Sulfur carrier vulcanization is one of the vulcanization systems commonly used in the production of rubber products at present, which can reduce the sulfur ring compounds inside the vulcanizate molecules and improve the heat resistance and tear resistance of the vulcanizate. When using nitrile rubber or nitrile reclaimed rubber to produce oil-resistant and wear-resistant rubber products, many products have strict requirements on the heat resistance and tear resistance of the rubber. It is possible to choose sulfur carrier vulcanization and add appropriate compounding agents. Improving the overall performance of rubber products can reduce the tendency of vulcanized rubber to pass through sulfur.
Nitrile rubber / recycled rubber products choose sulfur carriers for vulcanization. Most of the thiuram polysulfides or morpholine polysulfides are used. During the vulcanization process, active sulfur is decomposed to participate in the vulcanization reaction. Because the sulfur content of different kinds of sulfur carrier compounds and the ability to decompose sulfur are different, the vulcanization process and vulcanization effect in the nitrile rubber compound vary greatly, and it is necessary to select an appropriate sulfur carrier vulcanization according to actual needs.
The nitrile rubber / recycled rubber vulcanizate vulcanized with sulfur carrier has excellent heat aging resistance. It is necessary to pay attention to the types of sulfur carrier compounds. For example, when using TMTD or TRA vulcanization, scorch and blooming are easy to occur. Low, large compression deformation, need to mix with other compounding agents.
To avoid scorch and blooming problems caused by vulcanization of nitrile rubber compounds with sulfur carrier compounds, rubber product manufacturers can add an appropriate amount of rubber accelerator CZ or accelerator DM to the formula to reduce the scorch and spray of nitrile rubber / recycled rubber vulcanizates. Frost tendency.
When using TMTD vulcanization for nitrile rubber / recycled rubber, vulcanized rubber has good tear resistance and excellent aging resistance in hot air, steam, and hot oil. However, vulcanized rubber has low mechanical strength, poor dynamic fatigue performance, and large permanent deformation. Adding a small amount of sulfur can further increase the vulcanization degree of nitrile vulcanizate, increase tensile strength and tensile strength, reduce compression set and dynamic fatigue heat generation; but in actual production, excessive use of sulfur 2LLYY0106 will reduce nitrile vulcanization The heat resistance of the glue, so the amount of sulfur should be controlled below 0.5 parts.
Nitrile rubber is widely used to produce oil-resistant and abrasion-resistant rubber products. Vulcanization with sulfur carrier compounds can significantly improve the heat resistance of vulcanized rubber, which in turn improves the adaptability of the nitrile rubber product to the environment and prolongs its service life.
Nitrile reclaimed rubber, as an alternative raw material for high-priced nitrile raw rubber, can effectively reduce the cost of raw materials for rubber products and produce rubber. When the nitrile rubber / recycled rubber is vulcanized with a sulfur carrier compound, it is necessary to appropriately adjust the amount of sulfur carrier compound, accelerator and even sulfur in the formula to reduce the cost and further optimize the indicators of the nitrile rubber / recycled rubber vulcanizate.