4747 results about "Vulcanization" patented technology

The invention relates to a high / low-temperature-resistant wear-resistant tear-resistant fluorosilicone rubber compound and a preparation method thereof, and belongs to the technical field of special rubber materials, the high / low-temperature-resistant wear-resistant tear-resistant fluorosilicone rubber compound comprises the following components: raw fluorosilicone rubber, a reactive liquid rubber compatibilizer, a reinforcing filler, a tear-resistant aid, a high-temperature-resistant aid, a vulcanizing agent, an accelerant, an anti-aging agent and an anti-attrition filler, the provided reaction type liquid rubber compatibilizer contains vinyl carboxyl liquid fluorosilicone rubber, the tear-resistant auxiliary agent contains zinc polymethacrylate, the high-temperature auxiliary agent contains vinyl fluorosilane modified carbon nanotubes, and the anti-friction filler contains molybdenum disulfide and layered nano zirconium phosphate which are treated by oxygen plasma. The high and low temperature resistance stability, oil resistance, wear resistance and tear strength of the fluorosilicone rubber are synergistically improved by regulating and controlling the multi-cross-linked network structure of the fluorosilicone rubber, strengthening the interface action of the rubber and the filler and optimizing the composite vulcanization system, meanwhile, structuralization of a rubber compound is prevented by optimizing the preparation process, and the requirement for adaptability to severe working conditions is met.

The invention belongs to the field of workshop dynamic scheduling, and provides a dynamic disturbance-oriented tire vulcanization workshop intelligent flexible scheduling method and system, and the method comprises the steps: building a production scheduling model with the minimization of the maximum completion time as an optimization target; obtaining an initial processing sequence and a selectable machine set of each workpiece process, and solving by taking the production scheduling model as a target function to obtain an optimal initial scheduling scheme; when a dynamic event occurs in the production process, detecting the type of the dynamic event and the occurrence time of the event, and extracting a completed process, a processing process and an unstarted process; and determining a to-be-scheduled process based on the influence of the dynamic event on the processing process and the unstarted process, retaining the process processing sequence of the optimal initial scheduling scheme, updating the optimal processing machine of the to-be-scheduled process, and generating a rescheduling scheme. The device only replaces a machine in an unprocessed process, is embedded into a cooling time buffer area between the same workpiece processes, solves the problem of insufficient cooling of the rubber material, and guarantees the quality and process stability.

The invention discloses a metal coiled material double-sided gluing all-in-one machine which is characterized in that the metal coiled material double-sided gluing all-in-one machine comprises a coiled material unwinding mechanism, a coiled material front side gluing mechanism, a two-layer coiled material drying tunnel furnace, a coiled material back side gluing mechanism, a coiled material vulcanization tunnel furnace and a coiled material winding mechanism, and the coiled material vulcanization tunnel furnace is located at the top of the two-layer coiled material drying tunnel furnace in parallel; the coiled material front face gluing mechanism and the coiled material back face gluing mechanism are located on the two sides of the two-layer coiled material drying tunnel furnace respectively, the coiled material unwinding mechanism is located on the side, away from the coiled material drying tunnel furnace, of the coiled material front face gluing mechanism, and the coiled material winding mechanism is located on the side, away from the raw material drying tunnel furnace, of the coiled material back face gluing mechanism. The device has the advantages that the device has the effects of scraping and coating the rubber on the two sides of the metal coiled material, and continuously drying and vulcanizing the rubber on the two sides of the metal coiled material.

The invention belongs to the technical field of rubber, and discloses bio-based reinforced resin, a preparation method, a rubber composition and application. The bio-based reinforced resin is prepared from lignin, cashew nut shell oil, rosin or derivatives thereof and a vegetable fat modifier, the biochar content is up to 100%, the Mooney viscosity and MH of a sizing material are obviously reduced, and the bio-based reinforced resin has the advantages of long scorching time and high vulcanization speed in the sizing material application process.

The invention discloses a recovery treatment process of heavy metal production wastewater, and relates to the technical field of wastewater treatment. Adjusting the pH value of the wastewater through pretreatment and stirring; 5%-10% of nanometer seed crystals are added in the seed crystal reinforced vulcanization process, a vulcanizing agent is controllably added, and large-particle-size precipitates are generated through pulse stirring; magnetic field separation is performed after magnetic microsphere adsorption; carrying out selective adsorption and acid regeneration on the chitosan-based magnetic resin; micro pollutants are removed through cooperation of the three-dimensional electrode and photocatalysis; concentrating 10-20 times by membrane distillation to enrich heavy metals; metal simple substances with the purity larger than or equal to 99.5% are recycled through pulse electrodeposition; and after deep treatment, the wastewater reaches the standard to be discharged or recycled (the recycling rate is greater than or equal to 70%). The process innovation comprises the steps of enhancing the seed crystal to improve the vulcanization efficiency by 30%, realizing rapid separation by a magnetic material, reducing the energy consumption by 40% by a three-dimensional electrode coupling membrane method, and constructing a vulcanizing agent regeneration (the regeneration rate is greater than or equal to 85%) and heavy metal closed-loop recovery system. Compared with a traditional process, the heavy metal removal rate is larger than or equal to 99.8%, the treatment cost of each ton of water is reduced by 25%-30%, and the method has the advantages of high efficiency, low consumption, environmental protection and recycling and is suitable for multi-metal complex wastewater.

The invention discloses a forming device and a forming method of a high-temperature-resistant low-temperature-resistant high-toughness cable. According to the invention, based on a double-substrate synergistic system of hydrogenated nitrile rubber and polyether type thermoplastic polyurethane, and in combination with a dynamic vulcanization crosslinking technology, the cable keeps excellent flexibility and tear resistance in a wide temperature range of-60 DEG C to 125 DEG C. A three-dimensional reinforced network of nano silicon dioxide and carbon nanotubes is directionally dispersed in a matrix, and mechanical support of aramid short fibers is matched, so that the cable is endowed with bending fatigue resistance, the durability of the drag chain cable in a high-frequency torsion scene of an oil platform exceeds 30 million cycles is realized, and the service life of the drag chain cable is prolonged. The problem of breakage caused by low-temperature embrittlement and high-temperature softening of a traditional cable is fundamentally solved, the synergistic effect of the perfluoropolyether surface modifier and the composite anti-aging system enables the cable to form a stable protective layer in strong acid, strong alkali, salt mist and oil stain environments, and chemical corrosion and ultraviolet irradiation are effectively resisted.

The invention relates to the technical field of tire blank quality evaluation and processing, in particular to a tire blank quality evaluation and processing method and system based on digital twinning, and the method comprises the following steps: aiming at entity equipment required from tire blank molding to vulcanization in a tire production process in a data twinning system; constructing an equipment digital twinborn model and a process flow digital twinborn model; constructing a standard tire blank digital twinborn model, and controlling the entity production system to operate based on the standard tire blank digital twinborn model; receiving actual processing data fed back by the entity production system, and constructing an actual tire blank digital twinning model in the data twinning system; comparing the standard tire blank digital twin model with the actual tire blank digital twin model, and calculating tire blank quality deviation and quality classification; and based on a preset grading treatment strategy and the quality grading result of the tire blank, carrying out grading treatment on the tire blank. Therefore, quality evaluation can be carried out on the unvulcanized tire blank, grading treatment is carried out in time, resource waste is effectively reduced, the production cost is reduced, and the product quality is guaranteed.

The invention discloses a low-resistance and high-wear-resistance tire rubber composition as well as a preparation method and application thereof, and belongs to the technical field of rubber materials. The tire rubber composition comprises the following raw materials in parts by weight: 50-70 parts of natural rubber NR, 30-50 parts of solution polymerized styrene-butadiene rubber SSBR, 40-60 parts of modified white carbon black, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 1-3 parts of an anti-aging agent 6PPD and 2.5-3.5 parts of a vulcanization system. The prepared tire rubber material has the advantages that the rolling resistance is obviously reduced, the wear resistance is improved, the energy consumption is effectively reduced, and the requirements of new energy automobiles on high-performance tires are met. Through three-step modification treatment, the white carbon black is uniformly dispersed in a rubber matrix, and the interface bonding is firm, so that the prepared tire can reduce the rolling resistance of the tire using the tread rubber, and the tread rubber has higher wear resistance, tensile strength and elongation at break, and accords with the development direction of new energy automobiles in the future.

The invention relates to the technical field of silicone rubber, and discloses flame-retardant and heat-insulating silicone rubber and a preparation method thereof.The flame-retardant and heat-insulating silicone rubber is obtained by reacting a flame-retardant aid with hollow glass beads and then adding the reaction product, methyl vinyl silicone rubber, hydroxyl silicone oil, a reinforcing agent, a flame retardant and a vulcanizing agent into an open mill to be mixed and vulcanized. The flame-retardant auxiliary agent contains a siloxane structural unit and is grafted on the surfaces of the hollow glass beads, so that the compatibility between the flame-retardant auxiliary agent and the methyl vinyl silicone rubber is improved, the hollow glass beads are more uniformly dispersed in a silicone rubber matrix, a uniform heat insulation network is formed, the heat conductivity is reduced, and the heat insulation performance is improved. The flame-retardant auxiliary agent contains nitrogen-rich triazine groups, and generates nitrogen and other non-combustible gases during combustion, so that the oxygen concentration of the combustion atmosphere can be diluted, and the limit oxygen index, flame retardance and high-temperature resistance of the silicone rubber are improved.

The application provides a masterbatch type vulcanization aid and a preparation method thereof, a rubber composition, a rubber product and a tire. The preparation method comprises the following steps: S1, pre-reaction of stearic acid, an antioxidant and a vulcanization system to obtain a pre-reaction mixture; and S2, mixing of the pre-reaction mixture with rubber to obtain the masterbatch type vulcanization aid. Under the catalysis of stearic acid, the reagents in the antioxidant and the vulcanization system react to generate active intermediates. The active intermediates have the effect of promoting vulcanization and play the role of activating accelerators in advance, so that the active intermediates can replace the role of zinc oxide. The product after reaction is mixed with rubber, and the masterbatch formed can be used to prepare rubber products such as tires without containing zinc elements, so that zinc emission can be realized, and the environment is friendly.

The utility model relates to the technical field of inflatable hoses, in particular to a high-performance wear-resistant extremely-cold-resistant inflatable hose. The inflation hose comprises a metal corrugated pipe, the metal corrugated pipe is sleeved with a steel wire mesh sleeve, the steel wire mesh sleeve is sleeved with a long connecting pipe, the long connecting pipe is sleeved with a vulcanization layer, one end of the metal corrugated pipe is connected with a long inner cone connecting nozzle in an inserted mode, and the outer surface of the long inner cone connecting nozzle is sleeved with a nut in a threaded mode. And a long outer cone connecting nozzle is inserted into the other end of the steel wire mesh sleeve. The inflatable hose can meet the requirement of a dew point of-65 DEG C by adopting a metal corrugated pipe structure, can meet the requirements of 40MPa working pressure and 120MPa bursting pressure structure by adopting a steel wire mesh sleeve structure and adopting a high-pressure brazing form after double-layer weaving, and meanwhile, the vulcanization layer is arranged outside the long connecting pipe in a sleeving manner, so that the service life of the long connecting pipe is prolonged. Therefore, the inflatable hose has excellent oxidation resistance, ozone resistance and erosion resistance.

The invention relates to the technical field of thermoplastic vulcanizates, and discloses a TPV sealing material and a preparation method thereof. The TPV sealing material is prepared from the following raw materials in parts by weight: 10 to 30 parts of PP resin, 40 to 60 parts of EPDM rubber, 10 to 20 parts of polylactic acid, 15 to 25 parts of filler, 0.5 to 1.5 parts of vulcanizing agent, 0.3 to 1.5 parts of vulcanization accelerator, 5 to 10 parts of compatilizer, 1 to 4 parts of modified heat stabilizer and 0.5 to 3 parts of modified anti-aging agent. Through preparation of the modified heat stabilizer, structural damage or sealing failure caused by thermal aging of a system can be reduced, and the service life of the sealing material is greatly prolonged; the preparation of the modified anti-aging agent can effectively resist the corrosion of environmental factors such as thermal oxidation and ozone to the system, and prevent the problems of cracking, hardening, elasticity attenuation, sealing failure and the like of the sealing material after long-term use.

The invention provides a low-compression-stress low-density heat-conducting gasket and a preparation method thereof.The heat-conducting gasket is prepared from, by weight, 100-300 parts of vinyl silicone oil, 1-3 parts of end chain hydrogen-containing silicone oil, 2-6 parts of side chain hydrogen-containing silicone oil, 0.2-0.6 part of platinum catalyst, 300-700 parts of heat-conducting filler, 0.1-0.5 part of coupling agent and 0.1-0.5 part of inhibitor. Wherein the vinyl silicone oil is prepared by matching two kinds of vinyl-terminated polydimethylsiloxane with different viscosities and vinyl contents; and the heat-conducting filler is a ternary combination of spherical aluminum oxide, spherical boron nitride and beta-type silicon nitride with a lubricating function. The preparation method comprises the following steps: adding the raw materials into stirring equipment, controlling the vacuum degree during stirring by adopting staged negative pressure, stirring under the conditions that the negative pressure is less than or equal to-0.095 MPa,-0.06 to-0.07 MPa and less than or equal to-0.095 MPa in sequence, fully mixing the materials, clustering, transferring to a calender, and carrying out high-temperature vulcanization molding at 120-140 DEG C. The heat-conducting gasket has the characteristics of low compression stress and low density, and the production efficiency is remarkably improved.

The invention discloses a large model material formula design and evaluation method and system based on multi-agent collaboration and a storage medium, and relates to the technical field of artificial intelligence auxiliary material research and development and multi-agent systems. Comprising the steps of receiving target material performance parameters and constraint conditions input by a user through a computer interaction interface; according to the method, a plurality of initial formulas are output by setting a generation agent, and formulas which do not meet environmental protection standards are removed in combination with a mechanism agent, so that the problems of frequent violation of a rubber vulcanization ratio, low manual screening efficiency, coating forbidden solvent omission and the like in an existing monomer model and a manual post-treatment scheme are effectively solved; and the evaluation agent can synchronously estimate the rationality of the formula, and the decision-making agent outputs the optimal formula based on the comprehensive score, so that the experimental verification link of the invalid formula is reduced, and the final formula is ensured to meet the use and production requirements.

The utility model discloses a pattern block with an exhaust channel and a tire vulcanization mold, the pattern block comprises stacked pattern sheets, and each pattern sheet is provided with an auxiliary groove forming part; the concave part of the end surface of the auxiliary groove forming part forms an auxiliary groove; each pattern sheet is also provided with an end face exhaust groove and a through hole; the through holes penetrate in the thickness direction of the pattern piece, the auxiliary grooves and the end face exhaust grooves are located in the same end face of the pattern piece, and the auxiliary grooves, the end face exhaust grooves and the through holes are sequentially communicated; an exhaust gap is formed between every two adjacent pattern pieces; the exhaust gap is connected with the inner circumferential face of the tire vulcanization mold and extends in the circumferential direction, and the auxiliary groove and the end face exhaust groove are both communicated with the exhaust gap. Through the arrangement of the exhaust gap, when a tire is manufactured, gas in the inner cavity of the tire vulcanization mold can be fully exhausted in time, and the tire production efficiency is improved; meanwhile, due to the arrangement of the auxiliary grooves, the exhaust gaps are prevented from being stuck with rubber materials, and the service life of the tire vulcanization mold is prolonged.

The invention provides an anti-sticking perfluoroether rubber sealing assembly and a preparation method and application thereof, the preparation method comprises the following steps: mixing perfluoroether rubber with a vulcanizing agent to obtain a rubber compound, and performing high-temperature vulcanization on the rubber compound to obtain a perfluoroether rubber product; carrying out surface roughening treatment on the perfluoroether rubber product; dispersing amorphous fluororesin in the fluorinated liquid to obtain coating slurry; and coating the roughened perfluoroether rubber product with the coating slurry, and carrying out segmented heating and drying to obtain the perfluoroether rubber sealing assembly. According to the anti-sticking perfluoroether rubber sealing assembly as well as the preparation method and the application thereof, the obtained perfluoroether rubber sealing assembly has relatively low friction coefficient, excellent plasma corrosion resistance and relatively small viscous force, shows excellent non-sticking performance, and can be suitable for different environments.

The present invention relates to the field of rubber processing, and more specifically, to an EPDM rubber preparation process. The process comprises the following steps: Step 1: heating a plurality of raw materials so that they are in a fluid state and then mixing; Step 2: kneading the rubber raw materials obtained after mixing, and inspecting the kneaded products; Step 3: vulcanizing the inspected raw materials; Step 4: extruding and molding the rubber raw materials transported out after vulcanization, and completing the unloading and packaging. The EPDM rubber preparation process is realized by using EPDM rubber preparation, and the device comprises a molding frame for extruding and molding rubber, a door panel is slid on one side of the molding frame, and a plurality of circular plates are rotated on the molding frame, and a knife capable of cutting the rubber raw materials is slid on the plurality of circular plates. It can destroy the pores in the accumulated rubber raw materials.

The invention discloses a tire vulcanization mold line polishing device, and relates to the technical field of tire vulcanization mold machining, the tire vulcanization mold line polishing device comprises a base, the upper end of the base is fixedly connected with a hydraulic oil cylinder, and the movable end of the hydraulic oil cylinder is fixedly connected with a machining table; the grinding mechanism comprises a mounting frame fixedly connected to the upper end of the base, a rotating shaft is rotationally connected to the top in the mounting frame, a circular plate is fixedly connected to the side wall of the rotating shaft through a plurality of fixing rods, a plurality of sliding grooves are formed in the upper end of the circular plate, and two clamping grooves are symmetrically formed in the inner walls of the sliding grooves; the inner walls of the two clamping grooves are slidably connected with two clamping blocks, the side walls, close to each other, of the two clamping blocks are jointly and fixedly connected with a sliding block, and the upper end of the sliding block is rotatably connected with a first rotating rod. According to the tire mold polishing device, the distance between the polishing rollers is adjusted by driving the electric push rods to stretch or retract, so that the whole device can polish tire molds of various specifications, the application range is wide, and the practicability is higher.

The invention discloses a cross-linking agent for rubber and a preparation method thereof. The preparation method comprises the following steps: S11, dissolving 2, 4-dichlorobenzoic acid in tert-butyl alcohol, and dropwise adding concentrated sulfuric acid to obtain a mixed solution; s12, slowly dropwise adding a hydrogen peroxide solution into the mixed solution, and oxidizing to obtain a primary oxidized solution; s13, carrying out secondary oxidation on the primary oxidation solution obtained in the step S12 to obtain a secondary oxidation solution; and S14, purifying the secondary oxidation liquid obtained in the step S13 to obtain the cross-linking agent for rubber. The application of the cross-linking agent for the rubber in the rubber comprises the following steps: S21, banburying raw materials and the cross-linking agent for the rubber to prepare a rubber material; and S22, feeding the rubber material in the step S21 into a vulcanizing machine, and vulcanizing to obtain the rubber. The prepared cross-linking agent for the rubber is good in performance, the preparation method is simple, emission of three wastes is small, the atom utilization rate is high, and after the cross-linking agent is applied to the rubber, the prepared rubber is good in tensile strength, elongation at break and wear resistance index.

The environment-friendly cable ethylene-propylene insulation material comprises the following raw materials: ethylene propylene diene monomer, an elastomer, a reinforcing agent, a flame retardant, a vulcanizing activator, a filler, a plasticizer, an anti-aging agent, a vulcanizing agent and a silane coupling agent. 50-70 parts by mass of ethylene propylene diene monomer rubber; the elastomer is a POE (polyolefin elastomer) of 30-50 parts; the flame retardant is prepared from 30 to 50 parts of nano magnesium hydroxide, 5 to 10 parts of microencapsulated red phosphorus and 3 to 5 parts of zinc borate; and the plasticizer is paraffin oil. According to the ethylene-propylene insulating material, a halogen-free flame-retardant system is combined with an interface modification technology, so that the defects of poor mechanical property and high material toxicity of a traditional material are overcome. The oxygen index is greater than or equal to 38%, the tensile strength is greater than or equal to 10Mpa, and the material is suitable for high-risk mine environments.

The invention relates to the technical field of materials, and discloses silicone rubber for a flame-retardant functional cable accessory and a preparation method thereof.The silicone rubber is prepared by taking methyl vinyl silicone rubber as a base material and maleic anhydride grafted SEBS, a flame-retardant material and the like as auxiliary materials through mixing, extrusion and vulcanization processes, the flame-retardant material is of a fluorene-thioether alternating block structure, and the flame-retardant functional cable accessory has the advantages that the flame-retardant functional cable accessory is obtained; the structure of the flame retardant contains a large number of phosphorus flame retardant elements, fluorene heterocyclic rings can serve as a carbon source, sulfur and phosphorus elements can serve as acid sources, and secondary amine connected with the structure can serve as a gas source, so that the flame retardant has the characteristics of a three-source-integrated intumescent flame retardant, and can interact with a maleic anhydride grafted SEBS structure in the subsequent high-temperature vulcanization process; therefore, the purpose of effectively improving the flame retardant property of the silicone rubber by adding a small amount of the flame retardant is achieved, and the flame retardant long-term effect of the silicone rubber can be guaranteed. In addition, the fluorene heterocyclic ring is high in rigidity, and the mechanical strength of the silicone rubber can be improved to a certain extent.

The invention relates to a fiber composite material, and discloses a preparation method of a para-aramid and natural rubber high interface performance composite material, which comprises the following four steps: preparing a chloroform solution of natural rubber, preparing a nano para-aramid-natural rubber composite mixing material, preparing impregnated para-aramid, and mixing and vulcanizing. According to the preparation method, the para-aramid is effectively connected with the matrix through the'bridge 'effect of the para-aramid nanophase by a method for constructing the para-aramid nanophase in the matrix material, so that the interfacial acting force of the para-aramid is enhanced, and the high performance of the para-aramid in the composite material is fully exerted; the problems of poor interfacial compatibility with a base material, low binding force and the like caused by smooth surface and chemical inertness of the para-aramid at present are effectively solved, and the para-aramid nanophase can also remarkably improve the strength and toughness of the base material.

The utility model is applicable to the technical field of vulcanizing machines, and provides a heating device of a rubber product vulcanizing machine, which comprises a machine base, support frames are fixedly connected to the top of the machine base, and a plurality of layers of heating plates are slidably arranged between the support frames. A motor is started to drive a lead screw to rotate, so that a threaded sleeve is driven to move front and back to drive a connecting plate to slide front and back, and a scraper moves along the surface of a heating plate along with sliding of the connecting plate and is driven to rotate to be flush with the heating plate when moving to the forefront of the heating plate; after the heating plate is heated, residues generated in the cleaning process of removing the residues on the heating plate can fall into the collecting frame, follow-up treatment is facilitated, and after cleaning is completed, the collecting frame can be taken down for cleaning and reinstalled on the supporting plate, so that the heating plate better plays a heating role, the vulcanizing efficiency is improved, the energy consumption is reduced, the production cost is reduced, and the product quality is improved.

The invention relates to the technical field of composite gaskets, in particular to an anti-deformation composite gasket for a new energy thermal management system, which comprises a metal gasket and a rubber body, the metal gasket is integrally in a circular ring shape and is divided into an outer circular ring body and an inner ring belt, and the inner ring belt is positioned on the inner ring of the metal gasket and is thinner than the outer circular ring body; more than three grooves which are uniformly and equally divided are formed in the circumference of the inner ring of the metal gasket, and the rubber body is vulcanized on the inner edge of the metal gasket, is higher than the outer circular ring body towards the two sides in the thickness direction and wraps the outer circular ring body. The design that the rubber body wraps the outer circular ring body guarantees that the rubber body and the metal gasket are tightly combined, the sealing effect of the composite gasket in an automobile air conditioner pipeline system is greatly improved through the improvements, air conditioner refrigerant leakage is prevented, meanwhile, vibration in the automobile running process is absorbed, and noise generated by vibration is reduced.

The invention relates to the technical field of high polymer material modification and processing, in particular to a modification formula and production process of an impact-resistant and high-heat-resistant MPP cable protection tube, and the formula comprises 60-80 parts of a polypropylene base material, 8-15 parts of a nano-composite reinforcing agent, 5-12 parts of a heat-resistant modifier, 3-8 parts of an impact-resistant modifier and the like. The production process comprises the steps of nanofiller surface functionalization, multi-stage melt blending, dynamic vulcanization forming, pulse type vacuum setting and online detection, and the prepared pipe is excellent in impact resistance and heat resistance and high in size precision. The pipe provided by the invention has the advantages of zero fracture in drop hammer impact, vicat softening temperature of 152 DEG C, ring stiffness of 60.16 kN / m < 2 > and small dimensional deviation; the process improves filler dispersity, has low rejection rate and energy consumption, has comprehensive performance superior to that of traditional products, and is suitable for complex working conditions.

The invention relates to a film covering process of a butyl rubber plug, which belongs to the technical field of butyl rubber plug preparation and is characterized in that during processing, in the same way as the prior art, a bonding surface of a film belt used for being bonded with a mixed rubber sheet needs to be activated, and then the bonding surface of the film belt is bonded with one side surface of an unvulcanized mixed rubber sheet; the film belt covers and is fixed on the mixing rubber sheet in an adhesion manner, and the key point is that in the covering and fixing process, the film belt is conveyed forwards in a manner of floating on a flowing liquid surface, and is attached and fixed with the mixing rubber sheet above the film belt in the conveying process, so that the film belt is prevented from being pulled by a conventional belt similar to a belt in belt transmission; and the film belt is prevented from being torn and damaged. The film laminating process can prevent the film belt from being torn due to mechanical traction and pulling as much as possible, and the processing process is convenient and reliable.

The invention relates to the technical field of polymer insulating materials, in particular to a flexible low-smoke halogen-free polypropylene insulating material and a preparation method thereof. The invention discloses an ultra-soft low-smoke halogen-free polypropylene insulating material, which comprises the following components in parts by weight: 50-80 parts of block co-polypropylene; 10 to 40 parts of organic silicon rubber; 0.06 to 0.24 part of a bis-2, 5 vulcanizing agent; the material further comprises an antioxidant, a compatilizer, a flame retardant, a flame retardant synergist, a lubricant and the like. The insulation material provided by the invention is good in flexibility and convenient to install and lay under the condition of ensuring that the polypropylene cable material meets flame-retardant energy absorption and electrical insulation properties. The preparation method of the insulating material adopts a dynamic vulcanization technology, and the organic silicon rubber is distributed in the polypropylene material in a'sea-island 'or'sea-sea' structure, so that the hardness of the matrix resin is reduced on the premise of ensuring the mechanical property of the material. Meanwhile, a surface modification mode of the flame retardant is optimized, so that the hardness of the material is further reduced. And the odor emission of the material in the production and use processes can be effectively reduced, so that the material is more environment-friendly.

The present invention discloses an auxiliary spring that compensates for the height decrease due to the creep of a rubber body in a mechanical transmission manner, which includes a rigid core shaft, a rubber body vulcanized and bonded to the outer periphery of the core shaft, a metal outer sleeve vulcanized and bonded to the outer periphery of the rubber body, and a support plate horizontally installed on the top of the metal outer sleeve. A height lifting device is provided between the core shaft and the base. The lifting device includes a frame base, a lifting mechanism installed on the frame base, a torsion transmission mechanism, and a pressure storage mechanism. When the rubber body has crept and dropped to a set height, the carriage is in a heavy load condition, and the auxiliary spring encounters a downward overload impact, the support plate sinks and presses down the pressure storage mechanism, and the pressure storage mechanism temporarily stores the pressure. When the downward overload impact is released or the carriage heavy load is released, the pressure stored in the pressure storage mechanism causes the lifting mechanism to lift the auxiliary spring upward through the torsion transmission mechanism, thereby realizing the compensation for the decreased height of the auxiliary spring.

The invention relates to the technical field of rubber-plastic composite flame-retardant materials, and provides a graphite rubber-plastic composite flame-retardant material and a preparation method thereof.The preparation method comprises the following processes that nitrile rubber, polyvinyl chloride, dioctyl phthalate, modified expandable graphite, a stabilizer, sulfur and an anti-aging agent are added into a high-speed mixer and mixed to be uniform, and a premix is obtained; and feeding the premix into a double-screw extruder, and carrying out melt blending, extrusion and vulcanization to obtain the composite flame-retardant material. The preparation method has the beneficial effects that the modifier is combined with the expansible graphite and compounded with the nitrile rubber, the polyvinyl chloride and other base materials, so that the flame retardant property and the mechanical property of the prepared composite material are remarkably improved.

The invention discloses a flame-retardant and wear-resistant rope and a preparation method thereof, and belongs to the technical field of rope processing. The rope comprises a steel wire rope and a rubber sheath; wherein the rubber sheath comprises inner-layer rubber and outer-layer rubber; the inner-layer rubber is prepared from the following components: butadiene styrene rubber, white carbon black, an activating agent, a reinforcing agent, an anti-aging agent, gamma-mercaptopropyltriethoxysilane, a rubber adhesive, cobalt neodecanoate, sulfur and a vulcanization accelerator; the outer-layer rubber comprises the following components: butadiene styrene rubber, nitrile rubber, a flame-retardant wear-resistant reinforcing agent, white carbon black, an activating agent, a reinforcing agent, an anti-aging agent, an antistatic agent, sulfur and a vulcanization accelerator; the cross section of the rope is designed to be flat, the width of the rope is 30-250 mm, the thickness of the rope is 10-40 mm, and the mass of the rope per meter is 0.5-25 kg / m. The prepared rope has excellent flame retardance, wear resistance and antistatic performance, the adhesive force between the rubber layer and the steel wire is large, and the rope is not prone to being abraded or peeled off in long-term use.