When using butyl rubber or butyl reclaimed rubber to produce rubber products, carbon black is a commonly used reinforcing filler, which can improve the mechanical strength of the rubber and improve the process performance. In actual production, fast pressing black, semi-reinforcing carbon black, and high wear-resistant carbon black are widely used in butyl rubber products. Different types of carbon black have different effects on the physical properties of butyl rubber or butyl reclaimed rubber. Rubber product manufacturers can choose suitable carbon black products in combination with the effect of carbon black in the rubber compound and the specific needs of butyl products.
1. Carbon black varieties and physical properties of butyl rubber
In the production of butyl rubber or butyl reclaimed rubber products, theoretically, the more carbon black is used, the tensile stress and hardness of the vulcanized rubber will increase, and the elongation of the vulcanized rubber will decrease; the extruding performance of furnace carbon black It is better than channel carbon black and thermal cracking carbon black 2YLYY524. Because butyl rubber has low unsaturation and poor interaction with rubber fillers, carbon black has a poor reinforcing effect on butyl rubber, but it can improve the processing performance of butyl rubber.
①Small particle size carbon black: small particle size carbon blacks such as super abrasion-resistant furnace black, super abrasion-resistant furnace black, high abrasion-resistant furnace black and miscible channel black are used in the production of butyl rubber or butyl reclaimed rubber products. Improve the tensile strength and tear strength of butyl vulcanizate.
② Thermal cracking carbon black: The butyl vulcanizate reinforced by carbon black with a larger particle size, such as fine-particle thermal black and medium-particle thermal black, has a higher elongation.
③Semi-reinforcing carbon black: When this type of carbon black is used as a butyl rubber filler, the compression set of vulcanized rubber is better, which is better than other types of carbon black.
④Quick-pressed furnace black: It has the dual functions of strengthening and improving processing performance. The butyl vulcanizate using fast pressing black has better high temperature resistance, better thermal conductivity, excellent elasticity and resilience performance, and the surface of the extruded semi-finished product is smooth and generates less heat.
2. Specific application effects of carbon black in butyl rubber/reclaimed rubber products
In actual production, the performance requirements of butyl rubber or butyl reclaimed rubber products in different applications are different, and different carbon black reinforcements are required. As a typical butyl rubber product-butyl inner tube, semi-reinforcing carbon black is generally used in the production process, with an appropriate amount of high wear-resistant furnace black; heat-resistant conveyor belts and other butyl products that have strict requirements on rubber elasticity You can choose fast pressing black reinforcement.
With the continuous advancement of butyl reclaimed rubber production technology and equipment, butyl reclaimed rubber is more and more widely used in butyl rubber products; when butyl reclaimed rubber is used alone or combined with butyl raw rubber to produce butyl rubber products, Rubber product manufacturers need to appropriately adjust the variety and dosage of carbon black according to actual needs to reduce more raw material costs while ensuring quality.
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