JP2010032114A - Camouflage material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camouflage material capable of suppressing an increase of reflectivity in an infrared ray area and free from the deterioration of camouflage performance by applying an inner layer material having an infrared ray absorption capacity, to solve a problem of the deterioration of camouflage performance in the infrared ray area in which the reflectivity of infrared ray on the whole laminated cloth is increased when the inner layer material is laminated on a back side of a lightweight sheer outer layer material. <P>SOLUTION: The camouflage material is composed of a laminated body of at least two or more layers, the outer layer material 1 having a camouflage pattern composed of camouflage colors of four stages, and the inner layer material 2 having the infrared ray absorbing capacity. An area increasing ratio is 10% or smaller in all of color phases of the outer layer material when an integrated area value of a curved line of reflectivity in infrared ray wavelength areas 600 to 1,200 nm in the case of laminating the outer layer material and the inner layer material is compared with an integrated area value of a curved line of the reflectivity of the single outer layer material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a camouflage material having excellent camouflage performance that can be incorporated into a general mountain field in the visible light and near infrared wavelength regions. More specifically, the present invention relates to camouflage materials used for shelters, covers, personal clothes, gloves, socks, shoes, overshoes, helmets, etc. used for tanks, aircraft, ships and the like.

  In recent years, infrared rays have been used to identify the existence of munitions facilities, military, etc., camouflage identification glasses (infrared region of 600 nm or more), infrared photographs (infrared region of 800 nm or more and 850 nm or less), night infrared exploration devices (900 nm or more) Infrared region of 1200 nm or less) is used. In order to disguise from this infrared detection, a camouflage pattern that is changed stepwise is necessary in order to match the reflectance of this infrared region with changes in the color and pattern of the visible region. In order to escape from these infrared identification methods, there is a need for a fake material used in shelters, covers, sheets, clothing using the same, and the like having infrared reflectivity similar to that in nature.

  Furthermore, as a method to counter sophisticated infrared exploration methods, it is desired to arbitrarily control the reflectance in both the visible light and infrared regions. The following are proposed as camouflaged materials for controlling the reflectance in the visible and infrared regions.

A camouflage print processing method having three different infrared reflectances of 20% or less, 20 to 40%, or 40% or more in an infrared region of 600 nm or more and 1200 nm or less using a vat dye and a sulfur dye on a vinylon fabric. It is exemplified (for example, see Patent Document 1).
In addition, using a vat dye for cotton-based knitted fabric, camouflage processing showing four different infrared reflectances of 600 nm to 660 nm, 700 nm to 720 nm, 740 nm to 760 nm, and 1000 nm to 1200 nm in the infrared region of 600 nm to 1200 nm is performed. A method for producing a camouflage cotton fabric has been proposed (see, for example, Patent Document 2).
In addition, when printing (printing) using anion (direct dye, acid dye, metal-containing dye) dye, vat dye, sulfur dye and pigment on polyamide (nylon) fabric, 70% to 95% of the total fabric area % Is colored with anionic dyes and / or vat dyes, 5% to 30% of the total fabric area is printed with pigments, and camouflaged fabrics exhibiting three or more different infrared reflectances have been proposed (e.g. (See Patent Document 3).
Furthermore, the coloring material has an affinity for the fiber in polyester or polyamide (nylon) fabric, and has an affinity for the fiber with 1 to 10% by weight of a dye having a specific infrared reflectivity in a specific infrared wavelength region. A fabric comprising 0.1 to 10% by weight of a pigment that does not have been proposed (see, for example, Patent Document 4).
However, the technique described above gives camouflage performance to the visible light and infrared regions by using the surface fabric, and fabrics and knitted fabrics that are thick and have high density are used.

There has been proposed a fabric in which an aromatic polyamide (nylon) fabric is camouflaged with a color material having a high infrared reflectivity and a color material having a low infrared reflectivity in a specific infrared wavelength region (for example, (See Patent Document 5).
In addition, a polyamide (nylon) fabric is dyed with a dye mainly composed of an acid dye to give a camouflage pattern having a multi-stage infrared reflectance of 5% or more and 60% or less in an infrared wavelength region of 600 nm to 1400 nm. A camouflage-processed polyamide fabric characterized by having a moisture-permeable and waterproof process on one side is proposed (see, for example, Patent Document 6).
However, any conventional technique uses a polyamide fiber (nylon) woven fabric with a small single fiber fineness and does not have an infrared absorbing layer on the back side (skin side) of the woven fabric. .

A highly permeable woven fabric having a single fiber fineness of 5 to 11 denier and a near-infrared transmittance of 50% or more, and colored with either a dye or a dye and a pigment; and The colored highly transparent fabric has a near-infrared reflectance in the range of 5% to 70%, and has a camouflage pattern composed of at least four stages of camouflage colors. A camouflage processed fabric characterized in that a low-infrared reflective resin film containing at least one selected from infrared absorbers is formed (see, for example, Patent Document 7).
However, there is no provision of an infrared absorbing layer disposed on the back side of a highly permeable fabric, and a fake material cannot be provided for general use.

A masterbatch comprising 5 to 40% by weight of carbon black and 95 to 60% by weight of a polyethylene terephthalate copolymer polyester in which 5 to 20% by mole of an isophthalic acid component is copolymerized based on the total acidic component, and polyethylene not containing carbon black A black original polyester fiber obtained by mixing and melt spinning a matrix polymer composed of terephthalate, and the content of carbon black in the fiber and the content of the copolyester are each 0.5% based on the fiber weight. Flameproof black original polyester fibers of up to 2.0% by weight and 2 to 10% by weight have been proposed (see, for example, Patent Document 8).
Further, it contains 0.3 to 1.0% by weight of carbon black having characteristics of an average primary particle size of 5 to 25 μm, an oil absorption of 30 to 80 ml / 100 g, and a specific surface area of 150 to 300 m ² / g. Black original polyester fibers have been proposed (see, for example, Patent Document 9).
Further, it contains 0.1 to 1.5% by weight of a channel type carbon black pigment, 0.01 to 0.1% by weight of a copper compound, 0.05 to 0.5% by weight of an imidazole compound, and A black original polyamide fiber characterized in that the strength retention after the test is 90% or more has been proposed (for example, see Patent Document 10).
However, there is no description about the use which uses black original synthetic fiber containing carbon black etc. as a camouflage material like this invention.

Japanese Patent Laid-Open No. 02-154084 Japanese Patent Application Laid-Open No. 07-157980 Japanese Patent Laid-Open No. 05-060496 Japanese Patent Laid-Open No. 05-132879 JP 63-0666385 A Japanese Patent Laid-Open No. 05-222682 JP 2001-055669 A Japanese Patent Laid-Open No. 08-013248 Japanese Patent Laid-Open No. 09-250026 JP 2000-226730 A

  The present invention was made in the background of the problems of the prior art, and when the inner layer material is laminated on the back side of the outer layer material that is lightweight and transparent, the infrared reflectance in the entire laminated fabric becomes high and the infrared region is increased. The camouflage performance of the camouflage performance has been impaired, but by disposing the inner layer material imparted with infrared absorption ability, the increase in reflectance in the infrared region is suppressed, and the camouflage material that does not impair the camouflage performance is provided. is there.

In order to solve the above problems, the present invention has been completed as a result of intensive studies. That is, the present invention is as follows.
A camouflage material consisting of a laminated structure of at least two layers of an outer layer material having a camouflage pattern composed of 1.4 stages of camouflage color and an inner layer material imparted with infrared absorption ability, the outer layer material and the inner layer material The integrated area value of the reflectance curve in the infrared wavelength region 600 nm to 1200 nm of the laminated structure in which the layers are laminated is 10% in the area value increase rate in all the hues of the outer layer material with respect to the integrated area value of the reflectance curve of the outer layer material alone. Disguise material that is less than or equal to%.
2. 2. The camouflage material according to 1 above, wherein the inner layer material imparted with infrared absorbing ability is composed of a structure in which carbon black is fixed or kneaded, or a structure containing activated carbon.

  The present invention provides a camouflage function with excellent camouflage function in the visible light region and camouflage performance in the infrared region by arranging an inner layer material layer imparted with infrared absorption ability on the back side of the outer layer material that is lightweight and transparent. By providing the material, it is possible to disguise from infrared detection, and as an example of an additional function of disposing the inner layer material, there is an advantage that intrusion of fine particles from the outside can be suppressed at the same time.

Hereinafter, the present invention will be described in detail.
The reflectance in the infrared wavelength region will be described. It is necessary to bring the reflectance in the infrared wavelength region of the camouflage material close to the reflectance in the infrared wavelength region of the natural environment, and usually, flowers, leaves of coniferous trees, leaves of coniferous trees, dry sand, wet sand, rock soil The reflectance of 600 nm to 1200 nm in the infrared wavelength region is as shown in Table 1, and the black part of camouflaged camouflaged material corresponds to wet sand and rock soil existing in the natural environment. Part, dark green part and brown part correspond to those excluding wet sand and rock.

  Therefore, even when the outer layer material and the inner layer material are laminated, it is desired that the reflectance of 600 nm to 1200 nm in the infrared wavelength region of the laminated structure does not change. When the change in reflectance is large, the reflectance is in the infrared wavelength region different from the natural environment, and depending on the detection wavelength region, there is a high possibility of being discovered by infrared detection, and the meaning of impersonation is lost.

  Infrared detection methods include methods such as an infrared filter method, an infrared photography method, and an infrared night-time mirror method, and there is a high possibility that a new detection method will be developed. These detection methods are widely used in recent years because they can be effectively detected at long distances and in the case of foggy or nighttime, and are generally used in the range of 600 nm to 760 nm. Alternatively, detection is performed using infrared rays of 1000 nm to 1200 nm. In order to defend against detection of the infrared region, a camouflage pattern in which the reflectance of the infrared region is changed stepwise by merging with the change in the color and pattern of the visible light region is necessary.

  The outer layer material used in the present invention will be described. Outer layer material is natural fiber such as cotton, wool, hemp (linen, ramie), regenerated cellulose fiber such as rayon, cupra, polynosic, purified cellulose, polyethylene terephthalate, cationic dyeable polyethylene terephthalate, polytrimethylene terephthalate, etc. And other synthetic fibers (polyamide, acrylonitrile, acetate, polyvinyl chloride, polyethylene, polypropylene, polyurethane, polyimide, fluorine, polybenzazole, polylactic acid, etc.). A woven fabric, a knitted fabric having a single layer or two or more uniform mixing (blending, blending), group mixing (cross-twisting, fine spinning-twisting), two-layer structure and three-layer structure (sea core, core span), and A nonwoven fabric may be used, but a fabric excellent in mechanical strength such as tensile strength and abrasion strength is preferable.

  Next, secondary processing of the outer layer material will be described. The outer layer material is subjected to underbleaching, dyeing, and finishing as necessary. In the subbleaching process, a desizing process, a refining process, a bleaching process, and a mercerizing process are performed as necessary. In the desizing process, the removal of glue attached to the fabric in the warping process of the fabric is called desizing, and it is made water-soluble using an enzyme agent, an oxidizing agent or the like, and is removed by washing with water. In the refining process, an inorganic refining agent and a surfactant are used to remove them by chemical action such as dissolution and decomposition, and mechanical action. In the bleaching process, a small amount of dye remaining after refining is decomposed by the action of oxidation, reduction, etc. of the bleaching agent. This is performed for the purpose of improving the color, imparting shrinkage resistance, and improving dyeability. Since the characteristics of the processed outer layer material differ depending on the characteristics of the machine, the alkaline aqueous solution and the processing temperature are not particularly limited.

  Next, the dyeing process will be described. As an example of camouflage processing in the visible light region, a technique for manufacturing a camouflaged material having four hues (light green color, dark green color, brown color, and black color) will be described. Note that the number of hues can be appropriately selected and used according to the use environment.

  The manufacturing method having a light green color, dark green color, brown color and black color camouflage pattern is first dyed into a light green color with a dye, and then the surface of the material with a pigment or a dye and a printing base paste. Are dyed in dark green, brown and black colors. Even if the material of the black part that has been dyed by printing drops, the material that has been dyed and dyed light green can prevent the performance of camouflage from deteriorating.

  There are generally three types of manufacturing methods, such as red, blue, yellow, green, brown, orange, etc., for producing light green, dark green and brown hues and a predetermined infrared reflectance. The above color materials are used. Most generally, a dyed product obtained using three primary colors in which Red, Blue, and Yellow are used as primary colors can have a specific infrared reflectance depending on the blending ratio. However, unlike the light green color, dark green color, brown color hue, and infrared reflectance, the black infrared reflectance is generally set using a single color material. As the most common primary colors, Red, Blue, Yellow and other Black systems can be used in combination, but the amount is extremely small.

  Black black dyes are reactive dyes, acid dyes, vat dyes, sulfur dyes, preferably vat dyes, sulfur dyes for cellulose and vinylon fibers, and disperse dyes for polyester fibers. However, acidic dyes are used for wool and polyamide fibers, and cationic dyes are used for metal-containing fibers and acrylonitrile (acrylic) fibers. These dyes can be printed and dyed by kneading with water to which a printing paste is added. Moreover, the solid substance of carbon black can be fixed. In addition, if necessary, a pigment and a dye can be used in combination. However, when a pigment is used as compared with the use of a dye alone, the mass increases and there is a risk of migration, and it is preferable to use a dye. However, it is not particularly limited.

  As the black black pigment, an organic pigment or an inorganic pigment is used, and in particular, a carbon black pigment, a perylene black pigment, or the like can be used. Although an average particle diameter is not specifically limited, It is preferable that it is a particle diameter of 200 nm or less, and the fabric excellent in the infrared absorption ability which coat | covered the fiber surface can be obtained.

  Carbon black is known to be obtained from a manufacturing method such as a furnace-type incomplete combustion method, a channel-type incomplete combustion method, a thermal decomposition method, or an acetylene method, but the manufacturing method is not particularly limited.

  The manufacturing method for coating the surface of the fiber with pigment, carbon black, organic carbide, etc. uses a fixing agent (binder, resin agent), and the fixing agent includes acrylonitrile (acrylic), urethane, and polyethylene. Polyamide (nylon) type may be mentioned, but it may be used alone or in combination. Further, if necessary, a sticking agent having flame resistance can be used.

  Next, finishing will be described. Depending on the application, functional processing such as flexible processing, waterproof processing, water and oil repellency processing, antibacterial and deodorant processing, water absorption and sweat absorption processing, anti-pill processing, light reflection processing, antifouling processing, flameproof processing, etc. Is possible.

  Next, the inner layer material imparted with infrared absorption ability disposed on the back side of the outer layer material will be described.

  The reflectance of 600 nm to 1200 nm in the infrared wavelength region of the inner layer material alone used in the present invention is preferably 35% or less. When the reflectance of 600 nm or more and 1200 nm or less in the infrared wavelength region exceeds 35%, when the outer layer material and the inner layer material are laminated, the reflectance in the infrared wavelength region of 600 nm or more and 1200 nm or less increases, and the camouflage effect is impaired.

  Examples of the inner layer material used in the present invention include a resin structure (film, membrane) or a fiber structure. The material of the resin structure is not particularly limited as long as it is a resin capable of forming a film. Polyester, copolymer polyester, polyamide, polyamideimide, polyurethane, silicon, polyacrylate, polyacrylonitrile, polyolefin, ethylene-vinyl alcohol-based copolymer. Polymers having a film-forming property such as polyvinyl alcohol, cellulose, and cellulose derivatives may be used.

  In addition, the thickness of the resin structure (film, film) is not particularly limited, but in consideration of workability for providing an infrared absorber that absorbs at 600 nm to 1200 nm in the infrared wavelength region shown below, 5 μm or more. Preferably, the thickness is 10 μm or more, and when the thickness is less than 5 μm, there is a concern that if the infrared absorber is fixed or kneaded, it will fall off.

In addition, the basis weight of the resin structure (film, film) is not particularly limited, but considering use in a shelter, cover, clothes, etc. as a fake material, it is 800 g / m ² or less, more preferably 700 g / m ² or less. is there.

In addition, the resin structure (film, film) may have a moisture-permeable function in consideration of use as a disguise material in a shelter, a cover, clothes, and the like. The moisture permeability is not particularly limited, but is 30 g / m ² · h or more, more preferably 50 g / m ² · h or more in consideration of comfort.

  The material of the fiber structure is natural fibers such as cotton, wool, hemp (linen, ramie), regenerated cellulose fibers such as rayon, cupra, polynosic, purified cellulose, polyethylene terephthalate, cationic dyeable polyethylene terephthalate, polytrimethylene terephthalate And other synthetic fibers (polyamide, polyacrylonitrile, polyurethane, acetate, polyvinyl chloride, polyethylene, polypropylene, polyimide, fluorine, polybenzazole, polylactic acid, etc.). Even woven fabrics, knitted fabrics and non-woven fabrics consisting of two or more types of uniform mixing (mixed spinning, mixed fiber), group mixing (cross-twisting, fine spinning-twisting) and two-layer structure and multilayer structure (sea core, core span) I do not care.

  Further, the fiber diameter of the fiber structure is not particularly limited, but is 30 nm or more, more preferably 50 nm or more in consideration of workability for providing an infrared absorbent that absorbs in the infrared wavelength region of 600 nm to 1200 nm. .

Furthermore, the basis weight of the fiber structure is not particularly limited. However, since the fiber structure having infrared absorbing ability requires a certain woven (knitting) density, it is 10 g / m ² or more, more preferably 15 g / m ^2. That's it.

  Even when the inner layer material used in the present invention is a layer that does not absorb in the infrared wavelength region of 600 nm or more and 1200 nm or less (hereinafter referred to as infrared reflection layer), an infrared absorber is kneaded or fixed and used. Also good.

  The infrared absorber is not particularly limited as long as it is a substance that absorbs in the infrared wavelength region of 600 nm or more and 1200 nm or less. However, the above-described carbon black, black black pigment, dye, or absorption in the infrared region is used. An azo compound, an aminium compound, a dye, and the like having them may be used alone or in combination.

  The average particle diameter of the infrared absorbent is preferably 200 nm or less in consideration of processability such as fixation to the inner layer material and kneading.

  In the present invention, for example, a resin structure (film, film) in which an infrared absorber can be kneaded or a structure 1 kneaded in a fiber structure, and the infrared absorber through a resin (for example, a binder resin). There is a structure 2 fixed to a resin structure (film, membrane) or fiber structure.

  When the resin forming the resin structure (film, film) or fiber structure in the present invention is a resin that can be kneaded with an infrared absorber, the structure 1 is effective. Examples of resins that can be kneaded with infrared absorbers such as carbon black include polyester, copolymer polyester, polyamide, polyamideimide, polyurethane, silicon, polyacrylate, polyacrylonitrile, polyolefin, ethylene-vinyl alcohol copolymer, polyvinyl alcohol, Examples thereof include cellulose and cellulose derivative resins. By using a resin in which such an infrared absorbent is kneaded, the inner layer material imparted with the infrared absorbing ability of the present invention can be obtained. The amount of the infrared absorbent to be kneaded is usually preferably 0.2 to 10% by weight. When the content of the infrared absorber is less than 0.2% by weight, sufficient infrared absorption performance cannot be exhibited. Conversely, when the content exceeds 10% by weight, the moldability of the structure tends to deteriorate.

  In addition, the structure 2 is effective when the material cannot be kneaded with the infrared absorber. Examples of materials that cannot be kneaded with an infrared absorber include natural fibers such as cotton, hemp, wool, and silk. After forming the material into a fiber structure, the infrared absorbing layer of the present invention is obtained by fixing an infrared absorbing agent via a binder resin or the like. In addition, about the raw material which an infrared absorber can knead | mix, you may fix an infrared absorber through a binder etc.

  In the structure 1, the kneading of the infrared absorbent into the resin structure and the fiber structure can be performed by means known in the art. For example, as a method of kneading an infrared absorber into a fiber, a resin in which the infrared absorber is kneaded by a known means is processed into a fiber or a resin layer by a conventionally known method such as melt spinning, wet spinning, or dry spinning. A method is mentioned.

  In structure 2, there is no particular limitation as long as the infrared absorber can be fixed. Examples of the adhesive to be fixed include polyurethane-based cross-linked resins and acrylic cross-linked resins (for example, self-cross-linked acrylic ester-based resins). Binder resins, etc.), silicon-based crosslinkable resins, epoxy-based crosslinkable resins, polyamide-based crosslinkable resins, polyester-based crosslinkable resins, polyvinyl alcohol resins, and the like. These may be used alone or in combination of two or more. May be used. Among these, a silicone-based cross-linked resin or a self-cross-linked acrylic ester resin is preferable because it has an effect of fixing washing durability, and particularly has both heat resistance and washing durability.

Examples of the method for fixing the infrared absorber include a method in which a working fluid containing the infrared absorber is applied by a method such as a padding method, an impregnation method, a spray method, or a coating method, followed by drying and curing. Drying is preferably performed at a temperature of about 80 ° C. to 200 ° C. for 30 seconds to 60 minutes, particularly about 95 ° C. to 120 ° C. for 1 minute to 30 minutes.
Moreover, after drying, it is preferable to carry out curing in order to firmly fix it. The curing is preferably performed at about 130 ° C. to 180 ° C. for 30 seconds to 10 minutes.

  In the processed resin, a softening agent, a texture adjusting agent, a catalyst, a pH adjusting agent, a functional processing agent, a thickening agent, etc. may be blended, and these may be used alone according to their respective uses, Two or more types may be used in combination.

  Examples of the functional processing agent include deodorants, antibacterial deodorants, antifouling agents, insect repellents, ultraviolet absorbers, water and oil repellents, and the like. These may be used alone or in combination of two or more depending on the application.

  Furthermore, as an inner layer material imparted with infrared absorbing ability, a resin structure or fiber structure containing activated carbon, particulate activated carbon, and fibrous activated carbon may be used alone or in combination.

  For example, the raw materials for fibrous activated carbon include natural cellulose fibers such as cotton and hemp, regenerated cellulose fibers by solvent spinning methods such as rayon and polynosic, and also polyvinyl alcohol fibers, acrylic fibers, aromatic polyamide fibers, lignin fibers, Synthetic fibers such as phenol fibers and petroleum pitch fibers can be mentioned. Regenerated cellulose fibers, phenol fibers and acrylic fibers are preferred from the physical properties (particularly strength) of the obtained fibrous activated carbon and adsorption performance. After weaving, knitting, and nonwoven fabric using these short fibers or long fibers of the raw material fibers and containing a suitable flameproofing agent as necessary, flameproofing treatment is performed at a temperature of 450 ° C. or lower, Subsequently, fibrous activated carbon can be manufactured by the well-known method of activating carbonization at the temperature of 500 degreeC or more and 1000 degrees C or less.

  The method for forming fibrous activated carbon into a sheet is a method of adhering a gas adsorbing substance to a sheet substrate with a binder, or a method in which an adsorbent is made into a slurry containing an appropriate pulp and binder and made by a wet paper machine, or an activity. Examples thereof include a known method of carbonizing and activating carbon fiber raw material fibers in advance by weaving, knitting, or non-woven fabric, and, if necessary, flameproofing treatment. Examples of the fibrous activated carbon sheet include woven, knitted, non-woven, felt, paper, and film, but are woven and knitted due to flexibility, durability, and ease of lamination. Is preferred.

In addition, the particulate activated carbon (granular activated carbon) can be used in a wide range as long as it is a carbon material having a large specific surface area of several hundred m ² or more per gram and exhibiting high adsorbability. As the raw material of the activated carbon, usually a carbonized material such as coconut shell or wood or coal is used, and any of them may be used. However, when it is used while being supported inside the fiber structure of the camouflage material, fine particles may be generated due to friction between the activated carbon particles during use, which is not preferable. For this reason, in order to prevent generation | occurrence | production of the microparticles | fine-particles by the friction between activated carbon particles, the thing with high hardness of activated carbon is preferable.

  The form of the particulate activated carbon sheet needs to be in a powder form because it is used while being supported inside the sheet-like fiber structure. The particle size is the woven, knitted, non-woven, felt, paper, and film shapes carrying activated carbon powder. Since the feeling is preferably soft touch, the particle size is preferably fine. In addition, the fine particle size has an advantage that the adsorbing speed of chemicals, agricultural chemicals and the like is increased because the surface area per weight is increased, in addition to the excellent contact feeling when worn. In order to enhance the removal effect of these harmful components, it is preferable to increase the carrying amount. However, if the carrying amount is increased, the bendability of the knitted fabric or the nonwoven fabric is lowered and the feeling of contact with hands and fingers is hard. Become. In order to increase the effect by reducing the amount used, fine particles having a large surface area, that is, fine particles are preferable, and there is an advantage that the fine particles are easily supported on the fiber structure.

  When the integrated area value of the reflectance curve in the infrared wavelength region 600 nm to 1200 nm when the outer layer material and the inner layer material are laminated is compared with the integrated area value of the reflectance curve of the outer layer material alone, the integrated area of the reflectance curve The increase rate of the value is preferably 10% or less in all hues of the outer layer material, more preferably 1% or less in the black part, 5% or less in the brown part, 9% or less in the dark green part, light green The percentage is 10% or less. When the area increase rate of each hue exceeds the above, it cannot be a material having a desired reflectance.

  Next, the present invention will be specifically described using Examples and Comparative Examples, but the present invention is not limited to these Examples. In addition, evaluation as described in an Example and a comparative example is the method shown below.

(Count)
According to JIS L 1096 (1999) 8.8.
(thickness)
According to JIS L 1096 (1999) 8.5.
(mass)
According to JIS L 1096 (1999) 8.4.
(Mixed rate)
According to JIS L 1030-1 (1998) and JIS L 1030-2 (2005).
(density)
According to JIS L 1096 (1999) 8.6.
(Infrared reflectance)
According to UV-3101 (manufactured by Shimadzu Corporation).
The increase rate of the integrated area value of the reflectance curve was calculated using Equation 1.
Increase rate of integrated area value of reflectance curve = (B / A−1) × 100 (%) Equation 1
A: Integrated area value of reflectance curve from 600 nm to 1200 nm of outer layer material alone B: Integrated area value of reflectance curve from 600 nm to 1200 nm of laminated structure of outer layer material and infrared absorption layer (impersonation performance)
By integrating the outer layer material and the inner layer material, the integrated area value of the infrared reflectance in the infrared wavelength region of 600 nm to 1200 nm was measured, and compared with the integrated area value of the reflectance curve of the outer layer material alone, to determine the camouflage performance. In addition, when the area increase rate was 10% or less, the camouflage performance was good, and the others were bad.

<Method for producing outer layer material>
Using composite spun yarn 40/1 cotton count mixed with 95% Supima cotton (manufactured by Toyobo Co., Ltd.) and 5% nylon filament of 8 dtex 5 filaments (type T-880: manufactured by Toyobo Co., Ltd.), air Weaving was performed using a jet loom to obtain a 2/1 twill fabric. Subsequently, hair roasting, desizing, refining, bleaching, and mercerizing were performed in a conventional manner. Further, light green dip dyeing was performed under the conditions shown in Table 2 below, and color development was performed by pad chemical steam treatment, oxidation, soaping, and hot water washing.

  Next, printing dyeing using a flat screen was performed under the conditions shown in Table 3 below, followed by washing with water.

Next, the dyed fabric is immersed in an aqueous solution containing 40% of N-methyloldimethylphosphonopropionic acid amide (Pyrovatex CP new, Ciba Specialty Chemicals KK) and 0.5% ammonium chloride. Furthermore, it is immersed in an aqueous solution containing 30 g / L of Meitex HP600 (manufactured by Meisei Chemical Co., Ltd.), squeezed so that the wet pickup is 65%, dried and heat-treated, and the vertical density is 140 / 2.54 cm. An outer layer material woven fabric having a weft density of 110 pieces / 2.54 cm and a mass of 170 g / m ² was obtained.

<Method for producing black woven polyester fabric>
A plain woven fabric was obtained by weaving with a water jet loom using 55 decitex 22 filament Tetoron black original yarn (manufactured by Teijin Limited). Subsequently, refining processing and heat setting were performed by a conventional method to obtain a black original polyester woven fabric having a vertical density of 180 / 2.54 cm, a weft density of 112 / 2.54 cm, and a mass of 70 g / m ² .

<Production method of black original polyurethane fabric>
Polyurethane resin in which 3.5% by weight of carbon black (average particle diameter: 35 nm) was uniformly mixed was coated on a plain fabric having a mass of 60 g / m ^{2 made} of nylon having 78 dtex 96 filaments. This was introduced into water at 20 ° C., solidified for 3 minutes, and then dried in an oven at 130 ° C. to obtain a black original polyurethane film to which carbon black having a resin layer thickness of 40 μm was added. The resulting black original polyurethane fabric had a thickness of 0.16 mm and a mass of 98 g / m ² .

<Production method of black acetate cellulose acetate membrane dough>
Cellulose acetate (L-30, manufactured by Daicel Chemical Industries, Ltd.) having an acetylation degree of 55% and a 6% viscosity of 70 × 10 ⁻³ Pa · S was used, and the solvent was a 1: 1 mixed solution of methyl ethyl ketone and N, N dimethylformamide. Was used to prepare a cellulose acetate solution having a solid concentration of 15% by weight. Then, the cellulose acetate solution was produced by mixing and stirring at room temperature so that it might become 3.5 weight% of carbon black (average particle diameter of 35 nm). This solution was cast on a release paper (manufactured by Lintec Corporation), applied while adjusting the film thickness with a coating knife, and dried in an oven. After drying at 70 ° C. for 1 minute, drying was performed at 130 ° C. for 2 minutes. Thereafter, the obtained cellulose acetate film and a polypropylene spunbonded nonwoven fabric (2.2 dtex, 50 g / m ² ) were bonded to each other with a nonwoven fabric hot melt adhesive (Dynak, Kureha Tech Co., Ltd.). The obtained cellulose acetate film fabric had a thickness of 0.25 mm and a mass of 57 g / m ² .

<Method for producing carbon black-fixed nonwoven fabric>
After impregnating polyester spunlace nonwoven fabric (2.2 dtex, 30 g / m ² ) into a paste bath of acrylic binder 15 L, carbon black 15 kg, defoaming agent 6.0 g, and water 85 kg, the wet pickup becomes 250%. Thus, the carbon black fixed nonwoven fabric was obtained by drying and heat treatment at 100 ° C. The obtained carbon black fixed nonwoven fabric had a thickness of 0.28 mm and a mass of 41 g / m ² .

<Method for producing activated carbon sheet>
A knitted fabric having a mass of 220 g / m ² consisting of a novolac phenol resin fiber spun yarn having a single fiber fineness of 2.2 decitex and 20/1 cotton count is heated in an inert atmosphere at 400 ° C. for 30 minutes, and then 890 ° C. For 20 minutes until heated in an inert atmosphere for carbonization, and then activated by heating at 890 ° C. for 2 hours in an atmosphere containing 12% by weight of water, with a mass of 120 g / m ² and a specific surface area of 1400 m. An activated carbon sheet having a thickness of ² / g and a thickness of 0.80 mm was obtained.

<Method for producing polyester fabric>
A regular polyester yarn of 55 dtex 24 filaments (manufactured by Toyobo Co., Ltd.) was used to weave using a water jet loom to obtain a plain fabric. Next, a refining process and heat setting are performed by a conventional method, and a polyester having a vertical density of 181 pieces / 2.54 cm, a weft density of 111 pieces / 2.54 cm, a thickness of 0.11 mm, and a mass of 72 g / m ² A woven fabric was obtained.

<Method for producing spunlace nonwoven fabric>
A card web of polyester fibers (fineness: 1.9 dtex, fiber length: 45 mm) was formed, and a 40 g / m ² non-woven fabric was dried by a water punch. The thickness of the obtained nonwoven fabric was 0.31 mm.

<Example 1>
A camouflaged material was obtained by superimposing the outer layer material and the black original polyester fabric. Table 4 shows the rate of increase in the integrated area value of the reflectance curve of the camouflaged material and the camouflage performance.

<Example 2>
A camouflaged material was obtained by overlaying the outer layer material and the black original polyurethane fabric. Table 4 shows the rate of increase in the integrated area value of the reflectance curve of the camouflaged material and the camouflage performance.

<Example 3>
A camouflaged material was obtained by superposing the outer layer material and the black-coated cellulose acetate membrane material. Table 4 shows the rate of increase in the integrated area value of the reflectance curve of the camouflaged material and the camouflage performance.

<Example 4>
A camouflaged material was obtained by superimposing the outer layer material and the carbon black fixed nonwoven fabric. Table 4 shows the rate of increase in the integrated area value of the reflectance curve of the camouflaged material and the camouflage performance.

<Example 5>
A camouflaged material was obtained by overlaying the outer layer material and the activated carbon sheet. Table 4 shows the rate of increase in the integrated area value of the reflectance curve of the camouflaged material and the camouflage performance.

<Comparative Example 1>
A camouflaged material was obtained by overlaying the outer layer material and the polyester fabric. Table 4 shows the rate of increase in the integrated area value of the reflectance curve of the camouflaged material and the camouflage performance.

<Comparative example 2>
A camouflage material was obtained by using a cellulose acetate resin to which an outer layer material and carbon black had not been added, and superposing cellulose acetate membrane fabrics prepared according to the same preparation recipe as the black original cellulose acetate membrane. Table 4 shows the rate of increase in the integrated area value of the reflectance curve of the camouflaged material and the camouflage performance.

<Comparative Example 3>
A fake material was obtained by superimposing the outer layer material and the spunlace nonwoven fabric. Table 4 shows the rate of increase in the integrated area value of the reflectance curve of the camouflaged material and the camouflage performance.

  In the laminated structure of the example, the increase rate of the integrated area value of the reflectance curve is 10% or less in all camouflage colors as compared with the integrated area value of the reflectance curve of the outer layer material alone, and the change in reflectance is While it is a small and good camouflage material, the laminated structure of the comparative example has a result that the rate of change of the integrated area value of the reflectance curve is large and cannot be a desired material.

  The camouflaged sheet of the present invention is a material composed of a laminated structure of at least two layers of an outer layer material and an inner layer material imparted with infrared absorption ability, and even when the inner layer material is arranged, the change in infrared reflectance is small, Excellent camouflage performance can be obtained, and it can be used for shelters, covers, personal clothes, gloves, socks, shoes, overshoes, helmets, etc. used for tanks, aircraft, ships, etc. It is important to contribute to the industry.

It is a schematic sectional drawing which shows an example of the laminated structure of the structure 1 of this invention. It is a schematic sectional drawing which shows an example of the laminated structure of the structure 2 of this invention.

Explanation of symbols

1: Outer layer material 2: Inner layer material (infrared absorber kneaded resin structure or fiber structure)
3: Outer layer material 4: Infrared absorber fixing layer 5: Inner layer material (resin structure or fiber structure)

Claims (2)

  A camouflage material consisting of a laminated structure of at least two layers of an outer layer material having a camouflage pattern composed of four stages of camouflage colors and an inner layer material imparted with infrared absorption ability, and the outer layer material and the inner layer material are laminated. The integrated area value of the reflectance curve in the infrared wavelength region 600 nm to 1200 nm of the laminated structure is 10% or less of the area value increase rate in all hues of the outer layer material with respect to the integrated area value of the reflectance curve of the outer layer material alone. Is a camouflaged material.   The camouflage material according to claim 1, wherein the inner layer material imparted with infrared absorbing ability comprises a structure in which carbon black is fixed or kneaded, or a structure containing activated carbon.