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Preparation method of polyvinyl alcohol polarizing film for TFT

A technology of polyvinyl alcohol and polarizing film, applied in applications, optical components, household appliances, etc., can solve the problems of long process, complex production process, high comprehensive cost, etc., achieve excellent optical performance, moisture resistance and temperature resistance, and improve tensile strength The effect of magnification and lowering the melting temperature

Pending Publication Date: 2021-04-30
合肥德瑞格光电科技有限公司
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Problems solved by technology

The production process of this method is complicated, the process is long, there are many guide rollers in contact with the film, and there are many quality control points during production, resulting in low yield rate of polarizers and high overall cost.
Both patents CN103724642A and CN107619566A disclose a method for preparing a polyvinyl alcohol polarizer. In both patents, iodine is used as a dye and an aqueous solution of polyvinyl alcohol is mixed uniformly to form a film. Although this method is simple, there are two Common defect: When the iodine-containing polyvinyl alcohol solution is extruded and defoamed, the iodine will volatilize from the extruded exhaust port, resulting in a significant decrease in the transmittance of the film after cast film formation, and the degree of polarization of the obtained polarizer , Poor optical properties; iodine, as a dichroic substance, is easy to sublimate and unstable at high temperatures, resulting in poor temperature and humidity resistance of polarizers
The above defects cause the performance of the obtained polarizer to fail to meet the application requirements of TFT display screens

Method used

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  • Preparation method of polyvinyl alcohol polarizing film for TFT

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Embodiment 1

[0026] This embodiment prepares polyvinyl alcohol polarizing film for TFT according to the following steps:

[0027] Step 1, take by weighing PVA 800kg (polymerization degree is 2600, alcoholysis degree 99.97%), PVA200kg (polymerization degree is 550, alcoholysis degree 99.1%), plasticizer glycerol 120kg, surfactant dodecylbenzene Sodium sulfonate 0.5kg and a certain amount of pure water (resistivity 15MΩ·cm) are fully stirred in the dissolution kettle until they are evenly mixed, and while stirring, feed inert gas nitrogen into the dissolution kettle to remove oxygen, so that the prepared Polarizers do not yellow.

[0028] Step 2. Pressurize the dissolution tank and raise the temperature to 140° C. and 0.5 MPa to dissolve polyvinyl alcohol to obtain mixed solution A, wherein the mass concentration of polyvinyl alcohol is 36%.

[0029] Step 3, configure the mixed solution of 1-phenylazo-2-naphthol dye and boric acid (containing 0.4kg of dye and 0.6kg of boric acid) in the aux...

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Abstract

The invention discloses a preparation method of a polyvinyl alcohol polarizing film for a TFT. The method comprises the following steps: adding a non-iodine dye into a polyvinyl alcohol solution, carrying out extruding and defoaming, carrying out casting to form a film, carrying out dry stretching, carrying out hot air setting and drying, and carrying out trimming and rolling to obtain the polyvinyl alcohol polarizing film. By adopting the non-iodine dye and proper technological conditions, compared with an iodine polarizing film, the prepared polarizing film has better optical performance and humidity and temperature resistance, and can meet the application requirements of outdoor high-temperature and high-humidity environments and TFT display screens.

Description

technical field [0001] The invention relates to the technical field of polarizer preparation, in particular to a preparation method of a polyvinyl alcohol polarizing film for TFT. Background technique [0002] LCD / OLED displays are not only widely used in indoor displays such as TVs and notebook computers, but also in outdoor fields such as mobile phones, vehicle displays, outdoor electronic signs, and outdoor cameras. Therefore, in order for the display to maintain good performance under outdoor conditions, the polarizer, which is a key material for LCD / OLED display, needs to have excellent temperature and humidity resistance. [0003] At present, the production method of polarizer is to mix water, polyvinyl alcohol, plasticizer and auxiliary agent uniformly in a certain proportion, then cast into a film and dry to obtain a polyvinyl alcohol original film. Dyeing, washing, stretching, complementary color drying, and lamination of functional films on the upper and lower sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D11/00C08J5/18C08L29/04C08K5/053C08K3/38C08K5/23C08K13/02
CPCB29D11/00788B29D11/0073C08J5/18C08J2329/04C08J2429/04C08K5/053C08K3/38C08K5/23C08K13/02
Inventor 潘晓明徐学斌李家鸣高申保吴福胜陈喜成杨阳司家清
Owner 合肥德瑞格光电科技有限公司
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