At present, the raw materials of butyl rubber products on the market are not only domestic and foreign brands of butyl rubber, but also butyl reclaimed rubber processed from waste butyl inner tube. The butyl reclaimed rubber is on the index and butyl rubber. Almost, the price is lower than that of butyl rubber, and the replacement of butyl rubber can significantly reduce the cost of raw materials. However, there are still some differences in terms of molecular structure, mixing process, and vulcanization properties.
Butyl rubber is made of isobutylene and isoprene. The linear polymer has good air tightness, heat resistance and chemical resistance, but the vulcanization rate is slow. The butyl reclaimed rubber is the waste butyl inner tube through desulfurization. Recycled resources processed by multiple processes such as filtration and molding retain the low permeability, heat resistance and aging resistance of butyl rubber. However, since butyl reclaimed rubber is a renewable resource and contains a certain amount of soluble rubber, insoluble gel, free sulfur, resin and vulcanization system residue, butyl reclaimed rubber has smaller molecular chain than butyl rubber and irregular molecular size. The produced butyl reclaimed rubber has higher polarity and higher vulcanization activity, so it needs to be discussed in the course of use.
Butyl rubber is used as the main raw material to produce butyl rubber products. It needs to add carbon black, cross-linking agent, anti-aging agent, etc. Under the action of cross-linking agent, the original linear structure of butyl rubber becomes a three-dimensional network structure. The elasticity is smaller, and the heat-resistant oxygen aging performance is more stable; in the production process, the butyl reclaimed rubber needs to pulverize, screen, and remove the waste butyl inner tube, and then break the cross-linking network through the regeneration process, thereby regaining plasticity, but The fillers and auxiliaries in the base reclaimed rubber cannot be removed. Therefore, the butyl reclaimed rubber product needs to react with the newly added various compounding agents in the production process, and also cross-links with its own compounding agent.
Compared with butyl rubber, butyl reclaimed rubber has a faster vulcanization rate, higher compatibility with other types of rubber, and better aging resistance. For example, when butyl reclaimed rubber and natural rubber are used together to produce rubber products, Base reclaimed rubber (mainly radiation butyl reclaimed rubber) can be used in combination with natural rubber at any ratio (optimally controlled below 50 parts) to significantly improve the aging resistance, heat resistance, gas permeability and rubber resistance of rubber products. Product raw material cost.
Compared with butyl rubber, butyl rubber is a recycling material that needs to be properly controlled in the production of high-grade butyl products. High-quality butyl reclaimed rubber can generally replace more components of butyl rubber to produce rubber products, reducing the cost of production.