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A kind of purification method and purification device of liquid crystal aligning liquid waste liquid

A technology of liquid crystal alignment and purification method, applied in the field of purification method and purification device of liquid crystal alignment liquid waste liquid, can solve the problems of environmental pollution, increase of metal ions and the like

Active Publication Date: 2017-12-01
FUYANG XINYIHUA MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the first method can remove the moisture in the liquid crystal alignment liquid waste liquid, it may cause the increase of metal ions; although the second method can remove the moisture and metal ions in the liquid crystal alignment liquid waste liquid, it needs to be treated after the azeotropic The azeotropic solvent should be specially treated, otherwise it will cause environmental pollution

Method used

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  • A kind of purification method and purification device of liquid crystal aligning liquid waste liquid
  • A kind of purification method and purification device of liquid crystal aligning liquid waste liquid

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0065] Taking the 20Kg model as SE-1811 waste liquid crystal alignment liquid as an example, the performance parameters are shown in Table 1, wherein the viscosity is 57.62mPa.S, the solid content is 5.72%, the water content is 128600ppm and the metal ion content is 20ppm. The required range of standard performance parameters of SE-1811 target liquid crystal alignment liquid is shown in Table 2, wherein the viscosity is between 39.0±6.0mPa.S, the solid content is between 6.0±0.3%, the moisture content is <4000ppm and the metal ion content is ≤0.5 ppm.

[0066] name

[0067] Table 1

[0068] name

[0069] Table 2

[0070] Next, the SE-1811 liquid crystal alignment liquid waste liquid is purified through the purification method and purification device of the liquid crystal alignment liquid waste liquid provided by the present invention.

[0071] Step 1. Add 20Kg of SE-1811 liquid crystal alignment liquid waste liquid into the reaction chamber through the fe...

example 2

[0080] Taking 30Kg of AL22620 waste liquid crystal alignment liquid as an example, the performance parameters are shown in Table 4, wherein the viscosity is 32.32mPa.S, the solid content is 6.23%, the water content is 47200ppm and the metal ion content is 15ppm. The required range of standard performance parameters of AL22620 target liquid crystal alignment liquid is shown in Table 5, wherein the viscosity is between 26.0±4.0mPa.S, the solid content is between 6.0±0.5%, the moisture content is <10000ppm and the metal ion content is ≤0.5ppm.

[0081] name

Viscosity / mPa.S

Solid content

Moisture / ppm

Metal ion content / ppm

Liquid crystal alignment fluid waste

32.32

6.23

47200

15

[0082] Table 4

[0083] name

Viscosity / mPa.S

Solid content

Moisture / ppm

Metal ion content / ppm

Target liquid crystal alignment liquid

26.0±4.0

6.0±0.5

＜10000

≤0.5

[0084] table 5

[0085] Next, the AL22620 ...

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Abstract

The invention discloses a purification method of a waste liquid crystal alignment liquid and a purification device thereof. According to the purification method, mixed liquor is formed by adding a preset mass proportion of cation exchange resin into a waste liquid crystal alignment liquid, and the mixed liquor is stirred and vacuumized to remove moisture in the mixed liquor; metal ion in the mixed liquor and cation exchange resin undergo exchange adsorption to further form metal ion-adsorbed exchange resin; and the stirred and vacuumized mixed liquor undergoes filtration treatment to remove the metal ion-adsorbed exchange resin so as to obtain the purified liquid crystal alignment liquid. In comparison with the prior art, the purification method of the waste liquid crystal alignment liquid has the following advantages: moisture and metal ion in the waste liquid crystal alignment liquid can be effectively removed without producing extra waste liquid, and cost can be saved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a purification method and a purification device for liquid crystal alignment liquid waste liquid. Background technique [0002] Liquid crystal displays have been widely used in various aspects of social life, and liquid crystal alignment liquid is a key material in liquid crystal displays. Currently commonly used liquid crystal alignment liquids are generally composed of polyimides (polyimides, PI) mixed with solvents. The liquid crystal alignment liquid is mainly used to prepare the alignment film of the liquid crystal display, and it is used in a relatively large amount in the production process of the liquid crystal display. into the liquid crystal alignment liquid, so that the moisture and total metal ion content in the liquid crystal alignment liquid are too high, resulting in the disadvantages of uneven thickness, low voltage retention rate, high residual DC voltage and o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56
CPCC09K19/56
Inventor 王广涛夏治国王雪岚贾刚刚吴京玮
Owner FUYANG XINYIHUA MATERIAL TECH