In the vulcanization process of rubber products, accelerators are often used to adjust the vulcanization speed and reduce the vulcanization temperature. In the production of rubber products, accelerators directly affect the vulcanization speed of rubber compounds and affect the yield of products. There are many types of accelerators, different accelerators, different vulcanization times, and different scorch times. So what are the commonly used accelerators?
1. Thiuram accelerator: This type of accelerator is an ultra-fast accelerator. It is an acid accelerator with short scorch time, fast vulcanization speed, uneven vulcanization curve and high vulcanization degree. Generally not used alone, it can be used together with thiazole HY29S10J2LWFM and sulfenamide accelerators to adjust the vulcanization time. Commonly used accelerators TMTD, accelerators TMTM and so on.
2. Dithiocarbamate: It belongs to the super-speed accelerator, with low activation temperature, fast vulcanization rate, high cross-linking degree, short scorch time, poor flatness, and improper vulcanization operation, which is easy to cause under-sulfur or over-sulfur. Commonly used accelerators are accelerator PZ, accelerator EZ and so on.
3. Xanthate accelerator: It is an acid accelerator with narrow vulcanization flat area and poor storage stability. Commonly used accelerator ZBX, accelerator ZIP and so on.
4. Thiazole accelerator: It is an acid accelerator. It has high vulcanization activity, good vulcanization characteristics, fast vulcanization speed, good vulcanization flatness, and medium scorch time. The vulcanizate has good comprehensive mechanical properties. The vulcanized rubber has good wear resistance, aging resistance, compression set resistance and so on. Commonly used accelerators are accelerator M, accelerator DM and so on.
5. Sulfenamide accelerator: It is an after-effect accelerator with slow vulcanization starting point, long scorch time, long vulcanization flat period, fast vulcanization rate and high activity at vulcanization temperature. Commonly used accelerators CZ, accelerators DZ, accelerators NOBS and so on.
6. Aldehyde amine accelerator: It is a weak alkaline accelerator with slow vulcanization speed and no scorch danger. The commonly used accelerator is accelerator H.
7. Guanidine accelerator: It is an alkaline, medium-speed accelerator, with a late vulcanization start, slow vulcanization speed and high operational safety. Commonly used accelerators are accelerator D, accelerator DCP, etc.
8. Thiourea accelerators: The promotion effect is slow and the anti-scorch performance is poor. Commonly used accelerator NA-22.
The vulcanization time of the accelerator is long or short, and the scorch time is long or short. In the production of rubber products, a variety of accelerators can be used together to improve the vulcanization time and the performance of the rubber compound. For example, the combination of super-speed accelerator and slow-speed accelerator can appropriately slow down the vulcanization speed and increase the scorch time, so as to achieve the required vulcanization speed and scorch time of rubber products and improve the performance of the vulcanized compound. Reasonable design of accelerator usage can improve yield and production efficiency