Preparation method of oxygen-enriched composite membrane, oxygen-enriched composite membrane and application

Abstract

The embodiment of the invention discloses a preparation method of an oxygen-enriched composite membrane, the oxygen-enriched composite membrane and application. A specific embodiment of the method comprises the following steps: 1, 1, 3, 3, 5, 5-hexamethyltrisiloxane and diallyl maleate are subjected to mixing treatment, and the mass ratio of the 1, 1, 3, 3, 5, 5-hexamethyltrisiloxane to the diallyl maleate is 1: (2-4); a first platinum catalyst is added, an intermediate product is obtained, and the side chain of the intermediate product contains vinyl; the second mixture, normal hexane and a second platinum catalyst are mixed, the second mixture is a mixture composed of an intermediate product and 1, 1, 3, 3-tetramethyldisiloxane, and the mass ratio of the intermediate product to the 1, 1, 3, 3-tetramethyldisiloxane is 1: (0.4-0.5); carrying out viscosity detection treatment on the polymer solution; and coating the polymer solution on the surface of the base membrane. According to the embodiment, the oxygen enrichment performance and the service life of the oxygen-enriched composite membrane can be improved.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the field of membrane preparation and membrane separation technology, and specifically to a method for preparing an oxygen-rich composite membrane, an oxygen-rich composite membrane and uses thereof. Background Art

[0002] Oxygen-enriched membranes can selectively allow oxygen molecules to pass through while blocking other gas molecules, thereby achieving gas separation and enrichment. Oxygen-enriched membranes are widely used in many fields such as industry and energy. For example, in the energy field, oxygen-enriched membranes can be used to improve combustion efficiency, reduce fuel consumption and pollutant emissions; in industrial production, oxygen-enriched membranes can be used for air separation and extract high-purity oxygen for industrial production. At present, when preparing oxygen-enriched membranes, the commonly used method is to use polydimethylsiloxane (PDMS) or polyimide (PI) as the material for making oxygen-enriched membranes.

[0003] However, it is found in practice that when the above method is used to prepare oxygen-enriched membranes, the following technical problems often occur: the characteristics of the PDMS material itself limit its ultimate performance of oxygen-enriched separation, and the mechanical strength of the PDMS material is poor, resulting in a short service life of the oxygen-enriched membrane; the PI membrane is a hydrophilic membrane, and under conditions of high humidity, more water enters the oxygen-enriched membrane and blocks the oxygen permeation channel, thereby causing the oxygen-enriched performance of the oxygen-enriched membrane to decrease.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the inventive concept and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Summary of the invention

[0005] The content of this disclosure is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this disclosure is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0006] Some embodiments of the present disclosure propose a method for preparing an oxygen-rich composite membrane, an oxygen-rich composite membrane and uses thereof to solve the technical problems mentioned in the above background technology section.

[0007] In a first aspect, some embodiments of the present disclosure provide a method for preparing an oxygen-rich composite membrane, the method comprising: mixing 1,1,3,3,5,5-hexamethyltrisiloxane with diallyl maleate to obtain a first mixture, wherein the mass ratio of the above-mentioned 1,1,3,3,5,5-hexamethyltrisiloxane to the above-mentioned diallyl maleate is 1:(2-4); adding a first platinum catalyst to the above-mentioned first mixture to carry out a cross-linking reaction to obtain an intermediate product, wherein the side chain of the above-mentioned intermediate product contains a vinyl group; mixing a second mixture, n-hexane and a second platinum catalyst to carry out a cross-linking reaction to obtain a polymer solution, wherein the above-mentioned second mixture is a mixture of the above-mentioned intermediate product and 1,1,3,3-tetramethyldisiloxane, and the mass ratio of the above-mentioned intermediate product to the above-mentioned 1,1,3,3-tetramethyldisiloxane is 1:(0.4-0.5); performing a viscosity detection process on the above-mentioned polymer solution to obtain the viscosity of the polymer solution; according to the above-mentioned polymer solution viscosity, the above-mentioned polymer solution is coated on the surface of the prepared base film to obtain an oxygen-rich composite membrane.

[0008] Optionally, the mass ratio of the n-hexane to the second mixture is (10-12):1.

[0009] Optionally, the amount of the second platinum catalyst is 0.1% to 0.5% of the mass of the second mixture.

[0010] Optionally, the amount of the first platinum catalyst is 0.1% to 0.5% of the mass of the first mixture.

[0011] Optionally, the material of the base film includes at least one of the following: polyvinylidene fluoride, polyetherimide, polyacrylonitrile, and polysulfone.

[0012] Optionally, the first platinum catalyst and the second platinum catalyst are chloroplatinic acid-vinylsiloxane complexes.

[0013] Optionally, the mixing of the second mixture, n-hexane and the second platinum catalyst for cross-linking reaction to obtain a polymer solution comprises: mixing the second mixture, n-hexane and the second platinum catalyst by a water bath method for cross-linking reaction to obtain a polymer solution, wherein the water bath temperature ranges from 30°C to 60°C.

[0014] Optionally, according to the viscosity of the polymer solution, the polymer solution is coated on the surface of a prepared base film to obtain an oxygen-rich composite membrane, including: inputting the viscosity of the polymer solution into a preset coating speed generation model to obtain a coating speed; according to the coating speed, coating the polymer solution on the surface of a prepared base film to obtain an oxygen-rich composite membrane.

[0015] In a second aspect, some embodiments of the present disclosure provide an oxygen-rich composite membrane, wherein the oxygen-rich composite membrane is prepared by the method for preparing an oxygen-rich composite membrane as described in any implementation of the first aspect.

[0016] In a third aspect, some embodiments of the present disclosure provide a use of an oxygen-rich composite membrane as described in any implementation of the first aspect above, wherein the oxygen-rich composite membrane is used in an oxygen-rich combustion system and a portable oxygen-rich device.

[0017] The above-mentioned various embodiments of the present disclosure have the following beneficial effects: through the preparation method of the oxygen-enriched composite membrane of some embodiments of the present disclosure, the oxygen-enriched performance and service life of the oxygen-enriched composite membrane can be improved. Specifically, the reasons for the short service life of the oxygen-enriched membrane and the reduced oxygen-enriched performance are: the characteristics of the PDMS material itself limit its limit performance of oxygen-enriched separation, and the mechanical strength of the PDMS material is poor, resulting in a short service life of the oxygen-enriched membrane; the PI membrane is a hydrophilic membrane, and under conditions of high humidity, more water enters the oxygen-enriched membrane and blocks the oxygen permeation channel, thereby causing the oxygen-enriched performance of the oxygen-enriched membrane to decrease. Based on this, the preparation method of the oxygen-enriched composite membrane of some embodiments of the present disclosure, first, 1,1,3,3,5,5-hexamethyltrisiloxane and diallyl maleate are mixed to obtain a first mixture, wherein the mass ratio of the above-mentioned 1,1,3,3,5,5-hexamethyltrisiloxane to the above-mentioned diallyl maleate is 1: (2-4); a first platinum catalyst is added to the above-mentioned first mixture to carry out a cross-linking reaction to obtain an intermediate product, wherein the side chain of the above-mentioned intermediate product contains vinyl. Thus, an intermediate product with vinyl groups can be obtained, which can be used to improve the adhesion between the polymer solution and the base film. Secondly, under preset temperature conditions, the second mixture, n-hexane and the second platinum catalyst are mixed to perform a cross-linking reaction to obtain a polymer solution, wherein the second mixture is a mixture of the intermediate product and 1,1,3,3-tetramethyldisiloxane, and the mass ratio of the intermediate product to the 1,1,3,3-tetramethyldisiloxane is 1:(0.4-0.5). Thus, a highly cross-linked polymer network structure can be obtained, thereby improving the mechanical strength and durability of the oxygen-enriched composite membrane. The above polymer solution is subjected to a viscosity detection process to obtain the viscosity of the polymer solution; according to the viscosity of the above polymer solution, the above polymer solution is coated on the surface of the prepared base film to obtain an oxygen-enriched composite membrane. Thus, an oxygen-enriched composite membrane with a denser network structure and higher mechanical properties can be obtained, thereby improving the service life and oxygen-enriched performance of the oxygen-enriched composite membrane. Also, because hexamethyltrisiloxane and diallyl maleate contain vinyl groups on the side chains of the intermediate products under the action of the catalyst, and the density of the cross-linked network structure is improved through the secondary cross-linking reaction, thereby improving the oxygen permeability and structural stability of the oxygen-enriched composite membrane, thereby improving the service life and oxygen-enrichment performance of the oxygen-enriched composite membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that components and elements are not necessarily drawn to scale.

[0019] Figure 1 is a flow chart of some embodiments of the method for preparing an oxygen-enriched composite membrane according to the present disclosure;

[0020] Figure 2 is a test product picture of an oxygen-rich composite membrane according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0021] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0022] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0023] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0024] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0025] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0026] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0027] Figure 1 The process 100 of some embodiments of the method for preparing an oxygen-enriched composite membrane according to the present disclosure is shown. The method for preparing an oxygen-enriched composite membrane comprises the following steps:

[0028] Step 101: Mix 1,1,3,3,5,5-hexamethyltrisiloxane and diallyl maleate to obtain a first mixture.

[0029] In some embodiments, 1,1,3,3,5,5-hexamethyltrisiloxane and diallyl maleate may be mixed to obtain a first mixture, wherein the mass ratio of the 1,1,3,3,5,5-hexamethyltrisiloxane to the diallyl maleate is 1:(2-4).

[0030] Step 102: Add a first platinum catalyst into the first mixture to perform a cross-linking reaction to obtain an intermediate product.

[0031] In some embodiments, a first platinum catalyst may be added to the first mixture to perform a cross-linking reaction to obtain an intermediate product. Wherein, the side chain of the intermediate product contains vinyl. The first platinum catalyst may be a catalyst made with metal platinum as the main active component. In practice, the first platinum catalyst may be added to the first mixture and stirred with a stirring rod to perform a cross-linking reaction to obtain an intermediate product.

[0032] Optionally, the amount of the first platinum catalyst is 0.1% to 0.5% of the mass of the first mixture. Thus, by controlling the amount of the catalyst, the effect of the catalyst residue on the performance of the oxygen-enriched composite membrane can be reduced while ensuring the efficient cross-linking reaction.

[0033] Step 103 , mixing the second mixture, n-hexane and the second platinum catalyst to perform a cross-linking reaction to obtain a polymer solution.

[0034] In some embodiments, the second mixture, n-hexane and the second platinum catalyst may be mixed to perform a crosslinking reaction to obtain a polymer solution. The second mixture may be a mixture of the intermediate product and 1,1,3,3-tetramethyldisiloxane. The mass ratio of the intermediate product to the 1,1,3,3-tetramethyldisiloxane is 1:(0.4-0.5).

[0035] Optionally, the mass ratio of the n-hexane to the second mixture may be (10-12): 1. Thus, the uniformity and stability of the secondary cross-linking reaction may be improved.

[0036] Optionally, the amount of the second platinum catalyst is 0.1% to 0.5% of the mass of the second mixture.

[0037] Optionally, the first platinum catalyst and the second platinum catalyst may be chloroplatinic acid-vinylsiloxane complexes.

[0038] In some optional implementations of some embodiments, the second mixture, n-hexane and the second platinum catalyst can be mixed by a water bath method to perform a cross-linking reaction to obtain a polymer solution. The water bath temperature range can be 30° C. to 60° C. The water bath temperature range can be a range of water bath temperatures. The water bath temperature can be the temperature of a water bath pot. Thus, the stability of the reaction can be improved while promoting the cross-linking reaction.

[0039] Step 104: Perform viscosity detection processing on the polymer solution to obtain the viscosity of the polymer solution.

[0040] In some embodiments, the polymer solution may be subjected to a viscosity detection process to obtain the viscosity of the polymer solution. The viscosity of the polymer solution may be the viscosity of the polymer solution. In practice, the viscosity of the polymer solution may be subjected to a viscosity detection process by a viscometer at intervals of a first preset time length to obtain the viscosity of the polymer solution. The first preset time length may be a pre-set time length. For example, the first preset time length may be 10 minutes.

[0041] Step 105 , coating the polymer solution on the surface of the prepared base film according to the viscosity of the polymer solution to obtain an oxygen-rich composite film.

[0042] In some embodiments, the polymer solution can be applied to the surface of the prepared base film according to the viscosity of the polymer solution to obtain an oxygen-enriched composite film. Wherein, the base film can be a multifunctional thin film material made of a variety of polymer materials. In practice, first, when it is determined that the viscosity of the polymer solution meets the preset viscosity condition, the polymer solution can be applied to the surface of the prepared base film according to the preset coating speed. Wherein, the preset viscosity condition can be that the polymer solution viscosity is within the preset polymer solution viscosity range. The preset polymer solution viscosity range can be a preset range of viscosities that characterize the easy adhesion of the polymer solution to the base film. For example, the preset polymer solution viscosity range can be 50 to 60 mPa·s (milliPascals·seconds). The preset coating speed can be a preset coating speed. For example, the preset coating speed can be 0.5 m / min (meters / minute). Then, the coated base film is placed in an oven for a second preset time to obtain an oxygen-enriched composite film. Wherein, the second preset time can be a preset time. For example, the second preset time can be 4 hours or 5 hours. The temperature of the oven may range from 100 to 120°C.

[0043] Optionally, the material of the base film may include but is not limited to at least one of the following: polyvinylidene fluoride (PVDF), polyetherimide (PEI), polyacrylonitrile (PAN), and polysulfone (PSF).

[0044] In some optional implementations of some embodiments, the above-mentioned polymer solution can be applied to the surface of the prepared base film according to the viscosity of the above-mentioned polymer solution to obtain an oxygen-rich composite film by the following steps: the first step is to input the viscosity of the above-mentioned polymer solution into a preset film coating speed generation model to obtain a film coating speed. Among them, the above-mentioned preset film coating speed generation model can be a film coating speed generation model obtained by pre-training. The above-mentioned preset film coating speed generation model can be a linear function with the viscosity of the polymer solution as input and the film coating speed as output. It should be noted that the greater the viscosity of the polymer solution, the smaller the film coating speed. As an example, when the viscosity of the polymer solution is 10mPa·s, the film coating speed can be 1m / min. As another example, when the viscosity of the polymer solution is 8mPa·s, the film coating speed can be 1.5m / min.

[0045] In the second step, the polymer solution is coated on the surface of the prepared base film at the coating speed to obtain an oxygen-rich composite film.

[0046] Therefore, when the viscosity of the polymer solution is low, the coating speed can be increased, thereby reducing the phenomenon of dripping at the blade head. When the viscosity of the polymer solution is high, the coating speed can be reduced, thereby reducing the accumulation and cross-linking of the coating liquid at the blade edge and the contact area between the blade edge and the base membrane, thereby improving the uniformity of the surface of the oxygen-enriched composite membrane.

[0047] The present disclosure is further illustrated in the following examples. It should be understood that although these examples indicate certain aspects of the present invention, they are given by way of illustration only. From the above discussion and these examples, those skilled in the art can determine the essential characteristics of the disclosed embodiments, and various changes and modifications can be made to adapt the disclosed embodiments to a variety of uses and conditions without departing from the spirit and scope of the disclosed embodiments.

[0048] Example 1

[0049] First, 1,1,3,3,5,5-hexamethyltrisiloxane and diallyl maleate were fully mixed at a mass ratio of 1:2 to obtain a first mixture.

[0050] Then, a first platinum catalyst is added to the first mixture and stirred by a stirring rod to perform a crosslinking reaction to obtain an intermediate product containing vinyl groups in the side chain. The amount of the first platinum catalyst added is 0.1% of the total mass of 1,1,3,3,5,5,-hexamethyltrisiloxane and diallyl maleate.

[0051] Afterwards, the intermediate product was mixed with 1,1,3,3-tetramethyldisiloxane at a mass ratio of 1:0.4, and n-hexane was added as a solvent, and then a second platinum catalyst was added to cause a cross-linking reaction at a water bath temperature of 30° C. The amount of n-hexane added was 10 times the mass of the second mixture, and the amount of the second platinum catalyst used was 0.1% of the mass of the second mixture.

[0052] Next, the viscosity of the polymer solution was measured by a viscometer at intervals of 10 minutes to obtain the viscosity of the polymer solution.

[0053] Finally, when the viscosity of the polymer solution reached 50 mPa·s, the membrane solution was coated on the surface of the PVDF base membrane and cross-linked at an oven temperature of 100° C. for 4 hours to obtain an oxygen-enriched composite membrane.

[0054] Example 2

[0055] First, 1,1,3,3,5,5-hexamethyltrisiloxane and diallyl maleate were fully mixed at a mass ratio of 1:3 to obtain a first mixture.

[0056] Then, a first platinum catalyst is added to the first mixture and stirred by a stirring rod to perform a crosslinking reaction to obtain an intermediate product containing vinyl groups in the side chain. The amount of the first platinum catalyst added is 0.3% of the total mass of 1,1,3,3,5,5,-hexamethyltrisiloxane and diallyl maleate.

[0057] Afterwards, the intermediate product was mixed with 1,1,3,3-tetramethyldisiloxane at a mass ratio of 1:0.45, and n-hexane was added as a solvent, and then a second platinum catalyst was added to cause a cross-linking reaction at a water bath temperature of 40° C. Among them, the amount of n-hexane added was 11 times the mass of the second mixture, and the amount of the second platinum catalyst used was 0.3% of the mass of the second mixture.

[0058] Next, the viscosity of the polymer solution was measured by a viscometer at intervals of 10 minutes to obtain the viscosity of the polymer solution.

[0059] Finally, when the viscosity of the polymer solution reached 55 mPa·s, the membrane solution was coated on the surface of the PVDF base membrane and cross-linked at an oven temperature of 110° C. for 5 hours to obtain an oxygen-enriched composite membrane.

[0060] Example 3

[0061] First, 1,1,3,3,5,5-hexamethyltrisiloxane and diallyl maleate were fully mixed at a mass ratio of 1:4 to obtain a first mixture.

[0062] Then, a first platinum catalyst is added to the first mixture and stirred by a stirring rod to perform a crosslinking reaction to obtain an intermediate product containing vinyl groups in the side chain. The amount of the first platinum catalyst added is 0.5% of the total mass of 1,1,3,3,5,5,-hexamethyltrisiloxane and diallyl maleate.

[0063] Afterwards, the intermediate product was mixed with 1,1,3,3-tetramethyldisiloxane at a mass ratio of 1:0.5, and n-hexane was added as a solvent, and then a second platinum catalyst was added to cause a cross-linking reaction at a water bath temperature of 40° C. The amount of n-hexane added was 12 times the mass of the second mixture, and the amount of the second platinum catalyst used was 0.5% of the mass of the second mixture.

[0064] Next, the viscosity of the polymer solution was measured by a viscometer at intervals of 10 minutes to obtain the viscosity of the polymer solution.

[0065] Finally, when the viscosity of the polymer solution reached 60 mPa·s, the membrane solution was coated on the surface of the PVDF base membrane and cross-linked at an oven temperature of 120° C. for 6 hours to obtain an oxygen-enriched composite membrane.

[0066] In order to demonstrate the effect of the oxygen-enriched composite membrane prepared by the above oxygen-enriched composite membrane preparation method, the following experimental methods and experimental results are provided.

[0067] Experiment 1

[0068] The gas separation performance test was performed on each oxygen-rich composite membrane, conventional PDMS membrane and PI membrane corresponding to Example 1, Example 2 and Example 3 using a small test membrane device. The specific steps are as follows:

[0069] In the first step, air is passed into the membrane module, and the permeate fluxes of the oxygen-rich composite membrane, conventional PDMS membrane and PI membrane corresponding to each embodiment are measured at 0.45 MPa (megapascal) by using a gas flow meter in a small test membrane equipment.

[0070] In the second step, the oxygen concentration on each permeate side of the oxygen-rich composite membrane, conventional PDMS membrane and PI membrane was measured by using an oxygen concentration analyzer in a small test membrane equipment.

[0071] It should be noted that the test areas of the oxygen-enriched composite membranes, conventional PDMS membranes and PI membranes in Examples 1, 2 and 3 are the same.

[0072] The experimental results are shown in the following table. As can be seen from the table below, the oxygen-enriched composite membranes of Example 1, Example 2, and Example 3 have greatly improved oxygen-enriched performance on the permeate side compared with the conventional PDMS membrane, but under conventional air conditions, although the permeate flux of each oxygen-enriched composite membrane is more than 10 times higher than that of the PI membrane, and has a higher flux advantage during use, its oxygen-enriched concentration is still lower than that of the PI membrane.

[0073]

[0074]

[0075] Experiment 2

[0076] The small test membrane equipment and the small humidifier were connected through a three-way valve to humidify the air, and the air humidity was measured using an air humidity meter. Then, the oxygen-enriched composite membrane and the PI membrane corresponding to Example 3 were tested for gas separation performance under different air humidity conditions. The test steps were the same as those of Experiment 1 and will not be repeated here.

[0077] The experimental results are shown in the following table. As can be seen from the table below, because the PI membrane is a hydrophilic membrane, under conditions of high humidity, it blocks the oxygen permeation channel due to its hydrophilicity, and its oxygen enrichment performance decreases rapidly while the flux decreases rapidly. However, because Example 3 is a hydrophobic membrane, it is less affected by air humidity and has greater application potential and a wider range of regional applications in actual industrial applications.

[0078]

[0079] When adopting technical solutions to solve the technical problems in the background technology, the following problems often arise: how to improve the quality of the oxygen-enriched composite membrane. In response to these problems, the conventional solution is generally to collect images of the prepared oxygen-enriched composite membrane and perform defect detection on the images of the oxygen-enriched composite membrane. However, the above solution has the following technical problem 2: in the fields of medical equipment, aerospace, etc., the quality requirements for oxygen-enriched composite membranes are very high. The surface of the oxygen-enriched composite membrane is transparent. Directly collecting images for defect detection results in low accuracy of bubble detection, which leads to low quality of the oxygen-enriched composite membrane.

[0080] In view of the second technical problem in the background technology, we can adopt the following solution by cooperating with the R&D personnel of universities and combining the image processing technology they have:

[0081] In the first step, the polymer solution is coated on the surface of the prepared base film by a coating device to obtain an oxygen-rich composite film. Among them, the coating device can be a device for scraping the polymer solution to prepare the oxygen-rich composite film. The coating device can include but is not limited to a scraping component, a control chip and an image acquisition device, a thickness detection component and a sorting device. The scraping component can be a component for scraping the polymer solution. The scraping component can include but is not limited to a scraper and a scraper mechanical arm. The scraper can be fixedly arranged on the scraper mechanical arm. The scraper mechanical arm can be a mechanical arm for performing a scraping operation. The scraping operation can be an operation of scraping the polymer solution on the base film. The image acquisition device can be a device for collecting images. The image acquisition device can include but is not limited to a first laser device, a second laser device and an image acquisition device. The first laser device and the second laser device can be devices for emitting a light curtain. The first laser device and the second laser device can emit a light curtain to the surface of the base film at an angle of 10° to 15°. The image acquisition device can be a device for collecting images. For example, the image acquisition device may be a camera. The image acquisition device may be arranged directly above the upper surface of the base film. The thickness detection component may include at least one thickness detection sensor. It should be noted that when the thickness detection component detects the thickness of the composite film, the thickness detection sensors are evenly distributed above the surface of the composite film. The sorting device may be a sorting robot. The coating component, the first laser device, the second laser device, the thickness detection component, the sorting device and the image acquisition device are all communicatively connected to the control chip. The communication connection may be a wired connection or a wireless connection. The control chip is configured to perform the following sub-steps:

[0082] In the first sub-step, in response to receiving the application scenario type and polymer solution viscosity information sent by the preparation user terminal, the preset oxygen-rich composite membrane thickness corresponding to the above application scenario type is determined as the oxygen-rich composite membrane thickness, and the preset bubble condition corresponding to the above application scenario type is determined as the bubble condition. Among them, the above preparation user terminal can be a terminal of the preparation user. The above preparation user can be a user who prepares the oxygen-rich composite membrane. The above polymer solution viscosity information can include but is not limited to the polymer solution viscosity. The above application scenario type can be a type classified according to the application scenario of the oxygen-rich composite membrane. The above application scenario type can be but is not limited to: combustion system, medical equipment, industrial field. The above preset oxygen-rich composite membrane thickness can be the preset thickness of the oxygen-rich composite membrane when used in the corresponding application scenario. The above preset bubble condition can be a pre-set qualified condition for the bubbles in the oxygen-rich composite membrane. As an example, when the above application scenario is a medical device, the above preset oxygen-rich composite membrane thickness can be 0.1 mm, and the above preset bubble condition can be that the bubble amount is 0. Therefore, different preparation standards of oxygen-rich composite membranes can be determined according to different application scenarios, so that the preparation efficiency can be improved while improving the quality of the oxygen-rich composite membrane.

[0083] In the second sub-step, the viscosity information of the polymer solution and the thickness of the oxygen-enriched composite film are input into a preset scraping pressure information generation model to obtain scraping pressure information. The preset scraping pressure information generation model can be a linear function with the viscosity information of the polymer solution and the thickness of the oxygen-enriched composite film as input and the scraping pressure information as output. The scraping pressure information can be the pressure value of the scraper when performing the scraping operation. In this way, a scraping pressure that is more suitable for the application scenario and the currently prepared polymer solution can be obtained, thereby improving the quality of the obtained oxygen-enriched composite film.

[0084] The third sub-step is to control the scraping assembly to perform a scraping operation on the polymer solution to form a composite film according to the scraping pressure information. In practice, the scraper included in the scraping assembly can be controlled to apply the polymer solution to the prepared base film according to the scraping pressure information to form a composite film.

[0085] The fourth sub-step is, in response to detecting the scraping completion information corresponding to the scraping operation, controlling the first laser device and the second laser device to perform the start-up operation, and controlling the image acquisition device to acquire the composite film image of the composite film. The scraping completion information can indicate that the scraping operation is completed. For example, the scraping completion information can be "finish". The start-up operation can be an operation of turning on the laser device to emit a light curtain. Thus, the produced composite film can be illuminated by two laser devices, and light and dark stripes can be generated on the surface of the composite film to facilitate the detection of bubbles in the composite film.

[0086] The fifth sub-step is to perform bubble detection processing on the composite film image to obtain a bubble detection result. The bubble detection result can characterize whether bubbles exist in the composite film and the size of the bubbles. In practice, the composite film image can be subjected to bubble detection processing by a preset bubble detection algorithm to obtain a bubble detection result. The preset bubble detection algorithm can be a pre-set algorithm for detecting bubbles. For example, the preset bubble detection algorithm can be a bubble recognition algorithm based on deep learning.

[0087] In a sixth sub-step, in response to determining that the bubble detection result satisfies the bubble condition, the thickness detection component is controlled to perform thickness detection processing on the composite film to obtain a detection thickness set corresponding to each thickness detection point. The thickness detection point may be a point corresponding to a thickness detection sensor. The detection thickness may be a thickness value detected by the corresponding thickness detection sensor.

[0088] In a seventh sub-step, the variance of each detected thickness included in the detected thickness set is determined as the thickness variance.

[0089] In an eighth sub-step, in response to determining that the thickness variance satisfies a preset thickness condition, the sorting device is controlled to perform an oxygen-enriched composite membrane confirmation operation on the composite membrane to obtain an oxygen-enriched composite membrane. The preset thickness condition may be that the thickness variance is less than a preset thickness variance. The preset thickness variance may be a pre-set thickness variance value that characterizes that the thickness of the composite membrane surface is relatively uniform. The oxygen-enriched composite membrane confirmation operation may be an operation of sorting the composite membrane to the oxygen-enriched composite membrane.

[0090] The above-mentioned technical scheme and its related contents, as an inventive point of an embodiment of the present disclosure, solve the technical problem that "in the fields of medical equipment, aerospace, etc., the quality requirements for oxygen-rich composite membranes are very high. The surface of the oxygen-rich composite membrane is transparent, and images are directly collected for defect detection, resulting in low accuracy of bubble detection, which leads to low quality of the oxygen-rich composite membrane". The factors that lead to the low quality of oxygen-rich composite membranes are often as follows: the surface of the oxygen-rich composite membrane is transparent, and images are directly collected for defect detection, resulting in low accuracy of bubble detection, which leads to low quality of the oxygen-rich composite membrane. If the above-mentioned factors are solved, the effect of improving the quality of oxygen-rich composite membranes can be achieved. In order to achieve this effect, in the oxygen-rich composite membrane preparation method of some embodiments of the present disclosure, when performing bubble detection on the prepared oxygen-rich composite membrane, two groups of laser devices are used to emit light curtains to the surface of the composite membrane to produce light and dark stripes. Since the bubbles and the composite membrane matrix have different reflection and refraction characteristics to the laser, they will appear as abnormal light intensity areas in the image, which can facilitate the detection of bubbles in the composite membrane, thereby improving the accuracy of bubble detection. In addition, when preparing the oxygen-rich composite membrane, a more suitable oxygen-rich composite membrane thickness and scraping pressure can be determined based on the real-time prepared polymer solution viscosity and application scenarios, thereby improving the applicability and quality of the oxygen-rich composite membrane for the application scenarios, thereby improving the quality of the oxygen-rich composite membrane.

[0091] The above-mentioned various embodiments of the present disclosure have the following beneficial effects: through the preparation method of the oxygen-enriched composite membrane of some embodiments of the present disclosure, the oxygen-enriched performance and service life of the oxygen-enriched composite membrane can be improved. Specifically, the reasons for the short service life of the oxygen-enriched membrane and the reduced oxygen-enriched performance are: the characteristics of the PDMS material itself limit its limit performance of oxygen-enriched separation, and the mechanical strength of the PDMS material is poor, resulting in a short service life of the oxygen-enriched membrane; the PI membrane is a hydrophilic membrane, and under conditions of high humidity, more water enters the oxygen-enriched membrane and blocks the oxygen permeation channel, thereby causing the oxygen-enriched performance of the oxygen-enriched membrane to decrease. Based on this, the preparation method of the oxygen-enriched composite membrane of some embodiments of the present disclosure, first, 1,1,3,3,5,5-hexamethyltrisiloxane and diallyl maleate are mixed to obtain a first mixture, wherein the mass ratio of the above-mentioned 1,1,3,3,5,5-hexamethyltrisiloxane to the above-mentioned diallyl maleate is 1: (2-4); a first platinum catalyst is added to the above-mentioned first mixture to carry out a cross-linking reaction to obtain an intermediate product, wherein the side chain of the above-mentioned intermediate product contains vinyl. Thus, an intermediate product with vinyl groups can be obtained, which can be used to improve the adhesion between the polymer solution and the base film. Secondly, under preset temperature conditions, the second mixture, n-hexane and the second platinum catalyst are mixed to perform a cross-linking reaction to obtain a polymer solution, wherein the second mixture is a mixture of the intermediate product and 1,1,3,3-tetramethyldisiloxane, and the mass ratio of the intermediate product to the 1,1,3,3-tetramethyldisiloxane is 1:(0.4-0.5). Thus, a highly cross-linked polymer network structure can be obtained, thereby improving the mechanical strength and durability of the oxygen-enriched composite membrane. The above polymer solution is subjected to a viscosity detection process to obtain the viscosity of the polymer solution; according to the viscosity of the above polymer solution, the above polymer solution is coated on the surface of the prepared base film to obtain an oxygen-enriched composite membrane. Thus, an oxygen-enriched composite membrane with a denser network structure and higher mechanical properties can be obtained, thereby improving the service life and oxygen-enriched performance of the oxygen-enriched composite membrane. Also, because hexamethyltrisiloxane and diallyl maleate contain vinyl groups on the side chains of the intermediate products under the action of the catalyst, and the density of the cross-linked network structure is improved through the secondary cross-linking reaction, thereby improving the oxygen permeability and structural stability of the oxygen-enriched composite membrane, thereby improving the service life and oxygen-enrichment performance of the oxygen-enriched composite membrane.

[0092] The present disclosure also provides an oxygen-enriched composite membrane. The oxygen-enriched composite membrane is prepared through the above steps 101-105.

[0093] The present disclosure also provides a use of an oxygen-enriched composite membrane, wherein the oxygen-enriched composite membrane can be used in an oxygen-enriched combustion system and a portable oxygen-enriched device, wherein the portable oxygen-enriched device can be an on-board oxygen-enriched air conditioner.

[0094] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. A method for preparing an oxygen-enriched composite membrane, comprising: Mixing 1,1,3,3,5,5-hexamethyltrisiloxane and diallyl maleate to obtain a first mixture, wherein the mass ratio of the 1,1,3,3,5,5-hexamethyltrisiloxane to the diallyl maleate is 1:(2-4); adding a first platinum catalyst to the first mixture to perform a cross-linking reaction to obtain an intermediate product, wherein a side chain of the intermediate product contains a vinyl group; The second mixture, n-hexane and the second platinum catalyst are mixed to perform a crosslinking reaction to obtain a polymer solution, wherein the second mixture is a mixture of the intermediate product and 1,1,3,3-tetramethyldisiloxane, and the mass ratio of the intermediate product to the 1,1,3,3-tetramethyldisiloxane is 1:(0.4-0.5); Performing viscosity detection processing on the polymer solution to obtain the viscosity of the polymer solution; According to the viscosity of the polymer solution, the polymer solution is coated on the surface of the prepared base film to obtain an oxygen-enriched composite membrane.

2. The method according to claim 1, wherein: The mass ratio of the n-hexane to the second mixture is (10-12):

1.

3. The method according to claim 1, wherein: The amount of the second platinum catalyst used is 0.1% to 0.5% of the mass of the second mixture.

4. The method according to claim 1, wherein: The amount of the first platinum catalyst used is 0.1% to 0.5% of the mass of the first mixture.

5. The method according to claim 4, wherein: The material of the base film includes at least one of the following: polyvinylidene fluoride, polyetherimide, polyacrylonitrile, and polysulfone.

6. The method according to claim 1, wherein: The first platinum catalyst and the second platinum catalyst are chloroplatinic acid-vinylsiloxane complexes.

7. The method according to claim 6, wherein: The step of mixing the second mixture, n-hexane and the second platinum catalyst to perform a cross-linking reaction to obtain a polymer solution comprises: The second mixture, n-hexane and the second platinum catalyst are mixed and treated by a water bath method to perform a cross-linking reaction to obtain a polymer solution, wherein the water bath temperature ranges from 30°C to 60°C.

8. The method according to claim 1, wherein: According to the viscosity of the polymer solution, the polymer solution is coated on the surface of the prepared base film to obtain the oxygen-rich composite film, comprising: Inputting the viscosity of the polymer solution into a preset film coating speed generation model to obtain a film coating speed; According to the coating speed, the polymer solution is coated on the surface of the prepared base film to obtain an oxygen-enriched composite film.

9. An oxygen-enriched composite membrane, wherein: The oxygen-rich composite membrane is prepared by the method for preparing an oxygen-rich composite membrane according to any one of claims 1 to 8.

10. Use of the oxygen-enriched composite membrane as claimed in claim 9, wherein: The oxygen-enriched composite membrane is used for an oxygen-enriched combustion system and a portable oxygen-enriched device.

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