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Solid-solid phase change material based on cellulose acrylate and preparation method of solid-solid phase change material

An acrylate-based, phase-change material technology, applied in fiber chemical characteristics, heat exchange materials, chemical instruments and methods, etc., can solve the problems of low heat enthalpy of grafted products, high phase transition temperature of solid-solid phase change materials, etc. , to achieve the effect of fewer internal defects in the fiber, more changes in the cross-sectional structure of the fiber, and easy industrial implementation

Inactive Publication Date: 2018-08-03
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grafts of solid-solid phase change materials based on cellulose mainly include polyethylene glycol and fatty acids; in the preparation process of this kind of phase change materials, crosslinking agents such as diisocyanates are usually used, which have strong toxicity, and Fixed grafting sites (both with three hydroxyl groups as grafting sites) lead to low average enthalpy per mole of grafted products, and the phase transition temperature of the prepared solid-solid phase change material is high, which is not within the controllable range of human body temperature Inside (i.e. 20-50°C)

Method used

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  • Solid-solid phase change material based on cellulose acrylate and preparation method of solid-solid phase change material
  • Solid-solid phase change material based on cellulose acrylate and preparation method of solid-solid phase change material
  • Solid-solid phase change material based on cellulose acrylate and preparation method of solid-solid phase change material

Examples

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Effect test

Embodiment 1

[0051] A preparation method of a cellulose-based copolymer solid-solid phase change material, comprising the steps of:

[0052] 1) Dry the microcrystalline cellulose in a vacuum oven at 60°C for 12 hours; take a certain amount of dried microcrystalline cellulose and dissolve it in dimethyl sulfoxide / paraformaldehyde (DMSO / PF) (wherein, DMSO and PF The mass ratio is 12:1) in the solution, the concentration of microcrystalline cellulose is 8wt%, mechanical stirring is performed at 95°C until it becomes a homogeneous system to obtain a cellulose solution;

[0053] 2) preparing the first monomer, the specific steps are as follows:

[0054] The cellulose solution was cooled to room temperature, and acryloyl chloride was added dropwise to the cellulose solution in an ice-water bath for reaction, wherein the molar ratio of cellulose to acryloyl chloride was 1:3. After the dropwise addition was completed, the reaction mixture was left at room temperature to react. After 3h the solut...

Embodiment 2

[0062] A preparation method of a cellulose-based copolymer solid-solid phase change material, comprising the steps of:

[0063] 1) Dry the linters in a vacuum oven at 60°C for 12 hours; take a certain amount of dried linters and dissolve them in 1-allyl-3-methylimidazolium chloride (AmimCl) solution. The concentration of the mixture is 9wt%, mechanically stirred at 95°C until it becomes a homogeneous system, and a cellulose solution is obtained;

[0064] 2) preparing the first monomer, the specific steps are as follows:

[0065] The cellulose solution was cooled to room temperature, and acryloyl chloride was added dropwise to the cellulose solution in an ice-water bath for reaction, wherein the molar ratio of cellulose to acryloyl chloride was 1:3. After the dropwise addition was completed, the reaction mixture was left at room temperature to react. After 3h the solution was heated to 60°C. After reacting for 3 hours, the product was cooled to room temperature, distilled wa...

Embodiment 3

[0073] A preparation method of a cellulose-based copolymer solid-solid phase change material, comprising the steps of:

[0074] 1) Crush the cotton pulp and dry it in a vacuum oven at 60°C for 12 hours; take a certain amount of dried cotton pulp and dissolve it in lithium chloride / N,N-dimethylformamide (LiCl / DMAc) (wherein, The mass ratio of DMAc to LiCl is 7:1) in the solution, the concentration of cotton pulp is 8wt%, and mechanically stirred at 130° C. until it becomes a homogeneous system to obtain a cellulose solution;

[0075] 2) preparing the first monomer, the specific steps are as follows:

[0076]Cool the cellulose mixture to room temperature and add acryloyl chloride dropwise to the cellulose solution in an ice-water bath to react, wherein the molar ratio of cellulose to acryloyl chloride is 1:3. After the dropwise addition was completed, the reaction mixture was left at room temperature to react. After 3h the solution was heated to 60°C. After reacting for 3 hou...

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Abstract

The invention provides a solid-solid phase change material based on cellulose acrylate and a preparation method of the solid-solid phase change material. The phase change material is prepared throughsteps as follows: cellulose is taken as a matrix and grafted with monomers with functional groups containing double bonds by esterification, modified cellulose ester and alkyl acrylate are subjected to free radical polymerization in a solution, and the solid-solid phase change material is obtained. According to the phase change material, alkyl acrylate is taken as a novel functional substance, andthe novel dendritic cellulose based solid-solid phase change material with high heat enthalpy value is prepared with a free radical polymerization method for the first time. The preparation method ishigh in production efficiency and lower in cost and facilitates industrial implementation, the heat accumulation temperature of the cellulose based solid-solid phase change material prepared with themethod is 30-60 DEG C and is close to the temperature range of a human body, melting temperature is 150-230 DEG C, thermal decomposition temperature is 290-480 DEG C, and therefore, the cellulose based solid-solid phase change material is suitable for processing preparation of human body thermal insulation materials.

Description

technical field [0001] The invention belongs to the technical field of phase change materials, and in particular relates to a cellulose acrylate-based solid-solid phase change material and a preparation method thereof. Background technique [0002] With the continuous increase of greenhouse gas emissions and the consumption of fossil raw materials, human beings use renewable resources to improve energy efficiency. Efficient energy storage devices and systems are an important factor in improving energy utilization and consumption, so thermal energy storage technology has attracted extensive attention due to its key role in sustainable energy infrastructure. Among them, thermophysical and thermochemical storage methods have been intensively studied. In thermophysical storage, phase-change materials (PCMs) can absorb and release thermal energy during phase transitions at a constant temperature, such as melting and crystallization. At present, liquid-solid phase change materia...

Claims

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Application Information

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IPC IPC(8): D01F6/44D01F1/10C08B3/08C08F251/02C08F220/18D04H1/728D04H1/4258C09K5/02
CPCC09K5/02D01F1/10D01F6/44D04H1/4258D04H1/728C08B3/08C08F251/02C08F220/1812C08F220/1818Y02P20/54
Inventor 韩娜钱勇强张兴祥谭林立薄轶文
Owner TIANJIN POLYTECHNIC UNIV
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