JPS5844695B2 - Pigment composition for camouflage cloth, camouflage sheet and camouflage paint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pigment composition for camouflage cloth or camouflage sheet.

Since ancient times, military bases, military equipment, etc. have been painted with camouflage to create the illusion that they are objects in the environment as a form of field camouflage.

For example, camouflage in the Arctic Circle is based on white, dark lines, yellow, etc. are used to hide certain objects in forested environments, and dark brown is used in areas that are mainly made of soil. Common camouflage colors include eggplant.

In recent years, the technology for creating such camouflage has advanced considerably, but on the other hand, the technology for detecting such camouflage objects has also advanced considerably, and with the development of remote sensitive computers, even though conventional camouflage can easily be seen. I'm starting to get used to it.

For example, in order to hide objects used for military purposes in traditionally green forest areas, woven cloth, plastic sheets, etc. are colored dark green with dyes and pigments, and objects are covered with the colored cloth or sheet as camouflage material. When looking at this kind of camouflage material with the naked eye, it is almost impossible to distinguish it from a forest area, but it is made of colored cloth or sheet that has been colored to the same tone as the green leaves using green leaves and copper phthalocyanine pigments. When we measured and compared the spectral reflectance, we found that the spectral reflectance curve A of the green leaf and the spectral reflectance curve B of the colored film made of copper phthalocyanine blue and yellow lead were 70%.
Because the reflectance at wavelengths beyond 0 nm differs greatly, 7
Camouflage objects can be easily identified by observing and recording with a measuring device that can detect infrared reflectance characteristics in the vicinity of 00 nm to 800 nm.

Therefore, there is a strong need for camouflage materials that have infrared reflective properties in addition to visual properties.

The present inventors have conducted various research on camouflage colorants that are effective in hiding objects from infrared remote sensing and infrared detectors, especially in forested environments. As a result of measuring the spectral reflectance of a plastic sheet colored dark green using an inorganic fired pigment, the present invention was achieved by finding that a curve almost similar to the spectral reflectance of green leaves of plants was obtained. .

That is, the present invention provides a camouflage cloth or camouflage sheet and a pigment composition for camouflage paint, which are characterized by containing green and blue inorganic fired pigments alone or together with yellow pigments as coloring components.

The green and blue inorganic fired pigments used in the present invention are inorganic pigments made of oxides of elements such as cobalt, aluminum, chromium, nickel, and zinc, such as CoO:
Al2O3:Cr203(20~25%:15%260
~65%) green pigment, CoO:A6203 (45%:5
5%) blue pigment and Tie.

: Cod: NiO: ZnO (35%=15%:35
%) green pigment, Coo' Al103: Mg0(
(44.9%: 55%: 0.1%) Blue pigments or yellow pigments used in combination with the inorganic fired pigments include, for example, azo pigments, isoindolinone pigments, yellow lead, molybdenum orange, and cadmium diro. and yellow titanium.

In the present invention, the cloth or sheet material of the camouflage cloth or camouflage sheet that is the base material to which camouflage is applied with the pigment composition includes, for example, polyamide-based, polyester-based, acrylic-based, acetate-based, polyvinyl chloride-based, polypropylene-based, etc. Woven fabric, non-woven fabric, synthetic leather, synthetic resin impregnated fabric, polyethylene film, polypropylene film, polyamide film, polyvinyl chloride film, polyvinylidene chloride film, polyethylene terephthalate film, etc.
Includes flexible or rigid sheet plates.

As a method for applying camouflage to woven military cloth or plastic film, etc. using the pigment composition according to the present invention, woven cloth,
In the case of non-woven fabrics, the method involves blending the pigment composition with a binder such as an acrylic resin or polyurethane resin to form an oil-based or water-based paint, and impregnating or coating the woven or non-woven fabric with this paint.

In the case of synthetic fibers, it is also effective to produce colored fibers by blending a pigment composition during melt spinning without post-coating, and then to make woven or non-woven fabrics using the colored fibers.

Furthermore, as a method of applying camouflage to a plastic film material using a pigment composition, (1) a method of blending it into the plastic at the time of film production, that is, a method of blending the pigment composition and further adding stabilizers, solubilizers, A method of blending an antioxidant, etc. and forming it into a film or sheet using a conventional method such as extrusion using a T-die method, an inflation method, or forming a film using a calendar method.

(2) There is a method in which camouflage coloring is applied by applying a polymer solution or dispersion containing a pigment composition to the surface of a plastic film produced by an appropriate method.

In method (2), the binder polymer used in the coating solution is one that has excellent adhesiveness to the base film.

Useful polymers for this purpose include acrylic resins and polyurethane resins.

By covering military objects in forest areas with camouflage plastic films, etc. colored with the pigment composition of the present invention in a tone similar to that of tree leaves, the enemy can use remote sensing and infrared light from a remote location. Even when using a detector or infrared photography, the film colored with the pigment composition of the present invention has a far-infrared wavelength of 700 nm, the same as chloroplasts.
Since it shows a strong spectral reflectance curve in the wavelength range of m to 800 nm, no difference in wavelength is observed in this vicinity, making it particularly effective as a camouflage material in forest areas.

Hereinafter, the present invention will be specifically explained with reference to Examples.

Note that parts in the examples indicate parts by weight.

Example 1 400 parts of polyvinyl chloride resin powder, 160 parts of dioctyl phthalate, 40 parts of dioctyl adipate, 6 parts of calcium stearate, 8 parts of barium stearate, and an inorganic calcined pigment (CoO:Al2O3:Cr2O3 20%: 15
%: 65%), 5 parts of yellow lead, and 9 parts of chrome vermilion were added and kneaded for 3 minutes between mixing rolls heated to 160°C, and then kneaded at 170°C.
It was sandwiched between heated ferro plates and pressed for 3 minutes at a pressure of 100 kg/ffl to a thickness of 0.2 mm
A dark green film was obtained.

As a result of measuring the spectral reflectance of the obtained film, it showed a strong reflectance in the near-infrared region, as shown by the curve in FIG.

This reflectance curve almost matched the spectral reflectance curve of green tree leaves.

In addition, the light resistance test of this film resulted in 2,000
The color did not fade even after 0 hours.

Example 2 A fired pigment (Ti02:Co) was added to 100 parts of polyethylene resin.
O:NiO:Zn035%:15%:35%:15%)
A pigment composition consisting of 10 parts of polyazo yellow pigment, 0.6 parts of polyazo yellow pigment, and 0.2 parts of polyazo red pigment was added, and molded by the T-die method at a die temperature of 220°C to obtain a dark green film with a thickness of 0.2 mm.

As a result of measuring the spectral reflectance of the obtained film, it showed a strong reflectance in the near-infrared region, as shown by the curve in FIG.

This reflectance curve almost matched the spectral reflectance curve of green tree leaves.

In addition, the light resistance test of this film resulted in 2,000
The color did not fade even after 0 hours.

Comparative Example 1 A pigment composition consisting of 8 parts of copper phthalocyanine blue, 24 parts of yellow lead, and 28 parts of chrome vermilion was used instead of the pigment composition consisting of the fired pigment, yellow lead, and chrome vermilion used in Example 1. Otherwise, a dark green film with a thickness of 0.2 mm was obtained in the same manner as in Example 1.

As a result of measuring the spectral reflectance curve of the obtained film, the fourth
As shown in the figure, it did not show any strong reflectance in the near-infrared region.

Although this reflectance curve matched the spectral reflectance curve of green tree leaves in the visible region, it was completely different in the near-infrared region.

In addition, the light resistance test of this film resulted in 2,000
The color did not fade even after 0 hours.

Comparative Example 2 0.4 parts of titanium oxide, 30.2 parts of C,I Solvent Green, and 50.4 parts of C,I Solvent Green were used in place of the pigment composition consisting of the fired pigment, polyazo yellow pigment, and polyazo red pigment used in Example 2. A dark green film with a thickness of 0.2 mm was obtained in the same manner as in Example 2 except that the dye consisting of

The fifth result of measuring the spectral reflectance curve of the obtained film is
As shown in the figure, it shows a strong reflectance in the near-infrared region, and it almost matches the spectral reflectance curve of green tree leaves. However, as a result of the light resistance test of this film, 2 (the color fades in 1 hour, making it suitable for outdoor use. It was not suitable as such.

Furthermore, when dyes are used in soft polyvinyl chloride or polyolefin resins, they are not suitable for practical use because they cause severe elution phenomena (bleeding).

[Brief explanation of the drawing]

Figure 1 shows the spectral reflectance curve A of green leaves, the spectral reflectance curve (B) of the plastic film colored with copper phthalocyanine blue pigment + yellow lead, and Figure 2 shows the spectral reflectance curve of the colored film of Example 10. , FIG. 3 is a spectral reflectance curve of the colored film of Example 2, FIG. 4 is a spectral reflectance curve of the colored film of Comparative Example 1, and FIG. 5 is a spectral reflectance curve of the colored film of Comparative Example 2. .

Claims (1)

[Scope of Claims] 1. A pigment composition for camouflage cloth, camouflage sheet, and camouflage paint, characterized in that it contains green and blue inorganic fired pigments alone or together with yellow pigments as coloring components. 2. A pigment composition for camouflage cloth, camouflage sheet, and camouflage paint according to claim 1, which uses one or more types selected from the following A to C as green and blue inorganic fired pigments. . A CoO:AA203:Cr20s(1:(1
~3):(001~0.07)) o CoO:A120s(1'(1~3))z-T
i02:Coo:NiO:Zn0(1:(0,3~15
):(0,3-1.5):(03-1.5)) The numbers in parentheses above are the number of moles.