To investigate the influence of cottonseed oil mass fraction on the rheological properties and anti-vibration performance of site-mixed emulsion explosive matrix, samples of site-mixed emulsion explosive matrix with different cottonseed oil mass fractions were prepared. A rotational rheometer, HY-5A rotary speed-regulating vibrator, and water dissolution method were used to study the rheological properties and anti-vibration performance of the site-mixed emulsion matrix. The results show that when the mass fraction of cottonseed oil is not more than 2.5%, the viscosity of the site-mixed emulsion matrix increases gradually. In terms of the temperature environment of the pipeline of on-site mixing trucks, the viscosity of the emulsion matrix can meet the pumping requirements. The elastic modulus and cohesion increase gradually and then remain nearly stable. The anti-vibration performance first increases and then decreases, and when the cottonseed oil mass fraction is 2.0%, the anti-vibration performance is the best.

To enhance the heat-resistant performance of on-site mixed emulsion explosives, four kinds of on-site mixed emulsion explosive matrix samples were prepared by adding ammonium formate with different concentrations into corresponding aqueous phase system, respectively. The fluidity, viscoelasticity, viscosity-temperature, and thermal decomposition properties of the four kinds of samples were investigated through rotational rheometer and synchronous thermal analyzer. The results revealed that the addition of ammonium formate increases the viscosity of the on-site mixed emulsion matrix, and the viscosity of the four kinds of samples exhibits a trend of first increase and then decrease with the increase of ammonium formate mass fraction. Compared with the sample without ammonium formate, the addition of ammonium formate improve the elastic modulus of the emulsion matrix and enhances its stability. When the mass fraction of ammonium formate is not greater than 9%, the viscosity of the emulsion matrix at around 50 ℃ meets the pumping requirements. The addition of ammonium formate shows no significant influence on the thermal decomposition process of the emulsion matrix. However, as ammonium formate mass fraction increases, the extrapolated initial decomposition temperature, activation energy, thermal explosion critical temperature, as well as self-accelerating decomposition temperature all increase, leading to improved thermal stability and thermal safety of the on-site mixed emulsion matrix.