Agricultural low-temperature phase change heat storage material and preparation method thereof

Abstract

The invention discloses agricultural low-temperature phase change heat storage material and a preparation method thereof. The preparation method specifically includes: mixing crystalized disodium hydrogen phosphate with water, and dissolving under 50-80 DEG C to obtain the aqueous solution of disodium hydrogen phosphate; adding potassium salt and ammonium salt, and dissolving under 30-80 DEG C to obtain mixed liquid; regulating the temperature of the mixed liquid to be 5-30 DEG C; screening the mixed liquid, and drying the screened substances in a blowing drying oven under 20-45 DEG C to obtain the agricultural low-temperature phase change heat storage material. The agricultural low-temperature phase change heat storage material prepared by the method has the advantages that the phase change temperature of the agricultural low-temperature phase change heat storage material is 15.1-34 DEG C, the phase change latent heat range of the agricultural low-temperature phase change heat storage material is 160-200J / g, the condensate depression of the agricultural low-temperature phase change heat storage material is 0.5-2 DEG C, and the agricultural low-temperature phase change heat storage material is high in heat storage and heat discharge efficiency; in addition, the agricultural low-temperature phase change heat storage material is simple in preparation method and applicable to cultivation in facilities such as an agricultural sunlight greenhouse, a multi-span greenhouse and a plastic single greenhouse.

Description

technical field [0001] The invention relates to an agricultural phase-change thermal storage material, in particular to an agricultural low-temperature phase-change thermal storage material with disodium hydrogen phosphate crystalline compound as the main thermal storage phase-change material, adding potassium salt, ammonium salt and water, and a preparation method thereof . Background technique [0002] Greenhouse is an important production method in modern facility agriculture. However, due to the extremely cold winter climate, it is difficult for the existing greenhouses to maintain the growth of winter crops. Insufficient temperature in the greenhouse will cause frost damage to crops and reduce crop yield and agricultural product quality. Therefore, it has become a cold season to seek green economic greenhouse warming measures Key issues in greenhouse production. Solar energy is the most ideal energy source in the future, but due to the influence of seasons and diurnal...

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Problems solved by technology

Chinese patent application CN201210003218.3 discloses a composite phase change heat storage material, which is composed of five types of raw materials: heat storage agent, phase change temperature regulator, crystallization nucleating agent, suspension thickener, and solvent. The prepared Na 2 SO 4 10H 2 The phase change temperature of O composite phase change heat storage material is 24-32°C, the latent heat of phase change is less than 170J / g, and the degree of supercooling is 3-5°C. The phase change temperature is relatively high, the heat storage is less, and the degree of supercooling is high; China Patent application CN200610032662.2 discloses a polyethylene glycol / silica composite shape-setting phase change material. The phase transition temperature of the prepared polyethylene glycol phase composite phase change material is about 67°C, and the latent heat of phase change is about 140J / g. The phase change temperature is high, and the latent heat of phase change is low; Chinese patent application CN201410803518.9 discloses a phase change heat storage material for medium temperature, which is composed of adipic acid, rare earth oxide, graphene and a binder. The heat storage and heat release cycle of the thermal material does not exceed 500 times, and the stability is poor

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