Rheological Properties and Stability of Emulsion Explosive Matrix

摘要

An investigation was performed into the rheological properties and stability of emulsion explosive matrix with different surfactants. The surfactants were oligomers of the polyisobutylene succinic anhydride (PIBSA) based on different head group and relative low molecular weight sorbitan monooleate (Span 80). The viscosity, shear stress, and storage modulus of emulsion explosive matrix depend on the nature of surfactants. It was shown that the matrix formed by Span 80 has a lower viscosity, shear stress, and storage modulus, compared with the PIBSA-based surfactants, especially the blended surfactant of Span 80 and PIBSA-TEA. The result of the precipitation of ammonium nitrate (AN) and the change of storage modulus with time show that the strength of interfacial film formed by Span 80 is weak. This allows the crystal of AN to pass through the interfacial film more easily; thus, the stability of the matrix is decreased. However, the storage modulus in aging was approximately constant and the ratio of the precipitation of AN is the lowest when the matrix was stabilized by blended surfactant. It shows that the matrix formed by blended surfactant has a better stability than single surfactants.