Method for efficiently preparing polyimide film material

Abstract

The invention discloses a method for efficiently preparing a polyimide film material. The method comprises the following steps: S1, synthesizing polyamide acid; s2, polyamide acid solution treatment; s3, film casting is carried out; step S4, drying and imidization are carried out; and S5, rolling and post-processing are carried out. Step S6, performing subsequent treatment; according to the preparation method, through film casting and imidization treatment, rapid preparation of the polyimide film is achieved, the production efficiency is improved, common raw materials and equipment are used, the production cost is reduced, and the overall preparation method is clear in step and easy to operate and control; the polyimide film prepared by the invention has excellent insulativity, high-temperature stability, mechanical strength and chemical stability, and is suitable for application in multiple fields.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer material preparation, and specifically relates to a method for efficiently preparing polyimide film materials. Background Art

[0002] Polyimide (PI) is a polymer material with excellent properties, having excellent insulation, high-temperature stability, mechanical strength, and chemical stability, and is widely used in many fields such as aerospace, electronic information, biomedicine, and energy. However, the existing methods for preparing polyimide films have problems such as low production efficiency, complex processes, and high costs. Therefore, it is of great significance to develop a method for preparing polyimide films with high efficiency, low cost, and simple processes.

[0003] Based on this, a method for efficiently preparing polyimide film materials is designed. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a method for efficiently preparing polyimide film materials, effectively solving the problems raised in the above background.

[0005] To achieve the above object, the present invention provides the following technical solution: A method for efficiently preparing polyimide film materials, comprising the following steps:

[0006] Step S1, synthesizing polyamic acid

[0007] S1.1, raw material preparation: Select high-quality dianhydride and diamine as raw materials, and weigh the raw materials according to a molar ratio of 1:1;

[0008] S1.2, solvent dissolution: Dissolve the weighed dianhydride and diamine in a polar solvent to completely dissolve the raw materials and form a uniform solution;

[0009] S1.3, adding catalyst and accelerator: In order to improve the reaction rate and the quality of the product, add an appropriate amount of catalyst and accelerator to the solution;

[0010] S1.4, heating and stirring: Place the container containing the raw material solution on a heating device, control the temperature at 150 - 200 °C, and turn on the stirring device to stir at a stirring speed of 200 - 500 r / min to ensure sufficient contact and uniform reaction between the reactants, so that a polycondensation reaction occurs to generate a polyamic acid solution. The reaction time is 4 - 8 h until the solution viscosity reaches a predetermined value, indicating that polyamic acid has been generated;

[0011] Step S2, treating the polyamic acid solution

[0012] S2.1, Defoaming treatment: The polyamic acid solution obtained in Step 1 is subjected to defoaming treatment to remove the air bubbles in the solution;

[0013] Step S3, Casting into film

[0014] S3.1, Solution spreading: The treated polyamic acid solution is evenly spread onto the metal belt through the casting nozzle of the casting equipment, and the running speed of the metal belt is 1 - 5 m / min;

[0015] S3.2, Liquid film formation: During the running of the metal belt, a liquid film with a uniform thickness will be formed on its surface by the polyamic acid solution;

[0016] Step S4, Drying and imidization

[0017] S4.1, Drying treatment: The metal belt with the liquid film is sent into the drying oven and dried at 100 - 150 °C to evaporate part of the solvent, so that the liquid film forms a partially dried polyamic acid film, and the drying time is 8 - 12 min;

[0018] S4.2, Imidization treatment: The partially dried polyamic acid film is sent into the imidization furnace and subjected to imidization treatment at 300 - 400 °C. During the imidization process, the amide groups in the polyamic acid molecules will undergo cyclization reactions to form stable imide structures, and the imidization treatment time is 12 - 16 min;

[0019] Step S5, Rewinding and post-treatment

[0020] S5.1, Film peeling: The imidized polyimide film is peeled off from the metal belt;

[0021] S5.2, Rewinding operation: The peeled polyimide film is rewound through a rewinder, and the flatness and tension of the film are maintained during the rewinding process to avoid wrinkles and slack. The rewound film can be cut, printed, coated and other subsequent processing steps according to needs;

[0022] Step S6, Subsequent treatment

[0023] Quality inspection: The rewound polyimide film is subjected to quality inspection, including tests on appearance, thickness, tensile strength, and insulation performance, to ensure that the quality of the film meets the predetermined standards and requirements.

[0024] Preferably, in S1.1, the dianhydride is pyromellitic dianhydride, and the diamine is one of 4,4'-diaminodiphenyl ether or 4,4'-diaminodiphenylmethane.

[0025] Preferably, in S1.2, the polar solvent is one of N,N-dimethylformamide or N-methylpyrrolidone.

[0026] Preferably, in S1.2, the catalyst is one of organic acids or inorganic acids, and the accelerator is one of organic amines or hydroxybenzoic acids.

[0027] Preferably, in step S2.1, the defoaming treatment adopts the vacuum defoaming method. The solution is placed in a vacuum container, and the bubbles are removed by reducing the pressure. The treatment time is 30 - 60 min until no bubbles emerge from the solution.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] Through casting film formation and imidization treatment, the present invention realizes the rapid preparation of polyimide films, improves production efficiency, uses common raw materials and equipment, reduces production costs, and the overall preparation method has clear steps, is easy to operate and control;

[0030] The polyimide film prepared by the present invention has excellent insulation, high-temperature stability, mechanical strength and chemical stability, and is suitable for applications in multiple fields. Specific Embodiments

[0031] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0032] The present invention provides a method for efficiently preparing polyimide film materials, including the following steps:

[0033] Step S1: Synthesize polyamic acid

[0034] S1.1: Raw material preparation: Select high-quality dianhydride and diamine as raw materials, and weigh the raw materials according to a molar ratio of 1:1;

[0035] S1.2: Solvent dissolution: Dissolve the weighed dianhydride and diamine in a polar solvent to completely dissolve the raw materials and form a uniform solution;

[0036] S1.3: Add catalyst and accelerator: To improve the reaction rate and the quality of the product, add an appropriate amount of catalyst and accelerator to the solution;

[0037] S1.4. Heating and Stirring: Place the container filled with the raw material solution on a heating device, control the temperature at 150 - 200 °C, and turn on the stirring device to stir at a speed of 200 - 500 r / min to ensure sufficient contact and uniform reaction between the reactants, enabling a polycondensation reaction to occur to form a polyamic acid solution. The reaction time is 4 - 8 h until the solution viscosity reaches a predetermined value, indicating the formation of polyamic acid;

[0038] Step S2. Treatment of Polyamic Acid Solution

[0039] S2.1. Defoaming Treatment: Perform defoaming treatment on the polyamic acid solution obtained in Step 1 to remove the bubbles in the solution;

[0040] Step S3. Casting into Film

[0041] S3.1. Solution Spreading: Evenly spread the treated polyamic acid solution onto the metal belt through the casting nozzle of the casting equipment. The running speed of the metal belt is 1 - 5 m / min;

[0042] S3.2. Liquid Film Formation: During the running of the metal belt, a liquid film with a uniform thickness will form on its surface;

[0043] Step S4. Drying and Imidization

[0044] S4.1. Drying Treatment: Send the metal belt with the liquid film into the drying oven and dry it at 100 - 150 °C to evaporate part of the solvent, forming a partially dried polyamic acid film from the liquid film. The drying time is 8 - 12 min;

[0045] S4.2. Imidization Treatment: Send the partially dried polyamic acid film into the imidization furnace and perform imidization treatment at 300 - 400 °C. During the imidization process, the amide groups in the polyamic acid molecules will undergo a cyclization reaction to form a stable imide structure. The imidization treatment time is 12 - 16 min;

[0046] Step S5. Rewinding and Post - treatment

[0047] S5.1. Film Stripping: Peel the imidized polyimide film from the metal belt;

[0048] S5.2. Rewinding Operation: Rewind the peeled polyimide film through a rewinder, and maintain the flatness and tension of the film during the rewinding process to avoid wrinkles and slack. The rewound film can be cut, printed, coated, and subjected to other subsequent processing steps as needed;

[0049] Step S6. Subsequent Treatment

[0050] Quality inspection: Conduct quality inspection on the wound polyimide film, including tests on appearance, thickness, tensile strength, and insulation performance, to ensure that the film quality meets the predetermined standards and requirements.

[0051] In S1.1 of this embodiment, the dianhydride is pyromellitic dianhydride, and the diamine is one of 4,4'-diaminodiphenyl ether or 4,4'-diaminodiphenylmethane.

[0052] In S1.2 of this embodiment, the polar solvent is one of N,N-dimethylformamide or N-methylpyrrolidone.

[0053] In S1.2 of this embodiment, the catalyst is one of organic acids or inorganic acids, and the accelerator is one of organic amines or hydroxybenzoic acids.

[0054] In step S2.1 of this embodiment, the defoaming treatment adopts the vacuum defoaming method. Place the solution in a vacuum container and remove the bubbles by reducing the pressure. The treatment time is 30 - 60 min until no bubbles emerge from the solution.

[0055] Example 1:

[0056] A method for efficiently preparing a polyimide film material, comprising the following steps:

[0057] Step S1: Synthesize polyamic acid

[0058] S1.1: Raw material preparation: Select high-quality dianhydride and diamine as raw materials, and weigh the raw materials according to a molar ratio of 1:1.

[0059] S1.2: Solvent dissolution: Dissolve the weighed dianhydride and diamine in a polar solvent to completely dissolve the raw materials and form a homogeneous solution.

[0060] S1.3: Add catalyst and accelerator: To improve the reaction rate and product quality, add appropriate amounts of catalyst and accelerator to the solution.

[0061] S1.4: Heating and stirring: Place the container containing the raw material solution on a heating device, control the temperature at 150 °C, and turn on the stirring device to stir at a speed of 200 r / min to ensure sufficient contact and uniform reaction between the reactants, causing a polycondensation reaction to generate a polyamic acid solution. The reaction time is 4 h until the solution viscosity reaches a predetermined value, indicating that polyamic acid has been generated.

[0062] Step S2: Treatment of polyamic acid solution

[0063] S2.1: Defoaming treatment: Conduct defoaming treatment on the polyamic acid solution obtained in step one to remove the bubbles in the solution.

[0064] Step S3, casting into a film

[0065] S3.1, solution spreading: The treated polyamic acid solution is evenly spread onto the metal belt through the casting nozzle of the casting equipment, and the running speed of the metal belt is 1 m / min;

[0066] S3.2, liquid film formation: During the running of the metal belt, a liquid film with a uniform thickness will be formed on its surface by the polyamic acid solution;

[0067] Step S4, drying and imidization

[0068] S4.1, drying treatment: The metal belt with the liquid film is sent into the drying oven and dried at 100 °C to evaporate part of the solvent, so that the liquid film forms a partially dried polyamic acid film, and the drying time is 8 min;

[0069] S4.2, imidization treatment: The partially dried polyamic acid film is sent into the imidization furnace and imidized at 300 °C. During the imidization process, the amide groups in the polyamic acid molecules will undergo a cyclization reaction to form a stable imide structure, and the imidization treatment time is 12 min;

[0070] Step S5, winding and post-treatment

[0071] S5.1, film peeling: The imidized polyimide film is peeled off from the metal belt;

[0072] S5.2, winding operation: The peeled polyimide film is wound by a winder, and the flatness and tension of the film are maintained during the winding process to avoid wrinkles and slack. The wound film can be cut, printed, coated and other subsequent processing steps according to needs;

[0073] Step S6, subsequent treatment

[0074] Quality inspection: The wound polyimide film is subjected to quality inspection, including tests on appearance, thickness, tensile strength, and insulation performance, to ensure that the quality of the film meets the predetermined standards and requirements.

[0075] In S1.1 of this embodiment, the dianhydride is pyromellitic dianhydride, and the diamine is one of 4,4'-diaminodiphenyl ether or 4,4'-diaminodiphenylmethane.

[0076] In S1.2 of this embodiment, the polar solvent is one of N,N-dimethylformamide or N-methylpyrrolidone.

[0077] In S1.2 of this embodiment, the catalyst is one of organic acids or inorganic acids, and the accelerator is one of organic amines or hydroxybenzoic acids.

[0078] In step S2.1 of this embodiment, vacuum defoaming method is adopted for defoaming treatment. The solution is placed in a vacuum container, and bubbles are removed by reducing pressure. The treatment time is 30 min until no bubbles emerge from the solution.

[0079] Example 2:

[0080] A method for efficiently preparing polyimide film materials includes the following steps:

[0081] Step S1, synthesize polyamic acid

[0082] S1.1, raw material preparation: Select high-quality dianhydride and diamine as raw materials, and weigh the raw materials according to a molar ratio of 1:1.

[0083] S1.2, solvent dissolution: Dissolve the weighed dianhydride and diamine in a polar solvent to completely dissolve the raw materials and form a uniform solution.

[0084] S1.3, add catalyst and accelerator: To improve the reaction rate and product quality, add appropriate amounts of catalyst and accelerator to the solution.

[0085] S1.4, heating and stirring: Place the container containing the raw material solution on a heating device, control the temperature at 200 °C, and turn on the stirring device to stir at a stirring speed of 500 r / min to ensure sufficient contact and uniform reaction between the reactants, so that polycondensation reaction occurs to generate polyamic acid solution. The reaction time is 8 h until the solution viscosity reaches a predetermined value, indicating that polyamic acid has been generated.

[0086] Step S2, treatment of polyamic acid solution

[0087] S2.1, defoaming treatment: Carry out defoaming treatment on the polyamic acid solution obtained in step one to remove the bubbles in the solution.

[0088] Step S3, casting into film

[0089] S3.1, solution spreading: Uniformly spread the treated polyamic acid solution onto the metal belt through the casting nozzle of the casting equipment, and the running speed of the metal belt is 5 m / min.

[0090] S3.2, liquid film formation: During the running of the metal belt, a liquid film with a uniform thickness will be formed on its surface by the polyamic acid solution.

[0091] Step S4, drying and imidization

[0092] S4.1, drying treatment: Send the metal belt with the liquid film into the drying oven to dry at 150 °C, evaporate a part of the solvent, and form a partially dried polyamic acid film from the liquid film. The drying time is 12 min.

[0093] S4.2, Imidization treatment: Send part of the dried polyamic acid film into the imidization furnace and carry out imidization treatment at 400 °C. During the imidization process, the amide groups in the polyamic acid molecules will undergo a cyclization reaction to form a stable imide structure. The imidization treatment time is 16 min;

[0094] Step S5, Rewinding and Post-treatment

[0095] S5.1, Film stripping: Peel the imidized polyimide film from the metal strip;

[0096] S5.2, Rewinding operation: Rewind the peeled polyimide film through a rewinder, and maintain the flatness and tension of the film during the rewinding process to avoid wrinkles and slack. The rewound film can be cut, printed, coated and other subsequent processing steps as needed;

[0097] Step S6, Post-treatment

[0098] Quality inspection: Conduct quality inspection on the rewound polyimide film, including tests on appearance, thickness, tensile strength, and insulation performance, to ensure that the quality of the film meets the predetermined standards and requirements.

[0099] In S1.1 of this embodiment, the dianhydride is pyromellitic dianhydride, and the diamine is one of 4,4'-diaminodiphenyl ether or 4,4'-diaminodiphenylmethane.

[0100] In S1.2 of this embodiment, the polar solvent is one of N,N-dimethylformamide or N-methylpyrrolidone.

[0101] In S1.2 of this embodiment, the catalyst is one of organic acids or inorganic acids, and the accelerator is one of organic amines or hydroxybenzoic acids.

[0102] In step S2.1 of this embodiment, the defoaming treatment adopts the vacuum defoaming method. Place the solution in a vacuum container and remove the bubbles by reducing the pressure. The treatment time is 60 min until no bubbles emerge from the solution.

[0103] Example 3:

[0104] A method for efficiently preparing a polyimide film material, comprising the following steps:

[0105] Step S1, Synthesize polyamic acid

[0106] S1.1, Raw material preparation: Select high-quality dianhydride and diamine as raw materials, and weigh the raw materials according to a molar ratio of 1:1;

[0107] S1.2, Solvent Dissolution: Dissolve the weighed dianhydride and diamine in a polar solvent to completely dissolve the raw materials and form a homogeneous solution;

[0108] S1.3, Adding Catalyst and Accelerator: To increase the reaction rate and the quality of the product, add an appropriate amount of catalyst and accelerator to the solution;

[0109] S1.4, Heating and Stirring: Place the container with the raw material solution on a heating device, control the temperature at 175 °C, and turn on the stirring device to stir at a speed of 350 r / min to ensure sufficient contact and uniform reaction between the reactants, causing a polycondensation reaction to occur to form a polyamic acid solution. The reaction time is 4 - 8 h until the solution viscosity reaches a predetermined value, indicating that the polyamic acid has been formed;

[0110] Step S2, Treatment of Polyamic Acid Solution

[0111] S2.1, Defoaming Treatment: Carry out defoaming treatment on the polyamic acid solution obtained in Step 1 to remove the bubbles in the solution;

[0112] Step S3, Casting into Film

[0113] S3.1, Solution Spreading: Uniformly spread the treated polyamic acid solution onto the metal belt through the casting nozzle of the casting equipment. The running speed of the metal belt is 3 m / min;

[0114] S3.2, Liquid Film Formation: During the running of the metal belt, a liquid film with a uniform thickness will form on its surface from the polyamic acid solution;

[0115] Step S4, Drying and Imidization

[0116] S4.1, Drying Treatment: Send the metal belt with the liquid film into the drying oven and dry it at 125 °C to evaporate part of the solvent, causing the liquid film to form a partially dried polyamic acid film. The drying time is 10 min;

[0117] S4.2, Imidization Treatment: Send the partially dried polyamic acid film into the imidization furnace and carry out imidization treatment at 350 °C. During the imidization process, the amide groups in the polyamic acid molecules will undergo a cyclization reaction to form a stable imide structure. The imidization treatment time is 14 min;

[0118] Step S5, Rewinding and Post - treatment

[0119] S5.1, Film Stripping: Peel the imidized polyimide film from the metal belt;

[0120] S5.2, Rewinding operation: The peeled polyimide film is rewound by a rewinder, and the flatness and tension of the film are maintained during the rewinding process to avoid wrinkles and slack. The rewound film can be cut, printed, coated, and subjected to other subsequent processing steps as needed;

[0121] Step S6, Subsequent processing

[0122] Quality inspection: The rewound polyimide film is subjected to quality inspection, including tests on appearance, thickness, tensile strength, and insulation performance, to ensure that the quality of the film meets the predetermined standards and requirements.

[0123] In S1.1 of this embodiment, the dianhydride is pyromellitic dianhydride, and the diamine is one of 4,4'-diaminodiphenyl ether or 4,4'-diaminodiphenylmethane.

[0124] In S1.2 of this embodiment, the polar solvent is one of N,N-dimethylformamide or N-methylpyrrolidone.

[0125] In S1.2 of this embodiment, the catalyst is one of organic acids or inorganic acids, and the accelerator is one of organic amines or hydroxybenzoic acids.

[0126] In step S2.1 of this embodiment, the defoaming treatment adopts the vacuum defoaming method. The solution is placed in a vacuum container, and the bubbles are removed by reducing the pressure. The treatment time is 45 minutes until no bubbles emerge from the solution.

[0127] Example 4:

[0128] A method for efficiently preparing a polyimide film material, comprising the following steps:

[0129] Step S1, Synthesizing polyamic acid

[0130] S1.1, Raw material preparation: Select high-quality dianhydride and diamine as raw materials, and the raw materials are weighed according to a molar ratio of 1:1;

[0131] S1.3, Adding catalyst and accelerator: To improve the reaction rate and the quality of the product, an appropriate amount of catalyst and accelerator are added to the solution;

[0132] S1.3, Adding catalyst and accelerator: To improve the reaction rate and the quality of the product, an appropriate amount of catalyst and accelerator are added to the solution;

[0133] S1.4. Heating and Stirring: Place the container filled with the raw material solution on the heating device, control the temperature at 160 °C, and turn on the stirring device to stir at a speed of 300 r / min to ensure sufficient contact and uniform reaction between the reactants, enabling a polycondensation reaction to occur to generate a polyamic acid solution. The reaction time is 4 - 8 h until the solution viscosity reaches a predetermined value, indicating the formation of polyamic acid.

[0134] Step S2. Treatment of the polyamic acid solution

[0135] S2.1. Defoaming Treatment: Conduct defoaming treatment on the polyamic acid solution obtained in Step 1 to remove the bubbles in the solution.

[0136] Step S3. Casting into a film

[0137] S3.1. Solution Spreading: Evenly spread the treated polyamic acid solution onto the metal belt through the casting nozzle of the casting equipment. The running speed of the metal belt is 2.5 m / min.

[0138] S3.2. Liquid Film Formation: During the running of the metal belt, a liquid film with a uniform thickness will form on its surface from the polyamic acid solution.

[0139] Step S4. Drying and Imidization

[0140] S4.1. Drying Treatment: Send the metal belt with the liquid film into the drying oven and dry it at 110 °C to evaporate part of the solvent, enabling the liquid film to form a partially dried polyamic acid film. The drying time is 9 min.

[0141] S4.2. Imidization Treatment: Send the partially dried polyamic acid film into the imidization furnace and conduct imidization treatment at 330 °C. During the imidization process, the amide groups in the polyamic acid molecules will undergo a cyclization reaction to form a stable imide structure. The imidization treatment time is 13 min.

[0142] Step S5. Rewinding and Post-treatment

[0143] S5.1. Film Stripping: Peel the imidized polyimide film from the metal belt.

[0144] S5.2. Rewinding Operation: Rewind the peeled polyimide film through a rewinder, and maintain the flatness and tension of the film during the rewinding process to avoid wrinkles and slack. The rewound film can be cut, printed, coated, and subjected to other subsequent processing steps as needed.

[0145] Step S6. Subsequent Treatment

[0146] Quality inspection: Conduct quality inspection on the wound polyimide film, including tests on appearance, thickness, tensile strength, and insulation performance, to ensure that the quality of the film meets the predetermined standards and requirements.

[0147] In S1.1 of this embodiment, the dianhydride is pyromellitic dianhydride, and the diamine is one of 4,4'-diaminodiphenyl ether or 4,4'-diaminodiphenylmethane.

[0148] In S1.2 of this embodiment, the polar solvent is one of N,N-dimethylformamide or N-methylpyrrolidone.

[0149] In S1.2 of this embodiment, the catalyst is one of organic acids or inorganic acids, and the accelerator is one of organic amines or hydroxybenzoic acids.

[0150] In step S2.1 of this embodiment, the defoaming treatment adopts the vacuum defoaming method. The solution is placed in a vacuum container, and the bubbles are removed by reducing the pressure. The treatment time is 35 minutes until no bubbles emerge from the solution.

[0151] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0152] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for efficiently preparing polyimide film materials, characterized in that, It includes the following steps: Step S1: Synthesize polyamic acid S1.1: Raw material preparation: Select high-quality dianhydride and diamine as raw materials, and weigh the raw materials according to a molar ratio of 1:1; S1.2: Solvent dissolution: Dissolve the weighed dianhydride and diamine in a polar solvent to completely dissolve the raw materials and form a homogeneous solution; S1.3: Add catalyst and accelerator: To improve the reaction rate and the quality of the product, add an appropriate amount of catalyst and accelerator to the solution; S1.4: Heat and stir: Place the container containing the raw material solution on a heating device, control the temperature at 150 - 200 °C, and turn on the stirring device to stir at a stirring speed of 200 - 500 r / min to ensure sufficient contact and uniform reaction between the reactants, so that a polycondensation reaction occurs to generate a polyamic acid solution. The reaction time is 4 - 8 h until the solution viscosity reaches a predetermined value, indicating that polyamic acid has been generated; Step S2: Treatment of polyamic acid solution S2.1: Defoaming treatment: Carry out defoaming treatment on the polyamic acid solution obtained in step one to remove the bubbles in the solution; Step S3: Casting into film S3.1: Solution spreading: Uniformly spread the treated polyamic acid solution onto the metal belt through the casting nozzle of the casting equipment, and the running speed of the metal belt is 1 - 5 m / min; S3.2: Formation of liquid film: During the running of the metal belt, a liquid film with a uniform thickness will be formed on its surface by the polyamic acid solution; Step S4: Drying and imidization S4.1: Drying treatment: Send the metal belt with the liquid film into the drying oven and dry it at 100 - 150 °C to evaporate part of the solvent, so that the liquid film forms a partially dried polyamic acid film. The drying time is 8 - 12 min; S4.2: Imidization treatment: Send the partially dried polyamic acid film into the imidization furnace and carry out imidization treatment at 300 - 400 °C. During the imidization process, the amide groups in the polyamic acid molecules will undergo a cyclization reaction to form a stable imide structure. The imidization treatment time is 12 - 16 min; Step S5: Rewinding and post-treatment S5.1: Film peeling: Peel the imidized polyimide film from the metal belt; S5.2: Rewinding operation: Rewind the peeled polyimide film through a rewinder, and maintain the flatness and tension of the film during the rewinding process to avoid wrinkles and slack. The rewound film can be cut, printed, coated and other subsequent processing steps according to needs; Step S6: Post-treatment Quality inspection: Conduct quality inspection on the rewound polyimide film, including tests on appearance, thickness, tensile strength, insulation performance, etc., to ensure that the quality of the film meets the predetermined standards and requirements.

2. The method for efficiently preparing a polyimide film material according to claim 1, characterized in that In S1.1, the dianhydride is pyromellitic dianhydride, and the diamine is one of 4,4'-diaminodiphenyl ether or 4,4'-diaminodiphenylmethane.

3. A method for efficiently preparing a polyimide film material according to claim 1, characterized in that, In S1.2, the polar solvent is one of N,N-dimethylformamide or N-methylpyrrolidone.

4. A method for efficiently preparing a polyimide film material according to claim 1, characterized in that, In S1.2, the catalyst is one of organic acids or inorganic acids, and the accelerator is one of organic amines or hydroxybenzoic acids.

5. A method for efficiently preparing a polyimide film material according to claim 1, characterized in that, Step S2.1, the defoaming treatment adopts the vacuum defoaming method. The solution is placed in a vacuum container, and the bubbles are removed by reducing the pressure. The treatment time is 30 - 60 minutes until no bubbles emerge from the solution.