Water resistant sensitizing additive for ammonium nitrate blasti

Details Water resistant sensitizing additive for ammonium nitrate blasti Water resistant sensitizing additive for ammonium nitrate blasti

1986-10-06

1988-10-25

Lechert, Jr., Stephen J.

Explosive and thermic compositions or charges

Structure or arrangement of component or product

Particles of diverse size or shape

149 2, 149 41, 149 61, 149 72, C06B 4502

Patent

active

047801565

ABSTRACT:
A dry non-explosive additive for ammonium nitrate-fuel oil (ANFO) blasting agents which provides water resistance and wet sensitivity to allow use of the explosive in wet drill holes. The additive contains gelling agents that rapidly hydrate and swell upon water impingement, and thereafter cross-link to rapidly form a peripheral water-blocking barrier to prevent further water intrusion into a loaded blasting agent mass. The additive additionally contains hydrophobic sensitizers and optional fuels to provide points of adiabatic compression and physically hinder water incursion. When the additive is mixed with ANFO, the resulting blasting agent retains its dry and free pouring characteristics and has enhanced explosive properties over untreated ANFO. While ANFO may not detonate in wet conditions unless protected from water, when admixed with our additive it retains its explosive characteristics and detonation potential after placement in wet environs, to function well either wet or dry.

REFERENCES:
patent: 3465675 (1969-09-01), Bronstein, Jr.
patent: 3540953 (1970-11-01), Schultze
patent: 4039361 (1977-08-01), Ray et al.
patent: 4128442 (1978-12-01), Barlow
patent: 4198253 (1980-04-01), Kirchnerova et al.
patent: 4207125 (1980-06-01), Grant
patent: 4637849 (1987-01-01), Harris

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