plastic:
Plastic is a high molecular compound polymerized by addition polymerization or polycondensation reaction with monomer as raw material. It has medium resistance to deformation and is between fiber and rubber. Agents, colorants and other additives.
The main component of plastic is resin. Resin refers to a polymer compound that has not been mixed with various additives. The term resin was originally named after the lipids secreted by animals and plants, such as rosin and shellac. Resin accounts for about 40% to 100% of the total weight of plastic. The basic properties of plastics are mainly determined by the nature of the resin, but additives also play an important role. Some plastics are basically composed of synthetic resins, with no or few additives, such as plexiglass, polystyrene, etc.
Carbon black:
Carbon black, also known as carbon black, is an amorphous carbon. Light, loose and extremely fine black powder with a very large surface area, which is the product of incomplete combustion or thermal decomposition of carbonaceous substances (coal, natural gas, heavy oil, fuel oil, etc.) under the condition of insufficient air. The one made from natural gas is called "gas black", the one made from oil is called "lamp black", and the one made from acetylene is called "acetylene black". In addition, there are "trough black" and "furnace black". According to the performance of carbon black, there are "reinforcing carbon black", "conductive carbon black", "wear-resistant carbon black" and so on. It can be used as a black dye, used in the manufacture of Chinese ink, printing ink, paint, etc., and also used as a reinforcing agent for rubber.
Carbon black for plastics:
Carbon black is a plastic colorant, anti-ultraviolet aging agent and antistatic agent. With the development of the plastics industry, the amount of carbon black used in the plastics industry has gradually increased. Taking the change in the composition of carbon black consumption from 1970 to 1990 in the United States as an example, It can be seen that the growth rate of carbon black for plastics is the fastest. my country's plastics industry has developed rapidly. According to the planning of the plastic industry, the annual output of plastic products and the consumption of synthetic resin and carbon black in my country are increasing.
Compared with carbon black for rubber, although the amount of carbon black for plastics is not much, it has a greater impact on the properties of plastics, so the quality requirements for carbon black for plastics are stricter. Plastic products with different uses have different requirements on the properties of carbon black, but like other plastic pigments, they have the following common requirements.
1. Bright tone and strong coloring power. 2. Good dispersibility. 3. Good heat resistance and weather resistance. 4. Good extraction resistance and migration resistance. 5. Does not affect the hardening properties of plastics (thermosetting resins). 6. Does not affect the formability of plastics. 7. Does not reduce the mechanical strength of plastics. 8. Does not reduce the electrical properties of plastics. 9. Non-toxic and pollution-free.
Compared with other organic or inorganic pigments, carbon black has better properties except that it is difficult to disperse. In applications with high antistatic or conductive properties, it will have a certain impact on the mechanical properties of plastics. Carbon black is basically non-toxic, but it is easy to fly and pollute, so it is often used in the plastic industry in the form of masterbatch, which improves the dispersion of carbon black in plastics while eliminating pollution.