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Method for testing content of N-methyl pyrrolidone in liquid crystal

A technology of methylpyrrolidone and its determination method, which is applied in the field of organic matter analysis, can solve problems such as uncontrollable polymerization, poor alignment of liquid crystals, and failure to find test methods, etc., and achieve the effect of reducing the risk of process abnormalities

Active Publication Date: 2015-07-22
SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the drip irrigation technology is used to drip into the liquid crystal, NMP dissolves from the PI film into the liquid crystal, which may cause an uncontrollable reaction to the polymerization of reactive monomers in the manufacturing process, which in turn leads to poor alignment of the liquid crystal. It is necessary to monitor the residual NMP content, but no relevant test method has been found yet

Method used

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  • Method for testing content of N-methyl pyrrolidone in liquid crystal
  • Method for testing content of N-methyl pyrrolidone in liquid crystal
  • Method for testing content of N-methyl pyrrolidone in liquid crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First prepare the standard sample solution, and establish the working curve according to the chromatographic peaks of each component measured by the standard sample solution. Specifically refer to the following steps:

[0036] (1) Take N-methylpyrrolidone (hereinafter referred to as NMP) with a mass of 0.15242g and A-type liquid crystal with a mass of 9.05692g on an electronic balance, use the A-type liquid crystal as a solvent, and NMP as a solute to obtain a concentration of 16.551g / kg of standard mother liquor.

[0037] With above-mentioned A-type liquid crystal as solvent, the standard mother liquor that obtains concentration is 16.551g / kg is carried out step by step dilution, obtains the standard solution of four groups of known concentrations (concentration is respectively 0.1741g / kg, 0.3515g / kg, 0.7849g / kg and 1.5945g / kg); It should be noted that in the process of dilution, it should be ensured that the concentration range of the four groups of standard soluti...

Embodiment 2

[0058] In the description of Embodiment 2, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between embodiment 2 and embodiment 1 is that the content of NMP in the B type liquid crystal in another liquid crystal panel is tested with the method in embodiment 1, 4 groups of parallel experiments, the chromatographic peak of NMP is the same as that of the same group The area ratio of the internal standard component peaks of the standard solution is shown in Table 4.

[0059] Table 4

[0060] test group

[0061] Through linear fitting, obtain the working curve equation of the present embodiment to be y=9.3547x-0.1264, wherein R 2 = 1, such as Figure 6 shown.

[0062] Calculate the NMP content in the B-type liquid crystal sample, conduct 6 parallel experiments, and the test results are shown in Table 5.

[0063] table 5

[0064]

[0065] The same method as in Example 1 was a...

Embodiment 3

[0070] In the description of Embodiment 3, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between embodiment 3 and embodiment 1 is that the content of NMP in the C type liquid crystal in another liquid crystal panel is tested with the method in embodiment 1, and the chromatographic peak of NMP is identical with the internal standard of the same group of standard solutions The area ratio of the component peaks, 4 groups of parallel experiments, as shown in Table 7.

[0071] Table 7

[0072]

[0073] Through linear fitting, obtain the working curve equation of the present embodiment to be y=5.4973x-0.0811, wherein, R 2 =0.9994, such as Figure 7 shown.

[0074] Calculate the NMP content in the C-type liquid crystal sample, and conduct 6 parallel experiments. The test results are shown in Table 8.

[0075] Table 8

[0076]

[0077] The same method as in Example 1 was used to car...

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Abstract

The invention discloses a method for testing content of N-methyl pyrrolidone in liquid crystal. The method comprises the following steps: A, respectively testing chromatography peak values of different components in a series of standard sample liquids by using a gas chromatograph-mass spectrometer, pre-selecting an internal standard component peak from liquid crystal chromatography peaks of each group of the standard solutions, calculating a standard area ratio of N-methyl pyrrolidone chromatographic peaks of the same group of the standard sample liquids and the internal standard component peak, and drawing working curves of the concentration of N-methyl pyrrolidone of different groups of the standard sample liquids and the standard area ratio; B, testing by using the gas chromatograph-mass spectrometer under same detection conditions so as to obtain chromatographic peak graphs of different components of a liquid to be tested, calculating the area ratio of corresponding internal standard component peaks of N-methyl pyrrolidone and liquid crystal chromatographic peaks of the liquid to be tested, and checking corresponding content of N-methyl pyrrolidone in the working curves according to the area ratio. The method is simple and feasible, the content of residual N-methyl pyrrolidone in liquid crystal can be accurately tested, and reliable data can be provided for preparation process monitoring.

Description

technical field [0001] The invention belongs to the technical field of organic matter analysis, and in particular relates to a method for determining the content of N-methylpyrrolidone in liquid crystals by using gas chromatography-mass spectrometry. Background technique [0002] Thin film transistor-liquid crystal display (TFT-LCD for short) is currently the only comprehensive performance that catches up with and surpasses the cathode ray tube (Cathode Ray Tube) in terms of brightness, contrast, power consumption, life, volume and weight. Tube (referred to as CRT) display device, it has excellent performance such as good mass production characteristics and high degree of automation, which makes the development space broad and quickly becomes the current mainstream product. It mainly consists of TFT substrate (thin film transistor array substrate), CF substrate (color filter array substrate) and liquid crystal sandwiched between the two substrates to form a liquid crystal pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
Inventor 巫景铭张维维敖雪丽王俐何小波朱洪辉陆金德徐蕊
Owner SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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