CN112812335B - Colorless transparent polyimide film with high dimensional stability and mechanical strength and preparation method thereof - Google Patents
Colorless transparent polyimide film with high dimensional stability and mechanical strength and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of polyimide films, and particularly relates to a polyimide filmAnd a method for preparing a colorless transparent polyimide film having high dimensional stability and mechanical strength. The method comprises the following steps: 1) Quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head, and coating the polyimide slurry on a support membrane through the slit coating head; 2) Then sequentially passes through all zones T of the low-temperature section drying oven at the machine speed of 3-8m/min 1 ‑T 3 Removing more than 85% of the solvent, wherein T 1 The temperature is 40-80 ℃ and T 2 The temperature is 90-110 ℃ and T 3 The temperature is 120-150 ℃; 3) Then peeling off the support film and entering a high-temperature section oven area for heat treatment at a heat treatment temperature T 4 Is 270-310 ℃; 4) And finally, cooling and rolling. The method improves the dimensional stability and the mechanical property of the colorless transparent polyimide film by matching the low-temperature baking process and the high-temperature baking process.
Description
Technical Field
The application belongs to the technical field of polyimide films, and particularly relates to a preparation method of a colorless transparent polyimide film with high dimensional stability and mechanical strength.
Background
In recent years, flexible displays represented by foldable handsets have exhibited a rapidly growing situation and great market potential. The flexible display technology core is a flexible OLED display panel which is manufactured based on a polymer flexible substrate and comprises a substrate, a TFT layer, a light emitting layer, a blocking layer, a circular polarizer, a touch layer and a cover plate. The flexible and bendable characteristic requires that the display unit needs to be flexible, other functional layers including the TFT substrate, the touch unit and the cover plate also need to be flexible, and the colorless transparent polyimide film is a key supporting material for realizing the flexible and bendable screen. The main application scenes of the flexible and bendable AMOLED panel are a touch conductive base film and a cover plate base film. In addition, the colorless transparent polyimide film has a great application potential in flexible solar cells and wearable electronic equipment in the future.
Compared with yellow polyimide films, colorless transparent polyimide films have extremely high added value due to the characteristics of high light transmittance and low chroma. The steel tape casting method is the main method for producing colorless and transparent polyimide films at present, and comprises the procedures of casting, drying, double-drawing, imidization, rolling and the like, but the equipment is expensive, the monomer investment is 4-5 hundred million, and the process requirement is high for achieving the optical grade effect. Considering that the colorless transparent polyimide film has relatively lower requirements on mechanical strength compared with an electronic grade yellow polyimide film, and is mainly prepared by a chemical imidization method, the requirements on high-temperature processing and biaxial stretching are relatively lower. Therefore, by reasonably improving the traditional coating equipment and matching with a proper slurry formula and a support film, the production of the optical-grade transparent polyimide film by a precise coating technology is expected to be realized. More importantly, the precision coating equipment has the advantages of low investment and easier control compared with steel strip casting equipment. The patent publication CN201810207427.7 reports that a non-silicon PET release film with the thickness of 25-50 μm is used for producing an ultrathin polyimide film by an auxiliary coating method, but the process is mainly used for producing black polyimide with the thickness of 6-8 μm, and according to experience, the PET release film with the thickness of 25-50 μm is easy to warp and deform at a high-temperature process with the temperature of more than 120 ℃, so that the appearance of the obtained PI film is seriously influenced. In addition, patent publication CN201811140409.8 reports a method for preparing a transparent polyimide film by using a 188 μm PET release film auxiliary coating method, but only a low-temperature baking process of drying at 80-160 ℃ for 5-15min easily causes more residual stress in the film, and the dimensional thermal stability is poor, and meanwhile, the residual amount of the solvent in the film is relatively high, so that the mechanical properties of the film are lost. Therefore, the research on a novel coating process to realize the colorless transparent polyimide film with excellent comprehensive properties such as high transparency, high dimensional stability, high mechanical strength and the like has a general meaning.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a preparation method of a colorless transparent polyimide film, and the method can volatilize a solvent at a relatively stable speed through gradient temperature rise in a low-temperature section, gradually solidify to form a film, and keep the appearance of the film smooth, good light transmittance and low haze; the heat treatment of the high-temperature section can play a role in deep imidization and further removing residual solvent, and meanwhile, when the heat treatment temperature reaches the vicinity of the glass transition temperature of the film, the movement rearrangement of the chain segments can release the stress in the film, thereby playing a role in heat setting. Finally, the prepared colorless transparent polyimide film has high light transmittance, high dimensional thermal stability and high mechanical property due to the reasonable matching of the gradient temperature rise in the low-temperature section and the heat treatment in the high-temperature section.
In order to achieve the above object, the present application adopts the following technical solutions:
a method for preparing a colorless transparent polyimide film, comprising the steps of:
1) Quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head, and coating the polyimide slurry on a support membrane through the slit coating head;
2) Sequentially passes through all the zones T of the low-temperature section drying oven at the machine speed of 3-8m/min 1 -T 3 Wherein T is 1 The temperature is 40-80 ℃ and T 2 The temperature is 90-110 ℃ and T 3 The temperature is 120-150 ℃, and the total drying time of the low-temperature oven section is 6-12min;
3) Stripping from the support film and entering a high-temperature section oven area for heat treatment at a heat treatment temperature T 4 The temperature is 270-310 ℃, and the heat treatment time of the high-temperature oven section is 5-10min;
4) And (6) cooling and rolling.
Preferably, the colorless transparent polyimide film can be produced by a thermal imidization method or a chemical imidization method, and a chemical imidization method is more preferred. Preferably, the thickness of the colorless transparent polyimide film is 10-50 μm.
Preferably, the temperature raising device comprises a low-temperature section and a high-temperature section two-stage temperature raising section, wherein T of the low-temperature section is 1 At 60-80 deg.C, T 2 At a temperature of 90-100 ℃ and T 3 130-140 deg.C, heat treatment temperature T of high temperature section 4 The temperature is 280-300 ℃.
Preferably, the total drying time of the low-temperature oven section is 6-12min, the heat treatment time of the high-temperature oven section is 5-10min, and the preferable time is 5-8min
Preferably, T is 1 Drying at a temperature of 1-3min, preferably 1-2min 2 Drying at a temperature of 2-4min, preferably 2-3min 3 Drying at temperature for 3-5min.
Preferably, the support film is a PET film, a PET release film, a PI release film or a PTFE film.
Preferably, the thickness of the support film is 30 to 180 μm. The width can be adjusted according to actual production requirements, and the final result of the application is not influenced.
Preferably, the colorless transparent polyimide paste has a solid content of 5 to 18wt%. And more preferably 10-18%, too low solid content makes the thickness uniformity of the film difficult to control, while too high solid content can block the coating head, resulting in uneven coating.
Preferably, the solvent of the colorless transparent polyimide paste is one of N-methylpyrrolidone, N-dimethylformamide, N-dimethylacetamide, or propylene glycol methyl ether acetate, and N, N-dimethylacetamide and propylene glycol methyl ether acetate are preferred.
Further, the application also discloses the colorless transparent polyimide film prepared by the method, wherein the transmittance of the colorless transparent polyimide film at full wavelength is 90-92%, the yellow index is 1.4-1.8, the tensile strength is 130-160MPa, and the thermal expansion coefficient is 20-30 ppm/DEG C.
The technical scheme that this application provided has following beneficial effect: the colorless transparent polyimide film is prepared by adopting a precise coating method, so that the equipment cost can be obviously reduced; and further, the colorless transparent polyimide film prepared by reasonably matching the gradient temperature rise of the low-temperature section and the high-temperature heat treatment has high light transmittance, dimensional stability and mechanical strength, and meanwhile, the preparation method is simple in production process, low in overall production cost and wide in application prospect.
Drawings
FIG. 1 is a schematic view of an apparatus for a method of preparing a colorless transparent polyimide film according to the present application.
The specific implementation mode is as follows:
the following detailed description of the preferred embodiments of the present application is provided to enable those skilled in the art to more readily understand the advantages and features of the present application and to thereby make better clear the definition of the scope of the present application.
Example 1
The synthesized colorless transparent polyimide uniform slurry is fixed through a gearQuantitatively conveying the polyimide slurry to a slit type coating head by a metering pump, coating the polyimide slurry on a 125-micron PET support film by the slit coating head, wherein the solid content of the slurry is 15wt%, and the used organic solvent is N, N-dimethylacetamide. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 Zone temperature is 80 ℃, residence time is 1min 2 Zone temperature 100 deg.C, residence time 3min, T 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 300 ℃ for 8min, and finally cooling and rolling to obtain a finished colorless transparent polyimide film with the thickness of 25 mu m. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 2
The difference from example 1 lies in the high temperature section T 4 The heat treatment temperature is different as follows:
quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, and coating the polyimide slurry on a 125-micron PET support film through the slit coating head, wherein the solid content of the slurry is 15wt%, and the used organic solvent is N, N-dimethylacetamide. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone of which T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 280 ℃ for 8min, and finally cooling and rolling to obtain a finished colorless transparent polyimide film with the thickness of 25 mu m. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 3
The difference from example 1 lies in the high temperature section T 4 The difference of the heat treatment time is as follows:
the synthesized colorless transparent polyimide isThe uniform slurry is quantitatively conveyed to a slit type coating head through a gear quantitative pump, the polyimide slurry is coated on a 125-micron PET support film through the slit coating head, the solid content of the slurry is 15wt%, and the used organic solvent is N, N-dimethylacetamide. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 300 ℃ for 5min, and finally cooling and rolling to obtain a finished colorless transparent polyimide film with the thickness of 25 mu m. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 4
The difference from example 1 lies in the high temperature section T 4 The difference of the heat treatment time is as follows:
quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, and coating the polyimide slurry on a 125-micron PET support film through the slit coating head, wherein the solid content of the slurry is 15wt%, and the used organic solvent is N, N-dimethylacetamide. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 300 ℃ for 10min, and finally cooling and rolling to obtain a finished colorless transparent polyimide film with the thickness of 25 mu m. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 5
The difference from example 1 lies in the low temperature section T 3 The different heat preservation time is as follows:
to be synthesizedThe colorless transparent polyimide uniform slurry is quantitatively conveyed to a slit coating head through a gear quantitative pump, the polyimide slurry is coated on a 125-micron PET support film through the slit coating head, the solid content of the slurry is 15wt%, and the used organic solvent is N, N-dimethylacetamide. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 3min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 300 ℃ for 8min, and finally cooling and rolling to obtain a finished colorless transparent polyimide film with the thickness of 25 mu m. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 6
The difference from example 1 is the difference in the thickness of the PET support film used, in particular as follows:
quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, and coating the polyimide slurry on a 150-micron PET support film through the slit coating head, wherein the solid content of the slurry is 15wt%, and the used organic solvent is N, N-dimethylacetamide. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 The zone temperature was 80 ℃ and the residence time was 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 300 ℃ for 8min, and finally cooling and rolling to obtain a finished colorless transparent polyimide film with the thickness of 25 mu m. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 7
The difference from the example 1 is that the support film is a PET release film, which is specifically as follows:
will synthesizeQuantitatively conveying the color transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, coating the polyimide slurry on a 125 mu mPE release film with the release force of 100gf through the slit coating head, wherein the solid content of the slurry is 15wt%, and the used organic solvent is N, N-dimethylacetamide. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 ℃, the time is 5min, then the solidified film is stripped from the release film by a stripping roller, the high-temperature section oven zone is continuously entered for heat treatment, and the heat treatment temperature T is 4 Standing at 300 ℃ for 8min, and finally cooling and rolling to obtain a finished colorless transparent polyimide film with the thickness of 25 mu m. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 8
The difference from example 1 is that the colorless transparent polyimide paste used is different in solvent, specifically as follows:
quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, coating the polyimide slurry on a 125-micron PET support film through the slit coating head, wherein the solid content of the slurry is 15wt%, and the used organic solvent is propylene glycol monomethyl ether acetate. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone of which T 1 Zone temperature is 80 ℃, residence time is 1min 2 Zone temperature 100 deg.C, residence time 3min, T 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 300 ℃ for 8min, and finally cooling and rolling to obtain a finished colorless transparent polyimide film with the thickness of 25 mu m. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 9
The difference from example 1 is the solid content of the colorless transparent polyimide paste used, which is as follows:
quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, and coating the polyimide slurry on a 125-micron PET support film through the slit coating head, wherein the solid content of the slurry is 10wt%, and the used organic solvent is N, N-dimethylacetamide. The support film loaded with the uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone of which T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at T 4 Standing at 300 deg.C for 8min, cooling, and rolling to obtain colorless transparent polyimide film with thickness of 13 μm. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 10
The difference from example 8 is that the colorless transparent polyimide paste used is different in solvent, specifically as follows:
quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, coating the polyimide slurry on a 125-micron PET support film through the slit coating head, wherein the solid content of the slurry is 10wt%, and the used organic solvent is propylene glycol monomethyl ether acetate. The support film loaded with the uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 300 ℃ for 8min, and finally cooling and rolling to obtain a finished colorless transparent polyimide film with the thickness of 13 mu m. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 11
The difference from the example 8 is that the support film used is a PET release film, which is specifically as follows:
quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, and coating the polyimide slurry on a 125 mu mPE release film with the release force of 100gf through the slit coating head, wherein the solid content of the slurry is 10wt%, and the used organic solvent is N, N-dimethylacetamide. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 Zone temperature is 80 ℃, residence time is 1min 2 Zone temperature 100 deg.C, residence time 3min, T 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 300 deg.C for 8min, cooling, and rolling to obtain colorless transparent polyimide film with thickness of 13 μm. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 12
The difference from example 8 lies in the low temperature section T 3 The different heat preservation time is as follows:
quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, and coating the polyimide slurry on a 125-micron PET support film through the slit coating head, wherein the solid content of the slurry is 10wt%, and the used organic solvent is N, N-dimethylacetamide. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone of which T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 3min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at T 4 Standing at 300 ℃ for 8min, and finally cooling and rolling to obtain a finished colorless transparent polyimide film with the thickness of 13 mu m. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 13
The difference from example 1 is the solid content of the colorless transparent polyimide paste, which is as follows:
quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, and coating the polyimide slurry on a 125-micron PET support film through the slit coating head, wherein the solid content of the slurry is 20wt%, and the used organic solvent is N, N-dimethylacetamide. The support film loaded with the uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at T 4 Standing at 300 deg.C for 8min, cooling, and rolling to obtain colorless transparent polyimide film with thickness of 50 μm. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 14
The difference from example 12 is that the colorless transparent polyimide paste used was different in solvent as follows:
quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, coating the polyimide slurry on a 125-micron PET support film through the slit coating head, wherein the solid content of the slurry is 20wt%, and the used organic solvent is propylene glycol monomethyl ether acetate. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 300 deg.C for 8min, cooling, and rolling to obtain colorless transparent polyimide film with thickness of 50 μm. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 15
The difference from example 12 is that the support film used is a PET release film, which is specifically as follows:
quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, and coating the polyimide slurry on a 125 mu mPE release film with the release force of 100gf through the slit coating head, wherein the solid content of the slurry is 20wt%, and the used organic solvent is N, N-dimethylacetamide. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone of which T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 300 deg.C for 8min, cooling, and rolling to obtain colorless transparent polyimide film with thickness of 50 μm. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Example 16
The difference from example 12 lies in the low temperature section T 3 The different heat preservation time is as follows:
quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, and coating the polyimide slurry on a 125-micron PET support film through the slit coating head, wherein the solid content of the slurry is 20wt%, and the used organic solvent is N, N-dimethylacetamide. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 The zone temperature was 80 ℃ and the residence time was 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 3min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 300 deg.C for 8min, cooling, and rolling to obtain colorless transparent polyimide film with thickness of 50 μm. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Comparative example 1
Quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, and coating the polyimide slurry on a 125-micron PET support film through the slit coating head, wherein the solid content of the slurry is 15wt%, and the used organic solvent is N, N-dimethylacetamide. The supporting film loaded with uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 And keeping the temperature of the zone at 130 ℃ for 5min, then stripping the cured film from the supporting film by using a stripping roller, cooling and rolling to obtain a finished colorless transparent polyimide film with the thickness of 25 mu m. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
Comparative example 2
Quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head through a gear quantitative pump, and coating the polyimide slurry on a 125-micron PET support film through the slit coating head, wherein the solid content of the slurry is 15wt%, and the used organic solvent is N, N-dimethylacetamide. The support film loaded with the uniform slurry sequentially passes through the T of the low-temperature section drying oven under the action of the traction roller 1 -T 3 Zone, wherein T 1 Zone temperature is 80 ℃, residence time is 1min 2 The zone temperature was 100 deg.C, residence time was 3min 3 The zone temperature is 130 deg.C, standing for 5min, peeling off the cured film from the support film with a peeling roller, and continuously entering into a high-temperature section oven zone for heat treatment at a heat treatment temperature T 4 Standing at 300 deg.C for 12min, cooling, and rolling to obtain 25 μm thick colorless transparent polyimide film. The appearance and properties of the obtained colorless transparent polyimide film are shown in Table 1.
TABLE 1 appearance and Properties of colorless transparent polyimide films in the technical solutions described in examples 1 to 16 and comparative examples 1 to 2
As can be seen from Table 1, the reasonable combination of the gradient temperature rise in the low temperature section and the heat treatment in the high temperature section, and the selection of the proper baking temperature, baking time, solvent and stripping force can significantly improve the thermal dimensional stability and mechanical strength of the colorless transparent polyimide film, compared with the gradient temperature rise process only in the low temperature section, so that the prepared colorless transparent polyimide film has a full-wavelength transmittance of 90-92%, a yellow index of 1.4-1.8, a tensile strength of 130-160MPa, and a thermal expansion coefficient of 20-30 ppm/DEG C.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (9)
1. A method for preparing a colorless transparent polyimide film, which is characterized by comprising the following steps:
1) Quantitatively conveying the synthesized colorless transparent polyimide uniform slurry to a slit coating head, and coating the polyimide slurry on a support membrane through the slit coating head;
2) Sequentially passes through all the zones T of the low-temperature section drying oven at the machine speed of 3-8m/min 1 -T 3 Wherein T is 1 The temperature is 40-80 ℃ and T 2 The temperature is 90-110 ℃ and T 3 The temperature is 120-150 ℃, and the total drying time of the low-temperature section drying oven is 6-12min;
3) Stripping from the support film and entering a high-temperature section oven area for heat treatment at a heat treatment temperature T 4 Heat of high temperature oven section at 270-310 deg.CThe treatment time is 5-10min;
4) And (6) cooling and rolling.
2. The production method according to claim 1, wherein the colorless transparent polyimide film has a thickness of 10 to 50 μm.
3. The method according to claim 1, comprising two temperature raising sections, a low temperature section and a high temperature section, wherein T of the low temperature section is T 1 At 60-80 deg.C, T 2 At a temperature of 90-100 ℃ and T 3 The temperature of the heat treatment is 130-140 ℃, and the heat treatment temperature T of the high-temperature section 4 The temperature is 280-300 ℃.
4. The method of claim 1, wherein T is 1 Drying time at temperature of 1-3min 2 The drying time at the temperature is 2-4min 3 Drying at temperature for 3-5min.
5. The production method according to claim 1, wherein the support film is a PET film, a PET release film, a PI release film, or a PTFE film.
6. The production method according to claim 5, wherein the support film has a thickness of 30 to 180 μm.
7. The method according to claim 1, wherein the colorless transparent polyimide paste has a solid content of 5 to 18wt%.
8. The method according to claim 1, wherein the solvent of the colorless transparent polyimide paste is one or more selected from the group consisting of N-methylpyrrolidone, N-dimethylformamide, N-dimethylacetamide and propylene glycol methyl ether acetate.
9. The method according to claim 1, wherein the solvent of the colorless transparent polyimide paste is N, N-dimethylacetamide or propylene glycol methyl ether acetate.
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