According to the supply of stearic acid (octadecanoic acid): stearic acid (octadecanoic acid) is a natural rubber, A widely used vulcanization activator in synthetic rubber and latex, it can also be used as a plasticizer and softener. In the process of producing synthetic rubber, stearic acid needs to be added as an emulsifier. When manufacturing foam rubber, stearic acid can be used as a foaming agent. Stearic acid can also be used as a release agent for rubber products. Stearic acid plays an important role in the synthesis and processing of rubber.
1. The role of stearic acid in the rubber (tire) processing and production process:
During rubber processing, stearic acid is used as an auxiliary plant latex, and the proportion added is very small. Usually, 0.5-3 parts of stearic acid are added for every 100 parts of rubber, but it is indispensable. of. As vegetable oil-based fatty acids, when added in a certain proportion during the processing of rubber (tyre), they have the following four functions:
1. Softening and plasticizing effects; this is an essential part of rubber processing.
2. As an external lubricant;
3. Conducive to the full diffusion of carbon black, white carbon black and zinc oxide;
4. With zinc oxide or The alkaline accelerator reaction can promote its activity, and it is also the main vulcanization accelerator and can play the role of a second accelerator. Can accelerate hardening.
2. The role of stearic acid in the processing and production of reclaimed rubber:
Reclaimed rubber is rubber that is processed from vulcanized scraps in the production of rubber products. It has a certain degree of plasticity and can be reused. Referred to as reclaimed rubber. According to the different waste rubber used, recycled rubber is divided into outer tubes, inner tubes, rubber shoes, etc. The role of hard acid in the processing and production of reclaimed rubber has the following four aspects:
1. Reclaimed rubber is difficult to demould during the production of rubber products. In this case, adding a certain amount of stearic acid can facilitate the smooth demoulding of reclaimed rubber products. Therefore, stearic acid can be used as a release agent for reclaimed rubber products.
2. Stearic acid can adjust the Mooney viscosity (i.e. roller stick) of the reclaimed rubber during the refining process and improve the operability of the reclaimed rubber product.
3. When using recycled rubber to produce sponge foam products, stearic acid can be used as a foaming agent.
4. Adding a certain amount of stearic acid to reclaimed rubber can slow down the vulcanization speed of rubber products and prevent scorch during the vulcanization process.
5. Stearic acid can also play an activation role in hy reclaimed rubber, but it is not obvious and cannot be used as the main activator, but it can be used in conjunction with zinc oxide.
Therefore, stearic acid is an indispensable rubber additive in the production and processing of rubber products.
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