Method for measuring dissolution amount of PVA optical film

An optical film and solution technology, applied in the field of polarizers, can solve the problems of polluting polarizer dyeing tanks, uneven dyeing of PVA films, and failure to measure the dissolution of PVA optical films.

Pending Publication Date: 2020-06-26
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

However, during the manufacturing process of polarizing film, PVA film will have dissolved substances, such as added additives and small molecules in PVA film, which will pollute the downstream dyeing tank for polarizer production
Moreover, if too many small

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0021] Example 1

[0022] Step 1. Preparation of PVA standard solution: Weigh 20mg of PVA, add it to a 100mL volumetric flask, distilled water to make 100mL, prepare a PVA solution with a concentration of 200mg / L, and use it as a mother liquor to prepare a concentration of 10mg / L to A series of PVA standard solutions within the range of 150mg / L (150mg / L, 120mg / L, 100mg / L, 80mg / L, 60mg / L, 50mg / L, 40mg / L, 30mg / L, 20mg / L, 10mg / L).

[0023] Step 2. Add 30.0g of boric acid to 1000mL of water and shake well to obtain a 30.0g / L boric acid solution; add 10.0g of iodine and 25.0g of potassium iodide to 1000mL of water and shake well to obtain an iodine-potassium iodide solution, where the iodine concentration is 10.0g / L, the concentration of potassium iodide is 25.0g / L; mix the boric acid solution and the iodine-potassium iodide solution in a volume ratio of 3:1 and shake to obtain a color solution;

[0024] Step 3. Drawing the standard relationship curve between absorbance and PVA concen...

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PUM

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Abstract

The invention discloses a method for measuring the dissolution amount of a PVA (Polyvinyl Alcohol) optical film, which comprises the following steps: soaking a PVA optical film to be measured in waterto prepare an extracting solution to be measured; taking a mixed solution of a boric acid solution and an iodine/potassium iodide solution as a chromogenic solution, adding the chromogenic solution into the to-be-detected extracting solution, then determining the absorbance, and obtaining the concentration of PVA in the to-be-detected extracting solution according to the standard relation curve of the absorbance and the concentration of PVA, thereby calculating the dissolution amount of the PVA optical film. According to the method, trace detection of PVA in the solution can be simply and efficiently realized, the dissolution amount of the PVA optical film can be quickly measured, and the method has guiding significance for evaluating the product quality of the PVA optical film.

Description

technical field [0001] The invention belongs to the field of polarizers, and in particular relates to a method for measuring the dissolution amount of a PVA optical film. Background technique [0002] Polarizers are the core components for the production of LCD panels, and polyvinyl alcohol (PVA) optical films are key materials for the production of polarizers. Nowadays, the demand for large-size liquid crystals is increasing, and more and more new products are being developed, such as the mainstream of next-generation displays: Active Matrix Organic Light-Emitting Diode (AMOLED) displays, which are flexible and ultra-thin , which has very strict requirements on the raw materials of each link, especially the PVA optical film in the upstream of the industrial chain. [0003] The existing method for producing polarizers is to pre-swell the formed PVA film, dye it with iodine, uniaxially stretch it, and cure it with boric acid to form a polarizer film, and then attach a triace...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/30
CPCG01N21/31G01N1/30
Inventor 唐成宏吴云柱向学毅刘密密陈玉春
Owner ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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