Phase-change composite aerogel and preparation method thereof

Abstract

The invention provides a phase-change composite aerogel and a preparation method thereof. The preparation method comprises the steps of: mixing a silicon source 1 and a silicon source 2 and then dissolving the mixture in an aqueous solution of ethyl alcohol, performing mechanical stirring at room temperature till uniform mixing, then adding an acid catalyst into dispersion liquid, and adjusting the pH of the dispersion liquid to be 1-3, thus obtaining a silicon dioxide sol; adding a basic catalyst into the silicon dioxide sol prepared in the step 1, adjusting the pH value of the silicon dioxide sol to 7-10, adding phase-change microcapsules and fibers into the sol, performing mechanical stirring at room temperature until the materials are uniformly mixed, pouring the mixed sol into a mold,conducting standing to obtain wet gel, removing the wet gel from the mold, performing soaking in an anhydrous ethanol solution, performing aging for 10-40h, and finally conducting drying at 25-65DEGC for 20-30h to obtain the phase-change composite aerogel. The phase-change microcapsules are loaded in the silicon dioxide aerogel, and the nanofibers with good heat-conducting property are added toenhance the heat-conducting property of the aerogel skeleton, so that the phase-change microcapsules and the silicon dioxide aerogel are optimized.

Description

technical field [0001] The invention relates to the field of green energy-saving building materials, and more specifically relates to a phase-change composite airgel and a preparation method thereof. Background technique [0002] Phase change materials are thermal functional materials that can absorb or release latent heat. Different from thermal insulation wall materials, phase change materials are not limited to thermal insulation in buildings. It can produce several times the heat insulation and heat preservation effect of the same amount of traditional heat preservation materials, and at the same time reduce the frequency of indoor air temperature fluctuations through the cycle of high temperature heat absorption and low temperature heat release, and keep the temperature in a long period of time with the required temperature Close to, increase the comfort of the human body, and make the building energy-saving effect more remarkable. However, the temperature regulation p...

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Problems solved by technology

Therefore, through the optimization of different silicon sources, the phase change and composite silicon sources are used as raw materials, and the silica airgel phase change composite material is prepared by the atmospheric pressure drying method, which shows heat insulation and heat storage in different temperature zones and is suitable for buildings. At present, the research is still blank and needs to be further explored and solved.

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