Butyl recycled rubber has good air tightness, heat resistance, chemical corrosion resistance, the price is much lower than that of butyl rubber, plasticity, fluidity, vulcanization performance and other aspects are better than butyl rubber, easy to mix with other rubber and compounding agents, can be used alone or with butyl rubber, EPDM rubber and other products to reduce costs. Butyl reclaimed rubber is used as the main raw material to produce rubber products, and rubber reinforcing agents and fillers have a significant impact on its physical properties.
1. Effect of rubber reinforcing agent on the physical properties of butyl reclaimed rubber
The main function of rubber reinforcing agent is to improve the mechanical properties of rubber, including tensile strength, tear strength and wear resistance. Carbon black is the most commonly used reinforcing agent in the production of rubber products using butyl reclaimed rubber, and different varieties of carbon black have different effects on the physical properties of butyl reclaimed rubber.
From the perspective of carbon black varieties, high wear-resistant carbon black can significantly improve the tensile strength and tear strength of butyl reclaimed rubber vulcanized rubber, and the common variety is carbon black N330; Semi-reinforcing carbon black can endow butyl reclaimed rubber vulcanized rubber with excellent compression set, and is a commonly used reinforcing agent for butyl rubber inner tubes, such as N774; The fast pressing furnace has good black resilience, which can improve the surface smoothness of the semi-finished products of butyl reclaimed rubber products, and has less calorific value, such as N550.
From the perspective of carbon black particle size, carbon black with small particle size (such as SAF, ISAF, HAF, MPC) can improve the tensile strength and tear strength of butyl reclaimed rubber vulcanized rubber; Carbon blacks with larger particle sizes (such as FT and MT) can increase the elongation of recycled rubber vulcanized rubber.
2. Effect of rubber filler on the physical properties of butyl reclaimed rubber
Rubber fillers are mainly used to reduce costs, improve processing properties and adjust the physical properties of rubber, and the commonly used white fillers for butyl reclaimed rubber products are silica, calcium carbonate, talc and clay.
Silica is the product with the best reinforcing effect among white fillers, and silica can be used to fill rubber products with high requirements for strength and wear resistance when using butyl reclaimed rubber. Flake talc can significantly improve the tensile strength and tensile stress of butyl reclaimed rubber vulcanized rubber. When a large amount of calcium carbonate is filled in butyl reclaimed rubber products, it can reduce the elongation E4LYY412 and elastic loss, which helps to reduce costs, and it is necessary to pay attention to the changes in tensile strength, hardness and other indicators. The reinforcing effect of clay is greater than that of calcium carbonate, but the vulcanization may be delayed due to the pH value, so it is recommended to add a small amount of diethylene glycol (DEG).
When using butyl reclaimed rubber to produce rubber products, the variety and amount of reinforcing agent and filler directly affect the physical properties of reclaimed rubber vulcanized rubber; In-depth understanding of the influence of reinforcing agents and fillers on the performance of butyl reclaimed rubber can further optimize the performance of butyl reclaimed rubber and meet the application needs of different types of butyl rubber products, which is the key to expanding the use of butyl reclaimed rubber, producing high-performance rubber products and reducing costs.
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