Liners for flares and related methods

Patent metadata

Field	Value
Publication number	US-11073366-B2
Application number	US-201916726559-A
Country	US
Kind code	B2
Filing date	Dec 24, 2019
Priority date	Dec 24, 2019
Publication date	Jul 27, 2021
Grant date	Jul 27, 2021

Abstract

A flare comprising an illuminant adjacent to a casing of a flare and a liner between the casing and the illuminant. The liner comprises a reaction product of a prepolymer and a curative, and one or more of a zinc oxide material or an aluminum oxide material. Methods of forming a flare are also disclosed.

First claim

What is claimed is:

1. A flare comprising:
an illuminant adjacent to a casing of a flare; and
a liner between the casing and the illuminant, the liner comprising:
a reaction product of a prepolymer and a curative; and
one or more of a zinc oxide material or an aluminum oxide material.

2. The flare of claim 1 , wherein the zinc oxide material comprises zinc borate.

3. The flare of claim 1 , wherein the aluminum oxide material comprises aluminum trihydroxide.

4. The flare of claim 1 , wherein the liner comprises zinc borate and aluminum trihydroxide in the reaction product of the prepolymer and the curative.

5. The flare of claim 1 , wherein the prepolymer comprises a hydroxyl-terminated polybutadiene (HTPB), a hydroxyl-terminated polyether (HTPE), a hydroxyl-terminated polypropylene glycol, a hydroxyl terminated polyester, a carboxyl-terminated polybutadiene (CTPB), a carboxyl-terminated polyester, a carboxyl terminated polybutadiene-acrylonitrile (CTBN), ethylene propylene diene monomer (EPDM), acrylonitrile butadiene rubber (NBR), or a combination thereof.

6. The flare of claim 1 , wherein the liner is substantially free of carbon black.

7. The flare of claim 1 , wherein the liner is substantially free of fibers.

8. The flare of claim 1 , wherein the illuminant is formulated to produce electromagnetic radiation at wavelengths in one or more of the visible region of the electromagnetic radiation spectrum or the infrared region of the electromagnetic radiation spectrum.

9. The flare of claim 1 , wherein the reaction product comprises a polymer matrix, and zinc borate and aluminum trihydroxide are dispersed in the polymer matrix.

10. The flare of claim 1 , wherein the liner directly contacts the illuminant.

11. The flare of claim 1 , wherein the liner directly contacts the casing.

12. A method of forming a flare, comprising:
forming a precursor liner composition comprising a prepolymer, one or more of a zinc oxide material or an aluminum oxide material, and a curative;
applying the precursor liner composition to a casing or to an illuminant of a flare; and
curing the precursor liner composition to form a liner on the casing or on the illuminant.

13. The method of claim 12 , wherein forming a precursor liner composition comprises combining the prepolymer, one or more of zinc borate or aluminum trihydroxide, and the curative.

14. The method of claim 12 , further comprising combining one or more of titanium dioxide, silicon dioxide, or microspheres with the prepolymer, the one or more of zinc borate or aluminum trihydroxide, and the curative.

15. A method of forming a flare, comprising:
forming a precursor liner composition comprising a prepolymer, one or more of zinc borate or aluminum trihydroxide, and a curative;
curing the precursor liner composition to form a liner; and
applying the liner to at least a portion of a casing or to at least a portion of an illuminant of a flare.

16. The method of claim 15 , wherein forming a precursor liner composition comprises combining a hydroxyl-terminated polybutadiene (HTPB), the one or more of zinc borate or aluminum trihydroxide, and the curative.

17. The method of claim 15 , wherein forming a precursor liner composition comprises combining ethylene propylene diene monomer (EPDM), the one or more of zinc borate or aluminum trihydroxide, and the curative.

18. The method of claim 15 , wherein curing the precursor liner composition to form a liner comprises dispersing the one or more of a zinc oxide material or an aluminum oxide material in a reaction product of the prepolymer and the curative.

19. The method of claim 15 , wherein applying the liner to at least a portion of a casing or to at least a portion of an illuminant comprises applying the liner to an inner surface of the casing.

20. The method of claim 15 , wherein applying the liner to at least a portion of a casing or to at least a portion of an illuminant comprises applying the liner to an outer surface of the illuminant.

Assignees

• Northrop Grumman Systems Corp

Inventors

• Larson Robert S
• Bonderson Elizabeth K

Classifications

• F42B4/26 Primary

  Flares; Torches {(mines for practice or training containing flares or illuminating charges F42B8/28; projectiles of illuminating type F42B12/42)} · CPC title