Recycled rubber is an important recycled rubber material, which can effectively reduce resource consumption and environmental pollution. In rubber products, the production of NBR oil-resistant black solid round strip with part of recycled rubber can reduce product cost under the premise of ensuring quality, and has good oil resistance and sealing performance. The production of NBR oil-resistant sealing strip black solid round strip vulcanization formula and rubber refining process mixed with nitrile reclaimed rubber is different from the use of nitrile rubber alone, and the specific skills are as follows:
1、The quality and performance of rubber products are directly affected by raw materials, considering the oil resistance and strong requirements of NBR oil-resistant black solid round strips, it is necessary to adjust the amount of recycled rubber and the type and amount of additives to ensure the performance of the final product. Of course, stable quality nitrile reclaimed glue is a prerequisite, even if the best quality nitrile reclaimed glue can not be used if it is unstable.
2、Nitrile reclaimed rubber is not resistant to high temperature, and it is not advisable to mix for a long time after adding rubber additives to avoid the aging and plasticizer consumption of nitrile mixture rubber by excessive mixing. It is recommended to add antioxidants and anti-coke agents to the mixture, rather than adding them together with the curing agent accelerator in the mill.
3、Nitrile rubber introduces a strong polar cyanide group, which has a large intermolecular force, and belongs to polar rubber with poor molecular chain compliance, and is generally not blended with other varieties of rubber. Some customers reported that some natural rubber was added to the nitrile plasticizer, and the rubber was mixed to make two skins, and the compatibility was relatively poor.
Mixed with Hongyun nitrile reclaimed rubber to produce NBR oil-resistant sealing strip black solid round strip reference vulcanization formula: HY nitrile reclaimed rubber 40kg, 3305 nitrile rubber 3kg, 244 longevity neoprene 2kg, N550 carbon black 4kg, light calcium carbonate 15kg, Dioctyl 5.5kg, paraffin 0.42kg, 4000 polyethylene glycol 1.3kg, zinc oxide 1.5kg, stearic acid 0.7kg, RD antioxidants 0.3kg, CTP anti-scorch agent 1kg, CZ accelerator 0.22kg, TMTD accelerator 0.1kg, DM accelerator 0.2kg, vulcanization 0.55kg; the temperature of the extruder head should not be too high, the vulcanization temperature is 150 °C, and the vulcanization time is adjusted according to the thickness, generally mm/20-30 seconds.
The mixing process of nitrile regenerated rubber: first break the nitrile regenerated rubber in the open mill, and then put it into the mixer and 3305 nitrile rubber for blending and mixing for 5-7 minutes after basic molding, and the mixer adds anti-scorching agent and anti-aging agent. Do not repeatedly put down the pieces in the mill, the roll temperature above 55 °C can easily cause scorching, forming powdery residue.
The use of nitrile reclaimed rubber can not only reduce resource consumption and environmental pollution, but also improve utilization and reduce costs. The actual use of nitrile reclaimed rubber to produce NBR oil-resistant sealing strips and black solid round strips also requires attention to the skills of raw material selection, formula design, and rubber refining process. First of all, we must select the appropriate raw materials and formulas, pay attention to the order of compounding rubber and the uniformity of mixing; Secondly, the temperature and pressure in the extrusion molding process should not be too high, and the sulfurization experiment should be done to determine the best vulcanization point.
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