38results about How to "Suppress supercooling" patented technology

The invention discloses a silicon nitride-modified phase-change and energy-storage microcapsule, comprising a shell material and a cladded core material, wherein the shell material comprises the following raw materials in parts by weight: 50-100 parts of high-molecular polymers and 1-20 parts of silicon nitride powder which is evenly dispersed into the high-molecular polymers; the core material comprises 50-100 parts of organic phase-change and energy-storage materials and 1-20 parts of silicon nitride powder which is evenly dispersed into the organic phase-change and energy-storage materials. The invention also provides a preparation method of the phase-change energy-storage microcapsule. The thermal conductivity of the phase-change and energy-storage material is improved, overheat and overcold degrees in the phase-change process are inhibited, and meanwhile, the thermal endurance and the abrasive resistance, the thermal shock resistance, the fatigue resistance and the like also are improved. The silicon nitride-modified phase-change and energy-storage microcapsule is relatively simple in preparation technology, available in raw materials, strong in controllability, and applicable to the industrial large-scale production, an existing industrial processing technology can be fully utilized, and the performance of the phase-change and energy-storage microcapsule is improved.

The invention belongs to the technical field of preparation of phase change energy storage materials, and concretely relates to a phase change material, and a preparation method and a use thereof. The phase change material comprises an energy storage material and a crystallized porous metal organic material. The preparation method of the phase change material comprises the following steps: mixing the energy storage material with the porous metal organic material, carrying out vacuum pumping at 80-200 DEG C until the pressure is 0-0.08 MPa, and carrying out ultrasonic treatment for 20-100 min to obtain the target phase change material. The phase change material prepared in the invention has the advantages of good stability, no supercooling phenomenon, large energy storage density and good heat conduction property, and can improve the photoelectric conversion efficiency by 20% when applied to photoelectric conversion devices.

Provided is a latent-heat storage material containing a supercooling inhibitor which, when contained in an aqueous inorganic-salt solution containing sodium chloride, can separate out as crystals without fail upon cooling to inhibit supercooling and the inclusion of which little lowers the melting point or the quantity of latent heat. The latent-heat storage material contains an aqueous sodium chloride solution and comprises: the aqueous sodium chloride solution having a eutectic concentration; and disodium hydrogen phosphate contained in an amount not less than the saturation concentration at0 DEG C in the aqueous sodium chloride solution having the eutectic concentration. Due to this, the use of the latent-heat storage material containing the supercooling inhibitor, which can separate out as crystals without fail upon cooling to inhibit supercooling and the inclusion of which little lowers the melting point or the quantity of latent heat, makes it possible to keep cool by means of sufficient quantity of latent heat while inhibiting supercooling.

The invention discloses a 'core-shell' type mesoporous silica / organic phase change material composite nano capsule and a preparation method thereof and belongs to the technical field of phase change energy storage materials. The nano capsule consists of a dense silica shell and a mesoporous silica / organic phase change material composite core, is of a long-range order mesoporous structure inside, has an external diameter smaller than 200nm, and is of a typical 'core-shell' structure; the organic phase change material accounts for 35-50wt% by mass of the nano capsule. The preparation method of the nano capsule comprises the following steps: implementing an emulsion template self-assembling method and an emulsion template interfacial polycondencation method, strictly controlling reaction conditions such as the amount of a surfactant, the core-shell raw material proportion and the stirring velocity, and carrying out in-situ formation in the sol-gel process, thereby obtaining the nano capsule. Compared with a conventional phase change microcapsule, the nano capsule disclosed by the invention has rapid thermal response and heat conduction velocities and low supercooling degrees, and high-sensitivity heat temperature adjustment and heat management can be effectively implemented.

The invention provides a composite phase-change thermal storage material. A porous material with high thermal conductivity is used as a supporting framework, and low-melting-point metal or low-melting-point metal with nano-particles is distributed in pores of the porous material, wherein melting point or solidus temperature of the low-melting-point metal is less than or equal to 80 DEG C; and thermal conductivity of the porous material is within 40-400 W / (m.K). The material provided by the invention has high equivalent thermal conductivity and high storage energy density; there is a large contact area between the liquid metal and the porous material; and the material has a wide application temperature range, has good fixability, stable physico-chemical property and good reversibility; and the problem of decreasing heat storage efficiency after multiple times of heat adsorption and release cycles is avoided.

The invention discloses a supercooling phase change-inhibiting alkane microcapsule and preparation and application thereof. The size of the alkane microcapsule is within a range from 0.1Mu m to 100Mu m, the alkane microcapsule consists of shell materials and core materials, the shell materials are melamine resin, the core materials are n-alkane phase change agent and n-alkane nucleating agent, the carbon atom number of the n-alkane phase change agent is twelve to twenty eight, and the carbon atom number of the n-alkane nucleating agent is twenty two to forty. The preparation method for the alkane microcapsule, which is disclosed by the invention, is an in-situ polymerization method, and the preparation process includes core material emulsion preparation, shell material prepolymer preparation and alkane microcapsule preparation. For the same type of alkane microcapsule, the carbon atom number of the nucleating agent is greater than the carbon atom number of the phase change agent, and the nucleating agent and the phase change agent can be formed into gel. The invention has the advantages that: the alkane microcapsule has the characteristics of supercooling phase change inhibition, smooth surface and aggregation resistance, the preparation process for the alkane microcapsule is simple, and the application range is wide.