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WO2020199463A1 - 颜料分散液的制备方法 - Google Patents

颜料分散液的制备方法 Download PDF

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Publication number
WO2020199463A1
WO2020199463A1 PCT/CN2019/101896 CN2019101896W WO2020199463A1 WO 2020199463 A1 WO2020199463 A1 WO 2020199463A1 CN 2019101896 W CN2019101896 W CN 2019101896W WO 2020199463 A1 WO2020199463 A1 WO 2020199463A1
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pigment
organic framework
covalent organic
preparing
pigment dispersion
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PCT/CN2019/101896
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English (en)
French (fr)
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查宝
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深圳市华星光电技术有限公司
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
    • C08G12/04—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
    • C08G12/06—Amines
    • C08G12/08—Amines aromatic
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials

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  • the invention relates to the field of display technology, in particular to a method for preparing a pigment dispersion.
  • TFT-LCD Thin Film Transistor Liquid Crystal Display
  • a liquid crystal display panel is composed of a color filter (CF) substrate, a TFT array substrate, a liquid crystal (LC) sandwiched between the color filter substrate and the TFT array substrate, and a sealant; its molding process Generally include: front-end array process and CF process (thin film, yellow light, etching and stripping), middle-end cell process (TFT array substrate and CF substrate bonding) and back-end module assembly (Module) Process (drive IC and printed circuit board pressing);
  • the front Array process is mainly to form TFT substrates to control the movement of liquid crystal molecules;
  • the front CF process is mainly to form CF substrates;
  • the middle cell process is mainly to form TFT substrates and CF Liquid crystals are added between the substrates;
  • the subsequent module assembly process is mainly to drive the integration of IC pressing and the printed circuit board, and then drive the liquid crystal molecules to rotate and display images.
  • the CF substrate is the main device used by the LCD to realize color display, and its basic composition usually includes: a glass substrate, a black matrix (Black Matrix, BM), a color filter layer, and so on.
  • the color filter layer mainly achieves the effect of color display through color photoresist.
  • the light emitted by the backlight is modulated by liquid crystal molecules and enters the CF substrate, and passes through the red (R) photoresist and green photoresist of the color filter layer on the CF substrate.
  • the light filtering function of the (G) photoresist and the blue (B) photoresist respectively display three kinds of light of red, green and blue, and the photoresists of different colors respectively transmit the light of the corresponding color bands, thereby realizing the color display of the display.
  • the manufacturing method of the color filter layer in TFT-LCD technology is mainly based on the pigment dispersion method.
  • the color filter layer is mainly composed of phthalocyanine, azo, anthraquinone pigments dispersed in the resin, and through coating , Exposure, development and other processes to form R/G/B photoresist patterns.
  • these pigments have poor solubility in organic solvents.
  • the PGMEA propylene glycol monomethyl ether ester
  • the particulate pigments have scattering, which can affect the brightness and LCD brightness.
  • the current pigment color resist dye (Dye), which can effectively solve the problem of solubility and dispersibility, which is beneficial to improve the brightness and contrast of LCD.
  • Dye the current pigment color resist dye
  • the thermal stability of dyes is poor, and it is difficult to meet the thermal process of the LCD process (usually the highest temperature is 230 °C).
  • Many dyes undergo thermal cracking due to poor stability during the thermal process, which affects the color of the color filter layer. The degree of influence is great.
  • the current methods of preparing pigments are all obtained through the "top-down” approach, that is, through physical methods to achieve the grinding and dispersion of large particles to nano-scale pigments.
  • the particle size dispersion prepared by this method is uneven. And it is difficult to obtain a small size ( ⁇ 50nm). Therefore, with the high requirements of liquid crystal display technology for color gamut, penetration and contrast, the development of pigments in color film photoresists is also a key factor restricting the development of high-performance liquid crystal display technology.
  • the purpose of the present invention is to provide a method for preparing a pigment dispersion, which uses a template method to prepare a pigment dispersion with uniform particle size, controllable scale and high dispersibility.
  • a template method to prepare a pigment dispersion with uniform particle size, controllable scale and high dispersibility.
  • the present invention provides a method for preparing a pigment dispersion, which includes the following steps:
  • Step S1 preparing a covalent organic framework material, the covalent organic framework material has a network structure
  • Step S2 Provide pigment, prepare the pigment into a pigment solution, place the covalent organic framework material in the pigment solution, that is, use the covalent organic framework material as a template, and let the pigment molecules in the form of a solution in the network structure of the covalent organic framework Medium crystallization, forming pigment crystals;
  • Step S3 Separate the pigment crystals from the network structure of the covalent organic framework by salt washing, and add a surfactant to obtain a pigment dispersion.
  • the method for preparing the covalent organic framework material in the step S1 is that the tetrakis (4-formylphenyl) methane compound and the phenylenediamine compound undergo a Schiff base reaction under the action of a catalyst to obtain the covalent organic framework material .
  • the tetrakis(4-formylphenyl)methane compound is tetrakis(4-formylphenyl)methane or a derivative of tetrakis(4-formylphenyl)methane, and the phenylenediamine compound is terephthalic diamine. Amine or phenylenediamine derivatives;
  • n is the number of alkane connected to the middle carbon atom, n is 1-30;
  • n is the number of repeating units of the middle benzene ring, and m is 1-15.
  • the catalyst used in the step S1 is bis((trifluoromethyl)sulfonyl)imide.
  • the pigment provided in the step S2 is a red pigment, a green pigment, a yellow pigment or a blue pigment.
  • the pigments provided in the step S2 are pigment red 254, pigment red 177, pigment green 7, pigment green 36, pigment green 58, pigment yellow 138, pigment yellow 150, pigment yellow 185 and pigment blue B15:1-6 One or more.
  • the network structure of the covalent organic framework material prepared in the step S1 has a grid, and the equivalent diameter of the grid is 20-60 nm.
  • the salt lotion used in the salt washing in the step S3 is sodium chloride.
  • the pigment dispersion is used to prepare color photoresist.
  • the color photoresist is used to prepare the color photoresist on the color film substrate.
  • the preparation method of the pigment dispersion of the present invention uses a covalent organic framework material with a network structure as a template, allowing the pigment molecules to crystallize in the network structure of the covalent organic framework in the form of a solution, so that it can be used
  • the mesh size of the covalent organic framework network structure controls the particle size of the pigment crystals.
  • the pigment crystals are separated from the covalent organic framework by salt washing, and surfactants are added to obtain A pigment dispersion with high dispersibility and uniform particle size.
  • the pigment dispersion can be used to prepare color photoresist after post-processing. It is a high-performance pigment that can achieve high penetration and high contrast in display products.
  • Covalent organic framework materials Can be reused many times.
  • Fig. 1 is a schematic flow chart of the preparation method of the pigment dispersion of the present invention
  • Figure 2 is a schematic diagram of the three-dimensional network structure of covalent organic framework materials.
  • the present invention provides a method for preparing a pigment dispersion, which is used to prepare a color photoresist, and then used to prepare a color photoresist on a color film substrate, which can achieve high penetration of display products. And high-contrast high-performance pigments.
  • Example 1 Using the network structure of covalent organic framework materials (Covalent Organic Frameworks, COF) to prepare a red pigment dispersion
  • Step S1 Prepare a covalent organic framework material, the covalent organic framework material has a network structure, and during the preparation process, the organic building units are connected together by covalent bonds to form a porous framework with a periodic structure.
  • the covalent organic framework material can be produced in the following manner: the tetrakis (4-formylphenyl) methane compound and the phenylenediamine compound undergo a Schiff base reaction under the action of a catalyst to obtain the covalent organic framework material.
  • the tetrakis(4-formylphenyl)methane compound is tetrakis(4-formylphenyl)methane or a derivative of tetrakis(4-formylphenyl)methane
  • the phenylenediamine compound is p- Phenylenediamine or phenylenediamine derivatives.
  • tetrakis(4-formylphenyl)methane and p-phenylenediamine can undergo a Schiff base reaction at room temperature under the action of a catalyst to form
  • the chemical reaction formula of a covalent organic framework material with a network structure is as follows:
  • the structure of COF can be modified according to the structures of tetrakis (4-formylphenyl) methane compounds and phenylenediamine compounds, as shown in Figure 2, and then Regulate the grid size in the COF network structure, and control the equivalent diameter of the grid in the network structure within the range of 20-60nm.
  • the number n of the alkane connected to the middle carbon atom can be 1-30, and the length of the alkane connected to the middle carbon atom is 6-36 nm.
  • the length of the repeating unit of the middle benzene ring can also be used to control the spatial size of the network structure.
  • the number of repeating units m of the middle benzene ring can be 1-15, and the length of the repeating unit of the middle benzene ring ranges from 5 to 5 75nm.
  • the catalyst used in the step S1 is bis((trifluoromethyl)sulfonyl)imide.
  • Step S2 using the aforementioned COF network structure as a template to prepare a red pigment into a pigment solution.
  • the covalent organic skeleton The material is placed in the pigment solution, and the nanocrystal structure of the red pigment can be formed after 120 minutes of rest. That is, the covalent organic framework material is used as a template to allow the pigment molecules to crystallize in the covalent organic framework network structure in the form of a solution to form the pigment Crystal.
  • the molecular structural formulas of Pigment Red 254 and Pigment Red 177 are respectively
  • Step S3 Separate the pigment crystals from the network structure of the covalent organic framework by salt washing, that is, use a salt solution such as sodium chloride solution to wash the pigment crystals from the network structure of the covalent organic framework, and then add to the surface Active agent to obtain a pigment dispersion of a red pigment with uniform dispersion and uniform particle size.
  • salt washing that is, use a salt solution such as sodium chloride solution to wash the pigment crystals from the network structure of the covalent organic framework, and then add to the surface Active agent to obtain a pigment dispersion of a red pigment with uniform dispersion and uniform particle size.
  • the green pigment was prepared into a pigment solution.
  • the three common green pigments in color photoresist, Pigment Green 7, Pigment Green 36, and Pigment Green 58 were taken as examples.
  • the covalent organic framework material is placed in the pigment solution, and the nanocrystalline structure of the green pigment can be formed after 120 minutes of standing. Its size can be controlled by the size of the grid in the COF network structure, and then the green pigment is washed by salt.
  • the crystals are separated from the COF network structure, and then surfactants are added to obtain a highly dispersed, uniform particle size green pigment dispersion.
  • the molecular structural formulas of Pigment Green 7, Pigment Green 36, and Pigment Green 58 are respectively
  • the yellow pigment was prepared into a pigment solution.
  • three common yellow pigments in color photoresist, Pigment Yellow 138, Pigment Yellow 150, and Pigment Yellow 185 were taken as examples.
  • the covalent organic framework material is placed in the pigment solution, and the nanocrystalline structure of the yellow pigment can be formed after standing for 120 minutes. Its size can be controlled by the size of the grid in the COF network structure, and then the yellow pigment is washed by salt.
  • the crystals are separated from the COF network structure and surfactants are added to obtain a yellow pigment dispersion with high dispersion and uniform particle size.
  • the molecular structural formulas of Pigment Yellow 138, Pigment Yellow 150 and Pigment Yellow 185 are respectively
  • the blue pigment was prepared into a pigment solution.
  • the organic framework material is placed in the pigment solution, and it can form the nanocrystalline structure of the blue pigment after 120 minutes of standing. Its size can be controlled by the size of the grid in the COF network structure, and then the blue pigment is washed by salt.
  • the crystals are separated from the COF network structure, and a surfactant is added to obtain a highly dispersed, uniform particle size blue pigment dispersion.
  • the molecular structure of Pigment Blue B15:1-6 is
  • the preparation method of the pigment dispersion of the present invention uses a covalent organic framework material with a network structure as a template, allowing the pigment molecules to crystallize in the covalent organic framework network structure in the form of a solution, so that the covalent organic framework network structure can be utilized
  • the particle size of the pigment crystal is controlled by the mesh size of the pigment. After the pigment is fully crystallized, the pigment crystal is separated from the covalent organic framework by salt washing, and surfactants are added, so that high dispersibility and particle size can be obtained.
  • the pigment dispersion can be used to prepare color photoresist after post-processing. It is a high-performance pigment that can achieve high penetration and high contrast for display products, and the covalent organic skeleton material can be reused many times .
  • the preparation method of the pigment dispersion of the present invention uses a covalent organic framework material with a network structure as a template, allowing the pigment molecules to crystallize in the network structure of the covalent organic framework in the form of a solution, so that the covalent organic framework can be used
  • the mesh size of the valence organic framework network structure controls the particle size of the pigment crystals.
  • the pigment crystals are separated from the covalent organic framework by salt washing, and surfactants are added to obtain high
  • the pigment dispersion can be used to prepare color photoresists after post-processing. It is a high-performance pigment that can achieve high penetration and high contrast in display products.
  • Covalent organic framework materials can Repeated use many times.

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Abstract

本发明提供一种颜料分散液的制备方法，以具有网络结构的共价有机骨架材料作为模板，让颜料分子以溶液的形式在共价有机骨架的网络结构中结晶，从而可以利用共价有机骨架网络结构的网格大小来控制颜料晶体的颗粒大小，待颜料充分结晶之后，通过盐洗的方式将颜料晶体从共价有机骨架中分离出来，添加表面活性剂，这样就可以得到高分散性且粒径均匀的颜料分散液，该颜料分散液经后处理可以用于制备彩色光刻胶，是种能够实现显示产品高穿透和高对比度的高性能颜料，而共价有机骨架材料可以多次重复利用。

Description

颜料分散液的制备方法 技术领域
本发明涉及显示技术领域，尤其涉及一种颜料分散液的制备方法。
背景技术
薄膜晶体管液晶显示装置(Thin Film Transistor Liquid Crystal Display，TFT-LCD)具有机身薄、省电、无辐射等众多优点，得到了广泛的应用。现有市场上的液晶显示装置大部分为背光型液晶显示装置，其包括液晶显示面板及背光模组(backlight module)。通常液晶显示面板由彩膜(Color Filter，CF)基板、TFT阵列基板、夹于彩膜基板与TFT阵列基板之间的液晶(Liquid Crystal，LC)及密封框胶(Sealant)组成；其成型工艺一般包括：前段阵列(Array)制程与CF制程(薄膜、黄光、蚀刻及剥膜)、中段成盒(Cell)制程(TFT阵列基板与CF基板贴合)及后段模组组装(Module)制程(驱动IC与印刷电路板压合)；其中，前段Array制程主要是形成TFT基板，以便于控制液晶分子的运动；前段CF制程主要是形成CF基板；中段Cell制程主要是在TFT基板与CF基板之间添加液晶；后段模组组装制程主要是驱动IC压合与印刷电路板的整合，进而驱动液晶分子转动，显示图像。
CF基板是LCD用来实现彩色显示的主要器件，其基本构成通常包括：玻璃基板、黑色矩阵(Black Matrix，BM)、彩色滤光层等等。其中，彩色滤光层主要是通过彩色光阻达到彩色显示的效果，背光源发出的光经过液晶分子的调制入射到CF基板，通过CF基板上彩色滤光层的红色(R)光阻、绿色(G)光阻、以及蓝色(B)光阻的滤光作用，分别显示红、绿、蓝三种光线，不同颜色的光阻分别透射对应颜色波段的光，从而实现显示器的彩色显示。
目前，TFT-LCD技术中彩色滤光层的制作方法以颜料(Pigment)分散法为主，彩色滤光层主要是由酞菁、偶氮、蒽醌类颜料分散于树脂之中，通过涂布、曝光、显影等制程形成R/G/B光阻图案。通常这些颜料在有机溶剂中的溶解性都比较差，例如彩色滤光层常用的PGMEA(丙二醇单甲醚酸酯)溶剂，以至于分散性差，而且颗粒属性的颜料存在散射，对LCD的亮度和对比度都有一定的影响，所以，目前将颜料色阻染料(Dye)化，这样可以有效的解决溶解性和分散性问题，利于提升LCD的亮度和对比度。 但是染料的热稳定性较差，难以满足LCD的工艺制程之中热制程(通常最高温度为230℃)，很多染料在热制程中因稳定性差而发生热裂解，这样对彩色滤光层的色度影响很大。
随着液晶显示技术的发展，对高色域、高穿透、高对比等性能的要求也越来越高，而彩色滤光层与色域、穿透率和对比度都有着直接的联系，那么行业内对彩膜光刻胶中颜料的要求自然也越来越高，颜料的高热稳定性可以满足液晶显示器的制备制程温度，颜料的粒径大小及粒径的分布成为提高产品质量的关键卡控系数。
目前制备颜料的方法都是通过“自上而下”的方式而获得的，即通过物理的方法来实现从大颗粒研磨分散到纳米尺度的颜料，这种方法制备出来的粒径分散不均匀，且难以获得小尺寸(≤50nm)。因此，目前随着液晶显示技术对色域、穿透和对比度等方面的高要求，作为彩膜光刻胶中颜料的发展，也是制约高性能液晶显示技术发展的关键因素。
发明内容
本发明的目的在于提供一种颜料分散液的制备方法，利用模板法制备出粒径均匀、尺度可控、高分散性的颜料分散液，该颜料分散液用作制备彩色光刻胶时，可满足高色域、高穿透及高对比的液晶显示器发展需求。
为实现上述目的，本发明提供了一种颜料分散液的制备方法，包括如下步骤：
步骤S1、制备共价有机骨架材料，所述共价有机骨架材料具有网络结构；
步骤S2、提供颜料，将颜料制备成颜料溶液，将共价有机骨架材料置于颜料溶液中，即以共价有机骨架材料作为模板，让颜料分子以溶液的形式在共价有机骨架的网络结构中结晶，形成颜料晶体；
步骤S3、通过盐洗的方式将颜料晶体从共价有机骨架的网络结构中分离出来，加入表面活性剂，得到颜料分散液。
所述步骤S1中制备共价有机骨架材料的方法为，将四(4-甲酰基苯基)甲烷类化合物和苯二胺类化合物在催化剂作用下发生席夫碱反应，得到共价有机骨架材料。
所述四(4-甲酰基苯基)甲烷类化合物为四(4-甲酰基苯基)甲烷或四(4-甲酰基苯基)甲烷衍生物，所述苯二胺类化合物为对苯二胺或苯二胺衍生物；
其中，所述四(4-甲酰基苯基)甲烷衍生物的结构通式为
Figure PCTCN2019101896-appb-000001
其中，n为中间碳原子连接烷烃的数量，n为1-30；
所述苯二胺衍生物的结构通式为
Figure PCTCN2019101896-appb-000002
其中，m为中间苯环的重复单元数，m为1-15。
所述步骤S1中所使用的催化剂为双((三氟甲基)磺酰基)酰亚胺。
所述步骤S2中提供的颜料为红色颜料、绿色颜料、黄色颜料或蓝色颜料。
所述步骤S2中提供的颜料为颜料红254、颜料红177、颜料绿7、颜料绿36、颜料绿58、颜料黄138、颜料黄150、颜料黄185及颜料蓝B15:1-6中的一种或多种。
所述步骤S1中所制备的共价有机骨架材料的网络结构具有网格，该网格的等效直径为20-60nm。
所述步骤S3中进行盐洗时所使用的盐洗剂为氯化钠。
所述颜料分散液用于制备彩色光刻胶。
所述彩色光刻胶用于制备彩膜基板上的彩色光阻。
本发明的有益效果：本发明的颜料分散液的制备方法，以具有网络结构的共价有机骨架材料作为模板，让颜料分子以溶液的形式在共价有机骨架的网络结构中结晶，从而可以利用共价有机骨架网络结构的网格大小来控制颜料晶体的颗粒大小，待颜料充分结晶之后，通过盐洗的方式将颜料晶体从共价有机骨架中分离出来，添加表面活性剂，这样就可以得到高分散性且粒径均匀的颜料分散液，该颜料分散液经后处理可以用于制备彩色光刻胶，为能够实现显示产品高穿透和高对比度的高性能颜料，而共价有机骨架材料可以多次重复利用。
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其它有益效果显而易见。
附图中，
图1为本发明颜料分散液的制备方法的流程示意图；
图2为共价有机骨架材料三维网络结构示意图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例进行详细描述。
请参阅图1，本发明提供一种颜料分散液的制备方法，该颜料分散液用于制备彩色光刻胶，进而用于制备彩膜基板上的彩色光阻，是能够实现显示产品高穿透和高对比度的高性能颜料。
实施例一、利用共价有机骨架材料(Covalent Organic Frameworks，COF)的网络结构制备红色颜料的颜料分散液
本实施例一包括如下步骤：
步骤S1、制备共价有机骨架材料，所述共价有机骨架材料具有网络结构，在制备过程中，有机构建单元通过共价键连接在一起，形成具有周期性结构的多孔骨架。
具体地，共价有机骨架材料可以通过如下方式生成：将四(4-甲酰基苯基)甲烷类化合物和苯二胺类化合物在催化剂作用下发生席夫碱反应，得到共价有机骨架材料。其中，所述四(4-甲酰基苯基)甲烷类化合物为四(4-甲酰基苯基)甲烷或四(4-甲酰基苯基)甲烷衍生物，所述苯二胺类化合物为对苯二胺或苯二胺衍生物。
以四(4-甲酰基苯基)甲烷和对苯二胺为例，将四(4-甲酰基苯基)甲烷和对苯二胺在催化剂作用下，常温就可以发生席夫碱反应，生成具有网络结构的共价有机骨架材料，其化学反应式如下所示：
Figure PCTCN2019101896-appb-000003
另外，在制备共价有机骨架材料的过程中，可以根据四(4-甲酰基苯基)甲烷类化合物和苯二胺类化合物的结构对COF的结构进行修改，如图2所示，进而可以调控COF网络结构中的网格大小，将其网络结构中网格的等效直径控制20-60nm范围内。
其中，所述四(4-甲酰基苯基)甲烷衍生物的结构通式为
Figure PCTCN2019101896-appb-000004
其中中间碳原子连接烷烃的数量n可以为1-30，该中间碳原子连接烷烃的长度是6-36nm。
所述苯二胺衍生物的结构通式为
Figure PCTCN2019101896-appb-000005
从而也可以通过其中间苯环的重复单元的长度来调控形成网络结构的空间尺寸，其中中间苯环的重复单元数m可以是1-15，该中间苯环的重复单元的长度范围在5-75nm。
由四(4-甲酰基苯基)甲烷衍生物和苯二胺衍生物在催化剂作用下，发生席夫碱反应生成的COF结构通式下所示，
Figure PCTCN2019101896-appb-000006
具体地，所述步骤S1中所使用的催化剂为双((三氟甲基)磺酰基)酰亚胺。
步骤S2、利用上述的COF的网络结构作为模板，将红色颜料制备成颜料溶液，其中以彩色光刻胶中常见的两种红色颜料，颜料红254和颜料红177为例，将共价有机骨架材料置于颜料溶液中，静止120分钟就可以形成红色颜料的纳米晶体结构，即以共价有机骨架材料作为模板，让颜料分子以溶液的形式在共价有机骨架的网络结构中结晶，形成颜料晶体。其中，颜料红254和颜料红177的分子结构式分别为
Figure PCTCN2019101896-appb-000007
步骤S3、通过盐洗的方式将颜料晶体从共价有机骨架的网络结构中分离出来，即使用盐溶液例如氯化钠溶液将颜料晶体从共价有机骨架的网络结构中冲刷出来，然后加入表面活性剂，得到分散均匀、粒径均匀的红色颜料的颜料分散液。
实施例二、利用COF的网络结构制备绿色颜料的颜料分散液
利用实施例一中的COF的网络结构作为模板，将绿色颜料制备成颜料溶液，其中以彩色光刻胶中常见的三种绿色颜料，颜料绿7、颜料绿36、颜料绿58为例，将共价有机骨架材料置于颜料溶液中，静止120分钟就可以形成绿色颜料的纳米晶体结构，其尺寸可以通过COF网络结构中网格的大小来控制，再通过盐洗的方式将绿色颜料的颜料晶体从COF的网络结构中分离出来，然后添加表面活性剂，就可以得到高分散、粒径均匀的绿色颜料的颜料分散液。其中，颜料绿7、颜料绿36、颜料绿58的分子结构式分别为
Figure PCTCN2019101896-appb-000008
实施例三、利用COF的网络结构制备黄色颜料的颜料分散液
利用实施例一中的COF的网络结构作为模板，将黄色颜料制备成颜料溶液，其中以彩色光刻胶中常见的三种黄色颜料，颜料黄138、颜料黄150、颜料黄185为例，将共价有机骨架材料置于颜料溶液中，静止120分钟就可以形成黄色颜料的纳米晶体结构，其尺寸可以通过COF网络结构中网格的大小来控制，然后通过盐洗的方式将黄色颜料的颜料晶体从COF的网络结构中分离出来，添加表面活性剂，就可以得到高分散、粒径均匀的黄色颜料的颜料分散液。其中，颜料黄138、颜料黄150、颜料黄185的分子结构式分别为
Figure PCTCN2019101896-appb-000009
实施例四、利用COF的网络结构制备蓝色颜料的颜料分散液
利用实施例一中的COF的网络结构作为模板，将蓝色颜料制备成颜料溶液，其中以彩色光刻胶中常见的一种蓝色颜料，颜料蓝B15:1-6为例，将共价有机骨架材料置于颜料溶液中，静止120分钟就可以形成蓝色颜料的纳米晶体结构，其尺寸可以通过COF网络结构中网格的大小来控制，然后通过盐洗的方式将蓝色颜料的颜料晶体从COF的网络结构中分离出来，添 加表面活性剂，就可以得到高分散、粒径均匀的蓝色颜料的颜料分散液。其中，颜料蓝B15:1-6的分子结构式为
Figure PCTCN2019101896-appb-000010
本发明的颜料分散液的制备方法，以具有网络结构的共价有机骨架材料作为模板，让颜料分子以溶液的形式在共价有机骨架的网络结构中结晶，从而可以利用共价有机骨架网络结构的网格大小来控制颜料晶体的颗粒大小，待颜料充分结晶之后，然后通过盐洗的方式将颜料晶体从共价有机骨架中分离出来，添加表面活性剂，这样就可以得到高分散性且粒径均匀的颜料分散液，该颜料分散液经后处理可以用于制备彩色光刻胶，为能够实现显示产品高穿透和高对比度的高性能颜料，而共价有机骨架材料可以多次重复利用。
综上所述，本发明的颜料分散液的制备方法，以具有网络结构的共价有机骨架材料作为模板，让颜料分子以溶液的形式在共价有机骨架的网络结构中结晶，从而可以利用共价有机骨架网络结构的网格大小来控制颜料晶体的颗粒大小，待颜料充分结晶之后，通过盐洗的方式将颜料晶体从共价有机骨架中分离出来，添加表面活性剂，这样就可以得到高分散性且粒径均匀的颜料分散液，该颜料分散液经后处理可以用于制备彩色光刻胶，为能够实现显示产品高穿透和高对比度的高性能颜料，而共价有机骨架材料可以多次重复利用。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (10)

  1. 一种颜料分散液的制备方法，包括如下步骤：
    步骤S1、制备共价有机骨架材料，所述共价有机骨架材料具有网络结构；
    步骤S2、提供颜料，将颜料制备成颜料溶液，将共价有机骨架材料置于颜料溶液中，即以共价有机骨架材料作为模板，让颜料分子以溶液的形式在共价有机骨架的网络结构中结晶，形成颜料晶体；
    步骤S3、通过盐洗的方式将颜料晶体从共价有机骨架的网络结构中分离出来，加入表面活性剂，得到颜料分散液。
  2. 如权利要求1所述的颜料分散液的制备方法，其中，所述步骤S1中制备共价有机骨架材料的方法为，将四(4-甲酰基苯基)甲烷类化合物和苯二胺类化合物在催化剂作用下发生席夫碱反应，得到共价有机骨架材料。
  3. 如权利要求2所述的颜料分散液的制备方法，其中，所述四(4-甲酰基苯基)甲烷类化合物为四(4-甲酰基苯基)甲烷或四(4-甲酰基苯基)甲烷衍生物，所述苯二胺类化合物为对苯二胺或苯二胺衍生物；
    所述四(4-甲酰基苯基)甲烷衍生物的结构通式为
    Figure PCTCN2019101896-appb-100001
    其中，n为中间碳原子连接烷烃的数量，n为1-30；
    所述苯二胺衍生物的结构通式为
    Figure PCTCN2019101896-appb-100002
    其中，m为中间苯环的重复单元数，m为1-15。
  4. 如权利要求2所述的颜料分散液的制备方法，其中，所述步骤S1 中所使用的催化剂为双((三氟甲基)磺酰基)酰亚胺。
  5. 如权利要求1所述的颜料分散液的制备方法，其中，所述步骤S2中提供的颜料为红色颜料、绿色颜料、黄色颜料或蓝色颜料。
  6. 如权利要求5所述的颜料分散液的制备方法，其中，所述步骤S2中提供的颜料为颜料红254、颜料红177、颜料绿7、颜料绿36、颜料绿58、颜料黄138、颜料黄150、颜料黄185及颜料蓝B15:1-6中的一种或多种。
  7. 如权利要求1所述的颜料分散液的制备方法，其中，所述步骤S1中所制备的共价有机骨架材料的网络结构具有网格，该网格的等效直径为20-60nm。
  8. 如权利要求1所述的颜料分散液的制备方法，其中，所述步骤S3中进行盐洗时所使用的盐洗剂为氯化钠。
  9. 如权利要求1所述的颜料分散液的制备方法，其中，所述颜料分散液用于制备彩色光刻胶。
  10. 如权利要求9所述的颜料分散液的制备方法，其中，所述彩色光刻胶用于制备彩膜基板上的彩色光阻。
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