Preparation method of phase-change energy-storing capsule adopting non-isocyanate polyurethane as capsule walls
A non-isocyanate, non-isocyanate technology for capsule walls, applied in the field of phase change energy storage materials and their preparation, can solve the problems of complex preparation process, poor flame retardancy, leakage of phase change materials, etc., achieves simple process, enhanced mechanical properties, The effect of avoiding leakage
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Embodiment 1
[0030] 1. Preparation of alginate-based shape-setting phase change materials
[0031] Add 2.0g of styrene maleic anhydride emulsifier into 100.0g of water and mix uniformly to obtain an emulsifier aqueous solution A, then melt 20.0g of n-octadecane and add it to the emulsifier aqueous solution A, and emulsify at a high speed for 3 minutes at 5000rpm, the system The temperature was kept at 40° C., and a stable emulsion B was prepared, the appearance of which was a milky white opaque liquid. Add 120 g of sodium alginate aqueous solution into the above emulsion B, stir well, and let stand for 30 minutes to defoam to obtain viscous emulsion C. The sodium alginate aqueous solution is prepared according to the weight ratio of sodium alginate: water = 2:98.
[0032] Then use an orifice device to add emulsion C dropwise to CaCl under stirring at 10-500rpm 2 In the coagulation bath, alginate-based shape-fixed phase-change material particles are taken out after solidification and mold...
Embodiment 2
[0038] Weigh 50 parts by mass of n-octadecane, add 50 parts by mass of high-density polyethylene, stir and mix, blend and granulate through a twin-screw extruder to obtain a cylindrical n-octadecane / polyethylene composite shape-setting phase change material particles.
[0039] Add the obtained particles into diethylenetriamine and soak for 100 minutes, and take out the air-dried surface for later use.
[0040] Put 100 g of surface-treated shape-changing material particles into 150 g of cyclocarbonate monomer solution under stirring at 60 rpm, and react at 40° C. for 5 hours, and a layer of surface-treated shape-changing material particles is formed on the surface After non-isocyanate polyurethane, the product is filtered, washed, and air-dried to obtain a phase-change energy storage capsule with non-isocyanate polyurethane as the capsule wall. Wherein, the cyclocarbonate monomer solution is prepared according to the mass ratio of cyclocarbonate and ethyl acetate of 7:1.
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Embodiment 3
[0043] Weigh 60 parts by mass of No. 30 paraffin, add 40 parts by mass of polystyrene, stir and mix, blend and granulate through a twin-screw extruder to obtain cylindrical n-octadecane / polyethylene composite shape-setting phase change material particles.
[0044] The obtained granules were added into tetraethylenepentamine and soaked for 60 minutes, and the air-dried surface was taken out for later use.
[0045] Put 500g of surface-treated shape-fixed phase-change material particles into 750g cyclocarbonate monomer solution under stirring at 60rpm, and react at 60°C for 5 hours, and a layer of non- After isocyanate polyurethane, the product is filtered, washed, and air-dried to obtain a phase-change energy storage capsule with non-isocyanate polyurethane as the capsule wall. Wherein, the cyclocarbonate monomer solution is prepared according to the mass ratio of cyclocarbonate and ethyl acetate of 6:1.
[0046] The thermal properties of the shaped phase change material capsul...
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