4324 results about "Polydimethylsiloxane" patented technology

The invention discloses a preparation method and application of a polydimethylsiloxane super-hydrophobic anti-icing and deicing material, and belongs to the technical field of polydimethylsiloxane coatings and anti-icing and deicing coating paints in the fields of ships, airplanes, high-speed rails, ocean engineering and the like, and the preparation method comprises the following steps: preparing PDMS / CNTs porous foam by using polydimethylsiloxane and carbon nanotubes; and carrying out spraying modification on the PDMS / CNTs porous foam by using the CNTs / SiO2 super-hydrophobic composite coating solution, and curing to obtain the polydimethylsiloxane super-hydrophobic anti-icing and deicing material. The prepared polydimethylsiloxane super-hydrophobic anti-icing and deicing material can be used for photo-thermal deicing and defrosting, and has excellent photo-thermal stability, excellent super-hydrophobicity, good corrosion resistance and good wear resistance. The polydimethylsiloxane super-hydrophobic anti-icing and deicing material prepared by the preparation method disclosed by the invention has a good ice melting effect and defrosting capability.

The invention relates to a self-cleaning nano coating material and a preparation process thereof, and belongs to the technical field of functional coatings. The coating material is prepared from nano silicon dioxide, nano aluminum oxide, graphene nanosheets, nitrogen-doped titanium dioxide, fluorinated silane, polyurethane, polydimethylsiloxane, a microcapsule repairing system, ethanol and deionized water according to a specific proportion through a multi-layer composite structure. The preparation process comprises the steps of base material surface pretreatment, reinforced particle surface modification, base material dissolution, functional additive introduction and multi-layer coating preparation. Through bottom layer enhancement, middle layer flexible buffering and surface layer functional design, excellent mechanical strength, wide-spectrum photocatalytic performance, self-repairing capacity and environmental adaptability are achieved. The problems that in the prior art, a self-cleaning coating is insufficient in mechanical performance, low in photocatalytic efficiency, lack of a self-repairing function and poor in weather resistance are solved, the service life of the coating is remarkably prolonged, and the functional stability of the coating is remarkably improved.

The invention relates to a photo-thermal super-hydrophobic multifunctional anti-icing coating as well as a preparation method and application thereof. The photo-thermal super-hydrophobic multifunctional anti-icing coating comprises primer and finish paint, the primer comprises the following raw materials in parts by weight: 20-25 parts of bisphenol A type epoxy resin and / or fluorine modified epoxy resin, 10-20 parts of fluorine modified polyacrylic resin and / or polyurethane resin, 5-10 parts of a curing agent and 40-55 parts of a solvent; the finish paint comprises the following components in parts by weight: 2-5 parts of polytetrafluoroethylene, 1-3 parts of soluble polytetrafluoroethylene, 1-5 parts of polydimethylsiloxane and 85-90 parts of fluorinated MOF dispersion liquid. Compared with the prior art, the photo-thermal super-hydrophobic multifunctional anti-icing coating provided by the invention has the characteristics of super-hydrophobicity, rapid ice melting, wear resistance, reduction of ice adhesion strength and reduction of icing amount, can effectively solve the problem of icing of an aluminum conductor of a power transmission line of a power system, and can be applied to power equipment such as the aluminum conductor of the power transmission line.

The invention relates to an oil-resistant flame-retardant composite sealing material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. Fluororubber, nitrile rubber, ethylene propylene diene monomer, chlorinated polyethylene and maleic anhydride grafted polypropylene are adopted to prepare composite rubber according to a certain proportion; then adding hydrogenated polyisobutene, a vinyl polydimethylsiloxane-polymethylsiloxane silsesquioxane cross-linked polymer, an E-GMA-VA terpolymer, magnesium hydroxide, basalt fiber powder, ammonium polyphosphate, triphenyl phosphate, expansible graphite, zinc borate, a vulcanizing agent, an accelerant, an anti-aging agent, a plasticizer and other components according to a proportion, and performing banburying in special steps; the prepared sealing material has good mechanical properties, especially has oil resistance and flame retardance, and the service life is greatly prolonged.

The invention discloses a UV (ultraviolet) adhesive for a difficult-to-adhere material, which is prepared from the following components in parts by weight: 100 parts of acrylic acid modified polydimethylsiloxane or chain-extended acrylic acid modified polydimethylsiloxane, 10 to 80 parts of acrylate monomer and 0.5 to 5.0 parts of free radical photoinitiator. The UV-cured acrylic acid modified organic silicon adhesive has excellent bonding strength on a silica gel cap and a PET (polyethylene terephthalate) film, can reach the damage degree of a silica gel cap material, and meets the harsh requirements of a keyboard bonding process and bonding strength.

A displacement sensor including an optical whispering gallery mode (WGM) microresonator and a package encasing at least a portion of the WGM microresonator, the package comprising polydimethylsiloxane (PDMS). The WGM microresonator can be configured as a sensor and used in a displacement detection system that can detect displacement with high quality. Artificial intelligence can be implemented in the displacement detection system for improved sensing of different variables and / or pinpointing the location of perturbations.

The invention discloses a micro-fluidic chip device for cell fusion and in-situ sorting. The micro-fluidic chip device comprises a PDMS (Polydimethylsiloxane) micro-fluidic chip, a PCB (Printed Circuit Board) and a patterned gold electrode micro-array layer which are sequentially arranged from top to bottom, the PDMS micro-fluidic chip is provided with a sample inlet, a sample outlet and a collection cavity, and the sample inlet, the sample outlet and the collection cavity are communicated through the experiment cavity; a plurality of independent channels and a capturing cavity connected with the independent channels are arranged in the experiment cavity, and a double-cavity capturing structure is arranged at an inlet of the capturing cavity; and an independent microelectrode matched with the double-cavity capture structure is arranged on the patterned gold electrode microarray. The independent microelectrodes on the patterned gold electrode microarray layer are matched with the double-cavity capture structure, so that cell capture, cell electrofusion and cell in-situ release can be realized in the same chip, and cells in the double-cavity capture structure can be controlled more accurately.

The invention relates to the technical field of polyester fibers, in particular to a high-strength wear-resistant polyester fiber and a preparation method thereof. The invention aims to solve the problem that the mechanical strength and wear resistance of the existing polyester fiber are difficult to consider at the same time. The preparation method comprises the following steps: carrying out esterification and polycondensation on terephthalic acid, ethylene glycol, hydroxyl-terminated polydimethylsiloxane and isophthalic acid to obtain modified PET; the preparation method comprises the following steps: respectively carrying out oxidation treatment on graphene and a multi-walled carbon nanotube, and then adding polyether amine for grafting; carrying out melt blending with PET slices to obtain nano master batches; carrying out melt blending on the chopped glass fibers and the PET slices to prepare micron master batches; and mixing the modified PET, the nano master batch and the micron master batch, carrying out ultrasonic dispersion, adding an auxiliary agent, and carrying out melt spinning, three-section stretching and three-section heat setting treatment to obtain the high-strength wear-resistant polyester fiber. Through the synergistic effect of the components and the process, the prepared fiber has excellent mechanical properties and wear resistance, and has wide application prospects in the fields of clothing, home textiles, industry and the like.

The invention relates to a mildew-proof silicone sealant with high curing rate and high adhesive strength, and belongs to the technical field of adhesives. The anti-mildew coating is prepared from alpha, omega-dihydroxy polydimethylsiloxane, dimethyl silicone oil, fumed silica, phenoxy resin coated nano calcium carbonate, a modified hydroxypropyl-gamma-cyclodextrin loaded mildew preventive, dibutyltin dilaurate, methyltrimethoxysilane and a curing accelerator. According to the mildew-proof silicone sealant with the high curing rate and the high adhesive strength, the surface drying time is 9-13 minutes, the 24-hour curing depth is 6.3-7.2 mm, the adhesive strength is 3.0-3.6 MPa, the tensile strength is 5.8-6.4 MPa, the shear strength is 3.0-3.9 MPa, the elongation at break is 410-457%, and the mildew-proof grade is 0 grade in 30 days, 60 days, 180 days and 360 days.

The invention relates to the field of physiological status detection, and provides a wearable microfluidic fluorescence sensor based on a Janus membrane for sweat analysis. The sensor comprises a Janus membrane-based micro-fluidic chip and a fluorescent sensing layer which are stacked, the Janus membrane-based micro-fluidic chip comprises a hydrophobic nanofiber membrane, a bottom polydimethylsiloxane layer, a hydrophilic nanofiber membrane and a top polydimethylsiloxane layer which are stacked, and the fluorescent sensing layer comprises three paper chips, the simultaneous fluorescence detection of chloride ions, glucose and pH of sweat is realized. The Janus membrane with the directional water conveying capacity is used as a substrate for preparing a micro-fluidic chip. In one aspect, sweat may be automatically delivered to an analysis zone along a designed path. On the other hand, sweat is transferred from a hydrophobic membrane close to the skin to a hydrophilic membrane, sweat accumulation is effectively avoided, and a comfortable skin microenvironment is promoted. A Janus membrane-based micro-fluidic chip is combined with fluorescence sensing, a micro-fluidic fluorescence sensor based on a Janus membrane is constructed, and simultaneous high-stability and high-accuracy analysis of multiple targets in human sweat is realized.

The invention discloses a preparation method and application of a tension sensor for monitoring cortisol in sweat. According to the scheme, on the basis of a stretchable electrode (SWNTs / PDMS) which is prepared by patterning in a manner that a single-walled carbon nanotube is subjected to suction filtration and transfer printing on polydimethylsiloxane, cortisol is used as an imprinting molecular template by utilizing an electrochemical deposition technology, and Prussian blue (PB) and pyrrole (Py) are electrically polymerized to prepare an electrochemical sensor of a molecularly imprinted polymer (MIP), so that the change of the concentration of cortisol in sweat can be monitored in real time; a reliable and practical method is provided for rapid and pressure-free pressure monitoring. A scanning electron microscope is used for electrode modification morphology characterization, and an electrochemical workstation is used for electrode sensing performance characterization. The sensor realizes the function of dynamically monitoring the day and night change rule of cortisol in sweat, and has the characteristics of real-time detection, high sensitivity and selectivity and good stability.

The invention discloses a double-layer microneedle patch and a preparation method thereof.The preparation method of the double-layer microneedle patch comprises the following steps that firstly, 3D printing is conducted through polydimethylsiloxane, and a PDMS mold similar to a machining microneedle is obtained; dispersing the medicine into the sericin solution to serve as an outer layer solution; dispersing germanium nanoparticles into the polycaprolactone solution to obtain an inner layer solution; and finally, adding the outer-layer solution into the needle-shaped groove of the PDMS mold, so that the needle-shaped groove is filled with the outer-layer solution, drying, adding the inner-layer solution, drying, and demolding to obtain the double-layer microneedle patch. When the double-layer microneedle patch is used for drug delivery, drugs can be dissolved and released in a short time, the inner layer is polycaprolactone (PCL) carrying photo-thermal agent germanium nanoparticles, degradation is slow, a photo-thermal effect is generated under irradiation of 808nm near-infrared light, residual tumor cells are induced to die immunogenicity, an immune microenvironment is programmed in a time sequence, and the double-layer microneedle patch has the advantages of being high in sensitivity, high in sensitivity and good in stability. Postoperative recurrence and metastasis of tumors are efficiently inhibited, and meanwhile operative wound repair is promoted.

The invention relates to a waterborne polyurethane sizing agent, a preparation method thereof and a carbon fiber, and belongs to the technical field of carbon fiber preparation. The preparation method of the waterborne polyurethane sizing agent comprises the following steps: S10, dispersing and mixing amino modified polydimethylsiloxane and graphene oxide in an organic solvent, carrying out grafting reaction, and carrying out vacuum drying to obtain amino modified polydimethylsiloxane grafted graphene oxide; s20, mixing polyether glycol, diisocyanate and a hydrophilic chain extender, and carrying out a first reaction to obtain a first reaction solution; mixing the first reaction liquid, a small molecule chain extender and amino modified polydimethylsiloxane grafted graphene oxide for second reaction to obtain a polymerization system; and carrying out a neutralization reaction on the polymerization system and a neutralizer, and dispersing in water to obtain the waterborne polyurethane sizing agent. The waterborne polyurethane sizing agent can effectively increase the surface roughness of carbon fibers and improve the interfacial shear strength between the carbon fibers and a resin matrix.

The invention discloses a film-forming composition and a lip makeup product containing the same. The film-forming composition comprises the following components: phenyl silicone oil, wherein the phenyl silicone oil comprises two or more than two of diphenyl polydimethylsiloxane, trimethyl pentaphenyl trisiloxane, phenyl polytrimethyl siloxane and trimethyl siloxy phenyl polydimethylsiloxane; the viscosity of the phenyl silicone oil at the temperature of 25 DEG C is 50 mPa.s to 500 mPa.s; the film-forming agent comprises at least one of hydrogenated polyisobutene and polyisobutene; and the viscosity of the film forming agent at 75 DEG C is 1500 mPa.s to 2500 mPa.s. The mass ratio of the phenyl silicone oil to the film-forming agent is (2-5): 1. The film-forming composition provided by the invention is applied to a formula system of a lip makeup product, and the phenomena of cup staining, fading and the like of the lip makeup product can be reduced.

The invention relates to the technical field of hydrogen production by alkaline electrolyzed water, in particular to an anti-stripping alkaline electrolyzed water diaphragm casting solution, a diaphragm, a preparation method and application. The anti-stripping alkaline electrolyzed water diaphragm casting solution is prepared from the necessary solvent, the polydimethylsiloxane material, the polysulfone material, the inorganic nano-particles, the pore-forming agent, the cross-linking agent and the catalyst, and the polydimethylsiloxane material, the cross-linking agent and the catalyst act together, so that the enveloping of the inorganic nano-particles can be improved; the mechanical property of the membrane casting liquid on the membrane supporting layer is improved, and the anti-stripping effect is achieved. The diaphragm prepared by adopting the alkaline electrolyzed water diaphragm casting solution shows relatively low sheet resistance and stripping resistance, is good in air tightness, and is suitable for preparing the diaphragm of alkaline electrolyzed water hydrogen production equipment, so that the effects of maintaining free movement of ions in an electrolytic bath and blocking mixing of hydrogen and oxygen are achieved.

The invention relates to the technical field of polyurethane films, in particular to a long-acting, stable, flexible, impact-resistant and resistance-reducing protective film and a preparation process thereof. According to the invention, the raw materials such as polyethylene glycol, a modified fluorosilicone monomer, isophorone diisocyanate, hydroxyethyl acrylate, an acrylic antifouling monomer, dodecafluoroheptyl methacrylate and the like are added to prepare the anti-drag coating. Mixing a polyurethane thermoplastic elastomer, aminopropyl polydimethylsiloxane, an antioxidant and an ultraviolet light absorber, and carrying out melt extrusion and blow molding to form a film, so as to obtain a flexible impact-resistant base film; and uniformly coating the surface of the flexible anti-impact base film with the anti-drag coating, and carrying out ultraviolet curing to obtain a finished product. The finished product prepared by the invention has good impact resistance, and can effectively reduce frictional resistance, so that the finished product has wide application prospects in the technical field of polyurethane films.

Disclosed in the present invention are a fluorosilicone-modified low-surface-energy antifouling coating and a preparation method therefor. The coating comprises the following components in parts by weight: 11-15 parts of butyl acrylate, 3-4 parts of dodecafluoroheptyl methacrylate, 3-4 parts of vinyl-terminated polydimethylsiloxane, 3-4 parts of 2-hydroxy-4-acryloyloxybenzophenone, 30-38 parts of methyl isobutyl ketone, 0.15-0.25 parts of azobisisobutyronitrile, 0.1-0.2 parts of sodium hydroxide, 2-3 parts of modified titanium dioxide nanoparticles, and 0.5-1.5 parts of 3-aminopropyltriethoxysilane. In the present invention, vinylpentamethyldisiloxane reacts with decamethylcyclopentasiloxane to prepare vinyl-terminated polydimethylsiloxane; a titanium dioxide precursor is mixed with polydopamine nanoparticles for modification to prepare modified titanium dioxide nanoparticles; and then the components above are mixed to prepare the fluorosilicone-modified low-surface-energy antifouling coating. The coating has low surface energy and good adhesion and ultraviolet resistance.

The invention belongs to the technical field of super-hydrophobic materials, and particularly relates to a preparation method and application of magnetic response multifunctional super-hydrophobic biomass aerogel. The super-hydrophobic PDMS-coated CMIL-101 / CS aerogel is prepared by combining chitosan (CS), a magnetic porous carbon material (CMIL-101) and polydimethylsiloxane (PDMS) through a freeze drying technology, so that efficient oil-water separation and organic pollutant microplastic removal are realized. The aerogel utilizes magnetic response and photo-thermal characteristics, promotes oil adsorption and treats high-viscosity oil in a magnetic field, simplifies the purification process, and has important application value for water body remediation.

The invention relates to the technical field of thermal management material preparation, solves the technical problems of loose heat conduction network structure and non-uniform heat conduction direction of a flexible composite phase change material, and particularly relates to a magnetic polymer-based flexible composite phase change material and a preparation method thereof. Comprising the following steps: preparing a modified polydimethylsiloxane prepolymer from a carbon nanotube dispersion liquid and a polydimethylsiloxane prepolymer; adopting a Pickering emulsion method to mix 42 # paraffin, the modified polydimethylsiloxane prepolymer and nano cellulose to prepare a composite phase change material emulsion; silver mirror reaction is adopted to carry out surface silver plating on the magnetic neodymium iron boron particles; the magnetic polymer-based flexible composite phase change material is prepared from the composite phase change material emulsion and the surface-silvered magnetic neodymium iron boron particles. The high flexibility and magnetism of the prepared material in a normal temperature state endow the material with a more convenient installation mode and lower contact thermal resistance, the heat conduction network structure and component compatibility of the material are improved, and the application requirements of a phase change thermal management technology can be met.

The preparation method comprises the following steps: firstly, uniformly stirring and mixing synthetic fluorophlogopite, silica, polymethylsilsesquioxane, boron nitride, bismuth oxychloride, zinc stearate, aluminum starch octenylsuccinate, mica, aluminum oxide, hydrolyzed sodium hyaluronate and toner in a stirring homogenizer; then uniformly mixing polydimethylsiloxane, octyldodecanol stearoyloxy stearate, isoamyl laurate, diisostearyl malate, phenoxyethanol and caprylyl glycol, and heating to 45 + / -5 DEG C; pouring the mixture into an oil spraying barrel of a stirring homogenizer, uniformly stirring and mixing while spraying oil, crushing, then carrying out airflow crushing, sieving the material, putting the sieved material into a mold plate, and carrying out compression molding, so as to obtain a pressed powder block; and putting the mixture into a packing material powder box to obtain the make-up fixing and brightening pressed powder. The pressed powder is prepared by adding an airflow crushing process, the particle size of the powder is smaller, the powder is dispersed more uniformly, the powder is pressed into the solid pressed powder, and the phenomenon of powder flying is well reduced while makeup fixing and brightening effects are achieved.

The invention relates to the technical field of flexible pressure sensors, in particular to a preparation method and application of a capacitance flexible pressure sensor with an adjustable gradient random micro-cone structure, and the sensor comprises an upper electrode and a lower electrode which are transparent indium tin oxide conductive films (PET / ITO); the packaging layer is a polyimide (PI) adhesive tape and covers the outer side of the electrode; the flexible isolation layer is polydimethylsiloxane (PDMS) with a hollow structure, and is positioned between the upper electrode and the lower electrode; the dielectric layer of a gradient random micro-cone structure is located in the flexible isolation layer and is formed by compounding polyvinyl alcohol (PVA) and phosphoric acid (H3PO4) according to the mass ratio of 1: 1; the gradient micro-cone structure and the ionization effect are combined, the electric double layer effect grading phenomenon occurs, and the gradient micro-cone sensor has the advantages of being high in sensitivity, wide in detection range, capable of keeping linearity under large pressure, short in response time and good in cycling stability.

The invention relates to a preparation method of a high-antibacterial hydrophobic polyamide fiber. The preparation method comprises the following steps: carrying out melt extrusion grafting on polyamide, a quaternary ammonium salt monomer, an initiator and an auxiliary agent to prepare quaternary ammonium salt grafted polyamide; and carrying out melt blending on the prepared quaternary ammonium salt grafted polyamide, polyamide, cuprous oxide and polydimethylsiloxane to obtain the high-antibacterial hydrophobic nylon composite material. And spinning the high-antibacterial hydrophobic nylon composite material to obtain the high-antibacterial hydrophobic polyamide fiber. The high-antibacterial hydrophobic nylon composite material prepared by the method disclosed by the invention can realize efficient antibacterial performance, and the high antibacterial hydrophobic performance of the prepared polyamide fiber is improved.

The invention provides a preparation method of a bionic microfluidic device for researching fluid migration in carbonate rock micro-nano fractures, which comprises the following steps: step 1, analyzing and classifying scanning electron microscope images of carbonate rock core slices through a random forest algorithm to generate a chip design drawing; step 2, based on the chip design drawing, re-etching a crack structure through a photoresist template and polydimethylsiloxane by adopting a soft lithography technology, and bonding with a glass substrate to form a micro-fluidic chip; and step 3, injecting a precursor liquid containing the calcite nano seed crystal into the micro-fluidic chip flow channel, fixing the seed crystal through ultraviolet irradiation, and injecting a saturated equilibrium liquid to realize calcium carbonate mineral precipitation so as to form the bionic micro-fluidic device. The method can be used for coupling research of all fluids and carbonate rock fractures, and a method for recovering the carbonate rock fracture structure to the maximum extent and a rock surface property cloning method are provided.

The invention relates to the technical field of synthetic fibers, in particular to a high-elasticity textile fiber and a preparation process thereof. The high-elasticity textile fiber is prepared from the polyurethane-polyamide elastomer and the modified diatomite master batch through melt spinning, drafting and winding. According to the invention, hydroxyl-terminated polydimethylsiloxane is used as polyol, and the molar ratio of the polyurethane prepolymer to the polyamide prepolymer is controlled, so that the prepared polyamide-polyurethane elastomer slice has good heat resistance; the molar ratio of isocyanate to polyol and the molar mass ratio of caprolactam to adipic acid are controlled, so that the prepared textile fiber is excellent in mechanical property; 2, 2-dimethylolpropionic acid is used for a chain extension reaction, the molar ratio is controlled, the moisture regain of the prepared textile fiber is 8.58%, and the moisture absorption is high; the diatomite is modified by the quaternary ammonium salt compound, and the addition proportion is adjusted, so that the prepared spinning fiber has good antibacterial performance.

The invention discloses an anti-pollution flashover coating with arc durability, which comprises the following components in parts by weight: 100 parts of hydroxyl-terminated polydimethylsiloxane, 10-25 parts of dimethyl silicone oil, 5-15 parts of a phosphorus flame retardant, 8-20 parts of white carbon black, 5-15 parts of modified mica powder, 15-30 parts of modified calcium carbonate, 10-20 parts of modified glass powder, 5-12 parts of aluminum hydroxide, 5-10 parts of 1, 3-butanediol, 5-10 parts of a flame retardant, 1-5 parts of an anti-aging agent, 1-5 parts of an anti-aging agent, and 1-5 parts of an anti-aging agent. The invention discloses a high-temperature-resistant coating which is prepared from the following components in parts by weight: 0.5-2 parts of 1, 2-bis (trimethoxysilyl) ethane, 5-10 parts of potassium titanate whiskers, 2-6 parts of color paste, 50-150 parts of a solvent, 3-10 parts of a cross-linking agent, 2-6 parts of a silane coupling agent and 1-5 parts of a catalyst. The invention also provides a preparation method of the anti-pollution flashover coating with arc durability. By introducing the modified mica powder, the modified glass powder and the modified calcium carbonate with specific particle sizes and reasonable gradation, the proportion of the filler in the base rubber is ensured, so that the modified mica powder, the modified glass powder and the modified calcium carbonate form a compact and firm ceramic high-temperature-resistant and arc-resistant layer after encountering high temperature of an arc; and the purpose of improving the arc durability is achieved.

The invention discloses a skin chip, a skin model and application of the skin chip and the skin model. The material of the skin chip does not contain polydimethylsiloxane; the skin chip comprises a first chip and a second chip, wherein the first chip is used for providing a bottom accommodating space for a dermal culture medium; the dermal culture chip layer and the epidermal culture chip layer are arranged at the top end of the first chip, and the second chip is used for supplying and storing a culture medium or supplying skin irritants; wherein the skin chip adopts a gravity perfusion mode; the skin chip is detachable, and all layers of the skin chip are connected through a polyimide material or are made of the polyimide material; a culture cavity between the dermal culture chip layer and the epidermal culture chip layer is through up and down; the first chip and the second chip are not provided with electrodes, or the first chip and the second chip are respectively provided with a first electrode and a second electrode. According to the skin chip provided by the invention, the experiment flexibility is enhanced, and the cost is reduced; and a real culture environment can be simulated.

The invention discloses a flexible PI heat-conducting insulating film pad and a preparation method thereof, and relates to the field of film pads. The preparation method comprises the following steps: preparing Fe3O4 magnetic heat-conducting core and SiO2 insulating shell composite nanoparticles by a sol-gel method, treating and grafting epoxy groups by a silane coupling agent, performing ring-opening addition with one end amino group of amino-terminated polydimethylsiloxane, and reacting the other end amino group with polyethylene glycol diglycidyl ether, so that two flexible long chains are grafted on SiO2. Due to the modified composite nanoparticles and the flexible long-chain structure, the flexibility of the film pad is remarkably improved; thermal vibration of silicon-oxygen bonds and ether bonds promotes heat transfer, a hydrogen bond network is formed with a PI substrate to improve dispersion stability, particles are orderly arranged under the action of a high-frequency magnetic field to construct a three-dimensional heat conduction network, and heat conduction efficiency is enhanced; the SiO2 isolates the inner core from conducting and improves the insulating property of the film pad by virtue of good insulativity and no free charge in the flexible long-chain polymer. The flexible PI heat-conducting insulating film pad prepared by the invention has the effects of flexibility, heat conduction and insulation.

The invention discloses a passive radiation refrigeration coating and a preparation method thereof, and relates to the technical field of industrial coatings. Comprising a fluoroacrylate emulsion, hollow glass beads, nano titanium dioxide, flaky silicon dioxide aerogel powder, polytetrafluoroethylene micro powder, hydroxyl-terminated polydimethylsiloxane, a hydroxyl acrylic acid modified silane coupling agent, a super-hydrophobic modified fluorosilicone surface additive, nano cerium oxide, aluminum fluoride doped zinc oxide infrared enhancement powder and deionized water. The paint is prepared on the basis of the formula. According to the invention, a multi-scale spectrum regulation and control and surface self-cleaning system is constructed cooperatively, so that the synergistic effect of high reflection of a sunlight region and high emission of a middle infrared region is realized. The coating can maintain continuous passive refrigeration in a day and night period, the surface of the coating has self-cleaning capability and excellent ultraviolet aging resistance, and high reflectivity and high radiation emissivity can be maintained for a long time in a complex outdoor environment, so that the thermal management efficiency of buildings and equipment is remarkably improved.

The invention provides a pouring sealant and a preparation method thereof. The pouring sealant comprises a component A, a component B, a component C and a component D, wherein the component A comprises hydroxyl-terminated polydimethylsiloxane, inorganic filler, phase change microcapsules and surface-modified hexagonal boron nitride nanosheets; the component B comprises dimethyl silicone oil, a silane cross-linking agent, a silane coupling agent and an organic tin catalyst. The pouring sealant provided by the invention can effectively prevent corrosive ions and the like in salt mist from entering a diode area of the junction box while ensuring the sealing performance of the diode of the junction box, prevents the phenomenon of corroding the diode, and controls the temperature rise of the junction box in operation through effective thermal management, so that the service life of the junction box is prolonged. And the service performance and the service life of the photovoltaic module junction box in an offshore environment are improved and prolonged.

The invention relates to a spinel type high-entropy oxide photo-thermal super-hydrophobic anti-icing coating. The anti-icing coating is prepared from the following raw materials in parts by weight: 10 to 20 parts of spinel type high-entropy oxide, 20 to 40 parts of epoxy resin, 1 to 5 parts of stearic acid solution, 1 to 5 parts of polymethyl methacrylate solution, 5 to 10 parts of polydimethylsiloxane, 0.1 to 1 part of flatting agent, 0.1 to 1 part of dispersing agent, 0.1 to 1 part of defoaming agent, 0.5 to 1 part of curing agent and 30 to 60 parts of solvent. The spinel type high-entropy oxide is a powder material with the particle size of 50-600 nm, and the molecular formula of the spinel type high-entropy oxide is (A) 3O4. Meanwhile, the invention further discloses a preparation method of the coating. A coating prepared from the coating disclosed by the invention realizes coupling characteristics of photothermal conversion and super-hydrophobicity, not only has excellent super-hydrophobicity and light absorption characteristics, but also has good performance stability and durability in corrosion and wear environments.