A microwave protection transparent dielectric material and its preparation method and application

Abstract

The present invention relates to the field of microwave protection technology, and in particular to a microwave protection transparent dielectric material and a preparation method thereof. The microwave protection transparent dielectric material developed by the present invention adopts a multi-layer film system to optimize the structure and thickness of the conductive layer, which not only effectively solves the contradiction between microwave protection performance and visible light transmittance, but also significantly improves the shielding performance compared with ordinary single-layer coating materials, and the protection frequency band is also significantly widened to a wide frequency range of 400MHz to 18GHz. In the range of 400MHz to 3GHz, the average shielding effectiveness SE>10dB, and in the frequency range of 3GHz to 18GHz, the average shielding effectiveness SE>14dB; in the specific microwave weapon operating frequency bandwidth (within the typical microwave weapon operating frequency bandwidth in the L, S, C, and X bands), the average shielding effectiveness SE>18dB; the visible light peak transmittance is ≥50%.

Description

Technical Field

[0001] The present invention relates to the field of microwave protection technology, and in particular to a microwave protection transparent dielectric material and a preparation method and application thereof. Background Art

[0002] At present, microwave technology is being used more and more widely, such as radar, satellite communication, microwave communication, microwave testing and telemetry, etc., all of which belong to the microwave range, and microwave radiation can cause different degrees of damage to human eyes, such as retinal detachment, cataracts, etc. Therefore, in order to protect the eyes from damage by microwave radiation, a kind of microwave radiation-proof eyeglass lens has been developed, which has a shielding film layer on the lens, but there is a problem that microwave protection performance and visible light transmission performance cannot be taken into account at the same time. Summary of the invention

[0003] The object of the present invention is to provide a microwave protection transparent dielectric material and a preparation method and application thereof. The microwave protection transparent dielectric material provided by the present invention has both good microwave protection performance and visible light transmission performance.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] The invention provides a microwave protection transparent dielectric material, comprising a polycarbonate substrate, a first titania matching layer, a first silver conductive layer, a second titania matching layer, a second silver conductive layer, a third titania matching layer, a third silver conductive layer, a fourth titania matching layer, an aluminum oxide bonding layer and a silicon dioxide wear-resistant layer which are stacked in sequence.

[0006] Preferably, the thickness of the first titania matching layer and the fourth titania matching layer is independently 30-50 nm, and the thickness of the second titania matching layer and the third titania matching layer is independently 60-80 nm.

[0007] Preferably, the thickness of the first silver conductive layer, the second silver conductive layer and the third silver conductive layer are independently 10-30 nm.

[0008] Preferably, the thickness of the aluminum oxide bonding layer is 50-70 nm.

[0009] Preferably, the thickness of the silicon dioxide wear-resistant layer is 90-110 nm.

[0010] Preferably, the thickness of the first titania matching layer is 37.01 nm, the thickness of the second titania matching layer is 73.01 nm, the thickness of the third titania matching layer is 71.82 nm, the thickness of the fourth titania matching layer is 37.65 nm, the thickness of the first silver conductive layer, the second silver conductive layer and the third silver conductive layer are all 20 nm, the thickness of the aluminum oxide bonding layer is 60 nm, and the thickness of the silicon dioxide wear-resistant layer is 99.8 nm.

[0011] The present invention also provides a method for preparing the microwave protective transparent dielectric material described in the above technical solution, comprising the following steps:

[0012] Titanium pentoxide particles and silver particles are respectively plated on the surface of the polycarbonate substrate to form a first titanium pentoxide matching layer, a first silver conductive layer, a second titanium pentoxide matching layer, a second silver conductive layer, a third titanium pentoxide matching layer, a third silver conductive layer, and a fourth titanium pentoxide matching layer in sequence;

[0013] Aluminum oxide particles are used to coat the surface of the fourth titanium oxide matching layer to form an aluminum oxide bonding layer;

[0014] The surface of the aluminum oxide bonding layer is coated with silicon dioxide to form a silicon dioxide wear-resistant layer, thereby obtaining the microwave protection transparent medium material.

[0015] Preferably, the particle size of the titanium pentoxide particles is 2 to 4 mm.

[0016] Preferably, the particle size of the silver particles is 3 to 6 mm.

[0017] The present invention also provides the use of the microwave protection transparent medium material described in the above technical solution in the preparation of microwave protection glasses.

[0018] The present invention provides a microwave protection transparent dielectric material, comprising a polycarbonate substrate, a first titanium pentoxide matching layer, a first silver conductive layer, a second titanium pentoxide matching layer, a second silver conductive layer, a third titanium pentoxide matching layer, a third silver conductive layer, a fourth titanium pentoxide matching layer, an aluminum oxide bonding layer and a silicon dioxide wear-resistant layer, which are stacked in sequence. The present invention adopts a multi-layer film system to optimize the structure and thickness of the conductive layer to develop a microwave protection transparent dielectric material. The film system adopts three induced transmission filters (each induced filter is composed of a high refractive index matching layer, a conductive silver layer and a high refractive index matching layer) connected in series, and combined with an aluminum oxide bonding layer and a silicon dioxide wear-resistant layer, which not only effectively solves the problem of microwave protection performance and reliability. The contradiction between visible light transmittance is not only significantly improved compared with ordinary single-layer coating materials in shielding performance, but the protection frequency band is also significantly widened to a wide frequency band of 400MHz to 18GHz. In the range of 400MHz to 3GHz, the average shielding effectiveness SE>10dB, and in the frequency range of 3GHz to 18GHz, the average shielding effectiveness SE>14dB; in the specific microwave weapon operating frequency bandwidth (within the typical microwave weapon operating frequency bandwidth in the L, S, C, and X bands), the average shielding effectiveness SE>18dB; the visible light peak transmittance is ≥50%, the vertical and horizontal monocular field of view is not less than 40, the surface haze of the microwave protection lens does not exceed 2.0%, the top focal length of the protection lens meets the requirements of GB 10810 and has eye protection functions such as infrared and ultraviolet protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the microwave protection transparent dielectric material of the present invention, wherein 1 is a first titanium pentoxide matching layer, 2 is a first silver conductive layer, 3 is a second titanium pentoxide matching layer, 4 is a second silver conductive layer, 5 is a third titanium pentoxide matching layer, 6 is a third silver conductive layer, 7 is a fourth titanium pentoxide matching layer, 8 is an aluminum oxide bonding layer, 9 is a silicon dioxide wear-resistant layer, and 10 is a polycarbonate substrate;

[0020] Figure 2 This is the visible light peak transmittance curve of the film system of the microwave protection transparent dielectric material prepared in Example 1 except for the polycarbonate substrate. DETAILED DESCRIPTION

[0021] The invention provides a microwave protection transparent dielectric material, comprising a polycarbonate substrate, a first titania matching layer, a first silver conductive layer, a second titania matching layer, a second silver conductive layer, a third titania matching layer, a third silver conductive layer, a fourth titania matching layer, an aluminum oxide bonding layer and a silicon dioxide wear-resistant layer which are stacked in sequence. Figure 1Schematic diagram of the structure of the microwave protection transparent dielectric material of the present invention, wherein 1 is a first titania matching layer, 2 is a first silver conductive layer, 3 is a second titania matching layer, 4 is a second silver conductive layer, 5 is a third titania matching layer, 6 is a third silver conductive layer, 7 is a fourth titania matching layer, 8 is an aluminum oxide bonding layer, 9 is a silicon dioxide wear-resistant layer, and 10 is a polycarbonate substrate.

[0022] In the present invention, the thickness of the first titania matching layer and the fourth titania matching layer are independently preferably 30-50 nm, and the thickness of the second titania matching layer and the third titania matching layer are independently preferably 60-80 nm.

[0023] In the present invention, the thickness of the first silver conductive layer, the second silver conductive layer and the third silver conductive layer are independently preferably 10 to 30 nm.

[0024] In the present invention, the thickness of the aluminum oxide bonding layer is preferably 50 to 70 nm.

[0025] In the present invention, the thickness of the silicon dioxide wear-resistant layer is preferably 90 to 110 nm.

[0026] In the present invention, the thickness of the polycarbonate substrate is preferably 2 mm. The present invention has no particular limitation on the source of the polycarbonate substrate.

[0027] In the present invention, the thickness of the first titania matching layer is preferably 37.01 nm, the thickness of the second titania matching layer is preferably 73.01 nm, the thickness of the third titania matching layer is preferably 71.82 nm, the thickness of the fourth titania matching layer is preferably 37.65 nm, the thickness of the first silver conductive layer, the second silver conductive layer and the third silver conductive layer are preferably 20 nm, the thickness of the aluminum oxide bonding layer is preferably 60 nm, and the thickness of the silicon dioxide wear-resistant layer is preferably 99.8 nm.

[0028] The present invention also provides a method for preparing the microwave protective transparent dielectric material described in the above technical solution, comprising the following steps:

[0029] Titanium pentoxide particles and silver particles are respectively plated on the surface of the polycarbonate substrate to form a first titanium pentoxide matching layer, a first silver conductive layer, a second titanium pentoxide matching layer, a second silver conductive layer, a third titanium pentoxide matching layer, a third silver conductive layer, and a fourth titanium pentoxide matching layer in sequence;

[0030] Aluminum oxide particles are used to coat the surface of the fourth titanium oxide matching layer to form an aluminum oxide bonding layer;

[0031] The surface of the aluminum oxide bonding layer is coated with silicon dioxide to form a silicon dioxide wear-resistant layer, thereby obtaining the microwave protection transparent medium material.

[0032] In the present invention, the particle size of the titanium pentoxide particles is preferably 2 to 4 mm.

[0033] In the present invention, the particle size of the silver particles is preferably 3 to 6 mm.

[0034] In the present invention, the particle size of the aluminum oxide particles is preferably 2 to 5 mm.

[0035] The present invention has no particular limitation on the specific operation of the coating, and a method well known to those skilled in the art may be used.

[0036] The present invention also provides the use of the microwave protection transparent medium material described in the above technical solution in the preparation of microwave protection glasses.

[0037] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1

[0039] Coating material selection

[0040] The first titania matching layer, the second titania matching layer, the third titania matching layer, and the fourth titania matching layer are made of Ti in titanium oxide. 3 O 5 , granular, size 2-4 mm, purity 99.9%;

[0041] The first silver conductive layer, the second silver conductive layer and the third silver conductive layer are made of silver particles with a size of 3 to 6 mm and a purity of 99.99%;

[0042] The bonding layer is made of Al 2 O 3 , granular, size 2 to 5 mm, purity 99.9%.

[0043] Eyeglass lens base selection

[0044] The lenses are made of PC polycarbonate with a thickness of 2mm.

[0045] Preparation method:

[0046] Titanium pentoxide particles and silver particles are respectively plated on the surface of the polycarbonate substrate to form a first titanium pentoxide matching layer, a first silver conductive layer, a second titanium pentoxide matching layer, a second silver conductive layer, a third titanium pentoxide matching layer, a third silver conductive layer, and a fourth titanium pentoxide matching layer in sequence;

[0047] Aluminum oxide particles are used to coat the surface of the fourth titanium oxide matching layer to form an aluminum oxide bonding layer;

[0048] Silicon dioxide is coated on the surface of the aluminum oxide bonding layer to form a silicon dioxide wear-resistant layer, so as to obtain the microwave protection transparent medium material, i.e., microwave protection glasses, wherein the thickness of the first titanium oxide matching layer is preferably 37.01 nm, the thickness of the second titanium oxide matching layer is preferably 73.01 nm, the thickness of the third titanium oxide matching layer is preferably 71.82 nm, the thickness of the fourth titanium oxide matching layer is preferably 37.65 nm, the thickness of the first silver conductive layer, the second silver conductive layer and the third silver conductive layer are preferably 20 nm, the thickness of the aluminum oxide bonding layer is preferably 60 nm, and the thickness of the silicon dioxide wear-resistant layer is preferably 99.8 nm.

[0049] Product performance and quality control

[0050] During the development process, the product performance at each stage was tested in a timely manner, with an emphasis on controlling shielding performance and visible light peak transmittance.

[0051] The visible light peak transmittance of the film system except the polycarbonate substrate of the microwave protection transparent dielectric material prepared in this embodiment was tested. The results are as follows: Figure 2 As shown, it can be seen that the theoretical peak transmittance is >90%, and the visible light peak transmittance of the microwave protection transparent medium material prepared in this embodiment is 66.1%.

[0052] The shielding performance test results of the microwave protection transparent dielectric material prepared in this embodiment are shown in Tables 1 and 2, wherein Table 1 is the continuous wave shielding effectiveness test results, and Table 2 is the pulse microwave shielding effectiveness test results.

[0053] Table 1 Continuous wave shielding effectiveness test results

[0054] Frequency (Hz) Shielding effectiveness average value (dB) 5.00E+08 16.18 1.00E+09 28.76 2.00E+09 23.01 3.00E+09 21.87 4.00E+09 32.53 5.00E+09 26.19 6.00E+09 27.02 7.00E+09 28.86 8.00E+09 27.42 9.00E+09 29.83 1.00E+10 23.88 1.10E+10 25.46 1.20E+10 31.39 1.30E+10 22.76 1.40E+10 22.27 1.50E+10 23.66 Frequency range Frequency average shielding performance (dB) 400MHz~3GHz 21.73 3GHz~18GHz 26.91

[0055] Table 2 Pulse microwave shielding effectiveness test results

[0056]

[0057] After the microwave protection transparent dielectric material has been subjected to environmental tests such as high and low temperature (high temperature 55°C, 30 min, low temperature -18°C, 120 min), humidity, friction (manual cotton wool rubbing 500 times), salt spray (immersion in 5% salt water for 16 h), and impact, the shielding performance test results are shown in Tables 3 and 4.

[0058] Table 3 Test results of microwave protection transparent dielectric materials for continuous wave shielding effectiveness after comprehensive environmental testing

[0059] Frequency (Hz) Shielding effectiveness average value (dB) 5.00E+08 5.62 1.00E+09 11.27 2.00E+09 11.80 3.00E+09 15.10 4.00E+09 19.74 5.00E+09 20.23 6.00E+09 25.17 7.00E+09 20.42 8.00E+09 25.28 9.00E+09 22.43 1.00E+10 24.07 1.10E+10 21.71 1.20E+10 29.95 1.30E+10 23.72 1.40E+10 18.05 1.50E+10 23.95 Frequency range Frequency average shielding performance (dB) 400MHz~3GHz 10.54 3GHz~18GHz 22.83

[0060] Table 4 Test results of microwave protection transparent dielectric materials against pulse microwave shielding effectiveness after comprehensive environmental tests

[0061]

[0062] Other properties of microwave protective transparent dielectric materials have been tested by the National Eyewear Product Quality Inspection Center, and all properties are qualified. It also has anti-ultraviolet and anti-infrared properties, as well as protection against lasers with wavelengths of 808nm, 905nm, 940nm, 980nm, 1064nm, and 10600nm.

[0063] The performances are as follows:

[0064] The monocular vision lens has a horizontal distance of 64mm, a major axis of 40mm, and a minor axis of 28mm. The converted visual field index is >45°;

[0065] Vertex power 0.01~0.03;

[0066] Impact-resistant JXUB-2011, no breakage;

[0067] The anti-friction haze value is 0.04%;

[0068] Surface quality and internal flawlessness.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A microwave protection transparent dielectric material, characterized in that: Specifically, a polycarbonate substrate, a first titania matching layer, a first silver conductive layer, a second titania matching layer, a second silver conductive layer, a third titania matching layer, a third silver conductive layer, a fourth titania matching layer, an aluminum oxide bonding layer and a silicon dioxide wear-resistant layer are stacked in sequence; The thickness of the first titania matching layer and the fourth titania matching layer are independently 30-50 nm, and the thickness of the second titania matching layer and the third titania matching layer are independently 60-80 nm; The thickness of the first silver conductive layer, the second silver conductive layer and the third silver conductive layer are independently 10 to 30 nm; The thickness of the aluminum oxide bonding layer is 50-70 nm.

2. The microwave-protective transparent dielectric material according to claim 1, characterized in that: The thickness of the silicon dioxide wear-resistant layer is 90-110 nm.

3. The microwave-protective transparent dielectric material according to claim 1, characterized in that: The thickness of the first titania matching layer is 37.01 nm, the thickness of the second titania matching layer is 73.01 nm, the thickness of the third titania matching layer is 71.82 nm, the thickness of the fourth titania matching layer is 37.65 nm, the thickness of the first silver conductive layer, the second silver conductive layer and the third silver conductive layer are all 20 nm, the thickness of the aluminum oxide bonding layer is 60 nm, and the thickness of the silicon dioxide wear-resistant layer is 99.8 nm.

4. The method for preparing the microwave protective transparent dielectric material according to any one of claims 1 to 3, characterized in that: The following steps are involved: Titanium pentoxide particles and silver particles are respectively plated on the surface of the polycarbonate substrate to form a first titanium pentoxide matching layer, a first silver conductive layer, a second titanium pentoxide matching layer, a second silver conductive layer, a third titanium pentoxide matching layer, a third silver conductive layer, and a fourth titanium pentoxide matching layer in sequence; Aluminum oxide particles are used to coat the surface of the fourth titanium oxide matching layer to form an aluminum oxide bonding layer; The surface of the aluminum oxide bonding layer is coated with silicon dioxide to form a silicon dioxide wear-resistant layer, thereby obtaining the microwave protection transparent medium material.

5. The preparation method according to claim 4, characterized in that: The particle size of the titanium pentoxide particles is 2-4 mm.

6. The preparation method according to claim 4, characterized in that: The particle size of the silver particles is 3-6 mm.

7. Use of the microwave protective transparent dielectric material according to any one of claims 1 to 3 in the preparation of microwave protective glasses.

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