The sealing ring of pipe fitting joints is mainly used to ensure the tightness of pipeline connections, and is generally processed from natural rubber and synthetic rubber as raw materials to effectively prevent medium leakage. Nitrile reclaimed rubber is processed from waste nitrile rubber products such as nitrile gloves as raw materials, or an appropriate amount of sub-brand nitrile butadiene rubber is added, the product has good oil resistance and wear resistance, and can be used alone or combined with the original rubber to produce pipe fitting joint sealing rings, effectively reducing the cost of raw materials.
1. Example of low-cost vulcanization formula for the production of pipe fitting seals by nitrile reclaimed rubber
100 parts of nitrile reclaimed rubber, 5 parts of zinc oxide, 1.5 parts of stearic acid, 100 parts of carbon black, 23 parts of DOP, 2 parts of solid coumarone, 1.5 parts of antioxidant D, 1 part of paraffin, 2 parts of promoting TMTD, 3 parts of accelerator DM, 0.4 parts of accelerator D, 0.6 parts of sulfur; Total: 240 copies.
2. Nitrile reclaimed rubber production pipe fitting sealing ring vulcanization formula optimization skills
When using nitrile reclaimed rubber to produce low-cost pipe fitting seals, it is the key to choose the appropriate index of nitrile reclaimed rubber, especially the acrylonitrile content, hardness, tensile strength, elongation at break, etc. of nitrile reclaimed rubber, which is closely related to the oil resistance, hardness, wear resistance and so on of the finished sealing ring, and an appropriate amount of nitrile rubber can be added if necessary. Adjusting the variety and dosage of compounding agent in the vulcanization formula of the sealing ring of nitrile reclaimed rubber fittings can further optimize the quality of the finished product, especially the performance indicators such as hardness and compression deformation resistance.
(1) Adjust the hardness of the sealing ring of the nitrile reclaimed rubber fittings
When nitrile raw rubber is used in the sealing ring of nitrile reclaimed rubber pipe fitting joints, the proportion of raw rubber increases and the hardness of the sealing ring increases. When sulfur vulcanization is used in nitrile reclaimed rubber, increasing the amount of sulfur can increase the hardness of the sealing ring of pipe fittings. The use of reinforcing carbon black, such as high wear-resistant carbon black, in the reinforcing filling system can increase the hardness of the sealing ring of nitrile reclaimed rubber; When using calcium carbonate, clay, etc., excessive dosage will reduce the hardness of the rubber compound. The use of plasticizers such as dibutyl phthalate (DBP) or mineral oil can reduce hardness and improve the flexibility of the material in the vulcanized formulation softening system of nitrile reclaimed rubber.
(2) Adjust the compression and permanent deformation of the sealing ring of the nitrile reclaimed rubber fittings
In actual production, high-quality nitrile reclaimed rubber itself has low compression set characteristics. When nitrile reclaimed rubber and original rubber are used together to produce pipe joint sealing rings, an appropriate increase in the proportion of original rubber can improve the deformation resistance. Adjust the vulcanization system of nitrile reclaimed rubber, including the type and amount of vulcanizing agent and accelerator, as well as the vulcanization temperature and time, to obtain the best crosslinking density and network structure. Increasing the amount of carbon black and silica in the reinforcing filling system can improve the strength and wear resistance of the sealing ring of the pipe fitting, thereby reducing the compression set.When using nitrile reclaimed rubber as the main raw material to produce pipe fitting joint sealing rings, rubber product manufacturers need to consider the use environment, contact medium, and pressure of the sealing ring; In the future, Xiaobian will continue to share with you the skills of optimizing the vulcanization formula of the key joint sealing ring of nitrile reclaimed rubber to reduce more raw material costs and production energy consumption.
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