The use of a certain proportion of nitrile reclaimed rubber in the oil-resistant hose formulation with nitrile rubber as the main raw material can reduce the production cost and ensure the long-term use of the hose in the oil medium. When the nitrile reclaimed rubber is used to produce the oil resistant hose, the hose is improved. The surface finish is important for improving the quality of the oil-resistant hose. So how to improve the surface smoothness of the nitrile oil-resistant hose? How to implement it?
1. Carefully choose rubber packing
Rubber filler is the most used component in rubber products except rubber; when rubber packing is selected for oil-resistant hose containing nitrile reclaimed rubber, the first is to avoid the use of large particles and rubber fillers containing impurities, which can match high structural degree. Carbon black with low specific surface area, and through continuous experimentation, it is found that the amount of carbon black which is most favorable for the brightness of the oil-resistant hose surface is filled with high calcium carbonate and talc powder. The effect of talc powder on improving the surface brightness of the oil-resistant hose of nitrile reclaimed rubber is better than that of carbonic acid. Calcium is better.
2. Using processing aids
In the production of rubber products, the processing aid generally refers to a compounding agent which has good compatibility with rubber and can improve the dispersibility and fluidity of the rubber compound. In the oil-resistant hose formulation containing nitrile reclaimed rubber, rubber manufacturers can add appropriate amount of fatty acid or potassium soap to improve the surface finish of the extruded hose; or use an appropriate amount of liquid nitrile rubber in the nitrile reclaimed rubber oil resistant hose formulation. It can improve the oil resistance of the nitrile oil resistant hose, and can also be used as a non-extractable plasticizer to improve the smoothness of the oil resistant hose surface. The vulcanized vegetable oil can improve the flowability and plasticity of the nitrile reclaimed rubber compound. Nitrile oil resistant hose surface finish.
3. Mixing rubber parking
After the general mixing, the rubber mixture will be used for a period of time to improve the quality of the finished rubber products. When the nitrile reclaimed rubber produces the oil-resistant rubber hose, the rubber compound will produce a certain amount of bonding rubber during the parking process. If the parking time is too long, the combined rubber content in the rubber compound will increase, and finally the mechanical properties and surface finish of the oil resistant hose will be directly reduced. Therefore, the parking time of the nitrile reclaimed rubber after mixing is not too long.
4. Strictly control the extrusion process
The hose is a typical extruded rubber product. When using the nitrile reclaimed rubber to produce the extruded oil resistant hose, the high kneading screw extruder, the gear pump extruder or the appropriate increase of the length of the extruder barrel can improve the nitrile resistance. The surface finish of the hose; the die is heated in advance during the extrusion process to reduce the viscosity of the rubber, which can avoid the tearing problem of the oil-resistant extruded hose; timely check whether the extruder is working normally, avoiding the extruder being in an under-sulfur state and ensuring feeding The metering speed is matched with the screw extrusion capacity to provide sufficient rubber; the extrusion rate should not be too large, and the extruder extrusion pressure should be kept below the critical shear stress.
5. The surface finish of the nitrile oil resistant hose can also be improved by using an appropriate amount of neoprene in the nitrile reclaimed rubber hose formulation.
When using the nitrile reclaimed rubber to produce the extruded oil-resistant hose, in order to ensure the surface finish of the hose, it is necessary to use a high-fineness, impurity-free nitrile reclaimed rubber, strictly control the production process, avoid mixing impurities, and improve the surface smoothness of the nitrile oil-resistant hose.