Polytetrafluoroethylene radar cover film coating with optical camouflage function and preparation method

Abstract

The application discloses a polytetrafluoroethylene radar cover film coating with an optical camouflage function and a preparation method. The coating is a single-color or multi-color camouflage film coating coated on a glass fiber plain cloth or a glass fiber plain cloth polymer film. The single-color camouflage film coating is a polytetrafluoroethylene coating containing superfine particle camouflage pigments in multiple layers. The multi-color camouflage film coating is a polytetrafluoroethylene coating containing superfine particle camouflage pigments in multiple layers. The color of the single-color or multi-color camouflage film coating is matched with the environment. The polytetrafluoroethylene radar cover 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 large radar antenna covers and other facilities, so that the optical camouflage protection of the radar cover in the visible light and near-infrared wave bands can be effectively realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of camouflage protection technology, in particular to a polytetrafluoroethylene (PTFE) radar cover film coating with optical camouflage function and a preparation method. BACKGROUND

[0002] With the rapid development of modern detection technology, the survivability of important targets has been greatly threatened. Therefore, it is particularly important to improve the anti-detection capability of these important targets. Using stealth camouflage protection technology to protect ground targets has become an important means to improve their survivability in the future. Stealth camouflage technology, also known as target characteristic signal control technology, makes it difficult to be discovered and identified by controlling or reducing the characteristic signals of the target.

[0003] In recent years, polytetrafluoroethylene (PTFE) polymer film new materials have been gradually applied to ground radar antenna cover protection. This kind of material is a white or bright color film polymer composite material, which does not have the function of ground camouflage. Its main performance is as follows: 1) the optical characteristics of the white film structure applied to the radar antenna cover are obviously exposed, which is easy to be discovered by space reconnaissance, and brings great challenge to the survivability of radar protection; 2) the bright color polytetrafluoroethylene (PTFE) film polymer composite material has poor fusion with the background ground soil color or green background, and its dielectric properties affect the radar wave transmittance.

[0004] Therefore, it is of great significance to innovate the polytetrafluoroethylene (PTFE) radar cover film material, realize the spectral reflectance characteristics in the visible light and near infrared (0.38~1.2μm) wave band based on the background, form the ground color pattern on the target by controlling the color, eliminate or reduce the difference between the target and the background optical characteristics, reduce the target saliency, distort or segment the target outline, prevent detection, and not affect the radar wave transmittance in the use wave band. SUMMARY

[0005] In order to solve the problem that the existing polytetrafluoroethylene (PTFE) radar cover film coating does not have the function of optical camouflage, resulting in the decline of its survivability, the present application provides a polytetrafluoroethylene (PTFE) radar cover film coating with optical camouflage function and a preparation method.

[0006] The application discloses a polytetrafluoroethylene radar cover film coating with an optical camouflage function, the coating is a single-color camouflage film coating coated on a glass fiber plain cloth or a multi-color camouflage film coating coated on a glass fiber plain cloth polymer film, and the glass fiber plain cloth polymer film coated with the coating is directly used as a radar cover; wherein the single-color camouflage film coating is a polytetrafluoroethylene coating containing superfine particle camouflage pigments in multiple layers, the multi-color camouflage film coating is a polytetrafluoroethylene coating containing superfine particle camouflage pigments in multiple layers, and the color of the single-color camouflage film coating or the multi-color camouflage film coating is matched with the environment.

[0007] As a further improvement of the application, the single-color camouflage film coating is coated on one side or both sides of the glass fiber plain cloth or the multi-color camouflage film coating is coated on one side or both sides of the glass fiber plain cloth polymer film; the thickness of the single-color camouflage film coating is greater than that of the multi-color camouflage film coating.

[0008] As a further improvement of the application, the thickness of each coating layer is 15-25 mu m, preferably 20 mu m; the single-color camouflage film coating is coated in six layers and has a thickness of 90-150 mu m, preferably 120 mu m; and the multi-color camouflage film coating is coated in three layers and has a thickness of 45-75 mu m, preferably 60 mu m.

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

[0010] As a further improvement of the application, through background investigation, the dominant color closest to the average brightness in the background is selected as the single-color camouflage color; or the dominant color is used as the intermediate color of multi-color deformation camouflage, and then bright and dark different 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 application, the single-pass wave transmission rate (power transmission coefficient) of the single-color or multi-color camouflage film coating in the radar working wave band is not less than 85%.

[0012] As a further improvement of the application, the optical countermeasure wave band of the single-color or multi-color camouflage film coating is 0.3-1.2 mu m.

[0013] The application further discloses a preparation method of the polytetrafluoroethylene radar cover film coating with the optical camouflage function, which comprises the following steps:

[0014] Step 1, polytetrafluoroethylene film coating solvent, pigments and fillers are sequentially added into a batching tank, stirred and uniformly mixed, and sand-milled and dispersed to a fineness of not greater than 6 mu m;

[0015] Step 2, coating the polytetrafluoroethylene film coating solvent containing superfine particle camouflage pigments with a mass fraction of not less than 90% on the glass fiber plain cloth or glass fiber plain cloth polymer film in steps, and the coating thickness can be adjusted;

[0016] Step 3, sending into a tunnel kiln for heating and curing, and the temperature is raised to 370-410℃ in stages, and the curing time is 2-8min.

[0017] As a further improvement of the present application, in the step 1, the polytetrafluoroethylene film coating solvent containing superfine particle camouflage pigments is prepared by a ball milling method.

[0018] As a further improvement of the present application, in the step 2, the single-color camouflage film coating is coated by a roll coating method, and the multi-color camouflage film coating is coated by a silk screen printing method.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The present application coats the polytetrafluoroethylene (PTFE) radar cover film coating with optical camouflage function on the glass fiber plain cloth or glass fiber plain cloth polymer film, which is used for constructing large radar antenna cover facilities, and can effectively realize the optical camouflage protection of the radar cover in the visible light and near-infrared wave band. In addition, the present application can realize the roll coating of the glass fiber polymer composite camouflage film material, save the later coating time and tedious auxiliary work, improve the work efficiency, and meet the high-tech demand of the rapid development of the national defense industry. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0022] The present application is further described in detail as follows:

[0023] The present application provides a polytetrafluoroethylene radar cover film coating with optical camouflage function, which is a single-color camouflage film coating or a multi-color camouflage film coating coated on a glass fiber plain cloth or a glass fiber plain cloth polymer film, and the glass fiber plain cloth or the glass fiber plain cloth polymer film coated with the coating is directly used as a radar cover; wherein the single-color camouflage film coating is a multi-layer polytetrafluoroethylene coating containing superfine particle camouflage pigments, the multi-color camouflage film coating is a multi-layer polytetrafluoroethylene coating containing superfine particle camouflage pigments, and the color of the single-color camouflage film coating or the multi-color camouflage film coating is matched with the environment.

[0024] Specifically,

[0025] The camouflage pattern of the single-color or multi-color camouflage film coating of the present application is determined by the following methods:

[0026] 1) Background survey is conducted;

[0027] 2) Single-color or multi-color camouflage design is selected, the dominant color closest to the average brightness in the background is selected as the single-color camouflage color, or the dominant color is selected as the intermediate color of the multi-color deformation camouflage, and then bright and dark difference colors are selected according to the requirement that the brightness contrast between different color camouflage patches is greater than 0.2;

[0028] 3) The camouflage pattern is drawn according to the single-color coating or the principle of shape and configuration of multi-color patches.

[0029] The single-color camouflage film coating or the multi-color camouflage film coating of the present application is coated on one side or both sides of the glass fiber plain cloth or the glass fiber plain cloth polymer film; the thickness of the single-color camouflage film coating is greater than that of the multi-color camouflage film coating; further, the thickness of each coating layer is 15-25 μm, preferably 20 μm; the single-color camouflage film coating is coated with six layers and the thickness is 90-150 μm, preferably 120 μm; the multi-color camouflage film coating is coated with three layers and the thickness is 45-75 μm, preferably 60 μm.

[0030] The superfine particle camouflage pigment of the present application includes one or more of carbon black, titanium white, cadmium yellow and cobalt blue, and the particle size of the superfine particle camouflage pigment is not greater than 6 μm.

[0031] The single-pass wave transmittance (power transmission coefficient) of the single-color or multi-color camouflage film coating of the present application in the radar operating wave band is not less than 85%; and the optical countermeasure wave band of the single-color or multi-color camouflage film coating is 0.3-1.2 μm.

[0032] The above camouflage coating is composed of resin (polytetrafluoroethylene resin), pigment, filler (thickening agent, etc.), auxiliary agent and other components. By selecting the pigment and filler, the spectral curve of the coating is adjusted according to the color matching principle to make the visible spectrum consistent with the background, thereby simulating different background colors.

[0033] The application provides a preparation method of a polytetrafluoroethylene radar cover film coating with an optical camouflage function.

[0034] Step 1: polytetrafluoroethylene film coating solvent, pigment and filler are sequentially added into a batching tank, stirred and uniformly mixed, and dispersed to a fineness of no more than 6 μm by ball milling to prevent the phenomenon of roll scratching caused by too coarse particles of one or more of the pigments such as carbon black, titanium white, cadmium yellow and cobalt blue.

[0035] Step 2: polytetrafluoroethylene film coating solvent containing superfine particle camouflage pigment with a mass fraction of no less than 90% is gradually coated on glass fiber plain cloth or glass fiber plain cloth polymer film, and the coating thickness can be adjusted; wherein the single-color camouflage film coating is coated on the glass fiber plain cloth by roll coating, and the multi-color camouflage film coating is coated on the glass fiber plain cloth polymer film by screen printing.

[0036] Step 3: sent into a tunnel kiln for heating and curing, and the temperature is raised to 370-410 ℃ in stages, and the curing time is 2-8 min. Example 1

[0037] Preparation of a multi-color polytetrafluoroethylene (PTFE) radar cover film coating with an optical camouflage function:

[0038] The superfine particle titanium white and cadmium yellow pigments are selected according to the environment, the polytetrafluoroethylene (PTFE) film coating solvent, pigment, filler and the like are sequentially added into a batching tank and stirred at high speed to prepare polytetrafluoroethylene film coating solvent containing superfine particle camouflage pigment and dispersed to a fineness of no more than 6 μm by ball milling. The three layers of camouflage pigments are gradually coated on the glass fiber plain cloth polytetrafluoroethylene (PTFE) composite film by screen printing, and the coating thickness can be adjusted. According to the requirements of the application, the coating thickness can be selected to be 19-21 μm. The coating is cured by heating and screen printing, and the coating thickness can be selected to be 60 μm according to the requirements of the application. The coating is sent into a tunnel kiln for heating and curing, and the temperature is raised to 400 ℃ in three stages, and the curing time is 6 min. Example 2

[0039] Preparation of a single-color polytetrafluoroethylene (PTFE) radar cover film coating with an optical camouflage function:

[0040] The ball milling method is adopted, the superfine particle cobalt blue pigment is selected, the polytetrafluoroethylene (PTFE) film coating solvent, the pigment, the filler and the like are sequentially added into a batching tank and are stirred uniformly under high speed, the superfine particle camouflage pigment is prepared, the prepared material slurry is sand-milled and dispersed to a fineness of no more than 6 mu m. The polytetrafluoroethylene (PTFE) containing the camouflage pigment with a mass fraction of no less than 90 % is prepared, the rolling coating method is adopted, and the polytetrafluoroethylene (PTFE) is gradually coated on the glass fiber plain cloth, the coating thickness of each coating is 20 mu m, the coating is performed for 6 times, and the thickness is 120 mu m. The glass fiber plain cloth is sent into a tunnel kiln for heating and curing, the temperature is raised to 400 DEG C in three stages, and the curing time is 6 min.

[0041] The advantages of the present application are:

[0042] The present application coats the polytetrafluoroethylene (PTFE) radar cover film coating with the optical camouflage function on the glass fiber plain cloth or the glass fiber plain cloth polymer film, is used for constructing large radar antenna cover facilities, and can effectively realize the optical camouflage protection of the radar cover in the visible light and near infrared wave band. In addition, the present application can realize the roller coating of the glass fiber polymer composite camouflage film material, saves the later coating time and the tedious auxiliary work, improves the work efficiency, and meets the high-tech demand of the rapid development of the national defense industry.

[0043] The above only for the preferred embodiment of the present application, and does not limit the present application, for the person skilled in the art, the present application can have various changes and changes. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A radar cover film having an optical camouflage function, characterized by, The radar cover film is glass fiber plain cloth or glass fiber plain cloth polymer film; wherein, a single-color camouflage film coating or a multi-color camouflage film coating is coated on the glass fiber plain cloth or the glass fiber plain cloth polymer film, the single-color camouflage film coating is a multi-pass polytetrafluoroethylene coating containing superfine particle camouflage pigments, the multi-color camouflage film coating is a multi-pass polytetrafluoroethylene coating containing superfine particle camouflage pigments, and the color of the single-color camouflage film coating or the multi-color camouflage film coating is matched with the environment.

2. The radar cover film having an optical camouflage function according to claim 1, wherein, 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 cloth or the glass fiber plain cloth polymer film; the thickness of the single-color camouflage film coating is greater than that of the multi-color camouflage film coating.

3. The radar cover film having an optical camouflage function according to claim 2, wherein, The thickness of each coating is 15-25 μm, the single-color camouflage film coating is coated with six passes and the thickness is 90-150 μm, and the multi-color camouflage film coating is coated with three passes and the thickness is 45-75 μm.

4. The radar cover film having an optical camouflage function according to claim 1, wherein, The superfine particle camouflage pigments include one or more of carbon black, titanium white, cadmium yellow and cobalt blue, and the particle size of the superfine particle camouflage pigments is not greater than 6 μm.

5. The radar cover film having an optical camouflage function according to claim 1, wherein Through background investigation, the dominant color closest to the average brightness in the background is selected as the single-color camouflage color; or the dominant color is selected as the intermediate color of multi-color deformation camouflage, and then bright and dark different colors are selected according to the requirement that the brightness contrast between different color camouflage patches is greater than 0.

2.

6. The radar cover film having an optical camouflage function according to claim 1, wherein, The single-pass wave transmittance of the single-color or multi-color camouflage film coating in the radar working wave band is not less than 85%.

7. The radar cover film having an optical camouflage function according to claim 1, wherein The optical countermeasure wave band of the single-color or multi-color camouflage film coating is 0.3-1.2 μm.