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Oil hose is mainly used to transport petroleum crude oil or petroleum products; Nitrile rubber has good oil resistance and is not easy to swell when used in oil medium for a long time. Therefore, most oil transmission rubber pipes use nitrile rubber as the main raw material, especially the inner rubber of oil transmission rubber pipes. In actual production, when nitrile rubber is used to prepare the inner layer of oil transmission rubber pipe, the rubber pipe manufacturer can also use recycled rubber appropriately in the formula to effectively reduce the cost of raw materials.

1. Preparation of inner rubber of oil transmission hose with pure nitrile rubber

(1) Nitrile butadiene rubber 100g, sulfur 1.5g, accelerator DM 1.6g, accelerator TT 0.4g, antioxidant A 1.5g, antioxidant D 1g, zinc oxide 5g, two portions of stearic acid, universal carbon black 105g, dibutyl phthalate 12g, and coumarone 7g; Total: 237g.

(2) Nitrile butadiene rubber 100g, sulfur 2g, accelerator DM 1.6g, accelerator D 0.2g, antioxidant D 1g, paraffin wax 0.5g, zinc oxide 5g, stearic acid 2g, semi reinforced carbon black 70g, active calcium carbonate 45g, clay 30g, dibutyl phthalate 25g, pine tar 10g; Total: 292.3g.

2. Inner rubber formula of oil transmission rubber pipe containing recycled rubber

70g nitrile rubber, 30g neoprene, 50g recycled rubber, 0.5g sulfur, 1.8g accelerator DM, 0.3g accelerator CZ, 5g zinc oxide, 2g magnesium oxide, 1.5g stearic acid, 10g coumarone, 2.5g antioxidant, 6g asphalt, 5g operating heavy oil, 8g dibutyl phthalate, 30g high wear-resistant carbon black, 10g universal carbon black, 33.4g precipitated calcium carbonate, and 1g clay 25g coke inhibitor; Total: 292g.

3. Precautions for using reclaimed rubber in oil delivery hose

The rubber for the inner layer of oil transmission rubber pipe shall have good elasticity and air tightness to ensure no leakage of oil substances during transportation, and have certain strength, elongation and aging resistance. When using the reclaimed rubber HYL15Y6Y2YWFM in the inner rubber of nitrile oil transmission hose to reduce the cost, the fine particle nitrile reclaimed rubber with high rubber content and high oil resistance should be selected to ensure the mechanical strength, oil resistance and permeability resistance of the inner rubber.

Sulfur vulcanization is used in the inner rubber formulation of oil transmission rubber pipe containing nitrile reclaimed rubber, and the mechanical strength of vulcanizate is higher. The tensile strength and constant elongation stress of the rubber compound in the inner layer of the oil delivery rubber hose can be further improved by using high wear-resistant carbon black reinforcement, and the elasticity and elongation at break of the rubber compound can be improved by using universal carbon black or semi reinforced carbon black; Filling inorganic fillers can further reduce the cost of raw materials. Dibutyl phthalate is a common plasticizer for oil resistant nitrile rubber products, and the oil resistance of vulcanizate is better.

When using nitrile reclaimed rubber to reduce the cost of raw materials for oil transmission rubber pipes, rubber product manufacturers can choose to use nitrile reclaimed rubber and nitrile rubber together, or use nitrile reclaimed rubber/nitrile rubber/neoprene rubber together, and can also use nitrile reclaimed rubber with high rubber content alone to directly replace nitrile raw rubber such as nitrile - 26. Later, I will continue to discuss the application of nitrile reclaimed rubber in oil transmission rubber pipes with you.