127 results about "Compression set" patented technology

The invention discloses a preparation method of a rubber waterstop material with a low compression set rate, which comprises the following steps: firstly, carrying out blending reaction on hydroxyl silicone oil and boric acid to obtain liquid polyborosiloxane; the preparation method comprises the following steps: adding liquid polyborosiloxane and natural rubber into an internal mixer according to a ratio, and carrying out internal mixing to obtain a mixture; adding zinc oxide, an anti-aging agent, stearic acid and an anti-tearing agent into the obtained mixture, and continuously mixing; continuously adding kaolin talcum powder, calcium carbonate, calcium oxide, white carbon black, N550, N330 and KH550, and internally mixing again to obtain a preform; adding a vulcanization accelerator and a vulcanizing agent into the preform, and continuously mixing to obtain a rubber material to be vulcanized; and vulcanizing and forming the rubber material to be vulcanized to prepare the rubber water-stop belt material with the low compression set rate. According to the invention, the compression set rate of the rubber material can be reduced while the tensile strength, elongation, tear resistance and other properties of the rubber are not sacrificed, so that the product performance is enhanced.

The invention relates to the field of shoe materials, and particularly discloses an EVA and PEBAX blended foaming material for shoes and a preparation method of the EVA and PEBAX blended foaming material. The EVA and PEBAX blended foaming material for the shoes is prepared from the following raw materials in parts by weight: 70 to 90 parts of EVA resin, 10 to 30 parts of PEBAX, 0.8 to 1.2 parts of dodecyltrimethylammonium bromide modified rectorite, 2 to 5 parts of a foaming agent, 0.5 to 2 parts of a foaming aid, 3 to 5 parts of filler, 2 to 4 parts of a reinforcing agent, 0.5 to 2 parts of a cross-linking agent, 0.6 to 3 parts of a lubricating agent and 1 to 4 parts of a compatilizer. The material for the shoes has the advantages of being high in tear strength, uniform in foaming, light in weight and small in permanent compression deformation.

The invention belongs to the technical field of polyurethane materials, and provides high-frequency high-damping low-compression permanent deformation polyurethane and a preparation method and application thereof.The high-frequency high-damping low-compression permanent deformation polyurethane is prepared from a polyol component and an isocyanate component according to the proportion that the isocyanate index is 1.05-1.15; wherein the polyol component is prepared from the following components in parts by mass: 60 to 80 parts of polyether polyol, 15 to 25 parts of a chain extender, 15 to 25 parts of a damping agent, 3 to 8 parts of nano montmorillonite, 0.03 to 0.08 part of a catalyst and 0.5 to 1.5 parts of an antioxidant; the isocyanate component is a mixture of 4, 4 '-diphenylmethane diisocyanate and hexamethylene diisocyanate in a mass ratio of (2.5-3): 1; the polyurethane material is good in damping performance and low in compression set, has certain flame retardant property, is used for preparing the base plate for the railway, has excellent vibration and noise reduction and steel rail stripping and abrasion inhibition effects, and remarkably prolongs the service life of the steel rail.

The invention discloses self-adhesive single-component liquid silicone rubber with low compression set and a preparation method thereof. The preparation method comprises the following steps: kneading high-viscosity double-end vinyl polydimethylsiloxane, white carbon black, hexamethyldisilazane and water to prepare base rubber; and uniformly mixing and stirring the base rubber with double-end vinyl polydimethylsiloxane, polydimethylmethylvinylsiloxane, polydimethylmethylhydrosiloxane, a first functional aid, a second functional aid, an inhibitor and a catalyst in proportion to prepare the single-component liquid silicone rubber. The silicone rubber has excellent bonding performance on various substrates such as stainless steel, aluminum materials, copper materials, kovar alloys, nylon, polycarbonate and PBT (polybutylene terephthalate), has excellent mechanical properties and low compression set rate, is suitable for sealing and bonding of various automobile, industrial and electronic components, and has wide application prospects. The present invention relates to a sealing strip, in particular to a sealing adhesive scenario for in-situ curing sealing gasket (CIPG) applications, instead of a conventional sealing strip.

The invention relates to the technical field of high polymer material and automobile part manufacturing, and discloses a high-durability high-low temperature resistant automobile composite sealing strip, which is prepared from the following raw materials: ethylene propylene diene monomer, polyisoprene grafted maleic anhydride, pre-dispersed master batch, carbon black and a vulcanization system. The pre-dispersed master batch takes oxidized polyethlene wax as a carrier to wrap zinc oxide and D-mannitol. The phase change characteristic of the carrier is utilized, active components are isolated in the mixing and extruding stage, and scorching is prevented; the components are released in the high-temperature vulcanization stage to initiate anhydride ring opening, and a double cross-linked network with coexistence of covalent bonds and ionic bonds is constructed. According to the sealing strip, the macromolecular reactive plasticizer is used for replacing part of liquid paraffin, the atomization problem caused by micromolecule migration is solved, the high-temperature compression permanent deformation rate is remarkably reduced through a thermal reversible mechanism of an ion cluster, and excellent low-temperature rebound resilience and processing safety are both considered.

The invention relates to the technical field of polyurethane materials, in particular to a polyurethane elastic backing plate for a railway and a preparation method of the polyurethane elastic backing plate. The polyurethane elastic base plate provided by the invention is a low-compression permanent-deformation polyurethane elastic base plate for a railway, the raw materials and the preparation process of the polyurethane elastic base plate are specifically shown in the following description, and under the matching of the whole formula, the microphase separation degree of a hard section and a soft section in long-term service is effectively controlled; the polyurethane elastic backing plate not only has low compression set, but also has excellent tensile mechanical properties and static stiffness, lower-35 DEG C low-temperature static stiffness change rate, lower dynamic and static stiffness ratio and lower 30-day high-temperature aging static stiffness change rate.

The invention relates to the technical field of transformer sealing rubber, in particular to an ACM rubber material for sealing a high-performance transformer and a preparation method of the ACM rubber material. The ACM rubber sizing material for sealing the high-performance transformer comprises the following raw materials: 80-150 parts of acrylate rubber, 5-15 parts of ethylene acrylate rubber, 5-15 parts of epoxy resin, 5-10 parts of graphene oxide, 1-5 parts of tetraethoxysilane, 1-3 parts of dendritic polyamidoamine, 1-2 parts of a plasticizer, 1-3 parts of an anti-aging agent, 1-2 parts of a vulcanizing agent and 0.1-0.5 part of an assistant vulcanizing agent. The preparation method is simple, all the raw materials are uniformly mixed, the crosslinking effect is good, the rubber material strength is high, the service life of the transformer sealing element under the low-temperature working condition can be remarkably prolonged, the leakage rate can be remarkably reduced, the rubber material has the extremely low compression set rate and the high mechanical performance, and reliable guarantee is provided for safe operation of electrical equipment.

The invention belongs to the technical field of rubber products, and discloses a wear-resistant sealing rubber strip and a preparation method thereof.The rubber strip is composed of an elastomer matrix, graft-modified nano-silica, surface-activated aramid staple fibers and solid lubricating filler, the nano-silica is grafted with a bifunctional silane coupling agent containing an epoxy group and an amino group, and the surface-activated aramid staple fibers are grafted with the solid lubricating filler; the solid lubricating filler and aramid staple fibers which are subjected to plasma treatment and coated with isocyanate prime coat form a compact skeleton network with covalent bonds and strong hydrogen bond interaction, the solid lubricating filler is distributed in skeleton gaps in a limited mode, a low-friction film layer is formed in situ in the friction process, and fiber pulling-out is restrained. The structure has an interface cooperation effect and a function coupling effect, compression set and low-temperature flexibility can be improved while abrasion resistance is remarkably improved, DIN abrasion and compression set are both reduced, the low-temperature springback retention degree is improved, comprehensive performance optimization of abrasion resistance, springback and flexibility is achieved, and the structure is suitable for high-durability occasions of automobile doors, windows and mechanical seals.

A clamp assembly for adjusting the fluid flow rate in an infusion set is provided. The clamp assembly includes a housing having two opposing side walls spaced apart from each other and having opposing guide grooves, a guide wall disposed between the side walls, an elastomeric segment disposed between the two opposing side walls and the guide wall, the elastomeric segment having a lower compression set performance that the compression set performance of first and second IV tubes of the infusion set, and first and second tubing ports. A flow-regulating member is seated in the guide grooves and is configured to remain in a set position during use of the infusion set based on the compression set performance of the elastomeric segment until the roller wheel is moved by a user. A method of operating a clamp assembly is also provided.

The present invention provides a photocurable resin composition capable of forming a cured product that has excellent adhesiveness and allows for easy dimensional control of compression ratio, with almost no permanent compression set.　The photocurable resin composition according to the present invention contains components (A) to (C), and contains 50 parts by mass or more of component (B) per 100 parts by mass of component (A). Component (A): a monofunctional urethane (meth)acrylate oligomer having a hydrogenated polybutadiene skeleton. Component (B): a monofunctional (meth)acrylate monomer having a C5-10 linear alkyl group (excluding component (A)). Component (C): a photoradical polymerization initiator.

The utility model discloses a compressor impeller dismounting device of a centrifugal steam compressor, which can more easily dismount a compressor impeller and save manpower. Comprising a transverse plate, one end of the transverse plate fixes a vertical plate, one end of the vertical plate fixes a square plate, the square plate fixes a hanging plate extending downwards, and an L-shaped limiting face is arranged at the bottom of the square plate; the lower portion of the hanging plate is sleeved with a pressing sleeve, the pressing sleeve is used for being arranged on an impeller locking nut in a sleeved mode, the end face of one end of the pressing sleeve is used for being pressed on an air compression impeller for positioning, the other end of the pressing sleeve is provided with a first threaded hole, one end of a threaded rod is in threaded fit with the first threaded hole, and the end of the threaded rod is provided with a second threaded hole. The other end of the threaded rod is sequentially sleeved with a positioning nut and a threaded rod sleeve to form threaded fit, the peripheral face of the threaded rod sleeve is in threaded fit with a limiting nut, and the outer surface of the limiting nut is matched with the L-shaped limiting face of the square plate.

The invention provides a rubber composite material as well as a preparation method and application thereof, and belongs to the technical field of bridge supports. The rubber composite material comprises the following raw materials in parts by mass: 100 parts of matrix resin, 35-45 parts of hydroxyl modified fumed silica, 8-12 parts of a plasticizer, 3-5 parts of nano-zinc oxide, 3-5 parts of a composite anti-aging agent, 3-4 parts of a coloring agent, 2-2.8 parts of a cross-linking agent, 1-2 parts of a coupling agent and 0.05-0.1 part of a platinum complex catalyst, wherein the composite anti-aging agent comprises a hindered amine stabilizer and an organic tin antioxidant. The obtained rubber composite material is excellent in weather resistance, free of cracking after ozone exposure and wide in temperature adaptability, the tensile strength is improved by 20%, the compression set is reduced by 52%, the mechanical property is obviously improved, the rubber composite material is applied to a bridge support, the service life of the prepared support can reach 60 years or above, and the service life of the bridge support is greatly prolonged.

The invention relates to the technical field of silica gel high polymer materials, in particular to temperature-resistant low-compression-deformation foamed silica gel and a preparation process thereof. The problem that in the prior art, foamed silica gel is poor in high-temperature resilience performance is solved. The foamed silica gel is prepared from a component A and a component B through dynamic mixing and injection molding, wherein the basic sizing material adopts vinyl-terminated polydimethylsiloxane, vinyl-terminated polymethylphenyl siloxane and vinyl phenyl MQ silicon resin, and is matched with HMDS in-situ modified fumed silica to construct an enhanced network; a side chain fluorine-containing foam stabilizer and a liquid-phase cerium complex are introduced into the component B; a three-stage temperature control process of nucleation foaming, gel explosion and vulcanization after gradient high temperature is adopted. Through addition of the nano rigid particles and deep thermodynamic relaxation treatment, the problems of collapse and rebound failure of a closed pore structure of existing foamed silica gel at long-term high temperature are solved, and the foamed silica gel is suitable for heat-resistant sealing and buffer heat insulation of new energy batteries and precise electronic components.

The invention provides a compression device and a volume ratio control method thereof. The compression device comprises a machine body, a screw compression set, a volume adjusting set, a driving set and a control module. The body has a suction end and an exhaust end opposite to the suction end. The screw compression set is arranged in the machine body. And the volume adjusting group is arranged in the machine body corresponding to the screw compression group. The driving group is coupled to the volume adjusting group and is used for driving the volume adjusting group to adjust the volume ratio. The control module is electrically connected to the driving group and is used for detecting the running states of the front and back time sequences and recording the running states as corresponding evaluation indexes. Based on the comparison result of the evaluation indexes of the front-back time sequence, the control module controls the driving group to drive the volume adjusting group to adjust the volume ratio.

This invention discloses a FEBD seamless bridge deck connection plate and a cross-joint bridge deck structure and construction method, comprising several UHPC blocks arranged sequentially along the longitudinal direction of the bridge, T-shaped expansion joints between adjacent UHPC blocks, and compressible elastic material filling the T-shaped expansion joints. The invention is characterized by further comprising: steel formwork, tension cables, insulating hoses, and series springs. This invention not only automatically adapts to the expansion and contraction deformation of the bridge caused by temperature changes, but also resists or eliminates uneven stress concentration along the transverse direction of the T-shaped expansion joints, and improves the overall rotational and flexural deformation performance of the beam ends. Furthermore, when the compressible elastic material loses its elasticity and undergoes permanent compression deformation after prolonged use, causing it to detach from the steel formwork within the T-shaped expansion joint, the tension cables can be used to bring the series-connected UHPC blocks together, thereby reducing the width of the T-shaped expansion joint and allowing the compressible elastic material to re-fit and contact the steel formwork.

The application provides a simulation analysis method for compression deformation characteristics of a rubber pad, and relates to the field of rubber pad product testing. The application constructs a finite element grid model based on geometric parameters and initial material parameters of the rubber pad, identifies geometric singularity regions with displacement gradient mutation; applies a test loading load on the model, extracts displacement path curvature and performs gradient correction on material parameters, and constructs a local material constitutive relation; performs compression deformation simulation based on the local constitutive relation, analyzes strain energy accumulation sequence and determines an energy transmission control region; determines a dominant constraint mode in combination with the spatial corresponding relationship between the energy transmission control region and the geometric singularity region, and performs incremental correction on the simulation result, so as to realize accurate prediction of non-uniform compression deformation characteristics of the rubber pad.

The invention discloses a rubber composition and a method for processing the rubber composition, and a sealing element using the rubber composition and a production method thereof. The rubber composition comprises, in parts by weight, 100 parts of a rubber matrix, 2-20 parts of a cross-linking system, 60-300 parts of a reinforcing filler, 20-170 parts of a plasticizer and 3-25 parts of a metal oxide, wherein, the rubber matrix comprises a branched polyethylene with a content represented as A, in which 0<A≤100 parts, and both an EPM rubber and an EPDM rubber with a total content represented as B, in which 0≤B<100 parts. The invention provides a sealing element with good compression set resistance.

This invention relates to the field of life assessment of rubber sealing materials, and particularly to a method for assessing the life of nuclear-grade nitrile rubber sealing rings. The method includes: Step 1: Cutting samples that meet the compression set test requirements from finished secondary filter sealing rings; Step 2: Fixing the sample in a fixture, placing it under test conditions for 3 days, then opening the fixture, placing it again for one day, and measuring the height as the initial height; Step 3: Conducting aging experiments on the sample at several different aging temperatures; Step 4: Measuring the aging height of the sample at regular intervals and calculating the compression set until the compression set exceeds 50%; Step 5: Calculating the life based on the aging test data. This method uses two different standards and models to calculate the life using the aging test data, and the evaluation results using both models further demonstrate the validity and accuracy of the data.

The present disclosure relates to a hydrosilylation (addition) curable silicone rubber composition, a silicone elastomer material produced by curing the hydrosilylation (addition) curable silicone rubber composition and having improved high temperature (≧190°C) compression set according to ISO 815-1 Method A, and a method for preparing the silicone elastomer material.

The application discloses a thermoplastic elastomer with low compression permanent deformation characteristics, which comprises the following raw materials in parts by weight: 45-55 parts of hydrogenated polystyrene-butadiene-styrene block copolymer, 25-30 parts of polystyrene, 2-6 parts of vulcanizing agent, 3-6 parts of hydroxyl silicone oil, 2-5 parts of auxiliary oil, 5-7 parts of filler and 1-2 parts of antioxidant. The thermoplastic elastomer uses the hydrogenated polystyrene-butadiene-styrene block copolymer and polystyrene as the base material, and adds vulcanizing agent, hydroxyl silicone oil and auxiliary oil to enhance the functional effect of the product and improve the low compression permanent deformation characteristic performance of the product.

The utility model discloses a kind of label paper compression setting devices, including rack and two compression mechanisms, conveying frame and conveyor are provided on the rack, two The compression mechanism is correspondingly set in the position of rack above and below conveying frame, the compression mechanism includes driver, mounting seat and lifting seat, the lifting seat is slidably connected with the mounting seat;The compression mechanism of the label paper compression setting device above conveying frame is driven by driver to move lifting seat and limit pressure seat downwards, the compression mechanism below conveying frame is driven by driver to move lifting seat and top base upwards, top base extends from conveying frame and lifts egg box on conveying frame to limit pressure seat, and then automatically carries out compression setting processing to egg box and label paper, replaces manual operation mode and improves work efficiency, and top base lifts egg box and limit pressure seat cooperation to carry out compression processing can limit egg box, to prevent the deviation of the conveying position of egg box.

A rubber compression permanent deformation detection device disclosed by the present invention comprises a box body, the top of the box body is fixedly connected with a plurality of vertical rods, the plurality of vertical rods are arranged in a rectangular array, the top ends of the plurality of vertical rods are jointly and fixedly connected with a top plate, and the positions, close to the top ends, of the outer sides of the plurality of vertical rods are jointly and fixedly sleeved with a placement plate. A rectangular opening is formed in the top of the placing plate, an air cylinder is fixedly connected to the top of the top plate, and the bottom end of a power output shaft of the air cylinder penetrates through the top plate and is fixedly connected with a heating plate. And when the position of the heat preservation box is restored, the rotating plate is driven to turn over, when the rotating plate turns over, the scraping plate can be driven to move, the surface of the electric heating plate is cleaned, and rubber is prevented from being adhered to the surface of the electric heating plate under the high-temperature condition.

The invention belongs to the technical field of thermoplastic polyurethane elastomers, and relates to a thermoplastic polyurethane elastomer for supercritical foaming and a preparation method thereof. The preparation method comprises the following steps: (a) uniformly mixing cerium-doped mesoporous titanium dioxide with a micromolecular dihydric alcohol chain extender to obtain a mixture; and (b) mixing the mixture, organic diisocyanate and polyether glycol, and carrying out polymerization reaction to obtain the thermoplastic polyurethane elastomer for supercritical foaming. The preparation method is simple, the prepared thermoplastic polyurethane elastomer for supercritical foaming integrates high melt strength of TPU and a wide supercritical foaming temperature window, and a foam product prepared from the thermoplastic polyurethane elastomer for supercritical foaming has excellent falling ball resilience and low compression set.

Provided is a charging roll for electrophotographic equipment that is provided with a surface layer that can reduce both compression set and wear of a photosensitive member, and that can also reduce changes in characteristics due to moisture absorption. [Solution] A charging roll 10 for an electrophotographic device comprises a shaft 12, an elastic layer 14 formed on the outer peripheral surface of the shaft 12, and a surface layer 16 formed on the outer peripheral surface of the elastic layer 14, wherein the surface layer 16 includes the following (a) to (c): (a) Crosslinked water-dispersible polyurethane dispersion (b) Crosslinked water-dispersible isocyanate (c) Crosslinked composite of water-dispersible polyurethane dispersion and water-dispersible isocyanate

This invention discloses a high-resilience EPDM rubber sealing gasket and its preparation method, belonging to patent classification number C08K13 / 02, and relating to the field of EPDM rubber technology. The method first introduces flexible segments composed of liquid polyisobutylene and hydroxyl-terminated polybutadiene into an EPDM matrix to construct a low-energy-consumption subelastic network; then, a core-shell structure filler with silica as a rigid core and acrylate copolymer as an elastic shell is prepared to eliminate the rigid constraints of traditional filler interfaces; simultaneously, hyperbranched polyesteramide and nano-boron nitride are introduced as a synergistic system to bridge the polarity difference between the flexible segments and the core-shell filler through molecular bridging, and to reduce energy loss by utilizing the low friction and thermal conductivity of nano-boron nitride. The resulting sealing gasket exhibits high resilience, low compression set, and excellent mechanical strength.

To provide a conjugated diene polymer capable of obtaining a rubber composition excellent in balance of compression set and durability under a low temperature, and a rubber composition using the conjugated diene polymer.SOLUTION: A conjugated diene polymer has a molecular weight distribution of less than 1.5 as measured by gel permeation chromatography (GPC), a peak-top molecular weight of the lowest molecular weight peak (A) in the molecular weight distribution curve of 300,000 or more, a single glass transition temperature (Tg) peak in differential scanning calorimetry (DSC) measurement, the Tg peak being -92°C or lower, and a nitrogen content of 80 ppm or more.SELECTED DRAWING: None

To provide a rubber molding which has good workability of a rubber composition, easily exhibits desired attenuation properties (for example, high attenuation in a wide frequency region and a wide temperature region), and is formed by vulcanizing the rubber composition, wherein the rubber molding suppresses tackiness of the surface and suppresses a compression permanent strain rate at high temperature.SOLUTION: A rubber composition contains 90 to 100 pts.mass of butyl rubber, 15 to 60 pts.mass of a C5 aliphatic saturated hydrocarbon resin and / or a C5 aromatic modified aliphatic-based hydrocarbon resin having a glass transition temperature (Tg) of 40°C or higher and lower than 60°C, 8 to 30 pts.mass of silicone oil having a kinetic viscosity at 25°C of 10 to 500 mm2 / s, 0.2 to 0.7 pt.mass of sulfur as a vulcanizing agent, and 3 to 13 pts.mass of a sulfur compound (sulfur donor compound) capable of becoming a sulfur donor, when the total rubber component is 100 pts.mass.SELECTED DRAWING: None

To provide a molding composition enabling production of a molded article having internal voids while suppressing decrease in breaking strength and decrease in compression set.SOLUTION: A molding composition comprising the following components (A) and (B): Component (A): a matrix component having thermosetting properties; and Component (B): particles comprising a thermoplastic resin, the particles having a melting point of 70 to 150°C as measured by differential scanning calorimetry (DSC), a melting enthalpy (ΔHm) of 50 to 200 J / g as measured by differential scanning calorimetry (DSC), and a ratio (ΔHm / ΔHc) of the melting enthalpy (ΔHm) to the crystallization enthalpy (ΔHc) as measured by differential scanning calorimetry (DSC) of 0.3 to 2.0.SELECTED DRAWING: None

To provide a fluorinated copolymer composition whereby a crosslinked rubber article which has a low compression set at high temperature and which is not broken after compression can be formed, and a crosslinked rubber article. The fluorinated copolymer composition of the present invention comprises a fluorinated copolymer (A) having units having a nitrile group and units based on tetrafluoroethylene, a fluorinated copolymer (B) having units having at least one functional group selected from the group consisting of a group having a carbonyl group, a hydroxy group, an epoxy group and an isocyanate group and units based on tetrafluoroethylene, and a crosslinking agent.

The invention discloses a preparation method of a POE (Polyolefin Elastomer)-based sneaker insole material capable of accurately regulating and controlling crosslinking strength. The method comprises the following steps: blending insole materials containing an ethylene / alpha-olefin copolymer and a peroxide crosslinking agent, extruding and foaming. According to molecular structure parameters of an ethylene / alpha-olefin copolymer (POE) base material, the cross-linking strength of the shoe material is accurately controlled within an optimal interval, excessive / insufficient cross-linking is avoided, particularly, the gel content is controlled within the optimal range of 60-80%, and a high rebound rate and a low compression permanent deformation rate are brought to a foaming insole.