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Water-based pigment self-dispersing system and preparation method thereof

A water-based pigment, self-dispersing technology, applied in inorganic pigment processing, chemical instruments and methods, fibrous fillers, etc., can solve the problems of poor stability, unstable particle size, large viscosity change, etc. Uniform, low viscosity effect

Active Publication Date: 2019-01-25
上海贝通色彩科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a water-based pigment self-dispersing system and its preparation method to solve the existing defects of self-dispersing pigments such as poor stability, large viscosity change, and unstable particle size

Method used

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  • Water-based pigment self-dispersing system and preparation method thereof
  • Water-based pigment self-dispersing system and preparation method thereof
  • Water-based pigment self-dispersing system and preparation method thereof

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preparation example Construction

[0025] The preparation method of the water-based pigment self-dispersing system of the embodiment of the present invention, it comprises the following steps:

[0026] Step A: reacting aromatic amine and cyanuric chloride to prepare a condensation product of aromatic amine and cyanuric chloride, which is a surface modifier. Wherein, the aromatic amine is one or more of p-aminobenzenesulfonic acid, p-aminobenzoic acid, anthranilic acid or anthranilic acid. The molar ratio of the condensation reaction between aromatic amine and cyanuric chloride is 1.05:2~1.05:1. Preferably, the optimal molar ratio of the condensation reaction between aromatic amine and cyanuric chloride is 1.05:1.2.

[0027] Step B: Mix the surface modifier and the pigment evenly. The pigment can be black pigment, red pigment, blue pigment or yellow pigment, and add an oxidizing agent. The oxidizing agent can be potassium permanganate, potassium chlorate or potassium perchlorate. Perform surface modification. ...

Embodiment 1

[0039] Add 65g of p-aminobenzoic acid into ultrapure water, adjust to dissolve completely with sodium hydroxide. Add 83g of cyanuric chloride to 500g of ice-water mixture and stir evenly. Slowly add the p-aminobenzoic acid solution into the cyanuric chloride ice-water mixture, stir while adding, control the temperature not to exceed 10°C, and control the pH of the reaction with a buffer solution of sodium hydroxide and sodium bicarbonate to 5-6 until When the pH does not change any more, the solution is filtered to obtain a filtrate, and a solution containing surface modifier A is obtained. Wherein, the chemical structural formula of surface modifier A is as follows:

[0040]

[0041] where n=2-6.

[0042] Beat 150g of carbon black HIBlack 900L, surface modifier A solution, and 1.5L of ultrapure water with a high-speed disperser, then add 67g of potassium permanganate, slowly raise the temperature to 60°C, and use sodium hydroxide to control the pH of the reaction solutio...

Embodiment 2

[0045]Add 80g of p-aminobenzenesulfonic acid into ultrapure water, adjust to dissolve completely with sodium hydroxide, add 103g of cyanuric chloride into 600g of ice-water mixture and stir evenly, slowly add p-aminobenzenesulfonic acid solution into trimeric chloride In the cyanide-ice water mixture, stir while adding, control the reaction temperature not to exceed 10°C, control the pH of the reaction with a buffer solution of sodium hydroxide and sodium bicarbonate to 3.5-4.5 until the pH does not change any more, filter to obtain the filtrate, and obtain the Solution of Surface Modifier B. Wherein, the chemical structural formula of surface modifier B is as follows:

[0046]

[0047] where n=3-8.

[0048] Beat 150g of carbon black Monarch 700, surface modifier B solution, and 1.5L of ultrapure water with a high-speed disperser, then add 44.5g of potassium chlorate, slowly raise the temperature to 65°C, and use sodium hydroxide to control the pH=9.0. React at ~70°C for ...

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Abstract

The invention discloses a water-based pigment self-dispersing system and a preparation method thereof. The preparation method comprises the following steps that A, aromatic amine reacts with cyanuricchloride so as to prepare a surface modifier; B, the surface modifier and pigment are uniformly mixed, in addition, an oxidant is added, the pH value of a reaction solution is controlled to be 8-9, and the reaction temperature is 60-70 DEG C until the reaction is ended so as to obtain modified crude water-based pigment; and C, the crude water-based pigment is centrifuged so as to remove large particles, and desalting and concentrating are carried out so as to obtain water-based pigment of the self-dispersing system. According to the water-based pigment self-dispersing system and the preparation method thereof, surface modification is carried out on pigment particles by using a condensation compound of the aromatic amine and the cyanuric chloride so as to prepared the self-dispersing water-based pigment system, and the water-based pigment particles of the system is small, uniform and stable in particle size.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of preparation of water-based pigments, in particular to a self-dispersing system of water-based pigments and a preparation method. Background technique [0002] Oil-based system pigments are widely used in many fields of industry, such as automotive and industrial coatings, paints, inks, toners, latex, etc. However, the conventional solvent system has the disadvantage of polluting the environment during use, and is under increasing pressure from environmental protection. These oily system pigments are gradually being replaced by water-based system pigments. [0003] At present, the pigment system for water-based pigments, dispersants, surfactants, resins, water or water mixtures and water-soluble organic solvents. By grinding, the large particle size pigments are ground to the small particle size pigments that meet the application requirements, and these small particle size pigmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/56C09C3/08C09C3/10C09C3/06
CPCC09C1/56C09C3/006
Inventor 李超李剑锋刘晓光
Owner 上海贝通色彩科技有限公司
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