Nitrile Rubber Encyclopedia

Several reasons and solutions for a large number of bubbles after nitrile rubber vulcanization 2

Create Date:2020-05-21 08:37:05Click volume:102
Several reasons and solutions for a large number of bubbles after nitrile rubber vulcanization 2

Vulcanized bubbles are a common problem in the production of rubber products. When using nitrile rubber to produce oil-resistant and wear-resistant rubber products, problems with the quality of the compounding agent and unreasonable compounding of the compounding agent will cause vulcanization bubbles. Rubber product manufacturers must strictly control the quality of raw materials, observe the progress of the vulcanization process at any time, and take certain measures to avoid the occurrence of vulcanization bubbles as much as possible.

3. Poor quality of compounding agent

The quality of the compounding agent used in nitrile rubber products is poor, and it is difficult to achieve the desired effect by sub-filling, which will cause a large number of bubbles in the vulcanized rubber. For example, the vulcanizing agent contains a large number of small molecular impurities, which will be decomposed into bubbles and remain in the rubber products in advance; or the boiling point of the plasticizer is too low, gasification will occur when the vulcanization is heated, and the generated bubbles will also remain in the rubber products . Therefore, it is necessary to check the quality of various compounding agents used in the production of nitrile rubber products before use to avoid the problem of a large number of bubbles in the nitrile vulcanizate due to the quality of the compounding agent.

4. Compounding agents react with each other to produce moisture or volatile substances

During the production of nitrile rubber products, the type and amount of compounding agent must be carefully selected. This is because some of the compounding agents may react with each other to produce moisture or volatile substances, resulting in a large number of bubbles appearing in the vulcanization of nitrile rubber compound 2LLYY521. For example, the combination of zinc oxide and stearic acid will form a certain amount of moisture. If the ratio of the two is unreasonable, a large amount of bubbles will appear on the surface when the nitrile rubber is vulcanized due to too high moisture content. Similarly, peroxides and The interaction of ketone and alcohol compounding agents will produce volatiles, which is one of the main causes of bubbles on the surface of rubber products.

5. Irrational setting of vulcanization system

The vulcanization system determines the vulcanization speed and degree of vulcanization of rubber products. When nitrile rubber is vulcanized, the amount of vulcanizing agent is insufficient, the activity of the vulcanization system is insufficient, and the vulcanization speed of the vulcanization rubber is slow. A large number of bubbles appeared on the surface. Therefore, rubber product manufacturers need to adjust the vulcanization system reasonably, appropriately increase the amount of vulcanizing agent and accelerator, or use two or more accelerators to better coordinate the vulcanization rate; rubber product manufacturers can also appropriately increase the amount of zinc oxide (while reducing the hardness The amount of fatty acid to avoid excessive moisture), improve the activity of the vulcanization system, and then increase the speed of vulcanization.

In summary, when designing formulations for nitrile rubber products, not only the specific needs of the product but also the interaction between the compounding agents need to be comprehensively considered. Will the combination produce moisture or volatile matter? Improperly generated moisture and volatile matter, effectively avoiding a large number of bubbles in nitrile vulcanizate.