Some rubber sheaths need to be in contact with mineral oil, oil mist, etc. during the working process, and have certain requirements for the oil resistance of the rubber used. Nitrile rubber or neoprene rubber is often used to produce such rubber sheaths. Recently, the domestic market price of nitrile rubber has risen sharply, and the supply price of Lanhua nitrile rubber has increased by 500-600 yuan/ton, and some nitrile rubber has increased by as much as 1,000 yuan, which undoubtedly increases the cost pressure of nitrile rubber products manufacturers. For manufacturers of nitrile sheaths, proper use of reclaimed rubber can effectively reduce raw material costs.
1. Choose reclaimed rubber carefully
Nitrile reclaimed rubber retains the excellent oil resistance of nitrile virgin rubber. It can significantly reduce the raw material cost by replacing all or part of nitrile virgin rubber to produce various nitrile rubber products. In actual production, the nitrile rubber sheath has higher requirements for oil resistance, mechanical strength, abrasion resistance, weather resistance, aging resistance, etc. The high content of nitrile reclaimed rubber 2LLYY1028 can meet the above requirements. The appearance of the finished rubber sheath requires a smooth, flat surface, no bubbles, and no impurities. It is necessary to choose high-fineness, no impurities, reclaimed nitrile rubber.
Therefore, when using nitrile reclaimed rubber to replace part of nitrile rubber to produce cost-effective rubber sheaths, it is recommended to choose nitrile reclaimed rubber with a rubber content of more than 70%, a fineness of 60-80 mesh, and no impurities. At the same time, it can better guarantee the physical properties and service life of the rubber sheath.
2. Reference formula for nitrile rubber sheath
Nitrile rubber 100 parts, zinc oxide 5 parts, stearic acid 2 parts, antioxidant MB 2 parts, antioxidant RD 1 part, paraffin wax 1 part, carbon black N550 20 parts, carbon black N774 30 parts, dioctyl sebacate 15 parts of esters, 15 parts of calcium carbonate, 3.6 parts of accelerators, 0.4 parts of sulfur; 195 parts in total.
When using nitrile reclaimed rubber instead of nitrile virgin rubber to produce oil-resistant jackets, rubber product manufacturers can use the above formula as a reference, combining the specific performance requirements of the rubber jacket, the content of nitrile reclaimed rubber and other factors to determine the proportion of reclaimed rubber added. , Adjust the formula appropriately, especially the vulcanization system and reinforcement system. For example, when using NBR reclaimed rubber for the nitrile rubber sheath with higher mechanical strength, the amount of semi-reinforcing carbon black can be appropriately increased, or an appropriate amount of high wear-resistant furnace black such as N330 can be directly added.
3. Properly adjust the production process
When using nitrile reclaimed rubber or nitrile rubber/reclaimed rubber combined with rubber to produce oil-resistant rubber sheath, the rubber should be fully re-melted before molding, and the mold should be preheated in advance and then loaded, and the vulcanization process should be pressurized 2-3 times Relieve pressure to exhaust, stabilize and vulcanize. In the production process of nitrile sheath, the production process parameters are reasonably set according to the processing performance of the rubber material, and the time between the mixing, vulcanization and cooling processes is coordinated to maximize the production efficiency.
There are still many issues that need attention when using nitrile reclaimed rubber instead of nitrile virgin rubber to produce oil-resistant jackets. I will have the opportunity to discuss with you later.
Exclusive original article [commercial authorization] reprint, excerpt and excerpt in any form are prohibited without written authorization. Focus on Hongyun rubber: learn the process formula and raw material technology of producing rubber products from recycled rubber to help you reduce costs and increase profits