Preparation method of aqueous nano-pigment dispersion liquid

Abstract

The embodiment of the invention discloses a preparation method of an aqueous nano-pigment dispersion liquid, which relates to the field of preparation of colored photoresists and is used for overcoming various defects of a solvent type pigment dispersion liquid and increasing the developing efficiency of a pigment. The method comprises the following steps of: mixing 2.5-40 percent by weight of distilled styrene for removing a polymerization inhibitor, 2.5-20 percent by weight of an acrylic ester monomer, 0.25-5 percent by weight of a crosslinking monomer, 0.05-0.5 percent by weight of an emulsifying assisting agent, 0.05-0.5 percent by weight of an oil-soluble initiator and 0.25-2.5 percent by weight of an organic pigment to be dispersed, and fully dissolving to form an oil phase solution; dissolving 0.05-2.0 percent by weight of an emulsifier and 0.05-2 percent by weight of a buffering agent into 40-90 percent by weight of deionized water to form a water phase solution; mixing the oily phase solution with the water phase solution, stirring, and ultrasonically homogenizing into a fine emulsion; and transferring the fine emulsion into a reactor, introducing nitrogen gas, heating, initiating polymerization, reacting for 10-40 minutes, adding 0.5-5 percent by weight of an alkali-soluble monomer, continually reacting for 1-5 hours, cooling to the room temperature, adjusting the pH to 8-10 with ammonia water, filtering, and discharging to obtain the aqueous nano-pigment dispersion liquid.

Description

technical field [0001] The invention relates to the field of preparation of color photoresist, in particular to a preparation method of aqueous nano pigment dispersion liquid. Background technique [0002] Color filters are an important part of liquid crystal displays, and liquid crystal displays rely on color filters to present color images. The principle of presenting images is: the white light from the backlight is irradiated to the color filter through the liquid crystal layer, and the red, green and blue pigment photoresist corresponding to each pixel is passed through the color filter to form red light, green light and The blue light is finally mixed in the human eye to form a color image. [0003] The manufacturing process of color filters includes: printing method, dyeing method, pigment dispersion method, electrodeposition method, dry film method and inkjet method of large-size panels. At present, the manufacturing process of pigment dispersion method is widely use...

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Problems solved by technology

[0004] In realizing the above-mentioned process of pigment dispersion method with oil phase solvent as the dispersion medium, the inventors have found that there are at least the following problems in the prior art: the method is due to the use of a large amount of solvents, resulting in environmentally unfriendly volatile organic compounds (Volatile Organic Compounds, The solvent is flammable and explosive, which is not conducive to safe production; the solvent-based color photoresist prepared by solvent-based pigment dispersion has the inherent shortcomings of solvent-based light-curing materials in use, that is, the viscosity is not easy to adjust

Because controlling the viscosity for ease of construction requires controlling the molecular weight of the resin below a certain value, if the molecular weight of the resin is too high, it must be diluted with a large amount of reactive diluent, but this will lead to excessive crosslinking density and make the coating film brittle. Large, easy to shrink during curing; if the molecular weight of the resin is too low, it is difficult to meet the hardness requirements

This makes the coating film either "hard and brittle" or "soft and soft".

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