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CN-121989400-A - Tape-casting drying equipment and system for polyimide film

CN121989400ACN 121989400 ACN121989400 ACN 121989400ACN-121989400-A

Abstract

The application provides a curtain coating drying device and a curtain coating drying system for a polyimide film, and relates to the technical field of curtain coating drying of polyimide films. The curtain coating drying equipment of the polyimide film comprises a drying box body provided with a feed inlet and a discharge outlet for materials to pass through, wherein a plurality of heating areas are formed in the drying box body, a supporting and conveying device is positioned in the drying box body and used for conveying the materials from the feed inlet to the discharge outlet, the supporting and conveying device comprises a plurality of heating rollers which are distributed at intervals along the horizontal direction, a transmission piece is used for driving the heating rollers to rotate, a conveying belt is arranged on the heating rollers in a tensioning sleeve mode, the plurality of drying devices are correspondingly distributed in the plurality of heating areas one by one, and the plurality of heating areas are distributed in the drying box body along a conveying path array of the conveying belt. The equipment can solve the problems of surface flaws caused by hot air disturbance glue solution, surface drying phenomenon and hole defect formed by too fast devolatilization of the surface and the inside of the adhesive film and severe shrinkage when the adhesive film is peeled off from a substrate in the existing tape casting drying technology of the polyimide film.

Inventors

  • YANG JIMING
  • TAO RUOYUAN
  • LI ZEQIU
  • HU QILIN
  • ZHOU ZHENGXIANG

Assignees

  • 中石油(上海)新材料研究院有限公司
  • 中国石油天然气股份有限公司

Dates

Publication Date
20260508
Application Date
20241101

Claims (10)

  1. 1. A tape-casting and drying apparatus for a polyimide film, comprising: The drying box body (100), wherein the drying box body (100) is provided with a feed inlet (110) and a discharge outlet (120) for materials to pass through, and a plurality of heating areas are formed in the drying box body (100); The support conveying device (500), the support conveying device (500) is located in the drying box body (100), the support conveying device (500) is used for conveying materials from the feed inlet (110) to the discharge outlet (120), the support conveying device (500) comprises a plurality of heating rollers (510), a transmission piece and a conveying belt (520), the heating rollers (510) are distributed at intervals along the horizontal direction, two ends of the heating rollers (510) are rotationally connected with the side wall of the drying box body (100) through the transmission piece, the transmission piece is used for driving the heating rollers (510) to rotate, the conveying belt (520) is tightly sleeved on the heating rollers (510), the materials are glue at the feed inlet (110), and the materials are glue films at the discharge outlet (120); The drying devices are distributed in the heating areas in a one-to-one correspondence manner, the heating areas are distributed in the drying box body (100) along a conveying path array of the conveying belt (520), and at least one drying device heats and dries the materials in an electric heating manner.
  2. 2. The apparatus for tape-casting drying of polyimide film according to claim 1, wherein the drying means is a flat plate heating means (300) or a hot air heating means (400), and at least one of the drying means is the flat plate heating means (300), and the flat plate heating means (300) heat-dries the material by electric heating.
  3. 3. The apparatus for tape-casting drying of polyimide film according to claim 2, wherein the heating surface of the flat heating device (300) is disposed in opposite parallel to the belt surface of the conveyor belt (520), a distance between the heating surface of the flat heating device (300) and the belt surface of the conveyor belt (520) is 5-30cm, an air outlet of the hot air heating device (400) is directed toward the belt surface of the conveyor belt (520), and a distance between the air outlet of the hot air heating device (400) and the belt surface of the conveyor belt (520) is 5-30cm.
  4. 4. The apparatus according to claim 2, wherein the flat heating device (300) comprises a conductive housing (310), a resistance wire (320) and an insulating housing (330), the resistance wire (320) is connected to the inside of the conductive housing (310) or is embedded on the surface of the conductive housing (310), the insulating housing (330) is coated outside the conductive housing (310), and the insulating housing (330) is connected to the drying box (100).
  5. 5. The apparatus for tape-casting and drying of polyimide film according to claim 2, wherein the flat plate heating device (300) comprises a heating housing (340), a heating circulation pipe (350), a heating medium heater (360) and a heat-retaining housing (370), the heating housing (340) is communicated with the heating medium heater (360) through the heating circulation pipe (350), the heat-retaining housing (370) is coated outside the heating housing (340), and the heat-retaining housing (370) is connected with the drying cabinet (100).
  6. 6. The apparatus for tape-casting drying of polyimide film according to claim 2, wherein the hot air heating device (400) comprises a heating device, a hot air blower (410), an air supply duct (420) and a tuyere (430), the hot air blower (410) is located between the heating device and the tuyere (430), the hot air blower (410) is configured to blow hot air generated by the heating device to the tuyere (430) through the air supply duct (420), and an air outlet of the tuyere (430) is directed toward a belt surface of the conveyor belt (520).
  7. 7. The apparatus according to any one of claims 1 to 6, further comprising an air circulation device (600), wherein the air circulation device (600) comprises a circulation air pipe (610), a circulation fan (620), an exhaust pipe (611) and an exhaust valve (612), both ends of the circulation air pipe (610) are respectively communicated with the inside of the drying cabinet (100), one end of the circulation air pipe (610) is provided with the exhaust pipe (611), the exhaust pipe (611) is provided with the exhaust valve (612), and the circulation fan (620) is mounted on the circulation air pipe (610).
  8. 8. The apparatus according to any one of claims 1 to 6, wherein a pull roll (530) is rotatably provided in the drying box (100), and the pull roll (530) is located at the discharge port (120), and the pull roll (530) is used to pull the material out of the drying box (100) through the discharge port (120).
  9. 9. A casting drying system of a polyimide film, characterized by comprising a casting apparatus (200) and the casting drying device of a polyimide film according to any one of claims 1 to 8 corresponding to the casting apparatus (200).
  10. 10. The tape-casting and drying system for polyimide film according to claim 9, further comprising a reaction device (700), wherein the reaction device (700) is used for generating a polyamic acid solution, Casting device (200), casting device (200) including at least one material storage tank (210), delivery pump (220), delivery pipe (230), blender (240) and die (250), material storage tank (210) are used for storing at least one of polyamic acid solution, chemical imidization reagent solution, auxiliary agent solution, at least one material storage tank (210) pass through delivery pipe (230) with blender (240) intercommunication, blender (240) are used for receiving from at least one material storage tank (210) storage material, and mix the storage material to form mixed storage material solution, delivery pump (220) are installed on delivery pipe (230), delivery pipe (230) are used for with the material is from at least one material storage tank (210) to blender (240), die (250) are connected with blender (240), die (250) are located drying cabinet (100), and extrusion die (250) are located towards conveyer belt (520) of die head (250).

Description

Tape-casting drying equipment and system for polyimide film Technical Field The application relates to the technical field of curtain coating and drying of polyimide films, in particular to curtain coating and drying equipment and system of polyimide films. Background Polyimide film has excellent mechanical property, electrical insulation property, high and low temperature resistance, chemical stability and other characteristics, and has been widely applied to the fields of aerospace, electronic information, rail traffic, new energy and the like, and plays an irreplaceable role of other materials. However, polyimide is a refractory polymer which is not only difficult to dissolve, but also refractory, the molding processing of the film has higher technical difficulty, and the large-scale production of the polyimide film with high quality always faces the series engineering problem. The polyimide film products currently in industrialization are mainly manufactured by casting, drying, stretching, high-temperature treatment and annealing based on soluble polyamic acid solution or mixed solution (precursor solution) of the polyamic acid solution and chemical imidizing agent. The main process flow is that firstly, the precursor solution is cast to the surface of an annular steel belt through a die head to form a solution film, then the solution film sequentially passes through a blast drying chamber with gradient temperature design along with the running of the annular steel belt to devolatilize, a film containing a certain amount of solvent is obtained, and finally, the film is peeled off from the annular steel belt to be stretched, treated at high temperature and annealed to obtain the polyimide film product. In the manufacturing technology, the regulation and control of the solvent content, the internal micro morphology and the molecular structure and the apparent state of the adhesive film directly influence the performance and the apparent quality of the final polyimide film, and meanwhile, whether the adhesive film can be stably prepared is more related to the control of the continuity and the manufacturing cost of the whole manufacturing process. In the prior art, the preparation of the adhesive film mainly adopts the forced air circulation drying technology, but because the solution film formed by extruding and casting the precursor solution through a die head has fluidity, the solution film is extremely easy to generate appearance defects such as surface wrinkles, lines, chromatic aberration and the like due to the disturbance of hot air when the solution film is subjected to forced air drying by adopting the device. Meanwhile, when in forced air drying, the volatilization speed of the solvent on the surface layer of the solution film is higher than that of the inner layer, a hard solidified layer is easily formed on the surface layer to prevent the solvent on the inner layer from evaporating, so that the content of the solvent in the adhesive film is high, namely, the common phenomenon of surface drying is further caused, and the adhesive film is further torn due to insufficient mechanical strength in the later stretching stage. In addition, during the forced air drying, the adhesive film is subjected to high temperature treatment, and the internal solvent is rapidly evaporated, so that internal 'holes' defect is caused, and the performance of the final polyimide film product is insufficient. In addition, the solution film is subjected to forced air drying treatment from normal temperature to high temperature (within 200 ℃) to obtain a film, the film is directly transferred from high temperature to room temperature and peeled off, and the rapid cooling process is easy to cause shrinkage and curling of two sides of the film, so that the two sides of the film cannot be continuously fixed by a clamp to generate the problem of production interruption. Therefore, the present application has devised and developed a new casting drying apparatus capable of solving the shortcomings in the existing casting drying apparatus. Disclosure of Invention The application provides a curtain coating drying device and a curtain coating drying system for a polyimide film, which can solve the problems of surface flaws caused by hot air disturbance glue solution, surface drying phenomenon and hole defect which are formed by too fast devolatilization of the surface and the inside of a glue film and severe shrinkage when the glue film is peeled off a substrate in the curtain coating drying technology of the existing polyimide film. In a first aspect, an embodiment of the present application provides a casting drying apparatus for a polyimide film, including: the drying box body is provided with a plurality of heating areas for transferring materials from a feed inlet to a discharge outlet; the supporting and conveying device is positioned in the drying box body and is used for conveying the materials from the feeding hole to the