Natural rubber is a self reinforcing rubber with high mechanical strength. The use of reinforcing fillers such as carbon black can further improve the abrasion resistance and tear resistance of rubber. In actual production, the price of natural rubber is high and fluctuates greatly. Using natural rubber and recycled rubber in proper proportion to produce rubber products can effectively reduce the cost of raw materials on the premise of ensuring product quality. The filler system directly affects the comprehensive indicators and processability of finished products. So how to use natural rubber/recycled rubber filler system?
Rubber fillers can be divided into reinforcing fillers (such as carbon black) and non reinforcing fillers (such as light calcium, clay, etc.) according to their reinforcing properties. When producing dark colored rubber products and light colored rubber products with natural rubber/reclaimed rubber as the main raw material, the filler system selection is different.
Carbon black is the most commonly used reinforcing filler. The filling system of natural rubber/recycled rubber blends uses super wear-resistant carbon black, medium wear-resistant carbon black, high wear-resistant carbon black, etc., which can effectively improve the tensile strength and wear resistance of the blends; When the tear resistance of natural rubber/reclaimed rubber 2ELYY125 products is required to be high, it is recommended to use the black carbon black of tank or modified furnace method; It is recommended to use quick pressing furnace black, universal furnace black, semi reinforced carbon black, etc. in the filling system of natural rubber/reclaimed rubber with good elasticity and processing performance.
The particle size, structure, surface activity and pH value of carbon black will affect the physical and mechanical properties and processing properties of natural rubber/reclaimed rubber blends.
Generally, when carbon black with small particle size and large specific surface area is used, the natural rubber/reclaimed rubber blends have high tensile strength, tear resistance and wear resistance; But the hardening effect is large, the elasticity and processing technology are poor, and the fluidity is not good. High use structure (oil absorption
The carbon black with high value, natural rubber/recycled rubber compound has high hardness and elongation stress. In addition, the pH value of carbon black will affect the vulcanization rate of natural rubber/recycled rubber, and the type and amount of vulcanization system need to be properly adjusted according to the acid-base property of carbon black. Among them, it is recommended to select aftereffect accelerants such as accelerants CZ, NOBS, etc. for the rubber compound of carbon black by filling furnace method, so as to reasonably control the amount.
Many non reinforcing fillers are also used in the production of natural rubber/recycled rubber products, such as calcium carbonate, clay, clay, etc. When using natural rubber/recycled rubber and rubber to produce rubber products with low strength requirements, a large number of fillers such as clay, clay (high clay), light calcium, and rubber powder can be filled to reduce the rubber content and effectively reduce production costs.
When using natural rubber/recycled rubber products to produce black rubber products, excessive amount of calcium carbonate may cause the surface of rubber products to be gray and the glossiness to decline. When using natural rubber/recycled rubber to produce light color and color rubber products, such as natural rubber and white latex recycled rubber used to produce sports soles, it is recommended to use white carbon black, ultra-fine activated calcium carbonate, etc. as reinforcing fillers, and when necessary, use organic active agents such as diethylene glycol, glycerin, triethanolamine, polyethylene glycol, etc., with the amount of 5% - 10% of the amount of white carbon black, so as to better adjust the curing rate.
In actual production, natural rubber can be used together with natural latex recycled rubber and tire recycled rubber to produce rubber tires, sports soles, rubber plates, conveyor belts, V-belts, engineering rubber and other rubber products, effectively reducing the cost of raw rubber. Natural rubber can also be used with butyl reclaimed rubber, ethylene propylene diene monomer reclaimed rubber, nitrile reclaimed rubber, etc. to improve the special properties of rubber, such as air tightness, heat resistance, ozone resistance, oil resistance, etc. Later, Xiaobian will continue to share with you the key points of selection of coordination systems such as vulcanization system, anti-aging system, softening and plasticizing system for the production of rubber products from natural rubber/recycled rubber.
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