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Microcapsule, self-healing electrophoretic coating containing microcapsule and preparation method of microcapsule

A technology for electrophoretic coatings and microcapsules, applied in electrophoretic coatings, microcapsule preparations, microsphere preparation, etc., can solve the problems of micro-cracks in the paint film, internal damage, and reduce the protection function of the coating, and achieve small particle size and good stability. , Improve the effect of overall anti-corrosion

Inactive Publication Date: 2017-02-15
HAOLISEN COATING SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the coating or use of the workpiece, due to problems such as bumps and scratches, the paint film on the surface of the workpiece will have micro-cracks or internal damage, which greatly reduces the protective function of the paint and affects the overall anti-corrosion performance of the paint film.

Method used

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  • Microcapsule, self-healing electrophoretic coating containing microcapsule and preparation method of microcapsule
  • Microcapsule, self-healing electrophoretic coating containing microcapsule and preparation method of microcapsule
  • Microcapsule, self-healing electrophoretic coating containing microcapsule and preparation method of microcapsule

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation of embodiment 1 host resin

[0033]

[0034] * 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%

[0035] In the reaction bottle equipped with a thermometer, a stirrer and a reflux condenser, add the E51 epoxy resin, bisphenol A and the first part of methyl isobutyl ketone in the prescribed amount in sequence. After the feeding is complete, start stirring and heat the reaction system to 120°C and keep it warm, add triphenylphosphine and raise the temperature to 150°C, and continue the reaction at this temperature for 1h. When the epoxy equivalent of the reaction system reaches the theoretical value (EEW =1140.5), began to cool down; when the system temperature dropped below 100°C, N-methylethanolamine and ketimine, the second part of methyl isobutyl ketone were added to the reaction system, and the temperature was raised to 120°C again, The reaction was co...

Embodiment 2

[0036] The preparation of embodiment 2 curing agent

[0037]

[0038] 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%.

Embodiment 3

[0039] The preparation of embodiment 3 microcapsules

[0040] In the four-necked flask equipped with thermometer, stirrer and reflux condenser, add E51 epoxy resin (EEW=185) 296g, bisphenol A106g, methyl isobutyl ketone 45g, triphenylphosphine 0.6g successively, heat up After 145-155°C, keep it warm for 2 hours. After measuring the epoxy equivalent of 670, add 126g of silane coupling agent KH-550, 86g of methyl isobutyl ketone, react for 2 hours, the reaction temperature is 120-125°C, then vacuum dry and dry Keep airtight. Add 30g of urea and 150g of 37% formaldehyde into a four-neck flask, stir and mix thoroughly, then adjust the pH value to 8.0-9.0 with triethanolamine, and raise the temperature to 70°C until completely dissolved to obtain a colorless and transparent prepolymer. Then cool down to room temperature, add ammonium chloride 3g, resorcinol 4g, sodium chloride 3.5g and OP-10 emulsifier 1.3g in the prepolymer, after stirring and dissolving completely, adjust the pH...

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Abstract

The invention relates to a microcapsule, a self-healing electrophoretic coating containing the microcapsule and a preparation method of the microcapsule. The microcapsule mainly takes urea formaldehyde resin or melamine resin as a capsule wall and silane coupling agent modified epoxy resin as a capsule core. The microcapsule has the beneficial effects that the microcapsule is prepared by in situ polymerization, takes the urea formaldehyde resin or melamine resin as the capsule wall and the silane coupling agent modified epoxy resin as the capsule core, and has the advantages of being good in microcapsule toughness, not easy to damage, small in particle size and good in stability. After an electrophoretic coating is introduced into the microcapsule, micro cracks or damage of a paint film can be self-healed, so as to improve the overall corrosion resistance of the paint film.

Description

[0001] [technical field] [0002] The invention relates to electrophoretic coatings, in particular to microcapsules, self-healing electrophoretic coatings containing microcapsules and a preparation method. [0003] [Background technique] [0004] Due to the advantages of low environmental pollution, high utilization rate, high degree of automation, and excellent performance, electrophoretic coatings have received more and more attention in the field of industrial coatings. With the continuous development of industry, the performance requirements for coatings are also getting higher and higher. Especially anti-corrosion requirements are getting higher and higher. During the coating or use of the workpiece, due to problems such as bumps and scratches, the paint film on the surface of the workpiece will have micro-cracks or internal damage, which greatly reduces the protective function of the paint and affects the overall corrosion resistance of the paint film. Therefore, it is n...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/08C09D5/44C09D7/12C08G59/14C08G59/40B01J13/18
CPCB01J13/18B01J13/185C08G59/1433C08G59/4028C08L2205/025C08L2205/03C09D5/08C09D5/4457C09D163/00C08L63/00C08L61/24C08L61/28
Inventor 陈豪杰刘薇薇苏献兰郭辉黄磊唐志文叶金翔
Owner HAOLISEN COATING SHANGHAI
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