Rubber Chem Encyclopedia

Common reinforcing filler for EPDM rubber products

Create Date:2018-08-10 09:39:40Click volume:364
Common reinforcing filler for EPDM rubber products

EPDM rubber / reclaimed rubber is the main raw material for the production of EPDM rubber products. EPDM rubber and EPDM rubber can be used to produce rubber EPDM rubber products, which can reduce production costs and ensure product quality. When ethylene propylene rubber or reclaimed rubber is used to produce rubber products, reinforcing fillers are essential compounding agents. What are the commonly used reinforcing agents and fillers in EPDM rubber products? What is the role?

EPDM rubber has low density, large Mooney viscosity and strong filling ability. It can be filled with a large amount of rubber filler to alleviate the pressure brought by rubber products to rubber manufacturers. Filling EPDM rubber products with a large amount of filler can increase products. Volume, reduce production costs, improve the performance of EPDM vulcanizate. In actual production, commonly used reinforcing fillers for EPDM rubber products include carbon black, white carbon black, various inorganic fillers, short fibers and waste EPDM vulcanizate.

Both carbon black and white carbon black are reinforcing fillers. The internal molecular structure is basically the same except for the different colors. Generally, carbon black is used as a black and dark rubber product reinforcing agent, and white carbon black is used for light color. Translucent rubber product reinforcing agent, filler. When carbon black and white carbon black are used as reinforcing fillers for EPDM rubber products, the particle size structure, specific surface area and surface activity will affect its reinforcing performance. Generally, the smaller the particle size, the larger the specific surface area and the activity. The higher the carbon black/silica black, the better the reinforcing effect in the rubber compound, and the higher the comprehensive index of the vulcanized rubber.

The inorganic filler is a fine particulate inorganic material obtained by crushing or grading natural minerals or separating and separating chemical reactants. The price is low, the density is large, and the reinforcing performance is small, but the solvent of the rubber product can be increased, the cost is reduced, and the processing performance is improved. Commonly used inorganic fillers are light calcium, talc, clay, titanium dioxide, aluminum hydroxide, barium sulfate, etc. Among them, light calcium carbonate is easy to disperse in the rubber compound, and the reinforcing effect is poor, and it is mostly used in light-colored EPDM rubber products. Volume reduction cost; talcum powder is a white powder with a lamellar structure, acid, alkali, heat, electrical insulation, used in EPDM light rubber products, sponge rubber products and insulation products; titanium dioxide can improve EPDM rubber Weather resistance of the product; good clay reinforcing effect, heat resistance, acid and alkali resistance, electrical insulation, mostly used in white or electrically insulating rubber products; aluminum hydroxide is a commonly used filler for EPDM flame retardant rubber; barium sulfate is excellent in resistance A white powder of acid-base and chemical resistance, mainly used in EPDM rubber products with high acid and alkali resistance.

Short fiber is a segmented fiber with a length of a few millimeters and a length to diameter ratio of 100-300. Commonly used are cotton fiber, polyester fiber, polyesteramine fiber, etc., which are easy to orient in the rubber compound and can be directly filled as a filler. Improve the modulus, tear strength, wear resistance and cut resistance of rubber compound in rubber products; EPDM rubber is non-polar rubber, with low adhesion, through adhesion bonding, fiber surface treatment or phase The agent can further improve the interaction between the rubber matrix and the short fibers, and improve the reinforcing performance; the rubber products such as the EPDM conveyor belt and the brake pad are filled with a proper amount of short fibers in the production process.

Vulcanized rubber powder is a powdery elastomer processed from waste rubber products. The particle size is generally around 30-80 mesh. The density is small, the modulus is low, and the reinforcing effect is poor. It is mainly used as a bulking agent in rubber products. The vulcanized rubber powder commonly used in EPDM rubber products is tire reclaimed rubber powder and EPDM recycled rubber powder, which is mainly used as a non-reinforcing filler in waterproof coiled materials and low-grade sealing strip products. Generally, the performance of EPDM rubber products will decrease with the increase of the amount of rubber powder. Therefore, it is better to use the ultrafine pulverization technology, chlorination, grafting, corona and other techniques for surface treatment of fine particle activity when selecting vulcanized rubber powder. Rubber powder, EPDM rubber products have good comprehensive performance.