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A kind of polyvinyl alcohol-based film and its production method and polarizing film prepared therefrom

A polyvinyl alcohol-based film and film technology, applied in the field of polarizing film, can solve the problems of low self-sufficiency of PVA film, and achieve the effects of ensuring optical consistency, reducing dimensional changes, and good optical consistency

Active Publication Date: 2020-06-05
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polarizers and PVA films are new materials that are in short supply in the country and are encouraged by the state. In the 13th Five-Year Plan, the country proposed that the localization rate of glass substrates, polarizers and PVA films in my country's LCD panels and upstream industrial chains should reach 30%. Above, the current localization rate of polarizers in my country is only 3-8%, while the self-sufficiency rate of PVA film is even lower.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This implementation discloses a polyvinyl alcohol-based film. The raw materials for preparation include the following components in parts by mass: 80-95 parts of PVA, 5-20 parts of EVOH, 5-25 parts of plasticizer, and 0.001-0.1 part of surfactant , 0.001-0.1 part of antioxidant; The degree of polymerization of PVA is 1500~3000, and the degree of alcoholysis is 97-100mol%l; The plasticizer is a polyhydroxy compound, preferably glycerin, purity ≥ 99.5%, and the antioxidant is selected from 1010 / 168 is a composition of 1:1; the polyvinyl alcohol film is annealed at 80°C, 50-95%RH for 2 hours, the crystallinity change of any area of ​​the polyvinyl alcohol film is less than or equal to 5%, and its size is stable. The dimensional change in any direction of the film during swelling can be reduced, the processing performance of the polyvinyl alcohol film can be improved, and the optical consistency of the obtained polyvinyl alcohol film is good.

[0043] Preferably, the prepa...

Embodiment 2

[0056] The difference between this embodiment and embodiment 1 is:

[0057] Step (3), followed by peeling and entering 18 drying rollers, the speed of the first 9 drying rollers is constant at 8m / min, the speed of the tenth roller is 8.1m / min, and the speed of the eleventh roller is 8.3m / min, Afterwards, the rotational speed of the rollers increases sequentially, and between adjacent drying rollers, the rotational speed increases by no more than 105%; the temperature of the roller surface is controlled at 80-95°C, and in this embodiment, the temperature of the roller surface is selected to be 90°C. From the beginning of one drying roll to the end of the last drying roll, the drying temperature of the roll surface remains constant.

Embodiment 3

[0059] The difference between this embodiment and embodiment 1 is:

[0060] Step (3), followed by peeling and entering 20 drying rolls, the speed of the first 10 drying rolls is constant at 6m / min, the speed of the 11th roll is 6.2m / min, and the speed of the 12th roll is 6.3m / min, After that, the rotation speed of the subsequent rollers increases sequentially, and the speed increase between adjacent drying rollers is not higher than 105%; the temperature of the roller surface is controlled at 80-95°C, starting from the first drying roller to the end of the last drying roller, The drying temperature of the roll surface decreases gradually, and the temperature difference between adjacent rolls is ≤1°C.

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Abstract

The invention relates to a composition of a high molecular compound, and particularly discloses a polyvinyl alcohol-based film, a production method thereof and a polarizing film produced from the polyvinyl alcohol-based film. The polyvinyl alcohol-based film comprises the following components as raw materials in parts by mass: 80-95 parts of PVA (polyvinyl alcohol), 5-20 parts of EVOH, 5-25 parts of a plasticizer, 0.001-0.1 part of surfactant and 0.001-0.1 part of an antioxidant; the polyvinyl alcohol-based film is annealed for 2 hours at the temperature of 80 DEG C and the RH (relative humidity) of 50-95%; the crystallinity change of any region of the polyvinyl alcohol-based film is smaller than or equal to 5%. The polyvinyl alcohol-based film is good in size stability, the size change in any direction of the film during swelling can be reduced, the processability of the polyvinyl alcohol-based film is enhanced, the obtained polyvinyl alcohol-based film is good in optical consistency, and bending spots generated during staining are less.

Description

technical field [0001] The invention relates to a polymer compound composition, in particular to a polyvinyl alcohol-based film, a manufacturing method thereof, and a polarizing film prepared therefrom. Background technique [0002] The polarizer is a key component of the liquid crystal panel. It is composed of a protective film such as triacetate cellulose (TAC) film or cellulose acetate butyrate (CAB) film on the polarizing film. Its main function is to convert natural light into polarized light. . Polarizers are mainly used for liquid crystal displays (LCDs). The application fields of LCDs were mostly small machines such as desktop computers and watches in the early stages of development. With the expansion of a wide range of automotive navigation systems, LCD TVs, personal telephones, and measuring equipment used indoors and outdoors, there is a huge demand for polarizers. [0003] Polarizing film is one of the important components of LCD. Generally, the polyvinyl alco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L23/08C08J5/18G02B5/30
CPCC08J5/18C08J2329/04C08J2423/08C08L29/04C08L2203/16G02B5/30C08L23/0846
Inventor 吕惠霞陈金耀胡腊梅
Owner CHINA PETROCHEMICAL CORP
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