Thermoplastic cellulose-based solid-solid phase transition material and preparation method thereof
A cellulose-based, phase-change material technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of high cost of raw materials, cellulose does not have the function of heat energy storage and release, etc., to achieve fast reaction speed, reliable Good melt processability and good applicability
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[0036] Example 1
[0037] The microcrystalline cellulose was dried in a vacuum drying oven at 40°C for 36 hours.
[0038] The toluene-2,4-diisocyanate and polyethylene glycol n-tetradecyl ether HO(CH 2 CH 2 O) 20 C 14 H 29 They were dissolved in N’N-dimethylformamide to prepare a toluene-2,4-diisocyanate solution with a concentration of 6mol% and HO(CH 2 CH 2 O) 20 C 14 H 29 Solution; then HO(CH 2 CH 2 O) 20 C 14 H 29 The solution was added to the toluene-2,4-diisocyanate solution in 3 times, toluene-2,4-diisocyanate and polyethylene glycol n-tetradecyl ether HO(CH 2 CH 2 O) 20 C 14 H 29 The molar ratio is 1:1, the crosslinking agent (toluene-2,4-diisocyanate) is added with 0.01% catalyst dioctyltin mercaptan, and the reaction is carried out at 70°C and a stirring rate of 500r / min for 6 hours to obtain a pre- Polymer solution.
[0039] Dissolve microcrystalline cellulose in ionic liquid 1-allyl-3-methylimidazole chloride at 80°C to obtain a solution A with a concentration of 10wt% mi...
Example Embodiment
[0042] Example 2
[0043] The cellulose acetate was dried in a vacuum drying oven at 30°C for 48 hours.
[0044] Combine diphenylmethane diisocyanate and polyethylene glycol n-octadecyl ether HO(CH 2 CH 2 O) 100 C 18 H 37 Dissolved in dimethyl sulfoxide to prepare a 2mol% diphenylmethane diisocyanate solution and a 9mol% polyethylene glycol n-octadecyl ether solution; then the HO(CH 2 CH 2 O) 100 C 18 H 37 The solution is added dropwise to the diphenylmethane diisocyanate solution, the molar ratio of diphenylmethane diisocyanate and polyethylene glycol n-octadecyl ether is 1:1, and the crosslinking agent (diphenylmethane diisocyanate) mass is 2.0% The catalyst dioctyltin mercaptan is reacted for 8 hours at 60°C and a stirring rate of 600r / min to obtain a prepolymer solution.
[0045] The cellulose acetate was dissolved in the ionic liquid propylpyridinium chlorate at 65°C to obtain a solution A with a cellulose acetate concentration of 1wt%, and then the prepolymer solution was added...
Example Embodiment
[0047] Example 3
[0048] The cyanoethyl cellulose was dried in a vacuum drying cabinet at room temperature for 48 hours.
[0049] Combine methylene bisacrylamide and polyethylene glycol n-docosyl ether (HO(CH 2 CH 2 O) 2 C 22 H 45 ) Dissolve in ethylene glycol monoethyl ether, prepare 2mol% methylene bisacrylamide solution and 8mol% polyethylene glycol n-docosyl ether solution, and then mix the polyethylene glycol n-22 The alkyl ether solution was added to the methylene bis acrylamide solution in 10 times, the molar ratio of methylene bis acrylamide to polyethylene glycol n-behenyl ether was 1:1, and the crosslinking agent (methylene Bisacrylamide) 0.05% by weight of the catalyst dibutyltin dilaurate was reacted for 8 hours at 35°C and a stirring rate of 600r / min to obtain a prepolymer solution.
[0050] The cyanoethyl cellulose was dissolved in the ionic liquid 1-butyl-3-methyl-imidazole chloride at 65°C to obtain a solution A with a cyanoethyl cellulose concentration of 30wt%, an...
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