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A kind of flexible vanadium dioxide sheet for infrared stealth and preparation method thereof

The technology of vanadium dioxide and vanadium dioxide nanometer is applied in the field of flexible vanadium dioxide thin film for infrared stealth and its preparation, which can solve the problems of poor solubility, difficulty in large-area application and high cost, and achieves simple operation process and easy mass production. , the effect of saving energy

Active Publication Date: 2021-02-23
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, vanadium dioxide is used in infrared stealth mainly through three forms of film, sheet and coating. The film preparation process is complicated, the cost is high, and it is difficult to apply in a large area; the sheet is rigid and difficult to apply to special-shaped parts. And it is mainly suitable for smaller devices and small-scale production; in the coating preparation process, the configuration of the coating is first required, and the infrared stealth coating needs to use an infrared transparent adhesive. EPDM rubber is well-known for its better infrared transparency. Adhesives, however, are poorly soluble in solvents, making them difficult to use
CN105669194A Chinese patent document discloses a method for preparing vanadium dioxide flakes with thermally variable infrared emissivity. In this method, the powder is first pressed into thin flakes, and then annealed to obtain vanadium dioxide flakes with thermally variable infrared emissivity. Its preparation process is simple, and in actual use, it can be processed into sheets of different sizes and directly pasted on the required parts. Production

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  • A kind of flexible vanadium dioxide sheet for infrared stealth and preparation method thereof
  • A kind of flexible vanadium dioxide sheet for infrared stealth and preparation method thereof
  • A kind of flexible vanadium dioxide sheet for infrared stealth and preparation method thereof

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Embodiment 1

[0036] A flexible vanadium dioxide sheet for infrared stealth, comprising the following components by weight: EPDM rubber (Dow Chemical 4820P): 89%; pure monoclinic vanadium dioxide nanopowder: 10%; Oxidant catechol: 1%; Among them, EPDM rubber (Dow Chemical 4820P) is obtained by copolymerization of ethylene, propylene and non-conjugated diene monomers, and the mass content of ethylene monomers is 75-85% , the mass content of propylene monomer is 8-12%; the particle size of monoclinic phase vanadium dioxide nanometer powder is 30-100nm, and its phase transition temperature is 67°C.

[0037] The preparation method of the flexible vanadium dioxide sheet for infrared cloaking of the present embodiment comprises the following steps:

[0038] (1) Put EPDM rubber (Dow Chemical 4820P), monoclinic vanadium dioxide nanopowder and catechol into high-speed mixing according to the weight content of 89%, 10% and 1% respectively In the machine, stir in a high-speed mixer for 30 minutes, an...

Embodiment 2

[0043]A flexible vanadium dioxide sheet for infrared stealth, comprising the following components by weight: EPDM rubber (Dow Chemical 4820P): 89%; tungsten-doped monoclinic vanadium dioxide nanopowder: 10%; And antioxidant catechol: 1%; Among them, EPDM rubber (Dow Chemical 4820P) is obtained by copolymerization of ethylene, propylene and non-conjugated diene monomer, and the content of ethylene monomer is 75-85% %, the content of propylene monomer is 8-12%; the particle size of tungsten-doped monoclinic vanadium dioxide nanometer powder is 40-110nm, and its phase transition temperature is 55°C.

[0044] The preparation method of the flexible vanadium dioxide sheet for infrared cloaking of the present embodiment comprises the following steps:

[0045] (1) Put EPDM rubber (Dow Chemical 4820P), tungsten-doped monoclinic vanadium dioxide nanopowder and catechol according to the weight content of 89%, 10% and 1% respectively Put it into the high-speed mixer, stir in the high-spe...

Embodiment 3

[0050] A flexible vanadium dioxide sheet for infrared stealth, comprising the following components by weight: EPDM rubber (Dow Chemical 4820P): 99%; tungsten-doped monoclinic vanadium dioxide nanopowder: 0.9%; And antioxidant catechol: 0.1%; Among them, EPDM rubber (Dow Chemical 4820P) is obtained by copolymerization of ethylene, propylene and non-conjugated diene monomers, and the mass content of ethylene monomers is 75 ~ 85%, the mass content of propylene monomer is 8-12%; the particle size of tungsten-doped monoclinic vanadium dioxide nanometer powder is 40-110nm, and its phase transition temperature is 35°C.

[0051] The preparation method of the flexible vanadium dioxide sheet for infrared cloaking of the present embodiment comprises the following steps:

[0052] (1) Put EPDM rubber (Dow Chemical 4820P), tungsten-doped monoclinic vanadium dioxide nanopowder and catechol according to the weight content of 99%, 0.9% and 0.1% respectively Put it into the high-speed mixer, s...

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Abstract

The invention discloses a flexible vanadium dioxide flake for infrared stealth. The flexible vanadium dioxide flake comprises the following components in percentage by weight: 89-99% of ethylene-propylene-diene monomer, 0.9-10% of vanadium dioxide nano powder and 0.1-1% of an antioxidant. The preparation method disclosed by the invention comprises the following steps: (1) uniformly mixing the ethylene-propylene-diene monomer, vanadium dioxide nano powder and the antioxidant by a mixing machine; and (2) adding the mixture obtained in the step (1) into a micro screw extruder to be continuously extruded, molding the extruded rubber in a micro injection molding machine, thereby completing preparation of the vanadium dioxide flake. The vanadium dioxide flake disclosed by the invention is excellent in flexibility and is applicable to the surfaces of various special-shaped devices. The flexible vanadium dioxide flake is prepared in an extrusion molding manner, and is simple in operation process, easy to mold, low in cost and capable of being easily produced in batches. Moreover, high-temperature annealing is not needed, and energy can be saved.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a flexible vanadium dioxide film for infrared stealth and a preparation method thereof. Background technique [0002] With the development of modern military technology, modern detection and guidance weapons are widely used in armed equipment, which increases the hit rate of weapons and equipment by 1 to 2 orders of magnitude, which undoubtedly poses a great threat to the survival of tanks, armor and other weapons. Modern military technology has reached the level that "as long as the target is found, it can be hit, and as long as it is hit, it can be destroyed". Therefore, in order to improve the survivability and penetration capabilities of weapons and equipment, various stealth technologies have attracted great attention from all countries in the world. Infrared stealth technology is mainly realized in two ways, one is to realize infrared stealth by di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/16C08K3/22
CPCC08K3/22C08K2201/003C08K2201/011C08L23/16
Inventor 刘东青嵇海宁程海峰张朝阳张松鹤
Owner NAT UNIV OF DEFENSE TECH