Influence of environmentally friendly Phytonorman oils on the adhesive properties of frost-resistant rubbers based on nitrile butadiene rubber

The use of plasticizers based on esters of various acids most effectively improves the processing of rubber compounds and the frost resistance of NBR-based rubbers. In this work, as a plasticizer, products based on vegetable raw materials were tested - Phytonorman oils produced by the Biochemical Holding ORGKHIM, which are di- and triglycerides containing fatty acids of tall oil. Model rubber compounds based on BNKS-18AMN contained 10, 20, 30 wt. including eco-oils of the Phytonorman 212 and Phytonorman 213 brands, a mixture without oil and with 10 wt. including dibutyl phthalate (DBPh). To assess the effect of the type and dosage of eco-oils on the properties of rubbers and rubber compounds, methods for studying technological, physical-mechanical and adhesive properties were used. Determination of frost resistance, a comparison was made of methods for determining the glass transition temperature: differential scanning calorimetry (DSC) and thermomechanical analysis (TMA, Fourier). When using vegetable oils Phytonorman -212 and Phytonorman -213, the technological properties of rubber compounds are significantly improved compared to the mixture without oil and are on the same level with DBPH traditionally used in nitrile rubbers. It has been established that the introduction of Phytonorman 213 eco-oil into the formulations of rubber compounds based on BNKS 18AMN up to 10 wt. hours allows you to improve the technological parameters, as well as lower the glass transition temperature of rubber. At the same time, the physical and mechanical parameters and adhesive properties of vulcanizates are reduced by an average of 10%. It is also worth noting that rubbers with Phytonorman 213 oil are not inferior to nitrile rubbers with DBPh in terms of basic characteristics, and they are superior in adhesive properties by 27%.