52results about How to "Good phase change performance" patented technology

The invention discloses a preparation method for vanadium dioxide and doped powder thereof. The method comprises the following steps: 1, weighing vanadium pentoxide, hydrogen peroxide and distilled water, preparing the materials into a V<5+>-containing complex aqueous solution; 2, adding a reducing agent, a surfactant and a dopant to the complex aqueous solution, and stirring to form a clear solution; 3, transferring the resulting solution from the step 2 to a hydrothermal reaction kettle, and carrying out a reaction for 1-168 hours at a temperature of 140-220 DEG C to obtain the doped powderof the VO2(B); 4, placing the resulting doped powder of the VO2(B) from the step 3 in high pure argon atmosphere or nitrogen atmosphere, and annealing for 10-720 minutes at the temperature of 400-700DEG C to obtain the doped powder of the VO2(M). The method of the present invention has characteristics of low cost, simple process and easy control, and is suitable for the large-scale industrial production. With the method of the present invention, the doping of the VO2 powder material can be realized, and the doped atoms can be uniformly dispersed in the VO2.

The invention provides a method for preparing polyurea-melamin resin double-wall material cetane microcapsule, which comprises: first, toluene-2, 4- vulcabond and quadrol are adopted to synthesize inner layer shell material of the cetane microcapsule by an interfacial polymerization method, and then melamin resin performed polymer is adopted to synthesize outer layer shell material of the cetane microcapsule by an in-situ polymerization method, so that the polyurea-melamin resin double-wall material cetane microcapsule can be prepared. More particularly, the method comprises: hexadecane and the toluene-2, 4- vulcabond are fully mixed together and then added into the mixture of de-ionized water, sodium dodecyl sulfate and polyethylene glycol nonylphenyl ether to be emulsified to obtain cetane emulsified liquid; then, the mixed quadrol solution is dripped into the cetane emulsified liquid to react to obtain polyurea monolayer shell material microcapsule; finally, the polyurea monolayer shell material microcapsule reacts with the melamin resin performed polymer to obtain the polyurea-melamin resin double-wall material cetane microcapsule. The prepared microcapsule has good compactness, high strength and core content and excellent particle size distribution.

The invention discloses a multilayer nanometer composite phase-transition thin film material and a preparation method and application thereof. The material is formed by arranging Sn2Se3 film layers and Sb film layers alternatively, one Sn2Se3 film layer and one Sb film layer serve as an alternative period, and the Sn2Se3 layer in the latter alternative period is deposited on the Sb layer in the former alternative period. A general formula of the film structure of the film material is [Sn2Se3(a)/Sb(b)]x, a represents the thickness of the single Sn2Se3 film layer, b represents the thickness of the single Sb film layer, a is greater than or equivalent to 1nm and lower than or equivalent to 50nm, b is greater than or equivalent to 1nm and lower than or equivalent to 50nm, x represents the number of alternative periods or layers of the Sn2Se3 film layers and Sb film layers, and x is a positive integer. The phase-transition thin film material uses Sb as a crystallization induction layer to accelerate phase transition of the phase-transition material, and advantages of low melting point and high thermal stability of Sn2Se3 are used; and the clamping effect of multiple interfaces in the multilayer nanometer composite structure is used to reduce the size of crystal grains, and further to shorten the crystallization time, inhibit crystallization, improve the thermal stability and accelerate phase transition.

The invention discloses a phase change microcapsule temperature self-adjusting GRC dry-mixed mortar surface layer material. The surface of a phase change microcapsule is coated with a layer of a cement material to make the phase change microcapsule have a hard shell in order to guarantee the integrity of the phase change microcapsule in the stirring processing process, and carbon fibers are added in order to improve the heat conduction performance of the outer wall of the phase change microcapsule. The phase change microcapsule dry-mixed mortar material produced in the invention can be applied to make the surface layer of glass fiber concrete (GRC), and the GRC produced in the invention has an excellent temperature self-adjusting function.

The invention discloses decanoic acid microcapsules and a preparation method thereof. The method comprises the following steps: 1, mixing urea with a formaldehyde solution, adjusting the pH value of asystem to 8-9, and adding melamine in batches when the solution is clear so as to obtain a prepolymer solution; 2, adding decanoic acid and an emulsifying agent into deionized water to obtain a decanoic acid emulsion; 3, pouring the prepolymer solution obtained in the first step into the decanoic acid emulsion obtained in the second step, adjusting the pH value of the reaction system to 2-3, andcarrying out a thermostatic reaction for 0.5-1h at 50-80 DEG C, wherein the stirring speed is 600-1000 rpm; 4, heating up to 70-80 DEG C, adding 0.44-0.5 part by mass of a curing agent into the mixture obtained in the third step, and carrying out a thermostatic reaction for 1-2h, wherein the stirring speed is 600-1000 rpm; 5, filtering, washing, drying and screening the product obtained in the fourth step to obtain the decanoic acid microcapsules. The decanoic acid microcapsules obtained by method is low in cost, simple in operation, high in repeatability and lower in requirements for equipment and raw materials, thus being suitable for industrial production.

The invention provides a silica gel composition. The silica gel composition comprises a silica gel body consisting of components A and B in a mass ratio of 1 to 5, wherein the component A comprises, by mass, 34-83% of dimethyl polysiloxane, 12-65% of polymethylhydrosiloxane and 1-5% of catalysts; the component B is prepared from, by mass, 34-83% of dimethyl polysiloxane, 12-65% of polymethylhydrosiloxane and 1-5% of cross-linking agent; the silica gel composition further contains, based on the total mass of the silica gel body, 0.4-1% of fumed silica, 3.3-4% of prefoamed polymer microspheres and 20-30% of phase change paraffin or 40-50% of solid-state phase change microcapsules; wherein, the prefoamed polymer microspheres are prefoamed polystyrene microspheres, and shells of the prefoamed polystyrene microspheres are made of polystyrene. The silica gel composition is low in specific gravity and weight, has high thixotropy and a good phase change function and is particularly suitable for preparing silica gel prosthesis products. The invention further provides a preparation method of the silica gel composition. According to the preparation method, steps are few, the process is short, operation is easy and convenient, and preparation cost is low.

The invention discloses a Sb2Tex-SiO2 nano composite phase change material used on a phase change memory. The material is formed by compositing a phase change material Sb2Tex with SiO2 and has a chemical formula of (Sb2Tex)y(SiO2)1-y, wherein x is larger than or equal to 0.5 but smaller than or equal to 3 and y is larger than or equal to 0.2 but smaller than 1. The Sb2Tex-SiO2 nano composite phase change material has the advantages that through doping the SiO2 into the phase change material, the phase change material with a reversible phase change ability is isolated into areas with nanoscales by the amorphous state SiO2, and a composite structure is formed, so the resistivity and the crystallization temperature of the phase change material are increased and the heat conductivity of the phase change material is reduced. Due to the increase of the crystalline state resistance of the phase material, a Reset current of the phase change memory device can be reduced, and thereby the barrier that the Reset current of the phase change is overlarge is overcome; due to the rising of the crystallization temperature, the stability of the Sb2Tex-SiO2 phase material device can be improved; dueto the decline of the melting temperature, the power consumption of the Sb2Tex-SiO2 phase material device is effectively reduced; and due to the reduction of the heat conductivity, the utilization rate of energy can be improved.

The invention relates to a composite phase-change energy storage material and a preparation method thereof. The composite phase-change energy storage material is composed of the following components in percentage by mass: 80-95% of calcium chloride hexahydrate, 1.5-15% of phase separation inhibitor and 0-5% of nucleator. The preparation method of the composite phase-change energy storage material comprises the following steps: weighing equal mass of anhydrous calcium chloride and water, and stirring until the anhydrous calcium chloride is completely dissolved, thereby obtaining a first solution; adding the nucleator into the first solution, and stirring to obtain a second solution; and adding the phase separation inhibitor into the second solution, and stirring to obtain the liquid composite phase-change energy storage material. By using the calcium chloride hexahydrate as the phase-change material, the energy storage material has low degree of supercooling, can still keep the phase change complete after repeated circulations, has high energy storage rate, and is more suitable for practical application.

The invention discloses a preparation method of synthesizing a porous carbon-based shaped composite phase-change material capable of being used for heat storage through high-temperature calcination and vacuum impregnation. According to the method, sucrose and sodium bicarbonate are used as raw materials, a porous carbon supporting carrier is prepared through a high-temperature calcination method,then an organic phase-change material is added, the phase-change material is loaded into porous carbon through a vacuum heating impregnation method, and finally the porous carbon-based shaped composite phase-change material is prepared, wherein in the preparation process of the porous carbon carrier, holes of different structures can be prepared by changing the ratio of the sucrose to the sodium bicarbonate, and then shaped composite phase-change materials with different loads are obtained after vacuum impregnation. According to the composite phase-change material synthesized through the method, the porous carbon and the phase-change material are combined through a physical relation, so that the stability is good, and the material can be used for heat storage and waste heat recovery of industrial equipment, solar photo-thermal conversion and other aspects.

The invention discloses a method of preparing a solid-solid phase change material through grafting copolymerization and belongs to the technical field of functional materials. The method comprises thesteps of: 1) pretreatment of raw materials; 2) complete reaction; 3) post-treatment of a crude product. The method preferably including the steps of: treating the surface of porous nano-powder with acid to graft carboxyl groups on the surface of porous nano-powder; performing esterification reaction to the carboxyl groups with hydroxyl groups on a phase-change material, PEG, so as to graft a polyethylene glycol chain terminal onto the framework macromolecules, which have high melting point, high strength and stable structure. Due to the high melting point of the framework macromolecules, macroscopic flowing of the polyethylene glycol is limited, so that solid stage during phase change is guaranteed. The material is free of problems such as separation out, leakage and the like during application.

The invention discloses a Sb2Tey-Si3N4 composite phase change material for a phase change memory and a preparation method thereof. The material is a mixture containing four elements, namely antimony, tellurium, nitrogen and silicon; a Sb2Tey (y is more than 1 and less than 3) phase change material with reversible phase change capability is isolated by amorphous Si3N4 to form a nano-scale region, then a composite structure is formed, and the chemical formula is (Sb2Tey)x(Si3N4)100-x, wherein y is more than 1 and less than 3, and x is more than 60 and less than 100. By regulating the content of Si3N4 in the Sb2Tey-Si3N4 composite phase change material, different crystallization temperatures, melting points and crystallization activation energy can be obtained. Compared with a traditional Sb2Te3 material, the (Sb2Tey)x(Si3N4)100-x has higher crystallization temperature, better thermal stability and data retention and lower melting point; and furthermore, grain size after crystallization is small and energy consumption is low.

The invention discloses a phase-change energy storage device. The phase-change energy storage device comprises a heat conduction piston cavity, a phase-change unit, a heat conduction piston, a limiting ring, a first spring, a heat conduction cap and a heat sink; the piston cavity and the heat sink are oppositely arranged on the front surface and the rear surface, the heat sink is arranged in front of the piston cavity, the front end of the piston cavity is open, and the rear end of the piston cavity is sealed; the piston is in sliding fit in the piston cavity, and the piston is in dynamic sealing with the inner wall of the piston cavity; the phase-change unit is filled in a cavity defined by the end part of the rear end of the piston and the piston cavity, the limiting ring is fixedly connected with the inner wall of the front end of the piston cavity, and the first spring is arranged between the limiting ring and the piston; and the two ends of the first spring are respectively abutted against the limiting ring and the piston, the heat conduction cap is connected with the front end of the piston, the front end of the heat conduction cap penetrates out of the piston cavity, and the heat sink is arranged in front of the heat conduction cap. The phase-change energy storage device can dissipate heat generated by high-power equipment on the basis of keeping a small size, the problem of thermal control of the high-power equipment on a satellite is solved, and normal operation of the equipment is guaranteed.

The invention discloses a preparation method for non-stoichiometric ratio type nanometer VO2-x powder for regulating and controlling phase transition temperature. A target product is obtained through carrying out hydrothermal reaction and annealing treatment on a precursor made of oxalic acid, de-ionized water and vanadium source, the stoichiometric ratio of the product is controllable (x=0-0.05), the phase change temperature can be regulated in the range of Tc=63.0-53.5 degrees centigrade, and the material is more excellent in phase change performance and better for manufacturing a thermochromic smart window, a field effect transistor and the like. The preparation method for the non-stoichiometric ratio type nanometer VO2-x powder for regulating and controlling the phase transition temperature is short in production period, simple in technique, moderate in reaction condition, environmental friendly, low in cost and suitable for large-scale production; the prepared powder can be prepared into a piece of large VO2-x film with adjustable phase change temperature through combining with a powder film forming technology; the preparation method is good for breaking through the application bottleneck of a vanadium dioxide smart window.

The invention discloses a technology of high-strength dual-phase steel sheet welded by high-speed laser wire filling welding. The main technological parameters of welding are as follows that a fiber Nd: YAG laser is used for filling and butt welding; a welding seam prefabricated butt joint gap is 0.2-0.4mm; a focal length of a collecting lens is 15 cm; a defocusing distance is +3-3mm; a laser power is controlled to be 1. 8-6 kW the welding speed is 24-60 mm/s; the diameter of a welding wire ranges from 0.6-1.0 mm; and a wire feeding speed is 20-240 mm/s. The welding seam welding area is quite narrow, and is less than 0.65mm, a residual height is very small; the weld joint area is a thick martensite structure; a welding heat affected zone takes fine martensite tissue as main body and contains a small amount of ferrite. The hardness of a welding joint is in the range of 350-450 HV/0, and the tensile strength of the welding joint is close to or even more than that of the base material;due to the effects of rapid cooling martensite strengthening and alloy strengthening, the hardness and strength of the welding joint are greatly improved.

The invention discloses a phase change energy storage fresh air system for cold and hot pretreatment. The system comprises an energy storage module, a water circulation module, an automatic control module and a monitoring module. The energy storage module is composed of a heat preservation shell, a heat exchange coil pipe, a phase change energy storage pipe array structure and a draught fan. The water circulation module comprises a closed cooling tower, a solar heat collection plate, a circulation water pump, a circulation pipeline and a three-way valve set. The monitoring module is used for monitoring the outlet water temperature of the cooling tower, the outlet water temperature of the solar heat collection plate, and the temperature of phase change materials in phase change energy storage pipes. A monitoring device controls the cooling tower, the solar heat collection plate and the energy storage module to be switched on or off according to the monitored temperature. The system canbe used in both winter and summer, efficient utilization of the phase change materials is achieved, the energy saving effect is achieved, and the requirements for fresh air pre-cooling in summer and pre-heating in winter are met.

The invention relates to a nano VO2 film with a superhydrophilic self-cleaning function and an intelligent temperature control function and a preparation method of the nano VO2 film. The preparation method of the nano VO2 film comprises the steps that firstly, a precursor solution of vanadium dioxide is prepared through a sol-gel method; then a substrate is evenly coated with the precursor solution; and finally one-step annealing is conducted, so that the nano VO2 film is obtained. A corresponding tungsten-doped VO2 film can be obtained by directly adding a tungsten source in the precursor solution, and the phase-change temperature can be adjusted to 32 DEG C; the crystal sizes of VO2 particles can be changed through tungsten ion doping, a certain micro-nano structure is formed on the surface of the substrate, and the superhydrophilic self-cleaning function at the water contact angle of 12 degrees is achieved; in addition, the difference of the light transmittance before the phase change and the light transmittance after the phase change of the film in the position with the visible light transmittance being 80% and the wavelength being 2000 nm is 26%, and an extremely good intelligent temperature control effect is achieved.

The invention relates to the technical field of heating non-combustion cigarettes, in particular to a cooling smoke tube which is formed by extruding master batch into a tube shape and then drying the tube shape, and the master batch comprises tobacco powder, hydroxypropyl methyl cellulose, polyethylene glycol, glycerin and oleic acid. In the application, the cooling material composition and the smoke tube prepared by extruding and drying the composition are provided, and the smoke tube has good deformation resistance and a porous structure on the physical level; in the chemical level, the smoke tube has good phase change performance, so that the smoke tube can be used as a supporting outer layer of a heating cigarette cooling material, the supporting effect is provided, and the suction resistance cannot be reduced; and the device can also be directly used as a cooling section for heating cigarettes and has a good cooling effect.

The invention discloses an inorganic compound crystal CsSb5S8 and a preparation method and application thereof. The chemical formula of the inorganic compound crystal is CsSb5S8, the inorganic compound crystal belongs to a monoclinic system, and the space group is P21/n. The cell parameter Z is 4. The glass transition temperature of the inorganic compound crystal is about 202 DEG C, the conductivity of the crystalline state is 1.2 times that of the glass state, and the inorganic compound crystal has good phase change performance, is a novel inorganic phase change compound and has excellent application value in the field of phase change memories.