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Heat treatment method of polyvinyl alcohol optical film

A heat treatment method and polyvinyl alcohol technology, applied in optics, optical components, instruments, etc., can solve the problems of uneven crystallization of polyvinyl alcohol optical films, reduce the performance of polarizers, and affect the quality of the film surface, so as to reduce surface concave Pits and bumps, eliminating unevenness, improving yield and performance

Active Publication Date: 2016-07-06
ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the inhomogeneity of the temperature of the hot air as the heat source itself will lead to the inhomogeneity of the crystallization of the polyvinyl alcohol optical film, so that wrinkles are prone to appear in the subsequent swelling, dyeing and stretching, resulting in dyeing defects, which seriously reduces the polarizer. performance on large, large displays
Using hot air as a heat source will also lead to the precipitation of plasticizers and surfactants inside the film, affecting the quality of the film surface

Method used

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  • Heat treatment method of polyvinyl alcohol optical film
  • Heat treatment method of polyvinyl alcohol optical film
  • Heat treatment method of polyvinyl alcohol optical film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] With degree of polymerization 2600, degree of saponification being 99.92mol% PVA resin 500Kg and plasticizer glycerin 50Kg, surfactant coconut oil diethanolamide 2Kg, antioxidant 1098 are dissolved in deionized water altogether 1Kg and be formulated with mass concentration as 30% Cast film stock solution.

[0031] The cast film stock solution is degassed and extruded by a twin-screw extruder to the hanger-shaped die, cast on a casting drum at 85°C and dried to form a preformed polyvinyl alcohol optical film with a thickness of 75 μm. After leaving the casting drum The volatile content is 25%. The preformed polyvinyl alcohol optical film continued to be dried through a set of drying guide rollers with decreasing temperature, and the volatile content after leaving the drying guide rollers was 12%.

[0032] The polyvinyl alcohol optical film is subjected to two-stage heat treatment: firstly, the polyvinyl alcohol optical film is dried with hot air in a heat treatment oven...

Embodiment 2

[0036] With degree of polymerization 1700, degree of saponification being 99.92mol% PVA resin 500Kg and plasticizer glycerin 50Kg, surfactant coconut oil diethanolamide 2Kg, antioxidant 1098 are dissolved in deionized water altogether 1Kg and are formulated with mass concentration as 30% Cast film stock solution.

[0037] The cast film stock solution is degassed and extruded by a twin-screw extruder to the hanger-shaped die, cast on a casting drum at 85°C and dried to form a preformed polyvinyl alcohol optical film with a thickness of 75 μm. After leaving the casting drum The volatile content is 23%. The preformed polyvinyl alcohol optical film continued to be dried through a set of drying guide rollers with decreasing temperature, and the volatile content after leaving the drying guide rollers was 11%.

[0038] A two-stage heat treatment process is performed on the polyvinyl alcohol optical film: first, the polyvinyl alcohol optical film is dried with hot air in a heat treat...

Embodiment 3

[0042] With degree of polymerization 2600, degree of saponification being 99.92mol% PVA resin 500Kg and plasticizer glycerin 50Kg, surfactant coconut oil diethanolamide 2Kg, antioxidant 1098 are dissolved in deionized water altogether 1Kg and be formulated with mass concentration as 30% Cast film stock solution.

[0043] The cast film stock solution is degassed and extruded by a twin-screw extruder to a hanger-shaped die, cast on a casting drum at 85°C and dried to form a preformed polyvinyl alcohol optical film with a thickness of 40 μm. After leaving the casting drum The volatile content is 21%. The preformed polyvinyl alcohol optical film continued to be dried through a set of drying guide rollers with decreasing temperature, and the volatile content after leaving the drying guide rollers was 11%.

[0044] The polyvinyl alcohol optical film is subjected to two-stage heat treatment: firstly, the polyvinyl alcohol optical film is dried with hot air in a heat treatment oven. ...

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Abstract

The invention discloses a heat treatment method of a polyvinyl alcohol optical film. The heat treatment method is characterized in that heat treatment is performed on the polyvinyl alcohol optical film in manners of hot air treatment and silicone oil bath treatment; the temperature of hot air treatment is 40-100 DEG C and the time lasts for 1-5 minutes and temperature of silicone oil bath treatment is 50-150 DEG C and the time lasts for 1-5 minutes. According to the polyvinyl alcohol optical film product obtained through the method of the invention, swelling capacities in a TD direction and an MD direction are 121-118% and 120-117%; a ratio of TD / MD is 1.007-1.01; a central phase difference in the width direction of the film is 25-40nm; and a haze value is smaller than or equal with 0.2. After swelling and dyeing of a base film, wrinkle probability which is generated after 3-5 times of stretching is remarkably reduced, and the number of insufficient-dyed points on a prepared polarizing film is smaller than or equal with 7 per 1000m<2>. Yield and use performance of a polarizer are greatly improved.

Description

technical field [0001] The invention relates to a heat treatment method of a polyvinyl alcohol optical film, which is suitable for the production of polarizers. Background technique [0002] Polarizer is one of the three major raw materials of LCD. With the popularity of LCD products in recent years, polarizer has been widely used in modern liquid crystal display products: liquid crystal flat-panel TVs, computer monitors, mobile phone screens and other digital products. With the development of large-scale LCD flat-panel TV screens, the polarizer as its main raw material is also required to develop in a wide direction, which has strict requirements on the number of dyeing defects per unit area, optical defects, and shrinkage internal stress on the polarizer. [0003] The polarizer is made by swelling polyvinyl alcohol optical base film in iodine or dichroic dye bath, dyeing, stretching, setting and compounding TAC film. In order to obtain better orientation to enhance the po...

Claims

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Application Information

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IPC IPC(8): G02B1/12G02B5/30
CPCG02B1/12G02B5/3033
Inventor 吴福胜许宏平唐成宏徐冬生陈争艳潘晓明向学毅施红生闫昌斌朱宝华
Owner ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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