A kind of large particle diameter polyurethane phase change microcapsule and preparation method thereof
A phase change microcapsule, polyurethane technology, applied in the directions of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problems of fast reaction rate, difficulty in microcapsule washing, purification, depending on preparation conditions, etc., and achieve violent reaction. The degree of reduction is beneficial to the exchange of heat energy, and the effect of optimizing the preparation process
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Embodiment 1
[0040] A preparation method for large-diameter polyurethane phase-change microcapsules, comprising the following steps:
[0041] (1) Dissolve 25.00 g of isophorone diisocyanate and 5.00 g of polyethylene glycol (molecular weight 400) in 25.00 g of ethyl acetate, drop into 0.4 mL of dibutyltin dilaurate, under nitrogen protection, 50°C Under the condition of reaction 1 h, then add 110.40 g methyl laurate, obtain oily phase.
[0042] (2) Add 3 g of 20 wt% nano-titanium dioxide aqueous dispersion to 997 g of water to obtain 1000 g of nano-titanium dioxide aqueous dispersion with a concentration of 0.06 wt%, then add 5.00 g of pentaerythritol and stir well.
[0043] (3) Slowly add the oil phase prepared in step (1) into the dispersion prepared in step (2) under stirring at 300 rpm, continue stirring, and raise the temperature to 60 °C for 2.5 h.
[0044] (4) After the reaction is completed, the solid powder of polyurethane phase change microcapsules is obtained by suction filtrat...
Embodiment 2
[0046] A preparation method for large-diameter polyurethane phase-change microcapsules, comprising the following steps:
[0047](1) Dissolve 11.00 g of 2,4-toluene diisocyanate and 14.00 g of polytetrahydrofuran (molecular weight: 1000) in 25.00 g of toluene, drop into 0.2 mL of dibutyltin dilaurate, and react under nitrogen protection at 50 °C 1 h, and then add 128.80 g of n-octadecane to obtain an oily phase.
[0048] (2) Add 50.00 g of rutile nano-titanium dioxide to 1000.00 g of water, then add 27.50 g of glycerin, and stir well.
[0049] (3) Slowly add the oil phase prepared in step (1) into the dispersion prepared in step (2) under stirring at 400 rpm, continue stirring, and raise the temperature to 50 °C for 4 h.
[0050] (4) After the reaction is completed, filter with suction, wash with distilled water, and dry to obtain a solid powder of polyurethane phase change microcapsules. The average particle size is 103 μm, which can withstand 8000 rpm centrifugal washing and...
Embodiment 3
[0052] A preparation method for large-diameter polyurethane phase-change microcapsules, comprising the following steps:
[0053] (1) Dissolve 18.90 g of hexamethylene diisocyanate, 28.14 g of diphenylmethane diisocyanate and 50.00 g of polypropylene glycol (molecular weight 1000) in 48.53 g of ethyl acetate, drop into 0.3 mL of dibutyltin dilaurate, in Under nitrogen protection, the reaction was carried out at 50°C for 1 h, and then 147.2 g of butyl stearate was added to obtain an oil phase.
[0054] (2) Add 20.00 g of anatase nano-titanium dioxide to 1000.00 g of water, then add 50.00 g of trimethylolpropane, and stir well.
[0055] (3) Take the oil phase prepared in step (1) and slowly add it to the dispersion liquid prepared in step (2) under stirring at 250 rpm, continue stirring, and raise the temperature to 70 °C for 2 h.
[0056] (4) After the reaction is completed, filter with suction, wash with distilled water, and dry to obtain a solid powder of polyurethane phase c...
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