392 results about "Neoprene" patented technology

The invention discloses an anti-aging water-stop belt and a preparation method and application thereof, and relates to the technical field of water-stop belts. The invention relates to an anti-aging water-stop belt which is prepared from the following raw materials in parts by mass: 40-60 parts of chloroprene rubber, 10-20 parts of natural rubber, 10-20 parts of ethylene propylene diene monomer, 15-30 parts of carbon black, 5-15 parts of white carbon black, 5-15 parts of a plasticizer, 0.5-2 parts of sulfur, 0.5-1.5 parts of an accelerant, 1-2 parts of an anti-aging ultraviolet light absorber, 5-15 parts of aluminum hydroxide, 1-3 parts of stearic acid and 3-8 parts of zinc oxide. The obtained water-stop belt has excellent ultraviolet aging resistance, ozone resistance and chemical corrosion resistance while keeping high elasticity, the mechanical stability of the water-stop belt is remarkably improved compared with that of a traditional product, the water-stop belt is suitable for joint sealing in harsh environments such as bridges, tunnels and water conservancy projects, and the waterproof service life of engineering structures can be effectively prolonged.

The invention relates to the field of multifunctional coatings, in particular to a multifunctional coating based on acrylic resin and a production process of the multifunctional coating. Comprising the following raw materials in parts by weight: 40-60 parts of water-based acrylic resin emulsion, 0.3-0.6 part of a defoaming agent, 3-5 parts of modified nano hydroxyapatite, 0.3-0.5 part of a flatting agent, 2-5 parts of a dispersing agent, 1-3 parts of a curing agent, 3-5 parts of modified nano aluminum oxide and 30-50 parts of deionized water. The grafted chloroprene rubber can improve the interfacial compatibility of the nano-hydroxyapatite and a matrix and endows the coating with wear resistance, and after the nano-alumina is grafted with polybenzimidazole, a benzimidazole ring interacts with the matrix to enhance the interfacial compatibility of the nano-alumina and the matrix, so that the nano-alumina forms a high-temperature-resistant structure in the coating, and the wear resistance of the coating is improved. And the aromatic heterocyclic structure of the polybenzimidazole can endow the coating with higher thermal decomposition temperature, so that the coating has high temperature resistance.

An improved Type C air conditioning hose is provided that meets or exceeds SAE J2064 and J3062 requirements, offers good flexibility and fracture resistance, and exhibits improved permeation ratings for refrigerants including R134a and R1234yf. The multilayer type C barrier air conditioning hose includes an inner elastomeric tube layer capable of direct bonding to plastic without an intervening adhesive. The inner elastomeric layer is prepared from a first elastomeric composition comprising a blend of an ethylene propylene diene terpolymer rubber (EPDM) and a chloroprene rubber (CR), phenylenedimaleimide, and a maleated compound.

The invention provides an anti-extrusion cable and a cable connection structure, and relates to the technical field of cables.The anti-extrusion cable comprises a cable body, the cable body comprises a middle sheath, a shielding layer, a plurality of guide cores, a filling layer and an inner insulating sheath, the guide cores are evenly arranged on the inner side of the middle sheath, and the shielding layer is arranged on the inner side of the middle sheath; the guide cores, the inner insulating sheaths and the shielding layers are arranged in a one-to-one correspondence manner, the inner insulating sheaths tightly wrap the outer sides of the guide cores, the shielding layers tightly wrap the outer sides of the inner insulating sheaths, and the filling layers are filled in gaps between the shielding layers and the middle sheath; a middle sheath of a cable main body is made of chloroprene rubber materials and provides stable support for an internal structure, a spiral spring steel wire fixedly sleeved on the outer side of the middle sheath can effectively disperse external extrusion acting force and improve the overall anti-extrusion performance of the cable, and a silicone rubber layer coated on the outer side of the steel wire is tightly attached to the steel wire and extends to the outer wall of the middle sheath to be in hot melting connection, so that the service life of the cable is prolonged. And extrusion impact can be buffered in an auxiliary manner.

The present disclosure provides a tray table assembly including a pouch configured to temporarily stow travel essentials during flight. The pouch is removably attached to the back of the tray table by way of a plurality of removable fasteners. The pouch includes inner and outer layers forming an interior space therebetween accessible through a top opening that may be zippered or otherwise closeable. In some embodiments, the pouch is constructed from soft material such as neoprene rubber, and at least the outer layer is made from mesh or translucent material such that the contents are visible to the passenger, so they are not forgotten and left behind.

The invention provides an industrial dehydration device and system for powdery chloroprene rubber, and belongs to the technical field of rubber dehydration. The industrial dehydration device for powdery chloroprene rubber comprises a box body and a tank body, the tank body is installed on the surface of the box body, a primary dehydration mechanism is installed on the surface of the tank body and used for carrying out primary dehydration on rubber, the primary dehydration mechanism comprises a filter cartridge, a first rotating shaft and a centrifugal disc, and the filter cartridge is rotatably installed in an inner cavity of the tank body. According to the rubber dewatering device, the primary dewatering mechanism is arranged, a first motor drives a first rotating shaft to rotate, a centrifugal disc can be driven to rotate synchronously through spline teeth and spline grooves, and under meshing of a first gear ring and a tooth groove, a filter cartridge is driven to rotate synchronously to conduct centrifugal dewatering on rubber; the second gear drives the first gear and the material dispersing blade to rotate reversely, so that rubber fed from the feeding bin is smashed to the inner wall of the filter cartridge reversely, accumulation of the rubber is avoided, and meanwhile, the dehydration effect is improved.

This invention relates to the field of sealing ring technology, and proposes an aging-resistant rubber sealing ring and its preparation method. An aging-resistant rubber sealing ring comprises the following components in parts by weight: 70-80 parts of nitrile rubber, 20-25 parts of chloroprene rubber, 20-30 parts of filler, 3-4 parts of activator, 1-2 parts of co-activator, 2-3 parts of antioxidant, 4-8 parts of plasticizer, 2-3 parts of crosslinking agent, and 1-2 parts of accelerator; the filler includes modified carbon nanotubes and nylon 66 fiber; the preparation method of modified carbon nanotubes includes the following steps: A1, adding carbon nanotubes to mixed acid, soaking, filtering, and drying to obtain pretreated carbon nanotubes; A2, adding the pretreated carbon nanotubes and methyl cyanobenzoate to ethyl acetate, stirring, concentrating, and drying to obtain modified carbon nanotubes. Through the above technical solution, the problem of poor aging resistance of rubber sealing rings in related technologies is solved.

The invention discloses a weather-resistant insulating overhead cable, which relates to the technical field of cables, comprises a cable mechanism, and is characterized in that the cable mechanism comprises conductors, an insulating layer, an inner sheath layer and a steel tape armor; according to the invention, the inner sheath layer and the steel tape armoring are arranged at the outer side of the conductor in a layered manner, the inner sheath layer adopts chloroprene rubber as a main raw material, the chloroprene rubber has excellent weather resistance, ozone resistance, chemical corrosion resistance and flame retardance, and carbon black can enhance the wear resistance and tear resistance of the inner sheath layer and improve the weather resistance of the inner sheath layer at the same time; the anti-aging agent can effectively delay the aging speed of the inner sheath layer, the plasticizer improves the flexibility and processability of the chloroprene rubber, the inner sheath layer wraps the shielding layer and further protects the inner insulating layer and the shielding layer, the good weather resistance of the inner sheath layer can resist erosion of the external environment to the internal structure, and the inner sheath layer and the outer insulating layer act synergistically, so that the service life of the cable is prolonged. And the overall weather resistance of the cable is enhanced.

The invention belongs to the technical field of preparation of chloroprene rubber, and provides bio-based plasticizer modified chloroprene rubber and a preparation method thereof. The bio-based plasticizer is chlorinated palm oil methyl ester and is prepared by mixing chloroprene rubber, carbon black, chlorinated palm oil methyl ester, an anti-aging agent, zinc oxide, magnesium oxide, stearic acid and an accelerant according to a certain proportion. A proper amount of chlorinated palm oil methyl ester is added, so that the flexibility and cold resistance of the chloroprene rubber are effectively improved, and the chloroprene rubber still can keep relatively good elasticity and use performance in a low-temperature environment. The environment protection and the re-biochemistry of the plasticizer are realized, the dependence on non-renewable resources is reduced, and the potential harm to the environment is reduced. And the original good physical and mechanical properties, such as tensile strength, of the chloroprene rubber are maintained. Conventional rubber processing equipment and process are adopted, operation is easy, control is easy, the method is suitable for industrial production, and good application prospects and economic benefits are achieved.

A hypothermia insulative cap is provided enhanced with a GPS-enabled LED strip for emergencies, constructed from dual-layer nylon and neoprene with advanced seam technologies for durability and comfort. It features a unique technology chassis for waterproofing essential electronics, a battery-activated GPS and LED for increased visibility, and a protective brow visor for comfort and protection. This cap is designed to maintain body temperature during waterborne rescues, offering increased visibility to rescuers and compatibility with conventional life vests, without impeding the function of either device.

The invention relates to the technical field of rubber hoses, in particular to a pressure-resistant and oil-resistant rubber hose and a preparation method thereof.The preparation method comprises the following steps that S1, nitrile rubber, chloroprene rubber, chlorosulfonated polyethylene, chlorinated polyethylene, sulfur, an accelerant and an anti-aging agent are added into an internal mixer to be evenly mixed, the temperature is controlled for mixing, sheet discharging is conducted, a pipe blank is extruded through an extruder, and the pipe blank is obtained; a combined rubber layer is obtained; s2, the combined rubber layer, the woven copper-plated steel wire layer, the reinforcing layer, the spiral zinc-plated spring steel wire layer, the reinforcing layer, the woven copper-plated steel wire layer and the combined rubber layer are subjected to interlayer bonding in sequence, and the assembled hose is obtained; and S3, the assembled hose is put into a vulcanizing tank to be subjected to vulcanizing treatment. By adopting the seven-layer composite structure design, the rubber hose disclosed by the invention can be in contact with a strong corrosive medium for a long time without internal corrosion, so that the service life of the hose is prolonged, and the safety of the hose in the use process is also improved.

The application relates to the field of chemical-proof fabrics, and particularly discloses a flame-retardant chemical-proof fabric and a preparation process thereof. The flame-retardant chemical-proof fabric comprises, from outside to inside, an outer layer, a bonding layer, a framework layer, a bonding layer and an inner layer which are sequentially contacted, the outer layer is a barrier layer, the inner layer is a barrier layer or an adsorption layer, the framework layer is selected from at least one of a composite fabric of aramid fiber / polyimide fiber, a basalt fiber cloth, a glass fiber cloth, a flame-retardant polyester cloth and a flame-retardant acrylic fiber cloth, the barrier layer is selected from at least one of a PVC / TPU composite film, a PVC film, a PTFE film, a PE film, silicone rubber, fluororubber, butyl rubber, chloroprene rubber and natural rubber, and the adsorption layer comprises a mixed fabric layer formed by nylon fiber and polyester fiber containing an adsorption material. The flame-retardant protective fabric has the advantages of high flame-retardant capacity, good chemical-proof effect, excellent puncture resistance and tensile resistance, can absorb moisture and sweat, and is comfortable to wear.

The invention relates to a vibration attenuation damping material and a preparation method thereof, and belongs to the technical field of vibration attenuation materials. The vibration attenuation damping material is prepared from the following raw materials: matrix resin emulsion and damping filler, wherein the matrix resin is a modified polyurethane-acrylate interpenetrating network polymer, and monomers of the modified polyurethane-acrylate interpenetrating network polymer comprise polyether glycol, isocyanate, methyl methacrylate and butyl acrylate; the damping filler comprises a core-shell structure A-B compound and a layered inorganic filler; a is selected from multiwalled carbon nanotubes, graphene, carbon fibers and nano titanium dioxide, and B is selected from nitrile rubber, styrene butadiene rubber, chloroprene rubber and carboxylated styrene butadiene rubber; the dosage of the A-B compound with the core-shell structure is 10-20% of the mass of methyl methacrylate. The material disclosed by the invention has relatively good vibration damping performance at different temperatures, has excellent weather resistance and rainwater resistance, can be suitable for different application environments, and has a very good application prospect.

The invention discloses a low-shrinkage acrylate gel material and a preparation method thereof. The gel material is prepared by mixing a solution A and a solution B according to an equal proportion, the liquid A comprises acrylate, a cross-linking agent, an accelerant and a retarder; the acrylate is a calcium acrylate solution, a magnesium acrylate solution or a mixed solution of calcium acrylate and magnesium acrylate; the concentration of the acrylate in the solution A is 15wt.%-35wt.%; the liquid A is also added with a modified material, and the modified material is selected from at least one of hydroxyethyl ester, chloroprene rubber, polyurethane, polyvinyl alcohol and epoxy resin; the addition amount of the modified material is 1%-5% of the total mass of the solution A; the solution B comprises an initiator and distilled water; the initiator is selected from at least one of ammonium persulfate, hydrogen peroxide and azodiisobutyronitrile; the use amount of distilled water in the solution B is determined according to initiator concentration; by optimizing an acrylate compound system, introducing an anti-shrinkage functional component and accurately controlling a preparation process, the comprehensive improvement of material performance and engineering applicability is finally realized.

The invention discloses feeding and mixing equipment for producing neoprene grafted adhesive. The feeding and mixing equipment comprises a feeding box fixed above a mixing mill through a bracket, a group of feeding pipes vertically distributed on the bottom surface of the feeding box front and back, discharging mechanisms arranged in the feeding pipes and sealing mechanisms arranged in openings in the bottoms of the feeding pipes. Through the cooperative design of the feeding box, the feeding pipe and the discharging mechanism, the surfaces of powder particles can be coated to form a water film so as to increase the weight, the powder particles coated with the water film are subjected to jet feeding, the feeding effect is good, resources are saved, the neoprene grafted adhesive mixing effect and the finished product quality are improved, and the production cost is reduced. The problems of insufficient powder feeding amount, resource waste, reduced mixing effect and influence on the quality of a neoprene grafted adhesive finished product due to the fact that powder is easy to drift and cannot completely fall on a base material under the action of gravity under the influence of air flow generated by external environment air flow and mixing mill operation are avoided.

The invention relates to a wear-resistant antiskid sole material and a synthesis method thereof, and belongs to the field of sole materials. The wear-resistant anti-skid sole material is prepared from the following components in parts by weight: 45-65 parts of ethylene-vinyl acetate copolymer EVA, 20-35 parts of nitrile rubber, 10-23 parts of anti-aging particles, 4-8 parts of nano zinc oxide, 5-8 parts of nano magnesium oxide, 2-4 parts of hollow glass beads and 3-6 parts of white carbon black. According to the invention, the anti-aging particles are synthesized, the chloroprene rubber is taken as a base material for synthesis of the anti-aging particles, the chlorotriazine DACT and the anti-aging agent are compounded in the chloroprene rubber, the dispersing agent is utilized to uniformly disperse the chlorotriazine DACT and the anti-aging agent in the chloroprene rubber, and the chloroprene rubber can protect the chlorotriazine DACT and the anti-aging agent; the action time of the chlorotriazine DACT and the anti-aging agent is prolonged, so that the anti-aging performance of the sole is improved.

The invention relates to the technical field of sealing strips, and provides a tensile rubber sealing strip for an automobile and a preparation method of the tensile rubber sealing strip. The rubber sealing strip is prepared from, by weight, 65-75 parts of ethylene propylene diene monomer, 25-35 parts of chloroprene rubber master batch, 30-40 parts of thermoplastic polyurethane elastomer, 30-40 parts of filler, 1-2 parts of vulcanizing agent, 8-12 parts of vulcanization accelerator, 3-5 parts of plasticizer, 3-5 parts of anti-aging agent, 1-2 parts of stearic acid and 2-4 parts of zinc oxide, and the chloroprene rubber master batch is prepared from chloroprene rubber and 4-N-carbobenzoxy amino cyclohexanone. By means of the technical scheme, the problem that in the prior art, the rubber sealing strip is insufficient in tensile property is solved.

Provided are a rubber composition capable of giving vulcanized molded objects having a satisfactory balance among oil resistance, freeze resistance, and flex fatigue resistance, and a vulcanizate and a vulcanized molded object which have a satisfactory balance among oil resistance, freeze resistance, and flex fatigue resistance.According to the present invention, there is provided a rubber composition including a chloroprene-based rubber and an epichlorohydrin-based rubber, wherein the rubber composition contains 5 to 95 parts by mass of the chloroprene-based rubber and 5 to 95 parts by mass of the epichlorohydrin-based rubber, per 100 parts by mass of rubbers contained in the rubber composition, and the chloroprene-based rubber has a content of an unsaturated nitrile monomer unit of less than 25% by mass.

The invention discloses an elastic composite shielding cable for a ship and a preparation process thereof, and aims to solve the problems of poor environmental adaptability, low shielding effectiveness, insufficient elasticity and unstable process of an existing ship cable. The cable sequentially comprises a conductor layer, an insulating layer, a composite shielding layer and a sheath layer from inside to outside, wherein the conductor layer is formed by twisting a plurality of strands of superfine tinned oxygen-free annealed copper wires, and two 1500D aromatic polyamide fiber elastic cores are arranged in the center of the conductor layer; the insulating layer is made of ethylene propylene rubber or thermoplastic elastomer, and the dielectric constant is not more than 3.0; the composite shielding layer is of a double-layer structure of aluminum-plastic composite tape wrapping and tinned copper wire weaving, and the shielding effectiveness of the X wave band is larger than or equal to 30 dB. The sheath layer is of a chloroprene rubber or polyurethane double-layer structure, tests such as C5-M-grade salt mist are carried out, the preparation process comprises the steps of conductor twisting, insulation extrusion, composite shielding forming and the like, various parameters are accurately controlled, the bending radius of the cable is smaller than or equal to 6D, and the cable is stable in performance after being repeatedly bent for 1000 times, low in smoke, halogen-free, flame-retardant, adaptive to severe environments of ships, stable in process and high in reliability. And reliable operation of ship equipment can be ensured.

The invention belongs to the technical field of cable preparation methods, and provides a preparation method of an offshore photovoltaic cable and the cable, and the preparation method comprises the steps: S1, carrying out the wire drawing and annealing of a high-purity copper rod, and then carrying out the stranding, thereby forming a stranded flexible conductor; s2, extruding a cross-linked polyethylene material on the surface of the stranded flexible conductor, and forming an extruded insulating layer after cross-linking; s3, twisting a plurality of insulated wire cores rightwards, filling a polypropylene rope and wrapping a high-strength non-woven fabric; s4, extruding a chloroprene rubber material outside the high-strength non-woven fabric, and forming an extruded inner sheath after vulcanization; s5, weaving a special-shaped copper and steel wire mixed armor layer outside the inner sheath; and S6, extruding a polymer material containing an antifouling agent outside the armor layer. Compared with the prior art, according to the cable production method in the scheme, from flexible conductor twisting to outer sheath layer extruding, each layer is optimally designed for specific challenges of the marine environment, the specific challenges include the twisting mode, the twisting pitch, tension control and the like, and laying in the complex marine environment is facilitated.

The invention discloses a weather-resistant insulated overhead cable, which relates to the technical field of cables and comprises a cable mechanism. The cable mechanism is characterized in that: the cable mechanism comprises a conductor, an insulating layer, an inner sheath layer and a steel belt armor; the invention arranges the inner sheath layer and the steel belt armor in layers on the outer side of the conductor; the inner sheath layer adopts chloroprene rubber as a main raw material; the chloroprene rubber has excellent weather resistance, ozone resistance, chemical corrosion resistance and flame retardancy; carbon black can enhance the wear resistance and tear resistance of the inner sheath layer and improve its weather resistance at the same time; an antioxidant can effectively delay the aging speed of the inner sheath layer; a plasticizer improves the flexibility and processing performance of the chloroprene rubber; the inner sheath layer is wrapped outside the shielding layer and further protects the inner insulating layer and the shielding layer; the good weather resistance of the inner sheath layer can resist the erosion of the internal structure by the external environment, and synergizes with the outer insulating layer to enhance the weather resistance of the entire cable.

The invention relates to the technical field of rubber products, in particular to a flame-retardant fire hose lining and a preparation method thereof.The preparation method comprises the steps that S1, modified chloroprene rubber, reinforcing filler, a plasticizer and an anti-aging agent are added into an internal mixer to be mixed for 2-3 h and cooled to the room temperature, and a vulcanizing-agent-free rubber compound is prepared; mixing the rubber compound without the vulcanizing agent, a cross-linking agent, the vulcanizing agent and a vulcanization accelerator on a double-roller open mill to prepare a rubber compound containing the vulcanizing agent; s2, molding the rubber compound containing the vulcanizing agent, and vulcanizing on a plate vulcanizing machine to obtain primary vulcanized rubber; and S3, carrying out secondary vulcanization on the primary vulcanized rubber to obtain the flame-retardant fire hose lining. The prepared flame-retardant fire hose lining has the advantages of favorable flame retardancy, high tensile strength, high elongation at break, stable mechanical properties, favorable aging resistance and favorable wear resistance, and can still maintain favorable toughness in a low-temperature environment, thereby obviously enhancing the overall performance and prolonging the service life of the fire hose.

According to the air bag rubber shuttle wheel and the preparation method, a ternary rubber compound of chloroprene rubber, natural rubber and butadiene rubber is used as matrix rubber, and the mechanical property, wear resistance and heat resistance of a rubber matrix are improved by adding KEVLAR fibers, a two-dimensional nano material and the like. And the air bag type rubber shuttle wheel is constructed by the rubber matrix, and the air bag is integrally formed, so that the number of joints is small, the stress concentration is reduced, and the service life of the air bag type rubber shuttle wheel can be greatly prolonged. According to the shuttle wheel, a main heat conduction network is constructed through the two-dimensional nanosheets, the KEVLAR fibers can serve as an auxiliary heat conduction bridge to synergistically reduce dynamic heat generation, the heat conduction performance of the shuttle wheel is improved in combination with a hollow air bag structure, and the problems that an existing shuttle wheel is poor in high temperature resistance and heat conduction performance and short in service life are solved.

The utility model discloses a diving fabric implanted with patterns. The diving fabric comprises a foamed chloroprene rubber sponge sheet, a graphene coating, a patch, a floral pattern layer and a titanium coating. The foamed chloroprene rubber sponge sheet subjected to compression treatment is used as a base material, the compressed sponge sheet is higher in apparent density, the internal hash molecular structure of the sponge sheet is tighter, the surface of the sponge sheet is smoother, printing materials such as printing ink can better permeate into the surface layer of the sponge sheet, and patterns and the sponge sheet are fused together; a layer of textile fabric does not need to be added between the floral patterns and the sponge sheet, the floral patterns can be better presented while environmental protection is achieved, and the service life of the floral patterns is prolonged. In addition, the titanium coating enables the floral patterns to be better in oxidation resistance and friction resistance, the floral patterns printed on the sponge sheet can be better protected, the corrosion resistance and abrasion resistance of the floral patterns in a seawater environment are improved, the service life of the floral patterns is prolonged, and the attractiveness of the floral patterns is improved.

The invention relates to the technical field of high polymer materials, and particularly discloses high-weather-resistance chlorinated polyethylene and a preparation method thereof. The high-weather-resistance chlorinated polyethylene is prepared from the following raw materials in parts by weight: 110 to 150 parts of chlorinated polyethylene, 9 to 15 parts of chloroprene rubber coated nano titanium dioxide, 38 to 60 parts of ionic liquid modified nano calcium carbonate, 5 to 10 parts of polyvinylidene fluoride resin, 10 to 20 parts of chlorinated paraffin and 1 to 6 parts of antioxidant, the preparation method comprises the following steps: S1, preparing chloroprene rubber coated nano titanium dioxide; s2, preparing ionic liquid modified nano calcium carbonate; s3, internal mixing; and S4, carrying out screw extrusion and press polish. The high-weather-resistance chlorinated polyethylene can be used for building waterproof coiled materials, outdoor protective coatings, automobile sealing strips, wire and cable sheaths and the like, and has the advantages of high tensile strength, elongation at break, impact toughness, ultraviolet aging resistance and thermo-oxidative degradation resistance.

The invention discloses a corrosion-resistant water-stop belt and a preparation method thereof, and relates to the technical field of high-molecular compound composition water-stop belts. The corrosion-resistant water-stop belt is prepared from the following raw materials in parts by mass: 50-70 parts of ethylene propylene diene monomer, 20-40 parts of chloroprene rubber, 3-8 parts of zinc oxide, 1-3 parts of stearic acid, 1-2 parts of an anti-aging agent, 5-15 parts of paraffin oil, 20-40 parts of white carbon black, 30-50 parts of calcium carbonate, 1.5-3 parts of sulfur and 0.5-1.5 parts of an accelerant. The accelerant accurately regulates and controls the sulfur cross-linking process to form a high-density and uniform sulfur bond network structure, so that the material can still maintain excellent mechanical properties such as tensile strength and elongation at break in a corrosion environment, and sealing failure caused by swelling or aging is avoided.

The invention relates to the technical field of rubber hoses, and provides a coal mine underground ultrahigh-pressure long-distance liquid supply rubber hose which sequentially comprises an inner rubber layer, a reinforcing layer and an outer rubber layer from inside to outside. Wherein the raw materials of the outer rubber layer comprise the following components in parts by weight: 80-100 parts of chloroprene rubber, 50-70 parts of an ethylene-vinyl alcohol copolymer, 55-65 parts of a filler, 20-30 parts of carbon black, 8-10 parts of a plasticizer, 3-7 parts of an activator, 3-5 parts of a vulcanizing agent, 1.5-2 parts of an accelerant and 2-4 parts of an anti-aging agent, the filler is modified aluminum oxide, the modified aluminum oxide is obtained by modifying aluminum oxide with a modifier, the modifier comprises carboxymethyl cellulose, and the plasticizer is a plasticizer. The substitution degree of the carboxymethyl cellulose is 0.80. According to the technical scheme, the problem that the high temperature resistance of an outer rubber layer of a coal mine underground ultrahigh-pressure long-distance liquid supply rubber pipe is poor in the prior art is solved.

The invention relates to the field of rubber, and provides a modified graphene-chloroprene rubber composite material and a preparation method thereof, the modified graphene-chloroprene rubber composite material comprises the following raw materials by weight: 90-110 parts of chloroprene rubber, 5-9 parts of modified graphene, 5-15 parts of a composite vulcanizing agent, 0.3-2 parts of an accelerator, 0.5-8 parts of an anti-aging agent, and 3-7 parts of a plasticizer. The modified graphene-chloroprene rubber composite material provided by the invention has good wear resistance and strength, and has good commercial application value.

This invention discloses a water-stopping structure and construction method for vertical joints in ultra-long dam panels. The structure includes a mortar pad filled with grooves in the vertical joint. A neoprene rubber gasket is placed on the upper surface of the mortar pad, and a water-stopping copper sheet is placed on the neoprene rubber gasket. The water-stopping copper sheet includes a copper lug and two side wings positioned opposite each other on either side of the copper lug. The copper lug is filled with a flexible material and sealed with tape. The flexible filling material includes a neoprene rubber rod placed at the bend inside the copper lug and a polyethylene closed-cell foam board placed on one side of the neoprene rubber rod. A composite water-stopping layer covers the upper surfaces of the two side wings of the water-stopping copper sheet. Through this multi-layered synergistic seepage prevention structure, the rigid water-stopping load-bearing capacity and the flexible water-stopping deformation are adapted to each other, improving the water-stopping effect.

The invention belongs to the technical field of flame-retardant sponges, and discloses a carbonized flame-retardant chloroprene rubber sponge rubber plate with an open pore structure. Comprising 100 parts of chloroprene rubber, 4 parts of high-activity magnesium oxide, 5 parts of zinc oxide, 1 part of stearic acid, 0.5-1.5 parts of an accelerant DBTU, 1-1.5 parts of an accelerant ETU, 2 parts of an anti-aging agent, 3-5 parts of a foaming agent, 3-6 parts of a foaming promoter, 2-3 parts of PEG4000, 5-8 parts of a flame retardant TPP, 20-30 parts of zinc borate, 20-30 parts of antimony trioxide, 20-30 parts of a flame retardant, 10-15 parts of precipitated white carbon black and 15-20 parts of dibutyl phthalate. The foaming agent and the foaming aid are composed of a foaming agent H, urea ester and diethylene glycol. The advantages of chloroprene rubber are fused, flame-retardant auxiliaries including triphenyl phosphate, antimony trioxide, zinc borate, tris (2, 3-dibromopropyl) isocyanuric acid ester and triallyl isocyanuric acid ester are added, and the multiple auxiliaries have a synergistic effect to form a main flame-retardant action mechanism including heat absorption, dehydration, air isolation and rapid charring.