Application of Carbon Black in Conductive Fiber

Conductive fibers refer to fibers whose resistivity is less than 107Ω·cm in a standard state. High specific resistance conductive fibers can be used in anti-static work clothes, gloves, carpets, curtains, vehicle interior decoration, computer room studios, hospitals and other places that require shielding from static electricity. Medium specific resistance conductive fibers are mainly used in petroleum, petrochemical, coal, plastic, rubber and other industries. Low specific resistance conductive fibers are mainly used in radio, television, electronic instruments, precision equipment and other fields to prevent electromagnetic interference.

Conductive fibers are often modified by compounding non-conductive organic fibers and conductive components. This method takes advantage of the ease of formability and softness of the polymer, not only through different compounding methods and degrees of compounding to adjust the degree of electrical conductivity of the fibers, but also through the degree of molecular orientation within the polymer. its anisotropy of electrical conductivity.

The basic preparation method of carbon black conductive fiber

1. Surface coating method

Conductive fibers can be obtained by coating carbon black powder with a binder on the surface of the fibers and then curing them. The fibers prepared by this method have good electrical conductivity, but poor dyeability and durability, low yield and high cost.

2. Composite spinning method

Using the method of mixing or mixing, carbon black is uniformly dispersed in the matrix polymer to form a conductive component, and then compounded and spun with a non-conductive component (main polymer) to prepare a composite conductive fiber. The base polymer of the conductive component includes polyamide, polyester, polyethylene, polyethylene glycol and the like. The non-conductive components can be the same polymer, or two or more polymers can be selected.

Typical conductive fiber process

Carbon black composite conductive fibers with carbon blacks (acetylene black, channel carbon black, furnace black, thermal cracking carbon black, soft carbon black, etc.) as conductive components are among the industrialized conductive fibers. largest variety. The carbon black used in it requires low resistivity and can be well dispersed in the matrix polymer (polyamide, polyethylene, polyoxyethylene, fatty acid polyester, etc.). The content of carbon black in the conductive component depends on the matrix polymer and the type of carbon black. Generally, when the content of carbon black is between 3% and 40%, the spinning can be ensured smoothly, and the mechanical properties of the fiber will not be greatly reduced. As the non-conductive component, fiber-forming polymers such as polyethylene terephthalate, polyamide, polyurethane, and polyacrylonitrile can be used. Due to the addition of carbon black, the appearance of the conductive fiber is black. In order to reduce the limitation of the black appearance on the application range, carbon black composite conductive fibers with different composite shapes and cross-sectional shapes can be designed and manufactured.