Method for manufacturing local conductive pattern on hyperboloid glass

Abstract

Manufacturing of local conductive patterns on double-curved-surface glass has the problems of high process difficulty, high equipment requirement, poor adhesive force of a film layer on the glass and the like. Local conductive pattern processing can be completed on the double-curved-surface glass by utilizing existing photoetching equipment, silk-screen equipment and magnetron sputtering coating equipment which are used for processing on plane glass, and special photoetching equipment for processing curved-surface glass does not need to be input, so that the equipment input cost is greatly saved. The invention develops a production process for manufacturing a conductive pattern on double-curved-surface glass. The method can be realized by directly using traditional coating, screen printing and etching equipment without purchasing special and expensive curved surface photoetching equipment, so that the cost is saved, batch production can be realized, the production efficiency is high, a film layer is not easy to separate, and the reliability of a product is improved.

Description

Technical Field

[0001] The invention relates to the field of automobile touch display, and in particular to a method for making a local conductive pattern on a hyperbolic glass. Background Art

[0002] At present, the automotive industry is developing rapidly. The windshield, rear windshield and rearview mirror all need to use glass with hyperbolic conductive patterns for heating, electrochromic functions or decorative film layers. At present, the market mainly adopts flexible conductive film lamination solutions, and there is no direct conductive pattern on the hyperbolic glass.

[0003] The flexible conductive film lamination solution actually uses the photolithography process. First, the required conductive film layer is plated on the flexible film by magnetron sputtering, and then the required conductive pattern is produced by conventional photolithography. The flexible conductive pattern is then laminated on the curved glass to obtain the required curved conductive glass. This process has a simple production process and can also be mass-produced, but it has poor reliability and is prone to film separation.

[0004] Traditional photolithography equipment can only produce flat glass, and the photolithography process cannot produce curved glass. To produce curved glass, you need to use photoresist coating equipment and exposure equipment specially designed for the production of curved glass, which are expensive, have high investment costs, and have low production efficiency.

[0005] When using traditional photolithography technology for processing, conventional photolithography technology can only be performed on flat glass. At present, the existing manufacturing scheme for making conductive patterns on hyperbolic glass is to first make the conductive pattern on a flexible film and then attach the flexible film to the hyperbolic glass. This process has poor adhesion of the conductive film layer and is prone to delamination.

[0006] Disadvantages of existing technology: Flexible conductive film adopts lamination scheme: In fact, it still adopts photolithography process. First, the required conductive film layer is plated on the flexible film by magnetron sputtering, and then the required conductive pattern is produced by conventional photolithography process. Then the flexible conductive pattern is laminated on the curved glass to obtain the required curved conductive glass. This process is simple and can also be mass-produced, but the reliability is poor and the film layer is prone to separation.

[0007] Lithography process plan: Since it is curved glass, traditional lithography equipment (which can only produce flat glass) cannot be used. Therefore, special lithography coating equipment and exposure equipment for producing curved glass are required. After coating the curved glass, it is cleaned and coated with photoresist, and then exposed and developed using a mask plate to obtain a photoresist pattern identical to the mask plate. Further etching and stripping of the photoresist are carried out to obtain the required curved conductive pattern. This production process requires special curved production equipment, which is expensive and has a large input cost. Currently, this process flow is rarely used to produce curved glass on the market.

[0008] Other alternative solutions also follow the lithography process plan. Since patterns are processed on double-curved glass, special coating machines, exposure machines, etc. for curved surface processing need to be customized. These two precision devices are expensive and have a large input cost. Moreover, the production process needs to be explored again, resulting in low production efficiency. Summary of the Invention

[0009] The present invention aims to solve the problems that for the curved glass produced by the laminating method using a flexible conductive film, the adhesion of the flexible conductive pattern film layer is poor and it is easy to delaminate and separate; to solve the problem of the high cost of lithography on curved glass, which requires special lithography coating equipment and exposure equipment for producing curved glass; to solve the problem of low production efficiency of curved glass using the lithography process; to solve the problem of easy scratching during the cleaning of double-curved glass; to solve the problem of easy lamination during the cleaning of double-curved glass; to solve the problem that the screen plate is easy to break or the double-curved pattern is distorted when using a curved profiling squeegee.

[0010] To solve the above problems, the present application is achieved through the following technical solutions: A method for making a local conductive pattern on double-curved glass, comprising the following steps: S1. Cleaning: Ultrasonically cleaning, brushing with a brush, high-pressure spraying, air knife drying, and baking the double-curved glass to obtain a cleaned double-curved glass; S2. Coating: Coating the cleaned double-curved glass in step S1 with a metal target to obtain a double-curved glass with a conductive film layer; S3. Screen printing: Screen printing ink on the double-curved glass with a conductive film layer in step S2 using a squeegee and a screen plate, and then drying to obtain a double-curved glass printed with ink; S4. Etching first and then stripping: Etching the double-curved glass printed with ink in step S3, performing liquid knife cutting, high-pressure water washing, water spraying washing, air knife drying, and then stripping with a stripping solution to obtain a double-curved glass with a conductive pattern.

[0011] In step S1, the height H from the curved vertex of the double-curved glass to the plane cross-section of the four corners of the glass satisfies 0 < H < 10 mm, and the radius of curvature r > 1000 mm.

[0012] In step S1, the rotation speed of the brush is 2700-3300 rpm, the downward pressure of the brush is 0.2-0.5 mm, the material of the brush is polyester fiber, and the cleaning rate of the brush is 1.5-2.5 m / min.

[0013] In step S2, the thickness of the conductive film layer is between 200Å and 1600Å.

[0014] In step S2, the metal target material is one of chromium or ITO.

[0015] In step S3, the scraper is a polyester scraper, the Shore hardness of the scraper is 65 degrees to 75 degrees, and the angle between the scraper and the screen is 65° to 80°.

[0016] The screen for silk screen printing in step S3 is a polyester screen, the polyester screen uses 300-380 mesh gauze, and the tension of the screen is 14-16N.

[0017] In step S3, the post-drying temperature of the screen printing ink is 140° C. to 160° C., and the drying time is 25 to 30 minutes.

[0018] In step S4, the etching solution is one of Cr etching solution and ITO etching solution; wherein, the etching temperature of the Cr etching solution is 33-37° C., the etching temperature of the ITO etching solution is 43-47° C., and the etching time is 2-5 min.

[0019] The hyperbolic glass screen printing jig used in the method for making a local conductive pattern on hyperbolic glass, the hyperbolic glass screen printing jig includes a concave screen printing jig and a convex screen printing jig; The concave screen printing jig comprises a concave base 1, the concave base 1 is provided with a hyperbolic groove, the concave shape of the hyperbolic groove is consistent with the curvature of the concave hyperbolic glass 2; the hyperbolic groove is used to place the concave hyperbolic glass 2, a No. 1 screen 3 is fixedly installed above the concave hyperbolic glass 2, a convex profiling scraper 4 is provided above the No. 1 screen 3, the convex profiling scraper 4 is a convex scraper, and the concave curvature of the contact surface between the convex scraper and the curved glass is consistent; The convex screen printing jig includes a concave profiling scraper 5; the concave profiling scraper 5 is a concave scraper, and the convex curvature of the contact surface between the concave scraper and the curved glass is consistent, and a No. 2 screen 6 is arranged below the concave profiling scraper 5; a convex base 8 is arranged below the No. 2 screen 6, and the top of the convex base 8 is a hyperbolic convex groove, and the curvature of the hyperbolic convex groove is consistent with the curvature of the contact surface of the convex hyperbolic glass 7, and the convex hyperbolic glass 7 is placed in the hyperbolic convex groove on the top of the convex base 8.

[0020] Preferably, in the ultrasonic cleaning in step S1, 4% to 8% of an alkaline cleaning agent is used, the cleaning temperature is 42-48° C., the ultrasonic frequency is 25 to 35 kHz, and the cleaning time is 3 to 5 min.

[0021] Preferably, in step S1, the high-pressure spray cleaning is water, the flow rate of the high-pressure spray water is a pressure of 2-4 MPa, a flow rate of 15-30 L / min, the flow rate of the air knife is 200-400 L / min, the drying temperature is 100-120°C, and the drying time is 30-60 s.

[0022] Preferably, the water drop angle of the hyperbolic glass washed in step S1 is less than 10°.

[0023] Preferably, the coating power in step S2 is 3-20KW.

[0024] Preferably, the conveying speed of the coated metal target in step S2 is 0.8-1.2 m / min.

[0025] Preferably, the ink in step S3 is one of a film-removing ink and a film-tearing ink.

[0026] Preferably, the thickness of the ink in step S3 is 5-20 um.

[0027] Among them, the film removal ink includes phenolic resin, rosin resin, talcum powder, dimethyl succinate, dimethyl glutarate, dimethyl adipate and epoxy resin, calculated by mass ratio: phenolic resin: rosin resin: talcum powder: dimethyl succinate: dimethyl glutarate: dimethyl adipate: epoxy resin = 20~40:10~20:15~30:2~4:4~8:2~4:5~10.

[0028] Preferably, in step S4, the etching solution is one of a chromium etching solution or an ITO etching solution, the chromium etching solution is purchased from Shenzhen Mousse Optoelectronics Technology Co., Ltd., model MS-FC06, and the chromium etching solution is used to etch chromium; the ITO etching solution includes hydrochloric acid, nitric acid and water, and the ratio of hydrochloric acid: nitric acid: water is 20~28:4~8:65~75 in parts by mass, and the ITO etching solution is used to etch ITO.

[0029] Preferably, in step S4, the heights of the liquid knife and the air knife are 1-4 mm higher than the height of the curved glass.

[0030] Preferably, in step S4, the liquid knife performs liquid cutting, and the liquid knife is an etching liquid with a liquid cutting flow rate of 20-40 L / min.

[0031] Preferably, in step S4, the pressure of the high-pressure water spray is 3-5 MPa, the flow rate is 15-20 L / min, and the flushing time is 2-4 min.

[0032] Preferably, in step S4, the wind pressure of the air knife is 0.005±0.002MPa, and the flow rate is 200~400L / min.

[0033] Preferably, in step S4, the stripping solution is composed of diethylene glycol butyl ether and isopropanolamine, and the mass ratio of diethylene glycol butyl ether to isopropanolamine is 80:8-12.

[0034] Preferably, in step S4, the stripping temperature of the stripping solution is 40-50° C., and the stripping time is 2-5 min.

[0035] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention has developed a production process for making a conductive pattern on a hyperbolic glass. The required metal conductive film layer is plated on the hyperbolic glass by magnetron sputtering, and then the required ink protection pattern is screen-printed on the surface of the metal film layer, and then the conductive film layer not protected by the ink is etched away by a special etching solution, and the protective film layer is removed to obtain the required curved surface conductive pattern. This production process can be directly implemented using traditional coating, screen printing, and etching equipment, without the need to purchase dedicated and expensive curved surface lithography equipment, saving costs, achieving mass production, and high production efficiency. The film layer will not separate, and the reliability of the product is improved.

[0036] 2. A production process for hyperbolic glass conductive patterns can be achieved using traditional flat coating, screen printing, and etching equipment. It does not require expensive curved surface-specific coating (photoresist coating) and exposure equipment, saving production costs.

[0037] 3. A production scheme for making conductive patterns on hyperbolic glass. The key technical points that bring beneficial effects of the present invention are as follows: conductive patterns can be made on hyperbolic glass using traditional coating, silk-screen printing and etching equipment (planar photolithography process), without the need to invest in expensive coating and exposure equipment. A set of customized curved photolithography process equipment costs at least RMB 10 million. The silk-screen printing process is at least 30% lower in production cost than the photolithography process. The current curved photolithography process is immature and has low production efficiency. Batch production of conductive patterns can be achieved on hyperbolic glass, greatly reducing production costs.

[0038] 4. The advantage of the present invention is that the conductive pattern can be produced on the hyperbolic glass by using the conventional coating, screen printing and etching equipment (planar photolithography process), and there is no need to invest in expensive coating and exposure equipment. The conductive pattern can be produced in batches on the hyperbolic glass, which greatly reduces the production cost. Since the conductive film layer Cr is formed directly on the glass by magnetron sputtering, the conductive film is not easy to be delaminated, thereby improving the reliability of the product.

[0039] 5. The present invention has developed a production process for making conductive patterns on hyperbolic glass. A required metal conductive film layer is deposited on the hyperbolic glass by magnetron sputtering, a required protective pattern is screen-printed on the surface of the metal film layer, and then the unprotected conductive film layer is etched away with a special etching solution. After removing the protective film layer, the required curved conductive pattern is obtained. This production process can be directly realized by using traditional coating, screen-printing, and etching equipment, without the need to purchase special curved lithography equipment, saving costs, enabling mass production, having high production efficiency, and the film layer will not separate.

[0040] 6. The present invention has developed a new processing scheme. By using traditional coating equipment, etching equipment, and screen-printing equipment, electrode patterns are made on hyperbolic glass, with low cost, high production efficiency, good film layer adhesion, and not easy to delaminate.

[0041] 7. Using the preparation method of the present invention avoids the use of lithography equipment. Under the same conditions, when preparing curved glass products, the yield of the products is increased by 15% - 20%. The adhesion of the film layer by screen-printing is better than that of the flexible conductive film laminating scheme on the market.

[0042] 8. The height H from the curved vertex of the hyperbolic glass to the plane cross-section of the four corners of the glass satisfies 0 < H < 10 mm, and the radius of curvature r > 1000 mm. It is easy to scratch the glass during cleaning. By screening the brush material and adjusting the downward pressure of the brush, it is possible to avoid scratching the glass during the cleaning process and prevent the glass from being misaligned and stacked during the cleaning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a screen-printing device diagram for printing concave patterns on hyperbolic glass; Figure 2 It is a screen-printing device diagram for printing convex patterns on hyperbolic glass; Figure 3 It is a schematic diagram of the production process for making concave conductive patterns on hyperbolic glass; Figure 4 It is a schematic diagram of the structure of convex conductive patterns on hyperbolic glass.

[0044] Figure 5 It is a schematic structural diagram of the height from the curved vertex of the hyperbolic glass to the plane cross-section of the four corners of the glass.

[0045] Reference numerals: concave base 1; concave hyperbolic glass 2; first screen plate 3; convex profiling squeegee 4; concave profiling squeegee 5; second screen plate 6; convex hyperbolic glass 7; convex base 8. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] Conductive patterns are made on the concave surface of the hyperbolic glass. The conductive film layer is a metal single substance, such as indium, tin, copper, aluminum, molybdenum, chromium, nickel, titanium and other substances, and can also be an alloy material containing the above components. The following is an example of single substance chromium and alloy ITO (ITO is indium tin oxide). The preferred hyperbolic glass material in the present invention is not limited to soda-lime glass, high aluminum glass, borosilicate glass, quartz glass and other materials. The material can be selected according to the needs of the product. The selection of models of the instruments and reagents of the present invention is only for the convenience of explanation, and does not limit the present invention to use this model.

[0047] The characteristic dimensions of the hyperbolic glass are height 0mm<H<10mm, and the corresponding radius of curvature r of the spherical surface is>1000mm. Figure 5 shown.

[0048] Preferably, the alkaline cleaning agent is purchased from Aoxinyuan Applied Chemical Materials Co., Ltd., model number is BJ100; Preferably, the chromium etching solution is purchased from Shenzhen Mousse Optoelectronics Technology Co., Ltd., model: MS-FC06; the chromium-specific Cr etching solution is composed of 20-30% ammonium cerium nitrate, 15-20% activator, 10-20% penetrant, 5-10% dispersant, 5-10% corrosion inhibitor, and the balance is water.

[0049] Preferably, the solvent film removal type ink is purchased from Rongda Photosensitive Technology Co., Ltd., model: thermal curing protective ink THW-5D35; the main components and mass content are composed of 20~40% phenolic resin, 10~20% rosin resin, 15~30% talcum powder, 2~4% dimethyl succinate, 4~8% dimethyl glutarate, 2~4% dimethyl adipate, and 5~10% epoxy resin.

[0050] Preferably, the tear-off type ink is purchased from Zhongshan Xinlihua Electronic Materials Co., Ltd., model: SNS-1120A; the main mass components are 33~42% thermoplastic chlorovinyl resin polymer, 30~40% ester plasticizer, 18~23% modified acrylic resin, 3~5% epoxy soybean oil, 3~5% water resistance accelerator, 1~2% stabilizer, and other 3~5%.

[0051] Preferably, the acid-resistant ink stripping solution is purchased from Jiangyin Jianghua Microelectronic Materials Co., Ltd., model SP-06; the acid-resistant ink stripping solution is composed of diethylene glycol butyl ether: isopropanolamine = 80:8-12 in mass ratio.

[0052] Preferably, the brush is made of polyester fiber.

[0053] Schematic diagram of screen printing concave acid-resistant protective ink printing Figure 1 , Schematic diagram of screen printing convex acid-resistant protective ink printing Figure 2 ; Figure 3This is a process flow chart for making a hyperbolic concave conductive pattern: a layer of chromium conductive film is plated on the cleaned curved glass, and then acid-resistant protective ink is printed after the coating. After the ink is dried, the Cr conductive layer without ink protection is etched away with a metal Cr etching solution, and finally the ink is stripped to obtain the desired hyperbolic concave chromium conductive pattern. Figure 4 It is a process for producing a convex conductive pattern on a hyperbolic surface, and the process is similar to that for producing a concave conductive pattern. Figure 5 It is a schematic diagram of the height H from the vertex of the curved surface to the plane section of the four corners of the glass.

[0054] Example 1 See also Figure 1 and Figure 3 , a Cr conductive pattern is made on the concave surface of the hyperbolic glass. The process includes the following steps: ① Prepare the manufactured hyperbolic glass, the vertical height H from the vertex of the curved glass to the glass cross section (four corner planes) is less than 10mm; Figure 5 .

[0055] ② Use a cleaning agent to clean the hyperbolic glass through ultrasonic cleaning, brush cleaning, and high-pressure spray cleaning equipment, and then blow dry and bake it with an air knife. The water drop angle is less than 10°; Ultrasonic cleaning: The glass is completely immersed in the cleaning agent, using 4%~8% alkaline cleaning agent, the cleaning temperature is 42-48℃, the ultrasonic frequency is 25~35kHZ, and the cleaning time is 3~5min.

[0056] Preferably, 4% alkaline cleaning agent, cleaning temperature is 45°C, ultrasonic frequency is 25 kHz, cleaning time is 3 min, Brush cleaning: After ultrasonic cleaning, the glass is continued to be brushed with a brush. The speed of the brush is 2700~3300rpm, the pressure of the brush is 0.2~0.5 mm, the material of the brush is polyester fiber, and the cleaning rate of the brush is 1.5~2.5m / min.

[0057] Preferably, the brush has a rotation speed of 2800 rpm, a downward pressure of 0.3 mm, and a cleaning speed of 1.5 m / min. The brush is fixed on a conveying device, and the glass is conveyed forward on the conveying device. The cleaning speed of the brush is also the forward speed of the glass relative to the brush.

[0058] High-pressure spraying: The glass after being brushed with a brush is then cleaned by a high-pressure spraying. The high-pressure spraying is a water spraying. The pressure of the high-pressure spraying water is 2~4Mpa, the flow rate is 15~30L / min, and the water spraying time for each piece of glass is 3.2~8min. When blowing the glass dry, the flow rate of the wind knife is set to 200~400 L / min, the drying temperature is 100~120℃, and the drying time is 30~60s.

[0059] Preferably, the water pressure of the high-pressure spray is 2 MPa, the water flow rate is 15 L / min, the water spraying is 5 min, the flow rate of the air knife is 240 L / min, the drying temperature is 100° C., and the drying time is 30 s.

[0060] The water drop angle of the finally cleaned hyperbolic glass was 6°.

[0061] ③ Chrome conductive film was preheated before coating, and the transition chamber temperature was evenly increased from 120℃ to 200℃ in 5min; vacuum was drawn during coating, and the vacuum pressure was 10 -1 Pa or less. Set the Cr target temperature to 200°C, inject 200sccm of Ar gas into the chamber, set the power to 7-13KW, preferably 7KW, and the transmission speed to 0.8-1.2m / min, preferably 0.8m / min. Put the cleaned curved glass into the coating equipment with the above set conditions, and a layer of 800-1200Å metal chromium film, preferably 800Å, will be sputtered on the surface of the curved glass to obtain the required conductive Cr film layer.

[0062] ④ Silk screen acid-resistant protective ink a. Film and screen design: design a film according to the required conductive pattern. The film pattern is consistent with the required conductive pattern. Make a printing screen according to the film pattern. Use a polyester screen. The tension of the hyperbolic screen is smaller than that of the flat printing screen. The tension is 14~16N, preferably 16N. The tension should not be too large. The hyperbolic screen is easy to break during the printing process. If the tension is too small, the screen-printed pattern will be deformed and distorted. The screen printing thickness of the ink is 5μm~20μm, preferably 8μm.

[0063] b. Screen printing jig. Since the conductive pattern is made on the concave surface of the curved glass, it cannot be printed directly on the screen printing platform. It is necessary to make a profiling base and design a concave jig, including a concave base 1; a concave hyperbolic glass 2; a screen 3; a convex profiling scraper 4. The concave base 1 is provided with a hyperbolic groove, and the concave shape of the hyperbolic groove is consistent with the curvature of the curved glass; the hyperbolic groove is used to place the concave hyperbolic glass 2, and a No. 1 screen 3 is fixed above the concave hyperbolic glass 2. The tension of the No. 1 screen 3 is 16N. A convex profiling scraper 4 is arranged above the No. 1 screen 3. The convex profiling scraper 4 is a scraper, and the curvature of the scraper is consistent with that of the concave surface of the curved glass; the scraper hardness of the convex profiling scraper 4 is 65 degrees to 75 degrees, and the angle between the scraper and the screen is 65° to 80°.

[0064] c. Design a silk-screen scraper and cut the printing side of the flat silk-screen scraper to make the curvature consistent with the hyperbolic glass, so as to facilitate printing on the vertex of the concave glass.

[0065] d. Choose protective ink. The ink must be resistant to Cr etching solution and protect the Cr film during etching. It must also be easy to peel off. The acid-resistant ink can be cleanly removed with a stripping solution. You can also choose one of the solvent-removable inks or film-tearing inks.

[0066] e. Screen printing of acid-resistant ink: Remove the base, screen and scraper from the flat screen printer, and then install the screen printing materials and fixtures in step ④ b onto an ordinary flat screen printer. Use the screen printing steps for flat glass to print acid-resistant ink on the concave hyperbolic glass 2, and you can print the acid-resistant ink protection pattern of the Cr conductive film layer that is consistent with the screen.

[0067] f. Drying: Put the glass printed with acid-resistant ink into a dust-free oven and dry it at 150°C for 30 minutes. The acid-resistant effect will be better after drying.

[0068] ⑤ Etching: Use chromium etching liquid, and the etching equipment should be the etching production line equipment for etching flat glass, which consists of 5 sections: spray etching liquid section, etching liquid cutting, high-pressure pure water rinsing, pure water spray cleaning, and air knife drying. It should be noted that the height of the liquid cutting knife and the air knife for drying in the etching section needs to be adjusted to a height greater than that of the curved glass to avoid scratching the product. The etching liquid temperature is 33~37℃, and the etching time is 2-4min. After the product with silk-screen acid-resistant ink is etched, the Cr conductive film layer without ink protection will be etched away, and the Cr conductive film layer covered with ink protection will remain.

[0069] ⑥ Ink stripping: The stripping liquid is composed of diethylene glycol butyl ether and isopropanolamine in a mass ratio of 80:8, which has no corrosive effect on the Cr conductive film layer. The stripping equipment uses a stripping production line for flat glass, which consists of five sections: spray stripping liquid section, stripping liquid cutting, high-pressure pure water rinsing, pure water spray cleaning, and air knife drying. The height of the liquid cutting knife and the air knife in the stripping section needs to be adjusted to a height greater than that of the curved glass to avoid scratching the product. The stripping liquid temperature is 40~50℃, and the stripping time is 3-5min; preferably, the stripping is performed at 50℃ and the stripping time is 3min. After the etched product passes through the stripping section, the acid-resistant ink is stripped off to obtain a hyperbolic Cr conductive film pattern consistent with the silk-screen pattern.

[0070] ⑦ The dimensional accuracy of the above hyperbolic conductive pattern can be within ±0.3mm, which meets the accuracy requirement of ±0.5mm for the windshield or exterior rearview mirror of the car.

[0071] Example 2 See also Figure 2 and Figure 4 , making an ITO conductive pattern on the convex surface of the hyperbolic glass, comprising the following steps: Its production process is basically the same as that of Example 1 in terms of concave surface production, except that the process for plating the conductive film layer and the composition of the etching solution are different, and its silk-screen process is different. The other steps are completely the same as those of Scheme 1.

[0072] ① Prepare the manufactured hyperbolic glass, the vertical height H from the vertex of the curved glass to the glass cross section (four corner planes) is less than 10mm; Figure 5 ; ② Use a cleaning agent to clean the hyperbolic glass through ultrasonic cleaning, brush cleaning, and high-pressure spray cleaning equipment, and then blow dry with an air knife, bake and dry. The water drop angle is less than 10°; Ultrasonic cleaning: The glass is completely immersed in the cleaning agent, using 4%~8% alkaline cleaning agent, the cleaning temperature is 42-48℃, the ultrasonic frequency is 25~35kHZ, and the cleaning time is 3~5min.

[0073] Preferably, 6% alkaline cleaning agent, cleaning temperature is 46°C, ultrasonic frequency is 35 kHz, cleaning time is 3 min, Brush cleaning: After ultrasonic cleaning, the glass is continued to be brushed with a brush. The speed of the brush is 2700~3300rpm, the pressure of the brush is 0.2~0.5 mm, the material of the brush is polyester fiber, and the cleaning rate of the brush is 1.5~2.5m / min.

[0074] Preferably, the rotation speed of the brush is 3000 rpm, the downward pressure of the brush is 0.2 mm, and the cleaning rate of the brush is 2 m / min.

[0075] High-pressure spraying: The glass after being brushed with a brush is then cleaned by a high-pressure spraying. The high-pressure spraying is a water spraying. The pressure of the high-pressure spraying water is 2~4Mpa, the flow rate is 15~30L / min, and the water spraying time for each piece of glass is 3.2~8min. When blowing the glass dry, the flow rate of the wind knife is 200~400 L / min, the drying temperature is 100~120℃, and the drying time is 30~60s.

[0076] Preferably, the water pressure of the high-pressure spray is 3 MPa, the water flow rate is 20 L / min, the water spraying is 8 minutes, the flow rate of the air knife is 240 L / min, the drying temperature is 120° C., and the drying time is 30 seconds.

[0077] The water drop angle of the finally cleaned hyperbolic glass was 5°.

[0078] ③ Plating ITO conductive film, preheating the coating, gradually and evenly raise the temperature of the transition chamber from 300℃ to 380℃ for 5 minutes; vacuumize during operation, and the pressure is 10 -1Pa or less. Use magnetron sputtering coating equipment to coat ITO film on the convex surface of the hyperbolic glass, set the ITO target area temperature to 380°C, inject a mixed gas of argon and oxygen with a volume ratio of 300sccm:80sccm into the chamber, set the power to 20KW, and the transmission speed to 1.2m / min. Put the cleaned curved glass into the coating equipment with the above setting conditions, and a 1200Å ITO conductive film will be sputtered on the convex surface of the curved glass to obtain the required ITO conductive film layer.

[0079] ④ Silk screen acid-resistant protective ink a. Film and screen design: design a film according to the required conductive pattern. The film pattern is consistent with the conductive pattern. Make a printing screen according to the film pattern. The screen uses a polyester screen. The screen tension is smaller than that of the flat printing screen. The tension is 14~16N, preferably 14N. The tension cannot be too large, otherwise the screen is easy to break during the printing process. The screen printing thickness of the ink is 5μm~20μm, preferably 8μm.

[0080] b. Silk screen jig. Since the conductive pattern is made on the convex surface of the curved glass, it cannot be printed directly on the silk screen printing platform. It is necessary to make a contoured base and design a concave scraper. The concave shape of the scraper is consistent with the curvature of the convex surface of the curved glass.

[0081] The concave profile scraper 5, the second screen 6, and the convex base 8 are installed on an ordinary flat screen printing machine. The top of the convex base 8 is a hyperbolic convex groove, and the curvature of the hyperbolic convex groove is consistent with the curvature of the contact surface of the convex hyperbolic glass 7. The convex hyperbolic glass 7 is placed in the hyperbolic convex groove on the top of the convex base 8; then the acid-resistant ink is printed to print an acid-resistant protective pattern consistent with the screen; Because the two corners of the concave profile scraper 5 blade head easily scratch the screen. The tension of the second screen is 14N, the scraper hardness of the concave profile scraper 5 is 75 degrees, and the angle between the scraper and the screen is 80°.

[0082] c. Silk-screen squeegee design: Cut the printed side of the ordinary flat silk-screen squeegee into a curvature consistent with that of the hyperbolic glass, so as to facilitate printing on the vertex of the convex glass; d. Acid-resistant protective ink. The ink must be resistant to ITO etching solution. It can protect the ITO film during etching and be easy to peel off. The acid-resistant ink can be removed cleanly with a stripping solution. You can also choose an acid-resistant ink that can form a film after drying and can be directly torn off.

[0083] e. Screen printing acid-resistant ink: Install the above-mentioned screen printing materials and jigs on an ordinary flat screen printing machine, use conventional screen printing methods to print acid-resistant ink, and print out an acid-resistant protective pattern consistent with the screen; f. Drying: put the glass printed with acid-resistant ink into a dust-free oven and dry it at 160°C for 30 minutes. The acid-resistant effect will be better after drying. ⑤ Etching: Use ITO etching solution, which is mainly composed of 20~28% hydrochloric acid, 4~8% nitric acid, and 65~75% water. In this embodiment, 28% hydrochloric acid and 4% nitric acid are preferred, and the balance is water; the etching equipment uses an etching production line for etching flat glass, which consists of five sections: spray etching liquid section, etching liquid cutting, high-pressure pure water rinsing, pure water spray cleaning, and air knife drying. It should be noted that the height of the liquid cutting liquid knife and the drying air knife in the etching section needs to be adjusted to 1~4mm higher than the height of the curved glass to avoid scratching the product. The etching liquid temperature is 43~47℃, and the etching time is 2~5min; preferably, etching is performed at 47℃ for 2min. After the product with silk-screen acid-resistant ink is etched, the ITO conductive film layer that is not protected by the ink is etched away, and the remaining ITO protected by the ink is left.

[0084] ⑥ Ink stripping: The selected stripping liquid is composed of diethylene glycol butyl ether: isopropanolamine in a mass ratio of 80:12, which has no corrosive effect on the ITO conductive film layer. The stripping equipment uses a stripping production line for flat glass, which consists of five sections: spray stripping liquid section, stripping liquid cutting, high-pressure pure water rinsing, pure water spray cleaning, and air knife drying. It should be noted that the height of the liquid cutting knife and the air knife for drying in the stripping section needs to be adjusted to 1~4mm higher than the height of the curved glass, preferably 3mm, to avoid scratching the product. The stripping liquid temperature is 40~50℃, and the stripping time is 2~4min; this embodiment preferably strips at 50℃ and strips for 2min. After the etched product passes through the stripping section, the acid-resistant ink is stripped off to obtain a hyperbolic ITO conductive film pattern consistent with the silk-screen pattern.

[0085] ⑦ The dimensional accuracy of the above hyperbolic conductive pattern can be within ±0.3mm, which meets the accuracy requirement of ±0.5mm for the windshield or exterior rearview mirror of the car.

[0086] Example 3 A hyperbolic glass screen printing jig used in a method for making a local conductive pattern on hyperbolic glass, the hyperbolic glass screen printing jig comprising a concave screen printing jig and a convex screen printing jig; The concave screen printing jig comprises a concave base 1, the concave base 1 is provided with a hyperbolic groove, the concave shape of the hyperbolic groove is consistent with the curvature of the concave hyperbolic glass 2; the hyperbolic groove is used to place the concave hyperbolic glass 2, a No. 1 screen 3 is fixedly installed above the concave hyperbolic glass 2, a convex profiling scraper 4 is provided above the No. 1 screen 3, the convex profiling scraper 4 is a convex scraper, and the concave curvature of the contact surface between the convex scraper and the curved glass is consistent; The convex screen printing jig includes a concave profiling scraper 5; the concave profiling scraper 5 is a concave scraper, and the convex curvature of the contact surface between the concave scraper and the curved glass is consistent, and a No. 2 screen 6 is arranged below the concave profiling scraper 5; a convex base 8 is arranged below the No. 2 screen 6, and the top of the convex base 8 is a hyperbolic convex groove, and the curvature of the hyperbolic convex groove is consistent with the curvature of the contact surface of the convex hyperbolic glass 7, and the convex hyperbolic glass 7 is placed in the hyperbolic convex groove on the top of the convex base 8.

[0087] When using a hyperbolic glass screen printing jig, the concave screen printing jig and the convex screen printing jig can be replaced and installed with the base, screen plate and scraper of the jig in the existing ordinary screen printing equipment.

[0088] The above embodiments are only the preferred embodiments of the present invention. This application only takes Cr and ITO as two conductive film layers as examples. Different etching solutions are required according to different conductive film layers. Other process flows are the same, and this application does not provide an exhaustive description. For those skilled in the art, when the process flow of the present invention is used for production, even if other metal conductive film layers are plated and different etching solutions are used, they all fall within the protection scope of this application. Materials such as copper, aluminum, molybdenum, nickel, and titanium may also be alloy materials containing the above components. Alternative solutions of this application also include film layers obtained by coating using other processes, such as vacuum coating or adjusting some parameters of magnetron sputtering coating.

[0089] A conductive film layer is plated on the concave and convex surfaces of the hyperbolic glass using magnetron sputtering coating equipment. The film layer is generally a monomer of a substance such as indium, tin, copper, aluminum, molybdenum, chromium, nickel, titanium, etc.; it can also be an alloy containing the above metal substances, such as copper-nickel, molybdenum-aluminum and other alloys. The thickness of the chromium and ITO of the conductive film layer can be adjusted according to actual needs, such as chromaticity, resistance value, etc., to obtain the required conductive film layer; when this process is used for production, such improvements on the thickness and material of the conductive film layer also fall within the scope of protection of this application. The parts not described in detail in the present invention are all prior art and can be fully implemented by those skilled in the art.

Claims

1. A method for making a local conductive pattern on a hyperbolic glass, characterized in that: It includes the following steps: S1. Cleaning: Ultrasonically clean the hyperbolic glass, brush it with a brush, spray it under high pressure, dry it with an air knife, and then bake it to obtain the cleaned hyperbolic glass; S2. Coating: Coat the cleaned hyperbolic glass in step S1 with a metal target to obtain a hyperbolic glass with a conductive film layer; S3. Silk screening: Use a squeegee and a screen plate to silk screen ink on the hyperbolic glass with a conductive film layer in step S2 and then bake it to obtain a hyperbolic glass with printed ink; S4. Etching first and then stripping: Use an etching liquid knife to cut, wash it under high pressure with water, wash it with water spray, dry it with an air knife, and then strip the film with a stripping liquid on the hyperbolic glass with printed ink in step S3 to obtain a hyperbolic glass with a conductive pattern.

2. A method for making a local conductive pattern on a hyperbolic glass according to claim 1, characterized in that: In step S1, the height H from the vertex of the curved surface of the hyperbolic glass to the plane cross-section of the four corners of the glass satisfies 0 < H < 10 mm, and the radius of curvature r > 1000 mm.

3. The method for making a local conductive pattern on a hyperbolic glass according to claim 1, characterized in that: In step S1, the rotation speed of the brush is 2700 - 3300 rpm, the downward pressure of the brush is 0.2 - 0.5 mm, the material of the brush is polyester fiber, and the cleaning speed of the brush is 1.5 - 2.5 m / min.

4. The method for making a local conductive pattern on a hyperbolic glass according to claim 1, characterized in that: In step S2, the thickness of the conductive film layer is 200 Å - 1600 Å.

5. The method for making a local conductive pattern on a hyperbolic glass according to claim 1, characterized in that: In step S2, the metal target is one of chromium or ITO.

6. The method for making a local conductive pattern on a hyperbolic glass according to claim 1, characterized in that: In step S3, the squeegee is a polyester rubber squeegee, the Shore hardness of the squeegee is 65 - 75 degrees, and the angle between the squeegee and the screen plate is 65° - 80°.

7. The method for making a local conductive pattern on a hyperbolic glass according to claim 1, characterized in that: In step S3, the screen plate for silk screening is a polyester screen plate. The polyester screen plate selects a screen mesh with 300 - 380 meshes, and the tension of the screen plate is 14 - 16 N.

8. The method for making a local conductive pattern on a hyperbolic glass according to claim 1, characterized in that: In step S3, the baking temperature after silk screening the ink is 140℃ - 160℃, and the baking time is 25 - 30 min.

9. The method for making a local conductive pattern on a hyperbolic glass according to claim 1, characterized in that: In step S4, the etching liquid is one of Cr etching liquid or ITO etching liquid; among them, the etching temperature of the Cr etching liquid is 33 - 37℃, the etching temperature of the ITO etching liquid is 43 - 47℃, and the etching time is 2 - 5 min.

10. A hyperbolic glass screen printing jig used in a method for making a local conductive pattern on hyperbolic glass according to any one of claims 1 to 9, characterized in that: The hyperbolic glass silk screening fixture includes a concave surface silk screening fixture and a convex surface silk screening fixture; The concave surface silk screening fixture includes a concave base (1). The concave base (1) is provided with a hyperbolic groove, and the concave shape of the hyperbolic groove is consistent with the curvature of the concave hyperbolic glass (2); the hyperbolic groove is used to place the concave hyperbolic glass (2). Above the concave hyperbolic glass (2), a first screen plate (3) is fixedly installed. Above the first screen plate (3), a convex surface profiling squeegee (4) is provided. The convex surface profiling squeegee (4) is a convex squeegee, and the concave curvature of the contact surface between the convex squeegee and the curved surface glass is consistent; The convex surface silk screening fixture includes a concave surface profiling squeegee (5); the concave surface profiling squeegee (5) is a concave squeegee, and the convex curvature of the contact surface between the concave squeegee and the curved surface glass is consistent. Below the concave surface profiling squeegee (5), a second screen plate (6) is provided; below the second screen plate (6), a convex base (8) is provided. The top of the convex base (8) is a hyperbolic convex groove, and the curvature of the hyperbolic convex groove is consistent with the curvature of the contact surface of the convex hyperbolic glass (7). The convex hyperbolic glass (7) is placed in the hyperbolic convex groove at the top of the convex base (8).

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