Nitrile recycled rubber is mostly processed from nitrile waste rubber (such as machine head rubber) and waste nitrile rubber products (such as nitrile rubber gloves) as raw materials, which is mainly used to replace high-priced nitrile rubber to produce various oil-resistant rubber products, effectively reducing raw material costs. Why is nitrile recycled rubber suitable for the production of oil-resistant rubber products? What rubber products can be produced using nitrile recycled rubber? What issues should be paid attention to when using it?
1. Why is the main use of nitrile recycled rubber in the production of oil-resistant rubber products?
(1) Nitrile recycled rubber retains the molecular chain structure and performance characteristics of nitrile rubber, contains extremely high polarity cyano, and has weak interaction with non-polar mineral oils and fuel oils, making it difficult for oil molecules to penetrate E5LYY1111 The polar groups increase the intermolecular force, make the rubber network tight, and reduce the dissolution and diffusion ability of oils. Therefore, the oil resistance of nitrile recycled rubber is better than that of non-polar rubber and recycled rubber such as natural rubber, neoprene and styrene-butadiene rubber, and is suitable for the production of oil-resistant rubber products.
(2) Nitrile recycled rubber contains acrylonitrile, which reduces the unsaturation of the main chain; The cyano group in the acrylonitrile unit has strong polarity and electron absorption ability, which can stabilize the hydrogen atoms at the allyl position in the butadiene chain segment and reduce the oxidative degradation rate of the molecular chain under thermal action. The intermolecular force was enhanced, the movement of the chain segments was blocked, and the thermal stability of nitrile recycled rubber was further improved.
(3) The cyano group in the acrylonitrile unit of nitrile recycled rubber has strong polarity, which increases the attraction among the molecular chains of nitrile recycled rubber and makes the molecular arrangement tighter, which improves the cohesion strength and tear and wear resistance of the material. Nitrile recycled rubber has excellent oil resistance and good heat resistance and wear resistance, and can be used alone or in combination with nitrile rubber and neoprene to produce oil-resistant rubber products, and the finished product can maintain good performance for a long time under high temperature or frequent friction working conditions.
2. What oil-resistant rubber products can be produced by nitrile recycled rubber?
Nitrile recycled rubber has excellent oil resistance and can replace nitrile rubber in whole or in part to produce various oil-resistant rubber products, such as oil seals, oil-resistant hoses, oil-resistant rubber plates, oil-resistant rubber boots, fuel tank gaskets, rubber diaphragms, leather bowls, chemical container linings, oil-resistant gaskets, printing rubber rollers, oil-resistant shock absorbers, etc., effectively reducing raw material costs, saving labor and electricity; If necessary, it can also be used in conjunction with PVC to further improve the oil resistance and ozone aging resistance of nitrile recycled adhesive.
3. Several issues that need to be paid attention to in the production of oil-resistant rubber products with nitrile recycled rubber
(1) Pay attention to the acrylonitrile content of nitrile recycled rubber: the oil resistance of nitrile recycled rubber is directly related to the content of acrylonitrile, and the higher the acrylonitrile content, the better the oil resistance of the recycled glue; When using nitrile recycled rubber to produce rubber products with high oil resistance requirements, it is recommended to choose nitrile recycled rubber with an acrylonitrile content greater than 36%.
(2) Reasonable control of the mixing ratio of nitrile recycled rubber: When using nitrile recycled rubber to replace the original rubber to produce oil-resistant rubber products, it is necessary to comprehensively consider the mechanical strength and oil resistance requirements of the product, and reasonably control the mixing ratio of recycled rubber.
(3) Appropriately adjust the formula of nitrile recycled rubber products: when using nitrile recycled rubber as the main raw material to produce rubber products, high wear-resistant carbon black is mostly used to reinforce it to meet the physical and mechanical properties of different varieties of oil-resistant rubber products. Using a low-sulfur high-promotion or peroxide vulcanization system, the vulcanized rubber has better oil and heat resistance, and the vulcanization temperature is controlled among 150-160°C.
When using nitrile recycled rubber to produce oil-resistant rubber products, rubber product manufacturers also need to strictly control the production process, especially the compounding and vulcanization process, such as paying attention to the feeding order during mixing, usually recycled rubber → small materials→ reinforcing agents→ softeners→ sulfur, and strictly controlling the roll temperature (front roller 45-50 °C, rear roll 40-45 °C) to prevent scorching. In the later stage, the editor will share with you the vulcanization formula and design points of different varieties of oil-resistant rubber products produced by nitrile recycled rubber.
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