CN112403839B - Large-scale preparation method and device of carbon dioxide separation multilayer composite membrane - Google Patents

Large-scale preparation method and device of carbon dioxide separation multilayer composite membrane Download PDF

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CN112403839B
CN112403839B CN202011378652.0A CN202011378652A CN112403839B CN 112403839 B CN112403839 B CN 112403839B CN 202011378652 A CN202011378652 A CN 202011378652A CN 112403839 B CN112403839 B CN 112403839B
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coating
coating unit
oven
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film
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CN112403839A (en
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王志
生梦龙
董松林
乔志华
王纪孝
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Tianjin University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0081—After-treatment of organic or inorganic membranes
    • B01D67/0088—Physical treatment with compounds, e.g. swelling, coating or impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/10—Supported membranes; Membrane supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/12—Composite membranes; Ultra-thin membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0817—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1042—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material provided with means for heating or cooling the liquid or other fluent material in the supplying means upstream of the applying apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
    • B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/0413—Heating with air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0486—Operating the coating or treatment in a controlled atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/58—No clear coat specified
    • B05D7/586—No clear coat specified each layer being cured, at least partially, separately
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00—Carbon; Compounds thereof
    • C01B32/50—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2323/00—Details relating to membrane preparation
    • B01D2323/30—Cross-linking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2323/00—Details relating to membrane preparation
    • B01D2323/42—Details of membrane preparation apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Life Sciences & Earth Sciences (AREA)
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  • Manufacturing & Machinery (AREA)
  • Analytical Chemistry (AREA)
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  • Oil, Petroleum & Natural Gas (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention relates to a large-scale preparation method and a device of a multilayer composite membrane for separating carbon dioxide. The device comprises an unreeling device, a first coating unit, a second coating unit, a crosslinking modification unit, a third coating unit and a reeling device; the rear part of each coating unit is connected with an oven; the back of the crosslinking modification unit is connected with a volatilization drying box; a wringing press roller is arranged behind the unreeling device, an air knife is arranged at the upper part of the wringing press roller, and a coating unit is arranged behind the air knife; the coating unit comprises a comma scraper, a back rubber roll and a trough; the scraper sets up in the gum roller upper end, and the silo is at the gum roller lower extreme. The invention relates to a toolThe overall design of the process and the equipment is simple and compact, the equipment form can be flexibly selected according to the site size and the investment budget, and high-performance CO can be effectively realized 2 Large-scale preparation of separation multilayer composite membrane, and the prepared membrane can be used for flue gas CO 2 Capture and oilfield associated gas CO 2 Separation and the like.

Description

Large-scale preparation method and device of carbon dioxide separation multilayer composite membrane
Technical Field
The invention relates to a large-scale preparation method and a device of a multilayer composite membrane, which aim at gas separation, in particular to carbon dioxide CO 2 The field of separation. In particular to a large-scale preparation method and a device of a multilayer composite membrane for separating carbon dioxide.
Background
Atmospheric CO due to the massive consumption of fossil energy and the influence of human activities 2 Is increased significantly, so that ecological disasters and extreme climatic events frequently occur [1] . Recent reports of the inter-government climate Change Committee (IPCC) of United nations indicate that CO is currently available 2 Is still the most important greenhouse gas and plays a crucial role in global warming. The global temperature rise of 2 ℃ will have serious negative effects on water resources, land utilization, grain production and human health. It was concluded that without carbon capture, utilization and storage (CCUS) technology, it was not possible to control the temperature rise below 2 ℃ by the end of this century [2] 。
At present, the first generation carbon capture technology represented by an amine absorption method is most widely applied, but has the problems of high cost, high energy consumption, solvent pollution and the like. Research has shown that if 90% of the carbon dioxide is removed from the flue gas using existing amine absorption technology, the electricity costs are expected to increase by 50-90% [3] . The membrane separation technology has the advantages of low energy consumption, no solvent volatilization, small occupied area, unobvious amplification effect and the like, and is considered to be a promising second-generation CO 2 A trapping technique.
However, CO of existing commercial membranes 2 Separation performance is not yet goodThe ultra-thin multilayer composite film with high performance is expected to meet the requirements of industrial application [4] . The multilayer composite membrane consists of a support layer, an intermediate layer, a separation layer and a protective layer, each layer of material can be individually designed to achieve optimal separation performance. The separation performance of the composite membrane is mainly determined by the material of the separation layer, and in order to fully exert the separation performance of the membrane material developed in a laboratory, the thickness of the separation layer is generally less than 0.2 micron, the skin layer is complete and has no defects, and the difficulty of large-scale preparation is very large. In recent years, although laboratories have developed a variety of high performance CO 2 Separation membrane materials, but only the American MTR company [5] GKSS, Germany [6] The research institutions carry out pilot test and industrial demonstration research by utilizing respective patent composite membrane products, and are used for CO due to great economic value 2 There have been very few reports of scale-up processes and equipment for preparing separated multilayer composite membranes.
For CO 2 The reasons for the less extensive preparation of isolated multilayer composite membranes are mainly: 1. most of high-performance membrane materials reported in the literature have complex synthesis processes and expensive material cost, so that kilogram-level preparation is difficult, and further, enough membrane coating liquid cannot be provided for large-scale membrane preparation of composite membranes. 2. The membrane preparation process should be as simple, mature and efficient as possible, avoiding any complex or particularly time-consuming process to ensure that the membrane preparation is carried out on an industrial installation. 3. The multilayer composite film has different material properties and coating methods for each layer, and different requirements for coating speed and drying conditions for each layer, and it is a challenge to efficiently produce a multilayer film with one apparatus [7] . 4. Compared with the laboratory preparation of small membranes, when large membranes are prepared on a large scale by using an industrial device, the membrane preparation process is more difficult to control due to new influence factors such as vibration of membrane surfaces, precision of scrapers, friction of guide rollers, static electricity on membrane surfaces and the like [8] . 5. The coating equipment for preparing the multilayer composite film has large investment, and particularly, the customized multi-head coating equipment generally needs more than hundreds of thousands of dollars.
For large-scale production of CO 2 The invention provides a novel multilayer composite film coating device, which can realize the coating of the multilayer composite filmA method for preparing a multilayer composite film developed by the company. By the device and the production method provided by the invention, high-performance CO is prepared 2 The separation membrane has great application potential in the aspects of flue gas carbon capture, oil field associated gas decarburization and the like.
Reference to the literature
[1]Schwartzman A,Keeling R.Achieving atmospheric verification of CO 2 emissions[J].Nature Climate Change,2020,10(5):1-2.
[2]Climate change 2014,the fifth assessment report of the Intergovernmental Panel on Climate Change,2014.
[3]Luis P,Gerven T,Bruggen B.Recent developments in membrane-based technologies for CO2 capture[J].Progress in Energy&Combustion science,2012,38(3):419-448.
[4]Dongsanlin, high performance CO 2 Development and amplification of separation multilayer composite membranes [ D]Tianjin, Tianjin university, 2020.
[5]Merkel TC,Lin H,Wei X,et al.Power plant post-combustion carbon dioxide capture:An opportunity for membranes[J].Journal of Membrane science,2010,359(1-2):126-139.
[6]Yave W,Car A,Wind J,Peinemann K.Nanometric thin film membranes manufactured on square meter scale:ultra-thin films for CO 2 capture[J].Nanotechnology,2010,21(39):395301.
[7] Knap, loss of coating components during recycling of knife-applied coatings and its control [ J ] papermaking chemicals, 2013,25(006):56-60.
[8]Ion V,Scarisoreanu ND,Bonciu A,et al.Multilayer protective coatings obtained by pulsed laser deposition[J].Applied Surface Science,2019,479(15):1124-1131.
Disclosure of Invention
The invention aims to realize high-performance CO 2 The large-scale preparation of the separation multilayer composite membrane promotes the application of the membrane separation technology in the fields of flue gas carbon capture, energy source gas purification and the like.
This group has developed a small scale laboratory high performance CO 2 Separation is manyThe preparation method of the layer composite membrane needs to use an industrial-scale coating device for preparing the multilayer composite membrane in an amplifying way. At present, a common coating device is mainly used in the printing industry, is mostly designed for one material, is difficult to prepare a multilayer composite film which needs to use a plurality of different materials, particularly lacks a necessary surface modification unit, can only realize simple surface coating or compounding, has single function and lower production efficiency, and is not suitable for CO which has higher requirements on coating performance and coating precision 2 The field of separation membranes, therefore, the need to improve the existing various coating devices and develop and design novel devices for preparing high-performance CO 2 A coating apparatus for separating a multilayer composite film.
The multilayer composite film of the present invention includes a support layer, an intermediate layer, a separation layer, and a protective layer. The main function of the supporting layer is to provide strength support for the composite membrane, and ensure that the composite membrane does not have defects when used under actual working conditions, particularly under high pressure. The base film mentioned in the invention is composed of a support layer and non-woven fabrics, the support layer used in the invention is polysulfone, and the thickness is 30 microns. At present, the thickness fluctuation of a supporting layer of a mainstream commodity base film is large, and the pore diameter distribution of the surface of the supporting layer is not uniform. For this purpose, the invention coats an intermediate layer on the surface of the support layer. The middle layer mainly has the function of providing a uniform and flat surface for coating a subsequent separation layer and reducing the phenomenon of pore permeation of the separation layer caused by macropores of the support layer. In the embodiment of the invention, Polydimethylsiloxane (PDMS) is selected as the material of the intermediate layer. The performance of the multilayer composite membrane is mainly determined by a separation layer, large-scale membrane preparation means consumption of a large amount of membrane materials, and the subject group has completed high-performance CO 2 The large-scale synthesis of polyvinyl amine (PVAm) as a separation membrane material. The separating layer coating liquid contains PVAm, sodium Polyacrylate (PAAS), Sodium Dodecyl Sulfate (SDS) and polyvinyl alcohol (PVA) in a certain proportion, and is abbreviated as PPSA. After the separation layer is coated on the multilayer composite membrane, the surface of the separation layer can be moderately crosslinked through the crosslinking modification unit, so that the permeation rate of the composite membrane is properly reduced, and the separation factor of the membrane is remarkably improved. The surface crosslinking process of the present invention uses trimesoyl chloride (TMC) as the crosslinking agent.The outermost layer of the multilayer composite film is a protective layer, the protective layer has the main function of providing physical protection for the composite film, the separation film is prevented from being damaged in the subsequent assembly rolling process, the protective layer can also repair the possible defects of the separation layer, and PDMS is selected as a protective layer material in the invention. However, the multilayer composite film cannot be industrialized by the current equipment, so that the realization of high-performance CO through technical research is needed 2 The technical research of the large-scale preparation of the separation multilayer composite membrane.
The technical scheme of the invention is as follows:
a large-scale device for separating a multilayer composite membrane from carbon dioxide; the coating device comprises an unreeling device (1), a first coating unit (4), a second coating unit (6), a crosslinking modification unit (8), a third coating unit (10) and a reeling device (12); the device is characterized in that the rear part of each coating unit is connected with an oven; the back of the crosslinking modification unit is connected with a volatilization drying box; the water squeezing press roller (2) is installed behind the unreeling device (1), the air knife (3) is arranged on the upper portion of the water squeezing press roller (2), and the coating unit is installed behind the air knife (3).
The coating unit of the device comprises a comma scraper, a back rubber roll and a trough; the scraper sets up in the gum roller upper end, and the silo is at the gum roller lower extreme.
The unwinding device and the winding device are provided with independent double-arm double-station rotary type revolving frames, and material rolls can be changed without stopping.
Comma scrapers of the first coating unit and the third coating unit both use two cutting edge coating heads processed by ultra-precision grinding, so that the coating precision is ensured and the switching is convenient; a comma scraper or a slit type coating head is used in the second coating unit; the thickness of the comma scraper gap or the slit coating head is set to be 50-500 microns, preferably 100-300 microns; the material tanks of the first coating unit, the second coating unit, the crosslinking modification unit and the third coating unit are required to be provided with an overflow device, a circulating material supplementing device and a heat preservation device; the first coating unit and the third coating unit are provided with a circulating refrigeration device.
The first drying oven and the second drying oven of the device are divided into 2-7 sections, and each section is 2-4 meters; the length of the volatilization drying box of the crosslinking modification unit is 2-4 meters; the third drying oven is divided into 2-3 sections, and each section is 2-4 meters; the drying ovens of all the drying ovens are bridge type drying ovens, the drying ovens are designed in a segmented mode, and the temperature and the air speed of each segment are independently controlled.
The invention provides a large-scale preparation method of a carbon dioxide separation multilayer composite membrane, which comprises the following steps:
1) after unwinding the wet base film, extruding most of water through a compression roller, and then removing water drops on the surface through an air knife;
2) the dewatered base film enters a first coating unit to be coated with a middle layer, so that the single side of the film is in contact with the coating liquid in a trough, the wet coating thickness is adjusted through the gap size of a comma scraper, and then the base film enters a first drying oven to be dried;
3) the film coming out of the first drying oven enters a second coating unit to continuously coat a separation layer, the single side of the film is required to contact with the separation layer coating liquid in the material groove, the film with the specific wet coating thickness is obtained after extrusion by a comma scraper or a slit, and then the film enters a second drying oven;
4) the membrane from the second oven enters a crosslinking modification unit, the separation performance of the membrane is improved by modifying the surface of the separation layer, and the single surface of the membrane is required to contact the solution of a crosslinking modification material groove and then enters a volatilization drying box;
5) the film coming out of the volatilization drying oven enters a third coating unit to be coated with a protective layer, and the single side of the film is ensured to be contacted with the coating liquid, and enters a third drying oven after passing through a comma scraper;
6) and the film coming out of the third oven is continuously wound on a winding core through a winding device to finally obtain a multilayer composite film product.
The air outlet speed of the air knife is 5-15 m/min, and the air temperature is 50-120 ℃.
The maximum drying temperature of the first oven, the second oven and the third oven is 75-105 ℃, and preferably 95-105 ℃; the maximum drying temperature of the crosslinking modification unit is 50-80 ℃, and preferably 70-80 ℃; the air speed of all ovens and drying ovens is 1-5 m/s, preferably 3-5 m/s.
The coating speed of the coating equipment is 1-10 m/min, and the effective coating width of the film is determined by the unreeled base film.
The temperature of the coating liquid of the circulating refrigeration device of the first coating unit and the third coating unit is controlled to be between-5 and 5 ℃, preferably between-5 and 0 ℃.
Compared with the prior art, the technology is mainly improved in that the wind speed of the wind knife is controlled to be 5-15 m/min and the wind temperature is controlled to be 50-120 ℃ before coating, so that the moisture on the surface of the base film is removed to facilitate the spreading of the coating liquid on the film surface, and the water in the holes of the base film is reserved to avoid the hole seepage of the coating liquid. In addition, the technology comprises a surface modification unit besides the traditional layer-by-layer compounding, and the CO of the separation membrane is improved through moderate crosslinking modification on the surface of the membrane 2 Separating ability and repairing membrane surface defects.
In addition, in order to remove static electricity generated by friction between the multilayer composite film and the equipment guide roller, static electricity elimination equipment including a static rope, an ion fan static electricity eliminator and the like can be installed at each coating unit and each winding position of the equipment.
In particular, the first coating unit, the second coating unit and the third coating unit are similar in structure, with the main difference being the oven length. Therefore, the third coating unit can be omitted for direct rolling, the paper is unreeled again and is rolled by the first coating unit to obtain a final product, the design can save the occupied area of equipment, and the efficiency is reduced by coating twice.
The process and the equipment of the invention have simple and compact integral design, can flexibly select the equipment form according to the field size and the investment budget, and can effectively realize high-performance CO 2 Large-scale preparation of separation multilayer composite membrane, and the prepared membrane can be used for flue gas CO 2 Capture and oilfield associated gas CO 2 Separation and the like.
Drawings
FIG. 1 shows CO according to the present invention 2 Schematic structural diagram of separating multilayer composite membrane.
FIG. 2 is a schematic diagram of a device for large-scale preparation of a multilayer composite film according to the present invention. Wherein: (1) an unwinding device; (2) squeezing a press roll; (3) an air knife; (4) a first coating unit; (5) a first oven; (6) a second coating unit; (7) a second oven; (8) a crosslinking modification unit; (9) a volatilization drying box; (10) a third coating unit; (11) a third drying oven; (12) a winding device; (4-1) a first coating comma blade, (6-1) a second coating comma blade, (10-1) a third coating comma blade; (4-2) a first coating back-rubber roller, (6-2) a second coating back-rubber roller, and (10-2) a third coating back-rubber roller; (4-3) a first coating and distributing groove, (6-3) a second coating and distributing groove, and (10-3) a third coating and distributing groove.
FIG. 3 is an electron microscope image of the multilayer composite film prepared by the present invention.
FIG. 4 is a diagram of a 500 meter length composite film product made in accordance with the present invention.
Detailed Description
The scale-up preparation device and preparation method of the multilayer composite membrane are further described below by combining the drawings and examples.
The invention provides a method for preparing CO on a large scale 2 The device for separating the multilayer composite film can realize coating of each layer and continuously prepare the multilayer composite film by operating the device once or twice. As shown in fig. 2, the apparatus mainly includes an unwinding device (1), a first coating unit (4), a second coating unit (6), a crosslinking modification unit (8), a third coating unit (10), a winding device (12), and the like, wherein the coating unit includes a comma blade, a back glue roller, and a trough. The back of the first coating unit is connected with the first drying oven, the back of the second coating unit is connected with the second drying oven, the back of the crosslinking modification unit is connected with the volatilization drying oven, and the back of the third coating unit is connected with the third drying oven. A wringing press roller (2) is arranged behind the unreeling device (1), an air knife (3) is arranged at the upper part of the wringing press roller (2), and a first coating unit (4) consisting of a comma scraper (4-1), a back rubber roll (4-2) and a first coating material groove (4-3) is arranged behind the air knife (3); then a first drying oven (5), a second coating unit (6), a second drying oven (7), a crosslinking modification unit (8), a volatilization drying oven (9), a third coating unit (10) and a third drying oven (11) are sequentially connected and installed, wherein the second coating unit (6) is sequentially connected with (6-1) a comma scraper, (6-2) a back rubber roll and (6-3) a trough from top to bottom, the third coating unit (10) is sequentially connected with (10-1) the comma scraper, (10-2) the back rubber roll and (10-3) the trough from top to bottom, and a winding device (12) is installed at the end of the equipment.
The unwinding device and the winding device in the device are provided with independent double-arm double-station rotary type revolving frames, so that the material changing without stopping is realized, and the continuous production is ensured. The gap between the air outlet of the air knife is 1-10 mm, the air speed is 5-15 m/min, and the air temperature is 50-120 ℃.
The material groove of the first coating unit, the second coating unit, the crosslinking modification unit and the third coating unit in the device needs to be provided with an overflow device, a circulating material supplementing device and a heat preservation device, so that the concentration of the coating liquid in the material groove is uniform and stable. In addition, considering that the film materials used in the first coating unit and the third coating unit should be kept at a low temperature to avoid gelation, the tank is also provided with a circulating refrigeration device, and the temperature of the coating liquid is controlled to be between-5 ℃ and 5 ℃, preferably between-5 ℃ and 0 ℃. The comma scrapers of the first coating unit and the third coating unit both use two cutting edge coating heads processed by ultra-precision grinding, so that the coating precision is ensured and the switching is convenient; a comma scraper or a slit type coating head can be used in the second coating unit, and the slit type coating head has higher cost and can more stably and accurately control the wet coating thickness of the separation layer.
The drying ovens in the device are all bridge type drying ovens, the arched guide rollers can avoid the drifting of the film, the negative pressure design reduces the solvent residue, and the hot air circulation design can recover the heat energy of the waste gas. The drying oven is designed in a segmented mode, and the temperature and the wind speed of each segment are independently controlled. The first oven and the second oven are divided into 2-7 sections, each section is 2-4 m, the maximum drying temperature is 75-105 ℃, and the best drying temperature is 95-105 ℃; the length of the volatilization drying box of the crosslinking modification unit is 2-4 meters; the third oven is divided into 2-3 sections, each section is 2-4 m, and the maximum drying temperature is 50-80 deg.C, preferably 70-80 deg.C. The air speed of all the ovens and drying ovens is 1-5 m/s, preferably 3-5 m/s. The coating speed of the coating equipment in the invention is 1-10 m/min, and the effective coating width of the film is determined by the unreeled base film.
The invention relates to CO 2 The large-scale preparation method for separating the multilayer composite membrane comprises the following steps:
1) after unwinding the wet base film, extruding most of water through a compression roller, and then removing water drops on the surface through an air knife;
2) the dewatered base film enters a first coating unit to be coated with a middle layer, so that the single side of the film is in contact with the coating liquid in a trough, the wet coating thickness is adjusted through the gap size of a comma scraper, and then the base film enters a first drying oven to be dried;
3) the film coming out of the first drying oven enters a second coating unit to continuously coat a separation layer, the single side of the film is required to contact with the separation layer coating liquid in the material groove, the film with the specific wet coating thickness is obtained after extrusion by a comma scraper or a slit, and then the film enters a second drying oven;
4) the membrane from the second oven enters a crosslinking modification unit, the separation performance of the membrane is improved by properly modifying the surface of the separation layer, and the single surface of the membrane is required to contact with the solution of a crosslinking modification trough and then enters a volatilization drying oven;
5) the film coming out of the volatilization drying oven enters a third coating unit to be coated with a protective layer, and the single side of the film is ensured to be contacted with the coating liquid, and enters a third drying oven after passing through a comma scraper;
6) and the film coming out of the third oven is continuously wound on a winding core through a winding device to finally obtain a multilayer composite film product.
The base film consists of a supporting layer and non-woven fabric, wherein the supporting layer is made of polysulfone and has the thickness of 30 microns. However, the surface aperture distribution of the current mainstream commodity base membrane supporting layer is not uniform, and the thickness fluctuation of the supporting layer is large. For this purpose, an intermediate layer needs to be applied to the surface of the support layer. The middle layer mainly has the function of providing a uniform and flat surface for coating a subsequent separation layer and reducing the phenomenon of pore permeation of the separation layer caused by macropores of the support layer. In the embodiment of the invention, Polydimethylsiloxane (PDMS) is selected as the material of the intermediate layer. The performance of the multilayer composite membrane is mainly determined by the separation layer, and the ultrathin defect-free preparation of the high-performance separation layer is the core task of the invention. The team has long studied a variety of high performance COs, represented by polyvinylamine (PVAm) 2 The membrane material is separated, and the large-scale synthesis of PVAm is realized, which is also the important research foundation of the invention. The separating layer coating liquid in the embodiment of the invention contains PVAm, and also contains sodium Polyacrylate (PAAS), Sodium Dodecyl Sulfate (SDS) and polyvinyl alcohol (PVA) in a certain proportion, and the separating layer coating liquid used in the invention is abbreviated as PPSA. The multilayer composite film may be coated with a separating layerThe surface of the separation layer is properly crosslinked through the crosslinking modification unit, so that the permeation rate of the separation membrane is properly reduced, and the separation factor of the composite membrane is remarkably improved. Examples the surface cross-linking process used trimesoyl chloride (TMC) as the cross-linking agent. The outermost layer of the multilayer composite membrane is a protective layer, the protective layer has the main function of providing physical protection for the composite membrane, the separation membrane is prevented from being damaged in the subsequent assembly rolling process, the protective layer can also repair the possible defects of the separation layer, and PDMS is selected as a protective layer material in the embodiment of the invention. Thus, high performance CO can be realized by the device and the operation method 2 And (3) large-scale preparation of the separated multilayer composite membrane.
In the following examples, CO with different properties was obtained mainly by adjusting the operating conditions of air knife parameters, coating unit scraper gap and oven drying parameters 2 Separating the multilayer composite membrane.
Example 1
1. And (3) placing 500 m of polysulfone ultrafiltration base membrane on an unwinding device, setting the pressure of a wringing compression roller to be 1.5MPa, the air knife temperature to be 80 ℃ and the air speed to be 8 m/s.
2. Preparing PDMS middle layer coating liquid, pumping the coating liquid into a trough of a first coating unit through a pump, starting a circulating refrigeration device connected with the trough, and setting the temperature to be-5 ℃. The gap of the comma blade of the first coating unit was set to 300 μm, the temperature of the first oven was set to 70 ℃, and the air speed was set to 3 m/s.
3. And preparing PPSA separation layer coating liquid, standing and defoaming for 30 minutes, and pouring the coating liquid into a separation layer trough of a second coating unit. Setting the scraper gap of the second coating unit to be 300 micrometers, or controlling the amount of the coating liquid extruded by the slit to ensure that the thickness of the wet coating is 300 micrometers, setting the temperature of the second oven to be 95 ℃, and setting the air speed to be 3 m/s.
4. And (3) preparing a TMC solution for crosslinking modification, so that the single side of the composite membrane is contacted with the solution and then enters a volatilization drying box, and the air speed of the drying box is 5 m/s.
5. And preparing a PDMS coating liquid, and adding the PDMS coating liquid into a trough of the third coating unit for preparing a protective layer of the multilayer composite film. And starting a circulating refrigerating device, setting the temperature to be-5 ℃, setting the gap of a scraper of the third coating unit to be 300 microns, setting the temperature of a third oven to be 80 ℃, and setting the air speed to be 3 m/s.
6. The running speed of the coating equipment is set to be 5 m/min, and the coating equipment continuously runs for 100 min to obtain a roll of multilayer composite film with the total length of 500 m.
7. Random sampling from 500 m film rolls, and then subjecting the separation film samples to CO 2 /N 2 Mixed gas (volume ratio 15/85, simulation flue gas CO) 2 Capture application) and CO 2 /CH 4 Mixed gas (volume ratio of 10/90, simulation of oilfield associated gas CO) 2 Separation application) system, the test pressure is 0.5MPa, the test temperature is 25 ℃, and the test results are shown in Table 1.
Example 2
1. And (3) placing 500 m of polysulfone ultrafiltration base membrane on an unwinding device, setting the pressure of a wringing compression roller to be 1.5MPa, the temperature of an air knife to be 120 ℃, and the air speed to be 12 m/s.
2. Preparing PDMS middle layer coating liquid, pumping the coating liquid into a trough of a first coating unit through a pump, starting a circulating refrigeration device connected with the trough, and setting the temperature to be-5 ℃. The gap of the comma blade of the first coating unit was set to 300 μm, the temperature of the first oven was set to 70 ℃, and the air speed was set to 3 m/s.
3. And preparing PPSA separation layer coating liquid, standing and defoaming for 30 minutes, and pouring the coating liquid into a separation layer trough of a second coating unit. Setting the scraper gap of the second coating unit to be 300 micrometers, or controlling the amount of the coating liquid extruded by the slit to ensure that the thickness of the wet coating is 300 micrometers, setting the temperature of the second oven to be 95 ℃, and setting the air speed to be 3 m/s.
4. And (3) preparing a TMC solution for crosslinking modification, so that the single side of the composite membrane is contacted with the solution and then enters a volatilization drying box, and the air speed of the drying box is 5 m/s.
5. And preparing a PDMS coating liquid, and adding the PDMS coating liquid into a trough of the third coating unit for preparing a protective layer of the multilayer composite film. And starting a circulating refrigerating device, setting the temperature to be-5 ℃, setting the gap of a scraper of the third coating unit to be 300 microns, setting the temperature of a third oven to be 80 ℃, and setting the air speed to be 3 m/s.
6. The running speed of the coating equipment is set to be 5 m/min, and the coating equipment continuously runs for 100 min to obtain a roll of multilayer composite film with the total length of 500 m.
7. Random sampling from 500 m film rolls, and then subjecting the separation film samples to CO 2 /N 2 Mixed gas (volume ratio 15/85, simulation flue gas CO) 2 Capture application) and CO 2 /CH 4 Mixed gas (volume ratio 10/90, simulation oil field associated gas CO) 2 Separation application) system, the test pressure is 0.5MPa, the test temperature is 25 ℃, and the test results are shown in Table 1.
Example 3
1. And (3) placing 500 m of polysulfone ultrafiltration base membrane on an unwinding device, setting the pressure of a wringing compression roller to be 1.5MPa, the temperature of an air knife to be 100 ℃, and the air speed to be 12 m/s.
2. Preparing PDMS middle layer coating liquid, pumping the coating liquid into a trough of a first coating unit through a pump, starting a circulating refrigeration device connected with the trough, and setting the temperature to be-5 ℃. The gap of the comma blade of the first coating unit was set to 300 μm, the temperature of the first oven was set to 70 ℃, and the air speed was set to 3 m/s.
3. And preparing PPSA separation layer coating liquid, standing and defoaming for 30 minutes, and pouring the coating liquid into a separation layer trough of a second coating unit. Setting the gap of a scraper of the second coating unit to be 100 micrometers, or controlling the amount of the coating liquid extruded from the slit to ensure that the thickness of the wet coating is 100 micrometers, setting the temperature of the second oven to be 75 ℃, and setting the air speed to be 3 m/s.
4. And (3) preparing a TMC solution for crosslinking modification, so that the single side of the composite membrane is contacted with the solution and then enters a volatilization drying box, and the air speed of the drying box is 5 m/s.
5. And preparing a PDMS coating liquid, and adding the PDMS coating liquid into a trough of the third coating unit for preparing a protective layer of the multilayer composite film. And starting a circulating refrigerating device, setting the temperature to be-5 ℃, setting the gap of a scraper of the third coating unit to be 300 microns, setting the temperature of a third oven to be 80 ℃, and setting the air speed to be 3 m/s.
6. The running speed of the coating equipment is set to be 5 m/min, and the coating equipment continuously runs for 100 min to obtain a roll of multilayer composite film with the total length of 500 m.
7. Random sampling from 500 m film rolls, and then subjecting the separation film samples to CO 2 /N 2 MixingGas (volume ratio 15/85, simulated flue gas CO) 2 Capture application) and CO 2 /CH 4 Mixed gas (volume ratio of 10/90, simulation of oilfield associated gas CO) 2 Separation application) system, the test pressure is 0.5MPa, the test temperature is 25 ℃, and the test results are shown in table 1.
Example 4
1. And (3) placing 500 m of polysulfone ultrafiltration base membrane on an unwinding device, setting the pressure of a wringing compression roller to be 1.5MPa, the temperature of an air knife to be 100 ℃, and the air speed to be 12 m/s.
2. Preparing PDMS middle layer coating liquid, pumping the coating liquid into a trough of a first coating unit through a pump, starting a circulating refrigeration device connected with the trough, and setting the temperature to be-5 ℃. The gap of the comma blade of the first coating unit was set to 300 μm, the temperature of the first oven was set to 70 ℃, and the air speed was set to 3 m/s.
3. And preparing PPSA separation layer coating liquid, standing and defoaming for 30 minutes, and pouring the coating liquid into a separation layer trough of a second coating unit. Setting the gap of a scraper of the second coating unit to be 200 micrometers, or controlling the amount of the coating liquid extruded by the slit to ensure that the thickness of the wet coating is 200 micrometers, setting the temperature of the second oven to be 85 ℃, and setting the air speed to be 3 m/s.
4. And (3) preparing a TMC solution for crosslinking modification, so that the single side of the composite membrane is contacted with the solution and then enters a volatilization drying box, and the air speed of the drying box is 5 m/s.
5. And preparing a PDMS coating liquid, and adding the PDMS coating liquid into a trough of the third coating unit for preparing a protective layer of the multilayer composite film. And starting a circulating refrigerating device, setting the temperature to be-5 ℃, setting the gap of a scraper of the third coating unit to be 300 microns, setting the temperature of a third oven to be 80 ℃, and setting the air speed to be 3 m/s.
6. The running speed of the coating equipment is set to be 5 m/min, and the coating equipment continuously runs for 100 min to obtain a roll of multilayer composite film with the total length of 500 m.
7. Random sampling from 500 m film rolls, and then subjecting the separation film samples to CO 2 /N 2 Mixed gas (volume ratio 15/85, simulation flue gas CO) 2 Capture application) and CO 2 /CH 4 Mixed gas (volume ratio of 10/90, simulation of oilfield associated gas CO) 2 Separation application) bodyThe test was carried out at a test pressure of 0.5MPa and a test temperature of 25 ℃ and the test results are shown in Table 1.
Example 5
1. And (3) placing 500 m of polysulfone ultrafiltration base membrane on an unwinding device, setting the pressure of a wringing compression roller to be 1.5MPa, the temperature of an air knife to be 100 ℃, and the air speed to be 12 m/s.
2. Preparing PDMS middle layer coating liquid, pumping the coating liquid into a trough of a first coating unit through a pump, starting a circulating refrigeration device connected with the trough, and setting the temperature to be-5 ℃. The gap of the comma blade of the first coating unit was set to 300 μm, the temperature of the first oven was set to 70 ℃, and the air speed was set to 3 m/s.
3. And preparing PPSA separation layer coating liquid, standing and defoaming for 30 minutes, and pouring the coating liquid into a separation layer trough of a second coating unit. Setting the gap of a scraper of the second coating unit to be 100 micrometers, or controlling the amount of the coating liquid extruded from the slit to ensure that the thickness of the wet coating is 100 micrometers, setting the temperature of the second oven to be 75 ℃, and setting the air speed to be 3 m/s.
4. And (3) preparing a TMC solution for crosslinking modification, so that the single side of the composite membrane is contacted with the solution and then enters a volatilization drying box, and the air speed of the drying box is 5 m/s.
5. And preparing a PDMS coating liquid, and adding the PDMS coating liquid into a trough of the third coating unit for preparing a protective layer of the multilayer composite film. And starting a circulating refrigerating device, setting the temperature to be-5 ℃, setting the gap of a scraper of the third coating unit to be 300 microns, setting the temperature of a third oven to be 80 ℃, and setting the air speed to be 3 m/s.
6. The running speed of the coating equipment is set to be 5 m/min, and the coating equipment continuously runs for 100 min to obtain a roll of multilayer composite film with the total length of 500 m.
7. Random sampling from 500 m film rolls, and then subjecting the separation film samples to CO 2 /N 2 Mixed gas (volume ratio 15/85, simulation flue gas CO) 2 Capture application) and CO 2 /CH 4 Mixed gas (volume ratio of 10/90, simulation of oilfield associated gas CO) 2 Separation application) system, the test pressure is 0.5MPa, the test temperature is 25 ℃, and the test results are shown in Table 1.
Test data and conclusions
CO of multilayer composite films prepared under different air knife parameters, coating thickness and oven temperature operating conditions in the above examples 2 The separation performance is as follows:
TABLE 1 CO of multilayer composite membranes made under different operating conditions 2 Separation Performance
Figure BDA0002807882640000111
Note: 1 permeation rate of CO 2 Gas permeation rate in GPU, 1 GPU-10 -6 cm 3 (STP)cm -2 s -1 cmHg -1 ；
2 The separation factor is CO 2 Gas permeation rate and N 2 、CH 4 Ratio of gas permeation rates.
As can be seen from Table 1, in CO 2 /N 2 And CO 2 /CH 4 Under the system, the CO prepared by the invention 2 The separation multilayer composite membrane shows good separation performance, and composite membranes with different permeation rates and different separation factors can be obtained by adjusting the operating conditions such as air knife parameters, coating thickness and oven temperature, and the separation multilayer composite membrane is suitable for different application occasions.
While the methods and apparatus of the present invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations in the methods and apparatus described herein may be made and used to achieve the final fabrication techniques without departing from the spirit and scope of the invention. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be within the spirit, scope and content of the invention.

Claims (11)

1. A device for preparing a multilayer composite membrane for separating carbon dioxide on a large scale; the coating device comprises an unreeling device (1), a first coating unit (4), a second coating unit (6), a crosslinking modification unit (8), a third coating unit (10) and a reeling device (12); the device is characterized in that the rear part of each coating unit is connected with an oven; the back of the crosslinking modification unit is connected with a volatilization drying box; a wringing press roller (2) is arranged behind the unreeling device (1), an air knife (3) is arranged at the upper part of the wringing press roller (2), and a coating unit is arranged behind the air knife (3);
comma scrapers of the first coating unit and the third coating unit both use two cutting edge coating heads processed by ultra-precision grinding, so that the coating precision is ensured and the switching is convenient; a comma scraper or a slit type coating head is used in the second coating unit; the comma blade gap or slit coating head thickness is set within the range of 50-500 microns; the material tanks of the first coating unit, the second coating unit, the crosslinking modification unit and the third coating unit are required to be provided with an overflow device, a circulating material supplementing device and a heat preservation device; the first coating unit and the third coating unit are provided with a circulating refrigeration device;
the first drying oven and the second drying oven are divided into 2-7 sections, and each section is 2-4 meters; the length of the volatilization drying box of the crosslinking modification unit is 2-4 meters; the third drying oven is divided into 2-3 sections, and each section is 2-4 meters; the drying ovens of all the drying ovens are bridge type drying ovens, the drying ovens are designed in a segmented mode, and the temperature and the air speed of each segment are independently controlled.
2. The apparatus of claim 1, wherein the coating unit comprises a comma doctor, a backing roll, and a trough; the scraper sets up in the gum roller upper end, and the silo is at the gum roller lower extreme.
3. The apparatus of claim 1, wherein the unwinding device and the winding device are provided with independent dual-arm dual-station rotary turret for changing the rolls without stopping.
4. The apparatus of claim 1, wherein the comma blade gap or slit coating head thickness is set within a range of 100 and 300 microns.
5. A large-scale preparation method of a carbon dioxide separation multilayer composite membrane is characterized by comprising the following steps:
1) after unwinding the wet base film, extruding most of water through a compression roller, and then removing water drops on the surface through an air knife;
2) the dewatered base film enters a first coating unit to be coated with a middle layer, so that the single side of the film is in contact with the coating liquid in a trough, the wet coating thickness is adjusted through the gap size of a comma scraper, and then the base film enters a first drying oven to be dried;
3) the film coming out of the first drying oven enters a second coating unit to continuously coat a separation layer, the single side of the film is required to be contacted with the separation layer coating liquid in the material groove, the film is extruded by a comma scraper or a slit to obtain a wet-coating-thickness film, and then the wet-coating-thickness film enters a second drying oven;
4) the membrane from the second oven enters a crosslinking modification unit, the separation performance of the membrane is improved by modifying the surface of the separation layer, and the single side of the membrane is required to contact the solution of a crosslinking modification material groove and then enters a volatilization drying box;
5) the film coming out of the volatilization drying oven enters a third coating unit to be coated with a protective layer, and the single side of the film is ensured to be contacted with the coating liquid, and enters a third drying oven after passing through a comma scraper;
6) and the film coming out of the third oven is continuously wound on a winding core through a winding device to finally obtain a multilayer composite film product.
6. The method as claimed in claim 5, wherein the air speed of the air knife is 5-15 m/min, and the air temperature is 50-120 ℃.
7. The method as claimed in claim 5, wherein the maximum drying temperature of the first oven, the second oven and the third oven is 75-105 ℃; the maximum drying temperature of the crosslinking modification unit is 50-80 ℃; the wind speed of all the ovens and drying ovens is 1-5 m/s.
8. The method of claim 5, wherein the maximum drying temperature of the first oven, the second oven, and the third oven is 95-105 ℃; the maximum drying temperature of the crosslinking modification unit is 70-80 ℃; the air speed of all ovens and drying ovens was 3-5 m/s.
9. The method of claim 5, wherein the coating speed of the coating device is 1-10 m/min and the effective coating width of the film is determined by the unwound base film.
10. The method according to claim 5, wherein the temperatures of the coating liquid are controlled between-5 ℃ and-5 ℃ in the circulation refrigeration devices of the first coating unit and the third coating unit.
11. The method according to claim 5, wherein the temperatures of the coating liquid are controlled between-5 ℃ and 0 ℃ in the circulation refrigeration devices of the first coating unit and the third coating unit.
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