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Yellow pigment for color liquid crystal filter and preparation method thereof

A technology of yellow pigment and color filter, which is applied in the field of yellow pigment and its preparation, can solve the problems of not being able to reach liquid crystal color filters, and achieve the effects of high grayscale, high contrast, good fluidity and stability

Inactive Publication Date: 2011-01-19
SHANGHAI JIEHONG PIGMENT TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current high specific surface area pigments are more transparent, have higher color strength, and greener shades compared with covering pigments, they still fall short of liquid crystal color filters in terms of transparency, contrast, and fluidity. requirements

Method used

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  • Yellow pigment for color liquid crystal filter and preparation method thereof
  • Yellow pigment for color liquid crystal filter and preparation method thereof
  • Yellow pigment for color liquid crystal filter and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0064] The preparation method of the yellow pigment used for the color liquid crystal color filter that the present invention relates to mainly comprises the following operations:

[0065] A, taking 2-methyl-8-aminoquinoline and tetrachlorophthalic anhydride as the basic raw material synthetic structural formula is the yellow pigment crude product of compound I;

[0066] B. Pigmentation processing of crude yellow pigment.

[0067] The synthetic method of yellow pigment crude product is roughly as follows:

[0068] a. In trichlorobenzene or other inert high-boiling solvents, add 2-methyl-8-aminoquinoline and tetrachlorophthalic anhydride, anhydrous zinc chloride;

[0069] b. Heating to a boiling state and keeping boiling for several hours;

[0070] c. Add dimethylformamide, stir and reflux for about 1 hour;

[0071]d. Then filter while hot, and wash with dimethylformamide;

[0072] e. Finally, wash with ethanol, and dry the filter cake to obtain the crude yellow pigment who...

Embodiment 1

[0090] Synthesis of Compound I

[0091] In a reaction kettle, add 3000 parts of trichlorobenzene, slowly add 158 parts of 2-methyl-8-aminoquinoline, 600 parts of tetrachlorophthalic anhydride, and 50 parts of zinc chloride while stirring. The temperature is raised to boiling temperature, the water produced by the reaction is discharged from the reactor through the condenser, and the trichlorobenzene is condensed and then returned to the reactor. Keep boiling for 4 hours, add 600 parts of dimethylformamide DMF to lower the reflux temperature to 175°C, then filter at 150-175°C, continue to wash with 1500 parts of dimethylformamide DMF, and finally wash with 500 parts of ethanol, filter The cake was dried to obtain the crude product of yellow pigment, that is, compound I.

[0092] Pigmentation treatment of crude pigment

[0093] a) Pigment pre-grinding

[0094] In a 10-square ball mill, add steel balls accounting for 75% of the volume, the yellow pigment crude product of 1000 ...

Embodiment 2

[0100] Synthesis of Compound I

[0101] In a reaction kettle, add 3000 parts of trichlorobenzene, slowly add 158 parts of 2-methyl-8-aminoquinoline, 800 parts of tetrachlorophthalic anhydride, and 60 parts of zinc chloride while stirring. The temperature is raised to boiling temperature, the water produced by the reaction is discharged from the reactor through the condenser, and the trichlorobenzene is condensed and then returned to the reactor. Keep boiling for 5 hours. Filter, wash with 2,000 parts of 160°C dimethylformamide DMF, and finally wash with 500 parts of ethanol, and dry the filter cake to obtain a crude yellow pigment that is Compound I.

[0102] Pigmentation treatment of crude pigment

[0103] a) Pigment pre-grinding

[0104] In a 10 cubic meter ball mill, add steel balls accounting for 75% of the volume, the yellow pigment crude product of 1500 kilograms of example 1, and 500 kilograms of sodium sulfate. Start the grinder to grind for 40 hours, and control t...

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Abstract

The invention relates to a yellow pigment for a color liquid crystal filter, which consists of at least two compounds. The compounds include a compound I and a compound II. A preparation method for the pigment comprises the following procedures of: A, synthesizing a yellow pigment crude product of which the structural formula is the compound I by 2-methyl-8-aminoquinoline and tetrachlorophthalic anhydride serving as basic raw materials; and B, performing pigment processing on the yellow pigment crude product. The pigment processing procedure comprises the following steps of: 1, pre-grinding the yellow pigment crude product; and 2, performing pigment postprocessing on the pre-ground yellow pigment crude product. The yellow pigment prepared by the method has high transparency, brightness and contrast, and has good fluidity in a liquid dispersoid for coloring the color filter.

Description

technical field [0001] The invention relates to the technical field of color filter pigments, in particular to a yellow pigment used in color liquid crystal color filters and a preparation method thereof. Background technique [0002] With the development of liquid crystal display technology, the demand for pigments used in color filters has increased significantly. The quality of pigments used in color filters has higher requirements, not only requiring high light resistance and heat resistance, but also high transparency, high contrast and high brightness. The colorant dispersion made of pigments has good fluidity and storage stability, which ensures smooth coating and processing of color filters to obtain high-quality color filters. Pigments produced by conventional processing methods are difficult to meet the above quality requirements. [0003] A kind of pigment in the prior art, the index number of its pigment is C.I.Pigment Yellow 138 (abbreviated as P.Y.138), and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/22C09B67/20
Inventor 张东江张合杰周璐璐
Owner SHANGHAI JIEHONG PIGMENT TECH DEV
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