Explosive

Abstract

A water-in-oil emulsion explosive characterized by containing an ethylene vinyl acetate copolymer. It has excellent long-term stability. Even when stored under a load for as long as about one year, the explosive is less apt to suffer a decrease in explosive performance and coagulates only slightly in such a degree that it comes to have weakly coherent partial coagulates which can be easily disaggregated. Even after long-term storage, charging with the explosive can be easily conducted with a charger. Since the explosive has excellent water resistance, it is suitable also for blasting in a water hole.

1 . A water-in-oil emulsion type explosive characterized by having a continuous phase comprising ethylene vinyl acetate copolymers.  
     
     
         2 . The water-in-oil emulsion type explosive according to  claim 1 , characterized by comprising ethylene vinyl acetate copolymers from 0.2 to 8% by mass of total amount of the explosive.  
     
     
         3 . The water-in-oil type emulsion explosive characterized by comprising oxidizers, oily materials, ethylene vinyl acetate copolymers, emulsifiers and hollow micro spheres.  
     
     
         4 . The emulsion explosive according to  claim 3 , wherein hollow microspheres are glass microbaloons or resin micorbaloons.  
     
     
         5 . The emulsion explosive according to  claim 3 , wherein comprising 30% by mass or more of ethylene vinyl acetate copolymers to the total mass of oily materials and ethylene vinyl acetate copolymers.  
     
     
         6 . The emulsion explosive according to  claim 3 , wherein the melt-flow rate of ethylene vinyl acetate copolymers is 10 g/10 min. or more.  
     
     
         7 . The emulsion explosive according to  claim 3 , wherein a number average molecular weight of ethylene vinyl acetate copolymers is 100 to 50,000 Mn.  
     
     
         8 . The emulsion explosive according to any one of  claims 1  to  7 , wherein the emulsion explosive is characterized as solid.  
     
     
         9 . The explosive according to  claim 8 , formed into a columnar shape of from 3 to 20 mm in diameter and from 1 to 30 mm in length.