Dye-based polaroid for nylon polarized glasses

Abstract

The utility model discloses a dye-based polarizer for nylon polarized glasses. The dye-based polarizer comprises a release film, an acrylic adhesive layer, an upper TAC layer, a PVA layer and a lower TAC layer which are sequentially stacked from top to bottom, the acrylic adhesive layer has the following properties: 1, the acid value of the acrylic adhesive layer is less than 0.05; 2, the TG temperature of the acrylic adhesive layer is-20 DEG C to-8 DEG C; 3, the thickness of the acrylic adhesive layer is 5-25 [mu] m; and 4, the gel fraction of the acrylic adhesive layer is greater than 75%. The dye-based polaroid for the nylon polarized glasses does not need UV glue or PA optical-grade thin film, can be effectively cast and molded with PA resin, cannot fall off at an interface layer by layer, and is simple in process.

Description

Technical Field

[0001] The utility model relates to the technical field of polarizers. Background Art

[0002] Sunlight striking sand, water, roads, and snow is prone to reflecting glare. According to the Fresnel principle, when the angle between the reflected light and the horizontal plane is small, most of the light reflected to the human eye is polarized. Furthermore, because ordinary sunlight contains ultraviolet light, this type of light is harmful to the human eye. Therefore, to absorb the polarized light reflected into the human eye, polarizers are used in the lens manufacturing process, bonded with other resins or injection molded to produce polarized sunglasses.

[0003] Early polarized lenses were primarily made by injection-molding TAC (triacetate film) onto both sides of the polarizer. However, due to TAC's water resistance and price, lens manufacturers resorted to laminating PC (polycarbonate) to the TAC with UV adhesive, then injection-bending the film with PC resin. With the development of nylon film, which offers high light transmittance and water resistance, it is also more flexible than PC and less prone to cracking during the bending process. Therefore, PA (polyamide) resin is expected to replace PC as a common lens material. Currently, TAC is commonly injected directly onto PA resin. However, due to the differences in the properties of TAC and PC, the contact points between the two layers can easily fall off, limiting their use cases. A second approach involves first bonding the PA optical film and polarizing film with UV adhesive, then bending the film with PA resin. This approach presents two challenges: the UV adhesive used to bond the PA film to the UV adhesive is primarily monopolized by Japanese and Korean manufacturers, and the process requires increased UV light exposure, making it difficult to control. The second problem is that PA optical-grade films are currently monopolized by Japan and South Korea and are expensive. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the TAC and PA materials of the existing polarized glasses, such as easy delamination, high price and difficult process control, and propose a dye-based polarizer for nylon polarized glasses. The polarizer does not require UV glue or PA optical-grade film, and can be effectively cast with PA resin, without delamination or shedding at the interface, and the process is simple.

[0005] In order to solve the above technical problems, the utility model proposes the following technical solutions: a dye-based polarizer for nylon polarized glasses, comprising a release film, an acrylic adhesive layer, an upper TAC layer, a PVA layer and a lower TAC layer stacked in sequence from top to bottom;

[0006] The acrylic adhesive layer has the following properties:

[0007] 1. The acid value of the acrylic adhesive layer is less than 0.05;

[0008] 2. The TG temperature of the acrylic adhesive layer is -20℃ to -8℃;

[0009] 3. The thickness of the acrylic adhesive layer is 5-25um;

[0010] 4. The gel fraction of the acrylic adhesive layer is greater than 75%.

[0011] The above technical solution is further limited in that a lower acrylic adhesive layer is provided below the lower TAC layer, which has the same properties as the acrylic adhesive layer; a protective film is provided below the lower acrylic adhesive layer, and the base material used is a PE protective film or a PP protective film.

[0012] A further limitation of the above technical solution is that the thickness of the acrylic adhesive layer is 10-15 μm.

[0013] The above technical solution is further limited in that the thickness of the release film is 30-80 μm, the thickness of the upper TAC layer and the lower TAC layer is 80-120 μm, and the thickness of the PVA layer is 25-35 μm.

[0014] The above technical solution is further limited in that when the thickness of the acrylic adhesive layer is 5-10um, its creep value is less than 0.2mm / 1000s; when the thickness of the acrylic adhesive layer is 10-15um, its creep value is 0.3mm / 1000s; when the thickness of the acrylic adhesive layer is 15-20um, its creep value is 0.38mm / 1000s; when the thickness of the acrylic adhesive layer is 20-25um, its creep value is ≤0.45mm / 1000s; the glue creep value test method refers to the national standard GB: 7750-87, the temperature is 25°C, the test time is 1000s, and the load is 2KG.

[0015] The above technical solution is further limited in that the material of the release film is a base material PE material; the water permeability of the upper TAC layer and the lower TAC layer is 800-1500g / m 2 , UV absorption at 380nm is less than 0.5%.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the utility model discloses a dye-based polarizer for nylon polarized glasses, which does not require UV glue or PA optical-grade film, and can be effectively cast with PA resin without delamination or falling off at the interface, and the process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a schematic structural diagram of a dye-based polarizer for nylon polarized glasses.

[0018] Figure 2It is a structural schematic diagram of another embodiment of the dye-based polarizer for nylon polarized glasses of the present invention. DETAILED DESCRIPTION

[0019] See also Figure 1 A dye-based polarizer for nylon polarized glasses includes a release film 1, an acrylic adhesive layer 2, an upper TAC layer 3, a PVA layer 4, and a lower TAC layer 5 stacked in sequence from top to bottom.

[0020] The thickness of the release film 1 is 30-80 μm, and the material used is a base material PE material.

[0021] The acrylic adhesive layer 2 has the following properties:

[0022] 1. The acid value of the acrylic adhesive layer is less than 0.05, preferably less than 0.02;

[0023] 2. The TG temperature of the acrylic adhesive layer is -20°C to -8°C, preferably greater than -15°C to -10°C;

[0024] 3. The thickness of the acrylic adhesive layer is 5-25um, preferably 10-15um; when the thickness is 5-10um, its creep value is less than 0.2mm / 1000s, and the load is 2kg; when the thickness is 10-15um, its creep value is 0.3mm / 1000s; when the thickness is 15-20um, its creep value is 0.38mm / 1000s; when the thickness is 20-25um, its creep value is ≤0.45mm / 1000s; the creep value test method refers to the national standard GB: 7750-87, the temperature is 25℃, the test time is 1000s, and the load is 2KG.

[0025] 4. The gel fraction of the acrylic adhesive layer is greater than 75%.

[0026] The thickness of the upper TAC layer 3 is 80-120um and the water permeability is 800-1500g / m 2 , preferably

[0027] 1000-1200g / m 2 , UV absorption at 380nm is less than 0.5%.

[0028] The thickness of the PVA layer 4 is 25-35 μm.

[0029] The thickness of the lower TAC layer 5 is 80-120um and the water permeability is 800-1500g / m 2 , preferably

[0030] 1000-1200g / m 2 , UV absorption at 380nm is less than 0.5%.

[0031] like Figure 2 As shown, in another embodiment, a lower acrylic adhesive layer 6 is further provided below the lower TAC layer 5 , and the material properties of the lower acrylic adhesive layer 6 are the same as those of the acrylic adhesive layer 2 .

[0032] A protective film 7 is further provided below the lower acrylic adhesive layer 6, the base material of which is a PE protective film or a PP protective film.

[0033] The method for preparing the dye-based polarizer for nylon polarized glasses comprises the following steps:

[0034] Step 1: Crosslinking an acrylic raw resin having a number average molecular weight greater than 120W and a PDI (polydispersity index) distribution of 2-6 (preferably a PDI distribution of 3-6) with an isocyanate curing agent and / or an epoxy curing agent to obtain an acrylic adhesive having a viscosity of 1200-1500 and a gel fraction of 68-83%;

[0035] A PVA coil is unwound, swollen, dyed, stretched, color-corrected, and dried to obtain a PVA element (PVA layer 4); wherein the solutions and temperatures of each tank from front to back are as follows: the swelling tank uses deionized water at a temperature of 25-32°C; the dyeing tank contains a high-dichroic dye aqueous solution at a temperature of 35-45°C. Depending on different optical requirements, the high-dichroic dye can be selected from yellow, red, and blue, or a mixture of several thereof. The solubility of the dye solution is controlled between 0.05% (mass fraction) and 0.5%, and the solubility of the boric acid solution is controlled between 0.9% and 4%. The solution in the stretching tank is a boric acid solution at a temperature of 50-65°C; the solution in the color-corrected tank is a boric acid solution at a temperature of 25-35°C.

[0036] Step 2: Use PVA water-based glue to laminate TAC above and below the PVA element (PVA layer 4) to form an upper TAC layer 3 and a lower TAC layer 5, respectively. The temperature of the lamination process is controlled between 50-85°C. After lamination, use the acrylic glue from step 1 to laminate the PE protective film 7 below the lower TAC layer 5.

[0037] Step 3: Use a slit or micro-concave coating method to coat the acrylic glue in step 1 on the PP or PE release film 1, and then compound it on the top of the upper TAC layer 3 to obtain the dye-based polarizer for nylon polarized glasses of the present invention.

[0038] Preparation Example 1

[0039] An acrylic resin material with a molecular weight of 130W and a PDI of 4.5 was selected, and an acrylic glue aqueous solution was prepared with ethyl acetate and a curing agent (isocyanate curing agent). The solution viscosity was 1230 and the creep value of the glue was 0.25 mm.

[0040] Mitsubishi Chemical's PVA (M6000) was used and sequentially processed through washing, swelling, dyeing, stretching, color correction, and drying. The temperatures of the solutions in each tank were 27°C, 27°C, 31°C, 45°C, 30°C, and 65°C, respectively. The dye solution in the dyeing tank had a concentration of 0.3%, with a yellow:red:blue ratio of 1:1.5:2.6. The boric acid solution in the stretching tank had a concentration of 2.0%, and in the color correction tank, a concentration of 1.5%. This yielded the PVA element.

[0041] PVA hydrogel is used to compound TAC above and below the PVA element (PVA layer 4) to form an upper TAC layer 3 and a lower TAC layer 5. The moisture permeability of TAC is 1000g / m 2 Then, a PE protective film 7 was compounded under the lower TAC layer 5. The optical transmittance was measured to be 41.5%, and the polarization degree was 98, thereby obtaining a four-layer film material.

[0042] Apply the prepared acrylic adhesive solution to a release film 7 (e.g., a PP release film), then laminate it with the four layers of film material (specifically, above the upper TAC layer 3). Finally, the resulting material is injection molded with PA resin to produce the finished product. The finished product is tested for deformation over time, alkali delamination resistance, bending resistance, and high-temperature and high-humidity performance.

[0043] Comparative Example 1

[0044] Comparative Example 1 is the same as Preparation Example 1, except that the PDI of the acrylic resin material is 9 and the glue creep value of the acrylic glue solution is 0.28 mm.

[0045] Comparative Example 2

[0046] Comparative Example 2 is the same as Preparation Example 1, except that the glue creep value of the acrylic glue solution is 0.5 mm.

[0047] Comparative Example 3

[0048] Comparative Example 3 is the same as Preparation Example 1, except that the moisture permeability of TAC is 300 g / m 2 .

[0049] Comparative Example 4

[0050] Comparative Example 4 is the same as Preparation Example 1, except that the moisture permeability of TAC is 2000 g / m 2 .

[0051] Table 1 is a comparison table of the test results of Preparation Example 1 and Comparative Examples 1-4.

[0052]

[0053] Table 1

[0054] The utility model has the following beneficial effects: the utility model discloses a dye-based polarizer for nylon polarized glasses, which does not require UV glue or PA optical-grade film, and can be effectively cast with PA resin without delamination or shedding at the interface, and has a simple process.

Claims

1. A dye-based polarizer for nylon polarized glasses, characterized in that: It includes a release film, an acrylic adhesive layer, an upper TAC layer, a PVA layer and a lower TAC layer stacked in sequence from top to bottom; The acrylic adhesive layer has the following properties:

1. The acid value of the acrylic adhesive layer is less than 0.05; 2. The TG temperature of the acrylic adhesive layer is -20℃ to -8℃; 3. The thickness of the acrylic adhesive layer is 5-25um; 4. The gel fraction of the acrylic adhesive layer is greater than 75%.

2. The dye-based polarizer for nylon polarized glasses according to claim 1, wherein: A lower acrylic adhesive layer is provided below the lower TAC layer, which has the same properties as the acrylic adhesive layer above the upper TAC layer; a protective film is also provided below the lower acrylic adhesive layer, and the base material used is a PE protective film or a PP protective film.

3. The dye-based polarizer for nylon polarized glasses according to claim 1, wherein: The thickness of the acrylic adhesive layer is 10-15um.

4. The dye-based polarizer for nylon polarized glasses according to claim 1, wherein: The thickness of the release film is 30-80um, the thickness of the upper TAC layer and the lower TAC layer is 80-120um, and the thickness of the PVA layer is 25-35um.

5. The dye-based polarizer for nylon polarized glasses according to claim 4, characterized in that: When the thickness of the acrylic adhesive layer is 5-10um, its creep value is less than 0.2mm / 1000s; when the thickness of the acrylic adhesive layer is 10-15um, its creep value is 0.3mm / 1000s; when the thickness of the acrylic adhesive layer is 15-20um, its creep value is 0.38mm / 1000s; when the thickness of the acrylic adhesive layer is 20-25um, its creep value is ≤0.45mm / 1000s; the test method for the creep value of glue refers to the national standard GB: 7750-87, the temperature is 25℃, the test time is 1000s, and the load is 2KG.

6. The dye-based polarizer for nylon polarized glasses according to claim 4, wherein: The material of the release film is the base material PE material; the water permeability of the upper TAC layer and the lower TAC layer is 800-1500g / m 2 , UV absorption at 380nm is less than 0.5%.

Images