CN114325917A - Polarizer and preparation method thereof - Google Patents
Polarizer and preparation method thereof Download PDFInfo
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- CN114325917A CN114325917A CN202111621461.7A CN202111621461A CN114325917A CN 114325917 A CN114325917 A CN 114325917A CN 202111621461 A CN202111621461 A CN 202111621461A CN 114325917 A CN114325917 A CN 114325917A
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- 239000011241 protective layer Substances 0.000 claims description 39
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- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 claims description 4
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Abstract
The invention relates to the field of optical components, in particular to a polarizer and a preparation method thereof. The polaroid comprises a functional layer, wherein the functional layer comprises a printing substrate layer and a polarizing material layer which are arranged in a laminated mode, the printing substrate layer is an unstretched organic film, the polarizing material layer comprises a binder and two-way particles dispersed in the binder, and the two-way particles are arranged in an identical direction on the printing substrate layer. The polaroid has excellent polarization effect and good stability; the preparation method has the advantages of simple process, short production period, high industrial value and wider application value.
Description
Technical Field
The invention relates to the field of optical components, in particular to a polarizer and a preparation method thereof.
Background
Polarizers are optical devices for converting natural light or randomly polarized light into light polarized in a specific direction, and have been widely used in display panels, lenses, sunglasses, lamps.
However, in the prior art, the preparation process of the polarizer is very complicated, and the production period is long.
Therefore, it is very necessary to research a polarizer with more optimized process and excellent product performance.
Disclosure of Invention
The present invention is directed to overcoming the above problems encountered in the prior art, and to providing a novel polarizer and a method for manufacturing the same. The polaroid has excellent polarization effect and good stability; the preparation method has simple process, short production period and high industrial value.
The very important and necessary step in the preparation process of the functional layer of the polarizer in the prior art is stretching, and the stretching causes the bidirectional particles on the functional layer to be arranged in the same direction, thereby showing the polarization performance; and the prior art has had to incorporate dichroic particles into the functional layer by means of "dyeing". However, the inventors of the present invention have found that the steps of "stretching" and "dyeing" both make the production steps cumbersome, the production cycle longer, and also affect the product quality. In contrast, the inventor of the invention breaks through the conventional thinking inertia, provides the ingenious mode of the invention to greatly simplify the preparation process, ensures the excellent product performance, can select a proper high molecular film to load the dichroic particles according to the requirement without being limited by whether the dichroic particles have good adsorption performance or not, and greatly improves the application field and application value.
In order to achieve the above object, a first aspect of the present invention provides a polarizer, wherein the polarizer includes a functional layer, the functional layer includes a printed substrate layer and a polarizing material layer, the printed substrate layer is an unstretched organic film, the polarizing material layer includes a binder and dichroic particles dispersed in the binder, and the dichroic particles are arranged isotropically on the printed substrate layer.
According to a specific embodiment, the total weight of the bidirectional particles is 5% to 20% of the total weight of the polarizing material layer; thereby facilitating a more suitable distribution of the dichroic particles in the printed pattern by printing, resulting in a better homeotropicity of the alignment.
According to a specific embodiment, the total weight of the bidirectional particles is 8% to 15% of the total weight of the layer of polarizing material.
According to a specific embodiment, the bidirectional particles are selected from molecular iodine and/or an iodonium salt.
According to a specific embodiment, the binder is selected from one or more of polyvinyl alcohol, polyethylene glycol, aqueous polyurethane resin, aqueous acrylic resin, aqueous epoxy resin and hydrogel.
According to a specific embodiment, the binder comprises polyvinyl alcohol and polyethylene glycol, wherein the weight of the polyvinyl alcohol accounts for 65% -85% of the weight of the binder, and the weight of the polyethylene glycol accounts for 15% -35% of the weight of the binder; thereby helping the dichroic particles to maintain a substantially uniform dispersion during printing and being more suitable for the printing process.
According to a specific embodiment, the layer of polarizing material has a thickness of 5 μm to 75 μm.
According to a specific embodiment, the thickness of the printing substrate layer is 10 μm to 50 μm.
According to a specific embodiment, the material of the printing substrate layer is selected from one or more of polyethylene terephthalate, polyvinyl alcohol, polyurethane resin and epoxy resin.
According to a specific embodiment, the polarizer further includes a protective layer attached to at least one side of the polarizing material layer of the functional layer, and the material of the protective layer includes cellulose triacetate and/or polyethylene terephthalate. The protective layer can protect the performance of the functional layer, so that the polaroid is more stable.
According to a specific embodiment, the bidirectional particles are arranged into a plurality of arrays, the interval between two adjacent arrays is 10nm-10 μm, and the width of any one array is 10nm-10 μm; thereby contributing to a better homeotropism of the alignment of the bidirectional particles.
According to a specific embodiment, the interval between two adjacent queues is 100nm-500nm, and the width of any one column of queues is 100nm-300 nm; thereby contributing to a better homeotropism of the alignment of the bidirectional particles.
In one example, the polarizer includes a PET film layer, a polarizing material layer, and a PET film layer, which are stacked. In this embodiment, the printing substrate layer and the protective layer are both made of polyethylene terephthalate.
In one example, the polarizer includes a TCA film layer, a PVA film layer, a polarizing material layer, and a TCA film layer, which are stacked. In this embodiment, the materials of the printing base layer and the protective layer are polyvinyl alcohol and triacetylcellulose, respectively.
In one example, the polarizer includes a PET film layer, a polarizing material layer, and a TCA film layer. In this embodiment, the materials of the printing substrate layer and the protective layer are polyethylene terephthalate and cellulose triacetate, respectively.
The invention provides a method for preparing a polarizer, wherein the method comprises a step of preparing a functional layer, and the step of preparing the functional layer comprises the following steps:
dispersing the two-way particles in a binder to obtain polarized light slurry;
coating the polarized light slurry on a printing substrate layer in a printing mode;
and (4) carrying out heat treatment on the material obtained in the step.
According to a specific embodiment, the printed pattern is in the form of stripes, a matrix or a grid. Provides a specific arrangement mode of the printing pattern.
According to a specific embodiment, in the step of heat-treating the material obtained in the above step, the heat treatment conditions include: the temperature is 60-170 ℃ and the time is 1-10 h.
According to a specific embodiment, the method further comprises: and adhering a protective layer to at least one surface of the polarized slurry of the functional layer.
Compared with the polaroid and the preparation method thereof in the prior art, the invention has the main advantages that:
(1) the method can form a film in one step, has simple operation process, does not need to carry out multi-step procedures of dyeing, stretching and drying in the prior art, thereby reducing working hours, lowering cost and improving production efficiency;
(2) the method of the invention uses the dichroic particles which are uniformly dispersed, thereby avoiding the condition that the dichroic particles loaded by impregnation and other modes are frequently distributed unevenly, and improving the stability of the properties of the polaroid;
(3) the one-step film forming method ensures the uniformity of properties among all points of the polaroid and among different batches of polaroids, and further improves the stability of the properties of the polaroids;
(4) the polaroid can replace the conventional TCA with PET, and the implementation mode not only has better protection effect, but also obviously improves the high temperature resistance and high humidity resistance of the polaroid;
(5) the invention can select a proper polymer film to load the dichroic particles according to the requirement without being limited by whether the dichroic particles have good adsorption performance or not, thereby greatly improving the application value.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
Drawings
FIG. 1 is a schematic view of the structure of a polarizer of an example;
FIG. 2 is a schematic view of the structure of another example polarizer;
FIG. 3 is a schematic view of a structure of a polarizer of yet another example;
fig. 4 is a schematic view of a structure of a polarizer of yet another example.
Detailed Description
The present invention will be described in detail below by way of examples. The described embodiments of the invention are only some, but not all embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The inventors have found through long-term research that a functional layer containing bidirectional particles is an important component in a polarizer. The achievement of the polarizing effect of a polarizer relies on the homeotropic alignment of the dichroic particles, it being understood that the homeotropic alignment, i.e. the first aspect, is such that the dichroic particles are arranged in a plurality of substantially linear and mutually parallel rows, which is achieved in the prior art by a "stretching" step; the second aspect is to make each of the dichroic particles in the same direction (similar to the magnets having positive and negative poles, making the positive poles of all the tiny magnets facing in the same direction), and to achieve this, the prior art usually achieves this through a "drying" step.
Therefore, in order to obtain isotropically arranged dichroic particles, the functional layer of the current polarizer is often prepared by stretching a polymer film capable of adsorbing dichroic molecules, dyeing (i.e., adsorbing dichroic molecules), and then drying, or stretching and then drying after dyeing. The current production process includes a "stretching" step without exception, and the uniformity of the polymer film after stretching is not high enough, and the uniformity of properties from batch to batch is not good enough. And the stretching and dyeing processes are very complicated, and the production period is long.
Based on this, the present application provides a novel polarizer and a method for manufacturing the same, so as to solve the above-mentioned problems.
The invention provides a polarizer, wherein the polarizer comprises a functional layer, the functional layer comprises a printing substrate layer and a polarizing material layer which are arranged in a laminated mode, the printing substrate layer is an unstretched organic film, the polarizing material layer comprises a binder and two-way particles dispersed in the binder, and the two-way particles are arranged in a same direction on the printing substrate layer.
It will be appreciated that the layer of polarizing material may be applied to the printed substrate layer.
The functional layer containing the polarizing material layer in the polaroid is not stretched, so that the whole material is more uniform and can show more stable performance. The printing substrate layer of the present invention is an unstretched organic film, and since the unstretching is defined in the polarizer of the already formed product, that is, the organic film is not stretched both before and after the application of the polarizing material layer.
The property of the polarizer of the present invention that the dichroic particles are arranged in a plurality of rows (i.e., a homeotropic arrangement) may be achieved by printing. The spacing between two adjacent arrays may be from 10nm to 10 μm, preferably from 50nm to 1 μm. According to a preferred embodiment, the spacing between two adjacent arrays is between 100nm and 500 nm.
The width of any one of the arrays may be 10nm to 10 μm, preferably 10nm to 1 μm, more preferably 50nm to 500nm, and still more preferably 100nm to 300 nm.
By setting the spacing and/or width of the arrays, the arrangement of the dichroic particles can have better "isotropy", thereby achieving better polarization effects.
The dichroic particles of the present invention are uniformly dispersed in the binder. The prior art generally adopts an immersion method to load bidirectional particles, which is difficult to achieve full uniformity, thereby having influence on polarization performance. The difference of the invention is that the dichroic particles are used in the polarizer after reaching complete and sufficient uniformity, namely the dichroic particles and the adhesive are fully mixed uniformly and then coated on the printing substrate layer, so that the uniformity of the dichroic particles of the polarizer of the invention is complete and sufficient, and the uniformity is far better than that of the polarizer obtained in a load mode, therefore, the polarizer of the invention has better polarization performance and more stable performance among batches in batch production.
The content of the dichroic particles in the binder can be set as desired, the basic purpose being to disperse the dichroic particles in the binder in such a concentration that just 1-2 particles pass through the printing gap when printing is performed. For example, the total weight of the dichroic particles is 5% to 20% of the total weight of the polarizing material layer, and preferably, the total weight of the dichroic particles is 8% to 15% of the total weight of the polarizing material layer, based on the total weight of the polarizing material layer.
The bidirectional particles may be particles having a bidirectional property conventionally used in polarizers. For example, selected from molecular iodine, iodide salts (e.g., iodine chloride), and the like; iodine molecules are commonly used. In other embodiments, the dichroic particle may also be another particle with a bidirectionality, which is not limited herein.
Preferably, the binder is selected from one or more of polyvinyl alcohol (PVA), polyethylene glycol, aqueous polyurethane resin, aqueous acrylic resin, aqueous epoxy resin, and hydrogel. The binder is typically selected to be transparent.
More preferably, the binder comprises polyvinyl alcohol and/or polyethylene glycol.
According to a specific embodiment, the binder comprises polyvinyl alcohol and polyethylene glycol. Preferably, the weight of the polyvinyl alcohol accounts for 65-85% of the weight of the binder, and the weight of the polyethylene glycol accounts for 15-35% of the weight of the binder.
More preferably, the weight of the polyvinyl alcohol accounts for 70-80% of the weight of the binder, and the weight of the polyethylene glycol accounts for 20-30% of the weight of the binder.
Preferably, the weight of the adhesive accounts for 80% -95% of the total weight of the polarizing material layer, and preferably, the weight of the adhesive accounts for 85% -92% of the total weight of the polarizing material layer.
Preferably, the viscosity of the binder is from 15 to 30mPa/S, preferably from 18 to 25 mPa/S.
Preferably, the polyethylene glycol has a molecular weight of 4000Da to 6000 Da.
The thickness of the polarizing material layer is, for example, 5 μm to 75 μm, preferably 20 μm to 40 μm. The thickness of the polarizing material layer herein refers to the thickness of the adhesive film layer in a dry cured state in the finally manufactured polarizer.
The polarizing material layer of the present invention may further include components conventional in the art, but according to a preferred embodiment, the polarizing material layer of the present invention may include only the binder and the dichroic particles, which is very different from the prior art. In order to meet the requirements of the preparation process in the prior art, various auxiliary materials such as a defoaming agent and the like are usually added into the polarizing material layer; the polarizing material layer of the invention can not comprise auxiliary materials, thereby simplifying the process and avoiding some adverse effects brought by the auxiliary materials.
The thickness of the printing substrate layer is, for example, 10 μm to 50 μm.
The printing substrate layer is an unstretched organic film of a material selected from one or more of polyethylene terephthalate (PET), polyvinyl alcohol (PVA), polyurethane resin, and epoxy resin, for example.
According to a specific embodiment, the material of the printing substrate layer is PET, and the weight average molecular weight of the PET is 1.5 × 104Da～3×104Da, preferably 1.8X 104Da～2.2×104Da。
By using PET as a printing substrate layer and directly printing the dichroic particles on the PET in an isotropic arrangement mode, not only can one-step film formation be realized, but also the high temperature resistance and the high humidity resistance of the polarizer can be effectively improved.
According to another embodiment, the printing substrate layer is a polyvinyl alcohol film, i.e. both the printing substrate layer and the binder are polyvinyl alcohol), so that the base material of the resulting functional layer is more uniform.
The polaroid also comprises a protective layer, and the protective layer is at least attached to one side of the polarizing material layer of the functional layer. In the prior art, protective layers are generally arranged on the upper surface and the lower surface of a functional layer, so that the thickness of the film layer is increased, but only one protective layer can be arranged, and in some specific embodiments, for example, when a printing substrate layer is made of a material with better mechanical property such as PET, the protective layer can be attached to one side of a polarizing material layer; in other embodiments, for example when the printing substrate layer is made of a mechanically weak material such as PVA, protective layers are applied to both sides of the functional layer.
The material of the protective layer may be conventional in the art, such as triacetyl celluloseVitamin (TCA). The protective layer of the present invention may also be a PET film layer, which may be the same as or different from the printing substrate layer. Preferably, the properties of the PET film layer as the protective layer include: the weight average molecular weight is 1.5X 104Da～1.8×104Da, preferably 1.55X 104Da～1.65×104Da。
The thickness of the protective layer is, for example, 1 μm to 35 μm, preferably 8 μm to 25 μm.
The polarizer may have various laminated structures.
According to one embodiment, as shown in fig. 1, the polarizer includes a structure of "PET film layer 2 (printing substrate layer) + polarizing material layer 1+ PET film layer 2 (protective layer)" sequentially stacked. Since the present invention does not require stretching, there is no strict requirement for the properties of the printing substrate layer, and those substrate materials in the art which are difficult to use or have strict requirements when used because of "being not suitable for stretching", such as PET and the like; because the PET has good mechanical property, a protective film does not need to be covered after the PET is printed, thereby reducing the working procedures, reducing the film thickness and improving the product performance.
According to another embodiment, as shown in fig. 2, the polarizer includes a structure of "TCA film layer 4 (protective layer) + PVA film layer 3 (printed substrate layer) + polarizing material layer 1+ TCA film layer 4 (protective layer)" stacked in sequence.
According to still another embodiment, as shown in fig. 3, the polarizer includes a structure of "PET film layer 2 (printed substrate layer) + polarizing material layer 1+ TCA film layer 4 (protective layer)" sequentially stacked.
In addition to the functional layer and the protective layer, the polarizer of the present invention may further include various layers of a conventional polarizer, such as a pressure-sensitive adhesive, a release film, and the like, which may be disposed in a conventional manner. For example, the polarizer shown in fig. 4 includes a structure of "release film 6+ pressure-sensitive adhesive 5+ PET film layer 2 (printed substrate layer) + polarizing material layer 1+ PET film layer 2 (protective layer)" stacked in sequence.
Preferably, the polarizer has an overall thickness of 70 μm to 110 μm.
The second aspect of the present invention provides a method for preparing a polarizer, wherein the method comprises preparing a functional layer, and the process for preparing the functional layer comprises the following steps:
(1) dispersing the two-way particles in a binder to obtain polarized light slurry;
(2) coating the polarized light slurry on a printing substrate layer in a printing mode;
(3) and (4) carrying out heat treatment on the material obtained in the step.
The nature and choice of the raw materials (e.g. dichroic particles, binders, printing substrate layers, etc.) used in the second aspect of the invention are the same as defined in the first aspect of the invention, and the amounts used are the same as the amounts in the first aspect of the invention, or the corresponding amounts by which the amounts in the first aspect of the invention can be achieved are adjusted with reference thereto; in addition, the polarizing material layer in the first aspect of the present invention is formed after the polarizing paste in the second aspect of the present invention is subjected to a heat treatment.
One significant difference between the preparation method of the present invention and the prior art is that no stretching step is included.
In step (1), the dispersion may be carried out by stirring. For example, dichroic particle iodine is mixed with a binder PVA, and iodine is dissolved in PVA, so that a polarizing paste in which iodine molecules are uniformly dispersed in PVA can be obtained by mixing and stirring the two. In some embodiments, the bidirectional particles may be dissolved in a solvent and then mixed with a binder; preferably, the solvent is ethanol and/or water, in order to be evaporated in the subsequent heat treatment process.
In one embodiment, the polarizing paste may contain only the binder and the dichroic particles; in another embodiment, the polarizing paste may further include a solvent; in still another embodiment, the polarizing paste may further contain auxiliary materials conventional in the art, but in most cases, the present invention does not require additional auxiliary materials unless particularly required.
In step (2), the inventors of the present invention skillfully propose a printing manner to replace the stretching process to realize the isotropic arrangement of the bidirectional particles.
The process of printing and the selection of specific parameters thereof are guided by the isotropic arrangement that enables the first aspect of the invention to be achieved.
The printing process is for example screen printing.
According to a specific embodiment, the printed pattern has directionality such that the printed pattern meets the requirement of "homeotropic alignment" as described in the first aspect of the invention.
According to a specific embodiment, the printed pattern is striped.
According to another embodiment, the printed pattern is in the form of a matrix (i.e. the squares or dots are arranged in a matrix).
According to yet another embodiment, the printed pattern is in the form of a grid (i.e. vertically intersecting stripes).
In step (3), the material obtained in step (2) is subjected to a heat treatment aimed at orienting the dichroic particles (e.g. iodine molecules) in the same direction. The conditions of the heat treatment include: the temperature is 60-170 ℃, and the time is 1-10 h; preferably, the temperature is 80-90 ℃ and the time is 3-5 h.
The method may further comprise step (4): and adhering a protective layer to at least one surface of the polarized slurry of the functional layer.
The method of the present invention further includes assembling other layers in the polarizer except the functional layer and the protective layer according to the prior art, which is not described herein again.
In a third aspect, the invention provides a polarizer prepared according to the method of the second aspect. The polarizer has substantially the same characteristics and properties as the polarizer according to the first aspect of the present invention, and will not be described herein again.
The polaroid can be used in various scenes or products needing the polaroid, such as mobile phones, computers, vehicle-mounted products, cameras, sunglasses, automobile front lamps and the like.
The present invention will be described in detail below by way of examples. The described embodiments of the invention are only some, but not all embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The starting materials and reagents not specifically described in the following examples are commercially available standard substances.
Example 1
1) Material preparation
Printing a base layer: a1, a polyethylene terephthalate (PET) film, characterized by: the weight average molecular weight is 2.1X 104Da with a thickness of 30 μm;
adhesive: b1, the weight ratio of polyvinyl alcohol to polyethylene glycol is 75:25, the viscosity is 22 mpa/S;
dichroic particles: c1, elemental iodine;
protective layer: d1, a polyethylene terephthalate (PET) film, characterized by: the weight average molecular weight is 1.6X 104Da, thickness of 20 μm;
setting a printing pattern: e1, stripe shape, with a stripe width (width of a single printed line) of 200nm and a spacing between adjacent stripes of 500 nm.
2) Preparing a polarizer, comprising:
step one, uniformly stirring the dichroic particles and a binder to obtain a polarized light slurry, wherein the total weight of the dichroic particles accounts for 10% of the total weight of the polarized light slurry;
coating the obtained polarized slurry on the upper surface of the printing substrate layer according to a printing pattern by using a printing mode;
step three, carrying out heat treatment on the material obtained in the step two, wherein the temperature of the heat treatment is 85 ℃, and the time is 4 hours, so as to obtain a functional layer;
step four: using a PET film as a protective layer, and attaching the PET film to the polarized light slurry of the functional layer obtained in the step three to form a three-layer structure of a PET film layer, a polarized light material layer (30 microns) and a PET film layer;
step five: and sequentially laminating a pressure sensitive adhesive and a release film on one surface of the three-layer structure to obtain the polarizer.
Example 2
1) Material preparation
Printing a base layer: a1 (the same materials as in the above embodiments, which are not described herein, and the same below);
adhesive: b2, the weight ratio of polyvinyl alcohol to polyethylene glycol is 80:20, and the viscosity is 25 mpa/S;
dichroic particles: c1;
protective layer: d1;
setting a printing pattern: e2, square matrix shape, along the queue direction, the side length of each square is 150nm, and the distance is 150 nm; the pitch was 400nm along the vertical alignment.
2) Preparing a polarizer, comprising:
step one, mixing and stirring dichroic particles and a binder uniformly to obtain a polarized light slurry, wherein the total weight of the dichroic particles accounts for 8% of the total weight of the polarized light slurry;
coating the obtained polarized slurry on the upper surface of the printing substrate layer according to a printing pattern by using a printing mode;
step three, carrying out heat treatment on the material obtained in the step two, wherein the temperature of the heat treatment is 80 ℃, and the time is 3 hours, so as to obtain a functional layer;
step four: using a PET film as a protective layer, and attaching the PET film to the polarized light slurry of the functional layer obtained in the step three to form a three-layer structure of a PET film layer, a polarized light material layer (20 microns) and a PET film layer;
step five: and sequentially laminating a pressure sensitive adhesive and a release film on one surface of the three-layer structure to obtain the polarizer.
Example 3
1) Material preparation
Printing a base layer: a1;
adhesive: b3, mixing polyvinyl alcohol and polyethylene glycol in a weight ratio of 70: 30, the viscosity is 18 mpa/S;
dichroic particles: c1;
protective layer: d1;
setting a printing pattern: e3, grid-shaped, wherein the width of a single printed circuit in the queue direction is 200nm, and the interval between adjacent stripes is 300 nm; the width of the single printed line in the vertical alignment direction was 100nm and the spacing between adjacent stripes was 500 nm.
2) Preparing a polarizer, comprising:
step one, mixing and stirring dichroic particles and a binder uniformly to obtain a polarized light slurry, wherein the total weight of the dichroic particles accounts for 12% of the total weight of the polarized light slurry;
coating the obtained polarized slurry on the upper surface of the printing substrate layer according to a printing pattern by using a printing mode;
step three, carrying out heat treatment on the material obtained in the step two, wherein the temperature of the heat treatment is 90 ℃, and the time is 5 hours, so as to obtain a functional layer;
step four: using a PET film as a protective layer, and attaching the PET film to the polarized light slurry of the functional layer obtained in the step three to form a three-layer structure of a PET film layer, a polarized light material layer (40 mu m) and a PET film layer;
step five: and sequentially laminating a pressure sensitive adhesive and a release film on one surface of the three-layer structure to obtain the polarizer.
Example 4
The present group of examples is for explaining the influence of the setting parameters of the print pattern. This set of examples was carried out with reference to example 1, with the difference that the width and spacing of the print pattern settings were varied, in particular:
example 4a, the print pattern was set up as: the width of each stripe is 500nm, and the interval between every two adjacent stripes is 500 nm;
example 4b, the print pattern was set to: the width of the stripe is 500nm, and the interval between adjacent stripes is 1 μm;
and finally obtaining the polaroids respectively.
Example 5
This set of examples is presented to illustrate the effect of the binders of the present invention. This set of examples was carried out with reference to example 1, with the difference that the following adjustments were carried out:
example 5a, the amount ratio of polyvinyl alcohol to polyethylene glycol was varied, specifically, the polyvinyl alcohol to polyethylene glycol was comprised in a weight ratio of 60: 40;
example 5b, polyvinyl alcohol, a one-component binder, was used;
and finally obtaining the polaroids respectively.
Example 6
This example is used to illustrate the structure of "TCA film layer (protective layer) + PVA film layer (printed substrate layer) + polarizing material layer + TCA film layer (protective layer)", and the preparation method thereof.
1) Material preparation
Printing a base layer: a2, polyvinyl alcohol (PVA) film, thickness 10 μm;
adhesive: b1;
dichroic particles: c1;
protective layer: TCA film with thickness of 20 μm;
setting a printing pattern: E1.
2) preparing a polarizer, comprising:
the first three steps are carried out according to the embodiment 1 to obtain a functional layer;
step four: laminating a protective layer on the upper surface and the lower surface of the functional layer by using a laminated board to form a four-layer structure of a TCA film layer, a PVA film layer, a polarizing material layer and a TCA film layer;
step five: and sequentially attaching pressure sensitive adhesive and release film to one surface of the four-layer structure to obtain the polaroid.
Comparative example 1
The method is carried out by referring to the prior art, and specifically comprises the following steps:
a polyvinyl alcohol film having a thickness of 100 μm was swollen in a pure water solution for 75 seconds, and then subjected to a dyeing process in an iodine solution having a concentration of 0.1% for 60 seconds. Subsequently, the washing process was performed in a boric acid solution having a concentration of 0.12% for 20 seconds, and stretching was performed in a boric acid solution having a concentration of 3.5% at 55 ℃ by six times. Followed by drying in an oven at 80 c for 5 minutes to obtain a functional layer of the polarizer.
Referring to example 6, a protective layer TCA was attached to both the upper and lower surfaces of the functional layer of the obtained polarizer, and then a pressure sensitive adhesive and a release film were sequentially covered on one surface to obtain the polarizer.
Test example
The polarizers obtained in the previous examples and comparative examples were respectively tested for optical properties by the following methods:
the degree of polarization (DOP) of the thin polarizers manufactured according to the examples and comparative examples of the present invention was measured using a JASCO V-7100 spectrophotometer, and the results are reported in table 1.
TABLE 1
| DOP(％) | |
| Example 1 | 99.9552 |
| Example 2 | 99.9185 |
| Example 3 | 99.9334 |
| Example 4a | 99.3365 |
| Example 4b | 99.1523 |
| Example 5a | 99.8143 |
| Example 5b | 99.9078 |
| Example 6 | 99.9487 |
| Comparative example 1 | 99.9063 |
As can be seen from table 1, the polarizer of the present invention can achieve a polarization degree of 99% or more, can achieve a technical effect equivalent to that of the polarizer of comparative example 1 obtained by a conventional stretching method, and can be used to replace the existing conventional polarizer. And as can be seen from the preparation process, the preparation process of the invention does not comprise a stretching step, so that the whole material is more uniform and can show more stable performance; the invention does not include impregnation, thereby avoiding the condition of uneven adsorption of the bidirectional particles; the method can form a film in one step, and has simple operation process, thereby reducing working hours, reducing cost and improving production efficiency.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The polaroid is characterized by comprising a functional layer, wherein the functional layer comprises a printing substrate layer and a polarizing material layer which are arranged in a laminated mode;
the printing substrate layer is an unstretched organic film, the polarizing material layer comprises a binder and two-way particles dispersed in the binder, and the two-way particles are arranged in a same direction on the printing substrate layer.
2. The polarizer according to claim 1, wherein the total weight of the bidirectional particles is 5 to 20% of the total weight of the polarizing material layer;
preferably, the total weight of the bidirectional particles accounts for 8% -15% of the total weight of the polarizing material layer;
preferably, the bidirectional particles are selected from molecular iodine and/or an iodonium salt.
3. The polarizer according to claim 1 or 2, wherein the binder is selected from one or more of polyvinyl alcohol, polyethylene glycol, aqueous urethane resin, aqueous acrylic resin, aqueous epoxy resin and hydrogel;
preferably, the binder comprises polyvinyl alcohol and polyethylene glycol, wherein the weight of the polyvinyl alcohol accounts for 65-85% of the weight of the binder, and the weight of the polyethylene glycol accounts for 15-35% of the weight of the binder.
4. The polarizer according to any of claims 1 to 3, wherein the thickness of the polarizing material layer is 5 μm to 75 μm;
preferably, the thickness of the printing substrate layer is 10 μm to 50 μm;
preferably, the material of the printing substrate layer is selected from one or more of polyethylene terephthalate, polyvinyl alcohol, polyurethane resin, and epoxy resin.
5. The polarizer according to claim 1, further comprising a protective layer attached to at least one side of the polarizing material layer of the functional layer, wherein the material of the protective layer comprises triacetylcellulose and/or polyethylene terephthalate.
6. The polarizer according to claim 1, wherein said bidirectional particles are arranged in a plurality of rows, a space between two adjacent rows is 10nm to 10 μm, and a width of any row of said rows is 10nm to 10 μm;
preferably, the interval between two adjacent said queues is 100nm-500nm, and the width of any column of said queues is 100nm-300 nm.
7. The polarizer according to any of claims 1 to 6, wherein the polarizer comprises a PET film layer, a polarizing material layer and a PET film layer which are laminated; alternatively, the first and second electrodes may be,
the polaroid comprises a TCA film layer, a PVA film layer, a polarizing material layer and a TCA film layer which are arranged in a laminated manner; alternatively, the first and second electrodes may be,
the polaroid includes PET rete, polarisation material layer and the TCA rete of range upon range of setting.
8. A method of producing the polarizer according to any of claims 1 to 7, wherein the method comprises preparing a functional layer, the process of preparing the functional layer comprising the steps of:
dispersing the two-way particles in a binder to obtain polarized light slurry;
coating the polarized light slurry on a printing substrate layer in a printing mode;
and (4) carrying out heat treatment on the material obtained in the step.
9. The method of claim 8, wherein the printed pattern is striped, matrix-like, or grid-like.
10. The method according to claim 8 or 9, wherein in the step of heat-treating the material obtained in the above step, the heat-treating conditions include: the temperature is 60-170 ℃, and the time is 1-10 h;
preferably, the method further comprises: and adhering a protective layer to at least one surface of the polarized slurry of the functional layer.
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