34results about How to "The phase transition process is reversible" patented technology

This invention relates to preparation method of a facies change stuff microcapsule. It takes paraffin as phase-change material, takes toluene diisocyanate and urea-formaldehyde resin as cyst wall stuff, by interfacial polymerization and in situ polymeric method to carry out microencapsulate, to prepare double deck, microcapsule packed paraffin phase-change material. This method could prepare microcapsule phase-change material that contain any specification paraffin from 1% to 70%. Transformation temperature of this phase-change material is adjustable from 0 to 70 deg.C. This compound phase-change material can directly apply to construction region, textile region, and martial region and so on.

The invention discloses a method for preparing a linear polyurethane phase change material. The method comprises the following steps: dissolving polyethylene glycol and diisocyanate into solvent in inert atmosphere, reacting in the presence of optional catalyst, adding tertiary amine type chain extender containing hydroxyl for chain extension, adding an optional neutralizer for salt formation so as to obtain the linear polyurethane phase change material, wherein the molar ratio of the sum of hydroxyl of polyethylene glycol and hydroxyl of chain extender to the isocyanate group of diisocyanate is 1:1, the add amount of the catalyst accounts for 0-1% the total weight of the polyethylene glycol, diisocyanate and chain extender, the molar ratio of neutralizer to tertiary amine type chain extender is 0-1, and the molecular weight of the polyethylene glycol is higher than 2000. The linear polyurethane phase change material prepared by the method has a linear structure and large enthalpy of phase change, has a simple preparation method, is low in cost, has stable property, can be stored for long time, is not solidified and cross-linked, is easy to process and shape, and is beneficial to large-scale popularization and application.

The invention discloses phase change modified asphalt and a preparation method thereof and relates to asphalt and a preparation method of the asphalt, solving the problem of high-temperature ruts of the traditional asphalt concrete pavements. The phase change modified asphalt consists of the following components by weight: 7-8 parts of asphalt and 2-3 parts of organic phase change material. The preparation method comprises the following steps: (1) weighing the asphalt and the organic phase change material; (2) heating the weighed asphalt to 140-175 DEG C and maintaining the temperature for 3 hours; heating the weighed organic phase change material to 100 DEG C, and after the organic phase change material is completely molten into a liquid state, pouring the asphalt; and meanwhile, shearing for 20-40min by adopting a high-speed shearing and emulsifying machine to obtain the phase change modified asphalt. The phase change temperature of the phase change modified asphalt is between 40 DEG C and 75 DEG C, the phase change latent heat is larger than 25J/g, and the phase change modified asphalt has the advantages of larger phase change latent heat, no toxicity, no corrosivity and simple preparation. The invention is applied to the field of asphalt concrete pavements.

The invention relates to an after-finishing technology of a textile fabric, in particular to a phase-change thermoregulation textile fabric and a method for preparing the phase-change thermoregulation textile fabric, belonging to the technical field of textile materials and textile material processing. According to the technical scheme disclosed by the invention, the method for preparing the phase-change thermoregulation textile fabric comprises the following steps: adding a mixture of a catalyst and citric acid as well as a cross-linking agent into polyethylene glycol solution to prepare a padding solution, wherein the catalyst is the MgCl2.6H2O, and the cross-linking agent is the dimethylol dihydroxy-ethylene urea; and subjecting polyethylene glycol and the cellulose of a cotton fabric to cross-linking reaction by adopting the polyethylene glycol cross-linking and depositing method through the padding process, the baking process and other after-finishing modes under the action of a proper amount of cross-linking agent, and depositing the product of reaction on the textile fabric to obtain the phase-change thermoregulation textile fabric. The process for preparing the phase-change thermoregulation textile fabric is simple and convenient to operate, and suitable for industrial production. The phase-change thermoregulation textile fabric prepared by adopting the method has the characteristics of washing fastness and good durability and has the bi-directional thermoregulation function, wide adaptability and obvious cost-performance ratio advantage.

The invention relates to a functional textile fiber material, and particularly relates to a controllable temperature phase-change induction fiber and a preparation method thereof. The preparation method comprises the steps of: mixing a regenerated silk fibroin film prepared from silk fibroin with polyethylene glycol according to the mass ratio of (9-7): (1-3), dissolving the mixture into a hexafluoroisopropanol solution, and preparing a blend spinning fluid of which the concentration is 6-20%w/w after vacuum defoaming and filtering; and controlling the distance from an injector head of a spinning container to a liquid solidification collection net at 10-15cm by adopting an electrostatic spinning process, wherein the voltage of a high-tension supply is 5-9kv, and obtaining a micro-nano fiber felt, namely the controllable temperature phase-change induction fiber. The controllable temperature phase-change induction fiber can induce absorption or discharge heat conversion function through a phase-change material when the temperature of an external environment changes, has two-way temperature phase-change induction adjustment and adaptability functions, and can be repeatedly used in a temperature oscillation environment.

The invention discloses a lanthanide cerium-doped pure antimony pure-antimony nanometer phase-change material, the component expression of which is CexSby, wherein the x and y are atomic percent, 0<x<=0.10, 0.90<y<=1, and x+y=1.00. The provided phase-change material can realize a reversible phase change process, and difference between high and low resistance before and after phase change is large,so that the material is easy to realize "0" or "1" needing to be distinguished during storage, and is a more ideal phase change storage material; and the preparation process is mature, and easy to realize compatibility with the existing semiconductor technology. The material inherits the advantages of pure antimony phase synthesis fast phase-change speed, and meanwhile, can have higher crystallization temperature and data retention, has higher crystalline-state and amorphous-state resistance, and reduces power consumption of a corresponding phase change random access memory.

The invention discloses a carbon fiber-added microcapsule shape-stabilized phase-change material and a preparation method thereof. The carbon fiber-added microcapsule shape-stabilized phase-change material comprises the following components in parts by weight: 50 to 100 parts of a core material, 200 to 500 parts of chloroform, 0.2 to 0.6 part of an emulsifying agent, 15 to 30 parts of toluene diisocynate, 6 to 15 parts of ethidene diamine and 0 to 100 parts of distilled water, wherein the core material comprises paraffin, polyethylene and carbon fiber powder, and the weight ratio of the paraffin to the polyethylene to the carbon fiber powder is (30-70):(20-50):(5-15). The microcapsule shape-stabilized phase-change material provided by the invention adopts the polyethylene and the carbon fiber as composite supporting materials, the mechanical strength of the microcapsules is greatly enhanced, the microcapsules are not broken when 10-Kg pressure is applied, and the microcapsule shape-stabilized phase-change material can be widely applied to various aspects in the field of buildings and in the fields of military, civil use, household appliances and the like. The carbon fiber-added microcapsule shape-stabilized phase-change material is wrapped by an interface polymerization method, loss of the paraffin can be retarded or stopped, heat storage and release functions of the phase-change material are guaranteed, the service life of the phase-change material is prolonged (after heat storage and release is conducted for 50 times, attenuation is zero), and the carbon fiber-added microcapsule shape-stabilized phase-change material can adapt to more use environments.

The invention discloses a phase-change material with the phase-change temperature of minus 15 DEG C. The phase-change material comprises the following components in percentage by weight: 5-25 percent of ammonium chloride, 2.5-25 percent of crylic acid, 5-15 percent of alum, 5-25 percent of maleic anhydride, 5-10 percent of carboxymethyl cellulose sodium, 5-25 percent of oil and the balance of water. Due to the mode, the phase-change material with the phase-change temperature of minus 15 DEG C is large in latent heat of phase change, stable in performance, reversible in phase change process, wide in raw material source, low in cost, safe and reliable, has no phase separation phenomenon after being used for a long time and can be circularly used for more than ten thousand times; the consumption of electric energy is reduced; the positive effects of saving energy and reducing emission are achieved; and the phase-change material can be popularized and applied in refrigerating and freezing processes in food stuff, medicines and the like.

A phase change energy storage material prepared from oleic acid or esters of the energy storage material is characterized in that the general molecular formula of the material is CH3(CH2)7CHOH-CHOH(CH2)7COOR, wherein R is H, CH3 or CH2CH3. The material belongs to the compound of fatty acid derivatives and has phase change temperature between 35 DEG C and 130 DEG C and phase change latent heat of 110-206kJ/kg. The material has the advantages of controllable phase change temperature and wider range of phase change temperature.

The invention discloses a phase-changing material-based adjustable slow light device. The adjustable slow light device comprises a dielectric substrate, a phase-changing material, a dielectric protection layer and a metal structure which are sequentially arranged. The invention also provides fabrication method and application of the phase-changing material-based adjustable slow light device. The phase-changing material and a metal periodic pattern structure are combined, and control of slow light of the device is achieved by various stimulation means such as light, power and by means of various advantages of wide dielectric constant change frequency range, large change quantity and versatile phase-changing conditions of the phase-changing material. Moreover, the device also has the characteristics of wide integration, wide working frequency range and processing flexibility.

The invention relates to an organic additive phase-change material used for air conditioning cold storage, and is prepared by forming an organic eutectic body of aminoethanol with mass ratio of 99.4 percent-98 percent and 0.6-2 percent of water, wherein, aluminium powder with a mass ratio of 1-5 percent, and particle size of 1-4Mum is added and mixed into the eutectic body. The phase-change temperature of the material is 6-9.2 DEG C; the phase-change latent heat is 155-196kJ/kg; the liquidus thermal conductivity is 0.27-0.48W/(m.k). The invention has the advantages that the phase-change temperature is proper; the latent heat is high; the condenser depression is low; the chemical stability is good; the thermal conductivity is high; in the application of the invention to the air conditioning cold storage system, a general refrigerating battery can be directly adopted for the cold storage, thus effectively improving the property coefficient of the refrigerating battery and lowering the energy consumption of the system.

The invention relates to a phase-change material, specifically to an inorganic phase-change constant-temperature material and a preparation method thereof. The inorganic phase-change constant-temperature material comprises calcium chloride hexahydrate, maleic anhydride, silicon dioxide, sodium carboxymethyl cellulose, acrylic acid, sodium chloride, boric acid and expanded graphite, wherein the total amount of the boric acid and the expanded graphite accounts for 4-12% of the total amount of the inorganic phase-change material; and the mass ratio of the boric acid to the expanded graphite is (2-6): (2-6). The inorganic phase-change constant-temperature material provided by the invention has a phase-change temperature of 17 DEG C, a supercooling degree of 0.3 DEG C and a phase-change latentheat of no lower than 189 KJ/Kg; the phase-change process is reversible, and the number of times of recycling is not lower than 10000; in the circulation process, the situation that the thermophysicalproperty is degraded does not exist; meanwhile, the inorganic phase-change constant-temperature material is not prone to leaking from a base body.

The invention relates to a phase-change material, in particular to an inorganic phase-change constant-temperature material and a preparation method thereof. The inorganic phase-change constant-temperature material comprises calcium chloride hexahydrate, strontium chloride hexahydrate, maleic anhydride, sodium formate, sodium chloride, potassium persulfate, boric acid and expanded graphite; whereinthe total amount of the boric acid and the expanded graphite accounts for 2-12% of the total amount of the inorganic phase-change constant-temperature material; wherein the mass ratio of the boric acid to the expanded graphite is (1-6): (1-6). According to the inorganic phase-change constant-temperature material, the phase-change temperature is 39 DEG C, the supercooling degree is 0.3 DEG C, thephase-change latent heat is not lower than 221 KJ/Kg, the phase-change process is reversible, and the number of times of recycling is not lower than 10000; and in addition, the situation of thermal physical property degradation does not exist in the circulation process, and leakage from a base body is not likely to happen.

The invention provides a ceramic sand-like composite phase change material and a preparation method thereof, and relates to a phase change material and a preparation method thereof. The purpose of the present invention is to solve the problem of high temperature rutting on the existing asphalt concrete pavement. The material of the present invention comprises, by weigh, 7-8 parts of ceramic sand, and 2-3 parts of an organic phase change material. The preparation method comprises the following step: 1, weighing the ceramic sand and the organic phase change material; 2, carrying out crushing grinding, screening, water washing, and drying on the ceramic sand; 3, uniformly mixing the organic phase change material and the ceramic sand according to a mass ratio of 3:7, carrying out vacuum drying, adding mineral powder with a volume fraction of 0.5%, and carrying out drying and screening to obtain a composite material; 4, immersing the composite material in an epoxy emulsion, and holding for 3-5 s, and spreading iron powder on the surface to obtain a mixed material; and 5, repeated performing the step 4 3-5 times to obtain the material of the present invention. The material of the present invention has a phase change temperature of 40-75 DEG C and a phase change latent heat more than 40 kJ/kg, and is applicable for the field of asphalt concrete pavements.