An emulsion matrix was mixed with 0%

2%

4%

6% and 8% by the mass of KCl separately

and then expanded perlite and chemical foaming agent as sensitizing agent were used separately to make two groups of emulsion explosives. Their explosion shock waves were tested in water before and after compression by shock waves produced by the host charge underwater. The pressure desensitization degrees of these emulsion explosives were calculated with the peak pressure values of tested shock waves and compared

and the influence of KCl content was analyzed. Results show that when KCl content is between 0% and 2%

the pressure desensitization degrees of the emulsion explosives are unchanged; when KCl content is between 2% and 8%

KCl content shows strong influence

desensitization degree increases with the KCl content. It means that the anti-pressing performance of explosives is worse with the increase of KCl content

the change of the quality and crystallization point of dispersed phase is a factor to change the pressure desensitization degree. These results can provide reference for coal mine blasting and further study on mechanism of pressure desensitization.