CN105223639B - The preparation method of slim Pva Polarizing Film - Google Patents
The preparation method of slim Pva Polarizing Film Download PDFInfo
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- CN105223639B CN105223639B CN201510784075.8A CN201510784075A CN105223639B CN 105223639 B CN105223639 B CN 105223639B CN 201510784075 A CN201510784075 A CN 201510784075A CN 105223639 B CN105223639 B CN 105223639B
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- polarizing film
- thermoplastic resin
- pva polarizing
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- resin substrate
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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
Abstract
The invention discloses a kind of preparation methods of slim Pva Polarizing Film, preheat thermoplastic resin substrate before forming laminated body；The present invention uses the formation polyvinyl alcohol layer on the substrate of preheating to obtain laminated body, avoid laminated body drying process polyvinyl alcohol film unbalanced stress, molding light polarizing film is enabled to be easy to remove from substrate, the problems such as being not in curling caused by stress is uneven in stripping process, uniform film can be obtained after dry, stretching, and it can guarantee the superperformance of light polarizing film itself, that is, there is uniform strength characteristics, and have the advantages that degree of polarization and light transmittance are high.
Description
Technical field
The present invention relates to a kind of preparation methods of polyvinyl alcohol film, and in particular to a kind of slim Pva Polarizing Film
Preparation method.
Background technique
It is penetrated with light and the polaroid of screening performance is the underlying dimension of liquid crystal display (LCD), answered extensively
For showing equipment, such as liquid crystal display and organic light emitting diode, in recent years, and as liquid crystal display is thinned increasingly, polarisation
Piece also requires thinner thickness, and the manufacturing method as slim polaroid, more universal use will have thermoplasticity
The laminated body of resin base material and polyvinyl alcohol (abbreviation PVA) resin stretches, and carries out dyeing processing then so as to set
Light polarizing film is formed on aliphatic radical material；In the method be usually stretch form light polarizing film after need to dye after PVA film from
It is removed on resin base material, since substrate passes through together with intermolecular force or adhesive attachment between PVA film, after stretching
Be not easily stripped or stripping process in the problems such as crimping；Meanwhile such as PVA layers of damage or substrate can occur in stripping process
PVA layer defects caused by deforming, so that the optical property (such as degree of polarization) of final PVA light polarizing film deteriorates.
Therefore, it is necessary to a kind of polyvinyl alcohol film preparation processes, and molding light polarizing film is enabled to be easy to shell from substrate
From, and can guarantee the superperformance of light polarizing film itself, that is, have uniform strength characteristics and degree of polarization and light transmittance high
Advantage.
Summary of the invention
In view of this, being enabled into it is an object of the invention to provide a kind of preparation method of slim Pva Polarizing Film
The light polarizing film of type is easy to remove from substrate, and can guarantee the superperformance of light polarizing film itself, that is, has uniform intensity
Characteristic, and have the advantages that degree of polarization and light transmittance are high.
The preparation method of slim Pva Polarizing Film of the invention, including the following steps:
A. thermoplastic resin substrate is preheated；
B. polyvinyl alcohol layer is formed on thermoplastic resin substrate and is dried to obtain laminated body；
C. the laminated body of step b stretched, dyeing, dry and remove molding Pva Polarizing Film from substrate.
Further, further include the following steps:
D. dye liquor will be sprayed on the Pva Polarizing Film removed from thermoplastic resin substrate and the one side of substrate attachment,
Pva Polarizing Film is dried；
Further, thermoplastic resin substrate is made of linear polyphenylene sulfide resin, the crystallinity of non-stretched preceding polyphenylene sulfide
It is 10% or less；
Further, the surface that thermoplastic resin substrate is used to form laminated body is processed by shot blasting that surface roughness is lower than
0.05μm；
Further, in step a, thermoplastic resin substrate preheating temperature is 40 DEG C -80 DEG C；
Further, before the thermoplastic matrix stretches with a thickness of 30 μm -300 μm；
Further, the polyvinyl alcohol degree of polymerization is 1500-6000, and saponification degree is 99mol% or more；
Further, in step b, before the polyvinyl alcohol film stretching with a thickness of 10-30 μm, stretching ratio is 4 times or more,
Draft temperature is 60 DEG C -120 DEG C；
Further, step b, in c, d, drying temperature is 70 DEG C -120 DEG C；
Further, in step d, the quantity for spray of the dye liquor of spraying is 0.1ml/min-10ml/min, spray time 10s-
30s。
Beneficial effects of the present invention: the preparation method of slim Pva Polarizing Film of the invention, using the base in preheating
Polyvinyl alcohol layer is formed on material and obtains laminated body, is avoided laminated body drying process polyvinyl alcohol film unbalanced stress, is enabled to
The problems such as molding light polarizing film is easy to remove from substrate, is not in curling caused by stress is uneven in stripping process,
Uniform film can be obtained after dry, stretching, and can guarantee the superperformance of light polarizing film itself, that is, is had uniform strong
Characteristic is spent, and has the advantages that degree of polarization and light transmittance are high.
Specific embodiment
The preparation method of slim Pva Polarizing Film of the invention, including the following steps:
A. thermoplastic resin substrate is preheated；
B. polyvinyl alcohol layer is formed on thermoplastic resin substrate and is dried to obtain laminated body；The formation of laminated body can be used
Method of existing any suitable, such as cast coat, film by wet, melting extrusion, casting film etc., preferably in thermoplastic matrix
Material coating includes the coating fluid of PVA system resin and is formed；Coating fluid is made of making the dissolution in a solvent of above-mentioned PVA system resin
Solution, can for example be enumerated as solvent dimethyl sulfoxide, dimethylformamide, dimethyl acetamide, ethylene glycol, propylene glycol,
Trimethylolpropane, glycerol, water etc., preferably water；Polyvinyl alcohol (PVA) resin concentration of solution is relative to 100 parts by weight solution
It is preferred that 10-30 parts by weight；Above-mentioned coating fluid, for uniformity, dyeability, the draftability for improving polyvinyl alcohol resin layer, Ke Yijia
Enter additive, as additive, plasticizer, surfactant etc. can be added；As plasticizer, ethylene glycol, glycerol can be added
Equal polyalcohols；As surfactant, it is living that nonionic surfactant, cationic surfactant or anionic surface can be added
Property agent, preferred nonionic surfactants and anionic surfactant；
C. the laminated body of step b is dried into post-tensioning, dyeing, drying and shells molding Pva Polarizing Film from substrate
From.
Further include the following steps in the present embodiment:
D. dye liquor will be sprayed on the Pva Polarizing Film removed from thermoplastic resin substrate and the one side of substrate attachment,
Pva Polarizing Film is dried；It avoids being the PVA by outer and interior absorption, with substrate coupling part due to dichroic substance
Because of the barrier of substrate, the poor grade of adsorption effect is caused to be caused after stretching film in entire film thickness direction there are concentration difference
PVA polaring film color is uneven, and the poor problem of optical property ensure that polarisation film thickness direction even dyeing.
In the present embodiment, thermoplastic resin substrate is made of linear polyphenylene sulfide resin, the knot of non-stretched preceding polyphenylene sulfide
Brilliant degree is 10% or less；8% is more preferably hereinafter, crystallinity can for example be adjusted by importing modified group to constituent material
It is whole.
In the present embodiment, the surface that thermoplastic resin substrate is used to form laminated body is processed by shot blasting, surface roughness
Lower than 0.05 μm；Preferably 0.025 μm or less；If roughness is higher than 0.05 μm, substrate and conforming to property of polyvinyl alcohol film
Difference, when stretching, can be easily separated, and by controlling the roughness of substrate surface, in conjunction with the heat treatment of substrate, being further ensured that can make
Molding light polarizing film is obtained to be easy to remove from substrate.
In the present embodiment, in step a, thermoplastic resin substrate preheating temperature is 40 DEG C -80 DEG C.
In the present embodiment, the thermoplastic matrix stretch before with a thickness of 30 μm -300 μm；When thickness is lower than 30 μm, poly- second
The formation of enol resin layer becomes difficult, and when more than 300 μm, when stretching needs excessive load, consumes the more energy and to setting
It is standby more demanding, and be not easy to control.
In the present embodiment, the polyvinyl alcohol degree of polymerization is 1500-6000, and saponification degree is 99mol% or more, preferably
99.5mol% or more.
In the present embodiment, in step b, before the polyvinyl alcohol film stretching with a thickness of 10-30 μm, be lower than 10 μm, gained
Slim light polarizing film optical characteristics reduce；Stretching ratio is 4 times or more, and preferably 6 times or more, extension ratio, can not less than 4 times
Obtain sufficient polarizing properties or endurance quality；Draft temperature is 60 DEG C -120 DEG C.
In the present embodiment, step b, in c, d, drying temperature is 70 DEG C -120 DEG C；Drying time 30s-600s；
In the present embodiment, in step d, the quantity for spray of the dye liquor of spraying is 0.1ml/min-10ml/min, and spray time is
10s-30s, general spraying 1-2 times；Spraying dye liquor used is iodine solution, and relative to 100 weight waters, the proportion of iodine is 0.1-10 mass
Part iodine, 0.1-30 mass parts potassium iodide.
The following are a specific embodiment of the invention, in following embodiment, the parts by weight unit of raw material can for gram or
Kilogram, unit is unified if without special mark:
Embodiment one
The preparation method of the slim Pva Polarizing Film of the present embodiment, including the following steps:
A. thermoplastic resin substrate is preheated, the linear polyphenylene sulfide resin that thermoplastic resin substrate is 10% by crystallinity
It constitutes, preheating temperature is 40 DEG C, and thermoplastic matrix is with a thickness of 30 μm；
B. on thermoplastic resin substrate forming polyvinyl alcohol layer by the way of coating and at 70 DEG C at a temperature of is dry
To laminated body, the surface that thermoplastic resin substrate is used to form laminated body is processed by shot blasting, surface roughness is 0.05 μm；It applies
Cloth liquid is water, and solution concentration is 10 parts of polyvinyl alcohol (PVA) in 100 parts by weight solution, also added plasticizer second two in solution
Alcohol；The polyvinyl alcohol degree of polymerization is 1500, saponification degree 99mol%；The laminated body polyvinyl alcohol film of formation is with a thickness of 10 μm；
C. the laminated body of step b dried into post-tensioning, dyeing, dried at a temperature of 70 DEG C and molding polyvinyl alcohol is inclined
Light film is removed from substrate；Stretching ratio is 4 times, and draft temperature is 60 DEG C；
D. dye liquor will be sprayed on the Pva Polarizing Film removed from thermoplastic resin substrate and the one side of substrate attachment,
Pva Polarizing Film is dried at a temperature of 70 DEG C, obtains final light polarizing film product；The quantity for spray of the dye liquor of spraying is
0.1ml/min, spray time 30s；Spraying dye liquor used is iodine solution, and relative to 100 weight waters, the proportion of iodine is 0.1 weight
Part iodine, 0.1 part by weight of potassium iodide.
Embodiment two
The preparation method of the slim Pva Polarizing Film of the present embodiment, including the following steps:
Include the following steps:
A. thermoplastic resin substrate is preheated, the linear polyphenylene sulfide resin that thermoplastic resin substrate is 8% by crystallinity
It constitutes, preheating temperature is 60 DEG C, and thermoplastic matrix is with a thickness of 150 μm；
B. on thermoplastic resin substrate forming polyvinyl alcohol layer by the way of coating and at 90 DEG C at a temperature of is dry
To laminated body, the surface that thermoplastic resin substrate is used to form laminated body is processed by shot blasting, surface roughness is 0.03 μm；It applies
Cloth liquid is water, and solution concentration is 20 parts of polyvinyl alcohol (PVA) in 100 parts by weight solution, also added plasticizer glycerol in solution；
The polyvinyl alcohol degree of polymerization is 3800, saponification degree 99.5mol%；The laminated body polyvinyl alcohol film of formation is with a thickness of 21 μm；
C. the laminated body of step b dried into post-tensioning, dyeing, dried at a temperature of 90 DEG C and molding polyvinyl alcohol is inclined
Light film is removed from substrate；Stretching ratio is 6 times, and draft temperature is 85 DEG C；
D. dye liquor will be sprayed on the Pva Polarizing Film removed from thermoplastic resin substrate and the one side of substrate attachment,
Pva Polarizing Film is dried at a temperature of 90 DEG C, obtains final light polarizing film product；The quantity for spray of the dye liquor of spraying is
6ml/min, spray time 20s；Spraying dye liquor used is iodine solution, relative to 100 weight waters, the proportion of iodine be 6 parts by weight iodine,
21 part by weight of potassium iodide.
Embodiment three
The preparation method of the slim Pva Polarizing Film of the present embodiment, including the following steps:
Include the following steps:
A. thermoplastic resin substrate is preheated, the linear polyphenylene sulfide resin that thermoplastic resin substrate is 8% by crystallinity
It constitutes, preheating temperature is 80 DEG C, and thermoplastic matrix is with a thickness of 300 μm；
B. on thermoplastic resin substrate forming polyvinyl alcohol layer by the way of coating and at 120 DEG C at a temperature of is dry
To laminated body, the surface that thermoplastic resin substrate is used to form laminated body is processed by shot blasting, surface roughness is 0.02 μm；It applies
Cloth liquid is water, and solution concentration is 30 parts of polyvinyl alcohol (PVA) in 100 parts by weight solution, also added plasticizer glycerol in solution；
The polyvinyl alcohol degree of polymerization is 6000, saponification degree 99.5mol%；The laminated body polyvinyl alcohol film of formation is with a thickness of 30 μm；
C. by the laminated body of step b dry post-tensioning, dyeing, dry at a temperature of 120 DEG C and by molding polyvinyl alcohol
Light polarizing film is removed from substrate；Stretching ratio is 6 times, and draft temperature is 120 DEG C；
D. dye liquor will be sprayed on the Pva Polarizing Film removed from thermoplastic resin substrate and the one side of substrate attachment,
Pva Polarizing Film is dried at a temperature of 120 DEG C, obtains final light polarizing film product；The quantity for spray of the dye liquor of spraying is
10ml/min, spray time 10s；Spraying dye liquor used is iodine solution, and relative to 100 weight waters, the proportion of iodine is 10 parts by weight
Iodine, 30 part by weight of potassium iodide.
It is comparative example below:
Comparative example one
The polyphenylene sulfide that crystallinity is 35% is prepared into the base film with a thickness of 50 μm, surface polishing treatment makes coarse
Degree reaches 0.025 μm, and the PVA aqueous solution with 3000 degree of polymerization and 99.9% alcoholysis degree is applied to the one of resin base material
Surface and the dry PVA resin to formation with 15 μ m thicks at 75 DEG C, therefore generate laminated body；Drawing process
Same above-described embodiment is broken in substrate drawing process.
Comparative example two
The polyphenylene sulfide that crystallinity is 8% is prepared into the base film with a thickness of 100 μm, surface polishing treatment makes coarse
Degree reaches 0.2 μm, and the PVA aqueous solution with 4600 degree of polymerization and 99.9% alcoholysis degree is applied to a table of resin base material
Face and the dry PVA resin to formation with 15 μ m thicks at 75 DEG C, therefore generate laminated body.Laminated body stretches
PVA film is peeled away with base material part in the process.
Comparative example three
Processing compound is identical as embodiment two, does not have step d only.
To PVA light polarizing film made by Examples and Comparative Examples, its optical property is evaluated using the following method, is as a result distinguished
It is shown in table 1.
(1) transmitance
In the central location of the width direction of light polarizing film, the polarisation membrane sample of about 4cm*4cm is cut, spectrophotometer is used
(Japanese Shimadzu UV-2200 type, attached integrating sphere) carries out the visible light region of illuminant-C, 2 ° of visuals field according to JIS Z870 benchmark
Visibility correction, transmitance (Y) is found out by 45 ° of the extensions axis direction of opposite light polarizing film and the average value in -45 ° of directions
(2) degree of polarization
With above-mentioned spectrophotometric determination: when 2 identical polarizers of measurement are overlapped first in the parallel mode of polarizing axis
Transmitance, i.e., parallel transmitance Y ∥, with the transmitance that the orthogonal mode of polarizing axis is overlapped, i.e., orthogonal transmitance Y ⊥, according to
Following formula finds out degree of polarization V.
V={ (Y ∥-Y ⊥)/(Y ∥+Y ⊥) } 1/2*100
1 optical performance test result of table
Compared by above embodiments and comparative example it is found that being substantially better than the work of the prior art by light polarizing film prepared by the present invention
Skill.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (7)
1. a kind of preparation method of slim Pva Polarizing Film, it is characterised in that: include the following steps:
A. thermoplastic resin substrate is preheated；Thermoplastic resin substrate preheating temperature is 40 DEG C -80 DEG C；
B. polyvinyl alcohol layer is formed on thermoplastic resin substrate and is dried to obtain laminated body；
C. the laminated body of step b stretched, dyeing, dry and shell molding Pva Polarizing Film from thermoplastic resin substrate
From；
D. it will be sprayed in one side that the Pva Polarizing Film removed from thermoplastic resin substrate adheres to thermoplastic resin substrate
Dye liquor is applied, Pva Polarizing Film is dried；
The surface that thermoplastic resin substrate is used to form laminated body is processed by shot blasting that surface roughness is lower than 0.05 μm.
2. the preparation method of slim Pva Polarizing Film according to claim 1, it is characterised in that: thermoplastic resin-based
Material is made of linear polyphenylene sulfide resin, and the crystallinity of non-stretched preceding polyphenylene sulfide is 10% or less.
3. the preparation method of slim Pva Polarizing Film according to claim 1, it is characterised in that: the thermoplastic matrix
Material stretch before with a thickness of 30 μm -300 μm.
4. the preparation method of slim Pva Polarizing Film according to claim 1, it is characterised in that: polyvinyl alcohol polymerization
Degree is 1500-6000, and saponification degree is 99mol% or more.
5. the preparation method of slim Pva Polarizing Film according to claim 1, it is characterised in that: described in step c
Before polyvinyl alcohol film stretching with a thickness of 10-30 μm, stretching ratio is 4 times or more, and draft temperature is 60 DEG C -120 DEG C.
6. the preparation method of slim Pva Polarizing Film according to claim 1, it is characterised in that: step b, in c, d,
Drying temperature is 70 DEG C -120 DEG C.
7. the preparation method of slim Pva Polarizing Film according to claim 1, it is characterised in that: in step d, spraying
Dye liquor quantity for spray be 0.1ml/min-10ml/min, spray time 10s-30s.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1352750A (en) * | 1999-04-21 | 2002-06-05 | 日石三菱株式会社 | Optical laminate |
| CN103201656A (en) * | 2010-11-10 | 2013-07-10 | 住友化学株式会社 | Methods for producing polarizing laminate film and polarizing plate |
| CN103675979A (en) * | 2012-08-28 | 2014-03-26 | 日东电工株式会社 | Method of manufacturing polarizing plate |
| CN105026964A (en) * | 2013-02-15 | 2015-11-04 | 日东电工株式会社 | Method for producing polarizing film |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5563413B2 (en) * | 2010-09-07 | 2014-07-30 | 日東電工株式会社 | Manufacturing method of thin polarizing film |
| JP6109862B2 (en) * | 2014-07-16 | 2017-04-05 | 日東電工株式会社 | Manufacturing method of laminate |
-
2015
- 2015-11-16 CN CN201510784075.8A patent/CN105223639B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1352750A (en) * | 1999-04-21 | 2002-06-05 | 日石三菱株式会社 | Optical laminate |
| CN103201656A (en) * | 2010-11-10 | 2013-07-10 | 住友化学株式会社 | Methods for producing polarizing laminate film and polarizing plate |
| CN103675979A (en) * | 2012-08-28 | 2014-03-26 | 日东电工株式会社 | Method of manufacturing polarizing plate |
| CN105026964A (en) * | 2013-02-15 | 2015-11-04 | 日东电工株式会社 | Method for producing polarizing film |
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