48results about How to "Excellent compression set resistance" patented technology

Provided is a rubber composition, which has excellent heat resistance, acid resistance, gas permeability resistance, and high-speed moldability, has low hardness and low counterforce, has excellent high-temperature compression set, and does not adhere to the metal of molds, etc. but is self-adhering with respect to organic resins. The rubber composition comprises: a predetermined ethylene / a-olefin / non-conjugated polyene copolymer [A]; a predetermined SiH group-containing compound [B-1] having two SiH groups per molecule and / or a predetermined SiH group-containing compound [B-2] having three SiH groups per molecule; and a predetermined methacrylic acid ester compound [C].

The invention discloses a casting polyurethane elastomer as well as a preparation method and an application thereof. The casting material is composed of a component A and a component B with a mass ratio of 100 / (8-12), wherein the component A is composed of TODI, macromolecule polyalcohol and a catalyst and the component B is composed of a diamine chain extender and a three-functionality micromolecule alcohol chain extender. The TODI and the macromolecule polyalcohol are added to a reactor to be stirred and mixed; then, a reaction is carried out on the mixture for 1.5-2.5 hours at a temperature of 75-95 DEG C to obtain a prepolymer; the prepolymer is heated to 70-90 DEG C, the chain extender component is heated to 110-130 DEG C, the prepolymer and the chain extender component are mixed, stirred, degassed and cast into a mould with a temperature of 90-120 DEG C; the mould is demoulded after 20-40 minutes of curing at a temperature of 90-120 DEG C; and the demoulded product is cured for 16-24 hours at a temperature of 90-110 DEG C. The elastomer is suitable to serve as a sealing element for a medium high-pressure hydraulic system, a sealing element for a pneumatic system and high-performance roller wheels and rubber covered rollers.

Provided is a nitrile rubber composition which contains: a carboxyl group-containing nitrile rubber (A); liquid nitrile rubber (B); and a polyamine cross-linking agent (C). The iodine value of the carboxyl group-containing nitrile rubber (A) in this nitrile rubber composition is preferably 120 or less. Furthermore, the carboxyl group-containing nitrile rubber (A) in this nitrile rubber composition preferably contains: 5-60 mass% of an α,β-ethylenically unsaturated nitrile monomer unit; 0.1-20 mass% of a carboxyl group-containing monomer unit; and 15-94.9 mass% of a conjugated diene monomer unit.

The invention relates to a plastic water pipe material. The plastic water pipe material comprises the following components in parts by weight: 30-60 parts of styrene thermoplastic elastomer, 45-60 parts of mineral oil, 5-15 parts of polyolefin, 5-15 parts of polyolefin thermoplastic elastomer, 0.1-5 parts of lubricant, and 0.1-0.5 part of antioxidant. The invention also provides a preparation method for the plastic water pipe material. The styrene thermoplastic elastomer is taken as base material, and is fully mixed with the polyolefin thermoplastic elastomer and other raw materials so as to obtain the plastic water pipe material, the styrene thermoplastic elastomer has good weather fastness, heat resistance and compression deformation resistance, the polyolefin thermoplastic elastomer has narrow relative molecular mass distribution and uniform short branched chain distribution, and the styrene thermoplastic elastomer and polyolefin thermoplastic elastomer are mixed with other materials, so that the product has good plasticity and is stably extruded, the tear strength, tensile strength and elongation at break of the plastic water pipe material are improved, and the plastic water pipe material has excellent elasticity.