CN113204067B - Dyeing process of PVA film for polaroid and polaroid - Google Patents
Dyeing process of PVA film for polaroid and polaroid Download PDFInfo
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- CN113204067B CN113204067B CN202011105963.XA CN202011105963A CN113204067B CN 113204067 B CN113204067 B CN 113204067B CN 202011105963 A CN202011105963 A CN 202011105963A CN 113204067 B CN113204067 B CN 113204067B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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Abstract
The dyeing process of the PVA film for the polaroid comprises the steps of washing, swelling, dyeing, stretching, complementary color and drying, wherein the complementary color step specifically comprises the following steps: the stretched PVA film is immersed in a color compensation groove for color compensation, and the color compensation groove liquid comprises 0.1-0.5wt% of boric acid, 4.0-5.0wt% of potassium iodide and 1.5-2.0wt% of iodine.
Description
Technical Field
The invention relates to the technical field of polaroids, and in particular relates to a dyeing process of a PVA film for a polaroid and the polaroid.
Background
The polarizer is one of the most critical raw materials for flat panel display (especially liquid crystal display), after entering the 21 st century, along with the rapid development of TFT-LCD industry, the polarizer industry is correspondingly developed in China, the monopoly situation of overseas enterprises is broken, the product quantity of the industry is increased year by year at present, and a new development period is brought forward. The iodine polaroid is mainly obtained by dyeing iodine and potassium iodide and then stretching, the existing production process of the iodine polaroid is mature, but the problem that dyeing stripes appear when the polaroid is used due to uneven PVA dyeing still exists, and the problem that the experience degree of a user is poor when the display equipment is used is caused.
Disclosure of Invention
The invention aims to provide a dyeing process of a PVA film for a polaroid and the polaroid, and solves the problems that the existing PVA film for the polaroid is uneven in dyeing and the polaroid is striped in dyeing.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the dyeing process of the PVA film for the polaroid comprises the steps of washing the PVA film with water, swelling, dyeing, stretching, complementary color and drying, wherein the complementary color step specifically comprises the following steps: the stretched PVA film is immersed in a color compensation groove for color compensation, and the color compensation groove liquid comprises 0.1-0.5wt% of boric acid, 4.0-5.0wt% of potassium iodide and 1.5-2.0wt% of iodine.
Preferably, the swelling step includes swelling the washed PVA film in a swelling tank with a stretching ratio of 1-1.5 times.
Preferably, the swelling tank contains 0.35 to 0.6wt% of boric acid aqueous solution.
Preferably, the dyeing step is carried out in an aqueous solution containing 0.5-1.2wt% iodine, 1.5-2.4wt% potassium iodide, and 0.1-0.4wt% boric acid.
Preferably, the stretching ratio of the dyed PVA film in the stretching step is 3.7 to 4.6 times.
The polarizer comprises an outer protective film, a PVA film, an inner protective film, a pressure-sensitive adhesive and a release film which are sequentially bonded from top to bottom, wherein the outer protective film is a scratch-resistant film, the inner protective film is a TAC film, and the PVA film is prepared by a dyeing process of the PVA film for the polarizer.
Compared with the prior art, the invention has the following implementation effects: compared with the common complementary color solution only containing potassium iodide and boric acid, the invention improves the content of potassium iodide and iodine by reducing the content of boric acid, so that the area of uneven dyeing of the stretched PVA film can further absorb iodine and potassium iodide in the complementary color process, thereby promoting I 3 - And I 5 - While reducing the boric acid content, to give I 3 - And I 5 - Can be effectively complexed between PVA molecular chains of PVA film, thereby avoiding I 3 - And I 5 - Complexing with boric acid in the dyeing liquid in a large amount; according to the invention, the color compensation is carried out on the stretched PVA film, the original color compensation solution only containing potassium iodide and boric acid is improved, the iodine simple substance is added into the color compensation solution, the content of potassium iodide and boric acid is changed, the problem of uneven dyeing of the stretched PVA film is solved, dyeing stripes disappear, and meanwhile, the transmittance of the polaroid is improved.
Drawings
FIG. 1 is a photograph of dyed strips of a control example;
FIG. 2 is a photograph of dyed strips of example 1.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Placing the PVA film in a water washing tank at 23 ℃ for water washing for 30s; placing the PVA film after water washing in a swelling tank containing 0.4wt% boric acid water solution at 27 ℃ for swelling treatment for 40s, and stretching for 1.1 times in the swelling process; immersing the PVA film after swelling treatment in a dyeing tank containing an aqueous solution of 0.8wt% of iodine, 1.9wt% of potassium iodide and 0.3wt% of boric acid at 15 ℃ for dyeing; after dyeing treatment, the PVA film is washed by a 12 ℃ cleaning tank, and then enters a 43 ℃ stretching tank containing 3.4wt% boric acid aqueous solution for stretching for 4.1 times; then dipping the stretched PVA film in a color compensation tank at 12 ℃ for 5s, wherein the color compensation tank liquid comprises 0.4wt% of boric acid, 4.3wt% of potassium iodide and 1.8wt% of iodine; finally, the PVA film after the color compensation is cut by water, and then dried at 55 ℃ to obtain the dyed PVA film.
And compounding the TAC film, the scratch-resistant film and the dyed PVA film, respectively compounding the TAC film and the scratch-resistant film on two sides of the PVA film, coating pressure-sensitive adhesive on the surface of the TAC film, compounding a release film on the pressure-sensitive adhesive, drying, detecting and winding the release film to obtain the polarizing film, and cutting the polarizing film to obtain the polarizer.
Example 2
Placing the PVA film in a water washing tank at 25 ℃ for water washing for 30s; placing the PVA film after water washing in a swelling tank containing 0.6wt% boric acid water solution at 28 ℃ for swelling treatment for 30s, and stretching for 1.2 times in the swelling process; immersing the PVA film after swelling treatment in a dyeing tank containing an aqueous solution of 1.2wt% of iodine, 2.4wt% of potassium iodide and 0.4wt% of boric acid at 18 ℃ for dyeing; after dyeing treatment, the PVA film is washed by a washing tank at 15 ℃ and then enters a stretching tank containing 3.6wt% boric acid water solution at 45 ℃ for stretching for 4.5 times; then dipping the stretched PVA film in a 10 ℃ complementary color tank for complementary color for 8s, wherein the complementary color tank liquid comprises 0.5wt% of boric acid, 5.0wt% of potassium iodide and 2.0wt% of iodine; finally, the PVA film after the color compensation is cut by water, and then dried at 50 ℃ to obtain the dyed PVA film.
And compounding the TAC film, the scratch-resistant film and the dyed PVA film, respectively compounding the TAC film and the scratch-resistant film on two sides of the PVA film, coating pressure-sensitive adhesive on the surface of the TAC film, compounding a release film on the pressure-sensitive adhesive, drying, detecting and winding the release film to obtain the polarizing film, and cutting the polarizing film to obtain the polarizer.
Example 3
Placing the PVA film in a water washing tank at 27 ℃ for water washing for 25 seconds; placing the PVA film after water washing in a swelling tank containing 0.35wt% boric acid water solution at 25 ℃ for swelling treatment for 1min, and stretching for 1.4 times in the swelling process; immersing the PVA film after swelling treatment in a dyeing tank containing aqueous solution of 0.5wt% of iodine, 1.5wt% of potassium iodide and 0.1wt% of boric acid at 16 ℃ for dyeing; after dyeing treatment, the PVA film is washed by a 13 ℃ cleaning tank, and then enters a stretching tank containing 3wt% boric acid aqueous solution at 55 ℃ for stretching for 4.4 times; then dipping the stretched PVA film in a color compensation tank at 10 ℃ for 10s, wherein the color compensation tank liquid comprises 0.1wt% of boric acid, 4.0wt% of potassium iodide and 1.5wt% of iodine; finally, the PVA film after the color compensation is cut by water, and then dried at 50 ℃ to obtain the dyed PVA film.
And compounding the TAC film, the scratch-resistant film and the dyed PVA film, respectively compounding the TAC film and the scratch-resistant film on two sides of the PVA film, coating pressure-sensitive adhesive on the surface of the TAC film, compounding a release film on the pressure-sensitive adhesive, drying, detecting and winding the release film to obtain the polarizing film, and cutting the polarizing film to obtain the polarizer.
Comparative example
The difference from example 1 is that the complementary color bath solution comprises 1.4wt% boric acid and 3.5wt% potassium iodide.
The polarizers of example 1 and the comparative example were tested for polarization degree, transmittance, hue and color stripe property, wherein the transmittance and polarization degree were tested using a polarization photometer and the hue value was tested using a konikamata gray scale tester, and the results are shown in the following table:
| example 1 | Comparative example | |
| Polarization degree% | 99.995671 | 99.99634 |
| Transmittance% | 36.787745 | 35.641254 |
| a | -0.87084 | -0.94158 |
| b | 3.12675 | 3.04275 |
The absorption axes (stretching direction of PVA) of the two polaroids are vertically crossed on a backlight module with the luminous intensity of 120cd to observe dyeing stripes, and a high-definition camera is used for photographing, so that the results are shown in the accompanying figures 1 and 2. It is apparent that the polarizer of example 1 has no color stripes, whereas the comparative example has more severe color stripes.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The dyeing process of the PVA film for the polaroid is characterized by comprising the steps of washing the PVA film with water, swelling, dyeing, stretching, complementary color and drying, wherein the complementary color step specifically comprises the following steps: the stretched PVA film is immersed in a color compensation groove for color compensation, and the color compensation groove liquid comprises 0.1-0.5wt% of boric acid, 4.0-5.0wt% of potassium iodide and 1.5-2.0wt% of iodine.
2. The dyeing process of a PVA film for a polarizer according to claim 1, wherein the swelling step comprises swelling the PVA film after washing in a swelling tank, and a stretching ratio of the PVA film during swelling is 1 to 1.5 times.
3. The dyeing process of a PVA film for a polarizer according to claim 2, wherein the swelling tank contains an aqueous solution of boric acid in an amount of 0.35 to 0.6 wt%.
4. The process of dyeing a PVA film for a polarizer according to claim 1, wherein the dyeing step is performed in an aqueous solution containing 0.5 to 1.2wt% of iodine, 1.5 to 2.4wt% of potassium iodide, and 0.1 to 0.4wt% of boric acid.
5. The process of dyeing a PVA film for a polarizer according to claim 1, wherein the stretching ratio of the dyed PVA film in the stretching step is 3.7 to 4.6 times.
6. A polarizer comprising an outer protective film, a PVA film, an inner protective film, a pressure-sensitive adhesive and a release film, which are sequentially bonded from top to bottom, wherein the outer protective film is a scratch-resistant film, the inner protective film is a TAC film, and the PVA film is prepared by the dyeing process of the PVA film for a polarizer according to any one of claims 1 to 5.
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| CN115097561B (en) * | 2022-06-17 | 2024-01-09 | 佛山纬达光电材料股份有限公司 | High-temperature-resistant iodine polarizer and production process thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002236214A (en) * | 2001-02-08 | 2002-08-23 | Nitto Denko Corp | Polarizing film and polarizing plate and liquid crystal display device which uses the same |
| TW200807208A (en) * | 2006-07-26 | 2008-02-01 | Chi Mei Materials Technology Corp | Feedback method of automatic dye detection and apparatus thereof |
| CN209215618U (en) * | 2018-08-16 | 2019-08-06 | 深圳市盛波光电科技有限公司 | A kind of control of optics and the integrated polaroid of cover board defencive function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100958288B1 (en) * | 2007-02-09 | 2010-05-19 | 주식회사 엘지화학 | Iodine-type polarizer, polarizing plate and method for producing thereof |
| CN105518562B (en) * | 2013-09-12 | 2017-10-27 | Lg化学株式会社 | Device for preparing polarizing coating |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002236214A (en) * | 2001-02-08 | 2002-08-23 | Nitto Denko Corp | Polarizing film and polarizing plate and liquid crystal display device which uses the same |
| TW200807208A (en) * | 2006-07-26 | 2008-02-01 | Chi Mei Materials Technology Corp | Feedback method of automatic dye detection and apparatus thereof |
| CN209215618U (en) * | 2018-08-16 | 2019-08-06 | 深圳市盛波光电科技有限公司 | A kind of control of optics and the integrated polaroid of cover board defencive function |
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