The oil-resistant rubber diaphragm, such as the oil valve diaphragm, which is processed by using high acrylonitrile content of nitrile rubber and polyvinyl chloride as main raw materials, is not only difficult to process and costly in the processing process, but also has poor flexibility and short life when used. This is the result of the "swelling" leading to the deterioration of the mechanical properties of the oil-resistant diaphragm; the nitrile reclaimed rubber has made a "sweet" in solving the problem of "swelling" of the smooth tire, which means that it can also solve the oil-resistant diaphragm. What are the problems of high production costs, difficult processes, and worrying quality?
The so-called "swelling" refers to the phenomenon that the polymer polymer expands in the solvent in the encyclopedia. Taking the oil valve diaphragm of the gas station as an example, the oil valve diaphragm produced by using high acrylonitrile nitrile rubber and polyvinyl chloride has poor oil resistance. When it is in contact with the oil medium for a long time, the volume will become larger and the mechanical properties will be degraded, thereby losing the use effect.
Nitrile rubber has excellent oil resistance and heat resistance, and is an ideal material for producing oil-resistant separators. However, NBR itself has relatively poor ozone resistance and wear resistance; on the contrary, polyvinyl chloride has excellent chemical stability and flame retardancy. Ozone-resistant, electrically insulating, both of which are highly polar polymers with good compatibility and are often used to produce oil-resistant separators. However, in actual production, polyvinyl chloride has poor elasticity, impact resistance and heat resistance. Although the addition of polyvinyl chloride in nitrile rubber can reduce the cost and improve the ozone resistance of the rubber compound, the elasticity of the oil resistant separator will follow The increase in the amount of vinyl chloride is reduced, the Mooney viscosity is increased, and the oil resistance is deteriorated, eventually resulting in a shortened service life of the oil resistant membrane.
The nitrile reclaimed rubber is a recycled rubber made from waste nitrile rubber or nitrile water. The performance characteristics are basically the same as that of nitrile rubber. The oil resistance is large and the hand feel is good. It is used together with nitrile rubber to produce oil resistant separator. It can reduce the cost of raw materials, and can also improve the oil resistance, wear resistance, softness and aging resistance of the nitrile oil valve diaphragm, thereby prolonging the service life of the oil-resistant membrane and improving the cost performance of the product.
However, as a product of recycling and reprocessing of waste materials, nitrile reclaimed rubber still has certain shortcomings, and there is a certain gap between mechanical properties and nitrile rubber. Therefore, rubber products manufacturers should use D-butadiene reclaimed rubber to produce oil-resistant separators. Nitrile reclaimed rubber and nitrile rubber are used together to reduce the production cost while ensuring the service life of the nitrile rubber diaphragm. Studies have shown that the ratio of the ratio of nitrile reclaimed rubber to nitrile rubber can be controlled between 7:3 to obtain a cost-effective oil-resistant separator.
Formulation: nitrile reclaimed rubber, 70 parts; nitrile rubber, 30 parts; sulfur, 2 parts; accelerator, 3 parts; antioxidant, 1 part; zinc oxide, 4 parts; stearic acid, 1 part; 35 parts; diisodecyl phthalate, 8 parts; total: 154 parts. The addition of nitrile reclaimed rubber will reduce the mechanical strength of the oil-resistant separator. There are some differences in the mechanical indexes of the nitrile reclaimed rubber produced by different reclaimed rubber factories. Therefore, the ratio of the nitrile reclaimed rubber in the oil-resistant separator can be mixed. According to the actual situation, the amount of various compounding agents is appropriately increased or decreased.