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The application of carbon black in rubber industry
2024-05-13 16:00:49
Carbon black is a common carbonaceous black powder with high adsorption, electrical conductivity and wear resistance, so it has been widely used in the rubber industry.From automotive tires to seals, the widespread use of carbon black is significantly improving the performance and durability of rubber products, driving the entire industry to new heights.
Reinforcing filler: improve the strength and durability of rubber products
As a kind of reinforcing filler, carbon black can greatly improve the mechanical strength and wear resistance of rubber products. In rubber production, carbon black particles form a reinforced network structure by tightly combining with the rubber matrix, which significantly improves the tensile strength and tear strength of rubber. Especially in tire manufacturing, the role of carbon black is particularly prominent.
Anti-ultraviolet and anti-aging: prolong the service life of rubber products
In addition to mechanical reinforcement, carbon black is also widely used in rubber products due to its excellent UV resistance. Rubber materials will age when exposed to sunlight for a long time, showing surface cracking, hardening and loss of elasticity. Carbon black can effectively absorb and shield UV rays, thereby slowing down these aging processes.
The anti-aging property of carbon black not only prolongs the service life of rubber products, but also reduces the frequency of product maintenance and replacement, and reduces the use cost. At the same time, due to the improved durability of rubber products, the overall resource consumption and waste generation are also reduced, helping to achieve environmental goals.
Different types of carbon black applications:
N330 is the most widely used high wear resistant carbon black,this product is used for tire tread, cord rubber, tire side and various rubber industrial products. It is a kind of carbon black with good reinforcement performance, which can give the rubber compound good tensile properties, tear resistance, wear resistance and elasticity.
N220 is suitable for all kinds of rubber, the wear resistance is 10%-20% higher than N330, can give high tensile strength and tear strength, and has a certain electrical conductivity. It is mainly used for tread rubber of load tire and passenger tire, and rubber products that need high strength and high wear resistance.
N550 is suitable for natural rubber and all kinds of synthetic rubber. It is easy to disperse, can give the rubber material high stiffness, fast pressing speed, small mouth expansion, smooth pressing surface. It is mainly used in tire cord rubber, tire side, inner tube and pressing and calendering products.
N660 this product is suitable for all kinds of rubber, compared with semi-reinforced carbon black, it has a higher structure, fine particles, easy to disperse in the rubber, vulcanized rubber tensile strength, tear strength and secondary stress is higher, and deformation is small, low heat generation, elasticity and flexure resistance performance is good. Mainly used for tire and wheel curtain tape, inner tube, bicycle, hose, tape, cable, shoes and calendering products, model products, etc.
Selection of rubber carbon black dosage
The amount of rubber carbon black in the compound will directly affect the properties of vulcanized rubber, such as strength, wear resistance, hardness, elongation, flexural resistance, etc., there is an optimal amount of carbon black.
Therefore, in the formulation design, the reasonable choice of carbon black dosage is very important, therefore, according to the requirements of performance, grasp the main contradiction, take into account other, reasonable choice of carbon black dosage.
Generally speaking, when the interaction between rubber carbon black aggregates in the rubber compound begins to increase sharply, the amount of rubber carbon black is the best amount. The smaller the particle size of rubber carbon black is, the greater the surface activity is, the higher the structure is, and the amount of carbon black tends to decrease when the maximum tensile strength is reached. Usually, the amount of carbon black in 40-60 parts can give rubber products better performance indicators. The best matching amount is about 20%-23% for hard carbon black and about 23%-26% for soft carbon black.
When determining the filling amount of rubber carbon black, it is necessary to consider the temperature in the mixing process to determine the optimal matching amount.
Remember not to add too much rubber carbon black, which will affect the physical properties of vulcanized rubber, reduce the interaction between rubber carbon black and rubber, and reduce the tensile strength of rubber products produced. Because the excessive use of rubber carbon black will make the dispersion of carbon black is not uniform enough condensation.
This is the most detailed explanation on the application of carbon black in rubber.