Preparation process of high-temperature carbonized aerogel-based ultra-black light-absorbing film

Abstract

The invention provides a preparation process of a high-temperature carbonized aerogel-based ultra-black light-absorbing film, and relates to the technical field of light-absorbing film preparation, and the preparation process comprises the following steps: putting dried aerogel on a supporting structure in a heating cavity in a preparation box, introducing inert gas until air is completely exhausted, and sealing a blanking structure through the inert gas, so as to obtain a high-temperature carbonized aerogel-based ultra-black light-absorbing film; the aerogel is heated through the heating structure, so that the aerogel is carbonized under a high-temperature condition; the discharging structure is controlled to be opened through the pushing structure, the supporting structure is driven to rotate through the pushing structure, and aerogel obtained after high-temperature carbonization falls into the grinding structure through the discharging structure. According to the preparation method, the aerogel subjected to high-temperature carbonization has a large number of micropore structures, in the preparation process, powder with regular structures such as nano materials and nanotubes does not need to be synthesized, the preparation difficulty is low, the cost is low, resin is used as a binder, the aerogel can be used on various substrates, and the selectivity requirement for the substrates is not high.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of light-absorbing film preparation, in particular to a high-temperature carbonized aerogel-based super-black light-absorbing film preparation process. BACKGROUND

[0002] The stray light of an optical system refers to the background radiation noise formed by the light rays in the non-imaging field of view reaching the system image plane on the system detector. The stray light in the optical system seriously restricts the imaging performance. The background radiation noise formed by the non-imaging field of view light rays on the detector can significantly reduce the target signal-to-noise ratio, cause imaging blur and contrast attenuation, and thus affect the detection or recognition ability of the entire system. In severe cases, the detected target signal is completely submerged in the stray light background, the system cannot extract the target, or a false signal is formed on the system detector, causing the system to detect a pseudo-target and even leading to the failure of the entire system. Traditional physical and chemical dyeing processes, such as anodic oxidation blackening, multi-arc ion plating black film method and adsorption coloring method, generally have the following disadvantages: 1. high selectivity requirement for the substrate, different process equipment and processes need to be matched according to different sizes of parts, and it is difficult to ensure uniformity; 2. complex process, difficult process operation control and high production cost; 3. organic dyes have the characteristics of aging and fading, which causes the dyed surface to easily change color and poor durability.

[0003] Therefore, the application provides a high-temperature carbonized aerogel-based super-black light-absorbing film preparation process. SUMMARY

[0004] In view of the deficiencies of the prior art, the application aims to provide a high-temperature carbonized aerogel-based super-black light-absorbing film preparation process to solve the problems in the background art. The application can be used on various substrates, has low selectivity requirement for the substrate, does not need to match different process equipment according to different sizes of parts, ensures uniformity, and realizes non-transparency of 8 microns and 60-degree glossiness of only 0.4, so that the light-absorbing effect can be ensured and the durability in use can be improved, thereby reducing the maintenance frequency and the maintenance cost. The uniformity of the heating and carbonization of the aerogel can be ensured, so that the carbonization effect of the aerogel can be ensured and the product quality can be ensured. The aerogel can be ground in the grinding barrel and mixed with the resin material, so that the working efficiency of the device can be further improved, and long-time grinding can ensure the particle size of the product, so that the use effect of the product can be ensured and the production quality of the product can be ensured.

[0005] In order to achieve the above-mentioned purpose, the application is implemented by the following technical scheme: a high-temperature carbonized aerogel-based super-black light-absorbing film preparation process, in which the aerogel is subjected to high-temperature carbonization in a preparation box, and the carbonized aerogel is mixed with other materials and then ground, comprising the following steps:

[0006] S1, the dried aerogel is placed on the support structure in the heating cavity in the preparation box, inert gas is introduced until the air is completely discharged and the discharge structure is sealed by inert gas, the aerogel is heated by the heating structure, so that the aerogel is carbonized under high temperature conditions;

[0007] S2, the discharge structure is opened by the pushing structure, and the support structure is rotated by the pushing structure, the high-temperature carbonized aerogel falls into the grinding structure through the discharge structure, and the high-temperature carbonized aerogel is ground;

[0008] S3, the epoxy resin and polyurethane resin are added by the feeding structure according to a certain proportion, the epoxy resin is mixed with the carbonized aerogel and further ground;

[0009] S4, during the grinding process, the material is sampled through the feeding structure, and the gloss (less than 0.4), resistance (10^4) and optical density (greater than 6) of the material under a certain thickness (5um) are detected;

[0010] S5, the preliminary configuration of the paint is obtained after three hours of grinding, then the proportion of the solvent is adjusted according to the coating process to obtain a suitable viscosity, a slot coater is used for coating, and the coating thickness is adjusted as needed to obtain an ideal product (4-6um);

[0011] The preparation box is provided with a box cover, a heating cavity is formed between the preparation box and the box cover, the support structure in step S1 includes a support frame, the support frame is located in the heating cavity, the pushing structure in step S2 includes a sliding structure and a rotating structure, the sliding structure corresponds to the discharge structure, the rotating structure is provided with an air outlet structure, the rotating structure corresponds to the support frame, the grinding structure in step S2 includes a grinding barrel, a plurality of steel balls are filled in the grinding barrel, and a guide structure is arranged in the grinding barrel.

[0012] Further, the preparation box and the box cover are hinged, a sealing gasket is arranged between the preparation box and the box cover, the heating cavity includes a first cavity formed in the preparation box and a second cavity formed in the box cover, the first cavity corresponds to the second cavity, the support frame is located in the first cavity, a plurality of limiting blocks are fixed in the first cavity and the second cavity, the limiting blocks correspond to the support frame, and a first air inlet pipe is fixed on one side of the preparation box and communicates with the first cavity.

[0013] Further, the sliding structure includes a sliding pipe slidably connected with the preparation box, the rotating structure includes a rotating pipe rotatably fitted in the sliding pipe, one end of the rotating pipe is fixed with a piston plate, an air outlet channel is formed in the rotating pipe, a hose is connected to one end of the rotating pipe, the piston plate corresponds to the first cavity and the second cavity, a plug rod is fixed on the piston plate, and a plug slot is formed on one side of the support frame and corresponds to the plug rod.

[0014] Further, the preparation box is fixed with a first motor, the output end of the first motor is fixed with a first friction head, a second friction head is fixed on the rotating pipe, the second friction head corresponds to the first friction head, the preparation box is fixed with a first electric cylinder, a pushing frame is fixed on the sliding pipe, and the pushing frame is fixedly connected with the output end of the first electric cylinder.

[0015] Further, the blanking structure in the step S1 comprises a blanking opening formed in the preparation box, the blanking opening is communicated with the first cavity, a groove is formed in the preparation box, the groove is communicated with the blanking opening, a blanking plate is slidably arranged in the groove, the blanking plate corresponds to the blanking opening, and a plurality of elastic expansion rods are fixed between the blanking plate and the groove wall.

[0016] Further, the elastic expansion rod comprises a first rod body and a second rod body, the first rod body is slidably connected with the second rod body, a first spring is fixed between the first rod body and the second rod body, an air channel is formed in the preparation box, the air channel is communicated with the elastic expansion rod, and a second air inlet pipe is fixed on one side of the preparation box.

[0017] Further, the other end of the air channel is fixed with a limiting plate, a first blocking block is arranged in the air channel, a plurality of second springs are fixed between the first blocking block and the limiting plate, a push rod is fixed on the pushing frame, and the push rod corresponds to the first blocking block.

[0018] Further, the preparation box is fixed with a second motor, the output end of the second motor is fixedly connected with a grinding barrel, the grinding barrel is communicated with the blanking opening, the feeding structure in the step S3 comprises a feeding pipe, the feeding pipe is fixedly connected with the preparation box, the feeding pipe is rotatably connected with the grinding barrel, a second blocking block is arranged in the feeding pipe, the guide structure comprises a plurality of guide blocks fixed in the grinding barrel, a discharge opening is formed in the bottom of the grinding barrel, a baffle is arranged below the grinding barrel, a rotating shaft is arranged between the baffle and the preparation box, a torsional spring is arranged between the rotating shaft and the preparation box, a plurality of second electric cylinders are fixed in the preparation box, the output end of the second electric cylinder is in contact with the baffle, and a collecting opening is formed in one side of the preparation box.

[0019] Further, the heating structure in the step S1 comprises a plurality of heating pipes fixed in the preparation box and the box cover, the plurality of heating pipes are respectively located on the circumferential side of the heating cavity, a water channel is formed in the preparation box, the water channel is located on the circumferential side of the heating cavity, water inlet pipes and water outlet pipes are respectively fixed on the two sides of the preparation box, and the water inlet pipes and the water outlet pipes are respectively communicated with the two ends of the water channel.

[0020] Further, the components and proportions of the epoxy resin in the step S3 are as follows: D75 accounts for 6.9%, J65 accounts for 14.5%, K35 accounts for 1.2%, CTBN-G accounts for 76.4%, 128 accounts for 1%, the mass of the carbon powder is 50-70% of the resin solid content, 3101G low-temperature curing agent (1-5%) is used; the solvent in the step S5 is selected as butyl ester, DMF or a mixture of the two, and the appropriate proportion is configured according to the drying temperature (80-100 DEG C) and the processing speed (1-10 m / s) of the subsequent process, the dyne value of the thin film is required to be above 48, the addition proportion of the PI low-temperature curing agent is 2.5% of the resin solid content, and the pet needs to additionally use Rvoeo PM-36 primer and the matching curing agent primer.

[0021] The beneficial effects of the present application are as follows:

[0022] 1. The aerogel after high-temperature carbonization has a large number of microporous structures, in the preparation process, it does not need to synthesize powder with regular structure such as nanomaterials and nanotubes, the preparation difficulty is relatively low and the cost is relatively low, and the resin is used as a binder, which can be used on various substrates, the selectivity of the substrate is not high, it is not necessary to match different process equipment according to different sizes of parts, the uniformity is ensured, the final cost is 8 microns, the light transmittance is 0.4, the light absorption effect can be ensured, the durability of use is improved, the maintenance frequency is reduced, and the maintenance cost is reduced.

[0023] 2. The support frame is installed in the heating cavity, the contact area of the aerogel and the inner wall of the heating cavity can be reduced, the heating effect of the aerogel is ensured, the uniformity of the heating and carbonization of the aerogel is ensured, the carbonization effect of the aerogel is ensured, and the product quality is ensured.

[0024] 3. The pushing structure is installed in the preparation box, the opening of the discharging structure can be controlled by the pushing structure, and the aerogel is sent into the grinding barrel, so that the aerogel does not need to be taken out and sent into the grinding structure, the working efficiency of the device is improved, the aerogel can be ground in the grinding barrel and mixed with the resin material, the working efficiency of the device is further improved, and long-time grinding can ensure the particle size of the product, so as to ensure the use effect of the product and the production quality of the product. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a three-dimensional structure schematic view of the assembly of the preparation box in the preparation process of the high-temperature carbonized aerogel-based super-black light-absorbing thin film of the present application;

[0026] Figure 2 It is a three-dimensional structure schematic view of the assembly of the preparation box and the box cover in the preparation process of the high-temperature carbonized aerogel-based super-black light-absorbing thin film of the present application;

[0027] Figure 3 Assembling section structure schematic diagram of preparation box in the preparation process of high-temperature carbonized aerogel-based super-black light-absorbing film;

[0028] Figure 4 As Figure 4 Schematic diagram in A of the middle;

[0029] Figure 5 Assembling section structure schematic diagram of preparation box, grinding barrel in the preparation process of high-temperature carbonized aerogel-based super-black light-absorbing film;

[0030] Figure 6 As Figure 5 Schematic diagram in B of the middle;

[0031] Figure 7 Assembling structure schematic diagram of preparation box, grinding barrel, baffle in the preparation process of high-temperature carbonized aerogel-based super-black light-absorbing film;

[0032] Figure 8 Assembling structure schematic diagram of preparation box, baffle in the preparation process of high-temperature carbonized aerogel-based super-black light-absorbing film;

[0033] Figure 9 As Figure 8 Schematic diagram in C of the middle;

[0034] Figure 10 Assembling structure schematic diagram of first friction head, second friction head in the preparation process of high-temperature carbonized aerogel-based super-black light-absorbing film;

[0035] Figure 11 Assembling three-dimensional structure schematic diagram of support frame in the preparation process of high-temperature carbonized aerogel-based super-black light-absorbing film;

[0036] Figure 12 Assembling three-dimensional structure schematic diagram of pushing frame in the preparation process of high-temperature carbonized aerogel-based super-black light-absorbing film;

[0037] In the figure: 1, preparation box; 2, box cover; 3, first cavity; 4, second cavity; 5, limiting block; 6, first air inlet pipe; 7, second air inlet pipe; 8, support frame; 9, sliding pipe; 10, rotating pipe; 11, air outlet channel; 12, piston plate; 13, insertion rod; 14, insertion slot; 15, first motor; 16, first friction head; 17, second friction head; 18, pushing frame; 19, first electric cylinder; 20, air channel; 21, elastic telescopic rod; 22, first rod body; 23, second rod body; 24, first spring; 25, groove; 26, discharging port; 27, first blocking piece; 28, second spring; 29, limiting plate; 30, push rod; 31, second motor; 32, grinding barrel; 33, feeding pipe; 34, second blocking piece; 35, guide block; 36, blocking plate; 37, discharging port; 38, second electric cylinder; 39, baffle; 40, rotating shaft; 41, collecting port; 42, heating pipe; 43, water channel; 44, water inlet pipe; 45, water outlet pipe. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application will be further described below in conjunction with specific embodiments.

[0039] Please refer to Figures 1 to 12 The present application provides a technical solution: a preparation process of high-temperature carbonized aerogel-based ultra-black light-absorbing film, which comprises the following steps:

[0040] S1, placing the dried aerogel on the support structure in the heating cavity in the preparation box 1, introducing inert gas until the air is completely discharged, and sealing the discharging structure by inert gas, heating the aerogel by the heating structure, and carbonizing the aerogel under high temperature;

[0041] S2, controlling the discharging structure to open by the pushing structure, and rotating the support structure by the pushing structure, the high-temperature carbonized aerogel falling into the grinding structure through the discharging structure, and grinding the high-temperature carbonized aerogel;

[0042] S3, adding epoxy resin and polyurethane resin in a certain proportion by the feeding structure, mixing the epoxy resin with the carbonized aerogel, and further grinding;

[0043] S4, sampling the material through the feeding structure during the grinding process, and detecting the gloss, resistance and optical density of the material under a certain thickness;

[0044] S5, after three hours of grinding, the preliminary configuration of the paint is obtained, then the proportion of solvent is adjusted according to the coating process to obtain the appropriate viscosity, using a slot coater, on-machine coating, adjusting the coating thickness as needed to obtain the ideal product;

[0045] The preparation box 1 is provided with a box cover 2, a heating cavity is formed between the preparation box 1 and the box cover 2, the support structure in step S1 includes a support frame 8 located in the heating cavity, the pushing structure in step S2 includes a sliding structure corresponding to the feeding structure and a rotating structure, the rotating structure is provided with an air outlet structure, and the rotating structure corresponds to the support frame 8, the grinding structure in step S2 includes a grinding barrel 32, a plurality of steel balls are filled in the grinding barrel 32, and the grinding barrel 32 is provided with a guide structure.

[0046] In this embodiment, the preparation box 1 and the box cover 2 are hinged, and a sealing gasket is arranged between the preparation box 1 and the box cover 2. The heating cavity includes a first cavity 3 formed in the preparation box 1 and a second cavity 4 formed in the box cover 2. The first cavity 3 corresponds to the second cavity 4. The support frame 8 is located in the first cavity 3. A plurality of limiting blocks 5 are fixed in the first cavity 3 and the second cavity 4. The limiting blocks 5 correspond to the support frame 8. A first air inlet pipe 6 is fixed on one side of the preparation box 1. The first air inlet pipe 6 communicates with the first cavity 3.

[0047] Specifically, the box cover 2 is turned up, so that the first cavity 3 and the second cavity 4 are separated from each other, so that the dried aerogel can be placed on the support frame 8 in the first cavity 3, and then the box cover 2 is covered, so that the first cavity 3 and the second cavity 4 form a cylindrical cavity, thereby ensuring the uniformity of heating of the aerogel, and supporting the aerogel by the support frame 8 can reduce the contact area of the aerogel and the cavity wall of the first cavity 3, thereby ensuring the heating effect and the uniformity of carbonization of the aerogel, thereby ensuring the quality of the aerogel. Before heating, inert gas is introduced through the first air inlet pipe 6, and then blown out from the air outlet passage 11, so that the residual oxygen in the first cavity 3 and the second cavity 4 can be prevented from causing the aerogel to burn in a high-temperature environment, thereby ensuring the success rate of high-temperature carbonization of the aerogel and the light absorption effect of the product, thereby ensuring the production quality of the product.

[0048] The sliding structure comprises a sliding pipe 9 slidably connected with the preparation box 1, the rotating structure comprises a rotating pipe 10 rotatably fitted in the sliding pipe 9, one end of the rotating pipe 10 is fixed with a piston plate 12, the rotating pipe 10 is provided with an air outlet channel 11, one end of the rotating pipe 10 is connected with a hose, the piston plate 12 corresponds to the first cavity 3 and the second cavity 4, the piston plate 12 is fixed with a plug rod 13, one side of the support frame 8 is provided with a plug slot 14 corresponding to the plug rod 13, one side of the preparation box 1 is fixed with a first motor 15, the output end of the first motor 15 is fixed with a first friction head 16, the rotating pipe 10 is fixed with a second friction head 17 corresponding to the first friction head 16, one side of the preparation box 1 is fixed with a first electric cylinder 19, the sliding pipe 9 is fixed with a pushing frame 18 fixedly connected with the output end of the first electric cylinder 19.

[0049] Specifically, when the material needs to be discharged, the first electric cylinder 19 is started to pull the pushing frame 18, so that the sliding pipe 9 is driven to slide, the rotating pipe 10 is driven to slide to push the piston plate 12 to move, so that the plug rod 13 is inserted into the plug slot 14, and at this time the second friction head 17 is in contact with the first friction head 16, when the discharge port 26 is opened, the first motor 15 is started, the first motor 15 drives the first friction head 16 to rotate, the first friction head 16 and the second friction head 17 are rubbed to drive the second friction head 17 to rotate synchronously, the piston plate 12 is rotated, the support frame 8 is rotated through the plug rod 13, and the high-temperature carbonized aerogel on the support frame 8 naturally falls into the discharge port 26, so that the carbonized aerogel does not need to be manually taken out and fed into other grinding mechanism, thereby greatly improving the work efficiency and reducing the labor cost.

[0050] The discharging structure in step S1 comprises a discharge port 26 provided in the preparation box 1, the discharge port 26 is communicated with the first cavity 3, the preparation box 1 is provided with a groove 25 communicated with the discharge port 26, the groove 25 is slidably fitted with a blocking plate 36 corresponding to the discharge port 26, a plurality of elastic expansion rods 21 are fixed between the blocking plate 36 and the groove wall of the groove 25, the elastic expansion rod 21 comprises a first rod body 22 and a second rod body 23, the first rod body 22 is slidably connected with the second rod body 23, a first spring 24 is fixed between the first rod body 22 and the second rod body 23, the preparation box 1 is provided with an air channel 20 communicated with the elastic expansion rod 21, one side of the preparation box 1 is fixed with a second air inlet pipe 7, the second air inlet pipe 7 is communicated with the first air inlet pipe 6 and an air source through an electric three-way valve, the other end of the air channel 20 is fixed with a limiting plate 29, the air channel 20 is provided with a first blocking block 27, a plurality of second springs 28 are fixed between the first blocking block 27 and the limiting plate 29, a push rod 30 is fixed on the pushing frame 18, the push rod 30 corresponds to the first blocking block 27.

[0051] Specifically, when the inert gas is introduced, the inert gas can be introduced into the air duct 20 through the second air inlet pipe 7 at this time, so that the air pressure in the air duct 20 increases, so that the second rod body 23 is pushed by the larger air pressure, so that the second rod body 23 pushes the blocking plate 36 to block the discharge port 26, at this time the first spring 24 is stretched, when the pusher 18 slides, at this time the pusher 18 drives the push rod 30 to push the first blocking block 27, so that the second spring 28 is stretched, so that at this time a gap is formed between the first blocking block 27 and the air duct 20, so that the inert gas can be discharged, the first spring 24 rebounds to drive the second rod body 23 to reset, so as to pull the blocking plate 36 into the groove 25, so that the discharge port 26 is opened, so as to ensure that the carbonized aerogel can naturally fall into the grinding barrel 32, without manual transfer, thereby reducing labor cost and improving work efficiency.

[0052] The second motor 31 is fixed on one side of the preparation box 1, the output end of the second motor 31 is fixedly connected with the grinding barrel 32, the grinding barrel 32 is communicated with the discharge port 26, and the feeding structure in step S3 includes a feeding pipe 33, the feeding pipe 33 is fixedly connected with the preparation box 1, the feeding pipe 33 is rotatably connected with the grinding barrel 32, the second blocking block 34 is arranged in the feeding pipe 33, the guide structure includes a plurality of guide blocks 35 fixedly arranged in the grinding barrel 32, the bottom of the grinding barrel 32 is provided with a discharge port 37, the lower side of the grinding barrel 32 is provided with a baffle 39, the baffle 39 and the preparation box 1 are provided with a rotating shaft 40, and the rotating shaft 40 and the preparation box 1 are provided with a torsional spring. A plurality of second electric cylinders 38 are fixedly arranged in the preparation box 1, the output end of the second electric cylinder 38 is in contact with the baffle 39, a collecting port 41 is formed on one side of the preparation box 1, and the size of the steel ball is greater than that of the discharge port 26 and the discharge port 37.

[0053] Specifically, after the aerogel enters the grinding barrel 32, the second motor 31 is started, so that the second motor 31 drives the grinding barrel 32 to rotate, so that the steel balls in the grinding barrel 32 collide with the aerogel at high speed, so that the carbonized aerogel is ground. When ground to a certain degree, such as when the particle size of the aerogel is 5 microns, the second blocking block 34 is opened, so that the resin is added into the grinding barrel 32 through the feeding pipe 33. According to the proportion of epoxy resin: D75 is 6.9%, J65 is 14.5%, K35 is 1.2%, CTBN-G is 76.4%, 128 is 1%, 3101G low-temperature curing agent (1-5%) is used, butyl ester is used as a solvent, the drying temperature of the oven is 80 degrees Celsius, and the dyne value of the film is 50.

[0054] The carbon powder is added in a proportion of 60% of the resin solid content, and then the grinding barrel 32 is continuously driven to rotate by the second motor 31, which not only can rotate and mix the aerogel and resin material, but also can further grind the aerogel and resin material. During the grinding process, a part of the sample can be taken out through the feeding pipe 33 for detection in stages, so as to ensure the processing quality. When the grinding is completed, the second electric cylinder 38 is started to push the baffle 39 downward, so that the baffle 39 is inclined, so that the powder is collected from the collecting port 41 after being guided by the baffle 39, ensuring the collection effect, thereby realizing the preliminary configuration of the coating.

[0055] The heating structure in step S1 includes a plurality of heating pipes 42 fixed in the preparation box 1 and the box cover 2, and the plurality of heating pipes 42 are respectively located at the circumferential side of the heating cavity. The preparation box 1 is provided with a water channel 43 at the circumferential side of the heating cavity. The preparation box 1 is respectively fixed with an inlet pipe 44 and an outlet pipe 45 at two sides, and the inlet pipe 44 and the outlet pipe 45 are respectively connected with two ends of the water channel 43.

[0056] Specifically, the circumferential side of the heating cavity can be heated by the heating pipe 42, and the cylindrical cavity can ensure the uniformity of heating, improve the heating efficiency, and ensure the effect of high-temperature carbonization of the aerogel. After carbonization is completed, water can be introduced into the water channel 43 through the inlet pipe 44, which not only can accelerate the cooling efficiency, but also can recycle the heat, thereby improving the working efficiency.

[0057] Work flow: Turn the box cover 2 up, so that the first cavity 3 and the second cavity 4 are separated from each other, so that the dried aerogel can be placed on the support frame 8 in the first cavity 3, then cover the box cover 2, so that the first cavity 3 and the second cavity 4 form a cylindrical cavity, and then inert gas is introduced through the first gas inlet pipe 6, and then blown out from the gas outlet channel 11, so that the residual oxygen in the first cavity 3 and the second cavity 4 can be prevented from causing the aerogel to burn in a high-temperature environment, and the heating pipe 42 heats the circumferential side of the heating cavity, so that the aerogel can be high-temperature carbonized, when the high-temperature carbonization of the aerogel is completed, the first electric cylinder 19 is started, so that the first electric cylinder 19 pulls the push frame 18, so that the sliding pipe 9 is driven to slide, so that the sliding pipe 9 drives the rotating pipe 10 to slide to drive the piston plate 12 to move, so that the plug rod 13 is inserted into the insertion slot 14, at this time the rotating pipe 10 drives the second friction head 17 to contact the first friction head 16, and the push frame 18 drives the push rod 30 to push the first block 27, so that the second spring 28 is stretched, so that a gap is formed between the first block 27 and the air channel 20 at this time, so that the inert gas can be discharged, the first spring 24 rebounds to drive the second rod body 23 to reset, so that the baffle plate 36 is pulled into the recess 25, so that the discharge port 26 is opened, and the first motor 15 is started, so that the first motor 15 drives the first friction head 16 to rotate, so that the first friction head 16 and the second friction head 17 are rubbed to drive the second friction head 17 to rotate synchronously, so that the piston plate 12 rotates, so that the piston plate 12 drives the support frame 8 to rotate through the plug rod 13, so that the high-temperature carbonized aerogel on the support frame 8 falls naturally into the discharge port 26, after the aerogel enters the grinding barrel 32, the second motor 31 is started, so that the second motor 31 drives the grinding barrel 32 to rotate, so that the steel balls in the grinding barrel 32 collide with the aerogel at high speed, so that the carbonized aerogel is ground, when the grinding reaches a certain degree, such as when the particle size of the aerogel is 5 microns, the second block 34 is opened, so that the resin is added into the grinding barrel 32 through the feeding pipe 33, and then the grinding barrel 32 is further rotated by the second motor 31, which not only rotates and mixes the aerogel and resin materials, but also further grinds the aerogel and resin materials, and during the grinding process, a part of the sample can be taken out periodically through the feeding pipe 33 for detection, so as to ensure the processing quality, when the grinding is completed, the second electric cylinder 38 is started, so that the second electric cylinder 38 pushes the baffle plate 39 downward, so that the baffle plate 39 is inclined, so that the powder is collected from the collection port 41 after being guided by the baffle plate 39.

[0058] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A process for preparing a high-temperature carbonized aerogel-based ultra-black light-absorbing thin film, characterized in that, The aerogel is carbonized at high temperature in a preparation chamber, and then the carbonized aerogel is mixed with other materials and ground, including the following steps: S1. Place the dried aerogel onto the support structure in the heating chamber of the preparation box, introduce inert gas until the air is completely expelled, and seal the feeding structure with inert gas. Heat the aerogel through the heating structure to carbonize the aerogel under high temperature conditions. S2. The feeding structure is opened by pushing the structure, and the supporting structure is rotated by pushing the structure. The high-temperature carbonized aerogel falls into the grinding structure through the feeding structure and is then ground. S3. Epoxy resin and polyurethane resin are added in a certain proportion through the feeding structure, and the epoxy resin is mixed with the carbonized aerogel and further ground. S4. During the grinding process, the material is sampled through the feeding structure, and the gloss, resistance and optical density of the material at a certain thickness are detected. Finally, the gloss of the material is less than 0.4, the resistance is 10^4, and the optical density is greater than 6 at a thickness of 5um. S5. After three hours of grinding, the initial formulation of the coating is obtained. Then, the solvent ratio is adjusted according to the coating process to obtain a suitable viscosity. Using a slot coater, the coating is applied. The coating thickness is adjusted as needed to obtain the ideal product. The coating thickness is 4-6 μm. The preparation box is equipped with a lid, and a heating cavity is opened between the preparation box and the lid. The support structure in step S1 includes a support frame, which is located in the heating cavity. The pushing structure in step S2 includes a sliding structure and a rotating structure. The sliding structure corresponds to the feeding structure, and the rotating structure has an air vent structure. The rotating structure corresponds to the support frame. The grinding structure in step S2 includes a grinding barrel, which is filled with multiple steel balls and equipped with a guide structure.

2. The process for preparing a high-temperature carbonized aerogel-based ultra-black light-absorbing thin film according to claim 1, characterized in that: The preparation box is hinged to the lid and a sealing gasket is installed between the preparation box and the lid. The heating chamber includes a first chamber opened in the preparation box and a second chamber opened in the lid. The first chamber and the second chamber correspond to each other. A support frame is located in the first chamber. Multiple limiting blocks are fixed in both the first chamber and the second chamber. The limiting blocks correspond to the support frame. A first air inlet pipe is fixed on one side of the preparation box and is connected to the first chamber.

3. The process for preparing a high-temperature carbonized aerogel-based ultra-black light-absorbing thin film according to claim 2, characterized in that: The sliding structure includes a sliding tube slidably connected to the preparation box, and the rotating structure includes a rotating tube rotatably fitted inside the sliding tube. A piston plate is fixed at one end of the rotating tube, an air outlet channel is opened inside the rotating tube, and a flexible hose is connected to one end of the rotating tube. The piston plate corresponds to the first cavity and the second cavity. An insert rod is fixed on the piston plate, and a slot is opened on one side of the support frame, with the slot corresponding to the insert rod.

4. The process for preparing a high-temperature carbonized aerogel-based ultra-black light-absorbing film according to claim 3, characterized in that: A first motor is fixed to one side of the preparation box, and a first friction head is fixed to the output end of the first motor. A second friction head is fixed to the rotating tube, and the second friction head corresponds to the first friction head. A first electric cylinder is fixed to one side of the preparation box, and a pusher is fixed to the sliding tube. The pusher is fixedly connected to the output end of the first electric cylinder.

5. The process for preparing a high-temperature carbonized aerogel-based ultra-black light-absorbing film according to claim 4, characterized in that: The feeding structure in step S1 includes a feeding port opened in the preparation box, which is connected to the first cavity. A groove is opened in the preparation box, which is connected to the feeding port. A blocking plate is slidably fitted in the groove, which corresponds to the feeding port. Multiple elastic telescopic rods are fixed between the blocking plate and the groove wall.

6. The process for preparing a high-temperature carbonized aerogel-based ultra-black light-absorbing film according to claim 5, characterized in that: The elastic telescopic rod includes a first rod body and a second rod body, which are slidably connected. A first spring is fixed between the first rod body and the second rod body. An air passage is provided inside the preparation box, which is connected to the elastic telescopic rod. A second air inlet pipe is fixed on one side of the preparation box, and the second air inlet pipe is connected to the first air inlet pipe and the air source through an electric three-way valve.

7. The process for preparing a high-temperature carbonized aerogel-based ultra-black light-absorbing thin film according to claim 6, characterized in that: A limiting plate is fixed at the other end of the air passage, a first blocking block is installed inside the air passage, a plurality of second springs are fixed between the first blocking block and the limiting plate, and a push rod is fixed on the push frame, the push rod corresponding to the first blocking block.

8. The process for preparing a high-temperature carbonized aerogel-based ultra-black light-absorbing film according to claim 5, characterized in that: A second motor is fixed to one side of the preparation box. The output end of the second motor is fixedly connected to the grinding barrel. The grinding barrel is connected to the discharge port. The feeding structure in step S3 includes a feeding pipe, which is fixedly connected to the preparation box and rotatably connected to the grinding barrel. A second block is installed inside the feeding pipe. The guiding structure includes multiple guide blocks fixed inside the grinding barrel. A discharge port is opened at the bottom of the grinding barrel. A baffle is installed on the lower side of the grinding barrel. A rotating shaft is installed between the baffle and the preparation box. A torsion spring is installed between the rotating shaft and the preparation box. Multiple second electric cylinders are fixed inside the preparation box. The output end of the second electric cylinder is in contact with the baffle. A collection port is opened on one side of the preparation box.

9. The process for preparing a high-temperature carbonized aerogel-based ultra-black light-absorbing film according to claim 1, characterized in that: The heating structure in step S1 includes multiple heating tubes fixed inside the preparation box and the box cover. The multiple heating tubes are located on the periphery of the heating cavity. A water channel is opened inside the preparation box and is located on the periphery of the heating cavity. An inlet pipe and an outlet pipe are fixed on both sides of the preparation box, and the inlet pipe and the outlet pipe are respectively connected to the two ends of the water channel.

10. The process for preparing a high-temperature carbonized aerogel-based ultra-black light-absorbing thin film according to claim 1, characterized in that: The composition and proportion of epoxy resin in step S3 are as follows: D75 6.9%, J65 14.5%, K35 1.2%, CTBN-G 76.4%, and 128 1%. The mass of carbon powder is 50-70% of the resin solid content. 3101G low-temperature curing agent (1-5%) is used. The solvent selection in step S5 is: butyl acetate, DMF, or a mixture of both. The appropriate proportion is prepared according to the drying temperature (80-100℃) and processing speed (1-10m / s) of the subsequent process. The dyne value of the film is required to be above 48. For PI, the addition ratio of low-temperature curing agent is 2.5% of the resin solid content. For PET, Rvoeo PM-36 primer and a suitable curing agent primer are required.

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