Imine film and preparation method thereof

Abstract

The invention discloses an imine film and a preparation method thereof, and relates to the technical field of imine films, the imine film comprises a winding roller and an imine film body, the imine film body is wound and connected to the middle of the winding roller, the imine film body comprises a base material layer, protective layers are laid on the front and back faces of the base material layer respectively, and each protective layer comprises a wear-resistant layer. The bottom of the wear-resistant layer is bonded with an anti-wrinkle layer, one side, far away from the wear-resistant layer, of the anti-wrinkle layer is further bonded with a tough layer, the base material layer comprises a film base body, protective layers are laid on the front face and the back face of the base material layer respectively, the two protective layers are composed of the wear-resistant layer, the anti-wrinkle layer and the tough layer respectively, and the wear-resistant layer, the anti-wrinkle layer and the tough layer are used in cooperation. According to the present invention, the wear resistance and the flexibility of the front surface and the back surface of the base material layer can be effectively improved, the wear condition of the front surface and the back surface of the base material layer can be effectively prevented, and the problem that the imine film wrinkles and even fractures under certain extreme conditions such as the imine film during the repeated bending and winding operation is solved.

Description

Technical Field

[0001] The invention relates to the technical field of imide films, in particular to an imide film and a preparation method thereof. Background Art

[0002] Imine film is a thin film material made from imine compounds. Imine compounds have high thermal and chemical stability, so imine films are widely used in various fields. The key to the preparation of imine films is to convert the imine solution into a uniform, continuous and stable film structure through the process of solution coating and heat treatment. Imine films are used in electronic devices, membrane separation, sensors and other fields, and have important application value.

[0003] At present, the existing imide film has many advantages such as high and low temperature resistance, low density, non-toxicity, smoke-free, convenient and safe construction, good sound absorption performance, etc. It is an excellent choice for heat insulation and sound absorption materials in the fields of ships, aerospace, high-speed trains, etc. However, imide film has some shortcomings under certain extreme conditions. When the imide film is repeatedly bent and wound, the single system imide film will have wrinkles or even breakage.

[0004] Based on this, the present invention designs an imide film and a preparation method thereof to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide an imide film and a preparation method thereof to solve the above-mentioned problems.

[0006] To achieve the above object, the present invention provides the following technical solution: an imide film, comprising a winding drum and an imide film body, the imide film body being wound and connected to the middle of the winding drum, the imide film body comprising a substrate layer, and protective layers are laid on both sides of the substrate layer;

[0007] The protective layer comprises a wear-resistant layer, an anti-wrinkle layer is bonded to the bottom of the wear-resistant layer, and a toughness layer is bonded to the side of the anti-wrinkle layer away from the wear-resistant layer;

[0008] The substrate layer comprises a film substrate, and insulating layers are respectively bonded to the front and back sides of the film substrate, and air-permeable layers are also bonded to the outer sides of the two groups of insulating layers.

[0009] Based on the above technical features, the present invention provides protective layers laid on both sides of the substrate layer, wherein the two sets of protective layers are respectively composed of a wear-resistant layer, an anti-wrinkle layer and a toughness layer. The wear-resistant layer, the anti-wrinkle layer and the toughness layer are used in combination to effectively improve the wear resistance and flexibility of both sides of the substrate layer, and effectively prevent the front and back sides of the substrate layer from being worn, thereby solving the problem of wrinkles or even breaks of the imide film under certain extreme conditions, such as repeated bending and winding operations.

[0010] This solution can enhance the insulation ability and corrosion resistance of the imide film body by bonding the insulating layer on the front and back sides of the film substrate respectively, and can effectively improve the service life of the imide film body. By bonding the breathable layer on the outside of the insulating layer, the permeability between the film substrate and the protective layer added on the front and back sides can be improved, so as to dissipate the heat inside the imide film body.

[0011] Preferably, in the above-mentioned imide film, the outer surface of the wear-resistant layer is sprayed with a wear-resistant coating, and the wear-resistant coating is a metal nitride coating.

[0012] Based on the above technical features, this solution sprays a wear-resistant coating on the outer surface of the wear-resistant layer, and the wear-resistant coating is a metal nitride coating. The application of the metal nitride coating in the imide film helps to improve the performance and function of the film, increase its wear resistance, chemical stability, thermal insulation, hardness and barrier properties, which enables the imide film to play a role in a wider range of applications.

[0013] Preferably, in the above-mentioned imide film, the wear-resistant layer is made of silicon carbide material.

[0014] Based on the above technical features, the wear-resistant layer in this solution is made of silicon carbide material. By applying the silicon carbide wear-resistant layer on the imide film, the wear resistance and service life of the imide film can be greatly enhanced, so that it can be used in more harsh environments, such as automotive parts, tool coatings, aerospace fields, etc.

[0015] Preferably, in the above-mentioned imide film, the anti-wrinkle layer is a polyethylene film.

[0016] Based on the above technical features, the anti-wrinkle layer in this solution is a polyethylene film. By applying the polyethylene film to the imide film, its flexibility, electrical insulation, transparency, moisture resistance and recyclability can be fully utilized to meet the needs of different fields, such as packaging, agricultural covering, electronics and electrical, etc.

[0017] Preferably, in the above-mentioned imide film, the toughness layer is a glass fiber mesh cloth.

[0018] Based on the above technical features, the toughness layer in this solution is a glass fiber mesh cloth. By using the glass fiber mesh cloth, the strength, stiffness, tear resistance and wrinkle resistance of the imide film can be significantly improved, while the heat resistance and dimensional stability can be increased, which enables the imide film to play a role in a wider range of application fields, such as building insulation materials, aerospace fields, electronic device packaging, etc.

[0019] Preferably, in the above-mentioned imide film, the insulating layer is made of polyvinylidene fluoride.

[0020] Based on the above technical features, the insulating layer in this solution is made of polyvinylidene fluoride. By applying divinylidene fluoride in the imide film, its chemical stability, high temperature stability, electrical insulation, weather resistance and biocompatibility can be fully utilized, which enables the imide film to play a role in a wider range of fields, such as electronic device packaging, medical field, chemical applications, etc.

[0021] Preferably, in the above-mentioned imide film, the breathable layer is a coated high-barrier film.

[0022] Based on the above technical features, the breathable layer in this solution is a coated high-barrier film. By applying the coated high-barrier film in the imide film, it can provide excellent barrier properties, protective properties and durability, and maintain the quality and stability of the packaged items. This enables the imide film to be widely used in food packaging, pharmaceutical packaging, electronic device packaging and other fields.

[0023] Another technical solution proposed by the present invention is a method for preparing an imide film, comprising the following steps:

[0024] S101: First, select an appropriate imide compound, such as polyimide, add it to a suitable solvent (such as N, N-dimethylacetamide), and fully dissolve it by stirring to ensure that the solution concentration and viscosity are suitable for the required film thickness and application requirements.

[0025] S102: Next, the target substrate material such as a glass sheet or a silicon sheet is placed on a flat surface, and the imide solution is evenly coated on the substrate surface using a coating tool such as a scraper or a roller coater. The uniformity and appropriate thickness of the film can be controlled by adjusting the coating speed and pressure.

[0026] S103: Then, the coated substrate material is placed in an environment of room temperature or slightly higher temperature to allow the solvent to evaporate slowly. This step can be accelerated by placing it on a flat plate or using slight heating in an oven. During the evaporation process, the imide solution gradually forms an imide film.

[0027] S104: Finally, the volatilized sample is placed on a hot plate or in an oven for heat treatment. According to the characteristics of the imide material used and the application requirements, the appropriate temperature and duration are selected. The heat treatment helps the cross-linking and curing of the imide film, and enhances its stability and mechanical properties.

[0028] S105: After the heat treatment is completed, the sample is cooled to room temperature to completely solidify the imide film. This can be achieved by natural cooling or using auxiliary means such as a cooling table. The cured imide film has the desired stability and structural properties and can be used in various applications.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The structural design of the imide film is novel. When in use, the protective layers are laid on the front and back sides of the substrate layer. The two sets of protective layers are respectively composed of a wear-resistant layer, an anti-wrinkle layer and a toughness layer. The wear-resistant layer, the anti-wrinkle layer and the toughness layer are used together to effectively improve the wear resistance and flexibility of the front and back sides of the substrate layer, and can effectively prevent the front and back sides of the substrate layer from being worn, thus solving the problem of wrinkles or even breaks of the imide film under certain extreme conditions, such as repeated bending and winding operations;

[0031] 2. This solution can enhance the insulation ability and corrosion resistance of the imide film body by bonding the insulating layer on the front and back sides of the film substrate, and can effectively improve the service life of the imide film body. By bonding the breathable layer on the outside of the insulating layer, the permeability between the film substrate and the protective layer added on the front and back sides can be improved, so as to dissipate the heat inside the imide film body. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0035] Figure 3 It is a schematic diagram of the decomposition of the protective layer of the present invention;

[0036] Figure 4 It is a schematic diagram of the structure of the substrate layer of the present invention;

[0037] Figure 5 The present invention is a flow chart of the method for preparing the imide film.

[0038] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0039] 100, winding roller; 200, imide film body; 201, base material layer; 201a, film substrate; 201b, insulating layer; 201c, breathable layer; 202, protective layer; 202a, wear-resistant layer; 202a-1, wear-resistant coating; 202b, anti-wrinkle layer; 202c, toughness layer. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] See also Figure 1-4 In the invention, an imide film comprises a winding drum 100 and an imide film body 200, wherein the imide film body 200 is wound and connected to the middle part of the winding drum 100, and the imide film body 200 comprises a substrate layer 201, and a protective layer 202 is laid on the front and back sides of the substrate layer 201, respectively, and the protective layer 202 comprises a wear-resistant layer 202a, and an anti-wrinkle layer 202b is bonded to the bottom of the wear-resistant layer 201a, and a toughness layer 202c is also bonded to the side of the anti-wrinkle layer 202b away from the wear-resistant layer 201a, and the substrate layer 201 comprises a film substrate 201a, and insulating layers 201b are respectively bonded to the front and back sides of the film substrate 201a, and air-permeable layers 201c are also bonded to the outer sides of the two groups of insulating layers 201b.

[0042] The outer surface of the wear-resistant layer 202a is sprayed with a wear-resistant coating 202a-1, which is a metal nitride coating. The wear-resistant coating 202a-1 sprayed on the outer surface of the wear-resistant layer 202a, and the wear-resistant coating 202a-1 is a metal nitride coating. The application of the metal nitride coating in the imide film helps to improve the performance and function of the film, increase its wear resistance, chemical stability, thermal insulation, hardness and barrier properties, which enables the imide film to play a role in a wider range of application fields.

[0043] The wear-resistant layer 202a is made of silicon carbide material. The wear-resistant layer 202a in this solution is made of silicon carbide material. By applying the silicon carbide wear-resistant layer 202a on the imide film, the wear resistance and service life of the imide film can be greatly enhanced, so that it can be used in more harsh environments, such as automotive parts, tool coatings, aerospace fields, etc.

[0044] The anti-wrinkle layer 202b is a polyethylene film, and the insulating layer 201b in this solution is made of polyvinylidene fluoride. By applying divinylidene fluoride in the imide film, its chemical stability, high temperature stability, electrical insulation, weather resistance and biocompatibility can be fully utilized, which enables the imide film to play a role in a wider range of fields, such as electronic device packaging, medical fields, chemical applications, etc.

[0045] The anti-wrinkle layer 202b in this solution is a polyethylene film. By applying the polyethylene film to the imide film, its flexibility, electrical insulation, transparency, moisture resistance and recyclability can be fully utilized to meet the needs of different fields, such as packaging, agricultural covering, electronics and electrical, etc.

[0046] The toughness layer 202c is a glass fiber mesh cloth. The toughness layer 202c in this solution is a glass fiber mesh cloth. By using the glass fiber mesh cloth, the strength, stiffness, tear resistance and wrinkle resistance of the imide film can be significantly improved, while the heat resistance and dimensional stability can be increased, which enables the imide film to play a role in a wider range of application fields, such as building insulation materials, aerospace fields, electronic device packaging, etc.

[0047] The insulating layer 201b is made of polyvinylidene fluoride, and the breathable layer 201c is a PVA coated high barrier film. The breathable layer 201c in this solution is a PVA coated high barrier film. By applying the PVA coated high barrier film to the imide film, it can provide excellent barrier properties, protective properties and durability, and maintain the quality and stability of the packaged items. This allows the imide film to be widely used in food packaging, pharmaceutical packaging, electronic device packaging and other fields.

[0048] In order to better demonstrate an imide film, this embodiment now proposes a method for preparing an imide film, comprising the following steps:

[0049] S101: First, select an appropriate imide compound, such as polyimide, add it to a suitable solvent (such as N, N-dimethylacetamide), and fully dissolve it by stirring to ensure that the solution concentration and viscosity are suitable for the required film thickness and application requirements.

[0050] S102: Next, place the target substrate material (such as a glass sheet or a silicon wafer) on a flat surface, and use a coating tool (such as a scraper or a roller coater) to evenly coat the imide solution on the substrate surface. Ensure the uniformity and appropriate thickness of the film, which can be controlled by adjusting the coating speed and pressure.

[0051] S103: Then, the coated substrate material is placed in an environment of room temperature or slightly higher temperature to allow the solvent to evaporate slowly. This step can be accelerated by placing it on a flat plate or using slight heating in an oven. During the evaporation process, the imide solution gradually forms an imide film.

[0052] S104: Finally, the volatilized sample is placed on a hot plate or in an oven for heat treatment. According to the characteristics of the imide material used and the application requirements, the appropriate temperature and duration are selected. The heat treatment helps the cross-linking and curing of the imide film, and enhances its stability and mechanical properties.

[0053] S105: After the heat treatment is completed, the sample is cooled to room temperature to completely solidify the imide film. This can be achieved by natural cooling or using auxiliary means such as a cooling table. The cured imide film has the desired stability and structural properties and can be used in various applications.

[0054] Working principle: The structural design of the imide film is novel. When in use, the protective layers 202 are laid on the front and back sides of the substrate layer 201, and the two sets of protective layers 202 are respectively composed of a wear-resistant layer 202a, an anti-wrinkle layer 202b and a toughness layer 202c. The wear-resistant layer 202a, the anti-wrinkle layer 202b and the toughness layer 202c are used in combination to effectively improve the wear resistance and flexibility of the front and back sides of the substrate layer 201, and can effectively prevent the front and back sides of the substrate layer 201 from being worn, thus solving the problem of wrinkles or even breaks of the imide film under certain extreme conditions, such as repeated bending and winding operations;

[0055] This solution can enhance the insulation ability and corrosion resistance of the imide film body 200 by respectively bonding the insulating layer 201b on the front and back sides of the film substrate 201a, and can effectively improve the service life of the imide film body 200. By bonding the breathable layer 201c on the outside of the insulating layer 201b, the permeability between the film substrate 201a and the protective layer 202 added on the front and back sides can be improved, so as to dissipate the heat inside the imide film body 200.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0057] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An imide film, comprising a winding drum (100) and an imide film body (200), wherein the imide film body (200) is wound and connected to the middle of the winding drum (100), characterized in that: The imide film body (200) comprises a substrate layer (201), and protective layers (202) are respectively laid on the front and back sides of the substrate layer (201); The protective layer (202) comprises a wear-resistant layer (202a), an anti-wrinkle layer (202b) is bonded to the bottom of the wear-resistant layer (201a), and a toughness layer (202c) is bonded to the side of the anti-wrinkle layer (202b) away from the wear-resistant layer (201a); The base material layer (201) comprises a film substrate (201a), and insulating layers (201b) are respectively bonded to the front and back sides of the film substrate (201a), and air-permeable layers (201c) are also bonded to the outer sides of the two groups of insulating layers (201b).

2. An imide film according to claim 1, characterized in that: The outer surface of the wear-resistant layer (202a) is sprayed with a wear-resistant coating (202a-1), and the wear-resistant coating (202a-1) is a metal nitride coating.

3. An imide film according to claim 2, characterized in that: The wear-resistant layer (202a) is made of silicon carbide material.

4. An imide film according to claim 3, characterized in that: The anti-wrinkle layer (202b) is a polyethylene film.

5. An imide film according to claim 4, characterized in that: The toughness layer (202c) is a glass fiber mesh cloth.

6. An imide film according to claim 5, characterized in that: The insulating layer (201b) is made of polyvinylidene fluoride.

7. An imide film according to claim 6, characterized in that: The breathable layer (201c) is a PVA-coated high-barrier film.

8. A method for preparing an imide film according to any one of claims 1 to 7, comprising the following steps: S101: First, select an appropriate imide compound, such as polyimide, add it to a suitable solvent (such as N, N-dimethylacetamide), and fully dissolve it by stirring to ensure that the solution concentration and viscosity are suitable for the required film thickness and application requirements. S102: Next, place the target substrate material (such as a glass sheet or a silicon wafer) on a flat surface, and use a coating tool (such as a scraper or a roller coater) to evenly coat the imide solution on the substrate surface. Ensure the uniformity and appropriate thickness of the film, which can be controlled by adjusting the coating speed and pressure. S103: Then, the coated substrate material is placed in an environment of room temperature or slightly higher temperature to allow the solvent to evaporate slowly. This step can be accelerated by placing it on a flat plate or using slight heating in an oven. During the evaporation process, the imide solution gradually forms an imide film. S104: Finally, the volatilized sample is placed on a hot plate or in an oven for heat treatment. According to the characteristics of the imide material used and the application requirements, the appropriate temperature and duration are selected. The heat treatment helps the cross-linking and curing of the imide film, thereby enhancing its stability and mechanical properties. S105: After the heat treatment is completed, the sample is cooled to room temperature to completely solidify the imide film. This can be achieved by natural cooling or using auxiliary means such as a cooling table. The cured imide film has the desired stability and structural properties and can be used in various applications.

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