2results about How to "Guaranteed crosslink density" 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.

This application relates to a special material for thermally conductive and pressure-resistant polyolefin pipes and its preparation method. The special material comprises a polyethylene resin blend matrix, pretreated filler, maleic anhydride-grafted polyethylene, polyvinyl chloride / polyethyl methacrylate (PVC / PEMA) polymer, carbon fiber, and stabilizer. The preparation method includes adding the polyethylene resin blend matrix, PVC / PEMA polymer, maleic anhydride-grafted polyethylene, pretreated filler, carbon fiber, antioxidant, and zinc stearate into a high-speed mixer and mixing them. Then, the mixture is blended with vinyltrimethoxysilane and dicumyl peroxide using a twin-screw extruder at 195°C and 280 rpm, and granulated to obtain the special material for thermally conductive and pressure-resistant polyolefin pipes. The resulting special material has both high thermal conductivity and pressure resistance, making it suitable for manufacturing polyolefin pipes. It solves the problems of poor thermal conductivity and insufficient pressure resistance of polyolefin pipes and can be applied to geothermal, underfloor heating, and chemical fluid transportation systems.