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Method for analyzing concentration of PVA in bath solution in polarizing plate manufacturing process

A technology of manufacturing process and analysis method, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of reduced yield rate of finished products, poor appearance of polarizing plate, stability of unfavorable yield rate and improvement of yield rate, so as to improve the overall yield rate Effect

Pending Publication Date: 2020-05-08
恒美光电股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a small part of the PVA film will also dissolve after passing through the baths. As time goes by, PVA will accumulate more and more in each bath after dissolution, and then form small particles that adhere to the surface of the PVA film. Colloidal particles of indeterminate size will be produced when the layers are laminated, resulting in brown or red defects, resulting in poor appearance of the polarizing plate, resulting in a decrease in the yield of the finished product, which is not conducive to maintaining the stability of the yield rate and the goal of improving the yield rate in the mass production process.

Method used

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  • Method for analyzing concentration of PVA in bath solution in polarizing plate manufacturing process
  • Method for analyzing concentration of PVA in bath solution in polarizing plate manufacturing process
  • Method for analyzing concentration of PVA in bath solution in polarizing plate manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] PVA Concentration Analysis of Extension Tank

[0067] B. Configuration of extension solution

[0068] B1: Weigh 3g KI and 3g boric acid in a 150mL PE bottle with a four-digit analytical balance;

[0069] B2: Add 100g of ultrapure water to the PE bottle;

[0070] B3: Put KI and boric acid on a shaker to completely dissolve. The prepared extension solution is a 3% KI / 3% boric acid mixture, which can be stored for three months.

[0071] C. I 2 liquid configuration

[0072] C1: 3g KI, 3g boric acid and 1gI with a four-digit analytical balance 2 In 150mL PE bottle;

[0073] C2: Add 100g of ultrapure water to the PE bottle;

[0074] C3: Put KI, boric acid and I on a shaker 2 Completely dissolved, configured I 2 Liquid is 3%KI / 3%boric acid / 1%I 2 The mixture can be stored for three months.

[0075] (1) Make a calibration line: configure five extension solution standard solutions with different PVA concentrations

[0076] (a) Configuration of blank group samples:

[...

Embodiment 2

[0136] Fabrication of calibration curves for cleaning tanks

[0137] D. Configuration of cleaning solution

[0138] D1: Precisely weigh 2.5g KI and 3g boric acid in a 150mL PE bottle with a four-digit analytical balance;

[0139] D2: Add 100g of ultrapure water to the PE bottle;

[0140] D3: Put KI and boric acid on a shaker to completely dissolve. The prepared cleaning solution is a mixture of 2.5% KI / 3% boric acid, which can be stored for three months.

[0141] The configuration method of the cleaning solution standard solution with different PVA concentrations is the same as that of the extension solution standard solution in Example 1, just replace the extension solution in steps (a) to (e) with the cleaning solution, so no longer repeat.

[0142] Utilize the UV-Vis spectrometer to test the UV absorbance of the washing solution 1 standard solution with different PVA concentrations, and the absorbance data are listed in Table 3, taking the PVA concentration as the X axis...

Embodiment 3

[0144] Preparation of Calibration Lines for Dyeing Tanks

[0145] E. Configuration of staining solution

[0146] E1: 0.23g KI and 1.73g boric acid are placed in a 150mL PE bottle with a four-digit analytical balance;

[0147] E2: Add 1g I to this PE bottle 2 ;

[0148] E3: Add 100g of ultrapure water to the PE bottle;

[0149] E4: Put KI, boric acid and I on a shaker 2 Completely dissolved, the prepared staining solution is 0.23% KI / 1.73% boric acid / 1% I 2 The mixture can be stored for three months.

[0150] The method of configuring the dyeing solution standard solution with different PVA concentrations is the same as that of the extension solution standard solution in Example 1, just replace the extension solution in steps (a) to (e) with the staining solution, so it will not be described again.

[0151] Utilize the UV-Vis spectrometer to test the UV absorbance of the dyeing solution standard solution with different PVA concentrations, and the absorbance data are liste...

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Abstract

The invention, which relates to fields of quantitative analysis of PVA concentration by a UV method and measurement of PVA concentration in bath solution by a detection line method, discloses a methodfor analyzing the concentration of PVA in bath solution in a polarizing plate manufacturing process. The method specifically comprises the following steps: making a check line; to be specific, preparing at least five bath solution standard solutions with different PVA concentrations, measuring the UV absorptivity of each standard solution with the different PVA concentration, and making a check line by taking the PVA concentrations of the bath solution standard solutions as an X axis and the UV absorptivity as a Y axis; and analyzing the PVA concentration of an actual sample, measuring the UVabsorptivity of the actual sample, substituting the UV absorptivity of the actual sample into the manufactured checking line, and carrying out conversion to obtain the PVA concentration. The actual sample is a bath solution in an actual manufacturing process. According to the PVA concentration analysis method provided by the invention, the concentration of PVA in the bath solution is monitored and calculated through a linear equation obtained by the check line method, the defects of poor appearance of the polarizing plate and the like caused by colloidal particles generated during laminationafter the PVA concentration in the bath solution is excessively high and the PVA is separated out are overcome; and the overall yield of the polarizing plate is improved.

Description

technical field [0001] The invention relates to an analysis method for PVA concentration in bath liquids in a polarizing plate manufacturing process, in particular to an analysis method for quantifying the PVA concentration in each bath liquid by using a UV method and a calibration curve analysis method. Background technique [0002] In recent years, polarizers have been widely used in various liquid crystal displays and other display devices. Especially in recent years, with the rapid development of artificial intelligence, the application range of liquid crystal displays has become wider and wider. For a long time, the manufacturing methods of polarizing plates can be divided into dry stretching and wet stretching according to the process technology. In the wet manufacturing process, the PVA film is involved in a series of actions through various baths. The purpose of each bath solution is different, and the temperature and composition of the bath solution in different tan...

Claims

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Application Information

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IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 章娟郑尧中张良宝陈俊宏
Owner 恒美光电股份有限公司