Phase-change microcapsules based on inorganic shell and its manufacturing method and application
A technology of phase change microcapsules and a manufacturing method, which is applied in the directions of microcapsule preparation, microsphere preparation, chemical instruments and methods, etc., can solve the problems of not being able to take into account the encapsulation effect and enthalpy retention rate, etc., and achieve excellent enthalpy value. Retention rate, structural stability, the effect of meeting the needs of environmental friendliness
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[0105] There is no particular limitation on the preparation method of Janus particles, and Janus particles can be prepared by methods commonly used in the art. For example, it can be prepared by surface selective modification, emulsion polymerization, seed emulsion polymerization, phase separation, microfabrication and self-assembly, dispersion polymerization, etc.
[0106] In some preferred embodiments, the preparation method of Janus particles of the present invention can refer to the preparation method of Janus particles disclosed in Chinese patent application CN105440218A, for example. Specifically, the preparation method of the Janus particles of the present invention comprises the following steps: dispersing the polymer particles in water to obtain a seed solution; emulsifying a silane coupling agent, an emulsifier, an initiator, etc. and adding them to the seed solution; The polymerization reaction is carried out to obtain a suspension of Janus particles; the obtained s...
Embodiment 1
[0182] SiO 2 - Preparation of PS Janus particles
[0183] 0.15 g of azobisisobutyronitrile (AIBN) was dissolved in 15.00 g of divinylbenzene (DVB), and 0.15 g of sodium dodecyl sulfate (SDS) was dissolved in 800.00 g of water. The above two solutions were mixed and ultrasonically emulsified for 3 minutes to obtain DVB monomer emulsion. Then 25.00 g of freeze-dried HP-433 polystyrene (PS) hollow spheres were dispersed into the above-mentioned monomer emulsion. Stir at room temperature for 8 hours to induce DVB to swell PS hollow spheres. Then the temperature was raised to 70° C. and reacted for 12 hours to obtain a cross-linked PS hollow sphere dispersion. Finally, dry powder of seed balls was obtained by washing with ethanol and water and freeze-drying. Disperse 10.00 g of dry powder of seed balls in 200.00 g of water, and raise the temperature of the system to 70°C. Add 6.00g of 3-(methacryloyloxy)propyltrimethoxysilane (MPS), 6.00g of 1wt% potassium persulfate (KPS)...
Embodiment 2
[0190] SiO 2 - Preparation of PS Janus particles
[0191] SiO 2 -PS Janus particles were prepared similarly to Example 1, except that the amount of 3-(methacryloxy)propyltrimethoxysilane (MPS) used was changed to obtain larger silica ends. The specific steps are as follows: 0.15 g of azobisisobutyronitrile (AIBN) was dissolved in 15.00 g of divinylbenzene (DVB), and 0.15 g of sodium dodecyl sulfate (SDS) was dissolved in 800.00 g of water. The above two solutions were mixed and ultrasonically emulsified for 3 minutes to obtain DVB monomer emulsion. Then 25.00 g of freeze-dried HP-433 polystyrene (PS) hollow spheres were dispersed into the above-mentioned monomer emulsion. Stir at room temperature for 8 hours to induce DVB to swell PS hollow spheres. Then the temperature was raised to 70° C. and reacted for 12 hours to obtain a cross-linked PS hollow sphere dispersion. Finally, dry powder of seed balls was obtained by washing with ethanol and water and freeze-drying. ...
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