Using a chromium catalyst supported on silica gel, ethylene is polymerized under medium pressure in a loop reactor to produce high-density polyethylene.
Processing and application It can be processed by blow molding, extrusion, injection molding, etc. It is widely used in the manufacture of films, hollow products, fibers and daily sundries. In actual production, in order to improve the stability of polyethylene to ultraviolet rays and oxidation, and improve processing and use performance, a small amount of plastic additives need to be added. Commonly used ultraviolet absorbers are o-hydroxybenzophenone or its alkoxy derivatives, etc. Carbon black is an excellent ultraviolet shielding agent. In addition, antioxidants, lubricants, colorants, etc. are also added to expand the application range of polyethylene.