2results about How to "Permanent deformation" patented technology

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.