A cleaning liquid and cleaning method for photocuring inner flow channel

Abstract

The invention discloses a cleaning liquid and a cleaning method for a photocurable inner flow channel. The cleaning liquid consists of EA, TPGDA, ethyl acetate, isopropanol, PEG400, KOS110, Tween 80 and coated Fe3O4 magnetic particles. The cleaning method comprises the following steps: mixing EA, TPGDA, ethyl acetate, isopropanol, PEG400, KOS110, Tween 80 and coated Fe3O4 magnetic particles to obtain a cleaning liquid; blowing and washing the inner flow channel through a compressed air air gun nozzle; wrapping a sample to be cleaned to expose the inner flow channel; putting the cleaning liquid and the sample to be cleaned into a distillation bottle, and cleaning them through ultrasonic oscillation and a dynamic magnetic field; blowing and washing the inner flow channel again through a compressed air air nozzle, and drying the sample to be cleaned. After the first air gun blowing, it can be seen with the naked eye that there is still paste remaining in the inner flow channel, after ultrasonic oscillation, it can be clearly observed that the residual paste is dissolved in the cleaning liquid, and after ultrasonic oscillation, the residual paste in the channel can no longer be seen with the naked eye.

Description

Technical Field

[0001] The invention belongs to the technical field of photocuring, and relates to a cleaning liquid and a cleaning method for a photocuring inner flow channel. Background Art

[0002] 3D printing technology, especially photo-curing technology, has become an important part of modern manufacturing. Its advantage lies in the ability to manufacture complex, precise and difficult structures. However, the internal flow channel structure in complex parts has a large aspect ratio, deep penetration depth and poor fluidity of the paste attached to the wall of the internal flow channel, making it extremely difficult to clean.

[0003] The solubility of existing cleaning fluids is low, and it is difficult to remove high-viscosity uncured slurries. They are mainly composed of various types of alcohols and other organic solvents, especially ethanol. From the perspective of cleaning effect, ethanol performs well on ceramic slurries with low solid content. However, with the increase in the amount of ceramic particles added, the static viscosity and shear stress of the slurry increase sharply, and for smaller pores and inner surfaces, ethanol cannot meet its solubility. At the same time, ethanol will cause the expansion of cross-linked polymers in the green body, causing surface blistering and stratification during subsequent processing. In addition, ethanol itself has excessive solubility and volatility. After long-term immersion, it will destroy the surface quality of the green body and cause residual internal stress, resulting in unsatisfactory final surface roughness after sintering. Therefore, a cleaning fluid is needed that can reduce the viscosity of uncured ceramic slurry, and at the same time, is more friendly to the surface of the photocured green body and will not cause further defects.

[0004] In addition, cleaning efficiency is not only related to the cleaning fluid, but also to the cleaning method used. The cleaning method of photocured green bodies requires ensuring good surface quality of the parts. The commonly used cleaning methods are as follows: (1) Immersion cleaning, which is suitable for large-sized parts with simple planes and simple internal structures; (2) Ultrasonic cleaning, which uses high-energy shock waves to separate uncured raw materials from the green body surface. Due to the increase in the interaction area between the cleaning fluid and the surface, the cavitation effect of the ultrasound further improves the cleaning quality, so it is more efficient; (3) Jet cleaning, which mainly uses high-pressure jets with strong shear force, is suitable for cleaning small diameter or curved inner contour holes. However, there is no specific cleaning method for ceramic photocured green bodies made of viscoelastic ceramic slurries with high solid content. By developing effective cleaning processes and cleaning fluids, the further development of photocuring ceramics can be promoted. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a cleaning liquid and a cleaning method for a photocuring inner flow channel. The cleaning liquid and the corresponding method can effectively remove the paste remaining in the inner flow channel of photocuring molded ceramics, thereby solving the technical problem in the prior art that the inner flow channel structure has a large aspect ratio, a deep penetration depth, and the paste with poor fluidity adheres to the wall of the inner flow channel hole, making cleaning extremely difficult.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: The present invention provides a cleaning liquid for a photocurable inner flow channel, characterized in that the components thereof are as follows in terms of mass percentage: EA: 5-7wt% TPGDA: 40-42wt% Ethyl acetate: 25-27wt% Isopropyl alcohol: 20-22wt% PEG400: 1-2wt% KOS110: 3-5wt% Tween 80: 3-5wt% Coated Fe3O4 magnetic particles: 1-3wt%.

[0007] Furthermore, its composition by mass percentage is as follows: EA: 5wt% TPGDA: 40wt% Ethyl acetate: 25wt% Isopropyl alcohol: 20wt% PEG400: 2wt% KOS110: 3wt% Tween 80: 3wt% Coated Fe3O4 magnetic particles: 2wt%.

[0008] Furthermore, the particle size of the coated Fe3O4 magnetic particles is 0.05-0.6 mm.

[0009] A method for cleaning an inner flow channel of a photocurable film, based on the cleaning liquid for the inner flow channel of the photocurable film, comprises the following steps: mixing EA, TPGDA, ethyl acetate, isopropanol, PEG400, KOS110, Tween 80, and coated Fe3O4 magnetic particles to obtain a cleaning liquid; blowing and washing the inner flow channel through a compressed air gun nozzle; wrapping a sample to be cleaned to expose the inner flow channel; placing the cleaning liquid and the sample to be cleaned into a distillation flask, and cleaning them through ultrasonic oscillation and a dynamic magnetic field; blowing and washing the inner flow channel again through a compressed air nozzle, and drying the sample to be cleaned.

[0010] Furthermore, the mixing of EA, TPGDA, ethyl acetate, isopropanol, PEG400, KOS110, Tween 80, and coated Fe3O4 magnetic particles to obtain a cleaning solution comprises the following steps: using a balance to add EA, TPGDA, ethyl acetate, isopropanol, PEG400, KOS110, Tween 80, and coated Fe3O4 magnetic particles into a storage tank according to the above-mentioned mass percentages; using a stirring rod to coarsely mix the materials in the storage tank for 1-3 minutes, and then putting them into a mixer and rapidly stirring them at a speed of 300-500 rpm / min for 60-90 minutes to obtain a cleaning solution.

[0011] Furthermore, the diameter of the compressed air gun nozzle is 5 mm, and the air gun pressure is 0.5-1.0 MPa.

[0012] Furthermore, wrapping the sample to be cleaned to expose the inner flow channel includes: wrapping the surface of the sample to be cleaned with plastic wrap, and piercing the plastic wrap at the openings on both sides of the inner flow channel with a needle.

[0013] Furthermore, the cleaning liquid and the sample to be cleaned are placed in a distillation flask, and are cleaned by ultrasonic oscillation and dynamic magnetic field, including: the cleaning liquid and the sample to be cleaned are placed in a distillation flask, the distillation flask is vacuum treated, and then ultrasonic oscillation and dynamic magnetic field cleaning are performed, and the residual paste flows out from the inner flow channel.

[0014] Furthermore, the ultrasonic oscillation temperature is 25-60°C, and the temperature is 20-30min; the magnetic pole angle of the dynamic magnetic field is 90-180°, and the magnetic flux density is 0-0.4T.

[0015] Furthermore, the drying temperature is 25-60° C., and the drying time is 30-60 min.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention discloses a cleaning method for photocuring internal flow channels. The cleaning liquid and cleaning method of this patent are used to remove residual paste in complex internal flow channels of photocuring molded ceramics, showing remarkable effects, especially for completely removing residual paste inside curved channels with a pore diameter of 1 mm and a penetration depth of 20 mm.

[0017] The present invention discloses a method for cleaning an inner flow channel of a photocurable material. The cleaning liquid of the present patent can penetrate deeply into the inside of a complex and curved channel, effectively dissolve, disperse or flush away residual paste, and ensure that there is no residue inside the channel. After cleaning, the channel boundary is clearly visible, indicating that in the cleaning process, not only the residual paste is removed, but also the integrity and smoothness of the inner flow channel are maintained, which helps to reduce the resistance of the fluid in the channel and improve the fluid transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A flow chart of a method for cleaning a photocurable inner flow channel according to the present invention; Figure 2 A structural model diagram of an inner flow channel of a method for cleaning an inner flow channel of a photocurable material according to the present invention; Figure 3 The present invention is a cross-sectional view of a sample to be cleaned after being cleaned by a method for cleaning an inner flow channel of a light-cured material. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] Example 1 The cleaning liquid for photocuring inner flow channel of the present invention has the following composition in terms of mass percentage: the mass percentage of EA is 5-7wt%, which can be but not limited to 5 , 6 , 7 The mass percentage of TPGDA is 40-42wt%, specifically but not limited to 40 , 41 , 42 The mass percentage of ethyl acetate is 25-27wt%, specifically but not limited to 25 , 26 , 27 The mass percentage of isopropanol is 20-22wt%, specifically but not limited to 20 ,twenty one ,twenty two The mass percentage of PEG400 is 1-2wt%, specifically but not limited to 1 , 2 The mass percentage of KOS110 is 3-5wt%, specifically but not limited to 3 , 4 , 5 The mass percentage of Tween 80 is 3-5wt%, specifically but not limited to 3 , 4 , 5 The mass percentage of the coated Fe3O4 magnetic particles is 1-3wt%, specifically but not limited to 1 , 2 , 3 .

[0021] EA, TPGDA, ethyl acetate, and isopropanol are mainly diluents, PEG400 is a surfactant, KOS110 and Tween 80 are dispersants, and coated Fe3O4 magnetic particles are additives. Among them, EA is ethyl acrylate, TPGDA is tripropylene glycol diacrylate, and PEG400 is polyethylene glycol 400.

[0022] EA has good solubility and volatility, which helps to improve its fluidity and uniformity; TPGDA is used to improve the curing speed and glossiness, ethyl acetate has strong solubility, and isopropyl alcohol has good solubility and volatility and is used for cleaning. PEG400 has good water solubility and wettability, and is often used to improve the dispersibility and stability of the system, and improve the wettability and leveling of the product. KOS110 improves the dispersibility and stability of solid particles in liquids, prevents particle agglomeration and sedimentation, and Tween 80 is used to improve stability and uniformity.

[0023] Among them, the particle size of coated Fe3O4 magnetic particles is 0.05-0.6mm. The size of the particles will significantly affect their physical and chemical properties, such as magnetic responsiveness, sedimentation velocity, specific surface area, etc. For example, smaller particles (close to 0.05mm) usually have a larger specific surface area and may show stronger surface effects and higher reactivity, while larger particles (close to 0.6mm) may have better magnetic separation effects and lower manufacturing costs.

[0024] The preferred cleaning solution is: 5wt% EA, 40wt% TPGDA, 25wt% ethyl acetate, 20wt% isopropanol, 2wt% PEG400, 3wt% KOS110, 3wt% Tween 80, and 2wt% coated Fe3O4 magnetic particles.

[0025] Example 2 The invention discloses a cleaning method for an inner flow channel of a photocurable material, comprising the following steps: mixing EA, TPGDA, ethyl acetate, isopropanol, PEG400, KOS110, Tween 80 and coated Fe3O4 magnetic particles to obtain a cleaning solution; blowing and washing the inner flow channel through a compressed air gun nozzle; wrapping a sample to be cleaned to expose the inner flow channel; placing the cleaning solution and the sample to be cleaned in a distillation bottle, and cleaning them through ultrasonic vibration and a dynamic magnetic field; blowing and washing the inner flow channel again through a compressed air nozzle, and drying the sample to be cleaned.

[0026] Specifically, each component was weighed: EA, TPGDA, ethyl acetate, isopropanol, PEG400, KOS110, Tween 80, and coated Fe3O4 magnetic particles were weighed by mass using a balance and added into a storage tank in sequence.

[0027] Cleaning liquid mixing: Use a stirring rod to stir the materials in the storage tank for 1-3 minutes for rough mixing, then put the storage tank containing the cleaning liquid into the mixer and stir rapidly at a speed of 300-500 rpm / min for 60-90 minutes to obtain the configured cleaning liquid.

[0028] Air gun cleaning: Use the compressed air gun nozzle to aim at one end of the sample to be cleaned and clean it for 1-2 minutes to blow out the easily cleaned residual paste in the inner flow channel. The diameter of the compressed air gun nozzle is 5mm and the air gun pressure is 0.5-1.0Mpa.

[0029] Wrap the sample to be cleaned: Use plastic wrap to wrap the surface of the sample to be cleaned, and use a needle with a diameter of 0.5 mm to pierce the plastic wrap at the openings on both sides of the inner flow channel.

[0030] Cleaning the inner flow channel: put the sample to be cleaned and the prepared cleaning solution into a distillation bottle. The cleaning solution needs to completely cover the sample to be cleaned. Seal the upper end of the distillation bottle, connect the side end to a vacuum pump, turn on the vacuum pump for vacuum treatment, put the distillation bottle into the cleaning machine for ultrasonic vibration for 20-30 minutes, the temperature is 25-60℃, the power of the ultrasonic cleaning machine is 300W, and the dynamic magnetic field assisted cleaning function is turned on at the same time. The magnetic pole angle is 90-180°, and the magnetic flux density is 0-0.4T, so that the magnetic particles can move back and forth in the direction of the inner flow channel to bring the residual paste out of the inner flow channel. Figure 1 shown.

[0031] Air gun cleaning: Use the compressed air gun nozzle to aim at one end of the sample to be cleaned and clean it for 1-2 minutes to blow out the residual paste remaining in the inner flow channel.

[0032] Drying: Dry the cleaned samples at a temperature of 25-60°C for 30-60 minutes. The lower limit of the drying temperature is 25°C to ensure that the temperature is not too low to avoid low drying efficiency, long drying time or incomplete drying. The upper limit of the drying temperature is 60°C to avoid deformation of the samples, aging of the materials or surface damage caused by excessively high temperatures.

[0033] Example 3 The present invention provides a cleaning method for a photocurable inner flow channel, comprising the following steps: Use a balance to weigh EA5wt%, TPGDA40wt%, ethyl acetate 25wt%, isopropanol 20wt%, PEG400 2wt%, KOS110 3wt%, Tween 80 3wt%, and coated Fe3O4 magnetic particles with a particle size of 0.1mm 2wt% according to the mass ratio, and put them into storage tanks respectively.

[0034] The weighed cleaning liquid was stirred for 3 minutes using a stirring rod for rough mixing. After rough mixing, the mixture was put into a mixer and mixed at a speed of 400 rpm / min for 90 minutes to obtain a prepared cleaning liquid.

[0035] Use a compressed air gun nozzle with an air gun pressure of 0.7 MPa and a diameter of 5 mm, aim at one end of the channel of the sample to be cleaned and blow for 2 minutes to blow out some of the easy-to-clean paste in the inner flow channel.

[0036] Use plastic wrap to cover the surface of the sample to be cleaned, and use a needle with a diameter of 0.5 mm to pierce the plastic wrap at the openings of the inner flow channel on both sides to keep the openings of the inner flow channel unobstructed.

[0037] Place the coated sample to be cleaned into a distillation flask, pour the prepared cleaning solution into the distillation flask, and make sure that the cleaning solution level completely covers the sample. Seal the upper end of the distillation flask with a rubber stopper, and connect the side end to a vacuum pump. Turn on the vacuum pump for vacuuming. Place the distillation flask in a cleaning machine for ultrasonic vibration for 20 minutes at a temperature of 25°C and an ultrasonic cleaning power of 300W. At the same time, turn on the dynamic magnetic field auxiliary function with a magnetic pole angle of 150° and a magnetic flux density of 0.1T, so that the magnetic particles move back and forth in the inner flow channel structure to bring the residual paste out of the inner flow channel.

[0038] Aim the compressed air gun nozzle with a pressure of 0.7 MPa and a diameter of 5 mm at one end of the sample to be cleaned and blow it for 2 minutes to blow out the residual paste remaining in the inner flow channel.

[0039] The cleaned samples were dried at 40°C for 60 min.

[0040] In this example, a lot of residual paste was blown out of the ceramic sample after the first air gun cleaning for 2 minutes. It can be seen with the naked eye that there is still residual paste in the inner flow channel, and the inner flow channel is still blocked by the paste; after ultrasonic vibration, it can be clearly observed that the residual paste is dissolved in the cleaning liquid. After ultrasonic vibration for 20 minutes, the residual paste in the channel can no longer be seen by the naked eye; after the second air gun cleaning for 2 minutes, some residual paste was blown out; the cross-section of the sample was cut open to observe the residual paste in the inner flow channel, and it was found that there was basically no residual paste, and each inner flow channel was unobstructed, such as Figure 3 shown.

[0041] Example 4 The present invention provides a cleaning method for a photocurable inner flow channel, comprising the following steps: Use a balance to weigh EA 6wt%, TPGDA 41wt%, ethyl acetate 25wt%, isopropanol 20wt%, PEG 400 1wt%, KOS 110 3wt%, Tween 80 3wt%, and coated Fe 3 O 4 magnetic particles with a particle size of 0.3 mm 1wt% according to the mass ratio, and put them into storage tanks respectively.

[0042] The weighed cleaning liquid was stirred for 2 minutes using a stirring rod for rough mixing. After rough mixing, the mixture was put into a mixer and mixed at a speed of 500 rpm / min for 75 minutes to obtain a prepared cleaning liquid.

[0043] Use a compressed air gun nozzle with a pressure of 0.5 MPa and a diameter of 5 mm to blow at one end of the channel of the sample to be cleaned for 1 minute to blow out some of the easy-to-clean paste in the inner flow channel. Figure 2 shown.

[0044] Use plastic wrap to cover the surface of the sample to be cleaned, and use a needle with a diameter of 0.5 mm to pierce the plastic wrap at the openings of the inner flow channel on both sides to keep the openings of the inner flow channel unobstructed.

[0045] Place the coated sample to be cleaned into a distillation flask, pour the prepared cleaning solution into the distillation flask, and make sure that the cleaning solution level completely covers the sample. Seal the upper end of the distillation flask with a rubber stopper, and connect the side end to a vacuum pump. Turn on the vacuum pump for vacuuming. Place the distillation flask in a cleaning machine for ultrasonic vibration for 25 minutes at a temperature of 40°C and an ultrasonic cleaning power of 300W. At the same time, turn on the dynamic magnetic field auxiliary function with a magnetic pole angle of 120° and a magnetic flux density of 0.2T, so that the magnetic particles move back and forth in the inner flow channel structure to bring the residual paste out of the inner flow channel.

[0046] Aim the compressed air gun nozzle with a pressure of 0.5 MPa and a diameter of 5 mm at one end of the sample to be cleaned and blow it for 1 minute to blow out the residual paste remaining in the inner flow channel.

[0047] The cleaned samples were dried at a temperature of 30°C for 60 min.

[0048] In this example, a small amount of residual paste was blown out of the ceramic sample after the first air gun cleaning for 1 minute. It can be seen with the naked eye that there is still paste remaining in the inner flow channel, and the inner flow channel is still blocked by the paste; after ultrasonic vibration, it can be obviously observed that the residual paste is dissolved in the cleaning liquid. After being taken out after ultrasonic vibration for 25 minutes, the residual paste in the channel can no longer be seen by the naked eye; after the second air gun cleaning for 1 minute, some residual paste was blown out; the cross-section of the sample was cut open to observe the residual paste in the inner flow channel, and it was found that there was basically no residual paste and all inner flow channels were unobstructed.

[0049] Example 5 The present invention provides a cleaning method for a photocurable inner flow channel, comprising the following steps: Use a balance to weigh EA 5wt%, TPGDA 40wt%, ethyl acetate 27wt%, isopropanol 20wt%, PEG 400 1wt%, KOS 110 3wt%, Tween 80 3wt%, and coated Fe 3 O 4 magnetic particles with a particle size of 0.06 mm 1wt% according to the mass ratio, and put them into storage tanks respectively.

[0050] The weighed cleaning liquid was stirred for 1 min using a stirring rod for rough mixing. After rough mixing, the mixture was put into a mixer and mixed at a speed of 300 rpm / min for 60 min to obtain a prepared cleaning liquid.

[0051] Use a compressed air gun nozzle with an air gun pressure of 1 MPa and a diameter of 5 mm, aim at one end of the channel of the sample to be cleaned and blow for 2 minutes to blow out some of the easy-to-clean paste in the inner flow channel.

[0052] Use plastic wrap to cover the surface of the sample to be cleaned, and use a needle with a diameter of 0.5 mm to pierce the plastic wrap at the openings of the inner flow channel on both sides to keep the openings of the inner flow channel unobstructed.

[0053] Place the coated sample to be cleaned into a distillation flask, pour the prepared cleaning solution into the distillation flask, and make sure that the cleaning solution level completely covers the sample. Seal the upper end of the distillation flask with a rubber stopper, and connect the side end to a vacuum pump. Turn on the vacuum pump for vacuuming. Place the distillation flask in a cleaning machine for ultrasonic vibration for 30 minutes at a temperature of 60°C and an ultrasonic cleaning power of 300W. At the same time, turn on the dynamic magnetic field auxiliary function with a magnetic pole angle of 90° and a magnetic flux density of 0.3T, so that the magnetic particles move back and forth in the inner flow channel structure to bring the residual paste out of the inner flow channel.

[0054] Aim the compressed air gun nozzle with an air gun pressure of 1 MPa and a diameter of 5 mm at one end of the sample to be cleaned, and blow it for 2 minutes to blow out the residual paste remaining in the inner flow channel.

[0055] The cleaned samples were dried at a temperature of 60°C for 30 min.

[0056] In this example, a lot of residual paste was blown out of the ceramic sample after the first air gun cleaning for 2 minutes. It can be seen with the naked eye that there is still paste remaining in the inner flow channel, and the inner flow channel is not completely blocked by the paste; after ultrasonic vibration, it can be obviously observed that the residual paste is dissolved in the cleaning liquid. After being taken out after ultrasonic vibration for 30 minutes, the residual paste in the channel can no longer be seen by the naked eye; after the second air gun cleaning for 2 minutes, a small amount of residual paste was blown out; the cross-section of the sample was cut open to observe the residual paste in the inner flow channel, and it was found that there was basically no residual paste and all inner flow channels were unobstructed.

[0057] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

Claims

1. A cleaning liquid for a photocurable inner flow channel, characterized in that: The composition by mass percentage is as follows: EA: 5-7wt% TPGDA: 40-42wt% Ethyl acetate: 25-27wt% Isopropyl alcohol: 20-22wt% PEG400: 1-2wt% KOS110: 3-5wt% Tween 80: 3-5wt% Coated Fe3O4 magnetic particles: 1-3wt%.

2. The cleaning liquid for photocuring inner flow channel according to claim 1, characterized in that: Its composition by mass percentage is as follows: EA: 5wt% TPGDA: 40wt% Ethyl acetate: 25wt% Isopropyl alcohol: 20wt% PEG400: 2wt% KOS110: 3wt% Tween 80: 3wt% Coated Fe3O4 magnetic particles: 2wt%.

3. The cleaning liquid for photocuring inner flow channel according to claim 1, characterized in that: The particle size of the coated Fe3O4 magnetic particles is 0.05-0.6 mm.

4. A method for cleaning a light-cured inner flow channel, characterized in that: The cleaning liquid for photocuring inner flow channel according to any one of claims 1 to 3 comprises the following steps: The cleaning solution is obtained by mixing EA, TPGDA, ethyl acetate, isopropanol, PEG400, KOS110, Tween 80 and coated Fe3O4 magnetic particles; Blow and clean the inner flow channel through the compressed air gun nozzle; Wrap the sample to be cleaned to expose the inner flow channel; The cleaning liquid and the sample to be cleaned are placed in a distillation flask and cleaned by ultrasonic vibration and dynamic magnetic field; The inner flow channel is blown clean again through the compressed air nozzle to dry the sample to be cleaned.

5. The cleaning method for the photocuring inner flow channel according to claim 4, characterized in that: The step of mixing EA, TPGDA, ethyl acetate, isopropanol, PEG400, KOS110, Tween 80, and coated Fe3O4 magnetic particles to obtain a cleaning solution comprises the following steps: Using a balance, EA, TPGDA, ethyl acetate, isopropanol, PEG400, KOS110, Tween 80, and coated Fe3O4 magnetic particles were added to the storage tank according to the above mass percentages; Use a stirring rod to roughly mix the material in the storage tank for 1-3 minutes, then put it into the mixer and stir it rapidly at a speed of 300-500 rpm / min for 60-90 minutes to obtain a cleaning solution.

6. The cleaning method for the photocuring inner flow channel according to claim 4, characterized in that: The diameter of the compressed air gun nozzle is 5 mm, and the air gun pressure is 0.5-1.0 MPa.

7. The cleaning method for the photocuring inner flow channel according to claim 6, characterized in that: The step of wrapping the sample to be cleaned to expose the inner flow channel comprises: Use plastic wrap to wrap the surface of the sample to be cleaned, and use a needle to pierce the plastic wrap at the openings on both sides of the inner flow channel.

8. The cleaning method for the photocuring inner flow channel according to claim 7, characterized in that: The cleaning liquid and the sample to be cleaned are placed in a distillation bottle, and the cleaning is performed by ultrasonic vibration and dynamic magnetic field, including: The cleaning liquid and the sample to be cleaned are placed in a distillation flask, and the distillation flask is vacuum treated and then subjected to ultrasonic oscillation and dynamic magnetic field cleaning, and the residual paste flows out from the inner flow channel.

9. The cleaning method for the photocuring inner flow channel according to claim 8, characterized in that: The ultrasonic oscillation temperature is 25-60°C, and the temperature is 20-30min; The magnetic pole angle of the dynamic magnetic field is 90-180°, and the magnetic flux density is 0-0.4T.

10. The cleaning method for the photocuring inner flow channel according to claim 4, characterized in that: The drying temperature is 25-60° C., and the drying time is 30-60 min.

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