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Method for enhancing inner protection film hydrophilicity of polaroid

A technology of protective film and polarizer, which is applied in the direction of polarizing elements, can solve the problems of increased production costs, achieve the effects of reducing the pressure of environmental protection treatment, improving uniformity, and reducing production costs

Active Publication Date: 2010-06-16
SHENZHEN SAPO PHOTOELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will increase the production cost

Method used

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  • Method for enhancing inner protection film hydrophilicity of polaroid
  • Method for enhancing inner protection film hydrophilicity of polaroid
  • Method for enhancing inner protection film hydrophilicity of polaroid

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Experimental program
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Effect test

Embodiment

[0067] Material Description:

[0068] Polarizer inner protective film: Triacetyl cellulose film (abbreviated as TAC film, the same below), produced by LOFO company in Germany;

[0069] Alkali: NaOH, commercially available, chemically pure;

[0070] Surfactant A: dodecyltrimethylammonium chloride, commercially available, chemically pure;

[0071] Surfactant B: cetyltrimethylammonium bromide, commercially available, chemically pure;

[0072] PVA (polyvinyl alcohol) film, product of Japan Kuraray Company, VF-P;

[0073] Adhesive: PVA aqueous solution (PVA-124: product of Kuraray Co.), concentration 5% (weight ratio).

[0074] Hydrophilic effect test:

[0075] Testing instrument: SL200A dynamic / static contact angle meter.

[0076] Detection method: In the environment of 25±1℃ / 60±5%RH, drop pure water on the surface of the film to be tested, and read the contact angle θ within 10 seconds (see Figure 6 , D is the film to be tested). 5 points were measured for each sample, an...

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Abstract

The invention relates to a method for increasing the hydrophilicity of a protecting film in a polaroid. In the process of alkali treatment of the protecting film, the method adds a quaternary ammoniumsalt cation surface active agent with the following chemical structural formula. In the formula, R1, R2, R3 and R4 are alkyl chains, wherein at least one carbon chain is less than or equal to 2, andat least one carbon chain is between 12 and 20; X is one of F, Cl, Br and I of halogen elements; the addition of the surface active agent is 0.001-1 percent; the concentration of the treatment fluid (alkali solution) is from 2-12 percent; the treatment temperature is from 26-45 DEG C; and the treatment time is from 60-110s. On the premise of guaranteeing the treatment effect of the hydrophilicity,the addition of the surface active agent can reduce the concentration of the alkali solution, reduce the treatment temperature (and / or shorten the treatment time); and simultaneously, the uniformityof the treatment is obviously increased, thus, the production cost is lowered, and the pressure of environmental protection treatment is lightened.

Description

technical field [0001] The invention belongs to a method for improving the hydrophilicity of a protective film inside a polarizer. Background technique [0002] Liquid crystal display (LCD) utilizes the optoelectronic properties of liquid crystal materials, has the advantages of low voltage, low power consumption, good display effect, easy to carry, wide application fields, etc., and occupies a dominant position in today's flat panel display field (LCD, PDP, rear projection) . [0003] The working principle of the LCD display is to change the deflection angle of the liquid crystal molecules through an external electric field, and this change can only be converted into visual information (digital, pattern, color, etc.) through the polarizing and analyzing functions of the polarizer. Therefore, the polarizer is one of the indispensable important components in the LCD. Polarizers account for 8-15% of the total production cost in the entire LCD display device. [0004] The pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
Inventor 钟伟宏
Owner SHENZHEN SAPO PHOTOELECTRIC
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