Study on the fabrication of sulfuric acid-resistant butyl rubber for military battery linings
Abstract
This study focuses on the development of a specialized butyl rubber (IIR) material with high resistance to sulfuric acid (40% H2SO4 at 70 °C) for use as military battery linings. The effects of the vulcanization system, N330 carbon black loading, P150 paraffin oil content, and the TMQ/6PPD antioxidant systems on the mechanical properties and chemical resistance were systematically investigated. Experimental results indicated that the use of an efficient vulcanization system comprising of 2.0 phr DTDM and 1.5 phr TMTD established a robust mono- and di-sulfidic crosslink network, effectively minimizing acid-induced chain scission. The optimal formulation was identified as containing of 50 phr of N330 carbon black, 10 phr of P150 paraffin oil, and a synergistic antioxidant system comprising of 2.0 phr TMQ and 1.5 phr 6PPD. The resulting material exhibited a tensile strength of 14.5 MPa, an elongation at break of 510%, and retained 92.4% of its mechanical properties after 168 hours of accelerated aging. SEM analysis confirmed that the surface of the optimized sample maintained its structural integrity without micro-cracks, fully satisfying the technical requirements for military equipment applications.
