| 摘要 |
A stable non-separating explosive gel contains as essential ingredients 25-60% by weight of ammonium nitrate; 5 to 25% by weight of an alkali metal nitrate; 15 to 50% by weight of a sensitizer explosive; 5 to 25% by weight of water; 0'1 to 5% by weight of a polyacrylamide having an apparent molecular weight from one million to 25 million, and a hydrolysed free acid content of 0.1 to 8%; and from 0.01 to 0.05% by weight of a polyvalent metal inorganic salt cross-linking agent for said polyacrylamide. Preferred constituent ranges inside the above broad ranges are given in the Specification, and the weight ratio of polyacrylamide to the cross-linking agent is preferably from 8:1 to 12:1 whilst the weight ratio of ammonium nitrate to sensitizer is from 2.5:1 to 4:1. The cross-linking agent is preferably a water soluble salt of an inorganic acid and aluminium, iron chromium or tin, e.g. aluminium sulphate. The sensitizing explosives specified are smokeless powder, TNT or other nitrated equivalents, and cyclonite used in composite sensitizers with TNT, and it is indicated that the particle size of the sensitizer influences the amount used, and that as a rule less TNT will be required than smokeless powder for similar types of composition. There is no critical order in which the constituents should be combined except for the cross-linking agent. This should be added last. Specification 825,367 and U.S.A. Specification 2,930,685 are referred to.
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