Conductive carbon black refers to carbon black with low or high resistance properties, which can impart certain conductivity and antistatic effects to rubber or plastic products. It is a product of incomplete combustion of carbon-containing raw materials (petroleum and petroleum by-products, etc.).
The production process of conductive carbon black:
At present, there are two processes for conductive carbon black. One is made from acetylene gas, which has high electricity cost and good conductivity, and is widely used in batteries. One is produced by heavy oil pyrolysis process or exhaust gas from chemical fertilizer plants. It has high electrical conductivity and specific surface area, and is widely used in the rubber, plastic and cable industries.
The resistance of conductive carbon black is not single, and there are differences in different products:
1. For example, in silicone rubber, when the amount of conductive carbon black added is about 10%, the resistivity can reach 103~104Ω; when the amount of conductive carbon black added is about 20%, the resistivity can reach 100~101Ω.
2. In low-density polyethylene, when the amount of conductive carbon black is about 10%, the resistivity is 104-105Ω;
3. In polypropylene, when the amount of conductive carbon black is about 5-8%, the resistivity is 104-105Ω;
4. In polyvinyl chloride, when the amount of conductive carbon black is about 15%, the resistivity is 103-104Ω; when the amount of carbon black is about 25%, the resistivity is less than 100Ω.
5. In the paint, when the amount of conductive carbon black added is about 5%, the resistivity is 105~106Ω;
It can be seen that the addition amount of ordinary conductive carbon black is mostly around 100Ω, while superconductive carbon black only needs 1/2 to 1/5 of the amount of ordinary conductive carbon black to achieve the same effect, with less dosage and good conductivity , Has no effect on rubber, plastic and other materials.
Of course, the amount of conductive carbon black affects the final effect. It is not that the more the amount, the better. A reasonable amount needs to be calculated by professionals.