CN111273389B - Low-cost high weatherability's polaroid for on-vehicle display - Google Patents
Low-cost high weatherability's polaroid for on-vehicle display Download PDFInfo
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- CN111273389B CN111273389B CN202010253426.3A CN202010253426A CN111273389B CN 111273389 B CN111273389 B CN 111273389B CN 202010253426 A CN202010253426 A CN 202010253426A CN 111273389 B CN111273389 B CN 111273389B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/16—Optical coatings produced by application to, or surface treatment of, optical elements having an anti-static effect, e.g. electrically conducting coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
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Abstract
The invention discloses a polarizer for a vehicle-mounted display screen, which is low in cost and high in weather resistance, and is characterized by comprising a protective film layer, a polarizer sub-protective layer, a polyvinyl alcohol polarizer sub-layer, a phase difference compensation film layer, a pressure-sensitive adhesive layer and a release film layer which are sequentially superposed from top to bottom, wherein the upper side and the lower side of the polyvinyl alcohol polarizer sub-layer are respectively connected with the polarizer sub-protective layer and the phase difference compensation film layer in an adhesion manner through an adhesive layer; the phase difference compensation film layer is a VA-TAC layer. Compared with the prior art, the invention does not need to arrange an additional TAC layer below the polyvinyl alcohol polarizer sublayer, reduces a layer of cellulose triacetate film (TAC) and pressure sensitive adhesive, also reduces the material cost and the production cost, has lower production cost and has popularization. Compared with the conventional wide-viewing-angle polarizer, the production cost of the invention can be saved by 10-20%.
Description
Technical Field
The invention relates to the technical field of polaroids, in particular to a low-cost high-weather-resistance polaroid for a vehicle-mounted display.
Background
With the rapid development of information technology, displays are commonly used in various aspects of information science. With the increasing demand of electronic products on liquid crystal display modules, the demand on corresponding viewing angle width and contrast is also higher and higher, the anisotropy of the viewing angle and the narrower viewing angle range, for example, when viewing angles are observed from different directions, the background colors are inconsistent, light leakage occurs at some viewing angles, the contrast ratio is deteriorated, the display effect of the liquid crystal display is seriously affected, and when the image is displayed, the image distortion occurs when the image is viewed at other angles.
With the increasing level of vehicle-mounted information and entertainment equipment, the variety and number of vehicle-mounted display screens are gradually increasing. Various new products with new technologies are emerging continuously, and the requirements on the efficacy and performance of the products and the price cost are higher and higher. Due to the restriction of the use environment (strong light, high temperature, etc.), the vehicle-mounted display screen has higher and higher requirements on the viewing angle width, the contrast, the weather resistance and the price besides the normal picture display. However, the current common polarizer products have poor dry temperature and weather resistance and can be yellowed; the temperature, humidity and weather-proof conditions can only reach 60 to 90 percent.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the polarizer for the vehicle-mounted display, which not only meets the vehicle-mounted weather resistance, but also has low cost and high contrast.
In order to achieve the purpose, the invention adopts the following technical scheme.
The polarizer with low cost and high weather resistance for the vehicle-mounted display screen is characterized by comprising a protective film layer, a polarizer sub-protective layer, a polyvinyl alcohol polarizer sub-layer, a phase difference compensation film layer, a pressure-sensitive adhesive layer and a release film layer which are sequentially superposed from top to bottom, wherein the upper side and the lower side of the polyvinyl alcohol polarizer sub-layer are respectively connected with the polarizer sub-protective layer and the phase difference compensation film layer in an adhesion manner through an adhesive layer; the phase difference compensation film layer is a VA-TAC layer.
More preferably, the polarizer protective layer has a moisture permeability of 300 g/(m)2Day), a poly (methyl methacrylate) film layer, a poly (ethylene terephthalate) film layer. According to different functional requirements, the surface of the polarizer sub-protection layer can be one or more of an uncoated layer and a combined functional coating, wherein the functional coating comprises an anti-scratch hardened layer, an anti-dazzle layer, an anti-oil and anti-fingerprint coating, an antistatic coating, a reflection reducing coating, an anti-reflection coating, a waterproof coating reflection increasing coating and an anti-reflection coating.
More preferably, the pressure-sensitive adhesive layer is composed of the following components: 10-60% of acrylic copolymer, 0.1-30% of tackifier, 10-80% of solvent, 0.01-10% of bridging agent, 0.01-5% of silane coupling agent, 0-10% of optical compensation regulator and 0.1-10% of antistatic agent.
More preferably, the bridging agent is one or more of a polyisocyanate bridging agent, an epoxy functional group-containing bridging agent and a metal-containing chelating agent bridging agent.
More preferably, the silane coupling agent is one or more of methyltrimethoxysilane, methyltriethylsilane, organosilane, octamethylcyclotetrasiloxane and gamma-aminopropyltriethoxysilane.
More preferably, the tackifier is one or more of rosin glyceride, modified rosin resin, hydrogenated rosin glyceride and hydrogenated rosin.
More preferably, the antistatic agent is one or more of sulfuric acid derivatives, phosphoric acid derivatives, amines, quaternary ammonium salts, imidazoles, and ethylene oxide derivatives.
More preferably, the thickness of the pressure-sensitive adhesive layer is 18-40 μm, and the molecular weight is 40-100 ten thousand.
More preferably, the polyvinyl alcohol polarizer sublayer 4 has a stretch ratio of 5 to 8, a transmittance of 42%, and a polarization degree of not less than 99.9%.
More preferably, the phase compensation value of the phase difference compensation film layer in the horizontal direction at the wavelength of 550nm is 50 ± 10nm, and the phase compensation value in the thickness direction is 130 ± 10 nm; the angle between the optical axis of the phase difference compensation film layer and the absorption axis of the polyvinyl alcohol polaroid sublayer is 0 +/-2 degrees.
More preferably, the adhesive is a thermosetting adhesive or an ultraviolet-curable adhesive.
The invention has the beneficial effects.
The phase difference compensation film layer adopts a VA-TAC layer, an extra TAC layer does not need to be arranged below a polyvinyl alcohol polarizer sublayer, a layer of triacetate cellulose film (TAC) and a layer of pressure sensitive adhesive are reduced, the material cost and the production cost are also reduced, the production cost is lower, and the popularization is higher. Compared with the conventional wide-viewing-angle polarizer, the production cost of the invention can be saved by 10-20%.
And secondly, adding optical compensation regulator, antistatic agent and tackifier with specific content into the pressure-sensitive adhesive layer, and combining with a corresponding low-moisture-permeability polarizer protective layer, so that the temperature-humidity weather resistance of the polarizer is remarkably improved. Through practical tests, the temperature-humidity weather resistance of the polaroid provided by the invention meets the test requirements of 65 × 93% and 80 × 90%; no bubble and no light leakage under high temperature or high humidity condition.
And thirdly, by selecting the polyvinyl alcohol polarizer sublayer and the phase difference compensation film layer with specific performances and limiting the angle between the optical axis of the corresponding phase difference compensation film layer and the absorption axis of the polyvinyl alcohol polarizer sublayer, the visual angle effect of the polarizer is effectively improved, the contrast is higher, the using effect is better, and the vehicle-mounted requirement is completely met.
Drawings
Fig. 1 is a schematic structural diagram of a polarizer for a vehicle-mounted display according to the present invention.
Reference numerals indicate the same.
1: protective film layer, 2: polarizer protective layer, 3: adhesive layer, 4: polyvinyl alcohol polarizer sublayer, 5: phase difference compensation film layer, 6: pressure-sensitive adhesive layer, 7: and a release film layer.
Detailed Description
The following describes the embodiments of the present invention with reference to the drawings of the specification, so that the technical solutions and the advantages thereof are more clear and clear. The embodiments described below are exemplary and are intended to be illustrative of the invention, but are not to be construed as limiting the invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Example 1.
As shown in fig. 1, the polarizer for the vehicle-mounted display screen with low cost and high weather resistance comprises a protective film layer 1, a polarizer protective layer 2, a polyvinyl alcohol polarizer sublayer 4, a phase difference compensation film layer 5, a pressure-sensitive adhesive layer 6 and a release film layer 7 which are stacked from top to bottom, wherein the polarizer protective layer 2, the polyvinyl alcohol polarizer sublayer and the phase difference compensation film layer are bonded and connected through an adhesive layer 3.
Wherein, the polarizer sub-protective layer 2 is a low moisture permeability uncoated cellulose triacetate film layer. The adhesive layer 3 is preferably a thermosetting adhesive.
The polyvinyl alcohol polaroid sublayer 4 is formed by swelling, dyeing, stretching and drying a polyvinyl alcohol film in an oven under the action of external force. The polyvinyl alcohol polarizer sublayer 4 is bonded with a cellulose triacetate film layer and a phase difference compensation film layer 5 respectively up and down through the adhesive layer 3. The polyvinyl alcohol polarizer sublayer 4 has the stretching ratio of 5-8, the transmittance of 42% and the polarization degree of more than or equal to 99.9%.
The phase compensation value of the phase difference compensation film layer 5 in the horizontal direction at the wavelength of 550nm is 50 +/-10 nm, and the phase compensation value in the thickness direction is 130 +/-10 nm. The angle between the optical axis of the phase difference compensation film layer 5 and the absorption axis of the polyvinyl alcohol polaroid sublayer 4 is 0 +/-2 degrees.
The pressure-sensitive adhesive layer 6 is a pressure-sensitive adhesive with an antistatic function, the thickness of the pressure-sensitive adhesive layer is 18-40 mu m, and the molecular weight of the pressure-sensitive adhesive layer is 40-100 ten thousand. Specifically, the composition of the pressure-sensitive adhesive layer 6 is constituted as follows: 10-60% of acrylic copolymer, 0.1-30% of tackifier, 10-80% of solvent, 0.01-10% of bridging agent, 0.01-5% of silane coupling agent, 0.01-10% of optical compensation regulator and 0.1-10% of antistatic agent; the bridging agent is one or more of a polyisocyanate bridging agent, a bridging agent containing epoxy functional groups and a bridging agent containing a metal chelating agent; the silane coupling agent is one or more of methyltrimethoxysilane, methyltriethylsilane, organosilane, octamethylcyclotetrasiloxane and gamma aminopropyltriethoxysilane; the tackifier is one or more of rosin glyceride, modified rosin resin/hydrogenated rosin resin, hydrogenated rosin glyceride and hydrogenated rosin; the antistatic agent is one or more of sulfuric acid derivatives, phosphoric acid derivatives, amines, quaternary ammonium salts, imidazoles and ethylene oxide derivatives. The optical compensation regulator is butyl acrylate.
The polarizer provided by the embodiment has the weather-resistant condition, and does not peel off/delaminate/discolor or the like when the polarizer lasts for 1000 hours at the temperature of 65 ℃ and the relative humidity of 93%; the film can be maintained at 80 deg.C and 90% relative humidity for 1000 hr without peeling, delamination, or discoloration.
When the polarizer is actually applied to a liquid crystal display, two sides of the liquid crystal display are respectively attached with one polarizer, namely the polarizer is divided into an upper polarizer and a lower polarizer, wherein the included angle between the absorption axis of the upper polarizer and the liquid crystal display is 0 degree or 45 degrees, and the included angle between the absorption axis of the lower polarizer and the liquid crystal display is 90 degrees or 135 degrees.
Example 2.
The polarizer for vehicle mounting provided by this embodiment has a structure substantially the same as that of embodiment 1, except that the polarizer is low in cost and high in weather resistance.
The polarizer protective layer 2 is a cellulose triacetate film layer combined with functional coatings such as an anti-dazzle anti-scratch hardened layer and the like.
And secondly, the polyvinyl alcohol polarizer sublayer 4 has a stretch ratio of 5-8, a transmittance of 38% and a polarization degree of 99.9%.
Example 3.
The polarizer for vehicle mounting provided by this embodiment has a structure substantially the same as that of embodiment 1, except that the polarizer is low in cost and high in weather resistance.
The polarizer sub-protective layer 2 is a polymethyl methacrylate film layer without a functional coating.
And secondly, the phase compensation value of the phase difference compensation film layer 5 in the horizontal direction at the wavelength of 550nm is 35 +/-10 nm, and the phase compensation value in the thickness direction is 440 +/-10 nm.
And thirdly, the adhesive 3 is an ultraviolet curing adhesive.
It will be appreciated by those skilled in the art from the foregoing description of construction and principles that the invention is not limited to the specific embodiments illustrated above, and that modifications and alterations based on the teachings of the invention known in the art are intended to be included within the scope of the invention, which is defined in the following claims and their equivalents. The details not described in the detailed description are prior art or common general knowledge.
Claims (8)
1. The polarizer for the vehicle-mounted display screen is low in cost and high in weather resistance, and consists of a protective film layer, a polarizer sub-protective layer, a polyvinyl alcohol polarizer sub-layer, a phase difference compensation film layer, a pressure-sensitive adhesive layer and a release film layer which are sequentially superposed from top to bottom, wherein the upper side and the lower side of the polyvinyl alcohol polarizer sub-layer are respectively connected with the polarizer sub-protective layer and the phase difference compensation film layer in an adhesion manner through an adhesive layer; it is characterized in that the preparation method is characterized in that,
the phase difference compensation film layer is a VA-TAC layer;
the pressure-sensitive adhesive layer comprises the following components: 10-60% of acrylic copolymer, 0.1-30% of tackifier, 10-80% of solvent, 0.01-10% of bridging agent, 0.01-5% of silane coupling agent, 0.01-10% of optical compensation regulator and 0.1-10% of antistatic agent; the optical compensation regulator is butyl acrylate;
the polarizer protective layer isThe moisture permeability is less than or equal to 300 g/(m)2Day), a poly (methyl methacrylate) film layer, a poly (ethylene terephthalate) film layer.
2. The polarizer with low cost and high weather resistance for the vehicle-mounted display screen according to claim 1, wherein the bridging agent is one or more of a polyisocyanate bridging agent, a bridging agent containing epoxy functional groups, and a bridging agent containing a metal chelating agent.
3. The polarizer for vehicle-mounted display screen with low cost and high weather resistance as claimed in claim 1, wherein the silane coupling agent is one or more of methyltrimethoxysilane, methyltriethylsilane, organosilane, octamethylcyclotetrasiloxane and gamma-aminopropyltriethoxysilane.
4. The polarizer for the vehicle-mounted display screen with low cost and high weather resistance as claimed in claim 1, wherein the tackifier is one or more of rosin glycerol ester, modified rosin resin, hydrogenated rosin glycerol ester and hydrogenated rosin.
5. The polarizer with low cost and high weather resistance for the vehicle-mounted display screen according to claim 1, wherein the antistatic agent is one or more of sulfuric acid derivatives, phosphoric acid derivatives, amines, quaternary ammonium salts, imidazoles and ethylene oxide derivatives.
6. The polarizer for the vehicle-mounted display screen with low cost and high weather resistance as claimed in claim 1, wherein the adhesive thickness of the pressure-sensitive adhesive layer is 18-40 μm, and the molecular weight is 40-100 ten thousand.
7. The polarizer for the vehicle-mounted display screen with low cost and high weather resistance as claimed in claim 1, wherein the polyvinyl alcohol polarizer sublayer 4 has a stretch ratio of 5-8, a transmittance of 42% and a polarization degree of not less than 99.9%.
8. The polarizer for vehicle display screen of claim 1, wherein the retardation compensation film layer has a horizontal phase compensation value of 50 ± 10nm at a wavelength of 550nm and a thickness phase compensation value of 130 ± 10 nm; the angle between the optical axis of the phase difference compensation film layer and the absorption axis of the polyvinyl alcohol polaroid sublayer is 0 +/-2 degrees.
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| CN202010253426.3A CN111273389B (en) | 2020-04-02 | 2020-04-02 | Low-cost high weatherability's polaroid for on-vehicle display |
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| CN202010253426.3A CN111273389B (en) | 2020-04-02 | 2020-04-02 | Low-cost high weatherability's polaroid for on-vehicle display |
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| CN111273389B true CN111273389B (en) | 2022-05-06 |
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