JPH0559152B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a new military camouflage colored paint,
More specifically, a military camouflage colored paint effective for infrared search is coated with a coating film containing carbon black pigment as an infrared absorbing pigment, hydrated silicic acid fine particles, anhydrous silicic acid fine particles, or a mixture thereof as an infrared diffuse reflector. provide. Military equipment coated with the camouflage colored paint of the present invention has low infrared reflectance against infrared irradiation and has an excellent camouflage effect against infrared search. (Prior Art) Traditionally, military facilities, vehicles, ships, aircraft, military equipment such as clothing, etc. have been carefully inspected to avoid visual detection by checking the surrounding environment and objects existing there. They are often disguised with camouflage that makes it difficult to distinguish them and creates an illusion. For example, in grasslands and forests, military equipment is painted with a dark green camouflage similar to that of plants.
In fields, mountains, deserts, etc. where soil, sand, rocks, etc. are the main materials, military equipment is coated with dark brown or dark brown camouflage, and in snowy fields, white cloth or camouflage is applied to military equipment. Camouflage methods, etc., are used to cover articles with sheets. (Problem to be solved by the invention) However, with the recent development of optoelectronic equipment, it is now possible to detect military equipment by emitting electromagnetic waves other than visible light, such as infrared rays, and detecting military equipment by its reflection. It has become possible to guide guided missiles, and it has become possible to carry out attacks using infrared search even at night or with sufficient camouflage in visible light. Therefore, there is a demand for the development of a technique for applying camouflage means to military equipment such as those described above that is effective not only for visual inspection but also for infrared search. (Means for Solving the Problems) As a result of intensive research in response to the above-mentioned demands of the prior art, the present inventors have developed a technology that protects against infrared rays by coating military equipment with a specific colored paint. The present invention was completed based on the finding that an effective camouflage effect against infrared rays can be provided by sufficiently possessing the function of diffusing and reflecting infrared rays and the function of absorbing infrared rays. That is, the present invention provides a camouflage paint used for applying camouflage paint to military equipment for infrared search, which contains, as its constituent components, 0.1 to 20% by weight of carbon black pigment in the total solid content, and hydrated silicic acid fine particles or anhydrous silicic acid particles. 5 to 5 silicic acid fine particles or a mixture thereof
A paint containing 30% by weight and 25 to 94.9% by weight of a film-forming material, which
Spectral reflectance for 2000nm infrared irradiation is 10%
This is a colored paint for camouflage for military equipment that is effective for infrared search, and is characterized by having a 60 degree specular gloss of 2% or less. (Preferred Embodiments) Next, the present invention will be described in more detail by citing preferred embodiments. The paint of the present invention has the function of coating military equipment and significantly reducing the reflective function of the military equipment against infrared irradiation, making it difficult or impossible to detect it with the light receiving section of the search system. Infrared rays used in conventional infrared search systems are mainly infrared rays emitted from infrared light emitting diodes, semiconductor lasers, gas lasers, solid state lasers, and the like. In the present invention, a carbon black pigment such as CI Pigment Black 6, CI Pigment Black 7, CI Pigment Black 8, CI Pigment Black 9 or CI Pigment Black 10 is used as the infrared absorbing pigment. These carbon black pigments are used in an amount of 0.1 to 20% by weight based on the total solid content of the paint. If the amount used is less than 0.1% by weight, the infrared reflectance of the military equipment obtained will be too high and insufficient, while if it exceeds 20% by weight, the infrared irradiation will be large, making it undesirable for military equipment. Furthermore, the infrared diffuse reflector used in the present invention is a material that provides diffuse reflection to incident infrared rays as described above, and is preferably, for example, hydrated silicic acid fine particles, anhydrous silicic acid fine particles, or a mixture thereof. . These diffuse reflectors account for 5 to 5% of the total solid content of the paint.
Use in a range of 30% by weight. If the amount used is less than 5% by weight, a sufficient infrared reflection and diffusion effect cannot be obtained.
In addition, the specular gloss is increased by 60 degrees, while the 30% by weight
Exceeding this is not preferable because the strength of the coating film decreases. The film-forming material may be any resin used in conventional paints. These film-forming materials make up the total solids content of the paint.
Use in the range of 25-94.9% by weight. If the amount used is less than 25% by weight, a film with sufficient strength will not be formed, while if it exceeds 94.9% by weight, the infrared reflectance of military equipment will increase and the 60 degree specular gloss will also increase, which is undesirable. The paint of the present invention consists of the above-mentioned two types of materials and a film-forming material that holds these materials, and further contains conventionally known suitable additives such as water, water, organic solvents, plasticizers,
It goes without saying that crosslinking agents, catalysts, etc. may also be included. The method of blending these essential components and optional components and mixing and dispersing fine particles such as pigments and hydrated silicic acid in the film-forming material to form a coating may be any conventionally known method, such as ball milling, sand milling, etc. Conventionally known methods using an attritor, a horizontal continuous media disperser, a two-roll, a three-roll, pressure kneader, Banbury mixer, extruder, etc. can be mentioned. Examples of military equipment to which the paint of the present invention is applied include ships, aircraft, various vehicles, weapons, ground structures, and materials used therefor. Examples of methods for applying paint to the above military equipment include blade coating, rod coating, knife coating, squeeze coating, air doctor coating, gravure coating, spray coating, roll coating, and brush coating. The military camouflage equipment obtained using the paint of the present invention as described above has significantly reduced infrared reflectivity. When measured, the spectral reflectance in the near-infrared region of 700 to 2000 nm was all 10.
% or less. In addition, when its 60 degree specular gloss was measured according to JISK5400, it was less than 2%.
It preferably exhibits a glossiness of 1% or less, and also exhibits a reflectance of 10% or less when measured with a magnified reflectance expressed as a percentage calibrated on a commonly used standard white surface of magnesium oxide at 45 degrees of incidence and 0 degrees of light reception. . (Operations/Effects) According to the present invention as described above, military camouflage equipment made of the paint of the present invention exhibits extremely low infrared reflectivity for infrared search that detects objects by irradiating infrared rays, Since military equipment reacts to infrared search as if it were an object or space that does not show reflection, it has an excellent camouflage effect against infrared search. (Example) Next, the present invention will be specifically described with reference to Examples. In the text, parts or % are based on weight unless otherwise specified. Example 1 Carbon black pigment 3.03 parts Talc 17.88 parts Hydrous silicic acid fine particles 6.05 parts Soybean oil modified alkyd resin 56.75 parts (oil length: 53%, solid content: 50%) Dryer (solid content: 30%) 0.93 part hydrocarbon solvent 15.36 parts Total 100.00 parts The above formulation was mixed, glass beads were added according to a conventional method, and the paint was dispersed using a paint shaker to obtain the paint of the present invention. The obtained paint was applied as a room temperature drying black enamel for metal materials onto an iron plate coated with anti-rust paint, and dried according to a conventional method to obtain military camouflage equipment according to the present invention. In order to examine the properties of the above coated plate against visible light and infrared rays, the reflectance of ultraviolet, visible and near infrared wavelengths was measured using a self-recording spectrophotometer, and the following results were obtained.

[Table] Also, the gloss of the above coated plate was measured using a digital gloss meter.
When measured at 60 degrees according to JISK5400, the glossiness was 0.3%. In addition, the incident angle of the above coated plate is 45 degrees and the light receiving angle is 0.
The diffuse reflectance at 3.5% was measured according to JISK5400 and was found to be 3.7%. These performances indicate that the above-mentioned coated plate is effective as camouflage against infrared irradiation search systems and guided missiles. Example 2 Carbon black pigment 5.04 parts Anhydrous silicic acid fine particles 5.04 parts Hydrous silicic acid fine particles 5.04 parts Soybean oil modified alkyd resin 60.58 parts (oil length: 53%, solid content: 50%) Dryer (solid content: 30%) 1.29 parts hydrocarbon System solvent 23.01 parts Total 100.00 parts The above formulation was blended and dispersed in the same manner as in Example 1 to obtain the coating material of the present invention. The obtained paint was applied as a room temperature drying black enamel for metal materials onto an iron plate coated with anti-rust paint and dried according to a conventional method to obtain military camouflage equipment according to the present invention. In the same manner as in Example 1, in order to examine the properties of the above-mentioned coated plate against visible light and infrared rays, the reflectance in the ultraviolet, visible, and near-infrared regions was measured using a self-recording spectrophotometer, and the following results were obtained. .

[Table] Also, the gloss of the above coated plate was measured using a digital gloss meter.
When measured at 60 degrees according to JISK5400, the glossiness was 0.3%. In addition, the incident angle of the above coated plate is 45 degrees and the light receiving angle is 0.
The diffuse reflectance at 3.4% was measured according to JISK5400. These performances indicate that the above-mentioned coated plate is effective as camouflage against infrared irradiation search systems and guided missiles. Note that in this specification, "camouflage" means a property that confuses infrared search.

Claims (1)

[Claims] 1. The camouflage paint used to coat military equipment with infrared ray detection camouflage paint contains 0.1% carbon black pigment in its total solid content.
~20% by weight, 5~30% by weight of hydrated silicic acid fine particles, anhydrous silicic acid fine particles, or a mixture thereof, and 25~94.9% by weight of a film-forming material, the paint film containing infrared rays of 700~2000 nm A colored paint for camouflage for military equipment effective for infrared search, characterized by a spectral reflectance of 10% or less and a 60 degree specular gloss of 2% or less.