222 results about "Polydimethyl siloxane" patented technology

The invention relates to the technical field of silicone rubber preparation, in particular to high-flame-retardant insulating liquid silicone rubber and a preparation method and application thereof. The high-flame-retardant insulating liquid silicone rubber is prepared from the following raw materials in parts by mass: 60 to 75 parts of vinyl-terminated polydimethylsiloxane, 5 to 8 parts of methylhydrosiloxane, 20 to 24 parts of a flame retardant, 0.1 to 0.2 part of a platinum catalyst, 25 to 30 parts of modified silicon dioxide and 2 to 3 parts of a silane coupling agent, and the flame retardant is prepared by mixing decabromodiphenyl ethane and modified magnesium hydroxide. The high-flame-retardant insulating liquid silicone rubber not only has excellent flame retardance, insulativity, high-temperature-resistant stability and the like, but also has remarkable advantages in mechanical properties and environmental adaptability, and provides safer and more reliable material choices for related fields.

The invention provides a preparation method of a high-adhesion transparent self-healing super-smooth coating. Polydimethylsiloxane is taken as a matrix, a three-arm type dynamic hydrogen bond network structure is constructed, and 2-ureido-4-pyrimidone (UPy unit) is taken as a crosslinking node to be connected with a siloxane main chain, so that the crosslinking density and the interface binding energy are remarkably improved. According to the invention, a UPy unit is innovatively introduced into a main chain or a side chain to construct two topological structures of (SUP) 2TD or (MUP) 2TD. Compared with (MUP) 2TD, the (SUP) 2TD shows excellent tensile property and self-healing property in both air and underwater environments. The enhancement of this performance is attributed to the improvement of chain displacement capability in (SUP) 2TD. Through interface dynamics, a UPy unit is guided to an interface and interacts with an interface group, and a very strong adhesion effect is obtained. In addition, the coating shows excellent self-healing performance.

The invention discloses a biaxial flexible strain sensor based on laser induced graphene. Comprising a flexible substrate, a flexible sensitive layer, a flexible spacing layer and a flexible upper cover, both the flexible substrate and the flexible upper cover are made of a polydimethylsiloxane (PDMS) material, the flexible sensitive layer is generated on a mixed substrate of polyimide (PI) and multi-walled carbon nanotubes (MWCNTs) through a laser ablation process, and then the sensitive layer is transferred to the PDMS substrate through a substrate transfer process. The flexible sensitive layer adopts an I-shaped structure, and two ends of the flexible sensitive layer are coated with electrode layer external wires. The method can be applied to the fields of wearable electronic equipment and medical monitoring. By means of the I-shaped structure, the sensitive layers in different directions can detect the strain in the main direction, and meanwhile interference caused by the strain in different directions is avoided. The preparation method is simple and efficient, a special gas environment is not needed, patterning preparation of graphene can be completed only through one step, and the production cost is reduced.

The invention belongs to the technical field of angle sensors, and particularly relates to a tilt angle sensor and a preparation method and application thereof. The tilt angle sensor provided by the invention comprises a base body and a micro-channel communicated with any two points in the base body, the micro-channel is filled with gallium-based alloy liquid, the surface of the micro-channel contains a plurality of bulges, and the average height of the bulges is 50-200 microns; the two ends of the micro-channel are sealed by conductive adhesive; the conductive adhesive is connected with the electrode; the matrix is prepared from polydimethylsiloxane. The micro-channel containing the micron-sized bulge structure is arranged in the base body, so that local capillary force gradient can be generated, and the body response speed of the gallium-based alloy liquid is accelerated; and meanwhile, the special structure of the micro-channel has directional textures, so that asymmetric flow resistance and multi-path conductive paths can be generated, and differential resistance changes are generated during inclination to realize multi-directional inclination angle detection. The detection sensitivity and the anti-noise capability of the tilt angle sensor are remarkably improved by inducing a nonlinear flow control effect through the bulges in the micro-channel.

The invention relates to the field of electronic paste, and provides high-performance electronic paste based on a graphene composite material and a preparation method of the high-performance electronic paste. The slurry comprises a surface modified graphene / silicon carbide nanowire hybrid, a carbon-coated silver nanorod, epoxy resin, a polyamide curing agent, a KH-550 coupling agent, polyvinylpyrrolidone, fumed silica, polyether modified polydimethylsiloxane and a compound solvent. By constructing a multi-scale conductive network and an interface enhancement structure, excellent conductivity and shear strength of the slurry are realized. The preparation method comprises the steps of in-situ synthesis and surface modification of the graphene hybrid filler, deposition preparation of the carbon and silver nanorods, and a multi-stage dispersion compounding process of all the components under specific temperature control and shearing conditions, and finally the electronic paste which is stable in structure and excellent in performance is formed and is suitable for scenes such as high-reliability electronic packaging and conductive bonding.

The invention discloses a UV-cured high-weather-resistance optical thin film and a preparation method thereof, and relates to the technical field of optical thin films. The optical film is prepared by taking polyethylene glycol terephthalate as a base material and coating the base material with a UV curing coating, and the UV curing coating comprises the following raw materials in parts by weight: 15-20 parts of aliphatic polyurethane acrylate, 5-8 parts of perfluorobutyl ethyl acrylate, 8-12 parts of hydroxyethyl acrylate, 6-10 parts of 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 1-3 parts of 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 1-3 parts of 1, 2, 4-trimethyl-1, the invention relates to a UV (ultraviolet)-resistant coating which is prepared from the following raw materials in parts by weight: 1-2 parts of 2, 6-hexanediol diacrylate, 5-8 parts of trimethylolpropane triacrylate, 30-40 parts of modified epoxy acrylate, 1-2 parts of a silane coupling agent KH-570, 2-3 parts of a photoinitiator 1173, 0.5-1.2 parts of a modified ultraviolet absorbent UV-327, 0.8-1.5 parts of a hindered amine light stabilizer 540, 0.3-0.8 part of an antioxidant 1010, 0.09-0.12 part of an ultraviolet absorbent Tinuvin400 and 0.2-0.5 part of polyether modified polydimethylsiloxane. According to the UV-cured high-weather-resistance optical thin film, polyethylene glycol terephthalate is used as a base material, key raw materials such as a UV-cured coating with a scientific formula, modified epoxy acrylate and the like are finely prepared, a two-stage curing process is adopted, and the weather resistance is excellent.

The invention belongs to the technical field of rubber sealing rings, and particularly discloses a wading rubber sealing ring and a preparation method thereof, the wading rubber sealing ring comprises the following components by weight: 60-70 parts of modified ethylene propylene diene monomer, 35-50 parts of modified white carbon black, 20-30 parts of hydrogenated nitrile rubber, 0-10 parts of fluororubber, 2-5 parts of polyester fiber, 0.5-3 parts of an anti-hydrolysis agent, and 1-3 parts of a hydrophobic agent. 2-4 parts of an antimicrobial agent, 3-5 parts of an anti-aging agent and 1-7 parts of sulfur; the anti-hydrolysis agent is a mixture of tetrakis [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester and a carbodiimide anti-hydrolysis agent; the hydrophobic agent is a mixture of polydimethylsiloxane and perfluorooctyltriethoxysilane, and the hydrophobic agent is a mixture of polydimethylsiloxane and perfluorooctyltriethoxysilane. The wading rubber sealing rubber ring and the preparation method thereof are suitable for fresh water and warm water scenes, and have wide application prospects in ship sealing and sewage treatment equipment in seawater and industrial wastewater scenes.

The invention discloses a defoaming agent for industrial automobile paint and a preparation method of the defoaming agent. The defoaming agent is prepared from the following raw materials in parts by mass: 20-40 parts of a star block polyether-siloxane copolymer; 10 to 25 parts of nano hydrophobic silicon dioxide aerogel; 30-70 parts of an alkylbenzene solvent (boiling point gt: 200 DEG C); 3 to 8 parts of epoxy group modified polyether siloxane; and 1 to 3 parts of polyether modified polydimethylsiloxane. The molecular weight range of the star block polyether-siloxane copolymer can effectively balance the defoaming property and compatibility, the siloxane chain segment of the star block polyether-siloxane copolymer destroys the elasticity of a foam film, and the siloxane chain segment cooperates with alkylbenzene to reduce local surface tension and accelerate foam rupture. The polyether chain segment and the siloxane chain segment have a synergistic effect, and the polyether chain segment adjusts hydrophilicity to adapt to different environments.

The invention belongs to the technical field of superfine polyester yarn, and particularly discloses a preparation process of superfine denier special-shaped polyester yarn. Comprising the following steps: (1) mixing polyester chips, modified nano bentonite, polydimethylsiloxane, nano zirconium oxide, maleic anhydride grafted polyethylene, modified pottery clay and polyethylene wax powder, stirring at 80-85 DEG C for 30-35 minutes, melting at 240-280 DEG C to obtain a melt, and spinning to obtain cellosilk; (2) cooling and solidifying the cellosilk at the temperature of 20-22 DEG C through cross air blowing to obtain cooled cellosilk; and (3) oiling the cooled cellosilk, and coiling and forming to obtain the superfine denier profiled polyester yarn. The prepared superfine denier special-shaped polyester yarn has good strength and wear resistance, fibers are not prone to breakage in the spinning process, and the quality and durability of the fibers are guaranteed.

The invention discloses a hydrogel modified microelectrode array device and a preparation method thereof, the hydrogel modified microelectrode array device comprises a microelectrode array composite layer, a passivation layer, a hydrogel layer and a cell culture ring, the cell culture ring is arranged on the microelectrode array composite layer, and the passivation layer and the hydrogel layer are located in the cell culture ring; the microelectrode array composite layer comprises a microelectrode array with polydimethylsiloxane as a base material, at least part of the microelectrode array in the cell culture ring is exposed, and at least part of gaps of the exposed microelectrode array are filled with the passivation layer; the hydrogel layer grows on the surface of the polydimethylsilane, and a microgroove is formed in the exposed microelectrode array and passivation layer area to serve as a cell growth area. According to the invention, cell patterning can be realized on the microelectrode array, cell electrophysiological activity can be monitored for a long time, and the microelectrode array has the advantages of remarkable cell patterning promotion capability, high stability and robustness, flexible cell pattern design, excellent biological compatibility and simple process.

The invention belongs to the technical field of cosmetics, and particularly relates to a slow-release permeation-enhancing composition based on a water-in-oil system as well as a preparation method and application of the slow-release permeation-enhancing composition. The slow-release permeation-enhancing type composition is prepared from the following components in parts by weight: 1 to 6 parts of polydimethylsiloxane PEG-10 / 15 cross-linked polymer, 0.1 to 2 parts of PEG-10 polydimethylsiloxane, 2 to 15 parts of polydimethylsiloxane, 2 to 15 parts of glycerol tri (ethylhexoic acid) ester and 0.01 to 2 parts of squalane. The sustained-release permeation-promoting composition has excellent wrapping capacity on active ingredients, oxidation and decomposition of the active ingredients are reduced, and therefore the activity retention rate of the active ingredients is remarkably increased. Moreover, the composition formed by the specific compound components has unique molecular structure and physical properties, and a wrapping system of the composition can effectively control the release rate of the active components, so that the durability and effectiveness of the application effect of the composition are improved, and the permeation promoting effect of the composition is further enhanced.

The preparation process comprises the following steps: performing vacuum dehydration on alpha, omega-divinyl polydimethylsiloxane and phenyl siloxane under the protection of inert gas to prepare a basic rubber material; then adding the modified nano silicon dioxide filler in batches in a gradient manner, and dispersing at a stepped rotating speed to form a uniformly mixed sizing material; then polycarbonate powder treated by a silane coupling agent is introduced for high-speed dispersion to form a component A precursor, and after the component A precursor is mixed with a component B containing a hydrogen silicone oil cross-linking agent / platinum catalyst, the self-adhesive silicone rubber with high interface bonding force is prepared by adopting a stepped temperature procedure; according to the method, the bonding strength of polycarbonate powder is improved through gradient filler dispersion in batches, the tensile strength of the material is improved through silane treatment, the curing reaction rate is matched with the interface wetting speed through a stepped curing procedure, the strength is kept while rapid curing is conducted, and the effects of high bonding strength and rapid curing are effectively achieved.

The invention discloses a hydrophobic anti-icing material based on silver ions and application in a power transmission line, and belongs to the technical field of hydrophobic anti-icing materials, the hydrophobic anti-icing material is prepared from the following raw materials in parts by weight: 80-120 parts of hydroxyl-terminated polydimethylsiloxane, 5-15 parts of tetraethoxysilane, 0.5-3 parts of silver nitrate, 3-10 parts of hydrophobic nano silicon dioxide and 1-5 parts of nano titanium dioxide. The invention discloses an anti-icing and deicing composite material, which is prepared from the following components in parts by weight: 80 to 120 parts of butyl acetate, 0.1 to 0.5 part of dibutyltin dilaurate, 0.5 to 2 parts of sodium citrate and 2 to 5 parts of modified fluorinated phosphotungstic acid imidazole compound, and solves the problems that the existing material is insufficient in photo-thermal utilization rate, poor in stability in a severe environment, insufficient in hydrophobic capacity and difficult to give consideration to anti-icing and deicing effects. According to the scheme, the modified fluorinated phosphotungstic acid imidazole compound and silver ions are introduced to form a synergistic effect, formation of an ice layer is inhibited, melting of the ice layer is promoted, meanwhile, lasting super-hydrophobicity is provided, a durable hydrophobic anti-icing coating based on the silver ions is formed, and the safety of a power grid is guaranteed.

The invention discloses high-temperature-resistant silicone rubber and a preparation method thereof, and belongs to the field of polymer compositions. The silicone rubber is composed of vinyl-terminated polydimethylsiloxane, fumed silica, hydroxyl silicone oil, a hydrogen-containing silicone oil cross-linking agent, a platinum catalyst, an inhibitor methyl butynol, cerium oxide and zinc oxide whiskers. During preparation, vinyl siloxane and 1 / 2 of white carbon black are subjected to vacuum banburying for 40 min at the temperature of 155 DEG C, the remaining white carbon black and hydroxyl silicone oil are added to be mixed for 50 min at the temperature of 125 DEG C, other components are sequentially added after cooling, and vulcanization is conducted at the temperature of 170 DEG C * 15 MPa. The shore A hardness of the obtained silicone rubber is greater than or equal to 63, the retention rate of elongation at break is greater than or equal to 485%, the retention rate of tensile strength after aging at 350 DEG C for 72 hours is greater than or equal to 86%, the thermal weight loss is 5%, the temperature is greater than or equal to 476 DEG C, the Mooney viscosity is less than or equal to 47, and the silicone rubber has excellent processability and high-temperature stability.

The invention belongs to the technical field of bionic cilium sensors, and particularly discloses a magnetic bionic cilium and vesicle complex and a preparation method and application thereof.The preparation method comprises the following steps that S1, a cilium array male mold is prepared; then carrying out oxygen plasma treatment, silanization and curing stabilization; s3, injecting the magnetic composite precursor into a polydimethylsiloxane female die, applying pressure, and striking off; and S4, coating the mold surface with an Ecoflex precursor, performing thermocuring forming, performing magnetization treatment, and performing stripping to obtain the magnetic bionic cilia. According to the magnetic bionic cilia, the vesicle complex and the preparation method and application of the magnetic bionic cilia, the vesicle complex and the preparation method and application of the magnetic bionic cilia, high-magnetic signal output is achieved while the deformability of the cilia is guaranteed, the magnetic bionic cilia is used for non-contact real-time hemodynamic monitoring, meanwhile, specific response release of the vesicle complex is achieved, and a new thought is provided for design of responsive vascular implants.

The invention discloses a preparation process of a flexible stretchable surface electromyographic motion sensing integrated electrode, and particularly relates to the field of flexible electronic technology and biomedical engineering.The electrode adopts thermoplastic polyurethane or polydimethylsiloxane as a substrate material, and conductivity and fatigue resistance are improved through doping of graphene quantum dots. The electrode comprises a myoelectricity sensing layer and a motion sensing layer, wherein the myoelectricity sensing layer is constructed through electrostatic spinning of a TPU nanofiber net and spraying of liquid metal, and the motion sensing layer forms a snakelike microcrack structure through silk-screen printing of a silver nanowire / TPU mixed material. The honeycomb-shaped insulating layer is used for isolating bimodal signals, and long-acting antibiosis and air permeability are achieved in combination with the self-repairing adhesion layer. After packaging, a Bluetooth 5.0 chip and a miniature lithium battery are integrated, and wireless signal transmission is supported.

The invention discloses a low-dynamic-static-stiffness-ratio polyurethane shock pad and a preparation method thereof, and relates to the technical field of polyurethane elastomers. The invention discloses a polyurethane shock pad with a low dynamic-static stiffness ratio. The polyurethane shock pad is prepared by mixing a component A, a component B and a component C, the component A comprises modified polyether glycol, blocked polyfunctional isocyanate, a catalyst, a plasticizer and an anti-aging agent; the component B is prepared from blocked polyfunctional isocyanate, diphenylmethane diisocyanate, modified polyether glycol and melamine; and the component C is a mixture of graphene oxide and bis (aminopropyl) polydimethylsiloxane. The component B is pre-polymerized in advance, so that the molecular structure of polyurethane is regular, and the prepared shock pad has better mechanical strength; through modification of polyether glycol and introduction of organic silicon, the shock pad keeps good elasticity at low temperature.

The invention relates to a micro-fluidic chip for chemiluminescence imaging detection of single-cell secretions and a use method of the micro-fluidic chip. The micro-fluidic chip is composed of a single cell analysis layer and a glass substrate layer. The single cell analysis layer is prepared from polydimethylsiloxane and is provided with a capture channel, a sample introduction channel and a lantern-shaped microstructure array, the lantern-shaped microstructure comprises a small-size cell capture trap and a large-size chemiluminescence detection chamber, the small-size cell capture trap is connected with the capture channel, and the large-size chemiluminescence detection chamber is connected with the sample introduction channel. After a mixed solution of cells and a detection reagent is introduced into the capture channel, single cell capture is realized on the capture trap due to flow resistance difference; then, introducing air into the capture channel and the sample introduction channel to form a gas-in-liquid microcavity, and carrying out single cell isolation and incubation reaction; finally, the signal switch molecules and the substrate liquid are sequentially injected into the chemiluminescence detection chamber through the sample injection channel, and quantitative detection is conducted on the single-cell secretions according to chemiluminescence imaging signals.

The invention relates to the field of printing ink, and particularly discloses water-based silk-screen printing oil, an applied water-based silk-screen printing protective film and a construction technology of the water-based silk-screen printing oil. The water-based silk-screen printing oil is prepared from the following raw materials: water, filler, a film-forming agent, polydimethylsiloxane dispersion liquid, polyamide wax, a polyether siloxane copolymer, an amine neutralizer and a resin matrix; the resin matrix is a mixture of water-based polycarbonate resin or water-based polyurethane resin and water-based soft polyurethane resin; the invention also discloses a water-based silk-screen protective film prepared from the water-based silk-screen ink through a silk-screen process, and also discloses a construction process of the water-based silk-screen protective film, and the construction process comprises the following steps: respectively preparing a primer and a finish paint; the preparation method comprises the following steps: respectively preparing a primer and a finish paint, mixing, carrying out silk-screen drying to form a primer layer, mixing the finish paint with a water-based high-temperature-resistant curing agent, and carrying out silk-screen to form a finish paint layer. The preparation method has the characteristic of preparing the environment-friendly high-temperature-resistant strippable water-based silk-screen printing ink.

The invention provides a preparation method of high-selectivity single-ended vinyl silicone oil, which comprises the following steps: adding a hydroxyl-terminated polydimethylsiloxane linear body into low-viscosity dimethyl silicone oil, uniformly mixing, adding linear phosphonitrile chloride for catalysis, and vacuumizing to remove water; continuously raising the temperature, adding a viscosity reduction catalyst, mixing a tetramethyl divinyl disiloxane double-end sealing agent, a dimethyl vinyl ethyoxyl silane single-end sealing agent and low-viscosity dimethyl silicone oil, dropwise adding the mixture into the reaction kettle, keeping the temperature, balancing, vacuumizing, and further removing water; then adding a hexamethyldisilazane neutralizing agent to carry out neutralization treatment; and after the neutralization is completed, entering a low-boiling-point removal process, carrying out reduced pressure distillation to remove low-boiling-point substances, and thus obtaining single-end vinyl polydimethylsiloxane. The single-ended vinyl silicone oil is applied to mold silica gel of liquid silicone rubber and can replace low-viscosity dimethyl silicone oil, the product hardness is adjusted, the oil seepage rate of the silicone oil is reduced, and the oil seepage phenomenon commonly existing in the industry is improved.

The application discloses a kind of flame-retardant mildew-proof prepolymer, transparent flame-retardant mildew-proof silicone sealant and preparation method thereof.The flame-retardant mildew-proof prepolymer is prepared from raw materials including the following components by weight: mildew-proof agent 0.5-10 parts, flame retardant 20-50 parts, tackifier composition 0.2-2 parts;The tackifier composition is composed of alkyl acetoacetate, trimethylsilyl ethyl acetate, 3-isocyanate propyl trimethoxysilane and polyether silicone oil.The transparent flame-retardant mildew-proof silicone sealant is prepared from raw materials including the following components: alkyl alkoxy-terminated polydimethylsiloxane, white carbon black, the flame-retardant mildew-proof prepolymer, crosslinking agent, catalyst, coupling agent.The transparent flame-retardant mildew-proof silicone sealant prepared by the application not only has very high transparency, but also has excellent flame-retardant effect, long-lasting mildew-resistant and antibacterial properties, and good bonding stability and mechanical strength.

The invention belongs to the field of hair cleaning agent preparation, and particularly relates to a functionalized hair cleaning agent and a preparation method thereof. The preparation method comprises the following specific steps: firstly, cutting stems and leaves of suaeda glauca into pieces, mixing the cut stems and leaves of suaeda glauca with ethanol, carrying out ultrasonic treatment twice, filtering, and concentrating to obtain a suaeda glauca extracting solution rich in antioxidant and anti-inflammatory components; secondly, traditional Chinese medicinal materials such as raw cacumen biotae and radix polygoni multiflori are soaked, heated and concentrated, and a conditioning concentrated solution for deeply conditioning hair is prepared; then, heating and stirring raw materials such as a surfactant and the like, then adding the conditioning concentrated solution, cooling, then sequentially adding guar gum, polydimethylsiloxane, phenoxyethanol and the like and the suaeda glauca extracting solution, adjusting the pH value to about 6, and stirring and defoaming to obtain the functional hair cleaning agent. According to the hair cleaning agent, multiple functions and high efficiency of the hair cleaning agent are achieved through fine design, the hair cleaning agent can nourish scalp and repair damaged hair, meanwhile, the hair cleaning agent is suitable for caring hair of human beings and pets, and the hair cleaning agent has remarkable advantages and wide market application prospects.

The application provides a silicone sealant not prone to discoloration and a preparation method thereof, and relates to the technical field of silicone sealants. The silicone sealant comprises the following components in parts by weight: 100 parts of hydroxyl-terminated polydimethylsiloxane, 70-130 parts of fillers, 0-20 parts of dimethyl silicone oil, 5-12 parts of a crosslinking agent, 1-3 parts of a coupling agent oligomer, 0.5-3 parts of an epoxy coupling agent and 0.01-0.5 parts of a catalyst. The application adopts a customized amino coupling agent oligomer with a specific structure, and optimizes the formula to achieve optimal effects by matching 107 glue, fillers and the like at a proper ratio. The application can improve the poor high-temperature tensile bonding property and the discoloration under high temperature of the existing silicone sealant, realizes good high-temperature bonding property and is not prone to discoloration, and in particular, the discoloration phenomenon under high-temperature application scenarios is obviously improved, thereby meeting the high requirements in special building, automobile, electronic and electrical applications and the like.

The application relates to a preparation method of a Zn-MOF derivative carbon-based super-hydrophobic wave-absorbing textile, which is prepared by immersing the textile in a mixed solution of silicone and Zn-MOF derivative carbon, and then sequentially performing padding, pre-drying and baking to obtain the Zn-MOF derivative carbon-based super-hydrophobic wave-absorbing textile; the silicone is hexadecyl trimethoxysilane, gamma-methacryloyloxypropyl trimethoxysilane, polydimethylsiloxane or polydimethylhydroxysiloxane; the Zn-MOF derivative carbon has a regular polyhedral structure and a diameter of 50-500 nm; the minimum reflection loss of the Zn-MOF derivative carbon is-20 to-50 dB; the water contact angle of the Zn-MOF derivative carbon-based super-hydrophobic wave-absorbing textile is not lower than 150.7 degrees, and the minimum reflection loss is not higher than-21.2 dB; the preparation method is simple, and the prepared product has super-hydrophobic and wave-absorbing properties.

This invention belongs to the field of catalyst technology, and discloses a high-efficiency platinum catalyst, its preparation method, and its application. The preparation of the high-efficiency platinum catalyst of this invention includes mixing and stirring a Karstedt catalyst, a ligand, and a catalyst, adding vinyl-terminated polydimethylsiloxane, and fully dissolving it to obtain the high-efficiency platinum catalyst. The obtained catalyst is used to prepare filler-free flame-retardant silicone rubber, which comprises the following raw materials in parts by weight: 80-100 parts vinyl-terminated polydimethylsiloxane, 2-4 parts crosslinking agent, 2-10 parts of the high-efficiency platinum catalyst of this invention, and 0.2-0.3 parts polymerization inhibitor. This invention provides a novel modified platinum catalyst for silicone rubber, which enhances the anti-sintering properties of Pt at high temperatures through the nitrogen-containing carbene ring and the Pt ligand, thereby improving the flame-retardant properties of silicone rubber brought by the platinum catalyst.

This application discloses an organosilicon composite membrane doped with Zn and Co bimetallic organic frameworks, its preparation method and application, including the steps: Zn / Co-ZIF Under electric stirring, Zn(COOCH3)2 and Co(COOCH3)2·4H2O are dissolved in N,N-dimethylformamide solution to obtain solution A; 2,5-dihydroxyterephthalic acid is dissolved in N,N-dimethylformamide solution to obtain solution B; salicylic acid is dissolved in N,N-dimethylformamide solution to obtain solution C; when the solution is stirred until clear, solution A is slowly added dropwise to solution B, and then solution C is added dropwise thereto, and stirring is continued, and then left to stand, and the supernatant is discarded, and the precipitate is centrifuged and washed with N,N-dimethylformamide and methanol respectively; the cleaned product is dispersed in methanol, and the product is centrifuged and washed with methanol, and then activated to obtain ZnCo-ZIF; the dried Zn / CO-ZIF is dispersed in polydimethylsiloxane coating solution to form a coating solution to be coated; the coating solution to be coated is cured on a polyvinylidene fluoride substrate membrane to prepare an organosilicon composite membrane for highly separating CO2 / N2 gas.

The invention discloses a high-flexibility stretchable clustered gold nano array film and a preparation method and application thereof. The high-flexibility stretchable clustered gold nano array film comprises an elastic flexible substrate modified with an amino functional group and gold nanowires vertically arranged on the surface of the elastic flexible substrate in a one-dimensional mode. The one-dimensional gold nanowires are of a cluster array structure formed by multi-branch gold nanostar induced self-growth, and the arrangement direction is perpendicular to the surface of the substrate. The preparation method comprises the following steps: oxidizing the surface of the polydimethylsiloxane substrate to generate hydroxyl; the treated polydimethylsiloxane substrate is immersed in a 3-aminopropyl triethoxy silane solution, and then the polydimethylsiloxane substrate and the 3-aminopropyl triethoxy silane solution are subjected to ultrasonic treatment; ligand-free gold nanostars synthesized by adopting a seed mediation method are attached to the surface of polydimethylsiloxane under the action of Au-N covalent bonds; placing the polydimethylsiloxane film modified by the gold nanostars in a growth solution to induce growth of the gold nanowires so as to form a cluster array; cleaning and drying to obtain a final film; when the prepared cluster-shaped gold nano array film is applied to a sensor, capturing of tiny physiological signals can be achieved.

The invention discloses a double-component room-temperature curing acetone-removing type organic silicon sealant and a preparation method thereof, and belongs to the technical field of polymer sealing materials, the sealant comprises a component A and a component B. The component A comprises alpha, omega dihydroxy polydimethylsiloxane, an acid-resistant reinforcing filler and a thixotropic filler, and the component B comprises a component A and a component B. The component A comprises alpha, omega dihydroxy polydimethylsiloxane, an acid-resistant reinforcing filler and a thixotropic filler. The component B comprises alkoxy-terminated polydimethylsiloxane, an acid-resistant reinforcing filler, a thixotropic filler, a heat-resistant filler, carbon black, a deacetonized cross-linking agent, a silane coupling agent and a catalyst. In particular, the invention also provides a preparation method of the alkoxy-terminated polydimethylsiloxane. The heat resistance of a deacetone silica gel system with excellent heat resistance is further improved and optimized, meanwhile, the requirements for rapid curing and attractive appearance of the microwave oven glue are met, the mixing volume ratio of the two components is 1: 1 during use, the requirement for equipment metering precision is low, and automatic equipment gluing of a gluing robot is facilitated.

A pixel array and a method of manufacturing the same, the pixel array including a pixel sensor and a polydimethylsiloxane layer over the pixel sensor, wherein a surface of the polydimethylsiloxane layer includes a plurality of structures, each structure having an individual width that is less than a wavelength of an incident light to be sensed by the pixel sensor.

The invention relates to a multi-concentration flow-rate-controllable micro-fluidic chip for zebra fish preference behavior analysis. The micro-fluidic chip comprises a glass base layer and a polydimethylsiloxane layer, wherein the upper part of the polydimethylsiloxane layer contains an integrated chip structure. The chip structure comprises a first chip for controlling concentration gradient, a second chip for realizing dynamic regulation and control of flow velocity and a third chip for observing zebra fish behaviors, and the three chips are connected in sequence to analyze zebra fish preference behaviors. According to the invention, a three-chip integrated design is adopted, and the first chip generates fluids with various concentrations by using a concentration gradient generator with uniform hierarchy distribution; the second chip is provided with a permanent magnet in a fluid channel, an equal-flow-resistance path is constructed, and path switching and the flow proportion of fluid with different concentrations are adjusted to control the flow speed; the symmetrical cavity structure of the third chip enables the concentration-flow velocity combined fluid to be uniformly distributed, and a multi-region environment gradient is formed. The design overcomes the limitation of single regulation and control in the prior art, can cooperatively regulate and control the concentration and the flow velocity, simulates a multi-factor coupling scene, and expands the zebra fish preference behavior research dimension and reliability.