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Preparation method of carbonized wood-based composite phase- change energy storage material

A technology of composite phase change and energy storage materials, applied in the field of preparation of high carbonized wood-based composite phase change energy storage materials, can solve the problems of single function, poor stability, low thermal conductivity, etc., and achieve increased specific surface area and high temperature stability. Good properties and high latent heat of phase transition

Active Publication Date: 2021-02-23
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing carbonized wood-based composite phase change energy storage materials for the disadvantages of poor stability, low thermal conductivity and single function of the existing composite phase change energy storage materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036](1) Put 20 × 20 × 8 mm Burst Wood in the deionized water at 80 ° C for 2 h, then trigger the empty as the wood block, continue to cook 1H;

[0037](2) Thoroughly cooked wooden block transfer 10% NaClo in pH 42In the solution, 2.H is cooked at 80 ° C, and the transfer of deionized water is repeated and rinsed into the wood block, and the detachment is given after cryogenic drying;

[0038](3) Ethyl silicate and methyltrimethoxysilane, anhydrous ethanol, deionized water N, N-dimethylformamide are added to the beaker than 0.8: 0.2: 6: 4: 0.5. The magnetic stirring is mixed and mixed, and 0.1 mol / L hydrochloric acid is added dropwise to 2 for hydrolysis, hydrolysis 3 h;

[0039](4) 0.25 mol / L ammonia water to a pH of 6 and stir even after uniform, immersed the block-shaped 去 木 Bar Par pine into the solution, vacuum immersion for 40 min, and then placed 12h to enhance the skeleton structure;

[0040](5) TEOS, MTMS and anhydrous ethanol are mixed according to the amount of substance ratio o...

Embodiment 2

[0050](1) Put the 20×20×8mm Balr fir wood block into deionized water at 80°C and cook for 2 hours, then vacuum when the wood block sinks to the bottom, and continue cooking for 1 hour;

[0051](2) After thoroughly boiled the wood block is transferred to 10% NaClO with pH 42In the solution, cook at 80°C for 2h. Transfer to deionized water to soak and rinse repeatedly until the wood block turns white, and freeze-dried to obtain the delignified cedar wood block;

[0052](3) Add ethyl orthosilicate, methyltrimethoxysilane, absolute ethanol, and deionized water N,N-dimethylformamide to the beaker at a material ratio of 0.8:0.2:6:4:0.5 , Magnetic stirring and mixing uniformly, add 0.1mol / L hydrochloric acid dropwise to pH 3 for hydrolysis, and hydrolysis for 3h;

[0053](4) Add 0.25 mol / L ammonia water to pH 7 and stir evenly, then immerse the massive delignified Chinese fir in the solution, vacuum immerse for 40 minutes, take it out, and leave it for 12 hours to strengthen the skeleton structure;...

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Abstract

The invention provides a preparation method of a carbonized wood-based composite phase-change energy storage material, which comprises the following steps: using a balsa woodblock from which part of lignin is removed as a matrix and SiO2 aerogel as a reinforcing phase to support a fiber matrix, and impregnating a phase-change material into the carbonized wood- SiO2 aerogel matrix by a vacuum impregnation method. According to the method, the pore channel structure of the balsa wood is reinforced by using the SiO2 aerogel, so that the volume shrinkage of the balsa wood fiber matrix in the carbonization process is reduced, and the original multi-stage pore structure of the wood is maintained; and the SiO2 aerogel further enhances the specific surface area of the packaging substrate material while reinforcing the pore structure of the carbonized wood, the SiO2 aerogel improves the accommodating capacity of the whole substrate to the phase-change material by means of the unique pore diameter and pore structure, and the packaging rate exceeds 90%. The problem of leakage of the phase-change energy storage material in use is solved, the heat storage and release efficiency of the packaged phase-change energy storage material is improved, and a new direction is developed for research of a frame matrix of the phase-change energy storage material.

Description

Technical field[0001]The present invention relates to a preparation method of high carbonedtromer composite phase change energy storage material, which is a technical field of preparation of composite phase change heat storage materials.Background technique[0002]The carbide-based composite phase change energy storage material refers to a carbonized wood obtained by macro wood entity as a matrix material, using a three-dimensional network pore structure that is unique to wood, by capillary tension, Van Dew Huawhuata, etc. A new biomass compound formed by forming the phase change energy storage material.[0003]Carbicide-based composite phase change energy storage materials have broad application prospects in the field of building energy conservation. At present, due to small volume shrinkage of wood in the carbonization process, the substrate volume caused by a small amount of carbide frames caused by campaign, and the load capacity of phase change energy is too low, which constrained ...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063Y02P20/10
Inventor 陈瑶何林韩任瑞清王明杰高建民
Owner BEIJING FORESTRY UNIVERSITY
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