Preparation and properties of marine high-damping nitrile rubber/phenolic resin/chlorinated paraffin composites

Phenolic resin (PF) was combined with nitrile rubber (NBR) as vulcanizing agent and blend respectively, the effects of PF amount on mechanical properties, damping properties and oil resistance of NBR were studied, and chlorinated paraffin (CP 52) was introduced into it to prepare NBR/PF/CP 52 ternary composites with high damping properties at room temperature. The results showed that PF could significantly broaden the effective damping temperature range of NBR and shift glass transition temperature of NBR to high temperature. Compared with NBR/PF blend, the vulcanizate prepared with PF as vulcanizing agent had better mechanical strength and oil resistance. The tensile strength and tear strength of the vulcanizate with 50 phr (mass) PF were 23.27 MPa and 38.47 MPa respectively, and the mass changerate was only 1.36% after 72 h of hot oil immersion, meeting the requirements of engineering application. CP 52 could further enhance the damping properties of the composite by forming a strong intermolecular van der Waals force with NBR. When m(NBR)/m(PF)/m(CP 52) was 100/50/75, the effective damping temperature range of the composite was -9-45.5 ℃, and the peak value of loss factor was up to 1.48, which had excellent damping properties at room temperature