Articles and armor materials incorporating fiber-free compositions and methods of forming same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08J-005/00
B82Y-030/00
C08J-003/24
C08K-003/34
C08K-005/00
B29C-035/02
B29C-039/00
F41H-005/04
B29K-009/00
B29K-105/06
B29K-309/00
B29L-031/00
출원번호
US-0599395
(2015-01-16)
등록번호
US-9850353
(2017-12-26)
발명자
/ 주소
Gajiwala, Himansu M.
Ellertson, John W.
출원인 / 주소
Orbital ATK, Inc.
대리인 / 주소
TraskBritt
인용정보
피인용 횟수 :
0인용 특허 :
82
초록▼
Materials including support layers and fiber-free compositions are disclosed, as well as related articles and methods for making the materials. The fiber-free compositions are formed from a precursor composition that includes a nitrile butadiene rubber, a nanoclay and a cure package including a sulf
Materials including support layers and fiber-free compositions are disclosed, as well as related articles and methods for making the materials. The fiber-free compositions are formed from a precursor composition that includes a nitrile butadiene rubber, a nanoclay and a cure package including a sulfur-based curing agent. The fiber-free compositions may have a substantially reduced weight and compressive modulus in comparison to conventional rubber. Thus, the fiber-free compositions may provide improved ballistic properties in addition to reduced density and thickness. Precursor compositions for forming the insulative composition may have good flow characteristics. The fiber-free compositions may be used in a variety of applications, such as personnel body armor, ground vehicle armor and aircraft armor systems.
대표청구항▼
1. An article, comprising: at least one layer of a support; andan uncured fiber-free composition in contact with the at least one layer of the support, the uncured fiber-free composition comprising:at least one nitrile butadiene rubber comprising between about 50% by weight and about 80% by weight o
1. An article, comprising: at least one layer of a support; andan uncured fiber-free composition in contact with the at least one layer of the support, the uncured fiber-free composition comprising:at least one nitrile butadiene rubber comprising between about 50% by weight and about 80% by weight of a total weight of the uncured fiber-free composition;a nanoclay homogeneously dispersed within the uncured fiber-free composition; anda sulfur-based curing agent,wherein the uncured fiber-free composition comprises an isotropic material. 2. The article of claim 1, wherein the at least one nitrile butadiene rubber comprises between about 60% by weight and about 70% by weight of the total weight of the uncured fiber-free composition. 3. The article of claim 1, wherein the nanoclay comprises a montmorillonite clay. 4. The article of claim 1, wherein the uncured fiber-free composition further comprises a cure accelerator. 5. The article of claim 4, wherein the cure accelerator comprises at least one material selected from the group consisting of tetramethyl thiuram disulfide and benzothiazyl disulfide. 6. The article of claim 1, wherein the nanoclay comprises between about 8% by weight and about 12% by weight of the total weight of the uncured fiber-free composition. 7. The article of claim 1, wherein the uncured fiber-free composition further comprises at least one of an antioxidant, a tackifier, a processing aid, a plasticizer, and an activator. 8. The article of claim 1, wherein the uncured fiber-free composition further comprises at least one of an amine antioxidant, a phenolic resin, stearic acid, dioctyl phthalate, and zinc oxide. 9. The article of claim 1, wherein the nanoclay comprises magnesium aluminum silicate platelets modified with a quaternary ammonium salt. 10. The article of claim 1, wherein the at least one layer of a support comprises at least two layers of the support separated by the uncured fiber-free composition. 11. The article of claim 1, wherein the uncured fiber-free composition comprises a first portion and a second portion, wherein the first portion is disposed on a first side of the at least one layer of the support, and wherein the second portion is disposed on a second opposite side of the at least one layer of the support. 12. An armor material, comprising: layers of a support material; anda fiber-free composition between adjacent layers of the support material, the fiber-free composition comprising:at least one nitrile butadiene rubber comprising between about 50% by weight and about 80% by weight of a total weight of the fiber-free composition;a nanoclay homogeneously dispersed within the fiber-free composition; anda sulfur-based curative,wherein the fiber-free composition comprises an isotropic material. 13. The armor material of claim 12, wherein the fiber-free composition further comprises at least one of tetramethyl thiuram disulfide and benzothiazyl disulfide. 14. The armor material of claim 12, wherein the support material comprises a fibrous material. 15. A method of forming an armor material, comprising: exfoliating a nanoclay with a polymer comprising at least one nitrile butadiene rubber to form a homogeneous mixture of the nanoclay and the polymer;combining the homogeneous mixture with a sulfur-based curative to form a fiber-free composition; composition;disposing the fiber-free composition adjacent layers of a support material; andcuring the fiber-free composition to form a cured fiber-free composition comprising the at least one nitrile butadiene rubber, the nanoclay homogeneously dispersed within the cured fiber-free composition, and the sulfur-based curative, wherein the fiber-free composition comprises an isotropic material, and wherein the at least one nitrile butadiene rubber comprises between about 50% by weight and about 80% by weight of a total weight of the cured fiber-free composition. 16. The method of claim 15, wherein exfoliating a nanoclay with a polymer comprising at least one nitrile butadiene rubber to form a homogeneous mixture of the nanoclay and the polymer comprises mixing the at least one nitrile butadiene rubber with the nanoclay for a time period between about 5 minutes and about 25 minutes to form the homogeneous mixture. 17. The method of claim 15, wherein exfoliating a nanoclay with a polymer comprising at least one nitrile butadiene rubber to form a homogeneous mixture of the nanoclay and the polymer further comprises mixing an amine antioxidant and a phenolic resin with the homogeneous mixture. 18. The method of claim 15, wherein combining the homogeneous mixture with a sulfur-based curative to form a fiber-free composition comprises mixing a first portion of the homogeneous mixture with the curative to form a premix and mixing a second remaining portion of the homogeneous mixture with the premix to form the fiber-free composition. 19. The method of claim 18, wherein mixing a first portion of the homogeneous mixture with the curative to form a premix comprises mixing about one-half of a total volume of the homogeneous mixture with the curative to form the premix. 20. The method of claim 15, wherein combining the homogeneous mixture with a sulfur-based curative to form a fiber-free composition comprises mixing the homogeneous mixture with laccofine sulfur and at least one of tetramethyl thiuram disulfide and benzothiazyl disulfide to form the fiber-free composition. 21. The method of claim 15, further comprising adding at least one material selected from the group consisting of a tackifier, an activator, and a plasticizer to the homogeneous mixture before combining the homogeneous mixture with the curative. 22. The method of claim 15, wherein combining the homogeneous mixture with a sulfur-based curative to form a fiber-free composition comprises forming a fiber-free composition having a Mooney viscosity of less than about 30 at a temperature of 100° C.
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