Anti-warping polaroid and polaroid anti-warping processing method

Abstract

The invention discloses an anti-warping processing method for a polaroid, which adopts a PVA material to play roles of polarized light and high transmittance, the chemical performance stability of PET and TAC can effectively protect a PVA layer with unstable chemical energy, and the anti-warping processing method for the polaroid comprises the following steps of: rewinding a whole reel structure of the wound polaroid into a coiled material with an outward bottom surface through a tube core; according to the method, the polaroid is placed in a baking device with the specific temperature to be baked, after standing is conducted at the normal temperature, flatness recovery of the polaroid is achieved, warping of the polaroid is effectively prevented, special PSA glue is adopted as the adhesive layer, warping prevention of the polaroid is achieved in an auxiliary mode, and the invention further discloses the anti-warping polaroid achieving the method.

Description

[0001] Methodology Area

[0002] The present invention belongs to the technical field of polarizer production technology, and in particular relates to a polarizer anti-warping processing method, and further relates to an anti-warping polarizer for realizing the method. Background Art

[0003] Polaroid is an artificial film that selectively absorbs light vibrations in different directions, so that the film has a special direction. When a beam of natural light hits the film, the light vibration component perpendicular to this direction is completely absorbed, and only the light vibration component parallel to this direction is allowed to pass. This specific direction is called the polarization direction of the polaroid. The full name of polaroid is polarizing film. The imaging of liquid crystal displays must rely on polarized light. All liquid crystals have two polarizing films in front and behind that are tightly attached to the liquid crystal glass, forming a liquid crystal film with a total thickness of about 1mm. If any polarizing film is missing, the liquid crystal film cannot display images. 3D glasses use this principle, and polaroids have a wide range of applications. They can not only be used as polarizing materials on LCDs, but also in sunglasses, anti-glare goggles, filters for photographic equipment, anti-glare treatment of car headlights and light quantity adjusters, etc. There are also polarizing microscopes and special medical glasses.

[0004] Since the structure of the polarizer is a composite of multiple layers of polymer films, each layer is bonded with glue, and there is a low-viscosity protective film and release film on the outermost side, the polarizer is easily affected by the environment and deformed and warped. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art solutions, the present invention provides an anti-warping polarizer and an anti-warping processing method for a polarizer, which can effectively solve the problems raised by the background technology.

[0006] A method for processing a polarizer to prevent warping comprises the following steps:

[0007] Step S1, setting a polarizer, wherein the polarizer is a roll structure;

[0008] Step S2, setting a tube core, rolling the polarizer onto the tube core with the reverse side as the bottom layer, and obtaining a coil structure with the reverse side facing outwards by rolling the tube core;

[0009] Step S3, setting an oven, putting the rolled polarizer into the oven for high-temperature baking, taking it out, and leaving it at room temperature for no less than 4 hours to restore it to flatness.

[0010] Particularly, in step S1, the overall length of the polarizer does not exceed 1000M.

[0011] Particularly, in step S2, the tube core is a cylindrical structure, and the diameter of the tube core is 18 cm-22 cm.

[0012] Particularly, in step S3, the set temperature of the oven is 70° C., and the polarizer is baked in the oven for no less than 90 minutes.

[0013] A warping-resistant polarizer for implementing the above method comprises a PVA layer, a PET layer is arranged on one side of the PVA layer, and a TAC layer is arranged on the other side, a protective film is arranged on the upper surface of the PET layer, a processing layer and a release film are arranged on the surface of the TAC layer, and an adhesive layer is arranged between the processing layer and the release film.

[0014] Particularly, the thickness of the PET layer is 80um-90um, the thickness of the PVA layer is 20um-25um, and the thickness of the TAC layer is 35um-45um.

[0015] In particular, the adhesive layer is composed of PSA glue, which is a UV-crosslinked pressure-sensitive adhesive. In the polymerization process of preparing the adhesive, at least one highly grafted initiator, a monomeric or oligomeric Norrish I type photoinitiator or an α-cleaver is used, and the concentration of the photoinitiator used is 0.25wt% to 0.75wt%; the overall thickness of the adhesive layer is 20um-30um.

[0016] Particularly, the specific components of the PSA glue are: ethyl acetate 11.0wt%-64.0wt%, 2-ethylhexyl acrylate 13.0wt%-72.0wt%, methacrylic acid 2.0wt%-25.0wt%, hydroquinone 1.0wt%-10.0wt%, antioxidant 2.0wt%-9.0wt%, substituted thiourea 2.0wt%-9.0wt%, and azobisisobutyronitrile 0.1wt%-3.0wt%.

[0017] The advantages and positive effects of the present invention are as follows:

[0018] The polarizer provided by the present invention adopts PVA material to play the role of polarized light and high transmittance, and the chemical performance stability of PET and TAC can effectively protect the chemically unstable PVA layer. The anti-warping processing method of the polarizer is to roll the wound polarizer overall reel structure back through a tube core into a coil with the bottom surface facing outward, put it into a baking device at a specific temperature for baking, and then stand it at room temperature to realize the flatness recovery of the polarizer, effectively prevent the warping of the polarizer, and adopt special PSA glue as the adhesive layer to assist in realizing the anti-warping of the polarizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a flow chart of the processing method of embodiment 1 of the present invention;

[0020] Figure 2 is a flow chart of the processing method of embodiment 2 of the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the polarizer of the present invention. DETAILED DESCRIPTION

[0022] In order to further understand the content, features and effects of the present invention, the following embodiments are listed and described in detail with reference to the accompanying drawings.

[0023] Embodiment 1:

[0024] Combine the following Figure 1 and Figure 3 The present invention is described as follows: a method for processing a polarizer to prevent warping, which comprises the following steps:

[0025] Step S1, setting a polarizer, wherein the polarizer is a roll structure; the overall length of the polarizer does not exceed 1000M.

[0026] Step S2, setting a tube core, rolling the polarizer onto the tube core with the reverse side as the bottom layer, and obtaining a coil structure with the reverse side facing outward by rolling the tube core; the tube core is a cylindrical structure, and the diameter of the tube core is 18cm-22cm.

[0027] Step S3, setting an oven, placing the rolled polarizer into the oven for high-temperature baking, taking it out, and leaving it at room temperature for at least 4 hours to restore it to flatness. The oven is set at 70° C., and the polarizer is baked in the oven for at least 90 minutes.

[0028] The anti-warping polarizer for implementing the above method includes a PVA layer, a PET layer is arranged on one side of the PVA layer, and a TAC layer is arranged on the other side, a protective film is arranged on the upper surface of the PET layer, a processing layer and a release film are arranged on the surface of the TAC layer, and an adhesive layer is arranged between the processing layer and the release film.

[0029] The thickness of the PET layer is 80um-90um, the thickness of the PVA layer is 20um. -25um, and the thickness of the TAC layer is 35um-45um. The adhesive layer is composed of PSA glue, which is a UV-crosslinked pressure-sensitive adhesive. In the polymerization of the adhesive, at least one highly grafted initiator, a monomeric or oligomeric Norrish I type photoinitiator or α-cleaver is used, and the concentration of the photoinitiator is 0.25wt% to 0.75wt%; the overall thickness of the adhesive layer is 20um-30um. The specific components of the PSA glue are: ethyl acetate 11.0wt%-64.0wt%, 2-ethylhexyl acrylate 13.0wt%-72.0wt%, methacrylic acid 2.0wt%-25.0wt%, hydroquinone 1.0wt%-10.0wt%, antioxidant 2.0wt%-9.0wt%, substituted thiourea 2.0wt%-9.0wt%, and azobisisobutyronitrile 0.1wt%-3.0wt%.

[0030] Embodiment 2:

[0031] Combine the following Figure 2 and Figure 3 The present invention is described as follows: a method for processing a polarizer to prevent warping, which comprises the following steps:

[0032] Step S1, setting a polarizer, wherein the polarizer is a roll structure; the overall length of the polarizer does not exceed 1000M.

[0033] Step S2, setting a tube core, rolling the polarizer onto the tube core with the reverse side as the bottom layer, and obtaining a coil structure with the reverse side facing outward by rolling the tube core; the tube core is a cylindrical structure, and the diameter of the tube core is 18cm-22cm.

[0034] Step S3: The rewound polarizer is placed in an independent space with the temperature and humidity set to 22°C, 85%RH for 12 hours. The polarizer is taken out of the independent space and placed in a conventional warehouse for 4 hours before sampling.

[0035] The anti-warping polarizer for implementing the above method includes a PVA layer, a PET layer is arranged on one side of the PVA layer, and a TAC layer is arranged on the other side, a protective film is arranged on the upper surface of the PET layer, a processing layer and a release film are arranged on the surface of the TAC layer, and an adhesive layer is arranged between the processing layer and the release film.

[0036] The thickness of the PET layer is 80um-90um, the thickness of the PVA layer is 20um. -25um, and the thickness of the TAC layer is 35um-45um. The adhesive layer is composed of PSA glue, which is a UV-crosslinked pressure-sensitive adhesive. In the polymerization of the adhesive, at least one highly grafted initiator, a monomeric or oligomeric Norrish I type photoinitiator or α-cleaver is used, and the concentration of the photoinitiator is 0.25wt% to 0.75wt%; the overall thickness of the adhesive layer is 20um-30um. The specific components of the PSA glue are: ethyl acetate 11.0wt%-64.0wt%, 2-ethylhexyl acrylate 13.0wt%-72.0wt%, methacrylic acid 2.0wt%-25.0wt%, hydroquinone 1.0wt%-10.0wt%, antioxidant 2.0wt%-9.0wt%, substituted thiourea 2.0wt%-9.0wt%, and azobisisobutyronitrile 0.1wt%-3.0wt%.

[0037] The production process of the present invention adopts PVA material to play the role of polarized light and high transmittance, the chemical property stability of PET and TAC can effectively protect the chemically unstable PVA layer, the polarizer anti-warping processing method, the wound polarizer overall reel structure is rewound into a coil with the bottom surface facing outward through a tube core, and after being placed in a baking device at a specific temperature for baking, the polarizer is allowed to stand at room temperature to achieve flat recovery, effectively prevent the polarizer from warping, and adopts special PSA glue as an adhesive layer to assist in achieving the anti-warping of the polarizer, which is beneficial to ensuring the quality of the polarizer and improving the yield rate of the polarizer.

[0038] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent changes and modifications made to the above embodiments based on the essence of the method of the present invention are within the scope of the method scheme of the present invention.

Claims

1. A method for processing polarizer anti-warping, characterized in that: This includes the following steps: Step S1, setting a polarizer, wherein the polarizer is a roll structure; Step S2, setting a tube core, and rolling the polarizer onto the tube core with the reverse side as the bottom layer, so as to obtain a coiled material structure with the reverse side facing outwards by rolling the tube core; Step S3, setting up an oven, placing the entire rolled polarizer into the oven for high-temperature baking, taking it out, and leaving it at room temperature for no less than 4 hours to restore it to its flat state.

2. The polarizer anti-warping processing method according to claim 1, characterized in that: In step S1, the overall length of the polarizer does not exceed 1000M.

3. The polarizer anti-warping processing method according to claim 1, wherein: In step S2, the tube core is a cylindrical structure, and the diameter of the tube core is 18 cm-22 cm.

4. The polarizer anti-warping processing method according to claim 1, wherein: In step S3, the set temperature of the oven is 70° C., and the polarizer is baked in the oven for no less than 90 minutes.

5. A warping-resistant polarizer for implementing the method of claim 1, characterized in that: It comprises a PVA layer, a PET layer is provided on one side of the PVA layer, and a TAC layer is provided on the other side. A protective film is provided on the upper surface of the PET layer, a processing layer and a release film are provided on the surface of the TAC layer, and an adhesive layer is provided between the processing layer and the release film.

6. The polarizer anti-warping processing method according to claim 5, characterized in that: The thickness of the PET layer is 80um-90um, the thickness of the PVA layer is 20um-25um, and the thickness of the TAC layer is 35um-45um.

7. The polarizer anti-warping processing method according to claim 5, characterized in that: The adhesive layer is composed of PSA glue, which is a UV-crosslinked pressure-sensitive adhesive. In the polymerization process for preparing the adhesive, at least one highly grafted initiator, a monomeric or oligomeric Norrish I type photoinitiator or an α-cleaver, is used. The concentration of the photoinitiator used is 0.25wt% to 0.75wt%; the overall thickness of the adhesive layer is 20um-30um.

8. The polarizer anti-warping processing method according to claim 7, characterized in that: The specific components of the PSA glue are: 11.0wt%-64.0wt% of ethyl acetate, 13.0wt%-72.0wt% of 2-ethylhexyl acrylate, 2.0wt%-25.0wt% of methacrylic acid, 1.0wt%-10.0wt% of hydroquinone, 2.0wt%-9.0wt% of antioxidant, 2.0wt%-9.0wt% of substituted thiourea, and 0.1wt%-3.0wt% of azobisisobutyronitrile.

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