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
5 Cites 10 Cited by

AI-Extracted 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-c...
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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.

Application Domain

Anti-corrosive paintsPaints for electrolytic applications +3

Technology Topic

Image

  • 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

Examples

  • Experimental program(8)

Example Embodiment

[0032] Example 1 Preparation of main resin
[0033]
[0034] *Prepared by reacting diethylenetriamine and methyl isobutyl ketone in a molar ratio of 1:2, the solid content of the final product is 73%
[0035] In a reaction flask equipped with a thermometer, a stirrer and a reflux condenser, add the formula amount of E51 epoxy resin, bisphenol A and the first part of methyl isobutyl ketone in sequence. After the addition is complete, start stirring and heat the reaction system to 120°C and keep it warm. After adding triphenylphosphine, raise the temperature to 150°C, and continue the reaction at this temperature for 1 hour. When the epoxy equivalent of the reaction system reaches the theoretical value (EEW =1140.5), start to cool down; when the system temperature drops below 100°C, add N-methylethanolamine and ketimine, and the second part of methyl isobutyl ketone into the reaction system, and then raise the temperature to 120°C again, The reaction was continued at this temperature for 2 hours; after the reaction, the temperature of the reaction system was lowered to 70° C. to obtain the main resin with a final solid content of 85.0%.

Example Embodiment

[0036] Example 2 Preparation of curing agent
[0037]
[0038] Add the formula amount of 4,4`-diphenylmethane diisocyanate and dibutyltin dilaurate into the reaction flask equipped with thermometer, stirrer and reflux condenser, stir and warm up to 60℃, then start to add glycol mono For butyl ether, reduce the temperature in a water bath during the dripping process and control the temperature to not exceed 65°C. After the dripping is completed, continue to react at 80°C for 2h. Use standard di-n-butylamine back titration to analyze the remaining isocyanate group content in the reaction system. When the remaining isocyanate group content is less than 0.2%, methyl isobutyl ketone is added to dilute to obtain a fully blocked isocyanate crosslinking agent with a final solid content of 80%.

Example Embodiment

[0039] Example 3 Preparation of microcapsules
[0040] In a four-necked flask equipped with a thermometer, a stirrer and a reflux condenser, 296 g of E51 epoxy resin (EEW ​​= 185), 106 g of bisphenol A, 45 g of methyl isobutyl ketone, and 0.6 g of triphenyl phosphine were sequentially added, and the temperature was increased. After 145-155℃, heat preservation for 2h, after measuring epoxy equivalent 670, add 126g silane coupling agent KH-550, 86g methyl isobutyl ketone, react for 2 hours, reaction temperature 120-125℃, then vacuum dry and Keep sealed. Add 30 g of urea and 150 g of 37% formaldehyde into a four-necked flask, stir and mix thoroughly, then adjust the pH to 8.0-9.0 with triethanolamine, and raise the temperature to 70° C. until all are dissolved to obtain a colorless and transparent prepolymer. Then cool to room temperature, add 3g of ammonium chloride, 4g of resorcinol, 3.5g of sodium chloride and 1.3g of OP-10 emulsifier to the prepolymer. After stirring and dissolving completely, adjust the pH to 7.0 with triethanolamine. Then add KH-550 modified epoxy resin, stir 500r/min, emulsify for 1h; then adjust the pH to 3 with dilute hydrochloric acid, and slowly raise the temperature to 60℃, keep it for 2h, after the reaction, wash and filter , Dry to obtain powdery microcapsules.
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PUM

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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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