Seal rubber used for valves and preparation method thereof

Abstract

The invention relates to seal rubber used for valves, which comprises the following raw materials by weight: 800 to 1200 parts of butadiene-acrylonitrile rubber, 30 to 70 parts of zinc oxide, 5 to 30 parts of stearic acid, 2 to 25 parts of sulfur, 22 to 80 parts of antiager, 400 to 800 parts of carbon black, 100 to 150 parts of white carbon black, 20 to 400 parts of softener, 5 to 40 parts of vulcanizing agent, and 15 to 70 parts of accelerator, optimally, the antiager comprises the following raw materials by weight: 10 to 30 parts of antiager BLE, 10 to 30 parts of antiager 4020 and 2 to 20 parts of antiager DNP; and the accelerator comprises the following raw materials by weight: 5 to 25 parts of accelerator TMTD and 10 to 45 parts of accelerator CZ. Particularly, the seal rubber can be made by the following raw materials by weight: 1000 parts of butadiene-acrylonitrile rubber NBR2845, 50 parts of zinc oxide ZnO, 10 parts of stearic acid SA, 5 parts of sulfur, 20 parts of antiager BLE, 20 parts of antiager4020, 5 parts of antiager DNP, 600 parts of carbon black N200, 133 parts of white carbon black, 200 parts of softener DOP, 20 parts of vulcanizing agent DTDM, 10 parts of accelerator TMTD and 30 parts of accelerator CZ.

Description

technical field [0001] The invention belongs to the field of valve sealing, and in particular relates to a valve sealing rubber and a preparation method thereof. Background technique [0002] Sealed valves consist of rubber seals attached to metal valve bodies. Sealed valves used in underground drinking water systems, in addition to the performance requirements, also require that the rubber parts in contact with water must be non-toxic, in line with the international standard NSF61. For the rubber sealing strip of the valve, in addition to the static tensile strength, elongation at break, hardness, and elasticity to meet the sealing requirements, it also needs to meet the dynamic frequent switching state, wear and tear resistance. However, domestic rubber products generally only require performance, and there are no toxicological requirements and testing methods. The current formula used can meet the performance and toxicological requirements, but this formula is prone to b...

AI Technical Summary

Problems solved by technology

However, domestic rubber products generally only require performance, and there are no toxicological requirements and testing methods. The current formula used can meet the performance and toxicological requirements, but this formula is prone to blooming, that is, some of the products are exposed during storage. Compounding agents that exceed their solubility in rubber will crystallize and precipitate, causing a layer of powdery substance on the surface of the rubber, which not only affects the appearance quality, but also reduces the performance