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Polyethylene alcohol polymer film and production method

A technology of polymer film and polyvinyl alcohol, which is applied in the field of polyvinyl alcohol polymer film and its manufacture, can solve the problems of increasing the risk of film fracture, increasing the surface roughness of the air contact surface, and corrugation of the film surface, achieving Effects of increasing yield and yield, avoiding staining and warping, and improving heating efficiency

Inactive Publication Date: 2015-05-20
CHANG CHUN PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the previous blowing method often caused uneven temperature distribution due to the flow of air, resulting in ripples or wrinkles on the surface of the film, or increased air particles, which increased the surface roughness of the air contact surface
This further increases the risk of film breakage and uneven dyeing in the subsequent stretching process, and even affects the application of warping polarizers.

Method used

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  • Polyethylene alcohol polymer film and production method
  • Polyethylene alcohol polymer film and production method
  • Polyethylene alcohol polymer film and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Add polyvinyl alcohol polymer resin (100 parts by weight) with a degree of polymerization of 2400 and a degree of alkalinity of 99.9% and 11 parts by weight of glycerin into water and heat up to 100 ° C, stir and dissolve to adjust the concentration to 25 parts by weight of polyvinyl alcohol Polymer aqueous solution (polyvinyl alcohol casting solution), after using a filter to filter the aqueous solution, and then using a gear pump and a T-die coater, the polyvinyl alcohol casting solution is cast to a 4-meter-wide heating space A casting drum, wherein the speed of the casting drum is 4 meters per minute (m / min), and the temperature is 95°C. The heating space is divided into a preheating zone, a heating zone and a buffer zone from the casting place of the polyvinyl alcohol casting solution to the peeling off of the polyvinyl alcohol polymer film, and each zone occupies a 90-degree zone of the casting drum. Using a wavelength conversion heater (NGK INSULATORS,LTD.) with ...

Embodiment 2

[0056] Production and evaluation of polyvinyl alcohol-based polymer films were carried out in the same manner as in Example 1, except that the speed of the casting drum was 6 m / min. Other analysis data are shown in Table 1 below.

Embodiment 3

[0058] Production and evaluation of polyvinyl alcohol-based polymer films were carried out in the same manner as in Example 1, except that the speed of the casting drum was 8 m / min. Other analysis data are shown in Table 1 below.

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Abstract

The invention provides a polyethylene alcohol polymer film provided with a first surface and a second surface, which are opposite to each other. The surface roughness of the first surface is A, and the surface roughness of the second surface is B, and the ratio of the B / A is in a range from 0.1 to 5.The surface roughness B is smaller than 300nm. The polyethylene alcohol polymer film is advantageous in that the good polarization degree can be achieved during the polarizer production process, and the generation of the color spots can be prevented. The invention also provides the production method of the polyethylene alcohol polymer film.

Description

technical field [0001] The present invention relates to a polyvinyl alcohol polymer film and a manufacturing method thereof, more specifically, to a manufacturing method of a polyvinyl alcohol polymer film that does not use hot air during the manufacturing process. Background technique [0002] The polarizer is to polarize the natural light that is generally not polarized and convert it into polarized light. LCD liquid crystal display is to use this kind of polarized light, coupled with the twisting characteristics of liquid crystal molecules, to control the passage of light. With the wide application of liquid crystal displays, the market demand for polarizers has also increased accordingly. Polarizers mainly use polyvinyl alcohol (PVA) polymer film as a polarizing substrate, so the quality of PVA polymer film will directly affect the use effect of polarizers. [0003] When preparing polarizers, polyvinyl alcohol is usually made into a film first, and then the film is str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08J5/18
CPCB29D7/01C08J5/18C08L29/04G02B5/30
Inventor 白峻铭
Owner CHANG CHUN PETROCHEMICAL CO LTD
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