The degree of rubber vulcanization directly determines the quality and yield of rubber products. When nitrile rubber is vulcanized, rubber product manufacturers also need to ensure that the mold is not contaminated and improve the high temperature tearing performance of the rubber. In this regard, what measures should the manufacturers of nitrile rubber products take? What problems should be paid attention to when nitrile is vulcanized?
4. Mold contamination
When nitrile rubber is used to produce model products, mold contamination directly leads to unqualified vulcanized rubber, and problems such as difficulty in demolding during vulcanization. The basic idea to improve mold contamination during nitrile vulcanization is to reduce the amount of pollutants and seal them up. From the formulation point of view, reducing the amount of zinc oxide and stearic acid and avoiding the use of fatty acid processing aids can improve mold contamination; or use appropriate amounts of calcium carbonate and white carbon black for improvement, use hard carbon black, or adjust the vulcanization system To increase the vulcanization speed.
From the perspective of process operation, strengthening the role of compounding agents and improving operating conditions can also reduce mold contamination.
5. High temperature tearing
In actual production, increasing the crosslink density and elongation at break can improve the high temperature tearing performance of nitrile rubber during vulcanization. From the formulation point of view, reduce the crosslinking density of the rubber compound, increase the elongation at room temperature, reduce the amount of sulfur 2YLYY816 and accelerator, use liquid nitrile in an appropriate amount; or use nitrile rubber and natural rubber in combination; hard carbon black can also be used , Improve high temperature tearing performance. From the perspective of process operation, appropriately reducing the vulcanization temperature and using a release agent can also improve the high temperature tearing performance of nitrile vulcanization.
6. Delamination of nitrile rubber and EPDM rubber
The combined use of nitrile rubber and an appropriate amount of EPDM can significantly improve the ozone resistance of oil-resistant and wear-resistant rubber products. In actual production, when nitrile rubber/EPDM rubber is vulcanized together, co-vulcanization is realized, which can effectively avoid delamination of NBR and EPDM.
From the perspective of formulation process, using polymers that can play an intermediary role, it is recommended to introduce rubber bonding intermediates into non-polar ethylene propylene rubber to reduce the difference in polarity; adjust the vulcanization speed to achieve co-vulcanization; or adjust the viscosity, it is recommended to use Raw rubber with little difference in Mooney viscosity; use appropriate amount of plasticizer and softener, add appropriate amount of tackifier to avoid vulcanization and delamination of nitrile rubber and EPDM rubber. From the point of view of process operation, the use of flaky fillers in the same formula should be avoided.
Improper operation of the nitrile rubber vulcanization process is prone to the above-mentioned failures. According to the cause of the failure, a suitable solution can be found. Later, the editor will have the opportunity to continue discussing with you the key points and precautions of vulcanization of nitrile rubber products.
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