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A method for evaluating the quality of pva optical films

An optical film and quality technology, applied in the field of polarizers, can solve the problems of inability to timely feedback, hysteresis, and troublesome operation, and achieve the effect of improving production efficiency, simple operation and reliable results.

Active Publication Date: 2022-08-02
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

The indicators for directly evaluating the quality of PVA optical films include stretching ratio, tensile strength, light transmittance, haze, etc., but these quality indicators can only reflect the performance of a certain aspect of PVA film, and cannot reflect the microstructure of PVA optical film. The quality of polarizer production is not completely correlated with these indicators, especially the uniformity of dyeing after stretching
At present, the front-end PVA optical film is divided into high-grade, mid-range, low-end and inferior products according to the performance of polarizers produced in the downstream industry. However, this evaluation method is cumbersome to operate and has a lag, and cannot provide timely feedback.

Method used

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  • A method for evaluating the quality of pva optical films
  • A method for evaluating the quality of pva optical films
  • A method for evaluating the quality of pva optical films

Examples

Experimental program
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Embodiment 1

[0026] In order to verify the reliability of the method of the present invention, several PVA optical films of different qualities (superior grade I, superior grade II, superior grade III, mid-end grade I, mid-end grade II, mid-end grade III, low-end grade grade Product I, low-end product II, inferior product I, inferior product II), respectively, carry out quality assessment according to the method of the present invention, and the specific steps are as follows:

[0027] Step 1. Cut a number of film samples with a mass of 5.0g to be evaluated, put them in an environment with a temperature of 25°C and a humidity of 55RH% for 12 hours, and then put them into 30°C water for different times of swelling. The swelling time is t i (i=0, 1, 2, 3...) are 0s, 5s, 10s, 15s, 20s, 25s, 30s, 40s, 50s, 60s, 70s, 90s, 100s, 120s, 150s, 200s, 250s, 300s .

[0028] Step 2. After the swelling is completed, take out the film and absorb the moisture on the film surface, then add it to distilled...

Embodiment 2

[0040] Take two samples of unknown quality and evaluate them as follows:

[0041] Step 1. Cut a number of film samples with a mass of 5.0g to be evaluated, put them in an environment with a temperature of 25°C and a humidity of 55RH% for 12 hours, and then put them into 30°C water for different times of swelling. The swelling time is t i (i=0, 1, 2, 3...) are 0s, 15s, 20s, 25s, 30s, 40s, 50s, 60s, respectively.

[0042] Step 2. After the swelling is completed, take out the film and absorb the moisture on the film surface, then add it to distilled water, heat to 80°C to fully dissolve the film, and then test the plasticizer glycerin concentration in the solution according to GB / T 13216.6-91 , so as to obtain swelling t i Remaining glycerol mass in the film after time m i , and calculate the swelling t i+1 The mass of dissolved glycerol in the film accounts for the percentage of the initial glycerol mass in the film at time W i+1 (unit is %): W i+1 =(m 0 -m i+1 ) / m 0 . ...

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Abstract

The invention discloses a method for evaluating the quality of a PVA optical film. The binding state of PVA in the film, and then evaluate the quality of PVA optical film. The method of the invention has simple operation and reliable results.

Description

technical field [0001] The invention belongs to the field of polarizers, and in particular relates to a method for evaluating the quality of a PVA optical film. Background technique [0002] Apple's iPhone 12 series this year is equipped with OLED screens, which have higher color contrast and near-perfect color accuracy than LCD screens, and are almost indistinguishable to the naked eye. The core components of display panels contain polarizers, and polyvinyl alcohol (PVA) optical films are key materials for producing polarizers. [0003] The formed PVA optical film is pre-swollen, washed with water, dyed with iodine, uniaxially stretched, and cured with boric acid to form a polarizing film, and then a protective film is attached on both sides to obtain a polarizing film. The production process of PVA optical film is as follows: PVA, plasticizer (usually glycerin) and additives are added to water to prepare a certain concentration of PVA stock solution, which is defoamed and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 吴福胜唐成宏吴云柱向学毅刘密密陈玉春丁丽
Owner ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD