CN107286543A - A kind of polyvinyl alcohol optical film and preparation method thereof - Google Patents
A kind of polyvinyl alcohol optical film and preparation method thereof Download PDFInfo
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- CN107286543A CN107286543A CN201710392188.2A CN201710392188A CN107286543A CN 107286543 A CN107286543 A CN 107286543A CN 201710392188 A CN201710392188 A CN 201710392188A CN 107286543 A CN107286543 A CN 107286543A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/52—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Nonlinear Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Health & Medical Sciences (AREA)
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Abstract
The invention discloses a kind of polyvinyl alcohol optical film and preparation method thereof, prepared using polyvinyl alcohol, plasticizer, water, antioxidant and surfactant, along the length direction of film, the angle that the coarse part of the section of thin-film width edge cutting portion is formed is obtuse angle, and the relief height of section is less than or equal to 100 μm.The polyvinyl alcohol optical film of the present invention section is smooth, intensity is good, super drawing can be prevented to be broken, and preparation method is simple.
Description
Technical field
The present invention relates to a kind of composition of high-molecular compound, and in particular to a kind of polyvinyl alcohol optical film and its preparation
Method.
Background technology
Polyethenol series (PVA) optical film be make liquid crystal display (LCD) key component --- polaroid it is important
Raw material, is one of PVA downstreams high-end applications field.LCD application field is from miniature instruments such as initial calculator, instrumentations
Develop into current mobile phone, flat board, computer, LCD TV, color liquid crystal projecting apparatus, LCD monitor, video camera, vehicle mounted guidance
System etc., application constantly expands, and demand is continuously increased, and the production efficiency and row yielding to polaroid require also higher,
Therefore the PVA optical films of higher quality are needed, meets the processing request of polaroid.
Generally, PVA optical films are, using polyvinyl alcohol as primary raw material, to be aided with the preparation of the auxiliary agents such as plasticizer, surfactant
Into film stoste, be cast or be coated on steel band or roller, through dry etc. process be made；And polaroid is with PVA optics
Film is counterdie or basement membrane, is made by techniques such as washing, swelling, dyeing, stretching, fixation, dryings.Current PVA optical films
During for preparing polaroid, it is easily broken off in super drawing, causes the loss of raw material big, row yielding and production is imitated
Rate is low, and use cost is high.Present invention seek to address that the problem of above-mentioned super drawing is present.
The content of the invention
It is an object of the invention to provide a kind of polyvinyl alcohol optical film, the section of polyvinyl alcohol optical film of the invention
Smoothly, intensity is good, can prevent from being broken during super drawing；Above-mentioned polyethylene is prepared it is a further object of the present invention to provide one kind
The method of alcohol optical film, simple to operate using the preparation method, the polyvinyl alcohol optical film super drawing performance of preparation is good.
To reach above-mentioned purpose, base case of the invention is as follows：
A kind of polyvinyl alcohol optical film, is prepared using polyvinyl alcohol, plasticizer, water, antioxidant and releasing agent, along film
Length direction, the angle that the coarse part of the section of thin-film width edge cutting portion is formed is obtuse angle, and section rises
Volt height is less than or equal to 100 μm.
This programme has the following advantages that：The inventor of this programme has found, thin when optical film meets the length direction along film
The angle that the coarse part of the section of film widthwise edges cutting portion is formed be obtuse angle, and section relief height be less than or
During equal to 100 μm, the section of optical film is smooth, and intensity is good, can prevent from being broken during super drawing, super drawing performance
It is good.
Further, cut off using hobboing cutter and glycerine is scribbled on hobboing cutter.When scribbling glycerine on hobboing cutter, it can significantly reduce
The defects such as the micro-crack of section, so as to further improve the ability of anti-super drawing fracture.
Further, the angle that the coarse part of the section is formed is 170-180 °.Inventor is testing and made
Found with middle, the angle that the coarse part of section is formed within the above range when, the anti-super drawing energy to failure of optical film
Power is stronger.
Further, the angle that the coarse part of the section is formed is 179-180 °.Inventor is testing and made
Found with middle, the angle that the coarse part of section is formed within the above range when, the anti-super drawing energy to failure of optical film
Power is very strong.
Further, the relief height of the optical film section is less than or equal to 30 μm.Inventor is testing and used
It is middle find, the relief height of optical film section within the above range when, film section is smooth non-microcracked, and defect is few, thin
Not easy to break during film stretching, the anti-super drawing fracture energy of optical film is more preferable.
The present invention also provides a kind of preparation method of polyvinyl alcohol optical film, and polyvinyl alcohol light is prepared using casting filming therapy
Learn film, including following preparation process：
(1) by the polyvinyl alcohol raw material by purifying washing in double screw extruder with plasticizer, water, antioxidant and de-
Mould agent mixing, deaeration；
(2) through T-shaped mould head extrusion to preliminarily dried on casting roller, when water content is less than 35%, from the roll surface of casting roller
It is upper to peel off；
(3) moisture is further backing out on many dryer rolls, subsequently enters and continue drying in air-floatation type oven；
(4) traction winding and packaging.
The advantage of this programme is as follows：(1) inventor has found, when the water content of optical film is less than 35%, film has one
Fixed intensity, and viscosity is small, is easily peeled off from from the roll surface of casting roller, and will not cause the surface damage of film；(2) adopt
During with preparation method of the invention, polyvinyl alcohol optical film is dried in air-floatation type oven, and polyvinyl alcohol optical film can uniformly hang
Float in baking oven, do not contacted with any surface, it is ensured that film surface is without any cut, with excellent surface smoothness, simultaneously
Film will not substantially be influenceed by uneven tension force, so can guarantee that the uniform drying of optical film；(3) using the present invention
Preparation method there is simple, efficient advantage, and the excellent performance of the optical film prepared.
Further, in step (1), the condition of work of double screw extruder is 65-115 DEG C of temperature, screw speed 25-
85rpm.The inventor of this programme has found that under these conditions, the uniformity of various raw material mixing is good, it is ensured that the product produced
Quality.
Further, the temperature of the casting roller is 70-95 DEG C.The inventor of this programme has found that the temperature of casting roller exists
When in above range, it is good that film stoste is cast to the stability being molded on casting roller.
Further, in step (2), under the conditions of 80-95 DEG C, by polyvinyl alcohol raw material and plasticizer, water, antioxidant and
The film making solution of surface-active formation is cast to be film-made on casting roller.Temperature is less than 80 DEG C, and moisture evaporation speed is slower, is unfavorable for
The drying and moulding of film and the uniformity of thickness；Temperature is higher than 95 DEG C, and PVA is easily dehydrated flavescence, and then influences the optics of film
Performance.
Further, in step (3), the temperature of dryer roll is 80-95 DEG C, direction of transfer of many dryer rolls along optical film
Rotating speed be incremented by, the speed difference of adjacent dryer roll is less than or equal to 5%.When setting in the manner described above, film is in transmit process
In be difficult to skid, and can preferably control membrane tension, be conducive to obtaining the uniform film of optical property.
Brief description of the drawings
Fig. 1 is the relief height schematic diagram represented by the optical film section of the embodiment of the present invention 1.
Embodiment
Below by embodiment, the present invention is further detailed explanation：
Describe polyethenol series optical film and preparation method thereof in detail by taking embodiment 1 as an example below, other embodiment is only shown
Go out in place of the difference with embodiment 1, other are unshowned same as Example 1.Raw material is selected below and is illustrated：
Polyethenol series optical film described above is to carry out casting film using polyvinyl alcohol resin material of preparing to form
's.As polyvinyl alcohol resin, usually using unmodified polyethylene alcohol system's resin or modified polyvinylalcohol system resin, i.e. will
Vinyl esters carries out the polyvinyl ester of solution copolymerization acquisition by polymerisation in solution or vinyl esters with other modified monomers
Polyvinyl alcohol resin is obtained by alcoholysis, crushing, squeezing.As composition that can be with vinyl esters combined polymerization, for example, it can enumerate
For undersaturated carboxylic acid or derivatives thereof, unsaturated sulfonic acid or its derivative, vinyl ethers, carbon number 2-30 a- alkene
Deng.
Above-mentioned vinyl esters is used during manufacture polyvinyl ester, for example, can be enumerated as：Vinylacetate, vinyl formate
Ester, vinyl laurate, propionate, vinyl butyrate, vinyl pivalate, tertiary ethylene carbonate, stearic acid second
Alkene ester, vinyl benzoate etc..This vinyl acetate can be above-mentioned one or two kinds of or two or more composition therein,
For the present invention, preferred vinylacetate.
It is above-mentioned to be preferably shorter than 10% with the consumption of the monomer of vinyl esters combined polymerization by mole percent, more preferably
Less than 5%.
The average alcoholysis degree of polyvinyl alcohol resin used in the present invention is usually more than 97mol%, particularly preferably
More than 99%, still more preferably more than 99.5%.When alcoholysis degree is less than 97%, optics film properties of film and by the film
The degree of polarization of obtained polaroid has the tendency of insufficient.The preferred 1500-8000 of the degree of polymerization of used polyvinyl alcohol, more preferably
1700-3500, particularly preferred 2000-3000, when too low, the mechanical strength of film has a declining tendency, when too high, polyvinyl alcohol
It is the productivity decline of resin.
Here, " alcoholysis degree " of this specification, is determined in the method described in " GB12010.5-89 is provided ", this theory
" average polymer " of bright book refers to what is determined on the basis of " GB12010.9 regulations ".
Polyethenol series material of preparing of the present invention is by through above-mentioned vinyl esters polymerization, alcoholysis, crushing, squeezing or acquisition
Aqueous polyvinyl alcohol resin is obtained by post processing (further alcoholysis and washing are purified) again.
When preparing optical film using above-mentioned polyvinyl alcohol resin, film stoste in mixture plasticizer, surfactant,
The auxiliary agent such as releasing agent and antioxidant is manufactured.
Above-mentioned plasticizer can effectively improve the extension property of film when preparing polarizer, usually polyhydroxy-alcohol, can arrange
Lift as glycerols, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, third such as glycerine, two glycerine, triglycerins
The aklylene glycol such as glycol, DPG, polypropylene glycol class or polyalkylene glycols, trimethylolpropane etc..These plasticising
Agent can be used alone and can also combine two or more and use.Preferably glycerine in the extensibility present invention to ensure film.
The content of above-mentioned plasticizer, relative to the mass parts of polyvinyl alcohol resin 100, preferred 5-25 mass parts, further
It is preferred that 9-18 mass parts.When content is very few, there is extensibility decline when polaroid is made, when excessive, acquisition it is poly-
The stability of ethenol system optical film has a declining tendency.
Generally, adhesion is acted on when surfactant has suppression film curling, and for example can be used alone anion surface active
Nonionic surfactant is used alone in agent, also can be combined and uses.
The surfactant can be enumerated as：The sulfuric acid ester types such as the carboxylic acid types such as potassium laurate, octyl salicylate, dodecane
The sulphonic acids such as base benzene sulfonate, can also be enumerated as the alkyl such as alkane ether type, the polyoxyethylene octyl phenylates such as the oily ether of polyethylene glycol oxide
The polypropylene glycol ether type of alkyl ester type, the polyethylene glycol oxide PPOXs such as the yellow ethene laurate of phenylate type, polyoxy etc., oleic acid diethyl
Alkanolamide type, polyoxyalkylene allyl benzene ether type of alkylolamides etc. etc..
The content of the surfactant, relative to the mass parts of polyvinyl alcohol resin 100, preferably 0.001-1 mass parts,
More preferably 0.005-0.1 mass parts.It is difficult to play a part of resist blocking and that and the peptizaiton of dyestuff when too low, film when excessive
The transparency declines.
In addition, generally using antioxidant during above-mentioned film to improve the yellowing-resistant and storage stability of film, antioxidant can
To be the arbitrary antioxidant such as phenol system antioxidant, BHT, 2,2- di-2-ethylhexylphosphine oxides (4- methyl-6-tert butyl
Phenol), four [3- (hydroxyphenyl of 3,5- di-t-butyls -4) propionic acid] quaternary amyl alcohol esters, three (2,4- di-tert-butyl-phenyls) phosphite esters,
Phosphorous acid three (2,4- di-tert-butyl-phenyl) ester etc., preferably latter two or latter three kinds of composition.Consumption is polyethenol series
The 5-50ppm of resin.
Embodiment 1
Present embodiment discloses a kind of polyvinyl alcohol optical film, using polyvinyl alcohol, plasticizer, water, antioxidant and surface
Prepared by activating agent, along the length direction of film, the angle that the coarse part of the section of thin-film width edge cutting portion is formed
For 170-180 °；As shown in figure 1, the surface topography of optical film section, its relief height is 20 μm.The present embodiment uses hobboing cutter
Cut off and glycerine is scribbled on hobboing cutter.
Present invention also offers the preparation method of above-mentioned polyvinyl alcohol optical film, polyvinyl alcohol is prepared using casting filming therapy
Optical film, including following preparation process：
(1) will by purifying washing polyvinyl alcohol raw material in double screw extruder with plasticizer, water, antioxidant and table
Face activating agent mixing, deaeration；The condition of work of double screw extruder is 65-115 DEG C of temperature, screw speed 25-85rpm.
(2) through T-shaped mould head extrusion to preliminarily dried on casting roller, when water content is about 26%, from the roll surface of casting roller
It is upper to peel off；The temperature of casting roller is 70-95 DEG C.
Under the conditions of 80-95 DEG C, by polyvinyl alcohol raw material and plasticizer, water, antioxidant and the system of surfactant formation
Coating solution curtain coating is film-made on casting roller.
(3) moisture is further backing out on many dryer rolls, subsequently enters and continue drying in air-floatation type oven；Dryer roll
Temperature is 80-95 DEG C, and rotating speed of many dryer rolls along the direction of transfer of film is incremented by, and the speed difference of adjacent dryer roll is less than or waited
In 5%.
(4) traction winding and packaging.
Embodiment 2
The present embodiment in place of the difference of embodiment 1 with being：Along the length direction of film, thin-film width edge cutting portion
The angle that the coarse part of section is formed is 90-95 °；The surface topography of film section, its relief height is about 35 μm；
When water content is about 32%, peeled off from the roll surface of casting roller.
Embodiment 3
The present embodiment in place of the difference of embodiment 1 with being：Along the length direction of film, thin-film width edge cutting portion
The angle that the coarse part of section is formed is 95-100 °；The surface topography of film section, its relief height is 95 μm；
When water content is about 32%, peeled off from the roll surface of casting roller.
Embodiment 4
The present embodiment in place of the difference of embodiment 1 with being：Along the length direction of film, thin-film width edge cutting portion
The angle that the coarse part of section is formed is 105-110 °；The surface topography of film section, its relief height is 55 μm；
When water content is about 32%, peeled off from the roll surface of casting roller.
Embodiment 5
The present embodiment in place of the difference of embodiment 1 with being：Along the length direction of film, thin-film width edge cutting portion
The angle that the coarse part of section is formed is 115-120 °；The surface topography of film section, its relief height is 65 μm；
When water content is about 32%, peeled off from the roll surface of casting roller..
Embodiment 6
The present embodiment in place of the difference of embodiment 1 with being：Along the length direction of film, thin-film width edge cutting portion
The angle that the coarse part of section is formed is 125-130 °；The surface topography of film section, its relief height is 75 μm；
When water content is about 32%, peeled off from the roll surface of casting roller.
Embodiment 7
The present embodiment in place of the difference of embodiment 1 with being：Along the length direction of film, thin-film width edge cutting portion
The angle that the coarse part of section is formed is 135-140 °.The surface topography of film section, its relief height is 85 μm；
When water content is about 32%, peeled off from the roll surface of casting roller.
Embodiment 8
The present embodiment in place of the difference of embodiment 1 with being：Along the length direction of film, thin-film width edge cutting portion
The angle that the coarse part of section is formed is 145-150 °.The surface topography of film section, its relief height is 95 μm；
When water content is about 32%, peeled off from the roll surface of casting roller.
Embodiment 9
The present embodiment in place of the difference of embodiment 1 with being：Along the length direction of film, thin-film width edge cutting portion
The angle that the coarse part of section is formed is 155-160 °.The surface topography of film section, its relief height is 45 μm；
When water content is about 32%, peeled off from the roll surface of casting roller.
Embodiment 10
The present embodiment in place of the difference of embodiment 1 with being：Along the length direction of film, thin-film width edge cutting portion
The angle that the coarse part of section is formed is 165-170 °.The surface topography of optical film section, its relief height is 30 μ
m；When water content is about 32%, peeled off from the roll surface of casting roller.
Embodiment 11
The present embodiment in place of the difference of embodiment 1 with being：Along the length direction of film, thin-film width edge cutting portion
The angle that the coarse part of section is formed is 179-180 °.The surface topography of film section, its relief height is 15 μm；
When water content is about 32%, peeled off from the roll surface of casting roller.
Embodiment 12
The present embodiment in place of the difference of embodiment 1 with being：The surface topography of optical film section, its relief height is about
45μm；When water content is about 32%, peeled off from the roll surface of casting roller.The thin surface topography for learning film section, it rises and falls high
Spend for 85 μm；When water content is about 32%, peeled off from the roll surface of casting roller.
Comparative example 1
The present embodiment in place of the difference of embodiment 1 with being：Along the length direction of film, thin-film width edge cutting portion
The angle that the coarse part of section is formed is 85-90 °.
Comparative example 2
The present embodiment in place of the difference of embodiment 1 with being：Cancel air-floatation type oven drying stage.
Comparative example 3
The present embodiment in place of the difference of embodiment 1 with being：Through T-shaped mould head extrusion to preliminarily dried on casting roller, work as water
When content is about 38%, peeled off from the roll surface of casting roller.
Comparative example 4
The present embodiment in place of the difference of embodiment 1 with being：The surface topography of optical film section, its relief height is about
105μm。
Comparative example 5
The present embodiment in place of the difference of embodiment 1 with being：The surface topography of optical film section, its relief height is about
115μm。
Above example 1-12 is detected respectively, and the break-draw rate of comparative example 1-3 correspondence polyvinyl alcohol optical films obtains table
Result in 1, wherein, the extension at break rate score of optical film is bigger, shows that super drawing performance is good, the elongation at break of film
Numerical value is smaller, shows that super drawing performance is poorer.
Table 1
By table 1 it can be found that in embodiment 1-12, the elongation at break of the optical film of preparation all 576% and more than；
But, the elongation at break of the optical film in comparative example 1-5 is 480%, 538%, 519%, 557%, 531% respectively, fracture
Elongation is significant lower, and super drawing performance is substantially poor.
Embodiment 1 is compared with comparative example 1, and the main distinction is the length direction along film, thin-film width edge cutting portion
Section the angular range that is formed of coarse part it is different, corresponding angular range is 85-90 ° in comparative example, so as to
To find out, along the length direction of film, the angular range that the coarse part of the section of thin-film width edge cutting portion is formed
The super drawing performance of optical film can be had a significant effect, length direction of the application claims along film, thin-film width edge is cut
The angle that the coarse part of the section in disconnected portion is formed is obtuse angle.
Embodiment 1 is compared with comparative example 2, and the main distinction is in comparative example 2 air-floatation type oven is not used, so as to see
Go out, the super drawing performance of optical film is had a significant effect using air-floatation type oven.
Embodiment 1 is compared with comparative example 3, and the main distinction is that water content scope is different when film is peeled off from casting roller,
It can thus be seen that water content can largely influence the polyvinyl alcohol light finally prepared when film is peeled off from casting roller
Learn the super drawing performance of film.Water content is less than 35% when application claims optical film is peeled off from casting roller.
Embodiment 3 is compared with comparative example 4, comparative example 5, and the main distinction is that the relief height of optical film section is different,
And the elongation at break for the polyvinyl alcohol optical film that embodiment 3 is obtained is significantly higher, super drawing performance is substantially preferable, so as to
To find out, the relief height of optical film section can have obvious shadow to the super drawing performance of the optical film finally prepared
Ring, the relief height of application claims optical film section is less than or equal to 100 μm, preferably lower than or equal to 30 μm.
Above-described is only that the general knowledge such as known characteristic does not make excessive description herein in embodiments of the invention, scheme.
It should be pointed out that for those skilled in the art, without departing from the inventive concept of the premise, some changes can also be made
Shape and improvement, these should also be considered as protection scope of the present invention, these effects and patent for implementing all without the influence present invention
Practicality.The scope of protection required by this application should be based on the content of the claims, the specific embodiment party in specification
Formula etc. records the content that can be used for explaining claim.
Claims (10)
1. a kind of polyvinyl alcohol optical film, is prepared, its feature using polyvinyl alcohol, plasticizer, water, antioxidant and surfactant
It is, along the length direction of film, the angle that the coarse part of the section of thin-film width edge cutting portion is formed is obtuse angle,
And the relief height of section is less than or equal to 100 μm.
2. a kind of polyvinyl alcohol optical film according to claim 1, it is characterised in that cut off using hobboing cutter and on hobboing cutter
Scribble glycerine.
3. a kind of polyvinyl alcohol optical film according to claim 1, it is characterised in that the coarse part institute of the section
The angle of formation is 170-180 °.
4. a kind of polyvinyl alcohol optical film according to claim 3, it is characterised in that the coarse part institute of the section
The angle of formation is 179-180 °.
5. a kind of polyvinyl alcohol optical film according to claim any one of 1-4, it is characterised in that the optical film cut-out
The relief height in face is less than 30 μm.
6. the preparation method of the polyvinyl alcohol optical film as described in claim 1-4, it is characterised in that use casting film-forming legal system
Standby polyvinyl alcohol optical film, including following preparation process：
（1）Polyvinyl alcohol raw material by purifying washing is lived in double screw extruder with plasticizer, water, antioxidant and surface
Property agent mixing, plasticizing, deaeration, be film-made stoste；
（2）Through T-shaped mould head extrusion to preliminarily dried on casting roller, when water content is less than 35%, shelled from the roll surface of casting roller
From；
（3）Moisture is further backing out on many dryer rolls, subsequently enters and continues drying in air-floatation type oven；
（4）Traction winding and packaging.
7. the preparation method of polyvinyl alcohol optical film according to claim 6, it is characterised in that step（1）In, twin-screw
The condition of work of extruder is 65-115 DEG C of temperature, screw speed 25-85rpm.
8. the preparation method of polyvinyl alcohol optical film according to claim 6, it is characterised in that the temperature of the casting roller
For 70-95 DEG C.
9. the preparation method of polyvinyl alcohol optical film according to claim 6, it is characterised in that step（2）In, in 80-
Under the conditions of 95 DEG C, by polyvinyl alcohol raw material and plasticizer, water, antioxidant and the film making solution curtain coating of surfactant formation in stream
Prolong and be film-made on roller.
10. the preparation method of polyvinyl alcohol optical film according to claim 6, it is characterised in that step（3）In, dry
The temperature of roller is 80-95 DEG C, and rotating speed of many dryer rolls along the direction of transfer of optical film is incremented by, and the speed difference of adjacent dryer roll is small
In or equal to 5%.
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