as low throwing power, poor salt spray resistance, and paint film defects in environmental protection pre-treatment. It is necessary to improve the wet film of electrophoretic coatings. resistance, wet adhesion, to solve this problem

Method used

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  • Cathode electrophoretic paint with environment-friendly pretreatment and high matching property and preparation method thereof
  • Cathode electrophoretic paint with environment-friendly pretreatment and high matching property and preparation method thereof
  • Cathode electrophoretic paint with environment-friendly pretreatment and high matching property and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of embodiment 1 phenolic resin modified epoxy resin

[0027]

[0028] * Prepared by the reaction of diethylenetriamine and methyl isobutyl ketone in a molar ratio of 1:2, the solid content of the final product is: 73%

[0029] In the reaction flask equipped with a thermometer, a stirrer and a reflux condenser, sequentially add the E51 epoxy resin, bisphenol A type phenolic resin, bisphenol A and the first part of methyl isobutyl ketone in the formula amount. After the feeding is complete, start stirring and heat the reaction system to 150° C. and keep it warm. After adding dimethylbenzylamine, the temperature is raised to 150° C., and continue to react for 2 hours at this temperature. When the epoxy equivalent of the reaction system reaches the theoretical value ( EEW=1500), start to lower the temperature; when the system temperature drops below 100°C, add N-methylethanolamine and ketimine, the second part of methyl isobutyl ketone into the reaction s...

Embodiment 2

[0030] The preparation of embodiment 2 polyether phosphate

[0031]

[0032] Add polyphosphoric acid and polyether polyol sequentially into a reaction flask equipped with a thermometer, a stirrer and a reflux condenser, heat up to 80°C, and stir for 5 hours. After cooling down to room temperature, add 5 times more water to the four-neck flask, then add the phosphate ester made before, raise the temperature to 80°C, stir for 4 hours, and then cool down to room temperature. Then add ethyl acetate, after fully shaking, pour into the separatory funnel to stand for stratification, pour off the lower part of the water, then add saturated saline, shake fully, then let stand to separate the lower layer of water, and then add anhydrous sodium sulfate Dry until the solution becomes clear, filter out sodium sulfate, and finally use a rotary evaporator to remove the solvent by rotary evaporation to obtain polyether phosphate.

[0033]

[0034]

[0035] * Prepared by the reaction...

Embodiment 3

[0037] The preparation of embodiment 3 curing agent

[0038]

[0039] Add the formulated amount of 4,4`-diphenylmethane diisocyanate and dibutyltin dilaurate into the reaction flask equipped with a thermometer, stirrer and reflux condenser, stir and heat up to 60°C and start to add ethylene glycol mono For butyl ether, cool down with a water bath during the dropwise addition and control the temperature not to exceed 65°C. After the dropwise addition, continue to react at 80°C for 2 hours, and use the standard di-n-butylamine back titration method to analyze the remaining isocyanate group content in the reaction system. When the remaining isocyanate content is less than 0.2%, methyl isobutyl ketone is added for dilution to obtain a fully blocked isocyanate crosslinking agent with a final solid content of 80%.

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Abstract

The invention relates to cathode electrophoretic paint with environment-friendly pretreatment and high matching performance and a preparation method. The electrophoretic paint mainly comprises phenolic resin modified epoxy resin and phosphate ester modified epoxy resin. The preparation method has the beneficial effects that epoxy resin is introduced by adopting phenolic resin, so that the wet filmresistance is improved. The polyether phosphate is adopted to modify the epoxy resin, so that the wet adhesive force of a paint film can be effectively improved, and the epoxy resin can be toughenedto adapt to environment-friendly pretreatment. Through a method of mixing two kinds of modified epoxy resin, the electrophoretic paint with environment-friendly pretreatment and high matching performance is prepared.

Description

[technical field] [0001] The invention relates to an electrophoretic paint, in particular to a cathodic electrophoretic paint with environmental protection pretreatment and high matching performance and a preparation method. [Background technique] [0002] Due to its low VOC, high utilization rate, environmental protection and excellent anti-corrosion performance, electrophoretic coatings are widely used in hardware, home appliances and other fields, especially in auto parts and car bodies, which almost reach 100%. With the national requirements for environmental protection in recent years, those who used phosphating pretreatment before have turned to environmental protection pretreatment, mainly silane pretreatment and zirconium pretreatment, especially with the popularity of new energy vehicles, the use of environmental protection in the automotive industry Pre-processing will also become a trend. However, through experimental verification and many literature reports, mos...

Claims

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Application Information

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IPC IPC(8): C09D187/00C09D5/44C08G81/00
CPCC08G81/00C08L2205/025C09D5/4419C09D5/4473C09D187/005C08L87/005
Inventor 陈豪杰刘薇薇赵颖郭辉叶金翔许亚程周坤
Owner HAOLISEN CHEM TECH (JIANGSU) CO LTD
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