Dye type polaroid for vehicle-mounted electronic rearview mirror and stretching process of dye type polaroid

Abstract

The invention relates to the technical field of polaroid preparation, and discloses a dye type polaroid for a vehicle-mounted electronic rearview mirror and a stretching process of the dye type polaroid. According to the invention, by selecting the PVA film with a specific polymerization degree and combining with the draw ratios of different multiples and different drying temperatures, the finally prepared polaroid product can give consideration to both optical performance and reliability, the dry temperature reliability reaches 105 DEG C, the high-temperature and high-humidity reliability reaches 85 DEG C * 85% * 500 h, and the polaroid has a good application prospect. And the surface transmittance and the surface reflectivity of the module under power-on and the surface reflectivity of the module under power-off are better, so that the use requirements of the polaroid for the vehicle-mounted rearview mirror are met.

Description

Technical Field

[0001] The invention relates to the technical field of polarizer preparation, and in particular to a dye-type polarizer for a vehicle-mounted electronic rearview mirror and a stretching process thereof. Background Art

[0002] With the increasing popularity of electric vehicles, the electronic streaming media rearview mirrors in cars are increasingly used, and new optical and reliability requirements are put forward for the performance of polarizers used in electronic streaming media rearview mirrors in cars. Since they are used in in-vehicle products, polarizers for automotive use need to meet the basic requirements of dry temperature ≥85 degrees and low temperature ≤-30 degrees Celsius, as well as higher high temperature and high humidity requirements, and have higher requirements for transmittance and polarization; when polarizers are matched with standard light valves and TFT modules, there are requirements for the reflectivity of the modules when they are powered on or off.

[0003] At present, the reliability requirements of conventional iodine-based polarizers for ordinary consumer use generally need to meet the basic requirements of dry temperature 70℃*240H, high temperature and high humidity: 40℃*95%*240H, low temperature ≤-20 degrees Celsius, and the requirements for transmittance, polarization, and high temperature are relatively low, which is difficult to meet the use requirements of polarizers for rearview mirrors of electronic streaming media in automobiles. Therefore, the existing technology needs to be improved and developed. Summary of the invention

[0004] The purpose of the present invention is to provide a high-transmittance, high-durability dye-type polarizer and its stretching process that meet the application requirements of vehicle-mounted electronic rearview mirrors, and to at least provide a beneficial choice or create conditions for solving one or more technical problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions.

[0006] A stretching process for a dye-type polarizer for a vehicle rearview mirror comprises the following steps.

[0007] 1) Wash the PVA film with a degree of polymerization of 1700-2400 in a water washing tank at 15-25°C at a stretching speed of 0.85-0.98 m / min.

[0008] 2) The washed PVA film is placed in a swelling tank at 20-30°C at a stretching speed of 1.0-1.5 m / min for swelling.

[0009] 3) The swollen PVA film is put into a dyeing tank at 25-35°C at a stretching speed of 1.3-1.8 m / min to be dyed by the dye.

[0010] 4) The dyed PVA film is washed in a cleaning tank at 25-35°C at a stretching speed of 1.8-2.1 m / min.

[0011] 5) The cleaned PVA film enters a stretching tank at 25-35°C at a stretching speed of 2.6-2.9 m / min for the first stretching.

[0012] 6) After the first stretching, the PVA film enters the second stretching tank at 35-45°C at a stretching speed of 2.7-4.2 m / min for the second stretching.

[0013] 7) Color correction: After the second stretching, the PVA film enters the color correction tank at a stretching speed of 4.6-5.9 m / min for color adjustment. The temperature of the color correction tank is 10-20℃.

[0014] 8) Cleaning and drying: the PVA film after color correction enters the cleaning tank to clean the film surface, and then enters the oven to dry.

[0015] The PVA film is selected from the P type / PS type of KURARAY Company of Japan or the M-6000 type PVA film of Japan Synthetic Chemical Industry.

[0016] More preferably, the PVA film is selected from the P-type 1700 degree of polymerization PVA film of Japan KURARAY Company, the water washing tank temperature is 20°C, the water washing stretching speed is 0.92m / min, the swelling tank temperature is 27°C, the swelling stretching speed is 1.19m / min, the dyeing tank temperature is 27°C, the dyeing stretching speed is 1.45m / min, the cleaning tank temperature is 29°C, the cleaning stretching speed is 1.98m / min, the stretching tank temperature is 33°C, the first stretching speed is 2.82m / min, the stretching tank temperature is 40°C, the second stretching speed is 3.83m / min, the color complement tank temperature is 16°C, the color complement stretching speed is 4.77m / min, the cleaning tank temperature is 20°C, and the PVA film drying oven is 60°C.

[0017] More preferably, the PVA film is selected from the M-6000 type 2400 polymerization degree PVA film of Japan Synthetic Chemical, the water washing tank temperature is 25°C, the water washing stretching speed is 0.98m / min, the swelling tank temperature is 30°C, the swelling stretching speed is 1.5m / min, the dyeing tank temperature is 33°C, the dyeing stretching speed is 1.8m / min, the cleaning tank temperature is 35°C, the cleaning stretching speed is 2.1m / min, the stretching tank temperature is 35°C, the first stretching speed is 2.9m / min, the stretching tank temperature is 45°C, the second stretching speed is 4.2m / min, the color complement tank temperature is 16°C, the color complement stretching speed is 5.9m / min, the cleaning tank temperature is 16°C, and the PVA film drying oven is 60°C.

[0018] More preferably, the PVA film is selected from PS type 2400 degree of polymerization PVA film of Japan KURARAY Company, the water washing tank temperature is 17°C, the water washing stretching speed is 0.85m / min, the swelling tank temperature is 24°C, the swelling stretching speed is 1.0m / min, the dyeing tank temperature is 27°C, the dyeing stretching speed is 1.55m / min, the cleaning tank temperature is 30°C, the cleaning stretching speed is 1.86m / min, the stretching tank temperature is 33°C, the first stretching speed is 2.62m / min, the stretching tank temperature is 36°C, the second stretching speed is 2.73m / min, the color complement tank temperature is 16°C, the color complement stretching speed is 4.62m / min, the cleaning tank temperature is 18°C, and the PVA film drying oven is 50°C.

[0019] On the other hand, the present invention also provides a dye-type polarizer for a vehicle rearview mirror, which has a PVA film made by the stretching process of the dye-type polarizer for a vehicle rearview mirror as described above, and protective films are attached to both sides of the PVA film.

[0020] More preferably, the protective film is a TAC film of type P980 produced by Taiwan DaHui or a TAC film of type PG801N produced by South Korea Hyosung.

[0021] More preferably, after the protective films are attached to both sides of the PVA film, the film is sequentially dried in four-section ovens, and a finished polarizer is obtained after cooling.

[0022] More preferably, the temperature of the four-section oven is 40-70°C.

[0023] The present invention adopts the above technical solution to have at least the following beneficial effects.

[0024] The present invention selects a specific PVA film and combines it with a specific stretching process. The polarizer product finally obtained can take into account both optical performance and reliability. The dry temperature reliability reaches 105°C, and the high temperature and high humidity reliability reaches 85°C*85%*500h. The surface transmittance and surface reflectivity when the module is powered on and the surface reflectivity when the module is not powered on are all good, meeting the use requirements of polarizers for vehicle rearview mirrors. DETAILED DESCRIPTION

[0025] In order to facilitate those skilled in the art to better understand the essence of the invention, the specific implementation methods of the present invention are described in detail below.

[0026] A dye-type polarizer for a vehicle rearview mirror, the preparation process of which is as follows: 1) washing, placing a PVA film with a polymerization degree of 1700-2400 in a washing tank for washing, the washing temperature is 15-25°C, and the washing stretching speed is 0.85-0.98 m / min; 2) Swelling, the PVA film after washing enters the swelling tank for swelling, the temperature of the swelling tank is 20-30℃, and the swelling stretching speed is 1.0-1.5m / min; 3) Dyeing, the PVA film after swelling enters the dyeing tank for dyeing, the temperature of the dyeing tank is 25-35℃, and the dyeing stretching speed is 1.3-1.8m / min; 4) Cleaning, the PVA film after dyeing enters the cleaning tank for cleaning, the temperature of the cleaning tank is 25-35℃, and the cleaning stretching speed is 1.8-2.1m / min; 5) First stretching, the washed PVA film enters the stretching tank for the first stretching, the temperature of the stretching tank is 25-35℃, and the stretching speed of the first stretching is 2.6-2.9m / min; 6) Second stretching, the PVA film after the first stretching enters the stretching tank for the second stretching, the stretching speed of the second stretching is greater than the stretching speed of the first stretching, the temperature of the stretching tank is 35-45℃, and the stretching speed of the second stretching is 2.7-4.2 m / min; 7) Color correction, the PVA film after the second stretching enters the color correction tank for color adjustment, the temperature of the color correction tank is 10-20℃, and the color correction stretching speed is 4.6-5.9 m / min; 8) Cleaning and drying, the PVA film after color correction enters the cleaning tank to clean the film surface, and then enters the oven for drying. The dried PVA film is laminated with the TAC film to produce a dye-type polarizer for vehicle rearview mirrors.

[0027] In step 8), the temperature of the cleaning tank is 15-25°C, and the temperature of the oven is 40-70°C.

[0028] After the dried PVA film is laminated with the TAC film, it enters a four-section drying oven for baking. The temperature of the four-section drying oven is 40-60°C, 40-60°C, 40-60°C, and 40-60°C. Example 1.

[0029] A dye-type polarizer for a vehicle rearview mirror, the preparation parameters of which are as follows: the PVA film is selected from the P-type 1700 degree of polymerization PVA film of KURARAY Company of Japan, the water washing tank temperature is 20 degrees, the PVA stretching speed is 0.92m / min, the swelling tank temperature is 27 degrees, the PVA stretching speed is 1.19m / min, the dyeing tank temperature is 27 degrees, the PVA stretching speed is 1.45m / min, the cleaning tank temperature is 29 degrees, the PVA stretching speed is 1.98m / min, the first stretching tank temperature is 33 degrees, the PVA stretching speed is 2.82m / min, the second stretching tank temperature is 40 degrees, the PVA stretching speed is 3.83m / min, the color-complementing tank temperature is 16 degrees, the PVA stretching speed is 4.77m / min, the cleaning tank temperature is 20 degrees, the PVA film drying oven is 60 degrees, and the PVA film is dried in four ovens after lamination at 55 degrees, 55 degrees, 55 degrees, and 55 degrees. TAC type: Taiwan Dahui P980. Example 2.

[0030] A dye-type polarizer for a vehicle rearview mirror, the preparation parameters of which are as follows: the PVA film is selected from the M-6000 type 2400 degree of polymerization PVA film of Japan Synthetic Chemical, the water washing tank temperature is 25 degrees, the PVA stretching speed is 0.98m / min, the swelling tank temperature is 30 degrees, the PVA stretching speed is 1.5m / min, the dyeing tank temperature is 33 degrees, the PVA stretching speed is 1.8m / min, the cleaning tank temperature is 35 degrees, the PVA stretching speed is 2.1m / min, the first stretching tank temperature is 35 degrees, the PVA stretching speed is 2.9m / min, the second stretching tank temperature is 45 degrees, the PVA stretching speed is 4.2m / min, the color-complementing tank temperature is 16 degrees, the PVA stretching speed is 5.9m / min, the cleaning tank temperature is 16 degrees, the PVA film drying oven is 60 degrees, and the PVA film is dried in four ovens after lamination at 60 degrees, 60 degrees, 60 degrees, and 60 degrees. TAC type: Korean Hyosung PG801N. Example 3.

[0031] A dye-type polarizer for a vehicle rearview mirror, the preparation parameters of which are as follows: the PVA film is selected from the PS type 2400 degree of polymerization PVA film of Japan KURARAY Company, the water washing tank temperature is 17 degrees, the PVA stretching speed is 0.85m / min, the swelling tank temperature is 24 degrees, the PVA stretching speed is 1.0m / min, the dyeing tank temperature is 27 degrees, the PVA stretching speed is 1.55m / min, the cleaning tank temperature is 30 degrees, the PVA stretching speed is 1.86m / min, the first stretching tank temperature is 33 degrees, the PVA stretching speed is 2.62m / min, the second stretching tank temperature is 36 degrees, the PVA stretching speed is 2.73m / min, the color-complementing tank temperature is 16 degrees, the PVA stretching speed is 4.62m / min, the cleaning tank temperature is 18 degrees, the PVA film drying oven is 50 degrees, and the PVA film is dried in four ovens at 50 degrees, 50 degrees, 55 degrees, and 55 degrees after lamination. TAC type: Taiwan Dahui P980.

[0032] Comparative example 1.

[0033] In this comparative example, the preparation process of the polarizer has not been changed, but the preparation parameters are different. The specific preparation parameters are as follows: the PVA film is selected from the P-type 1700 degree of polymerization PVA film of KURARAY Company of Japan, the water washing tank temperature is 20 degrees, the PVA stretching speed is 0.79m / min, the swelling tank temperature is 25 degrees, the PVA stretching speed is 0.96m / min, the dyeing tank temperature is 23 degrees, the PVA stretching speed is 1.19m / min, the cleaning tank temperature is 27 degrees, the PVA stretching speed is 1.66m / min, the first stretching tank temperature is 25 degrees, the PVA stretching speed is 2.28m / min, the second stretching tank temperature is 28 degrees, the PVA stretching speed is 2.55m / min, the color-complementing tank temperature is 10 degrees, the PVA stretching speed is 3.78m / min, the cleaning tank temperature is 15 degrees, the PVA film drying oven is 50 degrees, and the PVA film is dried in four ovens after lamination at 50 degrees, 50 degrees, 50 degrees, and 50 degrees. TAC type: Taiwan Dahui P980.

[0034] Comparative example 2.

[0035] In this comparative example, the preparation process of the polarizer has not been changed, but the preparation parameters are different. The specific preparation parameters are as follows: the PVA film is selected from the PS type 2400 degree of polymerization PVA film of Japan KURARAY Company, the water washing tank temperature is 25 degrees, the PVA stretching speed is 1.02m / min, the swelling tank temperature is 23 degrees, the PVA stretching speed is 1.77m / min, the dyeing tank temperature is 35 degrees, the PVA stretching speed is 2.88m / min, the cleaning tank temperature is 35 degrees, the PVA stretching speed is 3.58m / min, the first stretching tank temperature is 35 degrees, the PVA stretching speed is 4.78m / min, the second stretching tank temperature is 45 degrees, the PVA stretching speed is 5.66m / min, the color-complementing tank temperature is 20 degrees, the PVA stretching speed is 6.92m / min, the cleaning tank temperature is 20 degrees, the PVA film drying oven is 50 degrees, and the PVA film is dried in four ovens after lamination at 50 degrees, 50 degrees, 55 degrees, and 55 degrees. TAC type: Taiwan Dahui P980.

[0036] Comparative example 3.

[0037] This comparative example is basically the same as Example 1, except that the temperature of the cleaning tank is 26 degrees, the PVA film drying oven is 50 degrees, and the PVA film is dried in four ovens at 75 degrees, 75 degrees, 75 degrees, and 75 degrees after lamination.

[0038] Comparative example 4.

[0039] This comparative example is basically the same as Example 1, except that the type of TAC is German IPI 11P80U.

[0040] The optical performance and reliability tests were performed on the polarizers prepared in Examples 1-3 and Comparative Examples 1-4, and the results are shown in Table 1.

[0041] Table 1. Performance comparison of polarizers prepared in Examples 1-3 and Comparative Examples 1-4 sample Ys transmittance (the higher the better) Py polarization (the higher the better) Dry temperature reliability (the higher the better) High temperature and high humidity reliability (the higher the better) The surface transmittance of the module when powered on (the higher the better) is greater than or equal to 70% Module surface reflectivity when not powered (the higher the better) ≥40% Module surface reflectivity when powered on (the lower the better) ≤12% Example 1 52.01% 73.68% 105℃ 85℃*85%*500h 77.66% 45.9% 11.2% Example 2 55.53% 70.38% 105℃ 85℃*85%*500h 78.72% 47.3% 11.7% Example 3 50.36% 78.88% 105℃ 85℃*85%*500h 75.33% 44.7% 10.6% Comparative Example 1 48.56% 82.32% 100℃ 85℃*85%*500h 69.25% 43.6% 9.5% Comparative Example 2 56.46% 65.42% 95℃ 75℃*85%*500h 50.25% 48.1% 12.3% Comparative Example 3 52.73% 70.68% 95℃ 75℃*85%*500h 80.66% 46.9% 12.5% Comparative Example 4 48.56% 82.32% 100℃ 85℃*85%*500h 70.25% 43.6% 9.3% .

[0042] As can be seen from Table 1, the present invention can take into account both the optical performance and reliability of polarizer products. When one or more parameters exceed the limits of the present invention, one or more performances of the polarizer product will deteriorate or even fail to meet the requirements of relevant standards. Therefore, the technical effect of the present invention is the result of the synergistic effect of multiple parameters.

[0043] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. The parts not described in the specific embodiments are all prior art or common knowledge.

[0045] It should be noted that, in the description of the present invention, the content of the present invention can be more easily understood by referring to the detailed description of the preferred implementation method of the present invention and the embodiments included. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definitions in this specification shall prevail.

[0046] In the present invention, the term "prepared from..." is used synonymously with "comprising". The terms "comprising", "including", "having", "containing" or any other variation thereof, as used in the present invention, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus comprising the listed elements is not necessarily limited to only those elements, but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0047] In the present invention, when an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range limited by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including a range of "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5" etc. When a numerical range is described in the present invention, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0048] In addition, the indefinite articles "a" and "an" before the elements or components of the present invention have no restrictions on the quantity requirements (i.e. the number of occurrences) of the elements or components. Therefore, "a" or "an" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the number is obviously intended to be in the singular form.

Claims

1. A stretching process for a dye-type polarizer for a vehicle rearview mirror, characterized in that: Here are the steps: 1) Wash the PVA film with a degree of polymerization of 1700-2400 in a water washing tank at 15-25°C at a stretching speed of 0.85-0.98 m / min; 2) The washed PVA film enters a swelling tank at 20-30°C at a stretching speed of 1.0-1.5 m / min for swelling; 3) The swollen PVA film enters the dyeing tank at 25-35°C at a stretching speed of 1.3-1.8 m / min to dye the PVA film with dye; 4) The dyed PVA film is washed in a 25-35°C washing tank at a stretching speed of 1.8-2.1 m / min; 5) The cleaned PVA film enters the first stretching tank at 25-35°C at a stretching speed of 2.6-2.9 m / min for the first stretching; 6) After the first stretching, the PVA film enters the second stretching tank at 35-45°C at a stretching speed of 2.7-4.2 m / min for the second stretching; 7) Color correction: the PVA film after the second stretching enters the color correction tank at a stretching speed of 4.6-5.9 m / min for color adjustment. The temperature of the color correction tank is 10-20℃; 8) Cleaning and drying: the PVA film after color correction enters the cleaning tank to clean the film surface, and then enters the oven to dry; The PVA film is selected from the P type / PS type of KURARAY Company of Japan or the M-6000 type PVA film of Japan Synthetic Chemical Industry.

2. The stretching process of a dye-based polarizer for a vehicle rearview mirror according to claim 1, characterized in that: The PVA film is selected from P-type 1700 degree of polymerization PVA film produced by Japan KURARAY Company, with a washing tank temperature of 20°C, a washing stretching speed of 0.92 m / min, a swelling tank temperature of 27°C, a swelling stretching speed of 1.19 m / min, a dyeing tank temperature of 27°C, a dyeing stretching speed of 1.45 m / min, a cleaning tank temperature of 29°C, a cleaning stretching speed of 1.98 m / min, a stretching tank temperature of 33°C, a first stretching speed of 2.82 m / min, a stretching tank temperature of 40°C, a second stretching speed of 3.83 m / min, a color-complementing tank temperature of 16°C, a color-complementing stretching speed of 4.77 m / min, a cleaning tank temperature of 20°C, and a PVA film drying oven at 60°C.

3. The stretching process of a dye-based polarizer for a vehicle rearview mirror according to claim 1, characterized in that: The PVA film is selected from the M-6000 type 2400 polymerization degree PVA film of Japan Synthetic Chemical, the water washing tank temperature is 25°C, the water washing stretching speed is 0.98m / min, the swelling tank temperature is 30°C, the swelling stretching speed is 1.5m / min, the dyeing tank temperature is 33°C, the dyeing stretching speed is 1.8m / min, the cleaning tank temperature is 35°C, the cleaning stretching speed is 2.1m / min, the stretching tank temperature is 35°C, the first stretching speed is 2.9m / min, the stretching tank temperature is 45°C, the second stretching speed is 4.2m / min, the color complement tank temperature is 16°C, the color complement stretching speed is 5.9m / min, the cleaning tank temperature is 16°C, and the PVA film drying oven is 60°C.

4. The stretching process of a dye-based polarizer for a vehicle rearview mirror according to claim 1, characterized in that: The PVA film is selected from PS type 2400 degree of polymerization PVA film produced by Japan KURARAY Company, with a washing tank temperature of 17°C, a washing stretching speed of 0.85 m / min, a swelling tank temperature of 24°C, a swelling stretching speed of 1.0 m / min, a dyeing tank temperature of 27°C, a dyeing stretching speed of 1.55 m / min, a cleaning tank temperature of 30°C, a cleaning stretching speed of 1.86 m / min, a stretching tank temperature of 33°C, a first stretching speed of 2.62 m / min, a stretching tank temperature of 36°C, a second stretching speed of 2.73 m / min, a color-complementing tank temperature of 16°C, a color-complementing stretching speed of 4.62 m / min, a cleaning tank temperature of 18°C, and a PVA film drying oven at 50°C.

5. A dye-type polarizer for a vehicle rearview mirror, characterized in that: A PVA film made by a stretching process of a dye-type polarizer for a vehicle rearview mirror as described in any one of claims 1 to 4, with protective films attached to both sides of the PVA film.

6. The dye-based polarizer for a vehicle rearview mirror according to claim 5, characterized in that: The protective film is a P980 TAC film from Taiwan DaHui or a PG801N TAC film from South Korea Hyosung.

7. The dye-based polarizer for a vehicle rearview mirror according to claim 5, characterized in that: After the protective films are attached to both sides of the PVA film, the film is dried in four ovens in sequence, and the finished polarizer is obtained after cooling.

8. The dye-based polarizer for a vehicle rearview mirror according to claim 7, characterized in that: The temperature of the four-section oven is 40-70°C.