| 摘要 |
PROBLEM TO BE SOLVED: To enhance explosive power of an explosive composition without reducing its performance with respect to low-temperature initiation sensitivity and sympathetic detonation sensitivity and also without adversely affecting its aging stability by controlling the degrees of oxygen excess/shortage of emulsion base materials before and after the addition of a metallic heat-generating agent within their respective specified ranges. SOLUTION: This w/o type emulsion explosive composition comprises: a discontinuous phase consisting of ammonium nitrate, another oxidizing salt(s), water and an organic amine oxidizing salt(s); a continuous phase consisting of petroleum hydrocarbons and an emulsifier suitable for forming a w/o type emulsion; a specific-gravity adjusting agent; and 3-20 wt.% of a metallic heat-generating agent, wherein the explosive composition contains water (or water content) in a 5-20 wt.% ratio of the water to the whole explosive composition, and also, the degree of oxygen excess/shortage of an emulsion base material having a composition before the addition of the metallic heat-generating agent, is adjusted to -5.00 to +3.00 g/100 g and the degree of oxygen excess/shortage of another emulsion base material having a composition after the addition of the metallic heat-generating agent, is adjusted to -20.00 to -4.00 g/100 g, and further, as the metallic heat-generating agent, a powdery or flaky metallic heat-generating agent having a particle size distribution such that the weight ratio of the particle fraction passing through a sieve of the sieve designation 149μm specified in JIS or other equivalent standards) to the total weight of all the particles is >=90 wt.%, is preferred.
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