Nitrile reclaimed rubber processed from waste nitrile rubber and waste nitrile rubber products has excellent oil resistance and abrasion resistance. It can directly replace all or part of nitrile rubber to produce rubber products, effectively reducing raw material costs. In actual production, there is a certain gap between the plasticity and fluidity of nitrile reclaimed rubber and the original nitrile rubber. The type and amount of compounding agents in the softening and plasticizing system of rubber products containing nitrile reclaimed rubber need to be adjusted appropriately.
1. The role of softening and plasticizing system in nitrile rubber
Most nitrile rubbers on the market have high initial viscosity and poor processing performance; the softening and plasticizing system compounding agent in the rubber formula can reduce the force between the molecular chains of nitrile rubber, improve the plasticity and fluidity of the rubber, and improve the processing technology of the rubber Performance, improve the physical and mechanical properties and production efficiency of nitrile rubber products. In actual production, the commonly used plasticizers 2LLYY119 for nitrile rubber products include dibutyl phthalate, dioctyl phthalate, toluene phosphate, coumarone, dioctyl sebacate, and adipic acid. Dioctyl ester and so on.
2. Reference dosage of softening plasticizer for nitrile rubber products
In the production process of nitrile rubber products, the amount of plasticizer is generally controlled at about 10-30 parts, the amount of coumarone resin is controlled at about 10 parts, and the amount of black and white ointment in the extruded product is roughly between 5-20 parts. The specific dosage is adjusted appropriately according to the specific needs of rubber products. It should be noted that the use of softening plasticizers will reduce the mechanical properties of the nitrile rubber, and the use of black and white ointment will also cause the heat resistance and aging resistance of the rubber to decrease, so the dosage needs to be controlled reasonably.
3. Plasticizer dosage of NBR products containing nitrile reclaimed rubber
In actual production, the amount of softening plasticizer in the formulation of nitrile rubber products containing nitrile reclaimed rubber is generally less than that of pure nitrile raw rubber. When designing the formula of rubber products containing nitrile reclaimed rubber, the ratio of nitrile reclaimed rubber can be determined according to the rubber content, and the other parts are used as fillers and softening plasticizers; usually rubber products containing nitrile reclaimed rubber The amount of plasticizer in the formula should be appropriately reduced.
Compared with nitrile virgin rubber, nitrile reclaimed rubber has better plasticity and fluidity. Excessive use of softening plasticizer will cause problems such as the decline of physical and mechanical properties of nitrile rubber. Therefore, the amount of softening plasticizer in the formula should be Reduce appropriately.
In actual production, the formula of rubber products containing nitrile reclaimed rubber not only needs to adjust the softening and plasticizing system, but also the vulcanization system, anti-aging system, and filling system. Generally, the formulation of nitrile reclaimed rubber contains active agents, antioxidants, and fillers. , The amount of softening plasticizer should be appropriately reduced, using nitrile reclaimed rubber to reduce the cost of rubber products while further optimizing product performance, the editor will continue to discuss with you later.
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