Iodine dye and preparation method of iodine polarizing film
A polarizing film and dye technology, applied in the direction of organic dyes, polarizing elements, etc., can solve the problems affecting the optical performance of polarizing film, uneven dyeing of PVA film, environmental impact, etc., to improve the degree of polarization and transparency, not easy to volatilize, and improve stability Department of effect
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Embodiment 1
[0048] 1.1 Add 3 parts by weight of glycerol, 0.1 parts by weight of sodium dodecylsulfonate and 400 parts by weight of water to 30 parts by weight of polyvinyl alcohol (polymerization degree 2600, saponification degree 99.7%), at 90 ℃ Heat and stir until it is completely dissolved, let it stand for defoaming, and prepare a polyvinyl alcohol film with a thickness of 74 μm by casting method.
[0049] 1.2 Immerse the polyvinyl alcohol film obtained in 1.1 in pure water for 1 min, in a solution containing 2 parts by weight of polyvinylpyrrolidone-iodine complex, 1.5 parts by weight of disodium hydrogen phosphate, 0.1 parts by weight of potassium iodate, 5 parts by weight part of potassium iodide and 100 parts by weight of water in an iodine dye at 30°C for 200s, while stretching at a magnification of 2.5 times, then the film was washed in a water tank at 30°C for 10s, and then stretched at 2.3 times in air at 100°C. The magnification was uniaxially stretched for 4 minutes, and dr...
Embodiment 2
[0054] 2.1 Add 1 weight part of ethylene glycol, 0.05 weight part of sodium dodecylbenzene sulfonate and 200 weight parts of water to 15 weight parts of polyvinyl alcohol (polymerization degree 4000, saponification degree 99.8%), at 95 Heat and stir at ℃ until it is completely dissolved, let stand to remove bubbles, and prepare a polyvinyl alcohol film with a thickness of 75 μm by casting method.
[0055] 2.2 Immerse the polyvinyl alcohol film obtained in 2.1 in pure water for 50 seconds, and soak it in 10 parts by weight of polyvinylpyrrolidone-iodine complex, 3 parts by weight of disodium hydrogen phosphate, 1.5 parts by weight of potassium iodate, 25 parts by weight of Parts of potassium iodide and 400 parts by weight of water in iodine dyes were dyed at 25°C for 150s, and stretched at a rate of 2.8 times at the same time, then the film was washed in a water tank at 30°C for 10s, and then stretched at a rate of 1.5 times in air at 120°C. The magnification was uniaxially str...
Embodiment 3
[0059] 3.1 Add 30 parts by weight of glycerol and 5 parts by weight of calcium stearate to 100 parts by weight of polyvinyl alcohol (polymerization degree 1700, saponification degree 99.7%), and then add it to a high-speed mixer and stir fully and evenly. The stirring temperature is 70° C., and then melt-extrude the premixed material in a twin-screw extruder to prepare a polyvinyl alcohol film with a thickness of 75 μm. The temperature of the twin-screw extruder is 180° C., and the rotation speed is 150 rpm.
[0060] 3.2 Immerse the polyvinyl alcohol film obtained in 3.1 in pure water for 90s, in a solution containing 0.5 parts by weight of polyvinylpyrrolidone-iodine complex, 0.2 parts by weight of disodium hydrogen phosphate, 0.1 parts by weight of potassium iodate, 2 parts by weight Parts of potassium iodide and 200 parts by weight of water in an iodine dye at 30°C for 300s, while stretching at a magnification of 3 times, then the film was washed in a water tank at 30°C for ...
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