Heat-storage aerated concrete and preparation method thereof

Abstract

The invention discloses heat-storage aerated concrete and a preparation method thereof. The method comprises the following steps: mixing expanded perlite and a molten phase-change material evenly, carrying out vacuum adsorption in a water-bath environment of 70 DEG C for 1 hour, and cooling the mixture at 20 DEG C after adsorption is ended; evenly spraying a triethanolamine aqueous solution on the surface of the expanded perlite adsorbing the phase-change material; and carrying out ash coating treatment with cement, evenly coating the surface of the expanded perlite with a cement grey layer, spraying water on the surface of the expanded perlite after ash coating treatment, and hardening the cement on the surface of the expanded perlite into a shell to obtain the composite phase-change material. By virtue of the heat storage property of the phase-change material, the heat storage coefficient of the aerated concrete can be effectively improved by compounding the phase-change material with the aerated concrete, so that the heat preservation and heat insulation capabilities of the aerated concrete can be further improved; and the building energy efficiency is improved. Moreover, the triethanolamine aqueous solution is sprayed on the surface of the perlite, so that uniform and complete ash coating can be ensured on the basis that the surface of the expanded perlite adsorbing paraffin has relatively good wettability; and leakage of the phase-change material is effectively prevented.

Description

technical field [0001] The invention relates to the field of building heat preservation, in particular to a heat storage aerated concrete and a preparation method thereof. Background technique [0002] Phase change heat storage material is a substance that can store a certain form of energy under specific conditions and release it under specific conditions, and can realize the conversion of energy in time and space. Due to the concerns of global warming and the high latent heat storage performance of phase change materials that can reduce building energy consumption, the potential use of phase change materials in building materials has been extensively studied. [0003] Air-entrained concrete is a lightweight porous thermal insulation building material, but due to its low heat storage coefficient, its thermal insulation performance has certain limitations. Using the heat storage performance of phase change materials, combining phase change materials with air-entrained concr...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN102503319A discloses a phase-change energy-storage phase-change concrete and its preparation method. A phase-change heat-storage foam concrete is prepared by adding phase-change microcapsules to foam concrete. However, the preparation method of phase-change microcapsules is complicated and difficult Conducive to the popularization and application of phase change materials in building materials

Chinese patent CN104529274A discloses a building material for energy storage and heat preservation, which absorbs paraffin into the voids of expanded perlite, and then directly adds it to cement and stirs it into shape. This patented method does not process the porous building material that absorbs paraffin. Poor formability during slurry mixing, and there is no leakage problem during long-term use

Chinese patent CN102827583A discloses a phase change composite material and its preparation method. The phase change material and expanded perlite are combined by vacuum adsorption, and then the combination of phase change material and expanded perlite is wrapped by polymer emulsion. Although this patent uses polymer emulsion to wrap the combination of phase change material and expanded perlite, the interface bonding of this organic inclusion in cement-based materials will still be loose, which will affect the performance of cement-based materials

[0005] At present, many domestic and foreign scholars have studied the adsorption of phase change materials and porous materials, and used them in cement-based materials to prepare new energy storage building materials, but there are very few studies on the application of phase change materials to aerated concrete.