Inorganic/organic composite casing layer nanometer phase-change capsule cool-storage fluid and preparation method thereof

Abstract

The invention belongs to the field of a phase change material technology for cool storage, and discloses an inorganic / organic composite casing layer nanometer phase-change capsule cool-storage fluid and a preparation method thereof. The preparation method comprises the following steps: hydrolysis and condensation are carried out for metal alkoxide, modification is carried out with an organosilicon coupling agent, modified metal oxide sol is obtained; a styrene monomer, an acrylic ester comonomer, a chain transferring agent, an initiator and an alkane core material are mixed for forming an oil phase, the oil phase is added into an emulsifier and deionized water for forming a water phase, homogeneous emulsification is carried out, and miniemulsion is obtained; the miniemulsion is heated to 40-80 DEG C, in situ polymerization is carried out for 10-50 minutes, the modified metal oxide sol is added drop by drop, and after a reaction, a composite casing layer nanometer phase change capsule emulsion is obtained; the emulsion is added into an antifreeze, water is added for dilution, and the product is obtained. Metal oxide and organic polymers are compounded into a casing layer; the product has the advantages of high heat conduction performance, high specific heat capacity and good mechanical stability at the same time, and the product can be used as phase-change cool-storage fluid for cool storage air-conditionings.

Description

technical field [0001] The invention belongs to the technical field of phase change cold storage materials, in particular to an inorganic / organic composite shell nano phase change capsule cold storage fluid and a preparation method. Background technique [0002] Air-conditioning phase-change cold storage is an effective means to realize the "peak shifting and valley filling" of the power grid. It can not only improve the cooling efficiency of the air-conditioning system, but also reduce environmental pollution. Traditional phase change cold storage materials, such as ice, eutectic salt, etc., in the cold storage system, the cold storage medium (phase change cold storage material) and the release medium (refrigerant or frozen water) are functionally separated, that is, the storage and transportation of cold energy It is completed by two materials, one material stores cold energy (first heat exchange), and then transfers cold energy to another fluid (second heat exchange). Du...

AI Technical Summary

Problems solved by technology

As for the nanocapsule LFTF in the field of phase change cold storage air conditioning, so far, few mentions have been made.

Since the shell of the nanocapsule is a vinyl polymer, on the one hand, its long-term cold-heat cycle puts forward high requirements on the thermal stability (heat resistance) of the material; on the other hand, its own thermal conductivity is low, if As a cold storage fluid, it is difficult to quickly and effectively transfer cold energy to the base fluid, which greatly limits the heat transfer efficiency of the fluid

[0004] Metal oxides have high thermal conductivity and thermal stability; however, using metal oxides alone as the shell layer is difficult to meet the requirements of long-term and periodic cooling and heating cycles due to its high rigidity and brittle performance.

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