264results about How to "Improved compression set" patented technology

An electrically conductive silicone composition comprising an electrically conductive filler; organopolysiloxane mixture comprising a catalyst which promotes the addition of Si-bonded hydrogen onto alkenyl multiple bonds; an organopolysiloxane having at least two alkenyl groups per molecule; an organopolysiloxane having at least two silicon-bonded hydrogen atoms per molecule; optionally, a fluid organopolysiloxane having a viscosity less than about 1000 centipoise; and optionally, an organopolysiloxane gel formulation, the composition, when cured, having a Shore A Durometer hardness of less than or equal to about 60 measured according to ASTMD-2240 and an electrical resistivity of less than or equal to about 10-6 ohm-cm.

Embodiments disclosed in the detailed description include a unitary or monolithic composite or hybrid cushioning structure(s) and profile(s) comprised of a cellular thermoplastic foam and a thermoset material. The thermoset material may also be provided as cellular foam as well. In one embodiment disclosed herein, the unitary composite cushioning structure is formed from a cellular thermoplastic foam and a thermoset material. The cellular thermoplastic foam provides support characteristics to the unitary composite cushioning structure. The thermoset material provides a resilient structure with cushioning characteristics to the cushioning structure. A stratum is disposed between at least a portion of the cellular thermoplastic foam and at least a portion of the thermoset material to secure the at least a portion of the thermoset material to the at least a portion of the cellular thermoplastic foam to provide a unitary composite cushioning structure.

The invention provides an SEBS (styrenic block copolymer) thermoplastic elastomer. The SEBS thermoplastic elastomer comprises the following constituents in parts by weight: 30-40 of SEBS resin, 3-19 of polypropylene, 20-48 of mineral oil, 3.5-8 of carbon hydrogen monomer resin, 5-35 of a filler and 0.05-0.2 part of an antioxygen. The invention also provides another SEBS thermoplastic elastomer. The SEBS thermoplastic elastomer comprises the following constituents in parts by weight: 25- less than 30 of the SEBS resin, 3-19 of the polypropylene, 20-48 of the mineral oil, 3.5-8 of the carbon hydrogen monomer resin, 3-6 of the thermoplastic, 5-35 of the filler and 0.05-0.2 part of the antioxygen. According to the invention, the SEBS thermoplastic elastomer provided by provided by the invention has good compression set, simultaneously has excellent mechanical properties, and has wide application range. In addition, the invention also provides a preparation method of the SEBS thermoplastic elastomer, and the preparation method has the advantages of simple technology, small energy consumption and high efficiency, and is easy to operate and repeat.

The invention relates to a silicon rubber / polyurethane rubber composite hydraulic sealing gasket and a preparation method thereof. The silicon rubber / polyurethane rubber composite hydraulic sealing gasket is prepared from methylvinylsiloxane rubber, polyether based polyurethane rubber, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, diphenyl silanediol, hexamethyldisilazane, gas-phase white carbon black, modified wollastonite and the like. The methylvinylsiloxane rubber, which has the advantages of excellent heat resistance, excellent freezing resistance, excellent ozone resistance, excellent atmospheric aging resistance and small permanent compression set, and the polyurethane rubber with favorable mechanical properties are compounded and blended, so that the respective advantages are displayed, thereby enhancing the sealing property of the sealing material; and in the blending process, the organically / inorganically modified wollastonite is added to obviously improve the dispersity of the wollastonite in the rubber, thereby enhancing the mechanical strength, oil resistance, wear resistance, high temperature resistance and other properties of the sealing material.

The invention relates to the technical field of a foam material, in particular to a thermoplastic elastomer foam material and a preparation method thereof. The thermoplastic elastomer foam material consists of following raw materials in parts by weight: 20 to 30 parts of styrene-ethylene butylene-styrene (SEBS), 20 to 30 parts of white mineral oil, 25 to 35 parts of calcium carbonate, 3 to 8 parts of ethylene vinyl acetate (EVA), 1 to 5 parts of polyolefin elastomer (POE) and 0.1 to 0.5 parts of zinc stearate. Multiple raw materials such as calcium carbonate, EVA and POE are selected to be matched with the SEBS to use, so that the prepared foam material is not only low in cost and good in abradability and compression deformation, but also other physical indexes such as hardness, elasticity and the like are improved. The preparation method is simple in process and low in cost.

An improved process is provided for the preparation of siloxane-oxyalkylene and siloxane-alkyl copolymer compositions via a hydrosilation reaction in the presence of high boiling point natural vegetable oils as the reaction solvent. The reaction solvent need not be removed from the block copolymer product, and indeed is beneficial to remain with the copolymer particularly when the copolymer is used as a surfactant for polyurethane foam formulations. Soybean oil and linseed oil are the preferred high boiling natural oil solvents when the copolymer product is to be used in the preparation of the surfactants for polyurethane foams. High resiliency polyurethane foam prepared with these natural oils present in the surfactant preparation afforded improved compression sets, wet compression sets and humid aged compression sets. Additionally, the use of the surfactants made with natural oils as a reaction solvent or consequently surfactants post diluted with natural oils when employed in the preparation of polyurethane foam afforded foams with greatly reduced amounts of "glass fogging".

The invention discloses an elastomer-based insulating cladding material for a charging pile cable and a preparation method of the elastomer-based insulating cladding material. The insulating claddingmaterial is prepared from the following raw materials in parts by mass: 100 parts of halogen-containing polyolefin, 35-85 parts of a small-molecule plasticizer, 15-45 parts of a polymeric plasticizer,30-80 parts of a toughening modifier, 10-25 parts of a flame-retardant compatible agent, 3-9 parts of a flame retardant, 3-9 parts of a lubricant, 5-25 parts of a heat stabilizer, 3-9 parts of an antioxidant, 3-9 parts of an ultraviolet stabilizer, 3-9 parts of a smoke suppressant and 15-45 parts of filler. The preparation method of the elastomer-based insulating cladding material is simple, thematerials are mixed uniformly and subjected to melting mixing and extrusion pelletizing, and the insulating cladding material can be obtained. The elastomer-based insulating cladding material for thecharging pile cable has the excellent properties of high and low temperature resistance, solvent extraction resistance, tear resistance, heat resistance, weather resistance, aging resistance and the like, and has advantages of high strength, high toughness, excellent flame retardancy and insulation performance and low smoke; the preparation process is simple, and the preparation cost is low.

The invention provides a preparation method of modified vinylene chloride plastics, which comprises the following steps: (1) weighing raw materials; (2) mixing prepared materials, namely adding polrvinyl chloride resin powder into a mixing mill, preheating, adding a plasticizer and a stabilizer, mixing to 85 to 90 DEG C, adding other aids, heating to 100 to 135 DEG C, and mixing at a high speed of 1,300r / min to obtain a mixed material; (3) performing extrusion forming, namely placing the mixed material in a double-screw extruder, initially melting, and plasticizing to obtain a completely plasticized material; and (4) granulating, air cooling, sieving, cooling and discharging products. In the method, the process is simple, the conditions are easy to control, and large-scale production is easy. In addition, the invention also provides modified vinylene chloride plastics, which have the characteristics of high wear resistance, high scraping resistance, high flame retardance, high ultraviolet resistance, soft handfeel, adhesion prevention, and the like, and can be used as coating materials for wires and cables.

The invention relates to a preparation method for a novel rubber strip for sealing of automobile doors and windows and a product. The preparation method employs ethylene propylene diene monomers as basic materials with cooperation of certain amounts of carbon black, calcium carbonate, paraffin oil, zinc oxide, stearic acid, polyvinyl alcohol, high-molecular wax, compound antioxidants, dispersants, compound accelerants, vulcanizing agents, fire retardants and the like. The above materials are subjected to mixing, open milling and vulcanization technologies to obtain the rubber strip. The preparation method has advantages of simple formula, simple production technology, short vulcanizing time, high production efficiency, relatively low production cost, easy industrialization enforcement and the like. The rubber product for sealing is advantaged by good sealing performance, uniform structure, resistance to corrosion, resistance to high and low temperature, flame resistance, environment protection and comfort.

The invention relates to a rubber composition capable of resisting expansibility of synthetic brake fluid of a motor vehicle. The composition comprises the following components: ternary ethylene propylene diene monomer with low mooney viscosity, liquid ethylene propylene diene monomer, magnesium oxide, magnesium oxide, age resister MB, age resister 4010NA, fast extruding carbon black N550, high-modulus semi-reinforcing carbon black N774, kieselguhr, low-molecular-weight polyisobutylene PB1300, cross-linking agent DCP, assistant cross-linking agent TMPT and sulphur. Due to the utilization of the composition, the hardness change after thermal ageing (150 DEG C*168h) is +6.8 Shore A, the compression set (140 DEG C*24h*25 percent) is 29 percent, the volume expansion change rate in DOT4 brake fluid (70 DEG C*72h and 120 DEG C*72h) is 0.86 percent and 1.02 percent, a sample and a packing leather are soaked in the DOT4 brake fluid for 72h at temperature of 120 DEG C, the expansion change rate of the end diameter and the lip diameter of the packing leather is within 3.0 percent, and the expansion change rate of the end diameter and the lip diameter of the packing leather after resisting the brake fluid in a pipe is within 2.5 percent. The composition provided by the invention can meet the requirement of compatibility of the rubber in the brake fluid of a GB12981-2003 motor vehicle andthe requirement of change rate of the end diameter and the lip diameter of the rubber after resisting the brake fluid in an HG2865-1997 motor vehicle.