Self-remediating projectile

a self-remediation and projectile technology, applied in the field of ballistic projectiles, can solve the problems of significant pollution, large cost involved in the removal of this pollution, and inability to meet the requirements of the coating,

Inactive Publication Date: 2005-09-29
GEMINI STRATEGIES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017] A method of making a self-remediating projectile is also provided and comprises coating or otherwise treating a metal projectile with an organic solvent solution (or other mixture) of a binder polymer and a remediation agent; and drying the coated article. A technique such as ...

Problems solved by technology

When bullets or shot are fired on ranges they can, under adverse conditions, give rise to significant pollution through the solublisation and corrosion of the lead-antimony alloy in a concentrated area.
The costs involved in the removal of this pollution are substantial.
The principal problem with that approach is that, when the ammunition projectile is fired, the acts of firing, barrel abrasion, collision with other projectiles, and impact with the target or ground cause breaches in the coating.
Thus, such barriers impart no e...

Method used

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Examples

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example 1

[0044] A surface coating is prepared by forming a solution of (a) a linear copolymer polymer comprising poly[(methyl acrylate)x(tris-capped acrylic acid)y], where x:y is approximately 87:13 (100 parts by weight (pbw)), (b) ethyl acetate (100 pbw) and (c) propan-2-ol (100 pbw). This coating imparts moisture resistance to a coated metal article but, on immersion in water for more than a few hours, readily hydrates, crumbles and dissolves over a period of several days to weeks. Being a soluble acrylic polymer, it is intrinsically biodegradable.

[0045] The polymer solution is combined with a remediation agent known as Molecular Bonding System 3.1™ from Solucorp Industries: a 3:2:1 wt.-to-wt. mixture of technical grade calcium sulfide, calcium carbonate, and triple super phosphate) (200 pbw) and additional ethyl acetate (300 pbw) to form the IFS coating.

[0046] The IFS coating is applied to a US No. 8 lead—1.25% antimony alloy shot at a concentration of 1% by weight (dry weight) by a tum...

example 2

[0055] A surface coating is prepared by forming a dispersion of MBS 2.1™ (Solucorp Industries Ltd.) in polyvinyl acetate-polyvinyl alcohol, (PVAcx-PVAy, where the mole ratio x is >=65%). Specifically, a blend of 20% w / w / PVAc-PVA solution, MBS 2.1™, and ethyl acetate solvent are mixed together at the ratio 1:2:1 pbw. 10 gram of the resulting dispersion is applied to the underside of a normal commercial or biodegradable clay pigeon, such as those supplied by CCI International Ltd (of Priors Haw Road, Corby, Northants, UK). On drying, the weight of the standard sized clay pigeon should be within the weight range 100-110 grams and will carry 4-5 grams of an IFS reagent, which may be liberated by biodegradation and or weathering to release sufficient reagent to remediate approximately 2.0 to 2.5 grams of soluble lead or passivate the surface against corrosion of a much larger proportion metallic lead shot. The above dispersion may be modified into a sprayable paint or re-formulated into...

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PUM

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Abstract

The invention provides a self-remediating projectile, i.e., an environmentally-remediating bullet, slug, shot, missile, or other ballistic projectile. An environmental remediation agent (e.g., a calcium or magnesium sulfide, phosphate, or similar material), preferably in combination with a water-soluble or biodegradable polymer, acts as a coating for a conventional projectile, rendering it less water soluble and, hence, less prone to corrosion. Also provided are a method of making a self-remediating projectile, an environmentally remediating target, and a method of remediating an area polluted with spent ammunition.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) [0001] This application claims the benefit of U.S. Provisional Patent Application No. 60 / 525,253, filed Nov. 26, 2003, and U.S. Provisional Patent Application No. 60 / 540,291, filed Jan. 29, 2004. The entire contents of both applications are incorporated by reference herein.FIELD OF THE INVENTION [0002] This invention is directed to ballistic projectiles and their environmental remediation, and related products and materials. BACKGROUND OF THE INVENTION [0003] The solubility of lead in water (plumbo-solvicity) is a known phenomenon. Pure lead in soft water will yield concentrations of soluble lead levels of above 0.75 mg / litre at pH 7.5 within days to weeks. (FIG. 1.) Lead-antimony alloys will dissolve at a much faster rate and achieve much higher levels of soluble lead owing to Redox reactions of the lead and antimony present in the alloy. (FIG. 2.) [0004] Lead-antimony alloys are extensively used for ballistics applications such as bullets ...

Claims

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Application Information

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IPC IPC(8): F42B12/74F42B12/80F42B30/00F42B30/02
CPCF42B12/46F42B30/02F42B12/80F42B12/74
Inventor HURLEY, PETER J.
Owner GEMINI STRATEGIES
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