CN111025684B - Manufacturing method of polarized PVA film for sunglasses and polarized PVA film - Google Patents
Manufacturing method of polarized PVA film for sunglasses and polarized PVA film Download PDFInfo
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- CN111025684B CN111025684B CN201911409386.0A CN201911409386A CN111025684B CN 111025684 B CN111025684 B CN 111025684B CN 201911409386 A CN201911409386 A CN 201911409386A CN 111025684 B CN111025684 B CN 111025684B
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- pva film
- dye
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- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/12—Polarisers
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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
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- General Health & Medical Sciences (AREA)
- Polarising Elements (AREA)
Abstract
The invention discloses a method for manufacturing a polarizing PVA film for a sunglass, which comprises the following manufacturing processes: PVA film pretreatment, dip dyeing, cleaning, stretching, auxiliary agent treatment, drying and protective film coating. Wherein, in the dip dyeing step, a dichromatic macromolecular dye, a dyeing assistant and a leveling agent are adopted for dip dyeing treatment; in the auxiliary agent treatment step, a softener is adopted for treatment. The polarizing PVA film prepared by the method has the characteristics of high temperature resistance, no color change, no chromatic aberration, softness and easiness in processing. The invention also provides a polarized PVA film.
Description
Technical Field
The invention relates to the technical field of polaroids, in particular to a dye polarizing PVA film for a sunglass, which has the advantages of high temperature resistance, no color change, uniform dyeing, no color difference, softness and easiness in processing, and a preparation method thereof.
Background
The polarized glasses belong to a special sunglass, and the common sunglass lens or dyeing piece only utilizes the light-reducing function and cannot filter light, so that the intensity of glare and ultraviolet light can be reduced, but the glare cannot be completely blocked, namely, the transmittance of light can be reduced, the scenery becomes dark, including the glare, but the scenery under the light glare still cannot be seen clearly, and the influence of the glare cannot be completely eliminated. Compared with the common sunglasses, the polarized lens has the polarized property, and can completely block dazzling glare caused by various factors such as scattering, reflection and the like; meanwhile, the ultraviolet light harmful to the eyes can be completely blocked, so that the eyes are not easy to tire when people move under strong light for a long time, and meanwhile, the light in a dark place can be kept from being excessively weakened, so that the contrast color of an object image is properly restored, the vision is clearer, the landscape color is richer, the object image is more real, the real protection function is achieved, and the glasses are suitable for various environments and are worn for a long time.
In the conventional polarizing glasses, most of PVA films having a polarizing function are dyed using iodine as a dichroic material, and iodine is easily sublimated at a high temperature, so that there are disadvantages of poor heat resistance and light resistance, and the use scenes and the service lives of the polarizing glasses are limited. Meanwhile, the iodine-based polarizing film is prone to generate chromatic aberration and color shift due to high temperature in the injection molding or bending process of sunglasses processing, so that the quality of polarized sunglasses is affected.
In addition, in the conventional polarizer production process, most of the PVA polarizing films are brittle, or become brittle after being dried, so that the PVA polarizing films are difficult to store, and are difficult to directly use in sunglasses production. Therefore, the polarizer is mostly produced by adhering triacetylcellulose to the upper layer and the lower layer of the PVA polarizing film by using an adhesive for protection, the triacetylcellulose film is adhered to the lens by the adhesive in the production process of the sunglasses, the polarizer needs to be bent to form a certain radian, and the delamination phenomenon often occurs, so that the polarizer with the protective layer triacetylcellulose has adverse effect on the production of the sunglasses.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide a method for manufacturing a polarized PVA film which is high-temperature resistant, does not have a cellulose triacetate layer and can be directly used for manufacturing sunglasses.
In order to achieve the purpose, the invention adopts the following technical scheme.
A method for manufacturing a polarizing PVA film for a sunglass, comprising the steps of: 1) PVA film pretreatment: soaking the PVA film in a first solution tank rinsing bath for rinsing, and then entering a second solution tank swelling bath for treatment after rinsing is finished, so that the PVA is easy to dye and stretch; 2) dip dyeing: dyeing the pretreated PVA film in a third dye solution tank, and adding a dye, a leveling agent and a dyeing assistant in the third dye solution tank, wherein the dye is a dichroic dye; 3) cleaning: washing the dyed PVA film in a fourth pure water tank; 4) stretching: carrying out cross-linking curing on the PVA film subjected to dip-dyeing treatment through a fifth solution tank, and simultaneously stretching; 5) processing an auxiliary agent: performing functionalization treatment on the PVA film subjected to dyeing and stretching treatment through a sixth auxiliary agent groove, and adding a softener into the sixth auxiliary agent groove; 6) and (3) drying: washing the PVA film after the treatment with pure water, and drying in an oven; 7) pasting a protective film: and (5) pasting protective films on the two sides of the dried polarizing film.
More preferably, in the step 1), the boric acid concentration in the swelling tank of the second solution tank is 0 to 3% by weight.
More preferably, in the step 2), the concentration of the dye is 0.01-5 wt%, and the concentrations of the leveling agent and the dyeing assistant are both 0.1-1.5 wt%.
More preferably, the dye is one dye or a mixture of dyes.
More preferably, in step 3), the fourth pure water tank is used for washing away the floating color on the surface of the dyed PVA film, and the dye concentration in the fourth pure water tank is not more than 0.01 wt%.
More preferably, in the step 4), the concentration of boric acid in the fifth solution tank is 1% to 2.5% by weight
More preferably, in the step 5), the concentration of each auxiliary agent in the sixth auxiliary agent tank is 0.1-1 wt%.
More preferably, in step 6), the drying temperature of the PVA film is 30-80 DEG C
More preferably, in step 7), the protective film is a polyethylene protective film, and the adhesive force of the protective film ranges from 6 to 20gf/25 mm.
A polarizing PVA film is characterized by being produced by the above-described production method.
The invention has the beneficial effects that:
the method is characterized in that a dichroic macromolecular dye is adopted to dye a PVA film, the molecular structure of the dichroic macromolecular dye is large, cannot be sublimated, and is high-temperature-resistant, high-humidity-resistant and non-color-changing, so that polarized glasses produced by the method are high-temperature-resistant, high-humidity-resistant and non-color-changing, the quality is stable in the processing process, and the service life is long.
Secondly, dye, leveling agent and dyeing assistant are added into a third dye solution tank. The dye-philic leveling agent is used as the leveling agent, the affinity of the leveling agent to the dye is greater than that of the dye to the fiber, the dye is firstly pulled by the leveling agent before the dye is adsorbed by the fiber and then combined to generate a certain stable aggregate, and the dye can be combined with the fiber only by being separated from the leveling agent, so that the dye migration rate and the diffusion speed are reduced, and the dyeing time is prolonged. At high temperature, the stable aggregate contacts with the fiber to generate decomposition, then releases the dye, and combines the dye and the fiber, thereby effectively enhancing the dyeing uniformity of the PVA film, eliminating color difference and achieving the purpose of level dyeing. The dyeing assistant mainly has the functions of increasing the dyeing rate and increasing the dyeing rate of the dye, and anhydrous sodium sulphate, sulfuric acid, salt and glacial acetic acid can be generally used. Through the combined action of the dyeing assistant and the leveling agent, the PVA film is dyed efficiently and uniformly without color difference, and the use requirements of sunglasses are met.
And thirdly, a softener is added into the sixth auxiliary agent groove, the softener is a layer of protective film uniformly arranged on the surface of the PVA fiber, the surface of the PVA fiber absorbs the softener, the friction coefficient between the PVA fibers is reduced, and the mobility is enhanced, so that the PVA film becomes softer and more elastic, the elasticity of the product can be kept for a long time after the product is dried, and the processing is convenient.
Fourthly, the protective film can be directly made of polyethylene protective film, and the protective film can be directly used for processing sunglasses after being torn off; compared with the prior art, the thickness of the polarizer can be greatly reduced without a cellulose triacetate protective layer, and the selection space of lens materials in the production process of the sunglasses is also improved.
Detailed Description
The following further describes the embodiments of the present invention, so that the technical solutions and the advantages thereof of the present invention are more clear and definite. The following description of the embodiments is exemplary in nature and is in no way intended to limit the invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
A method for manufacturing a polarizing PVA film for a sunglass, comprising the steps of:
1) PVA film pretreatment: and soaking the PVA film in a first solution tank rinsing bath for rinsing, and after the rinsing is finished, entering a second solution tank swelling bath for treatment, so that the PVA film is easy to dye and stretch.
2) Dip dyeing: and (4) dyeing the pretreated PVA film in a third dye solution tank.
3) Cleaning: and washing the dyed PVA film in a fourth pure water tank.
4) Stretching: and (3) carrying out cross-linking and curing on the PVA film subjected to the dip-dyeing treatment through a fifth solution tank, and simultaneously stretching.
5) Processing an auxiliary agent: and (4) carrying out functional treatment on the PVA film subjected to dyeing and stretching treatment through a sixth auxiliary agent groove.
6) And (3) drying: the treated PVA film was washed with pure water and dried in an oven.
7) Pasting a protective film: and (3) coating protective films on the two sides of the dried polarizing film to obtain the dye polarizing film which can be used for manufacturing sunglasses.
Wherein, in the second solution tank, the concentration of the boric acid is 0-3%. The third dye solution tank uses macromolecular dye as dichroic material, which is usually formed by azo dye, azo dye and leek dye, and in this embodiment, the third dye solution tank preferably uses azo dye, the dye concentration is 0.01% -5%, and the third dye solution tank further includes leveling agent and dyeing assistant agent of 0.1% -1.5%. One or more different dyes can be added into the dye solution tank according to the different required color phases of the polarizing films. The dyeing assistant mainly has the functions of increasing the dyeing rate and increasing the dyeing rate of the dye, and anhydrous sodium sulphate, sulfuric acid, salt and glacial acetic acid can be generally used. The dye leveling agent is usually a dye-philic leveling agent, the affinity of the dye leveling agent to the dye is greater than that of the dye to the fiber, the dye leveling agent firstly holds the dye before the dye is adsorbed by the fiber and then is combined to generate a certain stable aggregate, and the dye can be combined with the fiber only by separating from the dye leveling agent, so that the dye migration rate and the diffusion speed are reduced, and the dyeing time is prolonged. At high temperature, the stable aggregate contacts with fiber to produce decomposition, and then releases dye to combine with fiber, so as to achieve the purpose of level dyeing. Through the combined action of the dyeing assistant and the leveling agent, the PVA film is efficiently and uniformly dyed, and the use requirements of sunglasses are met.
The cleaning process comprises the following steps: the surface of the PVA film after dip dyeing is washed away with the floating color and the auxiliary agent by using pure water, and in order to avoid the phenomenon that the high concentration of liquid in a washing tank influences the hue of the PVA polarizing film and causes color difference, the concentration of the dye in the solution needs to be controlled to be lower than 0.01 percent.
The stretching process comprises the following steps: the PVA is stretched 4 to 6 times in boric acid solution with the concentration of 1 to 2.5 percent at the temperature of between 35 and 65 ℃.
The processing process of the auxiliary agent comprises the following steps: and (3) performing functionalization treatment on the protective film subjected to dyeing and stretching treatment by an aid tank added with a softener, a water-resistant agent and an ultraviolet absorbent. The softener is a layer of protective film uniformly arranged on the surface of the PVA fiber, the surface of the PVA fiber absorbs the softener, the friction coefficient between the PVA fibers is reduced, and the mobility is enhanced, so that the PVA film becomes softer and more elastic, the elasticity of the product can be kept for a long time after the product is dried, and the processing is convenient. The addition of the water-resistant agent can improve the humidity and temperature resistance effect of the PVA film, and the ultraviolet absorbent can enhance the filtering capacity of the polarizer made of the polarizing film to ultraviolet rays.
Drying the dyed, stretched and assistant-treated PVA film in an oven, and then pasting polyethylene protective films on two sides of the PVA film to prepare the dye polarized PVA film for the high-durability sunglasses, wherein the temperature of the oven is 30-80 ℃ in order to ensure the softness of the film; for better preservation, the adhesion force of the polyethylene protective film is 6-20gf/25mm, so as to achieve the effect of isolating water vapor.
It will be appreciated by those skilled in the art from the foregoing description of construction and principles that the invention is not limited to the specific embodiments described above, and that modifications and substitutions based on the teachings of the art may be made without departing from the scope of the invention as defined by the appended claims and their equivalents. The details not described in the detailed description are prior art or common general knowledge.
Claims (7)
1. A method for manufacturing a polarizing PVA film for a sunglass, which is characterized by comprising the following steps:
1) PVA film pretreatment: soaking the PVA film in a first solution tank rinsing bath for rinsing, and then entering a second solution tank swelling bath for treatment after rinsing is finished, so that the PVA is easy to dye and stretch;
2) dip dyeing: dyeing the pretreated PVA film in a third dye solution tank, and adding a dye, a leveling agent and a dyeing assistant in the third dye solution tank, wherein the dye is a dichroic dye;
3) cleaning: washing the dyed PVA film in a fourth pure water tank;
4) stretching: carrying out cross-linking curing on the PVA film subjected to dip-dyeing treatment through a fifth solution tank, and simultaneously stretching;
5) processing an auxiliary agent: performing functionalization treatment on the PVA film subjected to dyeing and stretching treatment through a sixth auxiliary agent groove, and adding a softener into the sixth auxiliary agent groove; the concentration of each auxiliary agent in the sixth auxiliary agent groove is 0.1-1 wt%;
6) and (3) drying: washing the PVA film after the treatment with pure water, and drying in an oven;
7) pasting a protective film: sticking protective films to two sides of the dried polarizing film, wherein the protective films are polyethylene protective films, and the adhesive force range of the protective films is 6-20gf/25 mm; when in use, the protective film is torn off and is directly used for processing sunglasses.
2. The method for manufacturing a polarizing PVA film for a sunglass according to claim 1, wherein in step 1), the boric acid concentration in the swelling bath of the second solution bath is 0 to 3% by weight.
3. The method for manufacturing a polarizing PVA film for a sunglass according to claim 1, wherein in step 2), the concentration of the dye is 0.01% to 5% by weight, and the concentrations of the leveling agent and the dyeing assistant are both 0.1% to 1.5% by weight.
4. The method of claim 1, wherein the dye is one dye or a mixture of dyes.
5. The method of claim 1, wherein in step 3), the fourth pure water tank is used to wash away the floating color on the surface of the dyed PVA film, and the dye concentration in the fourth pure water tank is not more than 0.01 wt%.
6. The method for manufacturing a polarizing PVA film for a sunglass according to claim 1, wherein in step 4), the boric acid concentration in the fifth solution tank is 1% to 2.5% by weight.
7. The method for manufacturing a polarizing PVA film for a solar mirror according to claim 1, wherein in step 6), the drying temperature of the PVA film is 30 to 80 ℃.
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| CN201911409386.0A CN111025684B (en) | 2019-12-31 | 2019-12-31 | Manufacturing method of polarized PVA film for sunglasses and polarized PVA film |
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| CN201911409386.0A CN111025684B (en) | 2019-12-31 | 2019-12-31 | Manufacturing method of polarized PVA film for sunglasses and polarized PVA film |
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| CN111025684A CN111025684A (en) | 2020-04-17 |
| CN111025684B true CN111025684B (en) | 2021-06-25 |
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|---|---|---|---|---|
| CN101852879A (en) * | 2009-03-30 | 2010-10-06 | 住友化学株式会社 | The manufacture method of light polarizing film |
| CN103278877A (en) * | 2013-06-15 | 2013-09-04 | 佛山纬达光电材料有限公司 | Method for manufacturing high-temperature resistant polarizer |
| CN105824073A (en) * | 2015-01-27 | 2016-08-03 | Lg化学株式会社 | Method for manufacturing polarizing plate and polarizing plate manufactured by the same |
| CN107065056A (en) * | 2017-01-22 | 2017-08-18 | 华侨大学 | A kind of preparation method of scratch resistance graphene polaroid |
| CN108957616A (en) * | 2018-09-11 | 2018-12-07 | 深圳市盛波光电科技有限公司 | A kind of manufacturing method of dye-type polaroid |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7573637B2 (en) * | 2004-08-03 | 2009-08-11 | Seiko Epson Corporation | Intrinsic polarizer and method of manufacturing an intrinsic polarizer |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852879A (en) * | 2009-03-30 | 2010-10-06 | 住友化学株式会社 | The manufacture method of light polarizing film |
| CN103278877A (en) * | 2013-06-15 | 2013-09-04 | 佛山纬达光电材料有限公司 | Method for manufacturing high-temperature resistant polarizer |
| CN105824073A (en) * | 2015-01-27 | 2016-08-03 | Lg化学株式会社 | Method for manufacturing polarizing plate and polarizing plate manufactured by the same |
| CN107065056A (en) * | 2017-01-22 | 2017-08-18 | 华侨大学 | A kind of preparation method of scratch resistance graphene polaroid |
| CN108957616A (en) * | 2018-09-11 | 2018-12-07 | 深圳市盛波光电科技有限公司 | A kind of manufacturing method of dye-type polaroid |
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