Chlorinated butyl reclaimed rubber has excellent air tightness, shock absorption, weather resistance, heat resistance, etc. It is an ideal raw material for the production of automobile tires and shock-absorbing rubber products. It can be used alone or with butyl rubber, The combination of chlorobutyl rubber can effectively reduce the cost of raw materials on the premise of ensuring the quality of the products. When using chlorinated butyl reclaimed rubber to produce shock-absorbing rubber and other products, the requirements for the flexural resistance of the rubber are strict, so what measures can manufacturers take to further improve the flexural resistance of chlorinated butyl reclaimed rubber products?
1. Reasonable design of vulcanization system to improve flexural resistance of chlorobutyl reclaimed rubber products
To improve the flexural resistance of chlorobutyl reclaimed rubber products, it is recommended to use thiuram accelerators, NA-22 accelerators, resins or EZ vulcanization systems. it is good. It should be noted that when zinc oxide, thiuram-thiazole or sulfur vulcanization system is used, the chlorobutyl reclaimed rubber vulcanizate has poor flexural resistance, and the above vulcanization system is not recommended for the production of shock absorption products and automobile tires.
2. Reasonable design of reinforcement system to improve flexural resistance of chlorobutyl reclaimed rubber products
Carbon black is a commonly used reinforcing agent in the production of chlorinated butyl reclaimed rubber products. General furnace black (N600 series) has moderate reinforcing performance and good processing performance, and is easy to disperse in the rubber compound, and the vulcanizate has good flexural resistance and elasticity; quick-pressing furnace black (N550 series) can give the rubber compound good performance. Stiffness and extrusion properties, vulcanizate has good high temperature resistance, thermal conductivity, elasticity and recovery; semi-reinforced carbon black (N700 series) has moderate reinforcing properties and good processing properties, which can impart low heat generation to vulcanizates and good dynamic performance.
When using chlorinated butyl reclaimed rubber to produce rubber products, it is recommended to use carbon black with moderate reinforcing properties such as general furnace black, fast-pressing furnace black, and semi-reinforced carbon black, and the finished product has better flex resistance.
3. Reasonable design of softening system to improve flexural resistance of chlorobutyl reclaimed rubber products
In the production process of chlorinated butyl reclaimed rubber products, the variety and amount of softeners and plasticizers will also affect the flexural resistance of the finished products. For example: When using chlorobutyl reclaimed rubber to produce rubber inner tubes, it is recommended to use a low carbon black to oil ratio, and the vulcanizate can obtain better flex resistance when the tensile stress is lower.
4. Adjust the production process parameters to improve the flexibility of chlorinated butyl reclaimed rubber products
When using chlorinated butyl reclaimed rubber to produce rubber products, proper adjustment of the production process parameters can also improve the flexural crack resistance of the reclaimed rubber products, especially the mixing and vulcanization processes. In actual production, if the rubber filler and vulcanizing agent do not reach the optimal dispersion degree, flexural cracks will be caused due to the structure to ensure uniform dispersion of the compounding agent; insufficient or excessive mixing during mixing will cause early damage , it is necessary to control the mixing time and mixing temperature reasonably; it is recommended to use low temperature and long time vulcanization during vulcanization to obtain better flexural resistance.
In actual production, when improving the flexural resistance of chlorinated butyl reclaimed rubber products, corresponding antioxidants can also be used, and the editor will continue to discuss related issues with you later.
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