Polytetrafluoroethylene radome film coating with optical camouflage function and preparation method

Abstract

The invention discloses a polytetrafluoroethylene radome film coating with an optical camouflage function and a preparation method thereof. The coating is a single-color or multi-color camouflage film coating coated on glass fiber plain cloth or a glass fiber plain cloth polymer film. Wherein the single-color camouflage paint film coating is a plurality of polytetrafluoroethylene coatings containing superfine particle camouflage paint, the multi-color camouflage paint film coating is a plurality of polytetrafluoroethylene coatings containing superfine particle camouflage paint, and the color of the single-color or multi-color camouflage paint film coating is matched with the environment where the single-color or multi-color camouflage paint film coating is located. The polytetrafluoroethylene radome film coating with the optical camouflage function is coated on the glass fiber plain cloth or the glass fiber plain cloth polymer film and is used for constructing facilities such as a large radar radome, and optical camouflage protection of the radome under visible light and near-infrared bands can be effectively realized.

Description

Technical Field

[0001] The present invention relates to the technical field of camouflage protection, and particularly relates to a polytetrafluoroethylene (PTFE) radome thin film coating with optical camouflage function and a preparation method thereof. Background Art

[0002] With the rapid development of modern detection technologies, the survival ability of important targets has been greatly threatened. Therefore, it is particularly important to improve the anti-detection ability of these important targets. Using stealth camouflage protection technology to protect ground targets has become an important means to improve their survival ability in the future. Stealth camouflage technology, also known as target signature control technology, makes it difficult to detect and identify a target by controlling or reducing its signature.

[0003] In recent years, new materials of polytetrafluoroethylene (PTFE) polymer thin films have been gradually applied to the protection of ground radar radomes. This kind of material is a white or bright-colored thin film polymer composite material and does not have the ground camouflage function. Its main manifestations are as follows: 1) The optical characteristics of the white thin film structure applied to the radar radome are significantly exposed and are extremely easy to be detected by aerospace reconnaissance, which brings great challenges to the survival protection ability of the radar; 2) The bright-colored polytetrafluoroethylene (PTFE) thin film polymer composite material has a poor fusion degree with the background ground soil color or green background, and its dielectric properties affect the wave transmission rate of radar waves.

[0004] Therefore, it is of great significance to innovate the polytetrafluoroethylene (PTFE) radome thin film material, based on the spectral reflection characteristics of the background in the visible light and near-infrared (0.38~1.2μm) bands, to form a ground object color pattern on the target through color control, eliminate or reduce the difference in optical characteristics between the target and the background, so as to achieve the purpose of reducing the target salience or distorting and dividing the target outline, preventing detection and not affecting the transmission of radar waves in the working band. Summary of the Invention

[0005] To solve the problem that the existing polytetrafluoroethylene (PTFE) radome thin film coating does not have the optical camouflage function, resulting in the decline of its survival protection ability, the present invention provides a polytetrafluoroethylene (PTFE) radome thin film coating with optical camouflage function and a preparation method thereof.

[0006] The present invention discloses a polytetrafluoroethylene radome film coating with optical camouflage function. The coating is a monochromatic camouflage film coating coated on a plain weave fiberglass cloth or a multicolor camouflage film coating coated on a polymer film of plain weave fiberglass cloth. The polymer film of plain weave fiberglass cloth coated with the coating is directly used as a radome. Among them, the monochromatic camouflage film coating is a multi-layer polytetrafluoroethylene coating containing ultrafine particle camouflage pigments, and the multicolor camouflage film coating is a multi-layer polytetrafluoroethylene coating containing ultrafine particle camouflage pigments. The color of the monochromatic camouflage film coating or the multicolor camouflage film coating is adapted to the surrounding environment.

[0007] As a further improvement of the present invention, the monochromatic camouflage film coating is coated on one or both sides of the plain weave fiberglass cloth, or the multicolor camouflage film coating is coated on one or both sides of the polymer film of plain weave fiberglass cloth. The thickness of the monochromatic camouflage film coating is greater than the thickness of the multicolor camouflage film coating.

[0008] As a further improvement of the present invention, the thickness of each layer of coating is 15 - 25 μm, preferably 20 μm. The monochromatic camouflage film coating is coated six layers with a thickness of 90 - 150 μm, preferably 120 μm. The multicolor camouflage film coating is coated three layers with a thickness of 45 - 75 μm, preferably 60 μm.

[0009] As a further improvement of the present invention, the ultrafine particle camouflage pigments include one or more of carbon black, titanium white, cadmium yellow, and cobalt blue, and the particle size of the ultrafine particle camouflage pigments is not greater than 6 μm.

[0010] As a further improvement of the present invention, through background investigation, the dominant color closest to the average brightness in the background is selected as the monochromatic camouflage color; or, the dominant color is used as the intermediate color of the multicolor deformation camouflage, and then the bright and dark differential colors are selected according to the requirement that the brightness contrast between different color camouflage patches is greater than 0.2.

[0011] As a further improvement of the present invention, the one-way wave transmission rate (power transmission coefficient) of the monochromatic or multicolor camouflage film coating within the radar operating band is not less than 85%.

[0012] As a further improvement of the present invention, the optical countermeasure band of the monochromatic or multicolor camouflage film coating is 0.3 - 1.2 μm.

[0013] The present invention also discloses a preparation method of a polytetrafluoroethylene radome film coating with optical camouflage function, including: Step 1: Add the polytetrafluoroethylene film coating solvent, pigments, and fillers into the batching tank in sequence, stir and mix evenly, and sand and disperse until the fineness is not greater than 6 μm; Step 2: Gradually coat a polytetrafluoroethylene film coating solvent containing ultrafine particle camouflage pigments with a mass fraction of not less than 90% onto a plain glass fiber cloth or a plain glass fiber cloth polymer film, and the coating thickness is adjustable. Step 3: Send it into a tunnel kiln for heating and curing, gradually raise the temperature to between 370 - 410 °C in stages, and the curing time is 2 - 8 min.

[0014] As a further improvement of the present invention, in the said Step 1, a ball milling method is adopted to prepare a polytetrafluoroethylene film coating solvent containing ultrafine particle camouflage pigments.

[0015] As a further improvement of the present invention, in the said Step 2, a roller coating method is adopted for the monochromatic camouflage film coating, and a screen printing method is adopted for the multicolor camouflage film coating.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention coats a polytetrafluoroethylene (PTFE) radome film coating with an optical camouflage function onto a plain glass fiber cloth or a plain glass fiber cloth polymer film for constructing facilities such as large radomes, which can effectively achieve the optical camouflage protection of the radome in the visible light and near-infrared bands; in addition, the present invention can realize the roller coating of the glass fiber polymer composite camouflage film material, saving the later painting time and cumbersome auxiliary work, improving work efficiency, and meeting the high-tech needs of the rapid development of the national defense industry. Specific Embodiments

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] The following is a further detailed description of the present invention: The present invention provides a polytetrafluoroethylene radome film coating with an optical camouflage function. The coating is a monochromatic camouflage film coating or a multicolor camouflage film coating coated on a plain glass fiber cloth or a plain glass fiber cloth polymer film, and the plain glass fiber cloth or the plain glass fiber cloth polymer film coated with the coating is directly used as a radome; wherein, the monochromatic camouflage film coating is a multi-layer polytetrafluoroethylene coating containing ultrafine particle camouflage pigments, the multicolor camouflage film coating is a multi-layer polytetrafluoroethylene coating containing ultrafine particle camouflage pigments, and the color of the monochromatic camouflage film coating or the multicolor camouflage film coating is adapted to the surrounding environment.

[0019] Specifically: The camouflage pattern of the monochromatic or polychromatic camouflage film coating of the present invention is determined as follows: 1) Conduct background reconnaissance; 2) Select a monochromatic or polychromatic camouflage design. Select the dominant color in the background that is closest to the average brightness as the monochromatic camouflage color, or use the dominant color as the intermediate color of the polychromatic deformed camouflage, and then select bright and dark differential colors according to the requirement that the brightness contrast between different color camouflage patches is greater than 0.2; 3) Draw the camouflage pattern according to monochromatic color painting or according to the principles of the shape and configuration of polychromatic spots.

[0020] The monochromatic camouflage film coating or polychromatic camouflage film coating of the present invention is coated on one or both sides of a fiberglass plain cloth or a fiberglass plain cloth polymer film; the thickness of the monochromatic camouflage film coating is greater than the thickness of the polychromatic camouflage film coating; further, the thickness of each coating is 15 - 25 μm, preferably 20 μm; the monochromatic camouflage film coating is coated six times and the thickness is 90 - 150 μm, preferably 120 μm; the polychromatic camouflage film coating is coated three times and the thickness is 45 - 75 μm, preferably 60 μm.

[0021] The ultrafine particle camouflage pigment of the present invention includes one or more of carbon black, titanium white, cadmium yellow, and cobalt blue, and the particle size of the ultrafine particle camouflage pigment is not greater than 6 μm.

[0022] The one-way wave transmission rate (power transmission coefficient) of the monochromatic or polychromatic camouflage film coating of the present invention within the radar operating band is not less than 85%; the optical countermeasure band of the monochromatic or polychromatic camouflage film coating is 0.3 - 1.2 μm.

[0023] The above-mentioned camouflage coating is composed of components such as resin (polytetrafluoroethylene resin), pigment, filler (thickener, etc.), and auxiliary agent. By selecting pigments and fillers, the spectral curve of the coating is adjusted according to the color matching principle to make the visible spectrum consistent with the background and simulate different background colors.

[0024] The present invention provides a preparation method for a polytetrafluoroethylene radome film coating with an optical camouflage function, including: Step 1: Sequentially add the polytetrafluoroethylene film coating solvent, pigment, and filler into the batching tank, stir and mix well, and sand and disperse them to a fineness of not greater than 6 μm by ball milling to prevent the phenomenon of roller scratching caused by one or more of the pigment particles of carbon black, titanium white, cadmium yellow, cobalt blue, etc. being too thick; Step 2: Gradually coat the polytetrafluoroethylene film coating solvent containing ultrafine particle camouflage pigments with a mass fraction of not less than 90% onto a plain woven fiberglass cloth or a plain woven fiberglass cloth polymer film, and the coating thickness is adjustable; among them, the monochromatic camouflage film coating is coated on the plain woven fiberglass cloth by a roller coating method, and the multicolor camouflage film coating is coated on the plain woven fiberglass cloth polymer film by a screen printing method; Step 3: Send it into a tunnel kiln for heating and curing, raise the temperature in stages to between 370 - 410 °C, and the curing time is 2 - 8 min. Example 1

[0025] Preparation of a multicolor polytetrafluoroethylene (PTFE) radome film coating with optical camouflage function: Using the ball milling method, select ultrafine particle titanium white and cadmium yellow pigments according to the environment; sequentially add the polytetrafluoroethylene (PTFE) film coating solvent, pigments, fillers, etc. into the batching tank, start high-speed stirring and mix well to prepare a polytetrafluoroethylene film coating solvent containing ultrafine particle camouflage pigments, and sand and disperse it to a fineness of not more than 6 μm. Using the screen printing method, gradually coat three layers of camouflage pigments on a plain woven fiberglass cloth polytetrafluoroethylene (PTFE) composite film, and the coating thickness is adjustable. According to the application requirements, the coating thickness can be selected from 19 - 21 μm. Coated by the screen printing method and heated and cured, according to the application requirements, the coating thickness can be selected as 60 μm. Send it into a tunnel kiln for heating and curing, raise the temperature in three stages to 400 °C, and the curing time is 6 min. Example 2

[0026] Preparation of a monochromatic polytetrafluoroethylene (PTFE) radome film coating with optical camouflage function: Using the ball milling method, select ultrafine particle cobalt blue pigment; sequentially add the polytetrafluoroethylene (PTFE) film coating solvent, pigments, fillers, etc. into the batching tank, start high-speed stirring and mix well to prepare ultrafine particle camouflage pigments, and sand and disperse the prepared slurry to a fineness of not more than 6 μm. Prepare polytetrafluoroethylene (PTFE) containing camouflage pigments with a mass fraction of not less than 90%, and use the roller coating method to gradually coat it onto a plain woven fiberglass cloth, with each coating thickness of 20 μm and 6 coatings, and the thickness is 120 μm. Send it into a tunnel kiln for heating and curing, raise the temperature in three stages to 400 °C, and the curing time is 6 min.

[0027] The advantages of the present invention are: The present invention coats a polytetrafluoroethylene (PTFE) radome thin film coating with optical camouflage function on a fiberglass plain cloth or a fiberglass plain cloth polymer film, which is used to construct facilities such as large radomes, and can effectively achieve the optical camouflage protection of the radome in the visible light and near-infrared bands; in addition, the present invention can realize the roll coating of the fiberglass polymer composite camouflage film material, save the later painting time and cumbersome auxiliary work, improve work efficiency, and meet the high-tech needs of the rapid development of the national defense industry.

[0028] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A polytetrafluoroethylene radar cover thin film coating with optical camouflage function, characterized in that: The coating is a single-color camouflage film coating or a multi-color camouflage film coating coated on a glass fiber plain weave cloth or a glass fiber plain weave cloth polymer film; wherein the single-color camouflage film coating is a polytetrafluoroethylene coating containing multiple layers of ultra-fine particle camouflage pigments, and the multi-color camouflage film coating is a polytetrafluoroethylene coating containing multiple layers of ultra-fine particle camouflage pigments, and the color of the single-color camouflage film coating or the multi-color camouflage film coating is adapted to the environment in which it is located.

2. The polytetrafluoroethylene radome thin film coating with optical camouflage function as claimed in claim 1, characterized in that: The single-color camouflage film coating or the multi-color camouflage film coating is coated on one side or both sides of the glass fiber plain weave cloth or the glass fiber plain weave cloth polymer film; the thickness of the single-color camouflage film coating is greater than the thickness of the multi-color camouflage film coating.

3. The polytetrafluoroethylene radome thin film coating with optical camouflage function as claimed in claim 2, characterized in that: The thickness of each coating is 15~25μm, the single-color camouflage film coating is applied with six coats and the thickness is 90~150μm, and the multi-color camouflage film coating is applied with three coats and the thickness is 45~75μm.

4. The polytetrafluoroethylene radome thin film coating with optical camouflage function as claimed in claim 1, characterized in that: The ultrafine particle camouflage pigment includes one or more of carbon black, titanium white, cadmium yellow and cobalt blue, and the particle size of the ultrafine particle camouflage pigment is not greater than 6 μm.

5. The polytetrafluoroethylene radome thin film coating with optical camouflage function as claimed in claim 1, characterized in that: Through background investigation, select the dominant color in the background that is closest to the average brightness as the single-color camouflage color; or, use the dominant color as the intermediate color of the multi-color deformed camouflage, and then select light and dark difference colors based on the requirement that the brightness contrast between camouflage patches of different colors is greater than 0.

2.

6. The polytetrafluoroethylene radome thin film coating with optical camouflage function as claimed in claim 1, characterized in that: The one-way wave transmittance of the single-color or multi-color camouflage film coating within the radar operating band shall not be less than 85%.

7. The polytetrafluoroethylene radome thin film coating with optical camouflage function as claimed in claim 1, characterized in that: The optical countermeasure band of single-color or multi-color camouflage film coating is 0.3~1.2μm.

8. A method for preparing a polytetrafluoroethylene radome thin film coating with optical camouflage function as claimed in any one of claims 1 to 7, characterized in that: include: Step 1, add polytetrafluoroethylene film coating solvent, pigment and filler into the mixing tank in sequence, stir and mix evenly, and sand grind and disperse to a fineness of no more than 6 μm; Step 2, gradually coating a polytetrafluoroethylene film coating solvent containing ultrafine particle camouflage pigments in an amount of not less than 90% by mass onto the glass fiber plain weave cloth or the glass fiber plain weave cloth polymer film; Step 3: Send it into the tunnel kiln for heating and curing, raising the temperature to between 370-410°C in stages, and the curing time is 2-8 minutes.

9. The preparation method according to claim 8, characterized in that: In the step 1, a ball milling method is used to prepare a polytetrafluoroethylene film coating solvent containing ultrafine particle camouflage pigments.

10. The preparation method according to claim 8, characterized in that: In step 2, the single-color camouflage film coating is applied on the glass fiber plain cloth by roller coating, and the multi-color camouflage film coating is applied on the glass fiber plain cloth polymer film by screen printing.