A kind of evaporation device and a method for preparing an antifouling film

Abstract

The present invention belongs to the technical field of antifouling film preparation, and specifically relates to an evaporation device and an antifouling film preparation method. The evaporation device of the present invention includes an evaporation chamber, a conveyor belt, an evaporation container and a heating component. An evaporation umbrella frame is arranged at the top of the evaporation chamber, and the conveyor belt is arranged obliquely below the evaporation umbrella frame. The evaporation container is installed on the conveyor belt and is driven to move by the conveyor belt. An opening is arranged at the top of the evaporation container, and an evaporation container heater is arranged at the bottom of the evaporation container. The heating component is used to heat the evaporation chamber. The preparation method of the antifouling film provided by the present invention is prepared by using the above-mentioned evaporation device. It can shorten the evaporation distance and reduce the waste of evaporation on the invalid area; and the present invention does not need to use an auxiliary plate (MASK), which reduces the waste of antifouling agents, thereby effectively reducing the preparation cost of the antifouling film. At the same time, the antifouling film prepared by the present invention is more uniform and has excellent hydrophobic effect.

Description

Technical Field

[0001] The invention belongs to the technical field of antifouling film preparation, and specifically relates to a vapor deposition device and a method for preparing an antifouling film. Background Art

[0002] At present, for organic lenses, the ideal surface system is a composite film including an anti-wear film, a multi-layer anti-reflection film (AR film) and a top film anti-fouling film. The preparation of organic lenses generally involves first coating a certain thickness of SiO2 on the lens with the assistance of ion beam sputtering (IBS) to improve the wear resistance of the material (i.e., an anti-wear film). Then, an AR film is coated. The AR film is also called an anti-reflection film. Its main function is to reduce or eliminate the reflected light from optical surfaces such as lenses, prisms, and plane mirrors, thereby increasing the light transmittance of these components and reducing or eliminating the stray light of the system. However, since the optical surface is coated with a multi-layer anti-reflection film, the lens is particularly prone to stains, and the stains will destroy the anti-reflection effect of the AR film. Therefore, the current solution is to coat the AR film with a layer of film with anti-oil and anti-water properties, also known as an anti-fouling film. Moreover, the anti-fouling film must be very thin (about 20nm) so that it will not change the optical properties of the original AR film on the lens surface.

[0003] The material of the antifouling film is mainly fluoride. There are currently two processing methods. The first is the steam resistance heating (RH) method. The schematic diagram of the device used is as follows: Figure 2 As shown in the figure, the specific usage rate accounts for 90% of the industry. The principle is to pass electricity through the resistor, and then use the tungsten boat or molybdenum boat as a carrier to carry the heat energy to heat the bottom of the antifouling pill, so that the antifouling medicine evaporates from the steel wool and deposits on the surface of the substrate. The second method is the electron gun evaporation (EB) method. The schematic diagram of the device structure used is shown in the figure below. Figure 3 As shown, the specific usage rate accounts for 10% of the industry. The principle is to emit an electron beam through an electron gun, and through the deflection of the magnetic field, control the electron beam to hit the steel wool of the anti-fouling pill, so that the anti-fouling drug evaporates and deposits on the surface of the substrate.

[0004] However, the above two methods have a long evaporation distance and are prone to evaporation onto the guard plate and other ineffective areas, resulting in waste of antifouling pills and high manufacturing costs for the antifouling film. Summary of the invention

[0005] The object of the present invention is to provide a vapor deposition device and a method for preparing an antifouling film. The present invention adopts a vapor deposition device to prepare the antifouling film, which can shorten the evaporation distance and reduce the waste of vapor deposition on the invalid area; and the present invention does not need to use an auxiliary plate (MASK), which reduces the waste of antifouling agents, thereby effectively reducing the preparation cost of the antifouling film. At the same time, the antifouling film prepared by the present invention is more uniform and has excellent hydrophobic effect.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides an evaporation device, comprising:

[0008] The evaporation chamber has an evaporation umbrella stand on the top thereof, the central axis of the evaporation umbrella stand is arranged vertically, and the evaporation umbrella stand can rotate horizontally around the central axis;

[0009] A conveyor belt is installed inside the evaporation chamber through a conveyor belt bracket, the conveyor belt is obliquely arranged below the evaporation umbrella frame, one end of the conveyor belt is close to the central axis of the evaporation umbrella frame, and the other end of the conveyor belt extends downward to below the edge of the evaporation umbrella frame;

[0010] An evaporation container is installed on the conveyor belt and is moved by the conveyor belt. An opening is provided at the top of the evaporation container. An evaporation container heater is provided at the bottom of the evaporation container.

[0011] The heating component is used to heat the evaporation chamber.

[0012] Preferably, the angle between the conveyor belt and the horizontal plane is 15° to 30°.

[0013] Preferably, the conveyor belt is parallel to a chord corresponding to a generatrix of the curved surface where the vapor-deposited umbrella stand is located.

[0014] Preferably, a connecting block is fixedly connected to the inner wall of the evaporation chamber, and the conveyor belt bracket is fixedly connected to the connecting block by bolts.

[0015] The present invention provides a method for preparing an antifouling film, which is prepared by using the evaporation device described in the above technical solution, and comprises the following steps:

[0016] Placing the lens on the evaporation umbrella frame in the evaporation chamber, with the surface of the lens on which the antifouling film is to be prepared facing outwards;

[0017] Add antifouling agent into the evaporation vessel;

[0018] The evaporation chamber is evacuated, and then the evaporation chamber is heated by a heating component, and the evaporation container is heated by an evaporation container heater until the antifouling agent evaporates; when the antifouling agent begins to evaporate, the evaporation container moves from top to bottom along with the conveyor belt, while keeping the evaporation umbrella frame horizontally rotating around its central axis, and the antifouling agent is evaporated on the surface of the lens; the evaporation container moves to the lowest end of the conveyor belt, and the antifouling film is obtained on the surface of the lens.

[0019] Preferably, the evaporation container moves with the conveyor belt at a uniform speed, and the moving speed of the evaporation container with the conveyor belt is 5-10 cm / min.

[0020] Preferably, the evaporation umbrella stand rotates at a uniform speed, and the rotation speed of the evaporation umbrella stand is 20 to 30 r / min.

[0021] Preferably, the heating temperature of the evaporation chamber is 75-80°C.

[0022] Preferably, the working parameters of the evaporation container heater for heating the evaporation container include: a current of 100-200 mA and a time of 250-300 s.

[0023] Preferably, the antifouling film has a thickness of 20 to 25 nm; and the antifouling agent contains fluoride.

[0024] The present invention provides a vapor deposition device, comprising: a vapor deposition chamber, a vapor deposition umbrella frame is arranged on the top of the chamber, the central axis of the vapor deposition umbrella frame is arranged vertically, and the vapor deposition umbrella frame can rotate horizontally around its central axis; a conveyor belt is installed in the interior of the vapor deposition chamber through a conveyor belt bracket, the conveyor belt is arranged obliquely below the vapor deposition umbrella frame, one end of the conveyor belt is close to the central axis of the vapor deposition umbrella frame, and the other end extends downward to below the edge of the vapor deposition umbrella frame; an evaporation container is installed on the conveyor belt and is driven to move by the conveyor belt, and the top of the evaporation container is provided with an opening; the bottom of the evaporation container is provided with an evaporation container heater; a heating component is used to heat the vapor deposition chamber. The vapor deposition device provided by the present invention can move the evaporation container containing the evaporation source (antifouling agent) along the conveyor belt by adding a conveyor belt. The movable setting of the evaporation source not only makes the evaporation position closer to the lens position of the antifouling film to be evaporated, reducing the waste of evaporation on the invalid area, but also makes the antifouling agent evaporate more evenly on the lens surface, thereby obtaining an antifouling film with excellent hydrophobic performance. At the same time, the evaporation device provided by the present invention does not need to use a mask, thereby reducing the waste of antifouling agents and effectively reducing the preparation cost of the antifouling film.

[0025] The present invention provides a method for preparing an antifouling film, which is prepared by using the evaporation device described in the above technical solution, and includes the following steps: placing a lens on an evaporation umbrella frame in the evaporation chamber, with the surface of the lens to be prepared with the antifouling film facing outward; adding an antifouling agent into an evaporation container; evacuating the evaporation chamber, and then heating the evaporation chamber with a heating component, and heating the evaporation container with an evaporation container heater until the antifouling agent evaporates; when the antifouling agent begins to evaporate, the evaporation container moves from top to bottom with the conveyor belt, while keeping the evaporation umbrella frame horizontally rotating around its central axis, and evaporating the antifouling agent on the surface of the lens; the evaporation container moves to the lowest end of the conveyor belt, and the antifouling film is obtained on the surface of the lens. The present invention uses the above evaporation device to prepare the antifouling film, which can shorten the evaporation distance and reduce the waste of evaporation on the invalid area; and the present invention does not need to use an auxiliary positive plate (MASK), which reduces the waste of antifouling agents, thereby effectively reducing the preparation cost of the antifouling film, and the antifouling film prepared by the present invention is more uniform and has excellent hydrophobic effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of the evaporation device provided by the present invention;

[0027] Figure 2 It is a structural schematic diagram of a device for using the RH method in the prior art;

[0028] Figure 3 It is a structural schematic diagram of an apparatus for using the EB method in the prior art;

[0029] In the figure: 1 is a vapor deposition chamber, 2 is a conveyor belt, 3 is a conveyor belt, 4 is an evaporation container, 5 is a conveyor belt bracket, 6 is an evaporation container heater, 7 is a lens, 8 is a chord corresponding to the generatrix of the curved surface where the vapor deposition umbrella frame is located, 9 is a connecting block, and 10 is an auxiliary positive plate (MASK). DETAILED DESCRIPTION

[0030] The present invention provides an evaporation device, comprising:

[0031] The evaporation chamber 1 has an evaporation umbrella stand 2 disposed on the top thereof, wherein the central axis of the evaporation umbrella stand 2 is disposed vertically, and the evaporation umbrella stand 2 can rotate horizontally around the central axis;

[0032] The conveyor belt 3 is installed in the evaporation chamber 1 through the conveyor belt bracket 5. The conveyor belt 3 is obliquely arranged below the evaporation umbrella frame 2. One end of the conveyor belt 3 is close to the central axis of the evaporation umbrella frame 2, and the other end extends downward to below the edge of the evaporation umbrella frame 2.

[0033] An evaporation container 4 is installed on the conveyor belt 3 and is moved by the conveyor belt 3. An opening is provided at the top of the evaporation container 4. An evaporation container heater 6 is provided at the bottom of the evaporation container 4.

[0034] The heating component is used to heat the evaporation chamber 1 .

[0035] The structural schematic diagram of the evaporation device provided by the present invention is as follows Figure 1 As shown below, combined Figure 1 The evaporation device provided by the present invention is described in detail.

[0036] The evaporation device provided by the present invention comprises an evaporation chamber 1. The evaporation chamber 1 is used for evaporation of an antifouling film.

[0037] In the present invention, the top of the obtained evaporation chamber 1 is provided with an evaporation umbrella frame 2. In the present invention, the evaporation umbrella frame 2 is used to carry the lens to be coated. The central axis of the evaporation umbrella frame 2 is arranged vertically, and the evaporation umbrella frame 2 can rotate horizontally around its central axis.

[0038] The evaporation device provided by the present invention includes a conveyor belt 3, which is installed inside the evaporation chamber 1 through a conveyor belt bracket 5. The conveyor belt 3 is tilted below the evaporation umbrella frame 2, and one end of the conveyor belt 3 is close to the central axis of the evaporation umbrella frame 2, and the other end extends downward to below the edge of the evaporation umbrella frame 2. In the present invention, the conveyor belt is tilted, and the conveyor belt 3 is used to drive the evaporation container 4 to move. In the embodiment of the present invention, the preparation process of the antifouling film is performed, and the conveyor belt 3 is used to drive the evaporation container 4 from the higher end (upper end) of the conveyor belt 3 to the lower end (lower end) of the conveyor belt 3.

[0039] In the present invention, the angle between the conveyor belt 3 and the horizontal plane is preferably 10 to 45°, more preferably 15 to 30°. By optimizing the angle between the conveyor belt 3 and the horizontal plane to 10 to 45°, more preferably 15 to 30°, the present invention can make the anti-fouling film on the surfaces of multiple lenses on the evaporation umbrella stand 2 more uniform during the evaporation of the anti-fouling film.

[0040] As one or more embodiments of the present invention, the angle between the conveyor belt 3 and the horizontal plane is 18°.

[0041] As one or more embodiments of the present invention, the conveyor belt 3 is parallel to the chord 8 corresponding to the generatrix of the curved surface where the evaporation umbrella frame 2 is located. The present invention can ensure that when the evaporation umbrella frame 2 is horizontally rotated around its central axis and the evaporation container 4 is moved from top to bottom on the conveyor belt 3, the distances between the multiple lenses and the evaporation container 4 are substantially the same, so that the anti-fouling film on the surfaces of the multiple lenses on the evaporation umbrella frame 2 is evaporated more evenly by controlling the conveyor belt 3 to be parallel to the chord 8 corresponding to the generatrix of the curved surface where the evaporation umbrella frame 2 is located.

[0042] As one or more embodiments of the present invention, a connecting block 9 is fixedly connected to the inner wall of the evaporation chamber 1, and the conveyor belt support 5 is fixedly connected to the connecting block 9 by bolts.

[0043] The evaporation device provided by the present invention includes an evaporation container 4, which is installed on the conveyor belt 3 and is moved by the conveyor belt 3. The top of the evaporation container 4 is provided with an opening; the bottom of the evaporation container 4 is provided with an evaporation container heater 6. In the present invention, the evaporation container 4 is used to contain an evaporation source substance. In a specific embodiment of the present invention, the evaporation source substance is specifically an antifouling agent. In the present invention, the evaporation container heater 6 is used to heat the evaporation container 4, so that the evaporation source substance in the evaporation container 4 can be evaporated into gas after being heated.

[0044] As one or more embodiments of the present invention, the evaporation container heater 6 is specifically a resistance wire.

[0045] The evaporation device provided by the present invention comprises a heating component. In the present invention, the heating component is used to heat the evaporation container.

[0046] The evaporation device provided by the present invention preferably further includes a vacuum pumping device, and the vacuum pumping device is used to evacuate the evaporation chamber.

[0047] The present invention provides a method for preparing an antifouling film, which is prepared by using the evaporation device described in the above technical solution, and comprises the following steps:

[0048] The lens 7 is placed on the evaporation umbrella frame 2 in the evaporation chamber 1, with the surface of the lens 7 on which the antifouling film is to be prepared facing outwards;

[0049] Adding antifouling agent into evaporation container 4;

[0050] The evaporation chamber is evacuated, and then the evaporation chamber is heated by a heating component, and the evaporation container is heated by an evaporation container heater until the antifouling agent evaporates; when the antifouling agent begins to evaporate, the evaporation container moves from top to bottom along with the conveyor belt, while keeping the evaporation umbrella frame horizontally rotating around its central axis, and the antifouling agent is evaporated on the surface of the lens; the evaporation container moves to the lowest end of the conveyor belt, and the antifouling film is obtained on the surface of the lens.

[0051] In the present invention, unless otherwise specified, all preparation raw materials / components are commercially available products well known to those skilled in the art.

[0052] In the present invention, the lens 7 is arranged on the evaporation umbrella frame 2 in the evaporation chamber 1, and the surface of the lens 7 on which the antifouling film is to be prepared faces outward. In the present invention, a plurality of lenses are preferably arranged on the evaporation umbrella frame 7 of the evaporation chamber 1.

[0053] After the lens 7 is arranged on the evaporation umbrella frame 2 of the evaporation chamber 1, the present invention adds the antifouling agent into the evaporation container 4. In the present invention, the initial position of the evaporation container 4 is located at one end of the conveyor belt 3 close to the central axis of the evaporation umbrella frame 2 (i.e., the other end away from the inner wall of the evaporation chamber 1). In the present invention, the antifouling agent preferably contains fluoride. The present invention has no special requirements on the type of the antifouling agent, and commercially available antifouling agents such as those produced by Dow Corning, Duwin or Daikin of Japan can be used. The present invention has no special requirements on the amount of the antifouling agent, and it is sufficient to ensure that an antifouling film of sufficient thickness can be prepared on the surface of the lens.

[0054] After the lens 7 is arranged on the evaporation umbrella frame 2 of the evaporation chamber 1 and the antifouling agent is placed in the evaporation container 4, the present invention preferably closes the evaporation chamber 1, then evacuates the evaporation chamber 1, and then heats the evaporation chamber 1 with a heating component, and heats the evaporation container 4 with an evaporation container heater 6 until the antifouling agent evaporates; when the antifouling agent starts to evaporate, the evaporation container 4 moves from top to bottom with the conveyor belt 3, while keeping the evaporation umbrella frame 2 horizontally rotating around its central axis, and evaporates the antifouling agent on the surface of the lens 7; the evaporation container 4 moves to the lowest end of the conveyor belt 3, and the antifouling film is obtained on the surface of the lens 7.

[0055] In the present invention, the evaporation container 4 moves at a uniform speed with the conveyor belt 3, and the moving speed of the evaporation container 4 with the conveyor belt 3 is preferably 5-10 cm / min. The evaporation umbrella stand 2 rotates at a uniform speed, and the rotation speed of the evaporation umbrella stand 2 is preferably 20-30 r / min. The heating temperature of the evaporation chamber 1 is preferably 75-80°C. The evaporation container heater 6 heats the evaporation container 4 until the antifouling agent evaporates, and the evaporation temperature of the antifouling agent is preferably ≥160°C. The working parameters of the evaporation container heater 6 for heating the evaporation container preferably include: the current is preferably 100-200mA, and more preferably 100-120mA; the time is preferably 250-300s. The time for the evaporation container heater 6 to heat the evaporation container is the time for the evaporation container 4 to move from the higher end to the lower end with the conveyor belt 3.

[0056] In the present invention, the thickness of the antifouling film is preferably 20 to 25 nm.

[0057] The method for preparing the antifouling film provided by the present invention adopts a conveyor belt to move the evaporation container. The evaporation distance of the present invention is much shorter than that of the barrier heating (RH) method and the electron gun evaporation (EB) method in the prior art, thereby reducing the waste of evaporation on the guard plate and other invalid areas.

[0058] The method for preparing the antifouling film provided by the present invention does not require a MASK on the evaporation source (the MASK is a component for correcting the thickness uniformity of the antifouling film on the lenses of various parts of the vapor-deposited umbrella frame, mainly relying on the shielding effect to make the thickness of the antifouling film of the entire umbrella frame product consistent), thereby reducing the waste of antifouling agents.

[0059] The method for preparing the antifouling film provided by the present invention has a mobile evaporation source, and the obtained antifouling film is more uniform and has good consistency.

[0060] In order to further illustrate the present invention, the technical solutions provided by the present invention are described in detail below in conjunction with embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0061] The antifouling agents used in the following Example 1 and Comparative Examples 1-2 are all antifouling agents produced by Japan Daikin.

[0062] Example 1

[0063] This embodiment adopts Figure 1 The evaporation device shown is used to prepare the antifouling film, and the specific steps are as follows:

[0064] The first step is to place the lens product on the evaporation umbrella stand in the evaporation chamber and make sure it is placed flat and without any abnormalities.

[0065] The second step is to add antifouling agent into the evaporation container located at one end of the conveyor belt away from the inner side wall of the evaporation chamber (the upper end of the conveyor belt), and the conveyor belt is parallel to the chord corresponding to the generatrix of the curved surface where the evaporation umbrella frame is located (the angle between the conveyor belt 3 and the horizontal plane is 18°). The third step is to check whether there are any foreign objects such as missing tools in the evaporation chamber and close the door of the evaporation chamber.

[0066] The fourth step is to use a vacuum pump to evacuate the evaporation chamber to a vacuum level of 2E10. -3 Pa.

[0067] Step 5: After checking the heating component program and confirming that it is correct, start heating the evaporation container, and use the evaporation container heater 6 to heat the evaporation container until the antifouling agent evaporates. The evaporation container is heated to 80°C, and the working parameters of the evaporation container heater 6 to heat the evaporation container 4 include: current of 200mA, time of 250s, heating the antifouling agent in the evaporation container to above 160°C, until the evaporation agent evaporates.

[0068] Step 6: The vacuum degree is drawn to the set value (2E10 -3 During the coating process, the evaporation container moves from top to bottom along the conveyor belt, and moves at a uniform speed from one end (upper end) of the conveyor belt away from the inner wall of the evaporation chamber to one end (lower end) close to the inner wall of the evaporation chamber. The movement speed of the evaporation container is 10 cm / min, and the rotation speed of the evaporation umbrella frame of the evaporation chamber is 30 r / min. Until the evaporation container moves to the lowest position, the evaporation of the antifouling agent is completed, and an antifouling film is obtained. The thickness of the antifouling film is 20 nm.

[0069] Step 7. After the equipment has cooled down, open the door to release air, and the anti-fouling film for the entire pot of product is completed.

[0070] Step 8: Test the product, including two test standards:

[0071] 1. The water drop angle is tested on a professional water drop angle tester and confirmed to be >110°;

[0072] 2. Friction resistance test: rub 3000 times with a load of 1kg and a speed of 60cycle / min, then test on a water drop angle tester and confirm that it is >100°.

[0073] Confirm that the product is OK.

[0074] Comparative Example 1

[0075] This comparative example adopts Figure 2 The device shown is used to prepare antifouling films. Figure 2 The evaporation container is located at the center of the bottom surface of the evaporation chamber, and the evaporation resistance heating (RH) method is adopted. The specific steps are as follows:

[0076] The first step is to place the lens product on the evaporation umbrella stand in the evaporation chamber and make sure it is placed flat and without any abnormalities.

[0077] The second step is to add antifouling agent into the evaporation container.

[0078] The third step is to check whether there are any missing tools or other foreign objects in the evaporation chamber and close the door of the evaporation chamber.

[0079] The fourth step is to use a vacuum pump to evacuate the evaporation chamber to a vacuum level of 2E10. -3 Pa.

[0080] Step 5: After checking the heating component and confirming that the program is correct, start heating the evaporation container, and use the evaporation container heater 6 to heat the evaporation container until the antifouling agent evaporates. The evaporation container is heated to 80°C, and the working parameters of the evaporation container heater 6 to heat the evaporation container 4 include: current of 200mA, time of 250s (RH is conducted from the bottom to the bottom of the antifouling agent for evaporation), and the antifouling agent in the evaporation container is heated to above 160°C until the evaporated agent volatilizes.

[0081] Step 6: The vacuum degree is drawn to the set value (2E10 -3 Pa) to start automatic coating. During the coating process, the rotation speed of the evaporation umbrella frame in the evaporation chamber is 30r / min. The evaporation of the antifouling agent is completed to obtain an antifouling film with a thickness of 20nm.

[0082] Step 7. After the equipment has cooled down, open the door to release air, and the anti-fouling film for the entire pot of product is completed.

[0083] Step 8: Test the product, including two test standards:

[0084] 1. The water drop angle is tested on a professional water drop angle tester and confirmed to be >110°;

[0085] 2. Friction resistance test: rub 3000 times with a load of 1kg and a speed of 60cycle / min, then test on a water drop angle tester and confirm that it is >100°.

[0086] Confirm that the product is OK.

[0087] Comparative Example 2

[0088] This comparative example adopts Figure 3 The device shown is used to prepare antifouling films. Figure 3 The evaporation container is located on the right side of the evaporation chamber and is opened into the inner wall of the evaporation chamber. The electron gun evaporation (EB) method is adopted. The specific steps are as follows:

[0089] The first step is to place the lens product on the evaporation umbrella stand in the evaporation chamber and make sure it is placed flat and without any abnormalities.

[0090] The second step is to add antifouling agent into the evaporation container.

[0091] The third step is to check whether there are any missing tools or other foreign objects in the evaporation chamber and close the door of the evaporation chamber.

[0092] The fourth step is to use a vacuum pump to evacuate the evaporation chamber to a vacuum level of 2E10. -3 Pa.

[0093] The fifth step is to check the heating component program and confirm that it is correct, then start heating the evaporation container, and at the same time, heat the antifouling agent in the evaporation container to evaporate using electron gun evaporation (EB). The working parameters of electron gun evaporation (EB) of the antifouling agent are: current 2~5mA, time 200s. Electron gun evaporation (EB) is an electron beam under the control of a magnetic field, which hits the top of the waterproofing agent for evaporation. The required current is very small, 2~5mA.

[0094] In the sixth step, the vacuum degree is drawn to the set value to start automatic coating. During the coating process, the evaporation umbrella frame of the evaporation chamber rotates at a speed of 30r / min. The antifouling agent is evaporated and an antifouling film is obtained. The thickness of the antifouling film is 20nm.

[0095] Step 7. After the equipment has cooled down, open the door to release air, and the anti-fouling film for the entire pot of product is completed.

[0096] Step 8: Test the product, including two test standards:

[0097] 1. The water drop angle is tested on a professional water drop angle tester and confirmed to be >110°;

[0098] 2. Friction resistance test: rub 3000 times with a load of 1kg and a speed of 60cycle / min, then test on a water drop angle tester and confirm that it is >100°.

[0099] Confirm that the product is OK.

[0100] The performance test of the antifouling film products prepared in Example 1 and Comparative Examples 1-2 was performed. Data comparison results: When the same brand (Japan Daikin) antifouling agent was used, the water drop angle was shown in Table 1. When the same friction parameters (1 kg load, 3000 frictions, speed 60 cycle / min) were used, the water drop angle was shown in Table 2.

[0101] Table 1 Water drop angle data of antifouling films prepared in Example 1 and Comparative Examples 1-2

[0102]

[0103] Table 2 Water drop angle data of the antifouling films prepared in Example 1 and Comparative Examples 1-2 after the friction resistance was completed

[0104]

[0105] It can be seen from the data in Table 1 and Table 2 that the performance of the antifouling film prepared in Example 1 of the present invention is basically the same as the performance of the antifouling film obtained by conventional coating methods in Comparative Examples 1-2.

[0106] It can be seen from the above embodiments that the present invention provides a method for preparing an antifouling film. Different from the common methods (RH and EB), the present invention adopts an evaporation method in which a conveyor belt transports an evaporation container. The evaporation position is higher and closer to the evaporation umbrella stand of the evaporation chamber, and the evaporation source will move and move slowly and uniformly downward while evaporating.

[0107] The preparation method of the present invention can reduce the waste of antifouling agents, ensure that the amount of antifouling agents plated on ineffective areas is smaller, and when the umbrella frame and lens products rotate at high speed, the deposition amount of antifouling agents at various positions of the products is more uniform.

[0108] The water drop angle effect of the antifouling film obtained by the preparation method provided by the present invention is the same as that of the conventional two methods, and the water drop angle effect after the friction test is also the same, which can meet the conventional industry requirements (water drop angle after plating> 110°, water drop angle after friction test> 100°).

[0109] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A vapor deposition device, characterized in that: include: A vapor deposition chamber (1) is provided with a vapor deposition umbrella frame (2) at the top thereof, wherein the central axis of the vapor deposition umbrella frame (2) is arranged vertically, and the vapor deposition umbrella frame (2) can rotate horizontally around the central axis; A conveyor belt (3) is installed inside the evaporation chamber (1) via a conveyor belt bracket (5); the conveyor belt (3) is obliquely arranged below the evaporation umbrella frame (2); one end of the conveyor belt (3) is close to the central axis of the evaporation umbrella frame (2), and the other end extends downward to below the edge of the evaporation umbrella frame (2); An evaporation container (4) is installed on the conveyor belt (3) and is moved by the conveyor belt (3); an opening is provided at the top of the evaporation container (4); and an evaporation container heater (6) is provided at the bottom of the evaporation container (4); A heating component is used to heat the evaporation chamber (1).

2. The evaporation device according to claim 1, characterized in that: The angle between the conveyor belt (3) and the horizontal plane is 15° to 30°.

3. The evaporation device according to claim 1, characterized in that: The conveyor belt (3) is parallel to a chord (8) corresponding to a generatrix of the curved surface where the vapor deposition umbrella frame (2) is located.

4. The evaporation device according to claim 1, characterized in that: A connecting block (9) is fixedly connected to the inner side wall of the vapor deposition chamber (1), and the conveyor belt bracket (5) is fixedly connected to the connecting block (9) via bolts.

5. A method for preparing an antifouling film, characterized in that: The method is prepared by using the evaporation device according to any one of claims 1 to 4, comprising the following steps: Placing a lens (7) on a vapor deposition umbrella stand (2) in the vapor deposition chamber (1), with the surface of the lens (7) on which the antifouling film is to be prepared facing outwards; Adding an antifouling agent into an evaporation container (4); The evaporation chamber (1) is evacuated, and then the evaporation chamber (1) is heated by a heating component, and the evaporation container (4) is heated by an evaporation container heater (6) until the antifouling agent evaporates; when the antifouling agent begins to evaporate, the evaporation container (4) moves from top to bottom along with the conveyor belt (3), while keeping the evaporation umbrella frame (2) rotating horizontally around its central axis, and evaporating the antifouling agent on the surface of the lens (7); the evaporation container (4) moves to the lowest end of the conveyor belt (3), and the antifouling film is obtained on the surface of the lens (7).

6. The preparation method according to claim 5, characterized in that: The evaporation container (4) moves at a uniform speed along with the conveyor belt (3), and the moving speed of the evaporation container (4) along with the conveyor belt (3) is 5 to 10 cm / min.

7. The preparation method according to claim 5, characterized in that: The evaporation umbrella frame (2) rotates at a uniform speed, and the rotation speed of the evaporation umbrella frame (2) is 20 to 30 r / min.

8. The preparation method according to claim 5, characterized in that: The heating temperature of the evaporation chamber (1) is 75-80°C.

9. The preparation method according to claim 5, characterized in that: The working parameters of the evaporation container heater (6) for heating the evaporation container (4) include: a current of 100 to 200 mA and a time of 250 to 300 seconds.

10. The preparation method according to claim 5, characterized in that: The thickness of the antifouling film is 20-25 nm; the antifouling agent contains fluoride.

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