CN113185719A - Solvent of alignment film, alignment film solution, preparation method of alignment film and application of alignment film - Google Patents
Solvent of alignment film, alignment film solution, preparation method of alignment film and application of alignment film Download PDFInfo
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- 239000002904 solvent Substances 0.000 title claims abstract description 113
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 45
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000011248 coating agent Substances 0.000 claims abstract description 33
- 238000000576 coating method Methods 0.000 claims abstract description 33
- ZFPGARUNNKGOBB-UHFFFAOYSA-N 1-Ethyl-2-pyrrolidinone Chemical compound CCN1CCCC1=O ZFPGARUNNKGOBB-UHFFFAOYSA-N 0.000 claims abstract description 25
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims abstract description 17
- XXJWXESWEXIICW-UHFFFAOYSA-N diethylene glycol monoethyl ether Chemical compound CCOCCOCCO XXJWXESWEXIICW-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000010408 film Substances 0.000 claims description 196
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 claims description 32
- 239000004642 Polyimide Substances 0.000 claims description 23
- 229920001721 polyimide Polymers 0.000 claims description 23
- 229920005575 poly(amic acid) Polymers 0.000 claims description 11
- 239000000758 substrate Substances 0.000 claims description 11
- 239000010409 thin film Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 6
- LZDKZFUFMNSQCJ-UHFFFAOYSA-N 1,2-diethoxyethane Chemical compound CCOCCOCC LZDKZFUFMNSQCJ-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 description 13
- 239000000203 mixture Substances 0.000 description 13
- 239000007787 solid Substances 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- RGOVYLWUIBMPGK-UHFFFAOYSA-N nonivamide Chemical compound CCCCCCCCC(=O)NCC1=CC=C(O)C(OC)=C1 RGOVYLWUIBMPGK-UHFFFAOYSA-N 0.000 description 1
- 229920000548 poly(silane) polymer Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010023 transfer printing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
- C08J3/091—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids characterised by the chemical constitution of the organic liquid
- C08J3/096—Nitrogen containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
- C08J3/091—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids characterised by the chemical constitution of the organic liquid
- C08J3/095—Oxygen containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
- C08J3/11—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids from solid polymers
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
- C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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Abstract
The invention discloses a solvent of an alignment film, an alignment film solution, a preparation method of the alignment film and application of the alignment film solution. According to the invention, the combination of N-methyl pyrrolidone, N-ethyl pyrrolidone, ethylene glycol butyl ether and diethylene glycol ethyl ether is used as a solvent for dissolving the alignment film material, so that the uniformity and edge collimation of the prepared alignment film solution during coating are improved.
Description
Technical Field
The invention relates to the technical field of display devices, in particular to a solvent of an alignment film, an alignment film solution, a preparation method of the alignment film and application of the alignment film.
Background
The PSVA alignment technology of the TFT-LCD (thin film transistor liquid crystal display) panel can use an alignment film, and the alignment film performs alignment with liquid crystal to form a pre-tilt angle so that the panel product can achieve the effect of rapidly displaying pictures. The alignment film is usually prepared by dissolving an alignment film material in a solvent to form an alignment film solution, and then spraying the solution onto a substrate by a device to prepare a thin film, because the pre-tilt angle is provided for panel display, the uniformity of the alignment film coating and the edge collimation need to be ensured, so that the film cannot be extended to the frame glue coating position to cause peeling or edge display abnormality.
The solvent conventionally used for dissolving alignment film materials is basically NMP (N-methylpyrrolidone): BC (ethylene glycol butyl ether) is 45:55, and an alignment film solution prepared using the solvent has a problem of uneven coating and poor alignment when coated.
Disclosure of Invention
The invention mainly aims to provide a solvent for an alignment film, an alignment film solution, a preparation method of the alignment film and application thereof, and aims to provide a solvent for dissolving an alignment film material, which can improve the coating uniformity and edge collimation of the alignment film solution.
In order to achieve the above object, the present invention provides a solvent for an alignment film, the solvent for the alignment film comprising N-methylpyrrolidone, N-ethylpyrrolidone, ethylene glycol butyl ether and diethylene glycol ethyl ether.
Optionally, the solvent of the alignment film further includes diacetone alcohol.
Optionally, in the solvent of the alignment film, the total volume percentage of the N-methylpyrrolidone and the N-ethylpyrrolidone is 30-40%, and the total volume percentage of the ethylene glycol butyl ether, the diethylene glycol ethyl ether and the diacetone alcohol is 60-70%.
Optionally, the volume percentage of the N-methyl pyrrolidone, the N-ethyl pyrrolidone, the ethylene glycol butyl ether, the diethylene glycol ethyl ether and the diacetone alcohol in the solvent of the alignment film is 10-20%, 15-25%, 20-30%, 25-35% and 5-15% respectively.
Alternatively, the volume percentages of the N-methylpyrrolidone, N-ethylpyrrolidone, ethylene glycol butyl ether, diethylene glycol ethyl ether, and diacetone alcohol in the solvent of the alignment film correspond to 15%, 20%, 25%, 30%, and 10%.
In order to achieve the above object, the present invention further provides an alignment film solution, which includes a solvent and an alignment film material dissolved in the solvent, wherein the solvent is the solvent of the alignment film as described above.
Optionally, the alignment film material is polyimide; alternatively, the alignment film material includes polyimide and polyamic acid.
Optionally, the mass concentration of the alignment film material in the alignment film solution is 3.4-3.9%.
In order to achieve the above object, the present invention further provides a method for preparing an alignment film, comprising the following steps:
dissolving an alignment film material in a solvent to prepare an alignment film solution, wherein the solvent is the above-mentioned solvent for the alignment film;
and coating the alignment film solution on a substrate to form a liquid film, and drying the liquid film to form a thin film to obtain the alignment film.
Furthermore, the invention also provides a display panel, which comprises the alignment film, wherein the alignment film is prepared by the preparation method of the alignment film.
In the technical scheme provided by the invention, the solubility and the coating property of the alignment film material are fully considered, and the combination of N-methyl pyrrolidone, N-ethyl pyrrolidone, ethylene glycol butyl ether and diethylene glycol ethyl ether is selected as a solvent for dissolving the alignment film material, so that the uniformity and the edge collimation property of the prepared alignment film solution during coating are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a diagram illustrating the edge alignment effect of a conventional solution-coated alignment film prepared from a solvent;
fig. 2 is a graph showing the edge alignment effect when the solution of the alignment film prepared from the alignment film solvent provided by the present invention is coated.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The solvent conventionally used for dissolving alignment film materials is basically NMP (N-methylpyrrolidone): BC (ethylene glycol butyl ether) is 45:55, and an alignment film solution prepared using the solvent has a problem of uneven coating and poor alignment when coated.
In order to solve the technical problem, the invention provides a solvent for an alignment film, which is a novel solvent for dissolving an alignment film material, wherein the solvent for the alignment film comprises N-methyl pyrrolidone, N-ethyl pyrrolidone, ethylene glycol butyl ether and diethylene glycol ethyl ether.
In the technical scheme provided by the invention, the solubility and the coating property of the alignment film material are fully considered, and the combination of N-methyl pyrrolidone (NMP), N-ethyl pyrrolidone (NEP), ethylene glycol butyl ether (BC) and diethylene glycol ethyl ether (DGME) is selected as a solvent for dissolving the alignment film material, so that the uniformity and the edge collimation property of the prepared alignment film solution during coating are improved. At present, alignment film materials most used in engineering are mainly classified into Polyamic acid (PAA) and Polyimide (PI), firstly, in consideration of the specificity of the structure of the alignment film material, NMP has better solubility to the alignment film material, BC has better affinity to a substrate (usually a thin film transistor array substrate) for coating the alignment film, and a rapid leveling effect can be achieved. Based on the two considerations, the solvent component selection provided by the invention is similar to the chemical properties of NMP and BC, and in order to delay the pre-baking drying time and further enhance the leveling property, the combination of NEP and DGME is selected on the basis of NMP and BC, wherein the NEP and DGME have properties close to those of NMP but boiling points higher than that of NMP, so that the good solubility is realized on an alignment film material, and the problems of uneven film thickness and uneven layering caused by rapid solvent evaporation can be delayed; DGME has the property close to that of BC, but the boiling point is higher than that of BC, so that better leveling property can be achieved, and the solvent can be delayed from being evaporated to dryness quickly.
Further, as a preferred embodiment of the solvent of the alignment film provided by the present invention, a component and Diacetone Alcohol (DA) are further added to the solvent of the alignment film, which can further enhance the affinity between the alignment film solution and the substrate, and is helpful for leveling the alignment film solution.
The solvent for dissolving the alignment film material generally comprises a first solvent with a dissolving effect and a second solvent with a leveling effect, and in a traditional solvent formula, the volume ratio of the first solvent to the second solvent is usually 9:11, so that the alignment film material is often not sticky. In the novel solvent formula provided by the invention, the volume ratio of the first solvent to the second solvent is adjusted, so that the volume percentage of the first solvent to the second solvent in the solvent of the alignment film is 30-40% and 60-70%, namely the volume percentage of NMP and NEP is 30-40%, and the volume percentage of BC, DGME and DA is 60-70%, and experiments prove that the solvent in the proportional relation has good solubility to the alignment film material and can enhance the coating property.
Further, to enhance the improvement effect of coating uniformity, the ratio of NEP and DGME in the solvent of the alignment film may be adjusted to be appropriately higher than the NMP and BC, specifically: the volume percentages of the N-methyl pyrrolidone, the N-ethyl pyrrolidone, the ethylene glycol butyl ether, the diethylene glycol ethyl ether and the diacetone alcohol in the solvent of the alignment film are 10-20%, 15-25%, 20-30%, 25-35% and 5-15% respectively. Under the condition of the preparation proportion, the solvent of the alignment film can achieve a further improvement effect on the coating uniformity on the basis of ensuring good solubility to the alignment film material.
Furthermore, in a preferred embodiment of the present invention, experiments have determined that the optimal ratio of the components in the solvent of the alignment film is: the volume percentages of the N-methylpyrrolidone, N-ethylpyrrolidone, butyl glycol ether, diethylene glycol ethyl ether, and diacetone alcohol in the solvent of the alignment film correspond to 15%, 20%, 25%, 30%, and 10%. Under the proportional relationship, the volume ratio of the first solvent (NMP + NEP) to the second solvent (DGME + BC + DA) in the solvent of the alignment film is 7:13, the improvement effect on the solubility of the alignment film material and the coating property of the alignment film solution can be optimized, and tests prove that the solvent of the alignment film provided by the embodiment of the invention has the following three improvement effects compared with the conventional solvent: (1) the coating uniformity is improved from 4.88% to 5.34%; (2) the edge collimation property becomes better, fig. 1 shows the edge collimation effect graph of the alignment film solution obtained by the traditional solvent preparation when coating, fig. 2 shows the edge collimation effect graph of the alignment film solution obtained by the solvent preparation provided by the invention when coating, and the arrows in fig. 1 and fig. 2 indicate the edge lines when coating, as can be seen from the comparison of fig. 1 and fig. 2, the edge lines formed by coating with the traditional solvent are curved curves, while the edge lines formed by coating with the solvent of the invention are relatively more collimated; (3) the edge alignment force is better, and the incidence rate of edge mura is reduced from 37.66% to 0.78%.
Based on the above-mentioned solvent for the alignment film, the present invention further provides an alignment film solution, which includes a solvent and an alignment film material dissolved in the solvent, wherein the solvent is the above-mentioned solvent for the alignment film. The alignment film solution prepared by the solvent of the alignment film provided by the invention has good coating uniformity and edge collimation property during coating, and also has better edge alignment force, and the incidence of edge mura is reduced.
The solvent of the alignment film provided by the present invention can be applied to various common alignment film materials, such as polyvinyl alcohol, polystyrene and its derivatives, polyurethane, polyester, epoxy resin, polysilane, polyimide, etc., and the common alignment film materials currently used in engineering applications are generally Polyimide (PI) and polyamic acid (PAA), so in an embodiment of the alignment film solution provided by the present invention, the alignment film material is PI; in another embodiment of the alignment film solution provided by the present invention, the alignment film material comprises PI and PAA. In the two embodiments, the solvent of the alignment film has good solubility to the alignment film material, and the effects of improving the coating uniformity and edge alignment when the alignment film solution is coated can be achieved.
For practical engineering applications, the conventional alignment film material is typically a mixture of PI and PAA, while the conventional NMP: the BC is 45:55 of the alignment film solvent, which may cause poor PI delamination and poor alignment force when the alignment film solution is baked after coating, and further cause different pretilt angles, resulting in the display panel being prone to edge mura. When the novel alignment film solvent provided by the invention is adopted to prepare the alignment film solution, the edge alignment force of the alignment film formed by coating can be better no matter in the traditional scheme of selecting PI + PAA as the alignment film material or in the scheme of selecting only PI as the alignment film material, and the occurrence rate of edge mura is effectively reduced.
In addition, the solid content of the alignment film solution can be regulated and controlled according to conventional requirements in the field, and in a specific embodiment of the alignment film solution provided by the invention, the solid content of the alignment film solution is preferably 3.4-3.9%, that is, the mass concentration of the alignment film material in the alignment film solution is 3.4-3.9%. In the solid content range, the alignment film material can be fully and uniformly dissolved in the solvent of the alignment film, and the coating uniformity of the alignment film solution can be ensured.
Further, based on the above-mentioned solvent for the alignment film, the present invention also provides a method for preparing the alignment film, which comprises preparing an alignment film solution by using the above-mentioned solvent for the alignment film, and then coating and drying the alignment film solution to obtain the alignment film. In an embodiment of the method for manufacturing an alignment film provided by the present invention, the method for manufacturing an alignment film includes the following steps:
step S10, dissolving the alignment film material in a solvent to prepare an alignment film solution, wherein the solvent is the above-mentioned alignment film solvent;
and step S20, coating the alignment film solution on a substrate to form a liquid film, and drying the liquid film to form a thin film to obtain the alignment film.
Firstly, dissolving an alignment film material in the solvent of the alignment film provided by the invention, so that the alignment film material is fully dissolved to prepare an alignment film solution, wherein the type of the alignment film material is not limited, any material which can be used for preparing the alignment film of the TFT-LCD panel in the field can be selected, and PI or a mixture of PI and PAA is preferred; the solid content of the alignment film solution is 3.4-3.9%. Then, the alignment film solution is coated on the substrate (usually a thin film transistor array substrate) by a method commonly used in the art such as transfer printing or ink jet to form a liquid film, and then the liquid film is heated and cured to completely volatilize the solvent to form a thin film, so that the alignment film is prepared. The main improvement point of the preparation method of the alignment film provided by the invention is that the novel alignment film solvent provided by the invention is adopted, and the processes such as heating and curing of the coating machine and the like can refer to the traditional processes in the field specifically, and are not described herein in detail. Next, after step S20, a step of aligning the alignment film is further included, which is performed in a manner similar to that in the related art. In addition, before step S10, a step of preparing a solvent for the alignment film may be further included, and the preparation may be performed according to the formula provided in the present invention.
In the preparation method of the alignment film, the novel alignment film solvent provided by the invention is adopted, so that the pre-baking drying time is delayed in the heating and curing process of the alignment film, the leveling property can be enhanced, the coating uniformity and the edge collimation property are improved, the edge alignment force is improved, and the edge mura occurrence rate is reduced, wherein compared with the traditional solvent, the coating uniformity is improved to 5.34% from 4.88%, and the edge mura occurrence rate is reduced to 0.78% from 37.66%.
In addition, the invention further provides a display panel, which comprises an alignment film, wherein the alignment film is prepared by the preparation method of the alignment film, and the specific flow steps of the preparation method of the alignment film refer to the embodiment. It can be understood that, since the display panel of the present invention adopts all the technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and are not described in detail herein.
The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, it should be understood that the following examples are merely illustrative of the present invention and are not intended to limit the present invention.
Example 1
Solvent composition (volume percent) of alignment film: NMP 10%, NEP 25%, BC 30%, DGME 30%, DA 5%.
Example 2
Solvent composition (volume percent) of alignment film: NMP 20%, NEP 15%, BC 20%, DGME 35%, DA 10%.
Example 3
Solvent composition (volume percent) of alignment film: NMP 15%, NEP 20%, BC 25%, DGME 30%, DA 10%.
Example 4
Solvent composition (volume percent) of alignment film: NMP 20%, NEP 20%, BC 25%, DGME 25%, DA 10%.
Example 5
Solvent composition (volume percent) of alignment film: 15% of NMP, 15% of NEP, 20% of BC, 35% of DGME and 15% of DA.
Example 6
The composition (mass percent) of the alignment film solution is as follows: PI 3.4% and solvent (example 1) 96.6%.
Example 7
The composition (mass percent) of the alignment film solution is as follows: PI 3.5% and solvent (example 2) 96.5%.
Example 8
The composition (mass percent) of the alignment film solution is as follows: PI 3.6%, solvent (example 3) 96.4%.
Example 9
The composition (mass percent) of the alignment film solution is as follows: PI 3.7%, solvent (example 4) 96.3%.
Example 10
The composition (mass percent) of the alignment film solution is as follows: PI 3.8% and solvent (example 5) 96.2%.
Example 11
The composition (mass percent) of the alignment film solution is as follows: PI + PAA 3.9%, solvent (example 3) 96.1%.
Example 12
The preparation method of the alignment film comprises the following steps: the alignment film solution of example 8 was coated on a thin film transistor array substrate to form a liquid film, and then cured by heating to completely volatilize the solvent to form a thin film, thereby obtaining an alignment film formed on the substrate.
The above is only a preferred embodiment of the present invention, and it is not intended to limit the scope of the invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (10)
1. A solvent for an alignment film, characterized in that the solvent for the alignment film comprises N-methylpyrrolidone, N-ethylpyrrolidone, ethylene glycol butyl ether and diethylene glycol ethyl ether.
2. The solvent for alignment film according to claim 1, wherein the solvent for alignment film further comprises diacetone alcohol.
3. The solvent for alignment film according to claim 2, wherein a total volume percentage of said N-methylpyrrolidone and N-ethylpyrrolidone is 30 to 40%, and a total volume percentage of said butyl cellosolve, diethyl cellosolve and diacetone alcohol is 60 to 70%.
4. The solvent for alignment film according to claim 2, wherein the N-methylpyrrolidone, N-ethylpyrrolidone, ethylene glycol butyl ether, diethylene glycol ethyl ether and diacetone alcohol are present in the solvent for alignment film in an amount of 10 to 20%, 15 to 25%, 20 to 30%, 25 to 35% and 5 to 15% by volume, respectively.
5. The solvent for alignment film according to claim 4, wherein the volume percentages of N-methylpyrrolidone, N-ethylpyrrolidone, ethylene glycol butyl ether, diethylene glycol ethyl ether, and diacetone alcohol in the solvent for alignment film are 15%, 20%, 25%, 30%, and 10%, respectively.
6. An alignment film solution, comprising a solvent and an alignment film material dissolved in the solvent, wherein the solvent is the alignment film solvent according to any one of claims 1 to 5.
7. The alignment film solution of claim 6, wherein the alignment film material is polyimide; alternatively, the alignment film material includes polyimide and polyamic acid.
8. The alignment film solution of claim 6, wherein the mass concentration of the alignment film material in the alignment film solution is 3.4-3.9%.
9. A preparation method of an alignment film is characterized by comprising the following steps:
dissolving an alignment film material in a solvent to prepare an alignment film solution, wherein the solvent is the alignment film solvent according to any one of claims 1 to 5;
and coating the alignment film solution on a substrate to form a liquid film, and drying the liquid film to form a thin film to obtain the alignment film.
10. A display panel comprising an alignment film produced by the method of claim 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103305236A (en) * | 2013-06-25 | 2013-09-18 | 深圳市华星光电技术有限公司 | Liquid crystal display (LCD) panel, alignment films thereof and preparation method of alignment films |
| CN104927881A (en) * | 2014-03-18 | 2015-09-23 | 达兴材料股份有限公司 | Liquid crystal alignment composition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103305236A (en) * | 2013-06-25 | 2013-09-18 | 深圳市华星光电技术有限公司 | Liquid crystal display (LCD) panel, alignment films thereof and preparation method of alignment films |
| CN104927881A (en) * | 2014-03-18 | 2015-09-23 | 达兴材料股份有限公司 | Liquid crystal alignment composition |
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