Methyl hexadecanoate-methyl stearate composite phase-change energy-storage material and preparation method thereof

Abstract

The invention discloses a preparation method of a methyl hexadecanoate-methyl stearate composite phase-change energy-storage material. The preparation method of the methyl hexadecanoate-methyl stearate composite phase-change energy-storage material comprises the following steps that methyl hexadecanoate and methyl stearate are added to a reaction container according to the mass ratio of one fourth to four, the mixture is heated in a thermostatic water bath and stirred for 25-35 min, the mixture is then cooled to the indoor temperature, and then the methyl hexadecanoate-methyl stearate composite phase-change energy-storage material is obtained, wherein the temperature of the thermostatic water bath is set to be 50-70 DEG C. According to the preparation method of the methyl hexadecanoate-methyl stearate composite phase-change energy-storage material, the phase change material has the advantages that the phase change latent heat is high, the volume change in the phase change process is small, the surface temperature fluctuation is low, the phase change material is well fused with a building material and low in cost, and the phase change temperature of the phase change material is closest to the indoor and outdoor optimum temperatures, and the advantages of the phase change material are utilized for synthesis of the composite phase-change energy-storage material; and the phase change temperature of the composite phase-change energy-storage material is obviously lower than a single phase change material, the comfortable state that the indoor temperature gradient is lowered to be smaller than 5 DEG C can be achieved, the service efficiency of an air conditioner is improved, and energy is saved.

Description

technical field [0001] The invention relates to the field of phase change materials, in particular to a methyl palmitate-methyl stearate composite phase change energy storage material and a preparation method thereof. Background technique [0002] Phase-change energy storage materials refer to the ability to store and release energy by absorbing heat (cold) in the environment or releasing heat (cold) in the environment during the phase change process. Research hotspot, this technology has important application value for building energy saving. The building energy-saving methods mainly adopted in my country at this stage mainly include external wall thermal insulation system and internal wall thermal insulation system. Among them, external thermal insulation of external wall has a relatively mature construction technology and good thermal insulation effect. Under normal circumstances, the thickness of the wall can be reduced to achieve the effect of increasing the use area, e...

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Problems solved by technology

The phase transition temperature of methyl palmitate is 28°C to 30°C, and that of methyl stearate is 37°C to 41°C, both of which are higher than the temperature range of 20°C to 25°C suitable for building energy saving, which does not meet the requirements of building energy conservation. Basic requirements for energy-saving phase change materials

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