Preparation and application of compositions based on butadiene-nitrile elastomer modified with chloromethylated heavy pyrolysis resin

Abstract

       It is known that butadiene-nitrile rubber (BNR) is a rubber with great potential in industry. The reason for this is that it is easy to process, and the price is cheaper than other synthetic rubbers, it has high resistance to oils and fuels, and low gas permeability. About 80% of the produced BNK is used for machine building and automobile industry. However, the unsaturation of the main chain of butadiene leads to poor resistance to thermal wear and limits the field of application. To overcome this, prospective methods of preparation and application of various compositions based on BNK have been investigated for many years.

       The EP-300 unit operates in our republic at the "Ethylene-Polyethylene" plant. As a result of the pyrolysis process carried out in the unit, 4-6% heavy pyrolysis resin is formed as a by-product, the composition of which is 75% polycyclic aromatic hydrocarbons. Naphthalene makes up 20% of polycyclic aromatic hydrocarbons. Heavy pyrolysis resin contains polycyclic aromatic hydrocarbons. As a result of chloromethylation of polycyclic aromatic hydrocarbons (naphthalene, anthracene, methylnaphthalene, phenanthracene) contained in heavy pyrolysis resin, β-chloromethylnaphthalene is formed. The properties of butadiene-nitrile elastomer with β-chloromethylnaphthalene have been improved and applied in various fields.