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Waterborne dispersible monoazo nano organic pigment and preparation method thereof

A nano-organic and easily dispersible technology, applied in the direction of monoazo dyes, azo dyes, organic dyes, etc., can solve the problems of limited improvement of pigment hydrophilicity, no visible, narrow particle size distribution, etc., to achieve particle size distribution Effects of narrowness, improved hydrophilicity, and small pigment particles

Inactive Publication Date: 2018-11-02
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect described this patented technology allows creation of new types of materials called silicon oxide (silicate) coatings or shells containing certain molecules attached onto them. Siloxane compounds were previously found effective at modifying these surfaces when combined into solutions like epoxy resin compositions. By adding alkalinity agents such as calcium chlorate or sodium nitrate beforehand, they could improve compatibility between different components within the composition. Additionally, due to their ability to absorb light energy from sunlight, some research groups discovered that silica gel treated with ammonia was able to change its appearance depending upon factors affecting wettable characteristics. Overall, this technique makes possible production of novel materials with unique features including high stability, easy handling, printing performance, and absorption capabilities.

Problems solved by technology

This patents describes different ways how to make good quality colored materials like water-soluble or nonwater-aquatic paints that meet environmental regulations while maintaining their effectiveness over time. However, current techniques involve adding various substances into the formulation systems themselves without considering its potential negative influence upon human wellbeings and safety concerns associated with this new material. Therefore, technical solutions aimed at improving both dissolution/dispersibility and stabilizing the pH value of the solution were developed through advanced researches involving chemistry processes and molecular sieve synthesis techniques.

Method used

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  • Waterborne dispersible monoazo nano organic pigment and preparation method thereof
  • Waterborne dispersible monoazo nano organic pigment and preparation method thereof
  • Waterborne dispersible monoazo nano organic pigment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1. Water-based easily dispersible monoazo nano-organic pigment C.I.PR31*-nSiO 2 preparation of

[0046] (1) Preparation of rosin acid modified C.I.PR31*

[0047] First, 3-amino-4-methoxy-benzoanilide (red base KD, RBKD) and 2-hydroxy-3-naphthoyl m-nitroaniline (naphthoyl AS-BS, NASBS) were used as pigments Intermediate preparation of diazo solution and coupling solution; the mass ratio of 3-amino-4-methoxy-benzanilide to 2-hydroxy-3-naphthoyl m-nitroaniline is 1:1.28. In order to make rosin acid effectively inhibit the excessive growth of pigment crystal nuclei, after the coupling solution is dissolved, add 3% of the mass total amount of rosin acid that accounts for the main reaction raw materials (the sum of the above two reactants and rosin acid), and stir evenly Add ice to lower the temperature to 45°C and set aside; the coupling reaction adopts the positive coupling method on the liquid, and the diazo component is added dropwise to the beaker of the coupli...

Embodiment 2

[0050] Example 2. Water-based easily dispersible monoazo nano-organic pigment C.I.PR31*-nSiO 2 preparation of

[0051] (1) Preparation of rosin acid modified C.I.PR31*

[0052] First, 3-amino-4-methoxy-benzoanilide (red base KD, RBKD) and 2-hydroxy-3-naphthoyl m-nitroaniline (naphthoyl AS-BS, NASBS) were used as pigments Intermediate preparation of diazo liquid and coupling liquid; 3-amino-4-methoxyl-benzanilide and 2-hydroxyl-3-naphthoyl m-nitroaniline mass ratio of 1: 1.27; in order to make rosin Acid can effectively inhibit the excessive growth of pigment crystal nuclei. After the coupling solution is dissolved, add rosin acid accounting for 2% of the total mass of the main reaction raw materials (the sum of the above two reactants and rosin acid), stir evenly, and add ice to make the temperature Lower to 45°C and set aside; the coupling reaction adopts the positive coupling method on the liquid, and the diazo component is added dropwise to the beaker of the coupling solu...

Embodiment 3

[0055] Example 3. Water-based easily dispersible monoazo nano-organic pigment C.I.PR31*-nSiO 2 preparation of

[0056] (1) Preparation of rosin acid modified C.I.PR31*

[0057]First, 3-amino-4-methoxy-benzoanilide (red base KD, RBKD) and 2-hydroxy-3-naphthoyl m-nitroaniline (naphthoyl AS-BS, NASBS) were used as pigments Intermediate preparation of diazo solution and coupling solution; 3-amino-4-methoxy-benzoanilide and 2-hydroxyl-3-naphthoyl-m-nitroaniline mass ratio of 1: 1.29; in order to make rosin Acid can effectively inhibit the excessive growth of pigment crystal nuclei. After the coupling solution is dissolved, add rosin acid accounting for 5% of the total mass of the main reaction raw materials (the sum of the above two reactants and rosin acid), stir evenly, and add ice to make the temperature Lower to 45°C and set aside; the coupling reaction adopts the positive coupling method on the liquid, and the diazo component is added dropwise to the beaker of the coupling s...

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Abstract

The invention discloses waterborne dispersible monoazo nano organic pigment and a preparation method thereof, the preparation method comprises the following steps: (1) adding abietic acid before coupling reaction to obtain C.I.PR31* modified by abietic acid; (2) layer by layer self-assembled sol-gel method is used for preparing C.I.PR31*-2SiO2 coated with silicon dioxide, the preparation method provided by the invention can obtain pigment particles with small particle size and narrow particle size distribution, and the hydrophilicity of the pigment is obviously improved; the pigment particlesmodified by abietic acid are coated with two layers of SiO2, and the surface of the pigment particles is transformed to be completely hydrophilic, when the pigment particles are used as a colorant ofthe water-based ink, the pigment particles can be dispersed uniformly and stably in the water-based bonding material, so that the ink has good printing adaptability.

Description

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Claims

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Application Information

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Owner NANJING FORESTRY UNIV
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