Paraffin-attapulgite composite phase-change material and preparation method thereof

Abstract

The invention discloses a preparation method of a paraffin-attapulgite composite phase-change material. The method comprises the following steps: rinsing, acidifying, and carrying out organic modified treatment on attapulgite; mixing the treated attapulgite with an inorganic material evenly; and finally adding fused phase-change paraffin, so as to obtain the paraffin-attapulgite composite phase-change material through an impregnation method. The composite phase-change material prepared by the method has high heat-conducting coefficient and phase-change enthalpy value; the preparation method is simple, economical and environmental friendly; the problem of low phase-change enthalpy value caused by low paraffin adsorbing capacity of a paraffin-based phase-change material at present is solved; in addition, the phase-change material with a controllable phase-change temperature is obtained by blending the mass ratio of phase-change paraffin with different brands; application of the paraffin-based composite phase-change material in the field of energy-saving and energy-storage materials is further expanded; and the preparation method has good economic benefits and a broad application prospect.

Description

Technical field: [0001] The invention relates to the field of energy-saving energy storage materials, in particular to a paraffin-attapulgite composite phase change material and a preparation method thereof. Background technique: [0002] With the advancement of the industrialization process of developed countries in the 20th century, the continuous economic development has led to a large consumption of energy resources, and the human demand for energy has become increasingly urgent. Since the 1970s, the energy crisis and environmental pollution caused by the massive consumption of traditional energy have made people gradually pay attention to improving energy utilization efficiency and developing new energy sources with high efficiency, energy saving and renewable energy, such as vigorously Develop new energy sources such as wind energy, solar energy, and geothermal energy. The development and application of heat storage technology has become one of the important means to ...

AI Technical Summary

Problems solved by technology

However, the thermal conductivity of paraffin-based organic phase-change energy storage materials is low, and the phase-change materials are easy to leak from the matrix, which also limits its application range, so in practice, it must be considered to enhance its packaging and heat transfer

Chinese patent application 103694963A discloses a method of using porous and graphitized carbon microspheres as a carrier to improve the thermal conductivity of paraffin composite phase change materials. The paraffin composite phase change material obtained by this method has a higher thermal conductivity, but the carrier is not The low adsorption amount of paraffin leads to the small phase change enthalpy of the phase change material, and the preparation method is complicated and cumbersome, which needs further improvement

Chinese patent application 102127395 A uses the melting method to prepare microcapsule phase change materials, which solves the technical problems of low paraffin wax incorporation, poor energy storage performance, easy leakage, and poor stability. Problems such as low thermal conductivity of materials

Chinese patent application 102531506 A obtains a composite phase change material by stirring and mixing a porous matrix and a paraffin phase change material. This method overcomes the shortcomings of macroscopic container packaging, microscopic capsule packaging, and microscopic cross-linking packaging, which have complex processes and expensive materials. , but the low thermal conductivity still limits the wide application of this material

Chinese patent application 101348626A provides a method for preparing an organic-inorganic composite phase-change material for temperature-regulating coatings. In this patent, composite paraffin or octadecane such as expanded perlite and attapulgite is used to obtain composite materials by vacuum adsorption and impregnation. For phase change materials, since porous minerals such as attapulgite have certain hydrophilicity, the adsorption capacity of unmodified porous minerals for phase change materials such as paraffin is low, resulting in a relatively low phase change enthalpy of 127.2J / g

Chinese patent application 101429423A discloses a preparation method of nanocomposite phase change materials. By organically modifying layered silicates such as montmorillonite and kaolin, phase change materials such as paraffin are obtained through aqueous solution intercalation, which solves the problem of organic and inorganic phase change materials. Compatibility issues between materials, but the content of organic phase change materials fixed by adsorption through intercalation is not ideal, resulting in a lower phase change enthalpy value of 157.2J / g, and the resulting material has a lower thermal conductivity

Chinese patent application 102212339A provides a ternary composite preparation method of expanded graphite / organized montmorillonite / paraffin nano-shaped phase change material. The obtained material has high thermal conductivity and stable phase change, but the phase change enthalpy is also relatively low , up to 159.06J / g, the material preparation method mentioned in this patent uses a solvent, which not only increases the cost, but also makes the preparation method complicated, and also limits its wide application in industry and life

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