Oil resistant rubber pipes are mainly used to transport oil media. It is required that the greater the difference among the solubility parameters of the used rubber and the transported oil, the better, and the longer the service life. In practical production, nitrile rubber has excellent oil resistance and is an ideal raw material for producing oil resistant rubber tubes. Recycled nitrile rubber is processed from waste nitrile rubber products as the main raw material, retaining the basic properties of nitrile rubber, oil resistance, wear resistance, and aging resistance; Can nitrile rubber be mixed into oil resistant rubber tubes? How to design the formula of recycled rubber oil resistant hose?
1. Selection of rubber raw materials for producing oil resistant rubber tubes using nitrile rubber
The oil resistant rubber tube can be prepared using nitrile rubber alone, or using nitrile rubber and neoprene together, or using nitrile rubber/polymer blends to prepare oil resistant rubber tubes. Recycled nitrile rubber 2SLY320 is a raw material for high-value nitrile rubber, which can replace part of the original nitrile rubber to produce oil resistant rubber tubes, effectively reducing raw material costs. In actual production, the outer layer of oil resistant rubber tubes is mainly made of neoprene, which can be used in combination with nitrile rubber to prepare a more cost-effective outer layer of oil resistant rubber tubes.
2. Design of vulcanization system for oil resistant rubber tubes produced from nitrile rubber
When producing oil resistant rubber tubes using nitrile rubber/nitrile reclaimed rubber blends, it is recommended to use a low sulfur blend. When nitrile rubber, nitrile reclaimed rubber, and chloroprene rubber are used together, a vulcanization system with a large proportion of rubber is used; For example, if the ratio of neoprene rubber is larger than that of nitrile rubber, the vulcanization system of neoprene rubber is more suitable.
3. Design of reinforcing and filling system for oil resistant rubber tube produced by nitrile rubber
When using nitrile rubber/recycled nitrile rubber to produce oil resistant rubber pipes, carbon black reinforcement is often used. High abrasion furnace black is used alone with general furnace black, high abrasion furnace black/semi reinforced carbon black is used together, or general furnace black/semi reinforced carbon black is used together, and the dosage is controlled among 30-50 parts. It is recommended to use semi reinforced carbon black as the outer layer of the oil resistant rubber tube, and use an appropriate amount to reduce the amount of carbon black used. Nitrile rubber/recycled nitrile rubber oil resistant hose compound can be filled with inorganic fillers such as calcium carbonate and clay.
Without affecting other properties of the nitrile rubber/reclaimed rubber blend, properly increasing the amount of reinforcing agent and filler can improve the swelling resistance of the oil resistant rubber hose.
4. Design of softening system for oil resistant rubber tubes produced from nitrile rubber
When using nitrile reclaimed rubber to reduce the production cost of oil resistant rubber tubes, the rubber used in the rubber tubes needs to use softening plasticizer products that are not easily dissolved by the transport medium and do not accelerate rubber aging; On the premise of meeting the process performance requirements, the use of softeners and plasticizers should be minimized. Ester plasticizers are recommended for the preparation of oil resistant rubber tubes using nitrile rubber, nitrile rubber/nitrile rubber blends, and neoprene rubber; Coreless molding hose containing nitrile reclaimed rubber can be appropriately used with a solid softening plasticizer.
The reasonable use of nitrile rubber for oil resistant rubber pipes can not only ensure the oil resistance and aging resistance of the product, but also effectively reduce the cost of raw materials; The following editor will continue to share with you the key points of the production process for different layers of oil resistant rubber tubes containing nitrile reclaimed rubber.
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