Nitrile rubber (NBR) is widely used in the production of various types of oil-resistant rubber products because of its excellent oil resistance, in recent years, the cost reduction requirements of oil-resistant rubber products are more urgent, many manufacturers in order to find lower cost raw materials and use nitrile recycled rubber. Compared with nitrile rubber, nitrile recycled rubber has the advantages of recyclability, lower cost and simple rubber mixing process.
First, the environmental protection of nitrile recycled rubber
Nitrile recycled rubber is made by waste nitrile rubber gloves through crushing, crushing, desulfurization, filtration, tableting and other processes, compared with nitrile rubber, it has higher resource utilization and environmental protection, which can reduce the demand for oil and reduce the generation of waste. Nitrile regeneration glue should choose odorless filter nitrile regeneration gum, and users with taste are unwilling to accept it
Second, the production process of oil-resistant rubber pipe
The production process of oil-resistant rubber pipe mainly includes the following steps:
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1. Ingredients: According to the required nitrile recycled rubber pipe performance requirements, according to the formula to prepare raw materials, including nitrile recycled rubber, filler, softener, vulcanizing agent, etc., if higher oil resistance is required, it can be used with some nitrile rubber.
2. Mixing: put the prepared raw materials into the mixer to mix, so that all kinds of large-volume powder, grease and other raw materials are fully dispersed and mixed (the mixing degree should not be too high), after mixing, add accelerator and vulcanizing agent to the mill and then triangular wrap the pieces to form a rubber sheet with uniform mixture.
3. Parting: The mixed rubber material is calendered through a calender to press it into a rubber sheet of the required thickness.
4. Winding: The calendered rubber sheet is wound on the steel wire skeleton or fiber skeleton to form the basic structure of the rubber pipe.
5. Vulcanization: Put the winding rubber tube into the vulcanization tank for vulcanization treatment, so that the rubber molecules are cross-linked and the physical and chemical properties of the rubber tube are improved.
6. Testing: Carry out various performance tests on the vulcanized rubber tube, such as hardness, tensile strength, oil resistance, etc., to ensure that the product quality meets the requirements.
7. Cutting and packing: Cut the qualified rubber tube to the required length, clean, pack, and finally sell it out of the factory.
Third, the formula of oil-resistant rubber pipe
The following is a common formulation of nitrile recycled rubber oil-resistant rubber tubing:
HY nitrile regenerated rubber 100 parts, N550 carbon black 8 parts, calcium powder 30 parts, dicapryl ester or dibutyl ester 4 parts, paraffin wax 3 parts, zinc oxide 2.5 parts, stearic acid 1.5 parts, CZ accelerator 0.4 parts, DM 0.5 parts, sulfur 1.8 parts, RD antioxidant 1 part, anti-scorch agent 0.5 parts, vulcanization temperature 140 °C, vulcanization time according to the thickness of the product to determine. In the actual production process, these formulations need to be adjusted according to different performance requirements and application scenarios, for example, the amount of fillers such as carbon black and calcium powder can be increased or decreased to adjust the hardness, strength and wear resistance of rubber tubes.
Nitrile recycled rubber production oil-resistant rubber pipe has high environmental protection and good performance, and is widely used in the production of various oil-resistant rubber products. Optimize product performance with process control and formula improvement, produce rubber products that meet performance requirements at a lower cost, reduce costs and increase profits for enterprises, and open up a larger rubber products market.
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