Polyperfluorinated ethylene propylene emulsion as well as preparation method and application thereof

Abstract

The invention discloses a modified fluorinated ethylene-propylene emulsion as well as a preparation method and application thereof. Comprising the following components in parts by weight: 80-160 parts of fluorinated ethylene propylene emulsion, 5-15 parts of inorganic filler, 0.1-1.5 parts of an initiator and 5-15 parts of a flame retardant. A polyimide film prepared by coating fluorine with the modified fluorinated ethylene-propylene emulsion is good in wear resistance, mechanical property and flame retardant property. The basic magnesium sulfate whisker and the zirconium diboride whisker in the components are combined for use, so that the wear resistance of the material is improved; ammonium persulfate and dibenzoyl peroxide are combined for use, so that the mechanical property of the material is improved; the tridecafluorooctyl propyl polyhedral oligomeric silsesquioxane and the resorcinol bis (diphenyl phosphate) are combined for use, so that the flame retardance of the material is improved, and synergistic interaction is achieved.

Description

Technical Field

[0001] This invention belongs to the field of polyimide film processing technology, specifically relating to a perfluoroethylene propylene emulsion and its preparation method and application. Background Technology

[0002] Polyimide films, with their irreplaceable high-temperature resistance and comprehensive mechanical and electrical properties, have become key strategic materials in cutting-edge fields such as aerospace, microelectronics, and new energy. With technological advancements, their high-performance, functionalization, and expanded applications in emerging fields such as flexible electronics will be the core directions for the future. Fluorinated polyethylene propylene (FEP) emulsion coating technology has attracted attention in high-end anti-corrosion, waterproof, and oil-resistant coating fields due to its excellent chemical inertness, weather resistance, and low surface energy. However, this technology faces a series of inherent physicochemical defects and environmental challenges in practical applications, restricting its performance and widespread adoption.

[0003] Coating fluorinated polyimide (FEP) films with perfluoroethylene propylene (PTFE) emulsions can improve film performance, but some drawbacks remain. The low surface energy of fluoropolymers results in weak intermolecular forces, making the coating more susceptible to wear and peeling during abrasion. When the material undergoes bending or tensile deformation, the mismatch in modulus and coefficient of thermal expansion between PI and FEP generates shear stress. The weak interface cannot effectively transfer and disperse this stress, leading to coating wrinkling, cracking, or overall delamination failure. While FEP, as a perfluoropolymer, possesses high flame retardancy and does not burn upon contact with fire, its flame retardancy is primarily achieved through endothermic decomposition and the release of small amounts of non-toxic gases. However, when the temperature exceeds the decomposition point (approximately 260°C for FEP), the flame retardant barrier rapidly fails, posing a safety hazard in electronic components requiring high flame retardancy. Summary of the Invention

[0004] The purpose of this invention is to provide a poly(fluoroethylene propylene) emulsion, its preparation method, and its application.

[0005] A modified poly(fluoroethylene propylene) emulsion comprises the following components in parts by weight: 80-160 parts of poly(fluoroethylene propylene) emulsion, 5-15 parts of inorganic filler, 0.1-1.5 parts of initiator, and 5-15 parts of flame retardant.

[0006] The inorganic filler is a mixture of basic magnesium sulfate whiskers and zirconium diboride whiskers in a mass ratio of 3:1.

[0007] The initiator is a mixture of ammonium persulfate and benzoyl peroxide in a mass ratio of 1:1.

[0008] The flame retardant is a mixture of tridecafluorooctylpropyl cage-type silsesquioxane and resorcinol bis(diphenyl phosphate) in a mass ratio of 1:3.

[0009] The modified poly(perfluoroethylene propylene) emulsion is prepared according to the following steps: 80-160 parts by weight of poly(perfluoroethylene propylene) emulsion, 5-15 parts of inorganic filler, 0.1-1.5 parts of initiator, and 5-15 parts of flame retardant are mixed, magnetically stirred for 10-30 minutes, and ultrasonically dispersed for 10-20 minutes.

[0010] The application of the modified perfluoroethylene propylene emulsion in the fluorination process of polyimide films.

[0011] The specific steps for the fluorine coating process are as follows: (1) Pass the polyimide film through a dip coating tank containing modified perfluoroethylene propylene emulsion at a linear speed of 1.5-4.5 m / min; (2) The film coated in step (1) is placed in a vertical drying oven for heating and drying; (3) The film dried in step (2) is placed in a horizontal oven for high-temperature sintering; (4) After static electricity elimination and winding, the film is cut into thin films.

[0012] In step (2), the temperature of the lower section of the oven is set to 120-130℃ and the temperature of the upper section is set to 140-160℃.

[0013] In step (3), the temperature of the front section of the oven is set to 250-270℃ and the temperature of the rear section is set to 350-360℃.

[0014] The beneficial effects of this invention are as follows: The polyimide film prepared by the modified poly(perfluoroethylene propylene) emulsion fluorination process of this invention exhibits good wear resistance, mechanical properties, and flame retardancy. The combination of basic magnesium sulfate whiskers and zirconium diboride whiskers improves the wear resistance of the material; the combination of ammonium persulfate and benzoyl peroxide improves the mechanical properties of the material; and the combination of tridecafluorooctylpropyl cage-type silsesquioxane and resorcinol bis(diphenyl phosphate) improves the flame retardancy of the material, with synergistic effects. Detailed Implementation

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Example 1 A modified poly(perfluoroethylene propylene) emulsion comprises the following components in parts by weight: 120 parts of poly(perfluoroethylene propylene) emulsion, 10 parts of inorganic filler, 0.2 parts of initiator, and 10 parts of flame retardant; wherein the inorganic filler is a mixture of basic magnesium sulfate whiskers and zirconium diboride whiskers in a mass ratio of 3:1; the initiator is a mixture of ammonium persulfate and benzoyl peroxide in a mass ratio of 1:1; and the flame retardant is a mixture of tridecafluorooctylpropyl cage-type silsesquioxane (prepared according to the method disclosed in Example 1 of patent CN 101857607A) and resorcinol bis(diphenyl phosphate) in a mass ratio of 1:3.

[0017] The modified poly(perfluoroethylene propylene) emulsion is prepared according to the following steps: 120 parts by weight of poly(perfluoroethylene propylene) emulsion, 10 parts by weight of inorganic filler, 0.2 parts by weight of initiator and 10 parts by weight of flame retardant are mixed, magnetically stirred for 20 minutes, and ultrasonically dispersed for 15 minutes.

[0018] The specific steps for fluorination processing of polyimide films using modified perfluoroethylene propylene emulsion are as follows: (1) Pass the polyimide film through a dip coating tank containing a modified perfluoroethylene propylene emulsion at a linear speed of 3 m / min; (2) The film coated in step (1) is placed in a vertical oven for heating and drying; the temperature of the lower section of the oven is set to 125°C and the temperature of the upper section is set to 150°C. (3) The film dried in step (2) is placed in a horizontal oven for high-temperature sintering; the temperature of the front section of the oven is set to 260°C and the temperature of the rear section is set to 355°C. (4) After static electricity elimination and winding, the film is cut into thin films.

[0019] Example 2 A modified poly(perfluoroethylene propylene) emulsion comprises the following components in parts by weight: 90 parts of poly(perfluoroethylene propylene) emulsion, 6 parts of inorganic filler, 0.1 parts of initiator, and 6 parts of flame retardant; wherein the inorganic filler is a mixture of basic magnesium sulfate whiskers and zirconium diboride whiskers in a mass ratio of 3:1; the initiator is a mixture of ammonium persulfate and benzoyl peroxide in a mass ratio of 1:1; and the flame retardant is a mixture of tridecafluorooctylpropyl cage-type silsesquioxane (prepared according to the method disclosed in Example 1 of patent CN 101857607 A) and resorcinol bis(diphenyl phosphate) in a mass ratio of 1:3.

[0020] The modified poly(perfluoroethylene propylene) emulsion is prepared according to the following steps: 90 parts by weight of poly(perfluoroethylene propylene) emulsion, 6 parts of inorganic filler, 0.1 parts of initiator, and 6 parts of flame retardant are mixed, magnetically stirred for 15 minutes, and ultrasonically dispersed for 12 minutes.

[0021] The specific steps for fluorination processing of polyimide films using modified perfluoroethylene propylene emulsion are as follows: (1) Pass the polyimide film through a dip coating tank containing a modified perfluoroethylene propylene emulsion at a linear speed of 2 m / min; (2) The film coated in step (1) is placed in a vertical oven for heating and drying; the temperature of the lower section of the oven is set to 120°C and the temperature of the upper section is set to 140°C. (3) The film dried in step (2) is placed in a horizontal oven for high-temperature sintering; the temperature of the front section of the oven is set to 250°C and the temperature of the rear section is set to 350°C. (4) After static electricity elimination and winding, the film is cut into thin films.

[0022] Example 3 A modified poly(perfluoroethylene propylene) emulsion comprises the following components in parts by weight: 150 parts of poly(perfluoroethylene propylene) emulsion, 12 parts of inorganic filler, 0.6 parts of initiator, and 12 parts of flame retardant; wherein the inorganic filler is a mixture of basic magnesium sulfate whiskers and zirconium diboride whiskers in a mass ratio of 3:1; the initiator is a mixture of ammonium persulfate and benzoyl peroxide in a mass ratio of 1:1; and the flame retardant is a mixture of tridecafluorooctylpropyl cage-type silsesquioxane (prepared according to the method disclosed in Example 1 of patent CN 101857607A) and resorcinol bis(diphenyl phosphate) in a mass ratio of 1:3.

[0023] The modified poly(perfluoroethylene propylene) emulsion is prepared according to the following steps: 150 parts by weight of poly(perfluoroethylene propylene) emulsion, 12 parts by weight of inorganic filler, 0.6 parts by weight of initiator and 12 parts by weight of flame retardant are mixed, magnetically stirred for 25 minutes, and ultrasonically dispersed for 18 minutes.

[0024] The specific steps for processing the modified perfluoroethylene propylene emulsion into a polyimide film using fluorination are as follows: (1) Pass the polyimide film through a dip coating tank containing a modified perfluoroethylene propylene emulsion at a linear speed of 4 m / min; (2) The film coated in step (1) is placed in a vertical oven for heating and drying; the temperature of the lower section of the oven is set to 130°C and the temperature of the upper section is set to 160°C. (3) The film dried in step (2) is placed in a horizontal oven for high-temperature sintering; the temperature of the front section of the oven is set to 270°C and the temperature of the rear section is set to 360°C. (4) After static electricity elimination and winding, the film is cut into thin films.

[0025] Comparative Example 1 A modified poly(perfluoroethylene propylene) emulsion comprises the following components in parts by weight: 120 parts of poly(perfluoroethylene propylene) emulsion, 10 parts of basic magnesium sulfate whiskers, 0.2 parts of initiator, and 10 parts of flame retardant; wherein the initiator is a mixture of ammonium persulfate and benzoyl peroxide in a mass ratio of 1:1; and the flame retardant is a mixture of tridecafluorooctylpropyl cage-type silsesquioxane (prepared according to the method disclosed in Example 1 of Patent CN 101857607 A) and resorcinol bis(diphenyl phosphate) in a mass ratio of 1:3.

[0026] The modified poly(perfluoroethylene propylene) emulsion is prepared according to the following steps: 120 parts by weight of poly(perfluoroethylene propylene) emulsion, 10 parts by weight of basic magnesium sulfate whiskers, 0.2 parts by weight of initiator and 10 parts by weight of flame retardant are mixed, magnetically stirred for 20 minutes, and ultrasonically dispersed for 15 minutes.

[0027] The specific steps for fluorination processing of polyimide films using modified perfluoroethylene propylene emulsion are as follows: (1) Pass the polyimide film through a dip coating tank containing a modified perfluoroethylene propylene emulsion at a linear speed of 3 m / min; (2) The film coated in step (1) is placed in a vertical oven for heating and drying; the temperature of the lower section of the oven is set to 125°C and the temperature of the upper section is set to 150°C. (3) The film dried in step (2) is placed in a horizontal oven for high-temperature sintering; the temperature of the front section of the oven is set to 260°C and the temperature of the rear section is set to 355°C. (4) After static electricity elimination and winding, the film is cut into thin films.

[0028] Comparative Example 2 A modified poly(perfluoroethylene propylene) emulsion comprises the following components in parts by weight: 120 parts of poly(perfluoroethylene propylene) emulsion, 10 parts of zirconium diboride whiskers, 0.2 parts of initiator, and 10 parts of flame retardant; wherein the initiator is a mixture of ammonium persulfate and benzoyl peroxide in a mass ratio of 1:1; and the flame retardant is a mixture of tridecafluorooctylpropyl cage-type silsesquioxane (prepared according to the method disclosed in Example 1 of Patent CN 101857607 A) and resorcinol bis(diphenyl phosphate) in a mass ratio of 1:3.

[0029] The modified poly(perfluoroethylene propylene) emulsion is prepared according to the following steps: 120 parts by weight of poly(perfluoroethylene propylene) emulsion, 10 parts by weight of zirconium diboride whiskers, 0.2 parts by weight of initiator and 10 parts by weight of flame retardant are mixed, magnetically stirred for 20 minutes, and ultrasonically dispersed for 15 minutes.

[0030] The specific steps for fluorination processing of polyimide films using modified perfluoroethylene propylene emulsion are as follows: (1) Pass the polyimide film through a dip coating tank containing a modified perfluoroethylene propylene emulsion at a linear speed of 3 m / min; (2) The film coated in step (1) is placed in a vertical oven for heating and drying; the temperature of the lower section of the oven is set to 125°C and the temperature of the upper section is set to 150°C. (3) The film dried in step (2) is placed in a horizontal oven for high-temperature sintering; the temperature of the front section of the oven is set to 260°C and the temperature of the rear section is set to 355°C. (4) After static electricity elimination and winding, the film is cut into thin films.

[0031] Comparative Example 3 A modified poly(perfluoroethylene propylene) emulsion comprises the following components in parts by weight: 120 parts of poly(perfluoroethylene propylene) emulsion, 10 parts of inorganic filler, 0.2 parts of ammonium persulfate, and 10 parts of flame retardant; wherein the inorganic filler is a mixture of basic magnesium sulfate whiskers and zirconium diboride whiskers in a mass ratio of 3:1; and the flame retardant is a mixture of tridecafluorooctylpropyl cage-type silsesquioxane (prepared according to the method disclosed in Example 1 of patent CN 101857607 A) and resorcinol bis(diphenyl phosphate) in a mass ratio of 1:3.

[0032] The modified poly(perfluoroethylene propylene) emulsion is prepared according to the following steps: 120 parts by weight of poly(perfluoroethylene propylene) emulsion, 10 parts of inorganic filler, 0.2 parts of ammonium persulfate, and 10 parts of flame retardant are mixed, magnetically stirred for 20 minutes, and ultrasonically dispersed for 15 minutes.

[0033] The specific steps for fluorination processing of polyimide films using modified perfluoroethylene propylene emulsion are as follows: (1) Pass the polyimide film through a dip coating tank containing a modified perfluoroethylene propylene emulsion at a linear speed of 3 m / min; (2) The film coated in step (1) is placed in a vertical oven for heating and drying; the temperature of the lower section of the oven is set to 125°C and the temperature of the upper section is set to 150°C. (3) The film dried in step (2) is placed in a horizontal oven for high-temperature sintering; the temperature of the front section of the oven is set to 260°C and the temperature of the rear section is set to 355°C. (4) After static electricity elimination and winding, the film is cut into thin films.

[0034] Comparative Example 4 A modified poly(perfluoroethylene propylene) emulsion comprises the following components in parts by weight: 120 parts of poly(perfluoroethylene propylene) emulsion, 10 parts of inorganic filler, 0.2 parts of benzoyl peroxide, and 10 parts of flame retardant; wherein the inorganic filler is a mixture of basic magnesium sulfate whiskers and zirconium diboride whiskers in a mass ratio of 3:1; and the flame retardant is a mixture of tridecafluorooctylpropyl cage-type silsesquioxane (prepared according to the method disclosed in Example 1 of Patent CN 101857607 A) and resorcinol bis(diphenyl phosphate) in a mass ratio of 1:3.

[0035] The modified poly(perfluoroethylene propylene) emulsion is prepared according to the following steps: 120 parts by weight of poly(perfluoroethylene propylene) emulsion, 10 parts of inorganic filler, 0.2 parts of benzoyl peroxide, and 10 parts of flame retardant are mixed, magnetically stirred for 20 minutes, and ultrasonically dispersed for 15 minutes.

[0036] The specific steps for fluorination processing of polyimide films using modified perfluoroethylene propylene emulsion are as follows: (1) Pass the polyimide film through a dip coating tank containing a modified perfluoroethylene propylene emulsion at a linear speed of 3 m / min; (2) The film coated in step (1) is placed in a vertical oven for heating and drying; the temperature of the lower section of the oven is set to 125°C and the temperature of the upper section is set to 150°C. (3) The film dried in step (2) is placed in a horizontal oven for high-temperature sintering; the temperature of the front section of the oven is set to 260°C and the temperature of the rear section is set to 355°C. (4) After static electricity elimination and winding, the film is cut into thin films.

[0037] Comparative Example 5 A modified perfluoroethylene propylene emulsion comprises the following components in parts by weight: 120 parts of perfluoroethylene propylene emulsion, 10 parts of inorganic filler, 0.2 parts of initiator, and 10 parts of tridecafluorooctylpropyl cage-type silsesquioxane; wherein the inorganic filler is a mixture of basic magnesium sulfate whiskers and zirconium diboride whiskers in a mass ratio of 3:1; and the initiator is a mixture of ammonium persulfate and benzoyl peroxide in a mass ratio of 1:1.

[0038] The modified poly(perfluoroethylene propylene) emulsion is prepared according to the following steps: 120 parts by weight of poly(perfluoroethylene propylene) emulsion, 10 parts of inorganic filler, 0.2 parts of initiator, and 10 parts of tridecafluorooctylpropyl cage-type silsesquioxane are mixed, magnetically stirred for 20 minutes, and ultrasonically dispersed for 15 minutes.

[0039] The specific steps for fluorination processing of polyimide films using modified perfluoroethylene propylene emulsion are as follows: (1) Pass the polyimide film through a dip coating tank containing a modified perfluoroethylene propylene emulsion at a linear speed of 3 m / min; (2) The film coated in step (1) is placed in a vertical oven for heating and drying; the temperature of the lower section of the oven is set to 125°C and the temperature of the upper section is set to 150°C. (3) The film dried in step (2) is placed in a horizontal oven for high-temperature sintering; the temperature of the front section of the oven is set to 260°C and the temperature of the rear section is set to 355°C. (4) After static electricity elimination and winding, the film is cut into thin films.

[0040] Comparative Example 6 A modified poly(perfluoroethylene propylene) emulsion comprises the following components in parts by weight: 120 parts of poly(perfluoroethylene propylene) emulsion, 10 parts of inorganic filler, 0.2 parts of initiator, and 10 parts of resorcinol bis(diphenyl phosphate); wherein the inorganic filler is a mixture of basic magnesium sulfate whiskers and zirconium diboride whiskers in a mass ratio of 3:1; and the initiator is a mixture of ammonium persulfate and benzoyl peroxide in a mass ratio of 1:1.

[0041] The modified poly(perfluoroethylene propylene) emulsion is prepared according to the following steps: 120 parts by weight of poly(perfluoroethylene propylene) emulsion, 10 parts of inorganic filler, 0.2 parts of initiator, and 10 parts of resorcinol bis(diphenyl phosphate) are mixed, magnetically stirred for 20 min, and ultrasonically dispersed for 15 min.

[0042] The specific steps for fluorination processing of polyimide films using modified perfluoroethylene propylene emulsion are as follows: (1) Pass the polyimide film through a dip coating tank containing a modified perfluoroethylene propylene emulsion at a linear speed of 3 m / min; (2) The film coated in step (1) is placed in a vertical oven for heating and drying; the temperature of the lower section of the oven is set to 125°C and the temperature of the upper section is set to 150°C. (3) The film dried in step (2) is placed in a horizontal oven for high-temperature sintering; the temperature of the front section of the oven is set to 260°C and the temperature of the rear section is set to 355°C. (4) After static electricity elimination and winding, the film is cut into thin films.

[0043] Experimental example: The wear rate (×10) of the fluorinated polyimide films prepared in Examples 1-3 and Comparative Examples 1-2 was measured. -4 mm 3 / Nm): The wear resistance of polyimide films was tested using an MS-T3001 friction testing machine. The wear test conditions were set as follows: rotation speed 300 r / min, load 5 N, test duration 30 min, and rotation radius 3 mm. The steel balls used for friction were made of GCr15 bearing steel with a diameter of 4 mm. The width and depth of the wear marks on the film surface were measured using a Zeiss Observer Z1m metallographic microscope, and the wear rate was calculated. Statistical analysis was performed on the experimental results. Measurement data are expressed as mean ± (mean ± standard deviation) x. The Kolmogorov-Smirnov test was used to test the normality of the data. For normally distributed data, the t-test was used to compare the differences in means between two groups, with P < 0.05 considered statistically significant. The measurement results are shown in Table 1: Table 1

[0044] Note: * indicates that compared with Example 1 group, P<0.05.

[0045] According to GB / T13022-1991, the fluorinated polyimide films of Examples 1-3 and Comparative Examples 3-4 were prepared into standard specimens of 20mm × 100mm, and their tensile strength was tested on an electronic universal testing machine. The specimens were then subjected to atmospheric pressure treatment at 200℃ and 32% oxygen concentration for 72 hours. The tensile strength of the standard specimens was then tested on the electronic universal testing machine, and the rate of change in tensile strength before and after the thermo-oxidative aging treatment was calculated. The results are shown in Table 2. Table 2

[0046] Note: * indicates that compared with Example 1 group, P<0.05.

[0047] Standard samples were prepared from the fluorinated polyimide films of Examples 1-3 and Comparative Examples 5-6 according to GB / T2406.2-2009, and the limiting oxygen index of the standard samples was tested. The results are shown in Table 3. Table 3

[0048] Note: * indicates that compared with Example 1 group, P<0.05.

[0049] The above embodiments are merely illustrative examples of preferred embodiments of the present invention and do not encompass all possible implementations. Any modifications and refinements made by those skilled in the art without departing from the spirit and scope of the present invention are considered to fall within the protection scope of the claims.

Claims

1. A modified polyfluoroethylene propylene emulsion, characterized in that, The components include the following components by weight: polyfluoroethylene propylene emulsion 80-160 parts, inorganic filler 5-15 parts, initiator 0.1-1.5 parts, flame retardant 5-15 parts.

2. The modified polyfluoroethylene propylene emulsion of claim 1, wherein, The inorganic filler is a mixture of basic magnesium sulfate whiskers and zirconium diboride whiskers in a mass ratio of 3:

1.

3. The modified polyfluoroethylene propylene emulsion of claim 1, wherein, The initiator is a mixture of ammonium persulfate and dibenzoyl peroxide in a mass ratio of 1:

1.

4. The modified polyfluoroethylene propylene emulsion of claim 1, wherein the emulsion has a pH of 2.5 to 4.

5. The flame retardant is a mixture of tridecafluorooctylpropyl cage silsesquioxane and resorcinol bis(diphenyl phosphate) in a mass ratio of 1:

3.

5. The method of claim 1, wherein the modified polyfluoroethylene propylene emulsion is prepared by the steps of: The following steps are taken: polyfluoroethylene propylene emulsion 80-160 parts, inorganic filler 5-15 parts, initiator 0.1-1.5 parts, and flame retardant 5-15 parts are mixed by weight, magnetically stirred for 10-30 min, and ultrasonically dispersed for 10-20 min.

6. The use of the modified polyfluoroethylene propylene emulsion of claim 1 in fluorine coating processing of polyimide film.

7. The use of the modified polyfluoroethylene-propylene emulsion according to claim 6 in the fluorine coating process of polyimide films, characterized in that, The specific operation steps of the fluorine coating processing are: (1) passing the polyimide film at a linear speed of 1.5-4.5 meters / minute through the immersion coating tank containing the modified polyfluoroethylene propylene emulsion; (2) the film after step (1) is coated is passed into a vertical oven for temperature rising and drying; (3) the dried film after step (2) is passed into a horizontal oven for high temperature sintering; (4) after static elimination and winding, the film is slit into a film.

8. The use of the modified polyfluoroethylene-propylene emulsion according to claim 7 in the fluorine coating process of polyimide films, characterized in that, The lower section of the oven in step (2) is set to a temperature of 120-130℃, and the upper section is set to a temperature of 140-160℃.

9. The use of the modified polyfluoroethylene-propylene emulsion according to claim 7 in the fluorine coating process of polyimide film, characterized in that, The front section of the oven in step (3) is set to a temperature of 250-270℃, and the rear section is set to a temperature of 350-360℃.

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