329results about How to "Low compression set" patented technology

An EMI shielding spacer gasket assembly for interposition under a predetermined compressive load within an electronics enclosure between a first surface and an oppositely-disposed second surface of the enclosure. The assembly includes a frame member and an electrically conductive, elastomeric member extending along at least a portion of the perimeter of the frame member as retained on a corresponding peripheral edge surface thereof. The elastomeric member has an outboard side which is compressible axially under the compressive load for providing an electrically conductive pathway between the surfaces of the enclosure. In an uncompressed orientation, the outboard side of the elastomeric member exhibits elongate upper and lower bearing portions which are disposed at a spaced-apart radial distance from the frame member to define a corresponding bending moment arm. Each of the bearing portions is angularly deflectable relative to the moment arm to effect the compression of the elastomeric member under a relatively low compressive load.

A method for generating a thermoplastic foam from an aqueous dispersion, the aqueous dispersion comprising a thermoplastic resin, water, and a dispersion stabilizing agent, the method including: adding at least one froth stabilizing surfactant to the aqueous dispersion to form a mixture; adding a fiber to the mixture; and frothing the mixture to create a froth, removing at least a portion of the water in the froth to create a foam, wherein the foam generated has a non-cellular fibrillated morphology. In another aspect, embodiments disclosed herein relate to a foam having a thermoplastic-based, fibrillated, non-cellular structure, wherein the foam has an average density of about 0.02 g/cm³ to about 0.07 g/cm³. In certain embodiments, the foam may be used in an absorbent article.

The invention provides a high elasticity thermal plasticity elastic body and the method to make. The weight proportion of the elastic body includes: plasticity ingredient styrene-butadiene-styrene block copolymer 100, filling naphthenic oil or white oil 40-60, modification agent 0-110, stabilizing agent 2-10, lubricant 2-65, and other bulk agent 10-300. The invention has advantages of low compression deformation, strong flexing resistance and good resilience.

The invention relates to a liquid silicon rubber composition which comprises the following components in parts by mass: 100 parts of polydimethylsiloxane with vinyl as an end group, 1-400 parts of inorganic reinforcing agent, 1-20 parts of low-viscosity polydimethylsiloxane with a vinyl-containing side group, 0.01-10 parts of cross-linking agent, 1-30 parts of polydimethylsiloxane with hydroxyl as an end group, and a platinum catalyst capable of curing the liquid silicon rubber composition. The invention further relates to a preparation method of the liquid silicon rubber composition. The liquid silicon rubber composition has low viscosity and good fluidity before being cured and is applicable to injection molding; and the composition has excellent resilience and low compression deformation ratio after being cured. The liquid silicon rubber composition can be applied to an elastomer, a pressure roll and an image heating and fixing device in a copier and a laser printer as well as certain silicon rubber products in need of the properties.

A conductive thermoplastic elastomer composition including a continuous phase and first and second uncontinuous phases. The continuous phase and the first and second uncontinuous phases form a sea-island structure; and the first and second uncontinuous phases independently forming island structures. In this structure, the continuous phase contains a composition (A) which is a mixture of a thermoplastic elastomer and a thermoplastic resin; the first continuous phase contains a rubber component (B) containing at least one of diene rubber and ethylene-propylene-diene rubber; and the second continuous phase contains an ethylene oxide-propylene oxide-allyl glycidyl ether copolymer containing an anion-containing salt having a fluoro group and a sulfonyl group (component (C)).

The invention provides high-hardness extruded silicone rubber composition. The silicone rubber takes methyl vinyl siloxane with the average molecular weight of 0.55-0.75 million and the average vinyl molar content of 0.4-0.55% as rubber master batch, and reinforced white carbon black, silica powder, a structurized control agent, vinyl-terminated methyl vinyl silicone oil, an internal releasing agent, an anti-yellowing agent, magnesium oxide and cerium oxide are added. The prepared silicone rubber has high hardness, high resilience, relatively high elongation and high tear resistance after high temperature vulcanization and can be applicable to silicone products such as an industrial rubber-covered roller, a pressing wheel, a sealing ring and a sealing element.

The invention relates to a low-compressive-deformation and high-conductivity rubber composite material and a preparation method thereof. The low-compressive-deformation and high-conductivity rubber composite material is prepared by the following steps of: taking silicon rubber as a base body and utilizing modified grain-shaped and fiber-shaped metal-plating conductive fillers containing a reactive double-bond silane coupling agent under a CO2 supercritical state to prepare low-compressive-deformation and high-conductivity rubber composite material. Under the condition of guaranteeing the high conductivity, the use amount of the conductive fillers is reduced and the composite material has low compressive deformation and high conductive property.

The invention relates to a car door-window straight-line part gland strip and a preparation method, which iare used for solving the problem that the compression permanent deformation rate of the present car door-window straight-line part gland strip is high, and adopts the technical scheme that: the gland strip is prepared by the following substances in part by weight: 22 to 27 ethylene propylenediene rubber 9090M, 6 to 10 ethylene propylene diene rubber 3072EM, 1 to 3 active zinc oxide, 0.4 to 0.8 stearic acid, 0.4 to 1.0 dispersant L-24, 0.7 to 1.1 polyethyleneglycol, 25 to 30 general purpose furnace black (GPF)-grade carbon black N650, 10 to 14 heavy calcium carbonate, 16 to 20 paraffin oil, 1 to 3 calcium oxide, 1.3 to 1.7 accelerator, 0.05 to 0.08 antiscorching agent, 0.2 to 0.6 sulfur and 0.8 to 1.2 p,p'-Oxybis(benzenesulfonyl hydrazide) N8000W. The car door-window straight-line part gland strip has good elasticity, good aging resistance, excellent ozone property, good low-temperature application property and appropriate apparent density.

The invention discloses a novel sealing material, which consists of a core plate and elastic membrane layers compounded on two sides of the core plate, wherein the core plate a metal or non-metal core plate after surface treatment; the elastic membrane layers are prepared from elastic foaming materials or non-foaming materials which are compounded on the surfaces of the core plate in a mechanical or chemical mode to form the membrane layers. The sealing material has the advantages of simple structure, excellent compression resilience, wonderful long-term pressurization sealability, very low creep relaxation performance, long service life and wonderful conformability with a sealing surface.

A semiconductive rubber composition contains copolymerized rubber containing ethylene oxide; chloroprene rubber; and acrylonitrile-butadiene rubber. A conductive rubber roller has a conductive rubber layer composed of the semiconductive rubber composition on an outermost layer thereof.

A heat fixing roll or belt having a silicone rubber layer which is formed by curing a silicone rubber composition comprising (A) 100 pbw of an organopolysiloxane having at least two silicon-bonded alkenyl radicals in a molecule, (B) 20-500 pbw of a metallic silicon powder having an average particle size of up to 100 μm, and (C) an effective amount of a curing agent. The silicone rubber layer has a high heat conductivity and long-term temperature durability.

The invention discloses a high-temperature-resistant silicone rubber foam material and a preparation method thereof. The preparation method of the high-temperature-resistant silicone rubber foam material is characterized by comprising the following steps: mixing 100 parts of silicone rubber base stock, 20-35 parts of a reinforcing agent, 2-3 parts of a structure controlling agent, 0-0.2 part of colour master batch, 60-150 parts of a pore-forming agent and 4-5 parts of a radiation sensitizer, moulding, crosslinking through gamma ray radiation, forming pores through subsection dissolving-out, and drying, so that the silicone rubber foam material which is resistant to high temperature of 250 DEG C and still maintains excellent performance after equivalent time of 20000 hours can be obtained. The preparation method of the high-temperature-resistant silicone rubber foam material has the advantages that radiation crosslinking and dissolving-out pore forming are combined, so that crosslinking is uniform, control is easy, energy conservation and environmental protection are realized, a technology is concise, reproducibility is good, and production efficiency is high; the high-temperature-resistant silicone rubber foam material still maintains high tensile strength, high weight loss, low longitudinal deformation and low surface hardness after the equivalent time of 20000 hours at the temperature of 250 DEG C, permanent compressive deformation is slightly increased, the high-temperature-resistant silicone rubber foam material does not become brittle or hard, and the high-temperature-resistant silicone rubber foam material can serve as filling and positioning, sealing cushion, cable insulation as well as buffer and vibration-absorptive materials or parts which are used in high-temperature environment.

The invention discloses a halogen-free flame-retardation thermoplastic dynamic sulfurated ethylene-propylene-diene monomer rubber/polypropylene composition and a preparation method thereof. The ethylene-propylene-diene monomer rubber/polypropylene composition is prepared by ethylene-propylene-diene monomer rubber, polypropylene, coked piperazine phosphate, melamine pyrophosphate, zinc oxide, ethylene-propylene-diene-grafted maleic anhydride, an initiator, a vulcanizing agent, rubber softening oil and a lubricant. The preparation method comprises the following steps: 1) mixing EPDM, PP, coked piperazine phosphate, MPP, ZnO, EPDM-g-MAH and the lubricant, and dispersing the materials; 2) performing melt extrusion on a premix obtained in the step 1) and performing granulation on the premix; and 3) mixing the premix, the initiator, the vulcanizing agent and the rubber softening oil, extruding a mixture, and granulating the mixture. The ethylene-propylene-diene monomer rubber/polypropylene composition has the advantages of heat resistance, aging resistance, excellent mechanical property and flame resistance performance, enables thermoplastic processing, has a production process, and can be widely used for wire and cable compounds with high flame-resistance requirements.

The invention relates to a foaming material and a molding method thereof, in particular to an ethylene propylene diene monomer (EPDM) and chlorinated polyethylene (CPE) foaming material and a molding method thereof. The material is prepared in the following steps that: firstly, high-temperature mixed rubber containing ethylene propylene diene monomer (EPDM) and chlorinated polyethylene (CPE) is mixed in an internal mixer according to a formula; after piece output and placing, high-temperature mixed rubber is mixed into low-temperature rubber according to a mixture radio; after the low-temperature rubber is cut into pieces, foaming is extruded on an extruding machine; and secondary sulfuration and shaping are carried out in a drying tunnel after the extruding so as to manufacture the foaming material. The invention has the characteristics of favorable season durability, temperature durability, aging durability, damping seal, and the like, and can be applied to the fields of heat insulation of a central air conditioner and a pipeline of a refrigeration set, buffer pad, sound absorption, voice reduction, and the like.

Disclosed are footwear compositions comprising a propylene-based elastomer. The presence of the propylene-based elastomer provides the footwear sole with a well-balanced combination of desired properties, including low density, low compression set, and weldability.

Provided is a two-part curable silicone composition including: (A) 100 parts by mass of an organopolysiloxane containing at least two alkenyl groups bonded to silicon atoms, (B) an organohydrogenpolysiloxane containing at least two SiH groups, in sufficient quantity to provide from 0.5 to 5.0 mols of SiH groups within the component (B) for every 1 mol of alkenyl groups within the entire composition, (C) an effective quantity of a hydrosilylation reaction catalyst, and (D) from 0.0001 to 1 part by mass of a nitrogen-containing compound (a triazole-based compound and/or an imidazole-based compound), which is prepared in two separate parts, in which the components (A) through (C) do not exist within one part, and the component (D) exists in a different part from that of the component (C). Also provided are a method of curing the composition and a cured product obtained by the method. Further provided are a method for potting an electrical and electronic component using the composition and a method for producing a silicone rubber molded product using the composition. The composition is capable of stably maintaining favorable curability and a high level of flame retardancy or a low compression set, and is useful for silicone rubber potting materials and silicone rubber molded products.

The invention discloses a natural rubber vibration damping pad material. The raw materials include: natural rubber, 19-28 parts; carbon black, 7-12 parts; light calcium, 6-13 parts; stearic acid, 0.2-13 parts by weight. 0.5 part; anti-aging agent, 0.1‑0.3 part; sulfur, 0.1‑0.3 part; accelerator, 0.3‑0.5 part; vulcanization aid, 0‑0.1 part; coumarone resin, 0.5‑1 part; process oil, 3‑ 7 servings. The natural rubber vibration-damping pad material has good vibration-damping effect and excellent weather resistance, and at the same time has high radial strength, moderate hardness, good elasticity and long service life. The invention also discloses a preparation method of the natural rubber damping pad material.

The invention discloses an ethylene propylene rubber material for a sealing part of an automobile heat dissipation system and a production method of the ethylene propylene rubber material and belongs to the technical field of rubber. The rubber material is prepared from the following components in parts by weight: 100 parts of raw ethylene propylene rubber, 5 parts of zinc oxide, 0.5 to 1.5 parts of stearic acid, 3 to 6 parts of an anti-ageing agent, 20 to 30 parts of fast extruding carbon black N550, 10 to 20 parts of semi-reinforced carbon black N774, 3.5 to 7 parts of a cross-linking auxiliary agent Ricon 153D and 5 to 8.5 parts of a vulcanizing agent Perkadox 14-40B-GR. The rubber material disclosed by the invention has excellent high-temperature-resisting performance and can be used for a long time under the condition that the temperature is -50 DEG C to 150 DEG C; meanwhile, the rubber material has remarkable advantages of low temperature resistance and low-compression permanent deformation.