A self-healing and self-lubricating dual-function microcapsule and its preparation method
A microcapsule, dual-function technology, applied in the field of self-lubricating and self-repairing dual-function microcapsules and their preparation, can solve the problems of microcapsules in the initial stage, and achieve good lubricating performance, wide application prospects, and improved service life. Effect
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Embodiment 1
[0017] Single-layer core-shell structure microcapsules: In a three-neck round-bottomed flask (1 L) equipped with a mechanical stirring paddle, add 250 mL of an aqueous surfactant system (0.2 wt.% SDBS, 0.1 wt.% PVA-124). Place the flask in a water bath at 35°C, stirring constantly. Add urea, resorcinol, and ammonium chloride, adjust the pH to 3.5 with glacial acetic acid, add a mixture of 6g DBP and 6g PAO6, and stabilize for 10min to form a stable oil-in-water microemulsion. After that, 6.4g of 37% formaldehyde solution was added, the temperature was raised to 55°C, and the stirring was continued for 6h. After the reaction finished, the flask was taken out from the water bath and cooled down to room temperature, washed, filtered, and dried at room temperature to obtain microcapsule particles, the product such as figure 1 As shown, a small amount of product was dispersed in deionized water, a scanning electron microscope sample was prepared, and the morphology of the product ...
Embodiment 2
[0019] Single-layer core-shell structure microcapsules: 0.3g of modified nano-silica was added to 50ml of deionized water, and ultrasonically dispersed for 10 minutes to obtain a nano-silica dispersion; the oil phase mixture (5g methyl methacrylate, 0.25g Azobisisobutyronitrile, 3g of triethylenetetramine and 1g of linseed oil) were added to the dispersion, and emulsified at high speed for 3min to form a Pickering emulsion. Subsequently, the obtained emulsion was transferred to a 100ml three-necked flask, N 2 Under protection, the temperature was raised to 80°C for 10 hours. After the reaction, the flask was taken out from the water bath and cooled down to room temperature, washed, filtered and dried at room temperature to obtain microcapsule particles.
Embodiment 3
[0021] Multi-layer composite structure microcapsules: (1) 37% formaldehyde solution, urea, and melamine with a mass ratio of 13:5:1 are added to a 500mL three-necked flask with a condensation device, and triethanolamine is added dropwise to adjust the pH to 9. React at 70°C for 1 hour to prepare a prepolymer solution, and cool it down for later use. (2) In a three-necked round-bottomed flask (1L) equipped with a mechanical stirring paddle, add 250mL of an aqueous surfactant system (0.5wt.% gum arabic, 0.1wt.% PVA-124) and 4g of triethylenetetramine, Stir to obtain a stable emulsion. Add the prepolymer into the emulsion, stir and emulsify for 30 minutes, adjust the pH to 4 with glacial acetic acid, and after the microcapsules are completely formed, raise the temperature to 60°C, solidify for a certain period of time, and wash the obtained suspension with ethanol several times and suction filtration to obtain single-layer microcapsules for use. (3) A certain quality of polysty...
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