CN115160653A - Quarter wave plate and preparation method and application thereof - Google Patents

Quarter wave plate and preparation method and application thereof Download PDF

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CN115160653A
CN115160653A CN202210880889.1A CN202210880889A CN115160653A CN 115160653 A CN115160653 A CN 115160653A CN 202210880889 A CN202210880889 A CN 202210880889A CN 115160653 A CN115160653 A CN 115160653A
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quarter
wave plate
plate
phosphate
cellulose ester
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李良彬
韩雪晴
安敏芳
崔昆朋
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University of Science and Technology of China USTC
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University of Science and Technology of China USTC
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • 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
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/08—Cellulose derivatives
    • C08J2301/10—Esters of organic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/08—Cellulose derivatives
    • C08J2301/10—Esters of organic acids
    • C08J2301/12—Cellulose acetate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/08—Cellulose derivatives
    • C08J2301/14—Mixed esters

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  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Nonlinear Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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  • Materials Engineering (AREA)
  • Polarising Elements (AREA)

Abstract

The disclosure provides a quarter wave plate and a preparation method and application thereof. The quarter-wave plate comprises cellulose ester and additives; the quarter-wave plate belongs to NRZ type quarter-wave plate and satisfies n at 550nm wavelength x ＞n z ＞n y A relationship; the preparation method of the quarter-wave plate comprises the following steps: dissolving cellulose ester and an additive in a solvent to obtain a mixed solution; volatilizing the solvent in the mixed solution to prepare a coating film; stretching the coating filmAnd (4) quenching treatment, so that the cellulose ester molecular chains in the coating film are fixed and oriented to form the NRZ-type quarter-wave plate. The present disclosure utilizes a single cellulose ester polymer to obtain an NRZ-type quarter wave plate that is not dependent on viewing angle. The obtained quarter-wave plate is applied to a lambda/4 plate of organic light emitting display, a lambda/4 plate in an in-plane switching liquid crystal display mode, a lambda/4 plate for optical disk write receiving and a lambda/4 plate of a reflection increasing film.

Description

Quarter wave plate and preparation method and application thereof
Technical Field
The disclosure relates to the technical field of optical retardation films, in particular to a quarter-wave plate and a preparation method and application thereof.
Background
The lambda/4 film has been widely used in antireflection films, liquid crystal display devices, and the like, and has been practically used. Synthetic polymers such as polycarbonate for stretch films have been used.
NRZ type λ/4 films are increasingly used in antireflection films and liquid crystal display devices. In order to realize the effect of the NRZ type lambda/4 film, an optical retardation film having a phase difference, such as a + A film (n) can be prepared and laminated x >n y ＝n z ) and-A film (n) x <n y ＝n z ) Laminated or + A film (n) x >n y ＝n z ) And + C film (n) x ＝n y <n z ) And (4) realizing lamination. The viewing angle dependence of its uniaxial film is shown in FIG. 1 (where n is x Is the refractive index in the slow axis direction in the plane of the optical retardation film; n is y Is the refractive index in the longitudinal direction perpendicular to the slow axis direction; n is z The refractive index of the optical retardation film in the thickness direction perpendicular to the slow axis direction and the longitudinal direction). The quarter-wave plate obtained by laminating the optical retardation film is easy to have the defects of optical axis dislocation, difficult bonding and the like.
Disclosure of Invention
To at least partially solve at least one of the above-mentioned technical drawbacks, embodiments of the present disclosure generally provide a quarter wave plate, and a method for manufacturing the same and an application thereof, in which an NRZ-type quarter wave plate having no dependency on viewing angle is manufactured using a single polymer thin film.
In order to achieve the above object, as an embodiment of an aspect of the present disclosure, there is provided a quarter wave plate, a composition of which includes a cellulose ester and an additive; the quarter-wave plate belongs to NRZ type quarter-wave plate, and satisfies n at 550nm wavelength x >n z >n y Relation of delay values not followingA change in viewing angle; wherein n is x Is the refractive index in the slow axis direction, n, in the plane of the quarter-wave plate y Is a refractive index in a longitudinal direction perpendicular to the slow axis direction, n z The refractive index of the quarter-wave plate in the thickness direction perpendicular to the slow axis direction and the longitudinal direction is set.
According to an embodiment of the present disclosure, the thickness of the quarter wave plate is 5 to 1000 μm, preferably 10 to 500 μm.
According to the embodiment of the disclosure, the retardation value R of the quarter-wave plate is 550nm e 126 to 150nm, preferably 133 to 143nm; wherein the delay value R e The calculation formula of (2) is as follows: r e ＝(n x -n y ) X d; wherein d is the thickness of the quarter-wave plate and the unit is mum.
According to an embodiment of the present disclosure, when an angle between a slow axis on a plane of the quarter-wave plate and a polarization axis of the polarizing film includes 40 ° to 50 ° under a condition that the quarter-wave plate and the polarizing film are laminated, a circularly polarizing plate is obtained, preferably, 45 °.
According to an embodiment of the present disclosure, the above cellulose ester includes at least one of fatty acid-substituted cellulose esters having 6 or less carbon atoms; the additive comprises at least one of plasticizer, ultraviolet absorbent, antioxidant and delustering agent.
According to an embodiment of the present disclosure, the above-mentioned fatty cellulose ester includes at least one of cellulose acetate ester, cellulose propionate ester, cellulose butyrate ester, cellulose acetate propionate ester, and cellulose acetate butyrate ester; the plasticizer comprises at least one of phosphate and carboxylate; the antioxidant comprises hindered phenol compounds or phosphorus processing stabilizers, wherein the phosphorus processing stabilizers comprise tris (2,4-di-tert-butylphenyl) phosphite; the matting agent includes any one of silica, alumina, calcium carbonate, talc, china clay, calcium silicate hydrate, aluminum silicate, magnesium silicate, and calcium phosphate, and preferably silica.
According to an embodiment of the present disclosure, the phosphate ester includes at least one of triphenyl phosphate, trienyl phosphate, and trialkyl phosphate; the carboxylic ester comprises at least one of phthalate, citrate, butyl oleate, methyl acetyl ricinoleate, dibutyl sebacate, triglyceride, epoxy butyl furoate and epoxy butyl pupate oleate; the ultraviolet absorber includes at least one of triazine compounds, oxybenzophenone compounds, benzotriazole compounds, salicylate compounds, benzophenone compounds, cyanoacrylate compounds, and nickel complex salt compounds.
According to an embodiment of the present disclosure, the triphenyl phosphate includes at least one of tricresyl phosphate (TCP) and triphenyl phosphate (TPP); the trialkyl phosphate comprises at least one of trioctyl phosphate (TOP) and tributyl phosphate (TBP); the phthalate ester comprises at least one of dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), dioctyl phthalate (DOP), diphenyl phthalate (DPP) and diethylhexyl phthalate (DEHP); the citrate comprises at least one of triethyl citrate, tributyl citrate, o-acetyl triethyl citrate (OACTE) and o-acetyl tributyl citrate (OACTB).
As an embodiment of another aspect of the present disclosure, there is provided a method for preparing the above quarter-wave plate, including: dissolving cellulose ester and an additive in a solvent to obtain a mixed solution; volatilizing the solvent in the mixed solution to prepare a coating film; and (3) performing stretching quenching treatment on the coating film to fix the orientation of the cellulose ester molecular chains in the coating film and form optical anisotropy, thus obtaining the NRZ-type quarter-wave plate.
As an embodiment of another aspect of the present disclosure, there is provided an application of the above quarter-wave plate in a λ/4 plate of organic light emitting display, a λ/4 plate in an in-plane switching liquid crystal display mode, an optical disc write acceptance λ/4 plate, and a reflection enhancement film λ/4 plate.
The quarter-wave plate provided by the above embodiments of the present disclosure can obtain an NRZ-type quarter-wave plate having no dependency on viewing angle by using a single cellulose ester polymer.
Drawings
FIG. 1 is a schematic view showing the viewing dependence of a lambda/4 uniaxial film of NRZ type;
FIG. 2 is a schematic view of a refractive index ellipsoid of an optical retardation film; and
FIG. 3 is a graph of retardation R of a quarter-wave plate at 550nm according to an exemplary embodiment of the present disclosure e The change curve of the visual angle is shown schematically.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
The NRZ type optical retardation film satisfies n x >n z >n y In the polymer film of (1), wherein n x Is a refractive index in a slow axis direction in a plane of an NRZ type optical retardation film, n y Is the refractive index in the longitudinal direction perpendicular to the slow axis direction, n z Is a refractive index of the NRZ type optical retardation film in a thickness direction perpendicular to the slow axis direction and the longitudinal direction. The refractive index ellipsoid of the optical retardation film is schematically shown in FIG. 2. The NRZ type film, when the viewing angle is adjusted, the retardation becomes almost constant regardless of the viewing angle.
According to an aspect of the present disclosure, there is provided a quarter wave plate, a composition of which includes cellulose ester and an additive; the quarter-wave plate belongs to NRZ type quarter-wave plate, and satisfies n at 550nm wavelength x >n z >n y A relationship whose retardation value does not change with viewing angle; wherein n is x Is the refractive index in the slow axis direction in the plane of the quarter-wave plate (maximum refractive index in the plane of the quarter-wave plate), n y Is the refractive index in the longitudinal direction perpendicular to the slow axis direction, n z Is the refractive index of the quarter-wave plate in the thickness direction perpendicular to the slow axis direction and the longitudinal direction.
The quarter-wave plate provided by the embodiment of the disclosure can obtain the NRZ-type quarter-wave plate without dependency on viewing angle by using a single cellulose ester polymer.
As shown in FIG. 3, a quarter-wave plate obtained according to an exemplary embodiment of the present disclosure has a retardation value R at a wavelength of 550nm e Hardly changing with changes in viewing angle.
In some embodiments of the present disclosure, the thickness of the quarter wave plate is 5 to 1000 μm, for example: 100 μm, 360 μm, 560 μm, 680 μm, 980 μm; preferably 10 to 500. Mu.m, for example 50 μm, 180. Mu.m, 260. Mu.m, 360. Mu.m, 480. Mu.m. The thickness of the quarter-wave plate is measured by a micrometer (Guilin Guangdong digital measurement and control Co., ltd.).
In some embodiments of the present disclosure, the retardation value R of the quarter-wave plate is 550nm e 126 to 150nm, e.g., 130nm, 136nm, 145nm, 148nm, 149nm; preferably 133 to 143nm, for example 138nm, 139nm, 140nm, 141nm, 142nm; wherein the delay value R e The calculation formula of (2) is as follows: r e ＝(n x -n y ) X d; wherein d is the thickness of the quarter-wave plate and has a unit of μm. The average refractive index of the quarter-wave plate is measured using an Abbe refractometer (for example, trade name NAR-1T; japan ATAGO). In-plane retardation value R of quarter-wave plate e And a three-dimensional refractive index n x 、n y 、n z Measured using a phase difference meter (for example, trade name RETS-100L; available from Otsuka electronics Co., ltd.).
In some embodiments of the present disclosure, the circularly polarizing plate is obtained when an angle between a slow axis on a plane of the quarter-wave plate and a polarizing axis of the polarizing film includes 40 ° to 50 ° under a condition that the quarter-wave plate and the polarizing film are laminated, for example, 41 °, 42 °, 43 °, 44 °,45 °, 46 °, 48 °, 49 °. Wherein the polarizing film comprises one of iodine polarizing film, dye polarizing film and polyene polarizing film. The materials for preparing the iodine polarizing film and the dye polarizing film are generally polyvinyl alcohol films. A transparent protective film is generally provided on the surface of the polarizing film opposite to the plane of the quarter-wave plate.
In some embodiments of the present disclosure, the cellulose ester comprises at least one of a fatty acid substituted cellulose ester having 6 or less carbon atoms; the additive comprises at least one of plasticizer, ultraviolet absorbent, antioxidant and flatting agent.
In some embodiments of the present disclosure, the fatty cellulose ester comprises at least one of cellulose acetate ester, cellulose propionate ester, cellulose butyrate ester, cellulose acetate propionate ester, and cellulose acetate butyrate ester, wherein the average degree of acetylation (degree of acetylation) of the cellulose acetate is preferably in the range of 55.0 to 61.0%, e.g., 56.0%, 57.0%, 58.0%, 59.0%, 60.0%.
In some embodiments of the present disclosure, the plasticizer comprises at least one of a phosphate ester, a carboxylate ester, the phosphate ester comprising at least one of triphenyl phosphate, trienyl phosphate, trialkyl phosphate; the carboxylic ester comprises at least one of phthalate, citrate, butyl oleate, methyl acetyl ricinoleate, dibutyl sebacate, triglyceride, epoxy butyl furoate, and epoxy butyl pupate oleate. Wherein, the triphenyl phosphate comprises at least one of tricresyl phosphate and triphenyl phosphate; the trialkyl phosphate comprises at least one of trioctyl phosphate (TOP) and tributyl phosphate (TBP); the phthalate ester comprises at least one of dimethyl phthalate (DMP), diethyl phthalate (DEP), dibutyl phthalate (DBP), dioctyl phthalate (DOP), diphenyl phthalate (DPP) and diethylhexyl phthalate (DEHP); the citrate ester includes at least one of triethyl citrate, tributyl citrate, o-acetyl triethyl citrate (OACTE), and o-acetyl tributyl citrate (OACTB). The amount of the plasticizer added is 0.1 to 25% by mass of the quarter-wave plate, for example, 1%, 3%, 10%, 18%, 20%, 21%, 23%. The amount of the plasticizer added is 3 to 15% of the amount of the cellulose ester added, for example, 4%, 6%, 8%, 11%, 14%. Plasticizers can improve mechanical properties or increase drying speed.
In some embodiments of the present disclosure, the antioxidant comprises a hindered phenol-based compound or a phosphorus-based processing stabilizer, wherein the phosphorus-based processing stabilizer comprises tris (2,4-di-t-butylphenyl) phosphite.
In some embodiments of the present disclosure, the matting agent comprises any one of silica, alumina, calcium carbonate, talc, china clay, calcium silicate hydrate, aluminum silicate, magnesium silicate, calcium phosphate. Among them, the matting agent containing a silicon element can make the haze of the quarter-wave plate low and the haze value of the quarter-wave plate small, and for example, silica can be selected.
In some embodiments of the present disclosure, the ultraviolet absorber includes at least one of a triazine-based compound, an oxybenzophenone-based compound, a benzotriazole-based compound, a salicylate-based compound, a benzophenone-based compound, a cyanoacrylate-based compound, and a nickel complex salt-based compound. Any ultraviolet absorber can be used that satisfies the condition "excellent absorption energy of ultraviolet light having a wavelength of 370nm or less and less absorption of visible light having a wavelength of 400nm or more".
In some embodiments of the present disclosure, the solvent satisfies the condition of "an organic solvent capable of uniformly dissolving cellulose esters". The solvent includes ketones such as acetone, methyl ethyl ketone, cyclopentanone, and cyclohexanone; ethers such as Tetrahydrofuran (THF), 1,4-dioxane, 1,3-dioxane, and 1,2-dimethoxyethane; esters such as methyl formate, ethyl formate, methyl acetate, ethyl acetate, amyl acetate, and γ -butyrolactone; at least one of methyl cellosolve, dimethyl imidazolone, dimethylformamide, dimethylacetamide, acetonitrile, dimethyl sulfoxide, sulfone, nitroethane, dichloromethane, methyl acetoacetate, methanol, ethanol, n-propanol, isopropanol, n-butanol, sec-butanol, tert-butanol, propylene glycol monomethyl acyl, chlorinated hydrocarbon, acetone, diethyl ether, n-hexane, and the like.
According to an embodiment of the present disclosure, there is also provided a method for preparing a quarter wave plate as described above, including: dissolving cellulose ester and an additive in a solvent to obtain a mixed solution; volatilizing the solvent in the mixed solution to prepare a coating film; and (3) performing stretching quenching treatment on the coating film to fix the orientation of the cellulose ester molecular chains in the coating film and form optical anisotropy, thus obtaining the NRZ-type quarter-wave plate.
In some embodiments of the present disclosure, the cellulose ester particles are treated using hot air drying or vacuum oven drying. In order to ensure that the subsequent dissolution process in the reaction kettle is stable and is not interfered by moisture, the condition of reducing the water content of the cellulose ester particles to be less than 3 percent needs to be met; for example, "the water content of the cellulose ester particles is reduced to 1% or less". Since cellulose ester has a certain hygroscopicity, the drying temperature is 110 to 180 ℃, for example, 116 ℃, 120 ℃, 136 ℃, 148 ℃, 150 ℃, 168 ℃ and 176 ℃. The drying time includes 6 hours or more, and the longer the drying time, the lower the moisture content of the resulting cellulose ester particles. Wherein, the material is turned at least once every one hour in the drying process, so as to ensure the full drying of the cellulose ester particles, prevent the cellulose ester particles from agglomerating and ensure that the moisture content meets the experimental requirements.
In some embodiments of the present disclosure, the dissolving process of "dissolving cellulose ester and additives in a solvent to obtain a mixed solution" is performed in a reaction kettle, and the specific experimental steps include: under the stirring of a screw, cellulose ester and an additive are dissolved in a solvent, and the temperature of a reaction kettle and the rotating speed of the screw are controlled to fully dissolve the cellulose ester to obtain a mixed solution. Wherein the reaction temperature of the reaction kettle is controlled between 0 ℃ and 200 ℃, for example, 40 ℃, 80 ℃, 120 ℃, 160 ℃ and 190 ℃. In addition, the rotating speed of the screw also influences the reaction temperature in the reaction kettle, and the rotating speed of the screw can be increased on the premise of ensuring uniform stirring and stable temperature of the reaction kettle.
In some embodiments of the present disclosure, the operation of "volatilizing the solvent" in the step of "volatilizing the solvent in the mixed solution, and preparing the coating film" includes: pouring the mixed solution into a hopper, moving an automatic film scraper on a smooth glass plate at a constant speed, and carrying out blade coating on the mixed solution to obtain a mixed solution coating film; and (3) placing the semi-dry mixed solution coating film in an oven for drying to obtain a transparent coating film with a flat and smooth surface and uniform thickness. The residual amount of the solvent in the coating film at the completion of drying ranges from 0 to 2wt.%, for example, 0.6wt.%, 1.1wt.%, 1.4wt.%, 1.6wt.%, 1.9wt.%.
In some embodiments of the present disclosure, "the film is to be coatedIn the step of performing stretching quenching treatment to fix the orientation of the cellulose ester molecular chains in the coating film and form optical anisotropy, so as to obtain the NRZ-type quarter-wave plate, the specific process of the stretching comprises the following steps: the coating film is stretched by a film high-temperature biaxial stretching machine, and the NRZ-type quarter-wave plate is prepared by changing the conditions of the stretching ratio, the stretching speed, the stretching temperature and the like. Wherein the preheating temperature of the stretching is T g -50℃～T g +50 ℃ wherein T is g Is the glass transition temperature of the coating film. The draw ratio in the machine direction during drawing includes 1.05 to 2.0, e.g., 1.1, 1.2, 1.5, 1.8, 1.9; a stretching ratio in another direction of 1.05 to 2.0, for example: 1.15, 1.25, 1.55, 1.75, 1.95; the drawing speed is 0.1mm/s to 20mm/s, for example: 1mm/s, 6mm/s, 12mm/s, 16mm/s, 19mm/s. The specific process of quenching comprises the following steps: and transferring the quarter-wave plate prepared by stretching from a stretching temperature environment to a room temperature environment, and quenching to fix the orientation state of the quarter-wave plate.
In some embodiments of the present disclosure, the birefringence of the coated film is adjustable within a certain range by adjusting the stretching process parameters during the "stretching quenching treatment", so that the retardation value of the coated film is adjustable within a certain range. As shown in FIG. 3, the NRZ type quarter-wave plate according to the present disclosure has a retardation value R at a wavelength of 550nm when the thickness is about 170 μm after stretching about 1.4 times in thickness of 240 μm e About 139nm.
According to the embodiment of the disclosure, the application of the quarter-wave plate in the lambda/4 plate of organic light emitting display, the lambda/4 plate in an in-plane switching liquid crystal display mode, the lambda/4 plate for writing and receiving optical discs and the lambda/4 plate of a reflection increasing film is further provided.
The above-described embodiments, objects, technical solutions and advantages of the present disclosure are further described in detail, it should be understood that the above-described embodiments are only examples of the present disclosure, and should not be construed as limiting the present disclosure, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims (10)

1. A quarter-wave plate is characterized in that,
the quarter-wave plate comprises cellulose ester and additives;
the quarter-wave plate belongs to NRZ type quarter-wave plate and satisfies n at 550nm wavelength x >n z >n y A relationship whose retardation value does not change with viewing angle;
wherein n is x Is the refractive index in the slow axis direction in the plane of the quarter-wave plate, n y Is the refractive index in the longitudinal direction perpendicular to the slow axis direction, n z The refractive index of the quarter-wave plate in the thickness direction perpendicular to the slow axis direction and the longitudinal direction is set.
2. The quarter wave plate of claim 1,
the thickness of the quarter-wave plate is 5 to 1000 μm, preferably 10 to 500 μm.
3. The quarter wave plate of claim 1,
the retardation value R of the quarter-wave plate is 550nm e 126 to 150nm, preferably 133 to 143nm;
wherein the delay value R e The calculation formula of (2) is as follows: r e ＝(n x -n y )×d；
Wherein d is the thickness of the quarter-wave plate and has a unit of μm.
4. The quarter wave plate of claim 1,
under the condition that the quarter-wave plate and the polarizing film are laminated, when an included angle between a slow axis on a plane of the quarter-wave plate and a polarizing axis of the polarizing film includes 40 ° to 50 °, a circularly polarizing plate is obtained, preferably, 45 °.
5. The quarter wave plate of claim 1,
the cellulose ester comprises at least one of fatty acid substituted cellulose ester with the carbon number less than or equal to 6;
the additive comprises at least one of a plasticizer, an ultraviolet absorber, an antioxidant and a delustering agent.
6. The quarter-wave plate of claim 5,
the fatty cellulose ester comprises at least one of cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate and cellulose acetate butyrate;
the plasticizer comprises at least one of phosphate and carboxylate;
the antioxidant comprises a hindered phenol compound or a phosphorus processing stabilizer, wherein the phosphorus processing stabilizer comprises tris (2,4-di-tert-butylphenyl) phosphite;
the matting agent comprises any one of silicon dioxide, aluminum oxide, diamond oxide, calcium carbonate, talc, pottery clay, calcium silicate hydrate, aluminum silicate, magnesium silicate and calcium phosphate, and preferably silicon dioxide.
7. The quarter wave plate of claim 6,
the phosphate comprises at least one of triphenyl phosphate, trienyl phosphate and trialkyl phosphate;
the carboxylic ester comprises at least one of phthalate, citrate, butyl oleate, methyl acetyl ricinoleate, dibutyl sebacate, triglyceride, epoxy butyl furoate and epoxy butyl pupate oleate;
the ultraviolet absorber includes at least one of triazine compounds, oxybenzophenone compounds, benzotriazole compounds, salicylate compounds, benzophenone compounds, cyanoacrylate compounds, and nickel complex salt compounds.
8. The quarter wave plate of claim 7,
the triphenyl phosphate comprises at least one of tricresyl phosphate and triphenyl phosphate;
the trialkyl phosphate comprises at least one of trioctyl phosphate (TOP) and tributyl phosphate (TBP);
the phthalate ester comprises at least one of dimethyl phthalate, diethyl phthalate, dibutyl phthalate, dioctyl phthalate, diphenyl phthalate and diethylhexyl phthalate;
the citric acid ester comprises at least one of triethyl citrate, tributyl citrate, o-acetyl triethyl citrate and o-acetyl tributyl citrate.
9. A method of manufacturing a quarter wave plate according to any of claims 1 to 8, comprising:
dissolving cellulose ester and an additive in a solvent to obtain a mixed solution;
volatilizing the solvent in the mixed solution to prepare a coating film;
and (3) performing stretching quenching treatment on the coating film to fix the orientation of cellulose ester molecular chains in the coating film and form optical anisotropy, thus obtaining the NRZ-type quarter-wave plate.
10. Use of a quarter-wave plate according to any one of claims 1 to 9 in an organic light emitting display λ/4 plate, a λ/4 plate in an in-plane switching liquid crystal display mode, an optical disc write acceptance λ/4 plate, a reflection enhancing film λ/4 plate.
CN202210880889.1A 2022-07-26 2022-07-26 Quarter wave plate and preparation method and application thereof Pending CN115160653A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001100205A (en) * 1999-09-30 2001-04-13 Fuji Photo Film Co Ltd Guest-host reflection type liquid crystal display element
JP2004177570A (en) * 2002-11-26 2004-06-24 Fuji Photo Film Co Ltd Liquid crystal display device
JP2004309596A (en) * 2003-04-03 2004-11-04 Fuji Photo Film Co Ltd Elliptical polarizing plate and liquid crystal display device
US20120003402A1 (en) * 2005-02-22 2012-01-05 Polatechno Co., Ltd. Retardation Film Produced by Using Cellulose Derivative
CN114539631A (en) * 2022-01-30 2022-05-27 中国科学技术大学 Cellulose triacetate NRZ type optical compensation film and preparation method and application thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001100205A (en) * 1999-09-30 2001-04-13 Fuji Photo Film Co Ltd Guest-host reflection type liquid crystal display element
JP2004177570A (en) * 2002-11-26 2004-06-24 Fuji Photo Film Co Ltd Liquid crystal display device
JP2004309596A (en) * 2003-04-03 2004-11-04 Fuji Photo Film Co Ltd Elliptical polarizing plate and liquid crystal display device
US20120003402A1 (en) * 2005-02-22 2012-01-05 Polatechno Co., Ltd. Retardation Film Produced by Using Cellulose Derivative
CN114539631A (en) * 2022-01-30 2022-05-27 中国科学技术大学 Cellulose triacetate NRZ type optical compensation film and preparation method and application thereof

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