KR101478643B1 - Pyrotechnic smoke material for obscruing multi-spectrum using expanded graphite and red phosphorus - Google Patents

Abstract

The present invention relates to a combustion type multi-region screening smoke agent for smoke screen and deception, and more specifically, to a combustion type multi-region screening smoke agent which has impermeability in visible ray and ultraviolet ray band by combustion reaction materials of red phosphorus in the combustion, and provides a camouflage smokescreen which causes scattering absorption in millimeter wave band as expanded graphite is expanded, by comprising 30-50 wt% of red phosphorus, 20-40 wt% of expanded graphite, and 5-15 wt% of an alkali metal nitrate; 2-20 wt% of a composition selected from a group consisting of at least one type of metal selected from a group consisting of alkali earth metals and transition metals, alloy thereof, and at least one metalloid, and 0.5-8 wt% of a bonding agent.

Description

TECHNICAL FIELD [0001] The present invention relates to a soft multi-zone coating film using expanded graphite and red phosphor,

TECHNICAL FIELD The present invention relates to a soft multi-zone multi-layer smoke film composition, and more particularly, to a soft multi-zone multi-layer smoke film composition which provides a smoke film that is impermeable in visible light, infrared light and millimeter wave spectrum .

In the case of soft smoke films, it has been used mainly in the military field for camouflage, deception, simulation, and position indication in the field environment.

However, due to the development of electro-optic equipment and various sensors due to the recent development of military technology, high-performance main and night observation equipment and guided weapons have appeared, so that the conventional visible ray screening smoke- I can not guarantee sex. Particularly, the detection sensors are classified into an infrared sensor that uses the characteristic of emitting a heat ray inherent to an object, which is capable of detecting the target even at a long distance according to the emission energy change of the military target, and the infrared sensor which obstructs the hot wire of the target due to fog, Is developed as a millimeter wave sensor that overcomes the difficult vulnerability and is applied to various weapon systems.

In order to cope with the infrared sensor among these detection sensors, in the case of the conventional small-sized on-board smoke film material, in the visible light band and the high infrared band (3 to 5 μm) and the far infrared band (8 to 14 μm) Which is suitable for generation of a smoke film having a radiant energy of < RTI ID = 0.0 > However, in the case of such a small-sized on-vehicle smoke film based on red phosphorus, visible light and infrared light band can be effectively provided, but there is no deck effect on the millimeter wave band.

On the other hand, in order to develop a detection sensor of a millimeter-wave band, in the case of a conventional dispersion type smoke film, a glass fiber coated with a metal or a powder made of carbon fiber is transported to a target place using a rocket or an airplane, . However, in the case of such a dispersing type of film forming agent, there is a problem that there is a limitation in the application of the system because of the short sedimentation time of the film forming agent due to rapid settling of the metal film powder and adoption of the spraying method.

Accordingly, there is a demand for the development of a film forming agent which can effectively and for a long time be prepared for light of a millimeter wave (35 GHz, 94 GHz) band as well as a visible light and an infrared ray band.

Patent Document 1: Korean Patent Laid-Open Publication No. 2013-0094090

In order to solve the above problems, the present invention is to provide a highly radioactive aerosol that is impermeable to visible light and ultraviolet light, and furthermore, a parabolic technique that provides a float that causes absorption and scattering even in the millimeter wave spectrum The present invention provides a zigzag smoke film composition.

In order to accomplish the above object, the present invention provides a soft multi-zone in-line softener for a smoke screening apparatus and a deceptive purpose, which comprises 30 to 50% lighter, 20 to 40% expanded graphite, 5 to 15 % Of an alkali metal nitrate, and as a secondary component, from 2 to 20% of a composition selected from the group consisting of at least one metal selected from the group consisting of alkaline earth metals and transition metals, an alloy thereof and at least one metalloid, To 8% of binder, which is impermeable in the visible and ultraviolet bands due to the combustion reaction material of the fuel during burning of the soft multi-zone in-line softener, and the expanded graphite expands to absorb in the millimeter wave band Thereby providing a camouflage film for spawning which causes scattering.

Preferably, the soft multi-zone coating film according to the present invention comprises 40 to 45% of expanded graphite, 30 to 40% of expanded graphite, 6 to 10% of alkali metal nitrate, 8% of transition metal and metalloid, and 3 to 5% of nitrocellulose as a binder.

Preferably, the soft multi-zone in-line softening agent according to the present invention is characterized by forming graphite expanded to a predetermined size with the radioactive aerosol during the combustion reaction.

Preferably, the particle diameter of the aerosol produced during combustion is 0.3 to 14 占 퐉.

Preferably, the composition of the present invention is at least one selected from the group consisting of magnesium, aluminum, titanium, zirconium, magnesium alloy, and aluminum alloy.

The soft multi-zone multi-layer smoke film according to the present invention is capable of performing effective smoke screening not only in the visible light and infrared spectrum but also in the wavelength range of the millimeter wave band, Can be increased.

Also, according to the present invention, the soft multi-zone in-line smoke film can sustain a smoke film capable of providing a millimeter wave band for a long time, thereby enhancing the viability of the friendly soldier and improving the system applicability at the time of the operation.

In addition, the raw materials such as expanded graphite, rheology, metal, and oxidizing agent constituting the soft multi-zone in-line softener according to the present invention are all raw materials proven to be non-cancerous in humans, and smoke smoke products are also human non-cancerous, It is possible to produce an environmentally friendly smoke film.

Hereinafter, the present invention will be described in detail with reference to specific examples.

The soft multi-zone in-line smoke film according to the present invention is produced by combining a red and an expanded graphite. The visible light and the infrared band conductor are combined with the combustion reaction material. The millimeter wave band is formed by the expanded graphite, And to effectively develop the millimeter wave band as well as the infrared band.

The soft multi-zone in-line softener according to the present invention comprises 30 to 50% of lean and 20 to 40% of expanded graphite (Graphite Hydrogen Sulfate, graphite fluoride) as a main component, and the alkali metal nitrate is 5 To 15%. Further, as the secondary component, the metallic or non-metallic fuel includes 2 to 20% of at least one composition selected from the group consisting of a metal selected from the group of alkaline earth metals and transition metals, an alloy thereof, and at least one metalloid 0.5 to 8% binder.

As the oxidizing agent, an alkali metal nitrate selected from the group consisting of potassium nitrate, potassium perchlorate and cesium nitrate is preferable. Among the secondary components, the metallic or non-metallic fuel is preferably a composition comprising at least one metal selected from the group consisting of magnesium, aluminum, titanium, zirconium, magnesium alloy, and aluminum alloy. As the binder, a polymer organic binder is preferably used, and nitrocellulose or polychloroprene is preferably used.

The soft multi-zone coating film according to the present invention comprises 40 to 45% of expanded graphite, 30 to 40% expanded graphite, 6 to 10% of alkali metal nitrate as a secondary component, 5 to 8% Metal and metalloid, and 3 to 5% nitrocellulose as a binder.

In the case of the particle size of the aerosol generated during combustion of the smoke film composition, it should coincide with the wavelength of the beam to be scattered. That is, in the case of aerosols generated during combustion, the diameter should be 0.3 to 14 μm for the visible light band and 0.8 to 14 μm for the infrared band. Therefore, in order to effectively conduct the visible ray band and the infrared ray band, the particle size of the aerosol generated at the time of combustion of the composition of the present invention is 0.8 to 14 탆, and in order to construct a millimeter wave, Mu m.

The soft multi-domain smoke film according to the present invention does not transmit by absorption and scattering by the aerosol formed in the combustion in the visible light band, but absorbs and scatter infrared rays in the infrared (3 to 5 탆, 8 to 14 탆) In addition, aerosols that emit excess infrared radiation energy are generated at the same time as smoke film burning reaction, thereby reducing the transmittance of infrared rays. In addition, millimeter wave (35 GHz, 94MHz).

In addition, unlike the dispersing type smoke film which emits powder capable of attracting millimeter waves, the combustion products generated during the combustion of the smoke film composition composed of the above composition partially diffuse the generation of the aerosol droplets and the expanded graphite suspended material, Since it is continuously generated during the reaction process, it is possible to keep the smoke film capable of generating visible light, infrared light, and millimeter wave band for a long period of time required for the conductor.

The crystals of expanded graphite contained in the smoke film composition according to the present invention have an anisotropic layered structure and the carbon atoms in the graphite layer surface are tightly bonded by covalent bonds, Der Waals. Therefore, in the case of an oxidizing agent having a strong electron affinity, the electrons exposed in the graphite layer are attacked while the carbon atom in the plane is 1.41 A and the interplanar distance is 3.35 A, It easily enters between graphite layers and does not destroy the two-dimensional network lattice, but forms interlayer compounds peculiar to graphite while widening the layer interval.

At this time, when the molecular paper inserted into the interstices, the microwaves, or the smoke composition are heated at the same time by the combustion, the expansion of tens to hundreds of times occurs due to the ejection pressure. The thus-obtained suspended product has an excellent resonance effect with respect to the corresponding millimeter wave at a half-wavelength size of a specific frequency, and can cause a damping effect which interferes with the progress of the millimeter wave. Therefore, it is possible to provide effective guidance for not only visible and infrared bands but also millimeter wave spectral bands.

Example

A paste-like arrangement is prepared by gradually adding the respective components to the red phosphorus from 3300 g of expanded graphite, 2750 g of red iron, 750 g of potassium nitrate, 150 g of magnesium, 220 g of boron, 220 g of zirconium and 300 g of a polymer compound binder. Moisten the material with solvent to a mesh width of 7 mm and dry in vacuum at 40 ° C and 20 mbar for 20 minutes. 42 g of the dried grain was press-molded into a ring-shaped press-formed body having a height of 10 mm, an outer diameter of 57 mm and an inner diameter of 15 mm at a pressure of 20 tons to form a pellet.

One pellet produced in this way generates a large amount of thick white smoke and expanded graphite suspended in the visible light spectrum with a burning time of about 15 seconds. The intensity of visible light, infrared light and millimeter wave in each spectral range was changed using visible light, infrared light, radio meter and radar (35 GHz, 94 GHz) generated at a position 5 m away from the smoke source, The light attenuation was confirmed as shown in Table 1 below.

Visible light band
(0.4 to 2 탆) Infrared band
(3 to 14 탆) Millimeter wave band
(35 GHz) Millimeter wave band
(94 FHz) -αC value of 0.45 or more
- Smoke duration:
More than 50 seconds -αC value of 0.45 or more
- Smoke duration:
20 seconds or more -dB value 3 or higher
- Smoke duration:
20 seconds or more -dB value 3 or higher
- Smoke duration:
More than 50 seconds

Where α is the sum of the scattering coefficient and the absorption coefficient of a given material and is the mass attenuation index dependent on the wavelength of the aerosol particles and C is the aerosol concentration per unit volume of the film. The? C value is used in the Lambert-Beer's law of light scattering and absorption shown in the following formula (1) to show the degree of attenuation of visible light and infrared light.

[Equation 1]

I = I ₀ exp ^{- aCL} (1)

(I _o : initial strength, I: intensity attenuated by smoke film, length of L smoke cloud)

dB is a value determined by the following equation (2), which represents the degree of attenuation of the millimeter wave attenuated by the smoke film.

&Quot; (2) "

dB = 1-log P ₁ / P ₀ (2)

(P ₀ : initial input signal intensity, P ₁ : signal intensity attenuated by smoke)

As can be seen from the above Table 1, according to the smoke type multi-zone coating composition according to the present invention, the smoke is maintained for at least 20 seconds, and excellent visible light, ultraviolet and millimeter wave damping effects exist.

Claims (5)

In a soft multi-zone overlay film for a smoothing conductor and a deception purpose,
The composition of claim 1, further comprising 40-45% of lean, 30-40% expanded graphite, 6-10% of alkali metal nitrate, 5-8% of secondary component and 3-5%
Wherein the secondary component is composed of a transition metal and metalloid,
The binder is nitrocellulose,
Wherein the combustion smoke material is impermeable in the visible and ultraviolet bands due to the combustion reaction material of the flame at the time of burning the soft multi-zone in-line smoke film and causes the expansion graphite to swell and absorb scattering in the millimeter wave band Wherein the soft polytetrafluoroethylene is provided with a soft polytetrafluoroethylene film. delete The method according to claim 1,
Wherein the soft multi-zone in-line softening film forms graphite expanded to a predetermined size with a radioactive aerosol during a combustion reaction. The method of claim 3,
Wherein the particle diameter of the aerosol is 0.3 to 14 mu m. delete