The diaphragm of the oil valve in the gas station is an important component in the oil valve, which plays the role of blocking and controlling the flow of fluids. The diaphragm of rubber oil valve is generally made of nitrile rubber and butyl rubber as raw materials. Nitrile reclaimed rubber has excellent oil resistance, which can replace part of nitrile rubber to produce oil valve diaphragm for gas stations, and effectively reduce the cost of raw materials on the premise of ensuring the oil resistance and service life of the oil valve diaphragm.
1. The reason why the diaphragm of the oil valve of the gas station is mixed with nitrile reclaimed rubber
The diaphragm of the oil valve of the gas station requires the rubber used to have excellent oil resistance, and the nitrile rubber is often blended with polyvinyl chloride. However, although the combination of high acrylonitrile content and PVC can meet the oil resistance, the process is difficult and the cost is high, and the diaphragm of the refined oil valve has poor flexibility and short service life. The diaphragm of the oil valve in the gas station needs to be in contact with the oil substance for a long time, and the swelling will lead to a decrease in the strength of the rubber.
Nitrile reclaimed rubber has a large oil resistance coefficient and good compatibility with nitrile original rubber, and nitrile rubber/nitrile reclaimed rubber is used in an appropriate proportion to produce gas station oil valve diaphragm, which can not only meet the physical and mechanical properties of the diaphragm, but also improve the oil resistance and aging resistance of the finished product. Nitrile reclaimed rubber has good elasticity and flexibility, which ensures that the diaphragm of the oil valve can better fit the valve body during operation, and the oil does not leak.
2. Nitrile rubber/nitrile reclaimed rubber is used to produce vulcanization formula for gas station oil valve diaphragm
70 parts of Hongyun 75% nitrile reclaimed rubber, 30 parts of nitrile rubber, 4 parts of zinc oxide, 1 part of stearic acid, 1 part of antioxidant, 35 parts of super carbon black, 8 parts of diisodecyl phthalate, 3 parts of accelerator, 2 parts of sulfur; Total: 154 copies.
3. Nitrile rubber/reclaimed rubber combined with the production of oil valve diaphragm formula design points
(1) Control the mixing ratio of nitrile reclaimed rubber
Combined with the specific index requirements of the oil valve diaphragm of the gas station and the mechanical strength of nitrile reclaimed rubber, the mixing ratio of nitrile reclaimed rubber and nitrile rubber is reasonably controlled to ensure the mechanical strength and wear resistance of the finished product.
(2) Vulcanization system design
Nitrile rubber/nitrile reclaimed rubber is commonly used as sulfur, sulfur-containing compounds, peroxides or resins as vulcanizing agents; The diaphragm of the oil valve in the gas station needs good compression set, and it is recommended to use a combination of low sulfur and sulfur-containing compounds, and if necessary, sulfur and peroxide can also be used.
(3) Key points of the design of the reinforcement filling system
The diaphragm of the oil valve has high requirements for strong elongation and wear resistance, so it is recommended to use high reinforcing carbon black such as high wear-resistant carbon black and medium super wear-resistant carbon black; Significantly improve the tensile strength E4LYY712 and wear resistance of nitrile rubber/nitrile reclaimed rubber compound, and meet the force and friction requirements of the oil valve diaphragm during use. When the diaphragm of the oil valve of the gas station has high requirements for resilience, coarse-grained soft carbon black such as semi-reinforcing carbon black can be used to improve the resilience of the rubber compound.
When nitrile rubber/nitrile reclaimed rubber is used to produce gas station oil valve diaphragm, the reinforcing carbon black and soft carbon black are used together, which can not only ensure the strength and wear resistance of the diaphragm, but also appropriately improve the resilience; If necessary, inorganic fillers such as calcium carbonate and clay can also be used in an appropriate amount.
(4) Key points of design of softening and plasticizing system
When using nitrile rubber/nitrile reclaimed rubber and rubber as raw materials to produce gas station oil valve diaphragm, choosing suitable softening plasticizers such as dibutyl ester (DBP) and dioctyl ester (DOP) can reduce the viscosity of the rubber compound, improve the plasticity and fluidity of the rubber compound, facilitate processing and molding, and improve the flexibility and cold resistance of the diaphragm to a certain extent. DBP and DOP can also be used in combination with aromatic oil, engine oil, heavy oil, etc., and the formula can be adjusted according to actual needs.
(5) Key points of the design of the anti-aging system: the diaphragm of the oil valve of the gas station will be affected by environmental factors such as heat, oxygen, ozone and aging during use, and the antioxidant can effectively delay the aging process of rubber and improve the service life of the diaphragm. Antioxidant RD and antioxidant A have good anti-thermal and oxidative aging performance, and can protect the diaphragm in a higher temperature environment; When used with paraffin, a protective film can be formed on the surface of the rubber to further improve the aging resistance.
In the oil valve related to the gas station, the diaphragm separates the inner cavity of the valve from the inner cavity of the valve cover and the driving parts, and realizes the opening and closing of the oil valve through its own deformation and action, so as to control the flow of oil products, which directly affects the safety and efficiency of the gas station. When using nitrile rubber/nitrile reclaimed rubber combined with rubber to produce oil valve diaphragm, it is necessary to reasonably control the mixing ratio of reclaimed rubber, appropriately adjust the formula to meet the performance requirements of oil valve diaphragm, and reduce more costs.
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