Self-repairing microcapsule, self-repairing electromagnetic shielding repairing putty and preparation method
A self-healing microcapsule, electromagnetic shielding technology, applied in the directions of microcapsule preparation, microsphere preparation, conductive coating, etc., can solve the problems of easy sedimentation of conductive fillers, high density of self-healing shielding putty, etc., and achieves short and good storage time. The effect of electrical conductivity and low density
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[0028] According to a typical embodiment of the present invention, a method for preparing the above self-healing microcapsules is provided. The preparation method comprises the following steps: mixing and reacting graphene oxide and wall material raw materials to prepare a wall material prepolymer; preparing a dispersion of allyl methyl disulfide grafted epoxy resin, and then adding a dispersant, carbon nano The tube and the emulsifier form an oil-in-water emulsified solution, that is, the core material; and pour the core material into the wall material prepolymer, add a water-resistant modifier, adjust the pH value to 2.5-3.5, and heat up to 55-65C for reaction, preferably at 60° C. to obtain a suspension of microcapsules, which is washed, filtered and dried to obtain self-healing microcapsules. Typically, the wall material raw materials are urea and formaldehyde; preferably, the wall material raw materials also contain carbon nanotubes and dispersants. The water resistance ...
Embodiment 1
[0034] 1 Preparation of microcapsule wall material prepolymer
[0035] Weigh 25g of urea and 50ml of formaldehyde aqueous solution into a three-necked flask, stir and dissolve, add 15ml of graphene oxide dispersion with a concentration of 20g / L, stir ultrasonically for 30min, adjust the pH of the solution to 8-9 with triethanolamine, The temperature was raised to 65°C for 1 hour to prepare a conductive wall material prepolymer.
[0036] 2 Preparation of intrinsic self-healing core material emulsion
[0037] Take by weighing 6g sodium dodecylbenzene sulfonate, be dissolved in 100ml deionized water, obtain the emulsifier with water-phase oil-phase double group; Get 30g epoxy resin and dissolve with n-butanol, join in the place that thermometer is housed, stir Add the initiator dibenzoyl peroxide with 2% mass fraction of epoxy resin to the four-necked flask of condenser and condenser tube, raise the temperature of the system to 90-100°C, slowly add 10% mass fraction of epoxy res...
Embodiment 2
[0045] 1 Preparation of microcapsule wall material prepolymer
[0046] Weigh 25g of urea and 50ml of formaldehyde solution into a three-necked flask, stir and dissolve, add 30ml of graphene oxide dispersion with a concentration of 20g / L, 1g of carbon nanotubes and 0.2g of dispersant, and ultrasonically stir for 30min. Ethanolamine adjusts the pH of the solution to 8-9, and raises the temperature to 65° C. for 1 hour to prepare a conductive wall material prepolymer.
[0047] 2 Preparation of intrinsic self-healing core material emulsion
[0048] Take by weighing 5g sodium dodecylbenzene sulfonate, be dissolved in 100ml deionized water, obtain the emulsifier with water phase oil phase double group; Get 30g epoxy resin (127 epoxy resins and 1564 epoxy resins by weight 1:1 mixture) is dissolved with n-butanol, joins in the four-necked flask that thermometer, stirrer, condenser are housed, then adds the initiator dibenzoyl peroxide of epoxy resin quality 2%, the system temperature...
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