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The preparation method of a cement base fixed phase change material

A technology of shape-setting phase-change materials and phase-change materials, which is applied in the field of preparation of cement-based shape-setting phase-change materials, can solve the problems of low encapsulation rate of phase-change materials, easy residual phase-change materials, and easily broken shell materials, etc., to achieve Excellent physical properties, low cost, and high encapsulation efficiency

Active Publication Date: 2020-11-06
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common encapsulation methods, such as microcapsule phase change materials, have disadvantages such as low physical strength and easily broken shell materials, or composite shape-fixed phase change materials prepared by physical adsorption, but this method also has low encapsulation efficiency of phase change materials. High, the surface is prone to residual phase change materials and other disadvantages

Method used

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  • The preparation method of a cement base fixed phase change material
  • The preparation method of a cement base fixed phase change material
  • The preparation method of a cement base fixed phase change material

Examples

Experimental program
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Embodiment 1

[0031] The raw material composition of the cement-based shape-setting phase-change material prepared in this example is as follows: the cement used is ordinary Portland cement, the phase-change material used is polyethylene glycol with a relative molecular mass of 2000, the mineral admixture used is silica fume, and the used The quick-setting agent is the Red Star Type I quick-setting agent belonging to the alumina clinker-carbonate system, the thickener used is polyacrylamide belonging to the propylene system, and the concentration of the polyethylene glycol aqueous solution is 70%. Concrete preparation steps are as follows:

[0032] S1. Add 70g polyethylene glycol 2000 into 30g water and stir at normal temperature to prepare 100g concentration of 70% polyethylene glycol aqueous solution;

[0033] S2. Weigh 100g of cement, 10g of silica fume, 5g of accelerator and 0.8g of thickener and put them into the mixing pot for dry mixing for 1 to 2 minutes;

[0034] S3. Slowly pour t...

Embodiment 2

[0041] The raw materials of the cement-based shape-setting phase-change material prepared in this example are as follows: the cement used is sulphoaluminate cement, the phase-change material used is polyethylene glycol with a relative molecular mass of 4000, and the mineral admixture used is ultra-fine pulverized coal Ash, the quick-setting agent used is ART-SL12 non-alkali liquid quick-setting agent, the thickener used is cellulose ether belonging to the cellulose system, and the concentration of polyethylene glycol aqueous solution is 50%. Concrete preparation steps are as follows:

[0042] S1. Pour 50g polyethylene glycol 4000 into 50g water and stir at normal temperature to prepare 100g concentration of 50% polyethylene glycol aqueous solution;

[0043] S2. Weigh 100g of cement, 6g of superfine fly ash and 0.2g of thickener and put them into the mixing pot for dry mixing for 1 to 2 minutes;

[0044] S3. Slowly add the prepared 100g polyethylene glycol aqueous solution and...

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Abstract

The invention discloses a preparation method of a cement-based shape-stabilized phase change material, belonging to the technical field of preparation of phase-change materials. According to the invention, the cementitious characteristic of cement and the water solubility of a phase-change material polyethylene glycol are utilized; the cement is blended with an aqueous polyethylene glycol solutionand undergoes a hydration reaction with water in the solution, and the polyethylene glycol is gradually crystallized and separated out due to supersaturation and is wrapped by a generated hydration product; and when the cement is finally hydrated, the polyethylene glycol is firmly packaged by the hydration product. The cement-based shape-stabilized phase change material disclosed by the inventionhas the advantages of high phase change material encapsulation rate, good stability, simple preparation process, low cost and the like, and can be widely applied to the fields of heat energy storage,building energy conservation and the like. The hydration of the cement and the crystallization and precipitation of the polyethylene glycol are carried out at the same time, so the hydration productand a polyethylene glycol chain segment are intertwined; and thus, a stable packaging system is formed, and the prepared cement-based shape-stabilized phase change material is prevented from leaking when phase change occurs.

Description

technical field [0001] The invention belongs to the technical field of preparation of phase change materials, and in particular relates to a preparation method of cement-based shape-fixed phase change materials, which is applied in the fields of thermal energy storage, building energy saving and the like. Background technique [0002] In recent years, with the intensification of greenhouse gas emissions and the shortage of fossil energy supply, how to improve energy efficiency has gradually become the focus of attention. Thermal energy storage technology can recover waste heat and alleviate the contradiction between supply and demand of thermal energy. It is an important environmental protection technology to improve energy utilization efficiency. Thermal energy storage technologies include latent heat storage, sensible heat storage and chemical heat storage. Among them, the latent heat storage technology developed based on the characteristics of phase change materials that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02C04B28/06C09K5/06
CPCC04B28/02C04B28/06C09K5/063C04B24/32C04B18/146C04B2103/12C04B2103/44C04B18/08
Inventor 杜银飞刘谱晟魏唐中马聪
Owner CENT SOUTH UNIV
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