Common reclaimed rubbers on the market include tire reclaimed rubber, latex reclaimed rubber, butyl reclaimed rubber, nitrile reclaimed rubber and EPDM reclaimed rubber. EPDM reclaimed rubber has high temperature resistance and good anti-aging properties, so its vulcanization temperature ratio Other types of products should be high. Rubber products manufacturers can increase the production efficiency of EPDM recycled rubber products by increasing the vulcanization temperature. However, in actual production, too high vulcanization temperature will also bring side effects to the rubber compound, such as vulcanization. , physical properties are reduced, etc., which requires a reasonable formula to coordinate the relationship between the vulcanization temperature of the EPDM product, the quality of the vulcanizate and the production efficiency.
1. Select high-capacity EPDM reclaimed rubber
The EPDM rubber is processed from EPDM rubber and waste EPDM rubber. It retains the excellent high temperature resistance and anti-aging properties of EPDM rubber. The higher the rubber content, the higher the product resistance. The better the low temperature performance; when high temperature rapid vulcanization is used to produce EPDM rubber products, the EPDM reclaimed rubber with high gel content should be selected as much as possible.
2. Design a reasonable vulcanization system
The low-concentration main chain modifier network commonly used in the production of EPDM reclaimed rubber products and the low-concentration main chain modifier network of the semi-effective vulcanization system have good heat resistance and good resistance to thermal aging. It can alleviate the problem of physical property degradation caused by the decrease of internal crosslinking density caused by high temperature vulcanization to a certain extent; high concentration of TMTD as vulcanizing agent, DTDM as vulcanizing agent and high-promoting low-sulfur compounding system are the most commonly used vulcanization. Agent.
When high-temperature vulcanization improves the vulcanization efficiency of EPDM reclaimed rubber, increasing the reactivity can reduce the negative effects. Therefore, the fatty acid of the main chain can be used in the vulcanization system to increase the solubility of the zinc salt, such as stearic acid and zinc oxide. Improve the vulcanization system activity and improve the vulcanization efficiency while improving the mechanical strength of the vulcanizate; in the sulfur-containing EPDM reclaimed rubber vulcanization system, the rubber product manufacturer can also increase the vulcanization efficiency by increasing the amount of the accelerator, and balance the quality of the EPDM rubber product. The relationship between vulcanization efficiency.
3. Anti-aging agent
When EPDM reclaimed rubber adopts effective vulcanization system and semi-effective vulcanization system to achieve high temperature vulcanization, it is not enough to rely solely on high-quality reclaimed rubber and reasonable vulcanization system. It is also necessary to use a suitable kind of anti-aging agent to effectively hinder the hot oxygen in the vulcanization process. The destructive effect is to improve the flatness of the EPDM reclaimed rubber compound and improve the quality of the EPDM rubber products.
In addition, when EPDM reclaimed rubber is selected for high-temperature rapid vulcanization, it is necessary to use an appropriate amount of anti-scorching agent to effectively prevent the occurrence of scorch and improve the quality and yield of EPDM rubber products, which will not be elaborated here. High-temperature rapid vulcanization As a common method for manufacturers of rubber products to improve production efficiency, we must pay attention to the actual operation process: Do not blindly increase the heating efficiency, it must be determined by "glue".