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Preparation method of polyethylene glycol/silicon-oxygen compound composite phase-change material with heat storage and temperature adjustment

A technology of composite phase change materials and silicon-oxygen compounds, which is applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of low content of phase change functional materials, gas removal, low phase change enthalpy, etc. Low cost and easy availability, long cycle life and low requirements for process conditions

Active Publication Date: 2017-06-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no matter vacuum impregnation method, solution impregnation method or melt impregnation method, it is difficult to obtain a shape-fixed phase change material with a high coating rate, because the above-mentioned method cannot completely remove the gas therein, and there are still voids in the obtained material, resulting in The content of phase change functional materials is not high, and the phase change enthalpy is not high

Method used

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  • Preparation method of polyethylene glycol/silicon-oxygen compound composite phase-change material with heat storage and temperature adjustment
  • Preparation method of polyethylene glycol/silicon-oxygen compound composite phase-change material with heat storage and temperature adjustment

Examples

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Effect test

Embodiment 1

[0027] (1) Take the by-products of inorganic silica gel enterprises (SiO 2 Content about 94%) 3g, fully react with 20mL, 6mol / L NaOH solution to get Na 2 SiO 3 Aqueous solution, aged for 3h.

[0028] (2) Na obtained in (1) 2 SiO 3 Acetic acid with a concentration of 60% by mass is added dropwise to the aqueous solution until the pH value reaches 6, stirred at a slow speed, and aged for 2 hours to obtain flocculent orthosilicic acid.

[0029] (3) Aging the ortho silicic acid obtained in (2), centrifuging, washing, and suction filtration under reduced pressure to obtain ortho silicic acid gel.

[0030] (4) Add the orthosilicic acid gel obtained in (3) to 12 g of polyethylene glycol (PEG1500) with a molecular weight of 1500, then add 3 g of water, and stir at a constant temperature of 40 ° C for 3 h.

[0031] (5) The mixture obtained in (4) was placed in a thermostat at 70° C. and dried to a constant weight.

[0032] PEG1500 / SiO of the present invention 2 (OH) Composite ph...

Embodiment 2

[0034](1) Take the by-products of inorganic silica gel enterprises (SiO 2 Content about 94%) 3g, fully react with 20mL, 6mol / L KOH solution to get K 2 SiO 3 Aqueous solution, aged for 3h.

[0035] (2) K obtained in (1) 2 SiO 3 Add 50% acetic acid dropwise in the aqueous solution until the pH value reaches 6, stir slowly, and age for 3 hours to obtain flocculent orthosilicic acid.

[0036] (3) The ortho silicic acid obtained in (2) is centrifuged, washed, and filtered under reduced pressure to obtain ortho silicic acid gel.

[0037] (4) Add the orthosilicic acid obtained in (3) into 7g of PEG1500, then add 2g of water, and stir at a constant temperature of 40°C for 3h.

[0038] (5) The mixture obtained in (4) was placed in a thermostat at 70° C. and dried to a constant weight.

[0039] PEG1500 / SiO of the present invention 2 (OH) Composite phase change material is white block, easy to grind into powder, wherein PEG1500 mass percentage accounts for about 74%, its different...

Embodiment 3

[0041] (1) Take 15g of oil shale ash, soak it with sulfuric acid with a concentration of 60% by mass for 1 day, wash and filter it, and take its filter cake.

[0042] (2) get the filter cake gained in (1) (SiO 2 Content about 96%) 6g, fully react with 35mL, 6mol / L NaOH solution to get Na 2 SiO 3 Aqueous solution, aged for 3h.

[0043] (3) Na obtained in (2) 2 SiO 3 Acetic acid with a concentration of 40% by mass is added dropwise to the aqueous solution until the pH value reaches 5, stirred at a slow speed, and aged for 2 hours to obtain flocculent orthosilicic acid.

[0044] (4) After aging the ortho silicic acid obtained in (3), centrifugal separation, washing, and suction filtration under reduced pressure to obtain ortho silicic acid gel.

[0045] (5) Add the orthosilicic acid obtained in (4) into 23g of PEG10000, then add 7g of water, and stir at a constant temperature of 40°C for 3h.

[0046] (6) Put the mixture obtained in (5) into a thermostat at 70° C. and dry to...

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Abstract

The invention discloses a preparation method of a polyethylene glycol / silicon-oxygen compound composite phase-change material constructed by means of a two-step sol-gel process. The method comprises the following steps: by-products of inorganic silica gel production or oil shale ash of shale oil / gas production or natural sand are used as raw materials, alkali and acid treatment are separately carried out, in order to synthesize orthosilicic acid, centrifugation and washing, pumping filtration with reduced pressure are carried out in order to obtain orthosilicic acid gel; orthosilicic acid gel is heated and stirred in an aqueous solution of polyethylene glycol, dispergation is generated for the orthosilicic acid gel, heat treatment is carried out for the mixture, and the polyethylene glycol / silicon-oxygen compound composite phase-change material is prepared. In the second step, in the process of gel dissolution and dispergation, polyethylene glycol of different mass and different molecular weights are separately added, in order to obtain the composite phase-change material with different phase-transition temperatures and different phase-transition enthalpy values.

Description

technical field [0001] The invention belongs to a preparation method of a polyethylene glycol / silicon oxide compound composite material that can be used as a heat storage and temperature adjustment phase change material, in particular to a two-step sol-gel process to synthesize a network-like silicon oxide compound-coated polyethylene glycol Preparation method of organic / inorganic composite material of alcohol. Background technique [0002] Phase change materials with heat storage and temperature adjustment functions are increasingly known and recognized by people, and their application range is also becoming wider and wider. However, due to the leakage, fluidity and environmental compatibility of liquid substances, most materials with the function of phase change heat storage and temperature regulation cannot be used directly, so the modification method of phase change materials is still an important way to promote their practical applications. key technologies. In order ...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 史全李彦山
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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