3results about How to "Permanent deformation" patented technology

The invention discloses a high-resilience eTPU foaming material and a preparation process thereof, and belongs to the technical field of foaming materials. The process comprises the steps of raw material premixing and TPU chain extension reaction, precursor system injection, in-situ phase change energy storage core-shell particle generation, supercritical two-fluid foaming and molding post-treatment. Wherein the SiO2-coated TiO2 core-shell particles are prepared by a non-hydrolytic sol-gel method, the porous SiO2 core adsorbs and fixes the micro-crosslinked polyurethane-based phase change material, the TiO2 shell provides sealing and supporting, the particles are combined with the TPU matrix through covalent bonds, and the micro-crosslinked polyurethane-based phase change material has a unique micro-crosslinked network structure, so that the thermal conductivity of the TPU matrix is improved, and the thermal conductivity of the TPU matrix is improved. The hidden danger of leakage of the phase change material in the using process can be effectively eliminated, and meanwhile the interface bonding effect between the inorganic particles and the TPU matrix is synchronously enhanced. The eTPU foaming material prepared by the invention has the characteristics of high resilience, strong interface bonding, excellent energy storage stability and low compression set, and is suitable for shoe materials, automotive interiors and other scenes.

This invention relates to the field of rubber materials technology. It provides a high-strength, low dynamic ratio EPDM rubber material and its preparation method. The raw materials for the EPDM rubber material, by weight, include: 140-200 parts of EPDM raw rubber, 70-80 parts of filler, 5-40 parts of plasticizer, 2.0-3.0 parts of antioxidant, 1.0-3.0 parts of processing aid, 0.3-0.8 parts of vulcanizing agent, 3.0-4.0 parts of accelerator, 4-6 parts of zinc oxide, and 1.0-2.0 parts of stearic acid. The EPDM raw rubber is oil-extended EPDM rubber, with an oil content of 40-100 parts. This invention provides a high-strength, low dynamic ratio EPDM rubber material with high strength and low dynamic ratio, significantly improving the NVH performance and service life of the product. It can meet the functional requirements of current new energy vehicles for vibration damping rubber products, such as vibration reduction, noise reduction, high load-bearing capacity, and high durability.

The present application relates to the technical field of rubber sealing material, and particularly relates to a modified fluorine rubber, a preparation method thereof and a semiconductor sealing assembly. The preparation method provided by the present application comprises the following steps: mixing vinylidene fluoride, hexafluoropropylene, tetrafluoroethylene, long-chain modified flexible monomers and vulcanization point monomers in a predetermined proportion to obtain mixed monomers; mixing the mixed monomers, a solvent and a fluorine-containing surfactant, and then performing first stirring treatment to obtain a monomer pre-emulsion; mixing the monomer pre-emulsion, an additive and the solvent, and then performing second stirring treatment to obtain a product to be treated; placing the product to be treated at a first temperature, heating to a second temperature under predetermined conditions, and then performing reaction to obtain a reaction product; recovering the mixed monomers that do not participate in the reaction in the reaction product, adding a magnesium nitrate aqueous solution, performing third stirring treatment, and then drying to obtain the modified fluorine rubber. Under the premise of maintaining the excellent chemical resistance of the fluorine rubber, the present application significantly improves the elastic recovery performance of the fluorine rubber in a wide temperature range.