With the development of the plastics industry, the amount of carbon black in the plastics industry is also increasing. From ordinary daily-use plastics to high-end engineering plastics, carbon black is inseparable. Different industrial plastics use carbon black to play different roles. Here I will introduce the use and function of carbon black for industrial plastics.
The use of carbon black in industrial plastics
Carbon black can be used in many places in industrial plastics, such as plastic black masterbatch, plastic foam, leather plastic, black masterbatch, black color masterbatch, anti-static industrial plastics, color paste and colored sand, etc., which are usually used in industrial plastics It is the use of color masterbatch, and carbon black is an important black dye for color masterbatch.
The role of adding carbon black to industrial plastics
Carbon black is a plastic colorant, anti-ultraviolet aging agent and antistatic agent. Carbon black plays different roles in the plastics industry according to its dosage. However, the effects of adding carbon black to common industrial plastics include coloring, ultraviolet absorption, and electrical conductivity.
(1) Coloring effect. Carbon black is a common cheap and high-quality black pigment. Adding carbon black to industrial plastics can add 0.1% carbon black to play a coloring effect. The thinner the plastic, the more the amount needs to be added, and vice versa.
(2) UV absorption, its application in plastics shows quite obvious UV protection. The surface area of pigment carbon black increases with the decrease of its particle size, but the decrease of particle size reduces the dispersibility. Therefore, in order to obtain the best ultraviolet absorption effect, it is necessary to sufficiently disperse the carbon black. In order to achieve the anti-ultraviolet effect, the general addition amount is 2.5%-3%, so as to prolong the service life of plastic products outdoors.
(3) Conduction, the structure of carbon black is similar to the real graphite lattice. If carbon black is mixed into plastics, when a certain concentration is formed, the aggregates will join together to form agglomerates, then the current can pass through all possible contact points , so that the volume resistance of the plastic drops rapidly. Depending on the variety of conductive carbon black in plastics, adding 10%-25% can achieve different resistances.