Polypolyamide (PA) dye system polaroid

Abstract

The utility model discloses a poly PA dye system polaroid which comprises an upper PA layer, a PVA layer and a lower PA layer which are sequentially stacked from top to bottom. And the upper PA layer and the PVA layer as well as the PVA layer and the lower PA layer are bonded by adopting a UV adhesive. The poly PA dye system polaroid provided by the utility model is bending-resistant and high-temperature-resistant and water-soaking-resistant, and does not have rainbow patterns.

Description

TECHNICAL FIELD

[0001] The utility model relates to polarizing plate technical field, concretely relates to a poly PA dye polarizing plate. BACKGROUND

[0002] The polarizing plate is a kind of material that can selectively absorb natural light.It can effectively absorb the light perpendicular to the polarizing axis, so that the light in the direction of polarizing axis passes, and finally makes natural light into linearly polarized light.Currently, polarizing plate can be divided into iodine polarizing plate and dye polarizing plate according to dyeing material.

[0003] Iodine polarizing plate has high transmittance and high polarization performance, but because iodine in iodine polarizing plate is easy to sublimate and volatilize, so its use field is limited.

[0004] Dye polarizing plate mainly uses high dichroic dye as light absorber, thereby effectively absorbing light in a certain direction.High dichroic dye has high temperature and humidity resistance performance, therefore, dye polarizing plate made of high dichroic dye also has high temperature and humidity resistance performance.

[0005] Because polarizing glasses have the characteristics of polarization and absorption of sunlight, they have become a necessary product for outdoor tourism.The main processing techniques of polarizing glasses currently used are stamping method, sandwich method and casting film method.The products on the market are still mainly the polarizing plates with PC-TAC-PVA-TAC structure, wherein PC is polycarbonate, TAC is triacetate cellulose, and PVA is polyvinyl alcohol.The polarizing plate has poor water resistance and high temperature resistance performance.Meanwhile, because the rigidity of PC material is large, PC is prone to crack or stress shrinkage during bending forming in the spectacle lens factory, resulting in changes in optical properties of the finished spectacle lens and affecting product quality. UTILITY MODEL CONTENTS

[0006] The technical problem to be solved by the utility model is to overcome the defects of poor water resistance and high temperature resistance performance of the polarizing plate of the existing polarizing glasses, and the crack or stress shrinkage of PC during bending forming in the spectacle lens factory, and to provide a poly PA dye polarizing plate, which is resistant to bending, high temperature and water and does not have rainbow stripes.

[0007] In order to solve the above technical problems, the utility model provides the following technical scheme: a poly PA dye polarizing plate, which comprises an upper PA layer, a PVA layer and a lower PA layer stacked from top to bottom, and the upper PA layer and the PVA layer and the PVA layer and the lower PA layer are bonded by UV adhesive.

[0008] The UV adhesive is a free radical type acrylic adhesive and / or a cationic type epoxy adhesive.

[0009] The thickness of the upper PA layer is 60-120 um.

[0010] The thickness of the PVA layer is 20-35 um.

[0011] The thickness of the lower PA layer is 60-120 um.

[0012] The phase difference value of the lower PA layer is less than or equal to 20 um.

[0013] The adhesive force between the upper PA layer and the PVA layer and between the PVA layer and the lower PA layer is greater than 1000 gf / 25 mm.

[0014] The upper PA layer is combined with a protective film, and the protective film is a PE material protective film or a PET material protective film.

[0015] Compared with the prior art, the poly-PA dye polarizing plate has the following beneficial effects: the poly-PA dye polarizing plate is resistant to bending, high temperature and water, and does not have rainbow patterns. The UV adhesive is a free radical type acrylic adhesive and / or a cationic type epoxy adhesive, and the UV adhesive is a solvent type UV adhesive, which is not dissolved by water, and thus has obvious high temperature and water resistance. The PA material with a low phase difference value is selected, and thus the rainbow patterns do not appear. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of a poly-PA dye polarizing plate in an embodiment of the present application.

[0017] Figure 2 is a structural schematic view of a poly-PA dye polarizing plate in another embodiment of the present application. DETAILED DESCRIPTION

[0018] Please refer to Figure 1 A poly-PA dye polarizing plate includes, from top to bottom, an upper PA layer 1, a PVA layer 2 and a lower PA layer 3.

[0019] The thickness of the upper PA layer 1 is 60-120 um, preferably 80-100 um.

[0020] The thickness of the PVA layer 2 is 20-35 um, preferably 25-30 um.

[0021] The thickness of the lower PA layer 3 is 60-120 um, preferably 80-100 um.

[0022] The phase difference value of the lower PA layer 3 is Re≤20 um, and the greater the phase difference value, the more likely the appearance detection to appear rainbow.

[0023] The UV adhesive is used to bond between the upper PA layer 1 and the PVA layer 2, and between the PVA layer 2 and the lower PA layer 3. The UV adhesive can be selected from a free radical type acrylic adhesive, a cationic type epoxy adhesive, or a mixed type adhesive of the above two. The UV adhesive in this embodiment can be ADEKA glue or LG glue.

[0024] The bonding force between the upper PA layer 1 and the PVA layer 2, and between the PVA layer 2 and the lower PA layer 3 is greater than 1000 gf / 25 mm.

[0025] Please refer to Figure 2 In another embodiment, a protective film 4 can be compounded on the upper PA layer 1 according to product requirements. The protective film 4 can be a PE material protective film or a PET material protective film.

[0026] The preparation method of the above-mentioned poly PA dye-based polarizing plate includes the following steps:

[0027] Step 1: A PVA with a thickness of 60 um is unwound, and then subjected to water washing, swelling, dyeing, stretching, color compensation, and drying in sequence to obtain a PVA element (PVA layer 2). The deionized water is used as the solvent for water washing and swelling, and the temperature is 25-32℃. The high dichroic red, yellow, and blue dyes are used as the solvent for the dyeing tank, and the ratio of yellow, red, and blue dyes is 1:2:2.6, and the concentration of the dye solution is 0.2%-1%, and the dyeing temperature is 30-40℃. The boric acid solution is used as the solution for the stretching tank, and the concentration of boric acid is 1%-5%, and the stretching temperature is 40-55℃. The boric acid solution is used as the solution for the color compensation tank, and the concentration of boric acid is 1%-5%, and the color compensation tank solution temperature is 30-35℃. The drying temperature is 45-80℃, preferably 60-75℃.

[0028] Step 2: The UV adhesive is used to bond PA on the upper and lower sides of the PVA element (PVA layer 2) to form the upper PA layer 1 and the lower PA layer 3. The UV lamp can be selected from a mercury lamp, a halogen lamp, or an organic lamp.

[0029] Step 3: The PET protective film or the PE protective film (protective film 4) is compounded on the upper PA layer 1.

[0030] Step 4: The bonding performance and appearance performance of the polarizing film are tested. The appearance detection method is to place the sample on the backlight with a polarizing film for detection, and the absorption axis of the sample and the absorption axis of the backlight with a polarizing film are perpendicular.

[0031] Preparation Example 1

[0032] PVA (M6000) from Mitsubishi Chemical was selected, and was subjected to water washing, swelling, dyeing, stretching, color compensation and drying procedures in sequence to obtain a PVA element (PVA layer 2). The solution temperatures of the respective tanks were 27℃, 27℃, 31℃, 45℃, 30℃ and 65℃ respectively. The concentration of the dye solution in the dyeing tank was 0.5%, the concentration of boric acid in the stretching tank was 2.0%, and the concentration of boric acid in the color compensation tank was 1.5%.

[0033] PA was bonded on the upper and lower sides of the PVA element (PVA layer 2) using a UV adhesive to form upper PA layer 1 and lower PA layer 3, wherein a halogen lamp was used for UV irradiation, and ADEKA glue or LG glue was used as the UV adhesive. The Re value of the lower PA layer 3 was 5um.

[0034] A PET protective film or a PE protective film (protective film 4) was compounded on the upper PA layer 1.

[0035] Preparation Example 2

[0036] The implementation steps were the same as those in Preparation Example 1, except that the Re value of the lower PA layer 3 material was 20um.

[0037] Comparative Example 1

[0038] The implementation steps were the same as those in Preparation Example 1, except that the adhesive was replaced by PVA water glue.

[0039] Comparative Example 2

[0040] The implementation steps were the same as those in Preparation Example 1, except that the Re value of the lower PA material was 50um.

[0041] Comparative Example 3

[0042] The implementation steps were the same as those in Preparation Example 1, except that the upper and lower functional layers (corresponding to the upper PA layer 1 and the PVA layer 2) were both replaced by PC.

[0043] The test results of the above examples and comparative examples are shown in the following table:

[0044]

[0045] The utility model has the following beneficial effects: the utility model discloses a poly - PA dye system polarizing plate is resistant to bending, is resistant to high temperature and is not appeared rainbow stripe when being soaked in water.

Claims

1. A poly(PA) dye-based polarizing film, characterized in that, It comprises upper PA layer, PVA layer and lower PA layer stacked from top to bottom, and the upper PA layer and the PVA layer and the PVA layer and the lower PA layer are bonded by UV adhesive, the UV adhesive is free radical type acrylic adhesive or cationic type epoxy adhesive, and the phase difference value Re of the lower PA layer is less than or equal to 20 um.

2. The poly-PA dye-based polarizing plate of claim 1, wherein The thickness of the upper PA layer is 60-120 um.

3. The poly-PA dye-based polarizing plate of claim 1, wherein The thickness of the PVA layer is 20-35 um.

4. The poly-PA dye-based polarizing plate of claim 1, wherein The thickness of the lower PA layer is 60-120 um.

5. The poly-PA dye-based polarizing plate of claim 1, wherein The bonding force between the upper PA layer and the PVA layer and the PVA layer and the lower PA layer is greater than 1000 gf / 25 mm.

6. The poly-PA dye-based polarizing plate of claim 1, wherein A protective film is combined with the upper PA layer, and the protective film is a PE material protective film or a PET material protective film.

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