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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

Active Publication Date: 2014-01-01
TIANJIN POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two invention patent applications are based on cellulose derivatives, the cost of raw materials is high, and only thermoplastic modification is performed on cellulose, which is not a solid-solid phase change material, and the modified cellulose does not have thermal energy storage with release function

Method used

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  • Thermoplastic cellulose-based solid-solid phase transition material and preparation method thereof
  • Thermoplastic cellulose-based solid-solid phase transition material and preparation method thereof
  • Thermoplastic cellulose-based solid-solid phase transition material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The microcrystalline cellulose was dried in a vacuum oven at 40 °C for 36 h.

[0038] Toluene-2,4-diisocyanate and polyethylene glycol n-tetradecyl ether HO (CH 2 CH 2 O) 20 C 14 h 29 Dissolve in N'N-dimethylformamide respectively, prepare toluene-2,4-diisocyanate solution with a concentration of 6mol% and HO(CH with a concentration of 12mol%) 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 into 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, add the crosslinking agent (toluene-2,4-diisocyanate) mass 0.01% catalyst dioctyltin mercaptide, and react for 6h at 70°C with a stirring speed of 500r / min to obtain the pre- polymer solution.

[0039] Dissolve microcrystalline cellulose in ionic liquid 1-allyl-3-methylimidazolium chloride salt at 80°C to obtain A solution with a microcrystalline cell...

Embodiment 2

[0043] The cellulose acetate was dried in a vacuum oven at 30 °C for 48 h.

[0044] Diphenylmethane diisocyanate and polyethylene glycol n-octadecyl ether HO (CH 2 CH 2 O) 100 C 18 h 37 Diphenylmethane diisocyanate solution and 9mol% polyethylene glycol n-stearyl ether solution were dissolved in dimethyl sulfoxide to prepare a concentration of 2mol%; then 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 to polyethylene glycol n-octadecyl ether is 1:1, and the mass of crosslinking agent (diphenylmethane diisocyanate) is added at 2.0% The catalyst dioctyltin mercaptide was reacted for 8 hours at 60°C and the stirring speed was 600r / min to obtain a prepolymer solution.

[0045] Dissolve cellulose acetate in ionic liquid propylpyridinium chlorate at 65°C to obtain A solution with a cellulose acetate concentration of 1 wt%, and then add the prepolymer solution to A sol...

Embodiment 3

[0048] The cyanoethyl cellulose was dried in a vacuum oven at room temperature for 48 h.

[0049] Methylenebisacrylamide and polyethylene glycol n-behenyl ether (HO(CH 2 CH 2 O) 2 C 22 h 45 ) was dissolved in ethylene glycol monoethyl ether to prepare a solution of methylenebisacrylamide with a concentration of 2mol% and a solution of polyethylene glycol n-docosyl ether with a concentration of 8mol%, and then the polyethylene glycol n-behenyl ether The alkyl ether solution was added into the methylene bisacrylamide solution in 10 times, the molar ratio of methylene bisacrylamide to polyethylene glycol n-docosyl ether was 1:1, and a crosslinking agent (methylene bisacrylamide Bisacrylamide) with 0.05% by weight of the catalyst dibutyltin dilaurate was reacted for 8 hours at 35°C with a stirring rate of 600r / min to obtain a prepolymer solution.

[0050] Dissolve cyanoethylcellulose into the ionic liquid 1-butyl-3-methyl-imidazolium chloride salt at 65°C to obtain a solution...

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Abstract

The invention discloses a thermoplastic cellulose-based solid-solid phase transition material and a preparation method thereof. The preparation method comprises the following steps: 1, drying cellulose or a cellulose derivative; 2, respectively dissolving a cross-linking agent and polyethylene glycol alkyl ether in an organic solvent I to obtain a cross-linking agent solution and a polyethylene glycol alkyl ether solution, adding the polyethylene glycol alkyl ether to the cross-linking agent solution in a dropwise manner, adding a catalyst, and reacting for 0.5-10h to obtain a prepolymer solution, wherein a mole ratio of the polyethylene glycol alkyl ether to the cross-linking agent is 1:1; and 3, dissolving cellulose in an ionic liquid to obtain a cellulose solution, adding the prepolymer solution, acid anhydride and a catalyst to the above obtained cellulose solution, carrying out a polymerization reaction for 2-24h to obtain a finally obtained mixture, adding the finally obtained mixture to deionized water or an organic solvent II for precipitation, repeatedly washing the above obtained precipitate with deionized water 2-3 times, and carrying out vacuum drying to obtain the thermoplastic cellulose-based solid-solid phase transition material. The phase transition material has a good thermal stability and a melting processing performance, and can be blended with a thermoplastic copolymer matrix for melting processing.

Description

technical field [0001] The invention relates to the field of phase change materials, in particular to a cellulose-based solid-solid phase change material with thermal energy storage and release functions and a preparation method thereof. Background technique [0002] During the phase change process, phase change materials can absorb or release a large amount of latent heat, and are widely used in aerospace, HVAC, energy-saving buildings, solar energy utilization, electrical cooling, waste heat recovery, clothing and insulation materials, etc. aspect is also important. Solid-solid phase change material is a kind of phase change material, which is always in a solid state during the phase change process, with small volume change and no liquid leakage, so it has important applications in many fields. [0003] Chinese invention patent (CN1616588A) discloses a polymer phase change material polyvinyl alcohol with two active end groups and polyethylene glycol with one active end gr...

Claims

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Application Information

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IPC IPC(8): C09K5/02C08G81/00
Inventor 韩娜张兴祥王乐军于万永石海峰王栋
Owner TIANJIN POLYTECHNIC UNIV
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