When using recycled rubber as the main raw material to produce rubber products, carbon black is the most commonly used reinforcement agent, which improves the tensile strength, tear strength, constant tensile stress, wear resistance, etc. of recycled rubber products, further improves the performance of recycled rubber products, and prolongs the service life. In actual production, different varieties of carbon black have different reinforcement effects in recycled rubber materials, and manufacturers of recycled rubber products need to choose one or several carbon blacks according to actual needs to improve the comprehensive indicators of recycled rubber products.
1. The role and use skills of super wear-resistant carbon black in recycled rubber products
The black particle size of the super wear-resistant furnace is in the range of 11-19nm, which is the carbon black variety with the smallest particle size, the largest specific surface area, the highest coloring strength and the highest reinforcement effect on rubber among the carbon black for rubber, which can give the best wear resistance to recycled rubber vulcanized rubber. N110 series carbon black belongs to super wear-resistant furnace black. It should be noted that the compounding of ultra-wear-resistant carbon black has high energy consumption, difficult dispersion, difficult calendering, poor cracking resistance and heat resistance, and high cost.
2. The role and usage skills of medium and super wear-resistant furnace black in recycled rubber products
The black particle size of the medium-super wear-resistant furnace is in the range of 20-25nm, the particle size is relatively small, the specific surface area is large, the coloring strength is relatively high, and the reinforcing effect on recycled rubber is relatively high. N200 series carbon black belongs to the medium super wear-resistant furnace black, the problem in the use process is that the mixing energy consumption is large, not easy to disperse, the compound heats up quickly, if the dispersion is not good, it will affect the mechanical properties of vulcanized rubber.
3. The role and use skills of high wear-resistant furnace black in recycled rubber products
The black particle size of the high wear-resistant furnace is in the range of 26-30nm, and the N100 and N200 series carbon black are hard carbon black, which has high reinforcement performance and can take into account the wear resistance and processing performance of recycled rubber materials, and is widely used in the production of rubber products. N300 series carbon black is a high wear resistance furnace black.
4. The role and use skills of fast-pressing black in recycled rubber products
The particle size of the fast-pressed black is in the range of 40-48nm, with medium reinforcement performance and good processing performance, which can give the recycled rubber better stiffness and good extrusion performance, the reinforcement performance is better than that of other high-quality carbon black, the wear resistance is better than that of groove E5LYY63 black, and the recycled rubber has good high temperature resistance and thermal conductivity, especially good elasticity and recovery. N500 series carbon black is a fast-pressing black, which uses recycled rubber to produce tire cord layers, sidewalls, inner tubes and extruded calendered products such as butyl inner tube compound, which can be used to produce fast-pressed out-of-oven black.
5. The role and usage skills of general furnace black in recycled rubber products
The black particle size of the general furnace is in the range of 49-69nm, with medium reinforcement performance and good process performance, easy to disperse in the compound, the tear strength and constant tensile stress of the recycled rubber vulcanized rubber are high, the flexural resistance and elasticity are good, and the elongation is slightly lower. N600 series carbon black belongs to the general purpose furnace black.
6. The role and usage skills of semi-reinforced furnace black in recycled rubber products
The particle size of semi-reinforced carbon black is in the range of 61-100nm, which has moderate reinforcement performance and good processing performance, which can give the recycled rubber compound low heat generation and good dynamic performance. It can be filled in large quantities in recycled glue without significantly reducing the elasticity of the compound. N700 series carbon black is a semi-reinforced furnace black, which uses recycled rubber to produce tire cords, inner tubes, bicycle tires, shock absorbing products and extrusion products.
7. The role and use skills of hot-cracking carbon black in recycled rubber products
Hot cracking carbon black is divided into fine particle and medium particle hot cracking carbon black, with particle sizes in the range of 101~200nm and 201-500nm, respectively, which is the largest particle size, the smallest specific surface area and the lowest structure among rubber carbon blacks. In the production of rubber products, it can be filled in large quantities, with good processing performance, low hardness, high elasticity, low heat generation, small deformation, good flexural resistance, and good aging resistance, but low tensile strength. N800-N900 series carbon black belongs to fine particle and medium particle hot cracking carbon black.
8. The role and use skills of conductive carbon black in recycled rubber products
The particle size of conductive carbon black is in the range of 31-39nm, with a high specific surface area and structure, and the conductivity is very good, but the reinforcement effect in the compound is not good.
When producing rubber products using reclaimed rubber, it is essential to choose the appropriate type of carbon black and reasonably control the amount according to the performance requirements of the rubber products and the manufacturer's cost budget. Later, we will share with you techniques for using carbon black in various rubber products.
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