CN109807037B - Protection method for exposed electrode of optical shielding window - Google Patents
Protection method for exposed electrode of optical shielding window Download PDFInfo
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- CN109807037B CN109807037B CN201910037286.3A CN201910037286A CN109807037B CN 109807037 B CN109807037 B CN 109807037B CN 201910037286 A CN201910037286 A CN 201910037286A CN 109807037 B CN109807037 B CN 109807037B
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Abstract
The invention provides a protection method for an exposed electrode of an optical shielding window, aiming at the defects of the existing protection method, the invention selects a high-molecular elastic material-silicon rubber with good high temperature resistance, cold resistance and aging resistance as an electrode protection material, dilutes the silicon rubber through an organic solvent, adopts the process methods of shielding before spraying and spraying the silicon rubber to spray and cover the exposed electrode on the surface of the optical shielding window, and forms an electrode protection layer after the silicon rubber is completely cured, thereby not only meeting the requirement of the aesthetic property of the product, but also meeting the environmental adaptability requirements of high and low temperature resistance, strong airflow, sand dust and the like of the exposed electrode under the flight working condition on the premise of not influencing the shielding property and the optical property of the optical window. The problems of poor reliability and easy falling of exposed electrodes in other protection materials and methods are solved.
Description
Technical Field
The invention belongs to the field of optical machine assembly and spraying, and particularly relates to a protection method for an exposed electrode of an optical shielding window.
Background
The optical window is an important component of an airborne optoelectronic system, and in order to ensure the RCS performance of the aircraft, the optical window needs to have good electromagnetic shielding capability while having good optical, mechanical and thermal properties. In order to shield the optical window, a conductive metal mesh grid with an electromagnetic shielding function is manufactured on the surface of the optical window to realize metallization of the optical window, and then a high-strength protective film is plated on the metal mesh grid. Due to the limitation of the coating process, the conductive metal mesh grid cannot be completely covered, so that the electrode at the edge of the window of the optical window is exposed, and in order to prevent the electrode from falling off in severe environments such as sand dust and the like in the flying process, the electrode must be reliably protected, and the reduction of the electromagnetic shielding performance caused by the breakage of the electrode is avoided.
Currently available protective coatings for metal electrodes and conductive films are acrylic based coatings and epoxy primer coatings. For example, the protective coating for the nano silver conductive film is a resin coating which takes methyl methacrylate as a main raw material, and a protective layer similar to transparent organic glass is formed on the surface of the protective coating, so that the defects of easy scratching, poor environment resistance and the like of the conductive film can be prevented. The epoxy resin primer coating can be used for protecting a metal electrode by adopting a spraying mode, has salt fog resistance, humidity resistance and mechanical properties, and has better adhesive force to the metal electrode.
The optical shielding window is an optical window with a special use function, and the metalized optical shielding window is only used on airplanes with key model items in certain countries in China at present. The high-strength protective film is plated on the other parts except the electrodes on the periphery of the optical window. Because the electrode is directly exposed outside, in order to meet the use requirement, the electrode must be reinforced and protected, and the damage of scratching and the like of the electrode caused by sand dust is prevented. Because the use environment is severe, the product needs to be subjected to long-time ultraviolet irradiation, multiple frequency temperature difference impact of minus 55 ℃ to plus 150 ℃ and the pneumatic performance of various flight working conditions. The applicant used the above acrylic resin paint and zinc yellow epoxy primer for spray protection of electrodes, but the protective layer was still prone to fall off during the actual use of the product, and the main reason for this analysis is that the acrylic resin and epoxy primer are both resin materials, which are hard and brittle, have low elasticity and poor weather resistance, and are prone to break under ultraviolet irradiation, and have a large difference in thermal expansion coefficient from the optical substrate material, and as the external temperature difference repeatedly alternates many times during the flight process, the adhesion is reduced, and local peeling phenomenon gradually occurs, especially when the optical window is made of crystalline material, the crystalline grains of the substrate often fall off while the epoxy protective layer falls off, causing damage to the substrate at the edge of the optical window surface. Therefore, the existing protection method is not suitable for protecting the metal electrode of the optical shielding window.
No other documents and patent reports are found for the protection of the exposed electrodes on the optical window. Therefore, a protection material suitable for the optical window electrode and a feasible protection process are needed, which can meet the functional requirements of products and the environmental adaptability requirements of high and low temperature resistance, sand dust resistance and the like under the flight working condition.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for protecting an exposed electrode of an optical shielding window, which comprises the steps of selecting a high-molecular elastic material-silicon rubber with good high temperature resistance, cold resistance and aging resistance as an electrode protection material, diluting the silicon rubber by an organic solvent, spraying and covering the exposed electrode on the surface of the optical window by adopting a spraying process method, and forming an electrode protection layer after the silicon rubber is completely cured.
The technical scheme of the invention is as follows:
the protection method for the exposed electrode of the optical shielding window is characterized by comprising the following steps: the method comprises the following steps:
step 1: shielding a non-metal electrode area of the optical shielding window and a shell provided with the optical shielding window;
step 2: diluting the silicone rubber: respectively weighing the silicon rubber and the dimethylbenzene according to the mass ratio of 2: 1 of the silicon rubber and the dimethylbenzene, wherein the weighing error is not more than +/-5%; mixing silicon rubber and dimethylbenzene in a vessel, and uniformly stirring;
and step 3: wiping the exposed electrode of the optical shielding window; placing the shell with the optical shielding window on a spraying operation table;
and 4, step 4: putting the diluted silicon rubber spray gun in the step 2 into a spray can and assembling
The caliber nozzle is used for adjusting the air pressure of the spray gun to ensure that the sprayed silicon rubber is in a atomized state;
and 5: controlling the distance between a nozzle of the spray gun and the sprayed electrode, and continuously spraying for one circle along the electrode; after spraying for at least two times, placing the mixture in an environment with the temperature of 60 +/-5 ℃ and drying the mixture for at least 30 min; continuously spraying for at least two times, drying for at least 2h in an environment with the temperature of 60 +/-5 ℃, and then curing for at least 8h at normal temperature;
step 6: and (3) after the silicon rubber is completely cured, removing the shielding material in the step (1), and cleaning the surface of the optical shielding window.
In a further preferred aspect, the method for protecting an exposed electrode of an optical shielding window is characterized in that: the specific process of shielding the non-metal electrode area of the optical shielding window and the shell provided with the optical shielding window in the step 1 is as follows: adopting a non-adhesive tape to adhere and cover the non-electrode area of the optical window, adopting a non-adhesive tape or masking paper to adhere and cover the shell provided with the optical shielding window, and only reserving the electrode area to be coated; the adhesive tape is compressed to ensure that the adhesive tape is seamless; the gaps between the adhesive tapes are sealed by shellac paint.
In a further preferred aspect, the method for protecting an exposed electrode of an optical shielding window is characterized in that: and 3, dipping absorbent cotton in the mixed solution of alcohol and ether to wipe the exposed electrode clean, and removing oil stains, sweat stains or foreign matters on the electrode.
In a further preferred aspect, the method for protecting an exposed electrode of an optical shielding window is characterized in that: the volume ratio of the alcohol ethyl ether in the step 3 is 7: 3.
In a further preferred aspect, the method for protecting an exposed electrode of an optical shielding window is characterized in that: and 6, removing the masking material in the step 1, and wiping off residual shellac paint on the surface by using alcohol.
Advantageous effects
The beneficial effects of the invention are shown in the following aspects:
(1) the silicon rubber coating is used for protecting the electrode, compared with other epoxy materials, the silicon rubber has excellent ozone resistance and aging resistance, can be used under ultraviolet rays and other climatic severe weather conditions for a long time, and has a good protection effect on an optical shielding window used under outdoor conditions for a long time.
(2) The silicon rubber coating is used for protecting the electrode, compared with other epoxy materials, the silicon rubber has high cold resistance and heat resistance, has a wide temperature application range of minus 70 ℃ to plus 250 ℃, has a good protection effect on an optical shielding window used for multiple times under the condition of high and low temperature and large temperature difference change, and has elastic performance which can make up the difference of expansion coefficients of different materials under large temperature difference and avoid damage to optical materials of a base.
(3) The silicon rubber coating is used for protecting the electrode, the silicon rubber has strong adhesive force with the electrode, is not easy to fall off, and can meet the use requirements of an optical shielding window on wind resistance, wind power and the like under various flight working conditions of an airplane.
(4) According to the invention, the xylene is adopted to dilute the silicone rubber, and the proper dilution ratio is selected to dilute the viscous silicone rubber to the viscosity suitable for the spraying requirement, so that the spraying requirement is met.
(5) Compared with the traditional coating process method, the silicon rubber layer has better uniformity and aesthetic property and higher thickness dimension accuracy.
(6) The invention uses the adhesive-free adhesive tape to cover the part which does not need to be coated, and no residual adhesive is left after the adhesive-free adhesive tape is removed. In order to prevent the permeation of the silicon rubber of the lap joint gap, the gap of the adhesive tape is connected and filled with the protective liquid, namely the shellac paint, so that the permeation of the covered gap in the spraying process can be prevented, the optical glass cannot be corroded or damaged, and the adhesive tape can be easily cleaned by alcohol.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view of an optical shielding window, which includes an exposed electrode 1, a metal mesh 2, a high-strength protective film 3, an antireflection film 4, and an optical window 5.
Fig. 2 is a schematic diagram of the optical shielding window after assembly, which includes an exposed electrode 1, a metal mesh 2, an optical window 5, and a metal housing 6.
Fig. 3 is a schematic diagram after spraying and covering, which includes an exposed electrode 1, shellac paint 7, protective tape 8 on the optical window, and protective tape 9 on the housing.
Fig. 4 is a schematic view of the surface of the optical window after being protected by the silicone rubber coating, which includes the optical window 5, the metal shell 6, and the silicone rubber spray coating 10.
Detailed Description
The following detailed description of embodiments of the invention is intended to be illustrative, and not to be construed as limiting the invention.
The optical shielding window of the preferred embodiment of the invention has the appearance shown in figure 1, is an irregular wedge-shaped optical part and consists of optical glass, a gold wire mesh, edge and side edge metal electrodes, an inner surface antireflection film and an outer surface strength protection film.
Fig. 2 is a schematic view of the assembly of the optical shielding window to the metal housing, wherein the metal housing and the metalized optical window are in wedge-shaped fit and are fastened by an elastic collar. The metal mesh grid plated on the outer surface of the optical window is connected with the edge and side electrodes, the optical window is matched with the metal shell through a wedge surface, and conductive adhesive is uniformly coated on the wedge-shaped matching section to realize the electric conduction of the optical metal electrode and the metal shell. Because the exposed electrode is positioned at the edge of the window, the surface of the exposed electrode is not protected by a high-strength protective film due to the limitation of the prior art, and if other protective measures are not taken, the falling of the exposed electrode on the outer surface can cause the continuity of the electrical conduction between the metallized optical glass and the shell, thereby influencing the shielding performance of the product.
The invention selects the high-molecular elastic material-silicon rubber with good high temperature resistance, cold resistance and aging resistance as the electrode protection material, dilutes the silicon rubber by an organic solvent, adopts a spraying process method to spray and cover the exposed electrode on the surface of the optical window, and forms an electrode protection layer after the silicon rubber is completely cured. The invention relates to a protection method suitable for an exposed electrode of an optical shielding window, which can meet the functional requirements of products and the environmental adaptability requirements of high and low temperature resistance, sand dust resistance and the like under the flight working condition.
The method comprises the following specific steps:
step 1: and shielding the non-metal electrode area. As shown in fig. 3, the non-metal electrode area of the optical window is covered by adhesive-free tape, and the housing provided with the optical window is covered by adhesive-free tape or masking paper, so that only the metal electrode is left, the adhesive tape is compressed, and the adhesion is seamless. The gaps between the adhesive tapes are sealed by shellac paint. And protecting the places which do not need to be sprayed with the interior by using protective soft paper and textured paper.
Step 2: the silicone rubber was diluted. According to the mass ratio of the silicon rubber to the dimethylbenzene of 2: 1, the silicon rubber and the dimethylbenzene are respectively weighed, the weighing error is not more than +/-5 percent, and the two components are mixed in a metal vessel and stirred uniformly.
And step 3: the exposed metal electrode is wiped clean by absorbent cotton dipped with a mixed solution of alcohol and ether (the volume ratio of alcohol to ether is 7:3), and the electrode cannot have greasy dirt, sweat stains or foreign matters. Wiping the cotton to be half-dry, and preventing the mixed liquid from permeating into the protective adhesive tape. The shell with the optical shielding window is placed on a spraying operation table, the sprayed surface is in a horizontal state as much as possible, the inclination angle is less than or equal to 30 degrees, and a hand cannot touch the exposed electrode.
And 4, step 4: pouring the diluted silicon rubber solution obtained in the step 2 into a spray can of a PQ-1 type spray gun, wherein the using caliber is
The air pressure of the spray gun is adjusted against the test board, so that the sprayed silicon rubber is guaranteed to be in a atomized state.
And 5: the distance between the nozzle of the spray gun and the sprayed metal electrode is about 20cm, one circle of continuous spraying is carried out along the metal electrode, so that the silicon rubber is uniformly covered on the metal electrode, after two times of continuous spraying, the metal electrode is placed in a drying oven, the sprayed surface is in a horizontal state, the inclination angle is less than or equal to 30 degrees, and the metal electrode is dried for 30-60 min at 60 +/-5 ℃. And after two times of continuous spraying, placing the mixture in a drying oven to enable the sprayed surface to be in a horizontal state, enabling the inclined angle to be less than or equal to 30 degrees, drying the mixture for more than 2 hours at 60 +/-5 ℃, and then curing the mixture for more than 8 hours at normal temperature.
Step 6: after the silicone rubber is completely cured, removing the adhesive-free adhesive tape adhered to the non-spraying surface, and cutting and breaking the silicone rubber layer along the direction of the adhesive tape when the adhesive tape adhered to the electrode is torn off, so as to ensure neatness; and wiping off residual shellac paint on the surface of the optical window by using alcohol.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (4)
1. A protection method for an exposed electrode of an optical shielding window is characterized in that: the method comprises the following steps:
step 1: shielding a non-metal electrode area of the optical shielding window and a shell provided with the optical shielding window; adopting a non-adhesive tape to adhere and cover the non-electrode area of the optical window, adopting a non-adhesive tape or masking paper to adhere and cover the shell provided with the optical shielding window, and only reserving the electrode area to be coated; the adhesive tape is compressed to ensure that the adhesive tape is seamless; filling gaps between the adhesive tapes with shellac paint;
step 2: diluting the silicon rubber: respectively weighing the silicon rubber and the dimethylbenzene according to the mass ratio of 2: 1 of the silicon rubber and the dimethylbenzene, wherein the weighing error is not more than +/-5%; mixing silicon rubber and dimethylbenzene in a vessel, and uniformly stirring;
and step 3: wiping the exposed electrode of the optical shielding window; placing the shell with the optical shielding window on a spraying operation table;
and 4, step 4: putting the diluted silicon rubber spray gun in the step 2 into a spray can and assembling
The caliber nozzle is used for adjusting the air pressure of the spray gun to ensure that the sprayed silicon rubber is in a atomized state;
and 5: controlling the distance between a nozzle of the spray gun and the sprayed electrode, and continuously spraying for one circle along the electrode; after spraying for at least two times, placing the mixture in an environment with the temperature of 60 +/-5 ℃ and drying the mixture for at least 30 min; continuously spraying for at least two times, drying for at least 2h in an environment with the temperature of 60 +/-5 ℃, and then curing for at least 8h at normal temperature;
step 6: and (3) after the silicon rubber is completely cured, removing the shielding material in the step (1), and cleaning the surface of the optical shielding window.
2. The method of claim 1, wherein the step of protecting the exposed electrode of the optical shielding window comprises: and 3, dipping absorbent cotton in the mixed solution of alcohol and ether to wipe the exposed electrode clean, and removing oil stains, sweat stains or foreign matters on the electrode.
3. The method of claim 2, wherein the step of protecting the exposed electrode of the optical shielding window comprises: the volume ratio of the alcohol ethyl ether in the step 3 is 7: 3.
4. The method of claim 1, wherein the step of protecting the exposed electrode of the optical shielding window comprises: and 6, removing the masking material in the step 1, and wiping off residual shellac paint on the surface by using alcohol.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910037286.3A CN109807037B (en) | 2019-01-15 | 2019-01-15 | Protection method for exposed electrode of optical shielding window |
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| CN201910037286.3A CN109807037B (en) | 2019-01-15 | 2019-01-15 | Protection method for exposed electrode of optical shielding window |
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| CN109807037A CN109807037A (en) | 2019-05-28 |
| CN109807037B true CN109807037B (en) | 2022-03-15 |
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| CN110802521B (en) * | 2019-11-15 | 2021-08-31 | 贵州航天南海科技有限责任公司 | Local sand blasting method for part |
| CN111687016A (en) * | 2020-07-31 | 2020-09-22 | 广西玉柴机器股份有限公司 | Paint spraying and shielding method and tool for bearing surface of threaded hole of engine part |
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| CN104837326A (en) * | 2015-05-21 | 2015-08-12 | 哈尔滨工业大学 | Method for manufacturing electromagnetic shielding curved surface optical window with metal mesh structure |
| CN107913833A (en) * | 2017-11-28 | 2018-04-17 | 广东创瑜机电工程有限公司 | A kind of production method of novel electric control cabinet |
| CN109099832A (en) * | 2018-08-21 | 2018-12-28 | 华东理工大学 | Strain transducer and its manufacturing method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345285A (en) * | 2007-07-12 | 2009-01-14 | 天津市津南区凯达电子有限公司 | Low-power consumption magnetosensitive element for telemetering water meter and production technique thereof |
| CN104837326A (en) * | 2015-05-21 | 2015-08-12 | 哈尔滨工业大学 | Method for manufacturing electromagnetic shielding curved surface optical window with metal mesh structure |
| CN107913833A (en) * | 2017-11-28 | 2018-04-17 | 广东创瑜机电工程有限公司 | A kind of production method of novel electric control cabinet |
| CN109099832A (en) * | 2018-08-21 | 2018-12-28 | 华东理工大学 | Strain transducer and its manufacturing method |
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