The reclaimed butadiene acrylonitrile rubber can be used alone or combined with the original butadiene acrylonitrile rubber to produce oil resistant and wear-resistant rubber products, reducing the production cost. When producing rubber products with reclaimed butadiene acrylonitrile rubber as the main raw material, selecting appropriate softeners can give butadiene acrylonitrile rubber better processing performance and adhesion. In the actual production, the commonly used softeners for nitrile reclaimed rubber products include Gumaron resin, coal tar resin, liquid nitrile, etc; Petroleum based softeners such as paraffin, vaseline, spindle oil, etc. have poor compatibility with nitrile rubber and should not be used.
1. Adding skills of Gumarone resin in nitrile reclaimed rubber products
Gumaron resin has good compatibility with nitrile rubber compound, and is not easy to be extracted by solvent. It is one of the commonly used softeners in the production of nitrile reclaimed rubber products. In actual production, the low softening point coumarone resin (coumarone with softening point among 20-28 ℃) has good process performance, which can significantly improve the mixing and pressing process of nitrile reclaimed rubber; Gumarone resin with high softening point (Gumarone with softening point above 110 ℃) has poor softening effect, which will cause rubber aging when used, and is mostly used as an organic reinforcing agent.
Gumaron resin has a certain solubility in sulfur, which can reduce the sulfur injection of sulfur vulcanizate of nitrile reclaimed rubber to a certain extent, and reduce the scorch during rubber mixing; At the same time, Gumaron resin can also increase the dispersion of sulfur and improve the uniformity of vulcanization of NBR reclaimed rubber, which is beneficial to improve the strength, elongation and hardness of NBR reclaimed rubber vulcanizate. When Gumaron resin is used as softener of reclaimed butadiene acrylonitrile rubber products, the dosage is generally controlled at about 10 phr; Liquid coumarone resin is also commonly used as a tackifier for nitrile rubber.
2. Adding skills of coal tar resin in nitrile reclaimed rubber products
Coal tar resin is a by-product of coal coking. The fraction of coal tar in the high molecular weight range has good compatibility with nitrile rubber and nitrile reclaimed rubber. It is a commonly used softener and plasticizer in the production of nitrile reclaimed rubber 2ELYY1230 products. It should be noted that coal tar resin contains some substances such as asphalt, which will reduce the heat resistance, oxidation resistance, flexion cracking resistance and other properties of nitrile reclaimed rubber vulcanizate when used. Therefore, it is necessary to reasonably control the amount of coal tar resin.
In actual production, the softening and viscosity increasing effect of coal tar resin in nitrile reclaimed rubber is not as good as that of coumarone resin.
3. Adding skills of liquid nitrile in nitrile reclaimed rubber products
Liquid butadiene nitrile is a kind of rubber with butadiene and acrylonitrile as the main chain structure, containing or without other functional groups, and in the state of viscous liquid at room temperature, mainly used as reactive plasticizer and softener. Liquid nitrile has good compatibility with nitrile rubber and reclaimed nitrile rubber, is difficult to seep out of the rubber compound, and is not easy to volatilize at high temperature. It is an ideal softener in the production of reclaimed nitrile rubber products.
4. Adding skills of petroleum softener in nitrile reclaimed rubber products
The softening effect of petroleum based softeners in the reclaimed butadiene acrylonitrile rubber is not good, and it is generally required to be modified before use. For example, when the paraffin wax is treated to chlorinated paraffin wax and the dosage is controlled below 20 phr, the tensile strength of the nitrile reclaimed rubber is almost not affected, and the impact on the constant elongation and elongation at break of the nitrile reclaimed rubber vulcanizate is very small.
When producing oil resistant rubber plates, oil resistant shoe soles, oil resistant seals and other rubber products with reclaimed butadiene acrylonitrile rubber as the main raw material, rubber product manufacturers can also use vulcanizing ointment as the softener. Later, Xiaobian will continue to share with you the selection skills of commonly used vulcanizers, fillers, plasticizers and antioxidants for reclaimed butadiene acrylonitrile rubber products.
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