CN113681946A - Forming device and method for chemical imidization polyimide film - Google Patents

Forming device and method for chemical imidization polyimide film Download PDF

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Publication number
CN113681946A
CN113681946A CN202110976036.3A CN202110976036A CN113681946A CN 113681946 A CN113681946 A CN 113681946A CN 202110976036 A CN202110976036 A CN 202110976036A CN 113681946 A CN113681946 A CN 113681946A
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China
Prior art keywords
polyimide film
heat setting
setting chamber
temperature zone
polyimide
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CN202110976036.3A
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Chinese (zh)
Inventor
张春华
秦志红
于耀伟
白汝佳
杨丁卯
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Guangdong Shuangla Technology Co ltd
Guangdong Simcheng Plastics Machinery Co Ltd
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Guangdong Shuangla Technology Co ltd
Guangdong Simcheng Plastics Machinery Co Ltd
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Priority to CN202110976036.3A priority Critical patent/CN113681946A/en
Publication of CN113681946A publication Critical patent/CN113681946A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0092—Drying moulded articles or half products, e.g. preforms, during or after moulding or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2079/00—Use of polymers having nitrogen, with or without oxygen or carbon only, in the main chain, not provided for in groups B29K2061/00 - B29K2077/00, as moulding material
    • B29K2079/08—PI, i.e. polyimides or derivatives thereof
    • B29K2079/085—Thermoplastic polyimides, e.g. polyesterimides, PEI, i.e. polyetherimides, or polyamideimides; Derivatives thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Moulding By Coating Moulds (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The invention discloses a forming device and a method of a chemical imidization polyimide film, wherein the forming device comprises a mixer, an extrusion head, a material receiving belt, a heat setting chamber and a winding machine which are arranged in sequence; the extrusion head is arranged at a discharge port of the mixer, the peripheral wall of the material receiving belt is provided with a material receiving surface, and the material receiving surface is rotatably arranged at an extrusion end of the extrusion head; the heat setting chamber comprises a hot air assembly, an infrared generation assembly and a nitrogen generation assembly, the hot air assembly is arranged close to the feeding end of the heat setting chamber, and the infrared generation assembly is arranged close to the discharging end of the heat setting chamber; the nitrogen generating assembly is arranged at the top of the heat setting chamber, and the inside of the nitrogen generating assembly is communicated with the inside of the heat setting chamber. The forming device for the chemical imidization polyimide film, which is provided by the technical scheme, is beneficial to preparing the transparent, ultrathin and uniform-thickness chemical imidization polyimide film. Further provides a forming method of the chemical imidization polyimide film, which has simple steps and convenient operation.

Description

Forming device and method for chemical imidization polyimide film
Technical Field
The invention relates to the technical field of polyimide film forming equipment, in particular to a forming device and a forming method of a chemical imidization polyimide film.
Background
With the rapid development of the electronic information industry, the high integration, high density and high speed of electronic equipment enable a circuit or a chip to rapidly accumulate heat in a tiny limited space, and whether the circuit or the chip can dissipate heat in time becomes a key that affects the service life, the operation stability and the safety performance of components. Polyimide (PI) film is widely applied to the field of electronics and electricity as a high-performance insulating material due to various excellent performances such as excellent electrical performance, flame retardant performance, high temperature resistance, radiation resistance and the like, and is incomparable with other plastic films such as nylon films, polyester films, polypropylene films, polyethylene films and the like.
At present, the chemical imidization polyimide film is generally prepared by a solvent casting molding method in industrial production, specifically, the polyimide film is prepared by preparing polyamic acid, dissolving the polyamic acid in an organic solvent and then preparing the polyimide film by a casting method. However, the method is limited by the polyimide film forming equipment, and the polyimide film prepared by the existing solvent casting forming method has thick thickness and low thickness uniformity, so that the use requirement cannot be met.
Disclosure of Invention
The invention aims to provide a forming device of a chemical imidization polyimide film, which is beneficial to preparing the transparent, ultrathin and uniform-thickness chemical imidization polyimide film, and has simple and reasonable structure and convenient and quick installation.
The invention also aims to provide a forming method of the chemical imidization polyimide film, which has simple steps and convenient operation and is beneficial to overcoming the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a forming device of a chemical imidization polyimide film comprises a mixer, an extrusion head, a material receiving belt, a heat setting chamber and a winding machine which are arranged in sequence;
the extruding head is arranged at a discharge port of the mixer and used for extruding polyimide slurry, a material receiving surface is arranged on the peripheral wall of the material receiving belt and can be rotatably arranged at an extruding end of the extruding head, the material receiving surface is used for receiving and transmitting a polyimide film, and the polyimide film discharged from the material receiving belt is wound by the winding machine after passing through the heat setting chamber;
the hot setting chamber comprises a hot air assembly, an infrared generation assembly and a nitrogen generation assembly, the hot air assembly and the infrared generation assembly are arranged inside the hot setting chamber, the hot air assembly is arranged close to the feeding end of the hot setting chamber, and the infrared generation assembly is arranged close to the discharging end of the hot setting chamber; the nitrogen generation assembly is arranged at the top of the heat setting chamber, and the inside of the nitrogen generation assembly is communicated with the inside of the heat setting chamber.
Preferably, still include first commentaries on classics roller and second commentaries on classics roller, first commentaries on classics roller with the second is changeed the roller and is rotated in step, connect the material area around first commentaries on classics roller with the lateral wall of second commentaries on classics roller, first commentaries on classics roller with the rotation drive of second commentaries on classics roller connect the rotation in material area.
Preferably, the thickness measuring device further comprises a first thickness gauge and a tenter, the first thickness gauge and the tenter are arranged between the material receiving belt and the heat setting machine, the first thickness gauge is arranged close to the material receiving belt, and the tenter is arranged close to the heat setting machine; the first thickness gauge is used for measuring the casting thickness of the polyimide film, and the tenter is used for stretching the polyimide film.
Preferably, still include second calibrator and bead cutter, the second calibrator with the bead cutter set up in heat setting machine with between the rolling machine, just the second calibrator is close to the heat setting machine sets up, the bead cutter is close to the rolling machine sets up, the second calibrator is used for measuring the design thickness of polyimide film, the bead cutter is used for cutting edge the polyimide film.
Preferably, the mixer is a pin mixer;
the head of the extrusion head is rectangular, the length of the extrusion head is 300-1000 mm, and the width of a film seam of the extrusion head is 10-200 mu m;
the material that connects the material area is the stainless steel, just the length that connects the material area is 9 ~ 30m, and the width is 300 ~ 1600mm, and surface roughness < 0.02 mu m.
Preferably, the length of the heat setting chamber is 10000-15000 mm;
the interior of the heat setting chamber sequentially comprises a first temperature zone, a second temperature zone, a third temperature zone, a fourth temperature zone, a fifth temperature zone and a sixth temperature zone along the discharging direction, the temperatures of the first temperature zone and the second temperature zone are 240-260 ℃, the temperatures of the third temperature zone and the fourth temperature zone are 280-320 ℃, the temperature of the fifth temperature zone is 400-500 ℃, and the temperature of the sixth temperature zone is 550-650 ℃.
A forming method of a chemical imidization polyimide film, which uses the forming device of the chemical imidization polyimide film, comprises the following steps:
A. adding a polyimide film raw material into the mixer, extruding and casting the polyimide film raw material to the material receiving belt through the extrusion head, and receiving the material through the material receiving belt to obtain a polyimide cast film;
B. introducing nitrogen into the heat setting chamber by using a nitrogen generation assembly, and sending the polyimide cast film into the heat setting chamber for drying and setting after the thickness of the polyimide cast film is measured by the first thickness gauge and stretched by the tenter to obtain a polyimide setting film;
C. and (3) carrying out thickness measurement on the polyimide shaping film by the second thickness gauge, and edge cutting by the edge cutting machine, and then rolling by using the rolling machine to obtain the chemical imidization polyimide film.
Preferably, in the step A, the working temperature of the mixer is lower than 0 ℃, the rotating speed of the mixer is 50-200 rpm, and the working temperature of the extrusion head is-20-80 ℃.
Preferably, in step B, the nitrogen is introduced at a concentration of > 99.99% and at a pressure of > 0.6 MPa.
Preferably, in the step C, the thickness of the chemical imidization polyimide film is 12.5 to 75 μm.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
1. the extrusion head is arranged at the discharge port of the mixer, so that technicians can adjust the angle of the extrusion head according to the production requirements of different films, and the universality of the forming device is effectively enhanced.
2. The heat setting chamber comprises a hot air assembly and an infrared generation assembly, and an infrared drying mode is matched with a hot air drying mode, so that the polyimide film can be better and more effectively set and dried.
3. The nitrogen is introduced into the heat setting chamber through the nitrogen generation assembly, so that the setting and drying of the polyimide film are carried out under the nitrogen environment, the yellowing of the polyimide film in the preparation process is avoided, and the reduction of the optical transmittance of the prepared chemical imidization transparent polyimide film can be effectively prevented.
Drawings
FIG. 1 is a schematic structural view of an apparatus for forming a polyimide film by chemical imidization according to the present invention.
FIG. 2 is a schematic flow chart of a method for forming a polyimide film by chemical imidization according to the present invention.
Wherein: the device comprises a mixer 1, an extrusion head 2, a material receiving belt 3, a first rotating roller 4, a second rotating roller 5, a first thickness gauge 6, a tenter 7, a heat setting chamber 8, a hot air assembly 81, an infrared generation assembly 82, a nitrogen generation assembly 83, a second thickness gauge 9, an edge trimmer 10 and a winding machine 11.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the features defined as "first" and "second" may explicitly or implicitly include one or more of the features, whether explicit or implicit, for distinguishing between the described features, whether sequential or explicit.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical scheme provides a forming device of a chemical imidization polyimide film, which comprises a mixer 1, an extrusion head 2, a material receiving belt 3, a heat setting chamber 8 and a winding machine 11 which are arranged in sequence;
the extruding head 2 is arranged at a discharge port of the mixer 1, the extruding head 2 is used for extruding polyimide slurry, a receiving surface is arranged on the peripheral wall of the receiving belt 3, the receiving surface is rotatably arranged at an extruding end of the extruding head 2, the receiving surface is used for receiving and transmitting the polyimide slurry, and a polyimide film discharged from the receiving belt 3 is wound by the winding machine 11 after passing through the heat setting chamber 8;
the heat setting chamber 8 comprises a hot air component 81, an infrared generation component 82 and a nitrogen generation component 83, the hot air component 81 and the infrared generation component 82 are installed inside the heat setting chamber 8, the hot air component 81 is arranged close to the feeding end of the heat setting chamber 8, and the infrared generation component 82 is arranged close to the discharging end of the heat setting chamber 8; the nitrogen generating assembly 83 is installed on the top of the heat setting chamber 8, and the inside of the nitrogen generating assembly 83 and the inside of the heat setting chamber 8 are communicated with each other.
At present, polyimide films are generally prepared by a thermal imidization tape casting molding method in industrial production, specifically, polyamic acid is dissolved in an organic solvent, and then the polyimide films are prepared by a tape casting heating method. However, the method is limited by the technology and the forming equipment of the thermal imidization polyimide film, and the polyimide film prepared by the existing forming method of thermal imidization tape casting has thick thickness, poor performance and low thickness uniformity, and cannot meet the use requirements of high-end, electronic and display fields.
In order to prepare ultra-thin and even chemical imidization polyimide film of thickness, this technical scheme provides a forming device of chemical imidization polyimide film, including the blender 1 that is used for mixing the polyimide film raw materials that sets gradually, be used for extruding the first 2 of extruding of polyimide film, be used for catching and conveying the material area 3 that connects of polyimide thick liquids, be used for carrying out the heat setting room 8 of design stoving and the rolling machine 11 that is used for rolling the polyimide film that the preparation was accomplished to the polyimide film.
Specifically, the extrusion head 2 is mounted at the discharge port of the mixer 1, so that technicians can adjust the angle of the extrusion head 2 according to production requirements (such as thickness, uniformity and the like) of different films, and the universality of the forming device is effectively enhanced; connect the periphery wall in material area 3 to be equipped with and connect the material face, connect the material face rotationally install in the end of extruding head 2, connect the material face to be used for catching and conveying polyimide film, from the polyimide film that connects the 3 ejection of compact in material area by the rolling machine 11 rolling behind heat setting chamber 8, connect the polyimide film curtain coating after being convenient for extrude of the setting in material area 3 to connect the material face on.
More specifically, the heat setting chamber 8 comprises a hot air component 81, an infrared generation component 82 and a nitrogen generation component 83, the hot air component 81 and the infrared generation component 82 are installed inside the heat setting chamber 8, the hot air component 81 is arranged close to the feeding end of the heat setting chamber 8, and the infrared generation component 82 is arranged close to the discharging end of the heat setting chamber 8; the nitrogen generation component 83 is installed at the top of the heat setting chamber 8, the nitrogen generation component 83 is communicated with the inside of the heat setting chamber 8, nitrogen is introduced into the heat setting chamber 8 through the nitrogen generation component 83 according to the technical scheme, the setting and drying of the polyimide film are carried out under the nitrogen environment, the yellowing of the polyimide film in the preparation process can be avoided, and the reduction of the optical transmittance of the prepared chemical imidization polyimide film can be effectively prevented.
Further, the material receiving belt comprises a first rotating roller 4 and a second rotating roller 5, wherein the first rotating roller 4 and the second rotating roller 5 rotate synchronously, the material receiving belt 3 surrounds the first rotating roller 4 and the side wall of the second rotating roller 5, and the rotation of the first rotating roller 4 and the second rotating roller 5 drives the rotation of the material receiving belt 3.
In an embodiment of this technical scheme, forming device still includes first commentaries on classics roller 4 and second commentaries on classics roller 5, and first commentaries on classics roller 4 and the synchronous rotation of second commentaries on classics roller 5 connect material area 3 around the lateral wall of first commentaries on classics roller 4 and second commentaries on classics roller 5, and the rotation of first commentaries on classics roller 4 and second commentaries on classics roller 5 drives the rotation of connecting material area 3, is favorable to promoting the operation stability of connecting material area 3, ensures that the smooth curtain coating of polyimide film connects material area 3.
Further, a first thickness gauge 6 and a tenter 7 are included, the first thickness gauge 6 and the tenter 7 are disposed between the material receiving belt 3 and the heat setting machine 8, the first thickness gauge 6 is disposed near the material receiving belt 3, and the tenter 7 is disposed near the heat setting machine 8; the first thickness gauge 6 is used for measuring the casting thickness of the polyimide film, and the tenter 7 is used for stretching the polyimide film.
In an embodiment of the present disclosure, the forming device further includes a first thickness gauge 6 and a tenter 7, the first thickness gauge 6 and the tenter 7 are disposed between the material receiving belt 3 and the heat setting machine 8, the first thickness gauge 6 is disposed near the material receiving belt 3, and the tenter 7 is disposed near the heat setting machine 8; first calibrator 6 is used for measuring the curtain coating thickness of polyimide film, and the technical staff of being convenient for adjusts and/or changes the use specification of extruding head 2 according to the curtain coating thickness of polyimide film, promotes forming device's controllability, and tentering frame 7 is used for stretching the polyimide film to realize the final required stretching range of polyimide film.
Further, the polyimide film edge trimmer comprises a second thickness gauge 9 and an edge trimmer 10, wherein the second thickness gauge 9 and the edge trimmer 10 are arranged between the heat setting machine 8 and the winding machine 11, the second thickness gauge 9 is close to the heat setting machine 8, the edge trimmer 10 is close to the winding machine 11, the second thickness gauge 9 is used for measuring the setting thickness of the polyimide film, and the edge trimmer 10 is used for trimming the polyimide film.
In an embodiment of this technical scheme, forming device still includes second thickness gauge 9 and bead cutter 10, second thickness gauge 9 and bead cutter 10 set up between heat setting machine 8 and rolling machine 11, and second thickness gauge 9 is close to heat setting machine 8 and sets up, bead cutter 10 is close to rolling machine 11 and sets up, second thickness gauge 9 is used for measuring the design thickness of polyimide film, be favorable to detecting and holding the finished product quality of polyimide film, bead cutter 10 is used for cutting edge the polyimide film, guarantee that the wind-up roll width is unanimous with the film range.
Further, the mixer 1 is a pin mixer;
the shape of the head of the extrusion head 2 is rectangular, the length of the extrusion head 2 is 300-1000 mm, and the width of a film seam of the extrusion head 2 is 10-200 mu m;
the material that connects material area 3 is the stainless steel, just the length that connects material area 3 is 9 ~ 30m, and the width is 300 ~ 1600mm, and surface roughness < 0.02 mu m.
The mixer 1 in the technical scheme is a needle mixer, so that the space is compact and the mixing effect is good; the head shape of the extrusion head 2 is rectangular, the length of the extrusion head 2 is 300-1000 mm, and the width of a film seam of the extrusion head 2 is 10-200 mu m, so that the curtain coating of a polyimide film is facilitated; connect the material in material area 3 to be the stainless steel, not fragile material area 3 that connects, and the length that connects material area 3 is 9 ~ 30m, and the width is 300 ~ 1600mm, and the roughness is less than 0.02 mu m, is favorable to adapting to the curtain coating demand of extruding the film of more different specifications, ensures to extrude the laminating of film and connect the material face in material area 3.
Further, the length of the heat setting chamber 8 is 10000 to 15000 mm;
the interior of the heat setting chamber 8 sequentially comprises a first temperature zone, a second temperature zone, a third temperature zone, a fourth temperature zone, a fifth temperature zone and a sixth temperature zone along the discharging direction, the temperatures of the first temperature zone and the second temperature zone are 240-260 ℃, the temperatures of the third temperature zone and the fourth temperature zone are 280-320 ℃, the temperature of the fifth temperature zone is 400-500 ℃, and the temperature of the sixth temperature zone is 550-650 ℃.
In the technical scheme, the length of the heat setting chamber 8 is 10000-15000 mm, which is beneficial to fully drying the polyimide film; the interior of the heat setting chamber 8 sequentially comprises a first temperature zone, a second temperature zone, a third temperature zone, a fourth temperature zone, a fifth temperature zone and a sixth temperature zone along the discharging direction, the temperature of the first temperature zone and the temperature of the second temperature zone are 240-260 ℃, the temperature of the third temperature zone and the temperature of the fourth temperature zone are 280-320 ℃, the temperature of the fifth temperature zone is 400-500 ℃, and the temperature of the sixth temperature zone is 550-650 ℃, so that the drying effect of the polyimide film is favorably improved.
This technical scheme has still provided the forming method of chemical imidization polyimide film, uses the forming device of above-mentioned chemical imidization polyimide film, includes the following step:
A. adding a polyimide film raw material into the mixer 1, extruding and casting the polyimide film raw material to the material receiving belt 3 through the extrusion head 2, and receiving materials through the material receiving belt 3 to obtain a polyimide cast film;
B. introducing nitrogen into the heat setting chamber 8 by using a nitrogen generation assembly 83, measuring the thickness of the polyimide cast film by using the first thickness gauge 6, stretching the polyimide cast film by using the tenter 7, and then sending the polyimide cast film into the heat setting chamber 8 for drying and setting to obtain a polyimide setting film;
C. and (3) after the polyimide shaping film is subjected to thickness measurement by the second thickness gauge 9 and edge cutting by the edge cutting machine 10, winding by the winding machine 11 to obtain the chemical imidization polyimide film.
The technical scheme also provides a forming method of the chemical imidization polyimide film, which has simple steps and convenient operation and is beneficial to preparing the ultrathin chemical imidization polyimide film with uniform thickness.
In step a, the working temperature of the mixer 1 is lower than 0 ℃, the rotation speed of the mixer 1 is 50 to 200rpm, and the working temperature of the extrusion head 2 is-20 to 80 ℃.
In one embodiment of the technical scheme, in the step A, the working temperature of the mixer 1 is lower than 0 ℃, the rotating speed of the mixer 1 is 50-200 rpm, so that the raw materials of the polyimide film can be fully mixed, and the working temperature of the extrusion head 2 is-20-80 ℃, so that the polyimide film can be smoothly extruded.
Furthermore, in the step B, the nitrogen is introduced at a concentration of more than 99.99% and a pressure of more than 0.6 MPa.
In an embodiment of the present technical solution, in the step B, the nitrogen is introduced at a concentration of more than 99.99% and a pressure of more than 0.6Mpa, which is beneficial to further preventing the polyimide film from yellowing during the preparation process, thereby more effectively preventing the optical transmittance of the prepared chemical imidization polyimide film from decreasing.
In step C, the thickness of the polyimide film is 12.5 to 75 μm.
The thickness of the chemical imidization polyimide film prepared by the forming method of the chemical imidization polyimide film in the technical scheme can reach 12.5-75 mu m, and the use requirement of the polyimide film is met.
Example 1-method for Forming a polyimide film by chemical imidization
A. Adding a polyimide film raw material into a mixer, extruding and casting the polyimide film raw material to a material receiving belt through an extrusion head, and receiving the material through the material receiving belt to obtain a polyimide cast film; wherein the width of a film seam of the extrusion head is 12.5 mu m, the working temperature of the mixer is lower than 0 ℃, the rotating speed of the mixer is 200rpm, and the working temperature of the extrusion head 2 is-20-80 ℃;
B. utilize nitrogen gas generation subassembly to let in nitrogen gas to the heat setting room, with polyimide curtain coating film through first calibrator thickness measurement, through the tenter according to 1: stretching at a stretch ratio of 1.08, and then sending into a heat setting chamber for drying and setting to obtain a polyimide setting film, wherein the introduction concentration of nitrogen is 99.99%, and the introduction pressure is 0.7 Mpa;
C. and (3) measuring the thickness of the polyimide shaped film by a second thickness gauge, cutting edges by an edge trimmer, and winding by using a winding machine to obtain the chemical imidization polyimide film.
The thickness of the obtained chemical imidization polyimide film was measured, and the tensile strength and tensile elastic modulus of the obtained chemical imidization polyimide film were measured according to GB13022-91 "test methods for tensile Properties of Plastic films". The chemically imidized polyimide film obtained according to the preparation method of example 1 had a thickness of 12.5 μm, a tensile strength of 320MPa, and a tensile elastic modulus of 3.5 Gpa.
Example 2-method for Forming a polyimide film by chemical imidization
The same molding apparatus as in example 1 was used, except that the extrusion head was changed to a film slit width of 25 μm. The chemical imidized polyimide film obtained according to the preparation method of example 2 had a thickness of 25 μm, a tensile strength of 307Mpa, and a tensile elastic modulus of 3.7 Gpa.
EXAMPLE 3A method for Forming a polyimide film by chemical imidization
The same molding apparatus as in example 1 was used, except that the extrusion head was changed to 75 μm in the slit width. The transparent chemical imidized polyimide film obtained according to the preparation method of example 3 had a thickness of 75 μm, a tensile strength of 271MPa, and a tensile elastic modulus of 3.4 Gpa.
From the performance test results of examples 1 to 3, it can be seen that the chemical imidization polyimide film prepared by the present technical scheme has a small thickness, a uniform thickness, and excellent tensile properties.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.

Claims (10)

1. The utility model provides a forming device of chemical imidization polyimide film which characterized in that: comprises a mixer, an extrusion head, a material receiving belt, a heat setting chamber and a winding machine which are arranged in sequence;
the extruding head is arranged at a discharge port of the mixer and used for extruding polyimide slurry, a material receiving surface is arranged on the peripheral wall of the material receiving belt and can be rotatably arranged at an extruding end of the extruding head, the material receiving surface is used for receiving and transmitting the polyimide slurry, and a polyimide film discharged from the material receiving belt is wound by the winding machine after passing through the heat setting chamber;
the hot setting chamber comprises a hot air assembly, an infrared generation assembly and a nitrogen generation assembly, the hot air assembly and the infrared generation assembly are arranged inside the hot setting chamber, the hot air assembly is arranged close to the feeding end of the hot setting chamber, and the infrared generation assembly is arranged close to the discharging end of the hot setting chamber; the nitrogen generation assembly is arranged at the top of the heat setting chamber, and the inside of the nitrogen generation assembly is communicated with the inside of the heat setting chamber.
2. The apparatus for forming a chemically imidized polyimide film according to claim 1, wherein: still include first commentaries on classics roller and second commentaries on classics roller, first commentaries on classics roller with the second changes the synchronous rotation of roller, connect the material area around first commentaries on classics roller with the lateral wall of second commentaries on classics roller, first commentaries on classics roller with the rotation drive of second commentaries on classics roller connect the rotation in material area.
3. The apparatus for forming a chemically imidized polyimide film according to claim 2, wherein: the first thickness gauge and the tenter are arranged between the material receiving belt and the heat setting machine, the first thickness gauge is arranged close to the material receiving belt, and the tenter is arranged close to the heat setting machine; the first thickness gauge is used for measuring the casting thickness of the polyimide film, and the tenter is used for stretching the polyimide film.
4. The apparatus for forming a chemically imidized polyimide film according to claim 3, wherein: still include second calibrator and bead cutter, the second calibrator with the bead cutter set up in heat setting machine with between the rolling machine, just the second calibrator is close to the heat setting machine sets up, the bead cutter is close to the rolling machine sets up, the second calibrator is used for measuring the design thickness of polyimide film, the bead cutter is used for cutting edge to the polyimide film.
5. The apparatus for forming a chemically imidized polyimide film according to claim 4, wherein: the mixer is a needle mixer;
the head of the extrusion head is rectangular, the length of the extrusion head is 300-1000 mm, and the width of a film seam of the extrusion head is 10-200 mu m;
the material that connects the material area is the stainless steel, just the length that connects the material area is 9 ~ 30m, and the width is 300 ~ 1600mm, and surface roughness < 0.02 mu m.
6. The apparatus for forming a chemically imidized polyimide film according to claim 4, wherein: the length of the heat setting chamber is 10000-15000 mm;
the interior of the heat setting chamber sequentially comprises a first temperature zone, a second temperature zone, a third temperature zone, a fourth temperature zone, a fifth temperature zone and a sixth temperature zone along the discharging direction, the temperatures of the first temperature zone and the second temperature zone are 240-260 ℃, the temperatures of the third temperature zone and the fourth temperature zone are 280-320 ℃, the temperature of the fifth temperature zone is 400-500 ℃, and the temperature of the sixth temperature zone is 550-650 ℃.
7. A method for forming a chemically imidized polyimide film, using the apparatus for forming a chemically imidized polyimide film according to any one of claims 4 to 6, comprising the steps of:
A. adding a polyimide film raw material into the mixer, extruding and casting the polyimide film raw material to the material receiving belt through the extrusion head, and receiving the material through the material receiving belt to obtain a polyimide cast film;
B. introducing nitrogen into the heat setting chamber by using a nitrogen generation assembly, and sending the polyimide cast film into the heat setting chamber for drying and setting after the thickness of the polyimide cast film is measured by the first thickness gauge and stretched by the tenter to obtain a polyimide setting film;
C. and (3) carrying out thickness measurement on the polyimide shaping film by the second thickness gauge, and edge cutting by the edge cutting machine, and then rolling by using the rolling machine to obtain the chemical imidization polyimide film.
8. The method of claim 7, wherein the polyimide film is formed by a chemical imidization process, comprising the steps of: in the step A, the working temperature of the mixer is lower than 0 ℃, the rotating speed of the mixer is 50-200 rpm, and the working temperature of the extrusion head is-20-80 ℃.
9. The method of claim 7, wherein the polyimide film is formed by a chemical imidization process, comprising the steps of: in the step B, the nitrogen is introduced with the concentration of more than 99.99 percent and the pressure of more than 0.6 Mpa.
10. The method of claim 7, wherein the polyimide film is formed by a chemical imidization process, comprising the steps of: in the step C, the thickness of the chemical imidization polyimide film is 12.5-75 μm.
CN202110976036.3A 2021-08-24 2021-08-24 Forming device and method for chemical imidization polyimide film Pending CN113681946A (en)

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CN202110976036.3A CN113681946A (en) 2021-08-24 2021-08-24 Forming device and method for chemical imidization polyimide film

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CN202110976036.3A CN113681946A (en) 2021-08-24 2021-08-24 Forming device and method for chemical imidization polyimide film

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