172results about How to "Small compression set" patented technology

The invention belongs to the technical field of foaming material preparation and discloses an environment-friendly sulfur-free foaming material as well as a preparation method and application of the environment-friendly sulfur-free foaming material. The environment-friendly sulfur-free foaming material comprises the following ingredients in parts by weight: 100 parts of ethylene propylene diene rubber, 0.5 to 2.5 parts of vulcanizing agents, 0.3 to 3 parts of vulcanization accelerators, 3 to 15 parts of foaming agents, 1 to 5 parts of foaming auxiliary agents, 0.5 to 100 parts of plasticizers and 20 to 200 parts of reinforcement fillings. The environment-friendly sulfur-free foaming material adopts environment-friendly raw materials and conforms to the environment protection requirement of China; and the vulcanizing agents are used, the materials can form single C-C crosslink bonds, the foaming material with excellent performance is obtained through preparation, excellent heat resistance and ageing resistant performance are realized, the compression permanent deformation is little (12 percent), and the elongation at break (246 percent) is equivalent to that of a sulfur vulcanizing system foaming material.

The invention discloses ethylene propylene rubber with high temperature resistance and low compression deformation, which is prepared from the following raw materials in mass part: 30-80 parts of ethylene propylene rubber, 70-20 parts of ethylene propylene terpolymer rubber, 1-3 parts of anti-aging agent, 2.5-5 parts of phenolic resin, 5-8 parts of zinc oxide, 2.5-5 parts of white carbon black, 50-80 parts of carbon black N550, 45-90 parts of carbon black N774, 10-20 parts of paraffin oil, 1-3 parts of Rhine wax, 1-2 parts of polyethylene glycol, 0.5-1 part of stearic acid, 2-4 parts of cross-linking agent, 2 parts of cross-linking addictive and 0.2-0.5 part of accelerating agent. According to the invention, the ethylene propylene rubber and the ethylene propylene terpolymer rubber are used in combination, and co-vulcanization is performed to the ethylene propylene rubber and the ethylene propylene terpolymer rubber by means of adjusting a vulcanization system, so that the requirement for high temperature resistance can be met and the rubber can obtain lower compression permanent deformation; and moreover, the highest use temperature of the ethylene propylene rubber vulcanized by the vulcanization system can achieve 150 DEG C, can resist the temperature of 175 DEG C in short-time or intermittent use, and has good heat resistance, chemical stability and lower compression deformation.

The invention relates to a neoprene foaming board and a preparation method thereof. The neoprene foaming board is prepared by the following materials according to weight parts: 100 portions of neoprene, 15 portions to 200 portions of kaolin or calcium carbonate, 15 portions to 45 portions of carbon black, 10 portions to 20 portions of a vulcanizing agent, 0 portion to 2 portions of an accelerant, 5 portions to 15 portions of a vesicant, 0 portion to 5 portions of urea resin, 1 portion to 4 portions of olefin, 0 portion to 3 portions of dilauryl thiodipropionate, 0 portion to 2 portions of 2, 2'-methylene-bis(4-methyl-6- tert-butylphenol), 0 portion to 1 portion of nickel dibutyldithiocarbamate, 0 portion to 2 portions of stearic acid, 8 portions to 30 portions of black factice, 0 portion to 4 portions of vaseline, 10 portions to 20 portions of naphthenoid oil, 20 portions to 40 portions of perfume oil, and 1 portion to 4 portions of a dispersant. The preparation method thereof includes the steps of first-time mixing of a pressurizing milling machine, first-time mixing of a mixing mill, second-time mixing of the pressurizing milling machine, second-time mixing of the mixing mill, extrusion of an extruder, first-time foaming vulcanization, second-time foaming vulcanization, cooling and the like. The neoprene foaming board and the preparation method have the advantages of good flame resistance, high tensile strength, high extensibility, good performance of tear resistance, small compression set, good abrasion resistance and skidproof effect, good effect of shock absorption and the like.

A conductive elastomer composition having rubber-like elasticity and flexibility and thermoplastic-resin-like moldability and realizing a high conductivity. The conductive elastomer composition includes a thermoplastic elastomer composition (A) containing a compound (A1) composed of a thermoplastic resin and / or a thermoplastic elastomer and a compound (A2), composed of a crosslinkable rubber and / or a crosslinkable thermoplastic elastomer, dispersed in the compound (A1) by dynamically crosslinking the compound (A2); and an ionic-conductive agent (B), containing a metal salt and a polyether-containing block copolymer resin, dispersed in the thermoplastic elastomer composition (A). The conductive elastomer composition may contain carbon black (C).

An object of the present invention is to provide a novel ethylene-α-olefin copolymer excellent in crosslinking properties; a foamed molded article having a low specific gravity and a low compression set (CS) and a composition capable of producing the foamed molded article, footwear parts composed of a foamed molded article; an ethylenic copolymer composition excellent in balance between weather resistance and mechanical strength, and an electric wire coating material and an electric wire sheath using the ethylenic copolymer composition; and a thermoplastic elastomer capable of producing a molded article excellent in balance between mechanical strength and toughness. The ethylenic copolymer (A) of the present invention is a copolymer composed of only ethylene and an α-olefin having 3 to 20 carbon atoms, and is characterized in that vinyl-group content (a) per 1000 carbon atoms as measured by infrared absorption spectroscopy, MFR10 / MFR2.16 (b), and the specific gravity (c) are within a specific range.

The invention discloses a silicone rubber technology, and particularly relates to a low-compression set silicone rubber and a preparation method thereof. The low-compression set silicone rubber comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber, 30-70 parts of white carbon black, 2-15 parts of a structurized control agent, 0.1-5 parts of a heat-resistant auxiliary agent, 0.2-2 parts of a vulcanizing auxiliary agent, 0.2-1.5 parts of a silane coupling agent and 0.05-1 part of a demoulding agent. After the adoption of the formula and the preparation method, through reasonable cross-linking structure design and addition of the vulcanizing auxiliary agent, the slippage of a molecular chain of a polymer is reduced; through addition of the heat-resistant auxiliary agent, oxidation and degradation of the polymer at high temperature are prevented; moreover, through a multistage heating mixing process, uniform treatment and dispersion of the white carbon black are achieved; the obtained silicone rubber has relatively low compression set and relatively good mechanical properties.

The invention belongs to the technical field of rubber materials, particularly a rubber material for weather-resistant and aging-resistant plate type rubber support. The rubber material comprises the following components: rubber type chlorinated polyethylene (CM), natural rubber, zinc oxide, stearic acid, magnesium oxide, an antiaging agent, paraffin, carbon black, modified nano attapulgite, a plasticizer, an organic peroxide vulcanizing agent, sulfur and an accelerant. The rubber material for weather-resistant and aging-resistant plate type rubber support can be prepared by virtue of the steps: plastifying, mixing, vulcanizing and the like, wherein the rubber material has the characteristics of being high in mechanical strength, strong in weather resistance, heat aging resistant, ozone aging resistant and the like.

The invention provides an ethylene propylene diene monomer (EPDM)-based sealing part and a preparation method thereof. The ethylene propylene diene monomer-based sealing part is prepared from the following components in parts by weight: 100 parts of EPDM, 0.3 to 1 part of stearic acid, 3 to 8 parts of zinc oxide, 1 to 4 parts of an anti-ageing agent, 40 to 60 parts of white carbon black, 20 to 40parts of inorganic filling, 0.5 to 2 parts of carbon black, 1 to 3 parts of a dispersant, 2 to 4 parts of polyethylene glycol, 2 to 5 parts of a silane coupling agent, 2 to 4 parts of triallyl isocyanurate and 2 to 5 parts of a vulcanizing agent. According to the ethylene propylene diene monomer-based sealing part provided by the invention, a mass ratio of all the components is strictly controlledso that the cross-linking density of a rubber material is increased and a sealing part product keeps relatively high physical and mechanical performance; meanwhile, the permanent compression deformation is reduced; the ethylene propylene diene monomer-based sealing part has excellent insulating performance and airtight performance and has relatively small deformation under high temperature; the ethylene propylene diene monomer-based sealing part has the prominent advantages of simple preparation method, easiness for operation, low implementation cost and the like.

The invention relates to the technical field of automobile shock absorbers, and discloses an automobile shock absorber bushing which comprises the following raw materials by weight: 65-75 parts of natural rubber, 25-35 parts of polynorbornene rubber, 10-25 parts of high abrasion furnace black, 45-55 parts of carbon black N660, 1-4 parts of a promoter, 2-8 parts of zinc oxide, 1-6 parts of paraffin wax, 1-5 parts of an antioxidant, 1-5 parts of a dispersing agent, 3-8 parts of aromatic oil, 1-5 parts of a curing agent, 1-5 parts of a plasticizer and 1-5 parts of a coupling agent. Through simultaneous use of the natural rubber and the polynorbornene rubber, the heat resistance of products is excellent, by simultaneous use of the high abrasion furnace black and the carbon black N660, aging resistance and bending fatigue resistance of the rubber reinforcing system are excellent, the service life is longer, compression permanent deformation is small, rubber tensile strength is high, rebound elasticity is excellent, and the compression permanent deformation is small.