A kind of preparation method of polyvinyl alcohol polarizing film
A polyvinyl alcohol film, polyvinyl alcohol technology, applied in optics, optical elements, polarizing elements, etc., can solve the problem of poor water resistance of polarizing films
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[0048] The invention provides a kind of preparation method of polyvinyl alcohol polarizing film, comprising the following steps:
[0049] a. Immersing the hydrophobically modified polyvinyl alcohol film in the dye solution and first stretching to obtain the first intermediate film, the hydrophobically modified polyvinyl alcohol film is a polyvinyl alcohol film modified by a silane coupling agent .
[0050] b. performing fixing treatment and second stretching on the first intermediate film in a fixative solution to obtain a second intermediate film;
[0051] c. Heat-treating the second intermediate film to obtain a polyvinyl alcohol polarizing film.
[0052] In the present invention, the hydrophobically modified polyvinyl alcohol film is dipped in the dye solution and first stretched to obtain the first intermediate film. In the present invention, the hydrophobically modified polyvinyl alcohol film is consistent with the hydrophobically modified polyvinyl alcohol film describ...
Embodiment 1
[0074] Polyvinyl alcohol, glycerol, sodium lauryl sulfate and water are mixed to obtain a mixed solution; the mass ratio of polyvinyl alcohol, glycerol, sodium lauryl sulfate and water is 15:1.5:0.15 : 100, the degree of polymerization of the polyvinyl alcohol is 2600, and the degree of saponification is 99.7%.
[0075] The mixed solution obtained above was heated to 95° C., and the bubbles inside the heated mixed solution were removed by standing, and the mixed solution after the bubbles were removed was prepared into a polyvinyl alcohol film with a film thickness of 75 μm by a casting film method; The drying method in the cast film production method is infrared heating and drying, which is divided into two stages for infrared heating and drying. The drying temperature of the first stage is 90 ° C, and the drying time is 7 minutes; the drying temperature of the second stage is 150 ° C , The drying time is 1.5min.
[0076] Trimethylchlorosilane and trimethylolacetone are mixe...
Embodiment 2
[0082] Mix polyvinyl alcohol, glycerol, sodium lauryl sulfate and water to obtain a mixed solution; the mass ratio of polyvinyl alcohol, glycerol, sodium lauryl sulfate and water is 3:0.3:0.09 : 100, the degree of polymerization of the polyvinyl alcohol is 6000, and the degree of saponification is 99.7%.
[0083] The mixed solution obtained above was heated to 95°C, and the air bubbles inside the heated mixed solution were removed by standing in a vacuum, and the mixed solution after the bubbles were removed was prepared into a polyvinyl alcohol film with a film thickness of 20 μm by a casting film method; The drying method in the cast film-making method is air blast drying, and the drying temperature of the air blast drying is 40°C.
[0084] Mix n-octyltriethoxysilane and water to obtain a silane coupling agent solution; the mass ratio of n-octyltriethoxysilane and water is 30:100, and the pH value of the silane coupling agent solution for 11. The polyvinyl alcohol film pre...
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Abstract
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