5354 results about "Silicon rubber" patented technology

The invention discloses a polyurethane/silicon rubber thermoplastic elastomer and a preparation method thereof, and provides a polyurethane/silicon rubber thermoplastic elastomer which can be repeatedly processed and has good mechanical property and fine heat and oil resistance and a preparation method thereof. The elastomer is composed of polyurethane, silicon rubber, a cross-linking agent, a catalyst and a compatilizer. The preparation method comprises the following steps: adding the polyurethane into a blending device from an intermixing machine or a two-screw extruder at the blending temperature of 160-200 DEG C, then adding the silicon rubber and the compatilizer to blend for 3-4 minutes, then adding the cross-linking agent, and finally, adding the catalyst; and reacting and blending for 6-7 minutes so as to obtain the dynamically vulcanized polyurethane/silicon rubber thermoplastic elastomer with high performance. Compared with other types of thermoplastic elastomers, the polyurethane/silicon rubber thermoplastic elastomer has the advantages of fine heat resistance, wear resistance and mechanical property and good hand feel, and can be widely applied to the fields of automobiles, buildings, medical instruments, cables and the like.

The invention discloses a rotary opening type pressure cooker provided with a timer. The pressure cooker comprises a cooker body, a pressure cap, a cap lug, cooker lugs and a silicon rubber seal ring arranged between the edge of the pressure cap and the upper edge of the cooker body, wherein the pressure cap comprises a cooker cap assembly, a vent valve arranged on the cooker cap assembly, a pair of stainless steel lock ring assemblies hooping a pair of side edges of the pressure cap and a control mechanism for controlling the stainless steel lock ring assemblies to tightly lock the pressure cap and the upper edge of the cooker body, and a timer assembly is detachably mounted on the pressure cap. The detachable timer used in the cooker adopts embedded design and hardly occupies additional space, the timer is highly integrated with the pressure cooker, and the awkward condition that a timer storage position is forgotten is avoided; the timer can be taken down for independent use, and waiting by side of the cooker is not needed; a buzzer alarm can remind a user of turning off the cooker, and trouble in battery replacement can be avoided by means of design of a charge jack.

PCT No. PCT/JP98/03304 Sec. 371 Date Mar. 25, 1999 Sec. 102(e) Date Mar. 25, 1999 PCT Filed Jul. 24, 1998 PCT Pub. No. WO99/06457 PCT Pub. Date Feb. 11, 1999There is provided graft copolymer particles prepared by graft-polymerizing a vinyl monomer to a coagglomerated rubber, wherein said rubber is prepared by coagglomerating rubber particles of mixed latexes obtained by mixing (A) a silicone rubber latex with (B) an acrylic rubber latex and/or a conjugated diene rubber latex in such an amount as a silicone content is from 1 to 90% by weight based on the total rubber component. A physical property of a thermoplastic resin is improved using the graft copolymer particles. The thermoplastic resin composition using the graft copolymer particles is excellent in impact resistance, weather resistance, processability, thermal discoloration resistance and appearance of molded products.

To provide a dental impression material composition having high hydrophilicity comparable to that of polyether rubber-made impression materials, being superior in recovery from deformation caused by removal out of an oral cavity, which are similar to silicone rubber-made impression materials, the dental impression material composition being superior in dimensional precision, and good in storage stability. The dental impression material composition includes (A) 100 parts by weight of the sum of (1) an organopolysiloxane containing at least two aliphatic unsaturated hydrocarbons in one molecule and (2) a polyether containing at least one aliphatic unsaturated hydrocarbon in one molecule, in a weight ratio of (1) to (2) of 1:0.01˜1:5, having (B) 0.1˜100 parts by weight of an organohydrogenpolysiloxane containing at least three hydrogen atoms directly bonded to a silicon atom in one molecule, (C) 10˜500 ppm, based on the sum of (A) and (B), of a silicone-soluble platinum compound, (D) 10˜800 parts by weight of an inorganic filler, and (E) 0.5˜5 parts by weight of a nonionic surfactant and/or a polyether-modified silicone oil, compounded therewith.

The invention provides an oriented flexible heat conduction material. Main components of the oriented flexible heat conduction material are silicon rubber and anisotropism heat conduction packing. A plurality of heat conduction paths which are parallel to each other and continuous are formed in the oriented flexible heat conduction material by linearly and continuously arranging the anisotropism heat conduction packing filled in the silicon rubber in heat conduction path directions. The oriented flexible heat conduction material has good heat conduction property in a particular direction and good flexibility, can form good contact with an interface, is low in interface resistance and can be used for improving a heat dissipation effect very well. The embodiment of the invention also provides a forming technology and an application of the oriented flexible heat conduction material.

The invention relates to a growth factor slow-release type double-layered artificial skin which is used for repairing injured skin with related growth factor slow-release functions and a preparation method thereof. The artificial skin is divided into two layers of an epidermal layer and an enderonic layer, wherein the epidermal layer is constituted by a micropore double-layered thin film with the functions of water proofing, ventilation and enderonic protection; the materials of the upper layer which contacts with air is polyurethane, or silicon rubber, or polyethylene glycol, or ethylene terephthalate and other medical materials; the lower layer which contacts with the dermis is a natural biological macromolecule thin film which is constructed by silk fibroin and chitosan; the enderonic layer of the artificial skin is constituted by collagen, polysaccharide and microspheres carrying growth factors related to skin regeneration and repairing; the microspheres have good slow-release function, and the slow-release period is equal to or slightly longer than the degradation period of the collagen and polysaccharide and can be matched with the skin regeneration and repairing period; and the thickness of the artificial skin is in a range of 0.5-1.5mm and can be regulated according to requirements.

An intubating LMA construction features a rigid airway tube wherein curvature in a single plane establishes essentially an arcuate path of angular extent in the preferred range of 130°, plus or minus 5°, which I have found to be in substantial anatomical conformance with the adult human's airway path, between a proximal end of the arc at substantial register with the longitudinal midpoint of the hard palate, and a distal end that faces and is at short offset from the glottic aperture, it being understood that my findings apply to suitably quantified allowance for variations in patient-head anatomy, as is for example customary for different sizes of LMA devices, each of which is adapted to serve one of five selected patient-size ranges. The proximal end of the rigid tube is suitably a short straight portion which is tangentially and integrally related to the proximal end of the arc. And the distal end of the arc is fitted with flexible mask structure of preferably elastomeric material such as silicone rubber, wherein an internal ramp formation within the mask structure assures a limited but important measure of further and stabilized guidance of an ET which has emerged from the distal end of the rigid tube, such that unguided displacement of the ET (i.e., beyond the ramp) is oriented to target safe entry of the ET into the glottic opening.

The invention provides a multi-dimensional parameter assessment method of an aging degree of a running composite insulator. The method comprises the following steps: firstly measuring hardness, hydrophobicity, a surface defect area, an infrared absorption peak corresponding to a Si-O-Si group, a trap charge amount and a flashover voltage of a high-temperature vulcanized silicone rubber test sample of an umbrella skirt of a target composite insulator; then performing quantitative processing on the measured data, and scoring the aging degrees of the processed feature parameters; performing weighted summation on the scores of the feature parameters to obtain a comprehensive feature parameter characterizing the aging degree of the composite insulator; and finally determining the aging degree of the insulator according to a corresponding relation between the size of the comprehensive feature parameter and the grade of the aging degree. According to the multi-dimensional parameter assessment method provided by the invention, the microscopic electrical characteristics and microscopic physical and chemical characteristics of the umbrella skirt material of the composite insulator are combined with macroscopic characteristics to realize the comprehensive assessment of the aging degree of the composite insulator. By adoption of the method, the one-sidedness of the traditional assessment method is avoided, and thus the accuracy of an assessment result is guaranteed.

An acceleration sensor in which a regulation plate is fixed with adhesive onto a support frame of a sensor chip of the sensor to limit the movement of a mass portion of the sensor chip within a predetermined gap range. In the acceleration sensor, the adhesion area of the adhesive can be controlled to a predetermined value to prevent a variation of the sensitivity due to the variation of the adhesion area. The sensor chip comprises the mass portion, the frame surrounding the mass portion and having on an upper surface of the frame a plurality of the recesses to fill adhesive into, elastic support arms bridging the mass portion and the frame, and strain gauges formed on the elastic support arms. The regulation plate is fixed with paste onto the frame with the predetermined gap with an upper surface of the mass portion. The paste contains hard plastic balls, of a diameter larger than the predetermined gap, mixed with adhesive. The adhesive is preferably of silicon-rubber resin.

The invention belongs to the technical field of thermal protection special composite materials, and in particular relates to a silicone rubber based ablation-resisting heat insulation composite material and a preparation method thereof. The silicone rubber based ablation-resisting heat insulation composite material comprises the following components in parts by mass: 100 parts of silicone rubber, 5-30 parts of ablation-resisting fiber, 10-80 parts of white carbon black, 0.5-10 parts of a structural control agent, 5-50 parts of ceramization powder, 1-30 parts of carbide, 2-20 parts of a coupling agent and 0.5-15 parts of a vulcanizing agent. The preparation method comprises the following steps: firstly, preparing materials according to the above components, mixing on a double-roller opening mixing machine to form pieces, and further performing vulcanization, thereby obtaining the silicone rubber based ablation-resisting heat insulation composite material. The strength and the density of a carbonized layer of the silicone rubber based ablation-resisting heat insulation composite material are improved, the ablation resistance and the oxidation resistance of the silicone rubber based ablation-resisting heat insulation composite material are improved, and the requirement that the rapider the speed of a spacecraft is, the higher the effective load is in the future can be met.

The invention relates to a material used for a halogen-free, flame retardant and thermal shrinkage sleeve and crosslinked wires and cables as well as the preparation method, aiming to provide a material and the preparation preparation method for halogen-free, flame retardant and thermal shrinkage sleeve and crosslinked wires and cables in diversified colors. The preparation method comprises the following steps: first, evenly mixing the compound formed by polyolefin copolymer, silicon rubber, halogen-free ammonium polyphosphate composite fire retardant, lubricant, colorant color master batch and antioxidant in specific proportions through a high speed mixer, then extruding and granulating the compound by means of the mechanical blending, finally turning out the material for producing the halogen-free flame retardant and thermal shrinkage sleeve and crosslinked wires and cables.

The invention belongs to the field of liquid silicone rubber, and particularly relates to single-component heat-curing liquid silicone rubber and a preparation method thereof. Ethenyl polysiloxane is used as base rubber, hydrogen polysiloxane is used as a cross-linking agent, a complex of transition metal platinum is used as a catalyst, an alkynol mixture is used as an efficient polymerization inhibitor, aluminum oxide and aluminium nitride are used as heat conductive fillers, a silane coupling agent is used as a tackifier, aluminium hydroxide is used as a fire retardant, and fumed silica is used as a reinforcing agent. As a process is strictly controlled, and a process route that raw materials are treated and dried in advance, and mixed at room temperature to prepare the rubber is adopted, the low-viscosity single-component heat-curing silicone rubber is prepared. The fire retardant single-component heat-curing liquid silicone rubber can be stored for a long term at normal temperature, is low in viscosity, single in component, good in heat conductivity and temperature tolerance, and good in adhesion with a base material.

The invention relates to a high-temperature resistant and erosion resistant rubber composition and a preparation method thereof. The high-temperature resistant and erosion resistant rubber composition is prepared by using the following components: 100 parts of silicon rubber, 5-30 parts of silicon dioxide, 5-50 parts of metallic oxide, 1-25 parts of nitride ceramic fibre, 0.5-20 parts of silicon carbide whisker, 20-100 parts of heat resistant packing, 0.01-0.5 parts of catalyst and 0-4 parts of cross-linking agent through double-roll milling, hot-pressing, vulcanizing and molding.

The invention provides a silicon rubber cross-linked flame-retardant cable material. The cable material is prepared from the following raw materials, by weight, 100 parts of silicon rubber, 20-30 parts of ethylene propylene diene monomer, 8-10 parts of chlorinated polyethylene, 15-20 parts of acetylene black, 0.5-1.0 part of dimethyl silicone oil, 0.2-0.5 parts of dicumyl peroxide (DCP), 20-30 parts of high-density polyethylene, 15-25 parts of calcium silicate, 0.5-1.0 part of modified argil, 30-40 parts of precipitated silica, 1-3 parts of a silane coupling agent, 0.2-0.5 parts of an antioxidant 4040, 0.5-1.5 parts of a promoter TMTD, 0.2-0.5 parts of a vulcanizing agent BP, 2-4 parts of tribasic lead sulfate, 12-15 parts of antimony (III) oxide, and 6-8 parts of zinc borate. The cable material has the advantages of excellent flame retardation, very less smoke in combustion, no generation of toxic gases or corrosive gases, good high and low temperature resistances, good corrosion resistance, good water resistance, good ozone resistance, and good ageing resistance.

A golf glove for increasing the flying distance of golf ball has an insert that provide a repulsion forces to the grip of a golf club when the head of the club impacts a golf ball. The insert is made of synthetic elastomer such as polyurethane, silicon rubber, EVA (Ethylene Vinyl Acetate copolymer, EMA (Ethylene Methyl Acetate copolymer), or EAA (Ethylene Acrylic Acetate copolymer). The insert has a planar shape that fits to the concave inner surface of human palm. The insert is firmly attached to the inner surface of the palm side of a golf glove.

The present invention is a cell phone holder and transmitter that is compact in size and is small and light in weight whereby it is capable of being clipped onto a holder attachment in a vehicle by a mounting clip and a gooseneck with affixed clip at the end. The holder of the cell phone itself also acts as the transmitter thereby minimizing the size and dimensions of the present invention. The present invention is capable of transmitting from an MP3 device, I-Pod or other media player. The present invention is also compatible with other devices utilizing a standard 3.5 mm audio output source. The present invention utilizes mounting surfaces composed of silicon rubber embedded in fluoride. Said combination of materials allows the formation of a secure seal for a cell phone while resting within the present invention and said material additionally allows a user to place and remove a cell phone of varying dimensions with minimum effort. A co-axial microphone wire cable of the present invention serves as a Frequency Modulation (FM) transmitter antenna. Said speaker and microphone wire cable antenna is composed of a copper alloy material to further its utility as an antenna. Said Transmitter sends signals to the FM band. Said FM band transmission is of a frequency at or between 88.1 and 88.9. Said present invention operates on less than 1 watt of output.

A dual-layer scaffold for the skin regeneration is composed of a porous collagen-chitosan scaffold for inducing the migration, reproduction and differentiation of cells and the generation of dermal tissue and a silica rubber film as temporary epidermal layer for preventing the volatilization of water and the intrusion of bacteria. It has high biocompatibility, controllable degradation speed and excellent wound repairing power.

The invention discloses a comprehensive permeability testing machine for measuring vertical permeability coefficient and horizontal permeability coefficient. The invention comprises a constant-pressure water tank which is communicated with two water supply pipes, wherein, one water supply pipe is communicated with an upper pressure chamber; the top of the upper pressure chamber is provided with a barometer and an air-bleed hole and the side face of the upper pressure chamber is provided with an inflating device; the upper pressure chamber is communicated with a lower pressure chamber through an assembly member; the upper part of the lower pressure chamber is provided with a bubble exhaust hole and the lower part of the lower pressure chamber is communicated with a graduated flask through an exhaust pipe and a metered valve; the other water supply pipe is connected to the left of the assembly member; and the assembly member is communicated with the graduated flask through the exhaust pipe and the metered valve and consists of an impervious membrane, silicon rubber, a V-shaped slot board and a pressurized plastic membrane. The comprehensive permeability testing machine has the advantages that: firstly, the pressurized plastic membrane can quickly, precisely and uniformly transfer normal pressure to a sample, and the impervious membrane can prevent leakage of the sidewall; secondly, water flow is uniformly infiltrated into the V-shaped slot; thirdly, due to arrangement of the silicon rubber, the border effect is reduced; fourthly, the whole machine realizes measurement of the vertical permeability coefficient and the horizontal permeability coefficient, and is precise, simple and clean, highly efficient, practical and convenient to operate.

The invention relates to a high oil absorption polyurethane foam which comprises the following components in parts by weight: 20 to 40 parts of isocyanate, 35 to 60 parts of polyol, 0.5 to 3 parts of catalyst, 0.5 to 3 parts of foam stabilizer, 5 to 10 parts of foaming agent, 2 to 10 parts of opening agent,5 to 20 parts of flame retardant, 5 to 15 parts of silicon rubber spherical micro powder and 0.5 to 2 parts of coupling agent. The preparation method comprises the following technology steps of weighing, prepolymerization, dispersing, polymerization foaming reaction, curing and peeling at room temperature and cutting. The high oil absorption polyurethane foam can be used for the absorption and recycle of various oil products (crude oil, engine oil, diesel fuel, gasoline, kerosene and the like) on water surfaces, ground or surfaces of other objects, and various oil soluble organic compounds (benzene, methylbenzene, dimethylbenzene, chloroform, nitrobenzene, chlorobenzene and the like). The invention has the advantages of simple technology and low cost, obviously improves the dispersing effect of the silicon rubber spherical micro powder in a polymerization system by using ultrasonic technique, and greatly increase the oil absorption quantity and oil absorption rate of the polyurethane foam by adding the silicon rubber spherical micro powder.

The invention discloses a radiation-resistant halogen-free low smoke flame retardant insulating material for cables of nuclear power plants and a preparation method. The radiation-resistant halogen-free low smoke flame retardant insulating material is prepared from the following raw materials: ethylene propylene diene rubber, phenyl siloxane rubber, magnesium hydrate, aluminium hydroxide, zinc borate, white carbon black, cerium dioxide, zinc oxide, Bis(tert-butyldioxyisopropyl)benzene, tri allyl cyanurate, 2-mercaptobenzimidazole, 2,2,4-trimethyl-1,2-dihydroquinoline, Aflux A-25, stearic acid, vinyl tris(beta-methoxyethoxy) silane, and paraffin oil by heating and mixing. The formulation and the mixture ratio are scientific and reasonable, and the process is advanced. The prepared insulating material has good radiation resistance, excellent mechanical property, good electrical property and long service life, and is a good radiation-resistant halogen-free low smoke flame retardant insulating material for manufacturing the cables of the nuclear power plants.

An evaluation method of the aging degree of an operational composite insulator comprises the steps of firstly utilizing a three-electrode volume resistivity test device to measure the volume resistivity of a round-slice high-temperature silicon sulfide rubber sampler which is cut from the surface of the net-hanging operational composite insulator at different temperatures, plotting a curve, calculating the linear fitting R2 of the curve, and finally comprehensively determining the aging degree of the composite insulator according to the change situation of the linear fitting R2 of the curve and the volume resistivity of the round-slice high-temperature silicon sulfide rubber sampler. According to the present invention, the aging degree of the composite insulator is determined comprehensively according to the change situation of the linear fitting R2 of the curve and the volume resistivity of the round-slice high-temperature silicon sulfide rubber sampler, so that the operation is simple and convenient, and the accuracy of the evaluation result is improved, and accordingly, the reliable operation of a high voltage power transmission line is guaranteed.

The invention provides a heat conduction silicon rubber composite material, a heat conduction silicon sheet and a preparation method of the heat conduction silicon sheet. The heat conduction silicon rubber composite material comprises the following components in parts by weight: 5-40 parts of methyl vinyl silicon rubber, 15-50 parts of organic silicon oil, 0.5-2 parts of silane coupling agent, 0.01-0.1 part of platinum catalyst, 10-20 parts of photo-curing adhesive and 50-400 parts of heat conduction powder. The heat conduction silicon rubber composite material comprises the photo-curing adhesive. After the heat conduction silicon rubber composite material provided by the invention is prepared into a heat conduction silicon sheet semi-finished product, the viscosities of the two surfaces of the obtained heat conduction silicon sheet are different due to difference of the ultraviolet irradiation time of the upper and lower surfaces of the heat conduction silicon sheet and the heat conduction silicon sheet with different surface attributes is obtained, so that the heat conduction silicon sheet provided by the invention can meet various special requirements and is beneficial to application.