Reclaimed rubber is made from vulcanized scraps in the production of rubber products. Rubber processed from raw materials, 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.
Reclaimed rubber can partially replace raw rubber in rubber products to save raw rubber and carbon black, which is also beneficial to improving processing performance and certain properties of rubber products. performance. The regeneration process is a process in which waste rubber breaks some molecular chains and cross-linking points of vulcanized rubber under the combined action of plasticizers (softeners and activators), oxygen, heat and mechanical shear. Softeners play the role of expansion and plasticization. Commonly used softeners include coal tar, pine tar, petroleum softeners, and cracked residual oil. Activator can shorten the regeneration time and reduce the dosage of softener.
During the production and processing of reclaimed rubber, it is necessary to improve production efficiency, improve processing performance, and ensure product quality, so operating agents are needed. Operating agents include peptizers, solubilizers, plasticizers, softeners, leveling agents, lubricants, dispersants, tackifiers, lubrication aids, release agents, release agents, etc. The important ones are plasticizers, dispersants, leveling agents, tackifiers, release agents and anti-scorch agents.
Stearic acid is an essential rubber additive in the production and processing of reclaimed rubber. The stearic acid tape is supplied below. Do you want to know the role of stearic acid in the production and processing of reclaimed rubber:
1. Stearic acid can be used as a release agent for reclaimed rubber products. In the process of producing rubber products, it will If it is difficult to demould, adding a certain amount of stearic acid can help the reclaimed rubber products to demould smoothly.
2. The biggest problem of reclaimed rubber is the viscosity (i.e. roller sticking) that occurs during the start-up process. Improper proportion of recycled rubber and auxiliary materials may cause roller sticking. An appropriate amount of stearic acid can be adjusted to solve the problem of regeneration. Mooney viscosity problem.
3. When using recycled rubber to produce sponge foam products, stearic acid can be used as a foaming agent.
4. Reclaimed rubber can slow down the vulcanization speed of rubber products and prevent scorch during the vulcanization process of a certain amount of stearic acid.
5. Stearic acid can also play an activation role in 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. When zinc oxide and stearic acid work together, zinc soap will be formed, which can increase the solubility of zinc oxide in the rubber compound, and interact with the accelerator to form a complex with good solubility in the rubber compound, thereby activating the accelerator and vulcanizing agent. (mainly sulfur) to improve the vulcanization efficiency of the entire vulcanization system.
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