1307 results about "EPDM elastomer" patented technology

The invention relates to a tire of a structural combination of tire tread and sidewall components with compositional limitations containing minimal, if any, of in situ formed alcohol and methyl isobutyl ketone byproducts. The tread component rubber composition contains pre-hydrophobated silica reinforcement. The sidewall component contains low unsaturation EPDM or brominated copolymer of isobutylene and p-methylstyrene and may contain pre-hydrophobated silica reinforcement. The silica reinforcement for said tread and sidewall components is a pre-hydrophobated precipitated silica. The pre-hydrophobated silica is prepared, prior to mixing with the elastomer(s), by reacting hydroxyl groups (e.g. silanol groups) contained on the surface of a precipitated silica with an alkoxyorganomercaptosilane or a combination of an alkoxyorganomercaptosilane and a substituted alkylsilane or with a bis-3(trialkoxysilylalkyl) polysulfide which contains an average of from 2 to 4 connecting sulfur atoms in its polysulfidic bridge to form a composite thereof. The alcohol byproduct therefrom is removed from the composite prior to its introduction into the rubber composition(s). In another aspect of the invention, the connecting sidewall rubber composition, and optionally the tread composition is free of N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine antidegradant (referred herein to as 6PPD) in order to prevent in situ formation of methyl isobutyl ketone byproduct from the reaction of 6PPD with atmospheric oxygen and / or ozone.

The invention relates to a modified emulsified asphalt which is specially used for high-speed railway or light rail plate type ballastless track CA sand pulp, the preparation method and the CA sand pulp comprising the modified emulsified asphalt. According to the weight percentage, the modified emulsified asphalt comprises the following components: 45-65% of modified asphalt, 0.5-10% of cation surface active agent, 0.5-10% of non-ionic surface active agent, 0.1-10.0% of accessory ingredient and the rest of water; wherein, the modified asphalt includes 82.0-96.0% of matrix asphalt, 2-6% of polymer modifier having the grain diameter being smaller than or equal to 5mum, 0-10.0% of compatilizer and 0-2.0% of modified asphalt stabilizing agent; the polymer modifier is selected from SBS, SIS, SEBS, SBR, CR, EPDM, NBR, BR or NR. The modified emulsified asphalt has good stability, and the preparation method can improve the production efficiency of the CA sand pulp and the stability of quality, and expands the varieties of the modified emulsified asphalt which is specially used for the CA sand pulp.

A solar collector comprising a glass mirror, and a composite panel, wherein the back of the mirror is affixed to a front surface of the composite panel. The composite panel comprises a front sheet affixed to a surface of a core material, preferably a core material comprising a honeycomb structure, and a back sheet affixed to an opposite surface of the core material. The invention may further comprise a sealing strip, preferably comprising EPDM, positioned between the glass mirror and the front surface of the composite panel. The invention also is of methods of making such solar collectors.

The invention provides a bittern-free flame-proof thermal contraction sleeve which comprises (by weight ratio), (1) 100 parts of one or more selected from ethane-vinyl acetate copolymer (EVA), ethene-ethyl acrylate copolymer (EEA), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), (2) 5-50 parts of one or more selected from ethylene-propylene terpolymerisate rubber (EPDM), ethylene propylene rubber (EPM), dimethyl silicone rubber (MQ), methylvinyl silicone rubber (VMQ), methylsilicone rubber with phenyl and vinyl Group (PVMQ), thermoplastic elastomer styrene - butadiene - styrene blocked copolymer (SBS), styrene-isoprene blocked copolymer (SIS), (3) 50-100 parts of bittern-free flame retardant, and (4) 0.5-6 parts of coupling agent.

The invention relates to a low smoke halogen-free flame retardant ethylene-propylene-diene rubber and a preparation method by extrusion molding thereof; the preparation method comprises the following steps: firstly, raw rubber matrix is evenly mixed at 80-100 DEG C by an open mill or a banbury mixer, and then cooled down to the room temperature; carbon black, modified nanometer / micrometer hydroxide, plasticizer, flame retardant synergist, vulcanization accelerator and vulcanizing agent are added in sequence according to the proportion and evenly mixed. Mixed rubber is added into a single screw extrusion machine; the temperature of a machine body, a screw and a machine head is controlled to be 50-90 DEG C; the rotating speed of the screw is within 15-40 r / min to cause that glue stock is continuously squeezed out; and hot air (175-200 DEG C) or microwave (915-2450 MHz) is adopted to cause that the glue stock is continuously vulcanized and molded. The flame retardant ethylene-propylene-diene rubber has excellent mechanical property, low smoke halogen-free flame retardant performance and good extrusion performance, and is applicable to manufacturing of flame retardant gland strips used in doors and windows for building and vehicles.

The invention discloses a sealing strip which takes EPDM as the host material and the preparing method, which is characterized in that the composition contains the following constituents (expressed by wt percent): EPDM 26 percent, zinc oxide 1-1.5 percent, stearic acid 1-6 percent, polyethyleneglycol 0.5-1.6 percent, hydrafil 10-32 percent, zinc borate 5-16 percent, orthophosphoric lipid 3-16 percent, black carbon 7-20 percent, paraffin oil 7-21 percent, calcium oxide 2-5 percent, sulfur 0.25-0.5 percent and accelerant 0.65-1.5 percent. The invention ensures the mechanical performance and extrusion performance, is convenient for extrusion, adopts the hydrafil, the zinc borate, and a inflaming retarding system; is the most realistic non-halogen inflaming retarding; can produce a lot of crystal water on the surface of the burning substance; can separate the burning substance from contacting oxygen, and then can perform the inflaming retarding effect; can inhibit the gases produced by the burning substance, accordingly does not produce smog.

Open-cell foam of ethylene-propylene-diene rubber that can convert to open-cell foams at the foaming of EPDM, rather than after the foaming of the same, and can produce low impact resiliency and improved filling capability. After 0.1-40 parts by weight of organic foaming agent, 2-40 parts by weight of inorganic foaming agent, and 2-40 parts by weight of foam auxiliary agent per 100 parts by weight of ethylene-propylene-diene rubber are mixed, the mixture is vulcanized and foamed to thereby produce open-cell foam of ethylene-propylene-diene rubber. This open-cell foam of ethylene-propylene-diene rubber has low impact resilience and good sealing performance so that it can be used as sealing materials of a variety of industrial products.

The present invention relates to a tyre side rubber with perfect ozone resistance, thermo-oxidative ageing resistance and flex crack resistance, applying ethylene -propylene-diene rubber in single-layer huge full steel engineering tyre; the invention also relates to the full steel huge engineering tyre using the tyre side rubber. The full steel huge engineering tyre using the tyre side rubber of the present invention comprises usable sulfur and / or sulfur rubber mixture, the rubber mixture comprises: a. 10-30 parts by weight of ethylene -propylene-diene rubber; b. 50-90 parts by weight of caoutchouc; c. 0-20 parts by weight of butadiene rubber and / or styrene butadiene rubber; and the total content of the ethylene -propylene-diene rubber, caoutchouc, butadiene rubber and / or styrene butadiene rubber is 100 parts by weight compositions. The tyre side rubber produced according to the formula has perfect ozone resistance, thermo-oxidative ageing resistance and flex crack resistance, the rigidity of the rubber material of the tyre side rubber is 55-70 Shore A, the tension intensity is 15-25 Mpa, the flex crack resistance grade is less than or equal to 6 grade / 300000 times.

The invention relates to nylon engineering plastics and a manufacture method thereof, in particular to nylon engineering plastics for high-speed transit railway tracks and a manufacture method thereof. The nylon engineering plastics comprise the following components in percentage by weight: 35 to 60 percent of nylon resin, 20 to 35 percent of glass fibre, 0 to 10 percent of inorganic mineral, 16 to 30 percent of compatilizer, 0.3 to 0.5 percent of light stabilizer, 0.1 to 0.3 percent of coupling agent, 0.1 to 0.5 percent of antioxygen and 0.4 to 1 percent of lubricant, wherein the compatilizer is one kind of or a mixture of two kinds of Maleic anhydride grafted EPDM (Ethylene Propylene Diene Monomer) rubber and maleic anhydride grafted POE (Polyolefin Elastomer), and the melt flow rate of the compatilizer is 0.5 to 1.5g / 10min. The manufacture method comprises the steps of: adding the compatilizer into an extruder in a lateral feeding addition method under the condition that the melt temperature is 220 to 280 DEG C and the mixing time is 1-5min; and controlling the rotate speed of a screw between 300 and 450rpm. According to the invention, the tensile strength, the impact toughness and the size stability can all meet the requirements for the operation of high-speed trains with running speed more than 300km / h.

The invention provides a rubber sealing ring and a production method thereof. The rubber sealing ring is prepared from the following components of (by weight parts): ethylene propylene diene monomer (EPDM) 80-120, carbon black 55-75, paraffin oil 15-25, indirect process zinc oxide 4-6, stearic acid 0.2-1, anti-aging agent 2-4, sulfur S-80 0.1-0.35, vulcanizing agent dicumyl peroxide (DCP) 3-5, and lubricating agent 1-3. The production method comprises the steps of: synthesizing rubber with a Banbury mixer, forming the synthetic rubber with a mixing mill, first-stage vulcanizing in a mold of a vulcanizing device, second-stage the product from the first-stage vulcanization in an oven, trimming, testing, and storing. The inventive rubber sealing ring has improved tensile strength, extensibility, tear strength, self-lubrication effect, compression and deformation resistance, heat resistance and aging resistance, good medium resistance, and prolonged service life. The inventive production method is simple and reasonable.

A thermally-conductive interface interposable intermediate a first heat transfer surface and an opposing second heat transfer surface to provide a thermal pathway therebetween. The interface includes a thermally-conductive compound formed into a layer which is conformable between the first and second heat transfer surface. The compound is an admixture of: (a) a liquid resin constituent; and (b) a particulate filler constituent. The liquid resin constituent may be an ethylene-propylene copolymer (EPM) or a terpolymer (EPDM) of ethylene and propylene and a diene which may be ethylidene norbornene (ENB) or dicyclopentadiene (DCPD).

The invention discloses a high temperature resistance non halogen flame retardant cable sheath material and a preparation method thereof. The high temperature resistance non halogen flame retardant cable sheath material comprises the following components with the following parts by weight: 100 parts of ethylene-propylene-diene monomer (EPDM), 1.5-6 parts of vulcanizing agent, 1.5-6 parts of co-vulcanization agent, 0.5-5 parts of coupling agent, 4-20 parts of antiager, 4-30 parts of softener and 80-250 parts of inflaming retarding filling agent. In the invention, the halogen-free material is adopted, thick smoke, corrosive halogenide gas and other harmful substances are not generated in the process of burning; the cable sheath of the invention features excellent elasticity and tenacity, not only has obvious inflaming retarding effect, but also improves heat-resisting and anti-aging properties, can resist high temperature, and has high mechanical strength and wide application range; in addition, the production process is easy and is convenient for rubber-producing enterprises to achieve self-sufficiency.

The invention relates to a sponge rubber composition and a preparation method thereof. The sponge rubber composition is prepared from EPDM, a filling agent, an active agent, a plasticizing agent, a polarity addition agent, a vulcanizing agent, a promoting agent, a foaming agent and a moisture absorbing agent, wherein the active agent comprises zinc oxide, stearic acid and organic tellurium; and the organic tellurium is at least one of dipropyl tellurium, dibutyl tellurium, normal-butyl tellurium and methyl allyl tellurium. A sponge rubber prepared by the sponge rubber composition and the preparation method thereof can improve the production efficiency, and can solve the problem of corrosiveness of the sponge rubber at the same time.

The invention discloses an anti-folding stress whitening resistant polypropylene (PP) material and a preparation method thereof. The material is prepared from the following raw materials in part by weight: 55 to 75 parts of co-polypropylene, 5 to 20 parts of POE Lc670, 10 to 30 parts of stress whitening resistant master batch, 0.05 to 0.15 part of white mineral oil, 0.1 to 0.3 part of hindered phenol antioxidant 1010, 0.1 to 0.3 part of phosphite ester antioxidant 1680 and 0.1 to 0.3 part of calcium stearate. The stress whitening resistant master batch comprises the following components in part by weight: 40 to 65 parts of EPDM or EPR or POE, 30 to 50 parts of nano active light CaCO3, and 0.5 to 2 parts of sodium polyethylene with low molecular weight. The polypropylene (PP) material is prepared by using a double-screw extruder with 9 temperature control areas according to the specific process conditions. The material has the advantages of good repeated bending resistance and stress whitening resistance, simple preparation process and low preparation cost.

PCT No. PCT / CA94 / 00174 Sec. 371 Date Aug. 13, 1996 Sec. 102(e) Date Aug. 13, 1996 PCT Filed Mar. 28, 1994 PCT Pub. No. WO94 / 22957 PCT Pub. Date Oct. 13, 1994Two or more different polymeric materials are stably incorporated into bitumen by effecting steric stabilization of a polyolefin, such as polyethylene, and by dispersing the other polymer, such as a styrene-butadiene-styrene copolymer, an ethylene-vinyl acetate copolymer or an EPDM copolymer in the stabilized polyethylene-bitumen composition. The ability to incorporate different polymeric materials in bitumen permits desirable modifications to the properties of the composition to be effected. In addition, different properties can be attained by modifying processing parameters.

The invention discloses an ultraviolet cross-linking EPDM (ethylene propylene diene monomer) rubber cable insulation material and a preparation method thereof. The method is characterized in that: by weight, 100 portions of EPDM rubber, 100 portions to 120 portions of inorganic filling, 0.5 portion to 5.0 portions of ultrasonic initiator, 0.5 portion to 5.0 portions of polyfunctional cross-linking agent, 5.0 portions to 10.0 portions of softener, 0.8 portion to 1.2 portions of silane coupling agent and 0.01 portion to 1.0 portion of complex antioxidant are evenly mixed and extruded at the temperature of 100 DEG C to 150 DEG C, thereby obtaining the ultraviolet cross-linking EPDM rubber cable insulation material; then the wire core is fused and extruded coating to form an insulation layer or a protective coating; and ultraviolet cross linking is carried out under 200nm to 400nm of wave length and 400mW / cm<2> to 2000mW / cm<2> of light intensity. The cable insulation material has tensile strength of larger than 6.5MPa, elongation at break of higher than 300 percent and volume resistivity of higher 10<12>Omega question mark cm, and can pass a thermal aging test under the temperature of 135 DEG C for 168h.

The invention discloses a manufacturing method for a manual patch of a heat insulating layer of a filament winding engine shell. By controlling the preparation environment of the manual patch, an appropriate adhesive is selected, a multilayer patching method is adopted to reduce the film thickness of a single-layer manual patch and patch size, then a fiber yarn is used for preloading pressure, and the heat insulating layer is repaired to increase the internal mass and shape structure size of the heat insulating layer after curing, thus manufacturing the manual patch. The manufacturing method solves the problems of high film hardness, poor self-adhesion and mutual viscosity, and high patching difficulty of an EPDM material, the thickness of the heat insulating layer meets the design requirements, and an EPDM anatomical layer is compact and smoothly passes engine ground test assessment for a few times.

A rubber mixture, comprising (A) at least one rubber selected from the group of ethylene-propylene-diene copolymer (EPDM), ethylene-propylene copolymer (EPM), chloroprene rubber (CR), chloropolyethylene (CM), chloro-isobutene-isoprene (chlorobutyl) rubber (CIIR), chlorosulfonyl polyethylene (CSM), etylene-vinyl acetate copolymer (EAM), alkyl acrylate copolymer (ACM), polyester polyurethan (AU), polyether polyurethane (EU), bromo-isobutene-isoprene (bromobutyl)rubber (BIIR), polychlorotrifluoroethylene (CFM), isobutene-isoprene rubber (butyl rubber, IIR), isobutene rubber (IM), polyisoprene (IR), thermoplastic polyester polyurethane (YAU), thermoplastic polyether polyurethane (YEU), silicone rubber with methyl groups on the polymer chain (MQ), hydrogenated acrylonitrile-butadiene rubber (HNBR), acrylonitrile-butadiene rubber (NBR) or carboxylated acrylonitrile-butadiene rubber (XNBR), (B) at least one oxidic filler, and (C) at least one silicon containing azodicarbamide of the general formula I (R 1 ) 3-a (R 2 ) a Si-R I -NH-C(O) -N=N-C (O)-NH-R I -Si(R 1 ) 3-a (R 2 ) a (I) . The rubber mixture is produced by mixing at least one rubber, at least one oxidic filler, and at least one silicon containing azodicarbamide of the general formula I. It may be used for moldings.

Highly branched compositions including: (i) from about 96 wt % to about 99.9 wt % metallocene catalyzed ethylene propylene diene derived units; and (ii) from about 0.1 wt % to about 4 wt % multifunctional monomer derived units, wherein the highly branched composition has: (a) a Mooney viscosity ML (1+4) at 125° C. of about 30 to 100 MU, (b) a Mooney relaxation area MLRA of about 100 to about 1000, (c) a branching index, g′(vis) of less than about 0.9, (d) a phase angle, δ, of less than about 55 degrees at a complex modulus of 10 kPa, measured at 190° C., and (e) a degree of shear thinning greater than about 0.95, measured at 190° C., are disclosed herein. Homogeneous blends including this composition are also described. Processes to make the highly branched composition and the homogeneous blend are also described herein.

Power cable coating compounds are disclosed, the coating compounds including an ethylene alpha-olefin diene elastomeric terpolymer, and an ethylene alpha-olefin copolymer having a Melt Index Ratio I10 / I2 of at least 7 and / or a Melt Index Ratio I21 / I2 of at least 20. In various embodiments, the ethylene alpha-olefin copolymer can be present in the coating compound in amounts up to 90 percent by weight, based on the weight of the ethylene alpha-olefin diene elastomeric terpolymer and the ethylene alpha-olefin copolymer. Also disclosed are electrical devices including extruded coating compounds, the extruded compounds having low surface roughness at high extrusion rates.

A lap edge sealant composition is provided for adhering together overlapping sheets of roofing material which includes a rubbery polymer such as EPDM, a thermoplastic rubber, a tackifier, and a solvent, where the solvent is selected from aliphatic hydrocarbons, para-chlorobenzotrifluoride, or blends thereof. The lap edge sealant has a high solids content of about 65 to 90%, a volatile organic compound (VOC) content of less than about 250 g / l, and exhibits no more than about 35% shrinkage upon curing.

The invention discloses a super wear-resistant rubber foamed sport shoe material comprising the components of ethylene-vinyl acetate copolymer, plastic styrene-butadiene rubber (TVA), ethylene propylene diene monomer (EPDM), hydrogenated styrene-butadiene-styrene block copolymer (SEBS), a wear-resistant agent, talc powder, stearic acid, zinc stearate, zinc oxide, dicumyl peroxide (DCP) and azodicarbonamide. The invention also discloses a preparation method of the super wear-resistant rubber foamed sport shoe material. The super wear-resistant rubber foamed sport shoe material disclosed by the invention is good in slip resistance, the wear resistance of the sport shoe material is superior to that of common hard rubber, and the sport shoe material can be directly molded by ejecting. The invention also discloses a preparation method of the super wear-resistant rubber foamed sport shoe material, wherein physical parameters are strictly controlled during preparation to ensure that the prepared super wear-resistant rubber foamed sport shoe material has more excellent wear resistance and slip resistance.

The invention discloses a large high-pressure seamless rubber airbag and a production process thereof, relating to a rubber product and a production process thereof. The large high-pressure seamless rubber airbag comprises the following compositions: EPDM (ethylene-propylene-diene monomer) externally-covered rubbers with excellent weather resistance, at least four (even number) skeleton layers, a middle adhesive layer and an inner adhesive layer, wherein each skeleton layer is composed of continuous high-strength tyre cords which are mutually crossed with an angle of 90 degrees and formed into an angle of 46-56 degrees, the middle adhesive layer is composed of chloroprene rubbers and natural synthetic rubbers, and the inner adhesive layer is made of butyl rubbers with excellent air tightness. The production process of the large high-pressure seamless rubber airbag comprises the following steps: (1) sequentially carrying out plastication, coordination, mixing and batching on raw rubbers; (2) carrying out impregnation and rubberizing on the high-strength tyre cords; (3) carrying out rotating preforming on the obtained object by using a roller; weaving open-end fibers, so that the joints of the fibers are arranged in a continuous shape, and sticking films on the fibers; (4) carrying out integral molding on the obtained object once; (5) carrying out integral vulcanization on the obtained object; and (6) carrying out reinforced heat vulcanization on edges and corners of the obtained product. The production process disclosed by the invention is simple and convenient in operation; the service time of the rubber airbag is more than 50 years, and the environmental sanitation index of the rubber airbag exceeds four orders of magnitude of the international standard requirement. The large high-pressure seamless rubber airbag and production process disclosed by the invention are used for the hoisting of pneumatic-shield gate dams and heavy objects.

An environment protective and water penetrative plastic trick involves a polymer material, consisting of adhesive, pigment for spraying adhesive, catalyst for carboxylic salt, black waste rubber granules, and color EPDM granules. It is constructed by: making mono-component polyurethane as primary agent to bind recovered rubber granules; mixing with catalyst and stirring uniformly; mechanically spreading; curing at atmosphere - 70 deg.C to form a plastic layer with thickness of 4 - 10mm; and then spreading well-mixed polyurethane adhesive, color EPMD granules and catalyst to form a top plastic layer, finally curing to form the said trick with a plastic layer and a cement substrate. The construction are not only available for tricks, but also for other pavements with low cost, high strength, large extension rate, and good penetration. It can be constructed mechanically and effectively with good flatness.

The invention discloses an EPDM cold shrinking power cable adjunct and a preparation method thereof. In order to overcome the defects that the power cable adjunct made of silicon rubber material has deficient acidity, alkalinity, abrasive resistance and moisture resistance and has high manufacturing cost, the invention provides an EPDM cold shrinking power cable adjunct which mainly comprises the materials, such as EPDM, zinc oxide, stearic acid, carbon black, filler, peroxide and the like. The invention also provides a method for preparing the EPDM cold shrinking power cable adjunct by using the materials through the working procedures, such as plastifying, mixing, shaping, vulcanizing, expanding built-in supporting tubes and the like. The EPDM cold shrinking power cable adjunct prepared by the invention has favourable acid resistance, alkali resistance, abrasive resistance and moisture resistance and can greatly lower the manufacturing cost of the product.

The invention discloses a high-performance EPDM (Ethylene-Propylene-Diene Monomer) / PP(Polypropylene) / NBR(Nitrile-Butadiene Rubber) ternary blending dynamic vulcanized thermoplastic elastomer and a preparation method thereof. The high-performance EPDM / PP / NBR ternary blending dynamic vulcanized thermoplastic elastomer comprises the following components in percentage by weight: 20-50 percent of ethylene-propylene-diene monomer, 20-50 percent of polypropylene, 10-20 percent of nitrile-butadiene rubber, 2-30 percent of rubber oil, 2-5 percent of compatilizer, 3-6 percent of phenolic resin, 0.4-0.6percent of stannous chloride, 0.2-0.6 percent of weather-resistant agent, 0.2-0.6 percent of heat stabilizer and 0.5-1 percent of lubricating agent. The prepared high-performance EPDM / PP / NBR ternary blending dynamic vulcanized thermoplastic elastomer not only has the characteristics of oxidation resistance, ozone resistance, high mechanical property, easy forming and the like of the traditional TPV (Thermoplastic Vulcanizate), but also has favorable oil resistance, wear resistance and airtightness.

The invention relates to an ethylene-propylene-diene monomer(EPDM) rubber heat-insulating material with a ceramifiable ablation carbon layer, which is composed of 100 of EPDM, 5-50 of strengthening agent, 5-15 of organic fiber, 8-15 of tackifying resin, 4-15 of plasticizer, 8-20 of fire retardant and 3-12 of other auxiliary agent. According to the invention, a low melting point silicate substance such as montmorillonite and mica powder is introduced in an EPDM heat-insulating material formula, by using the characteristics of meltable performance at high temperature, a viscous liquid is generated for bonding the cracked carburization zones through physical crosslinking effect, and thereby a large solid particle network structure is formed, capability of the carbon layer for resisting volatilization internal stress of pyrolysis gas and erosion external stress of gas flow can be enhanced, denudation and shedding of the carbon layer can be reduced, and performances of anti-ablation, anti-erosion and characteristic signal transmitance of the EPDM heat-insulating material can be effectively increased. The heat-insulating material can be used for inner heat insulation of an engine and also can be widely used for producing ceramifiable wire and cable compounds and other places which requires fireproofing flame retardation.

The invention relates to a lightweight wear-resistant density-gradient foamed sole material and a preparation method thereof. The lightweight wear-resistant density-gradient foamed sole material is mainly composed of EPDM, ethylene-octene copolymer, low density polyethylene, a cross-linking agent, a filling material, a foaming agent and a foaming promoter. On the basis of foaming of EPDM, POE and LDPE and through control of a foaming ratio and density difference values of each layer of materials, a heterogeneous expandable rubber compound composed of a plurality of layers and having quasi-continuously changing performances in the thickness direction of the materials are subjected to one-shot mould pressing, foaming and moulding so as to prepare the foamed sole material, and function gradient differences of density, hardness and wear resistance are realized. Due to gradual change of density, stress concentration is mitigated, and the prepared foamed sole material does not warp. The foamed material has low density at one side close to the vola while the foamed material has high density at one side close to the outer sole, so the foamed sole material has good wear resistance, reduces the weight of the sole and has improved wearing comfortableness.

A hose has at least the following layer structure: an inner layer made of an amine-bonded rubber mixture having media-resistance properties and an adhesion layer of a peroxide-bonded rubber mixture lying on the external side of the inner layer. The inner layer and the adhesion layer form an adhesive bond. The inner layer includes a rubber mixture based on unblended AEM or an AEM blend or on unblended ACM or an ACM blend and the adhesion layer includes a rubber mixture based on EPM or EPDM, each of which are unblended. The hose often includes a strengthening support layer and an external layer of a rubber mixture having resistance to external influences. The external layer preferably includes a peroxide-bonded rubber mixture based on unblended EPM or an EPM blend or on unblended EPDM or an EPDM blend.

Breakage in a coupling portion of a side plate subjected to repeated flexure is prevented by using fatigue resistant resin materials in the side plate. The coupling portion of the side plate due is subjected to repeated flexure. Excellent fatigue resistance is realized. The fatigue resistant resin material is selected from the group of an elastomer- or rubber component- compounded polyamide resin and polybutylene terephthalate resin. The rubber component is selected from the group of ethylene-propylene rubber (EPDM), nitrile rubber (NBR) and butyl rubber (IIR).