Water-based nano pigment dispersion

A nano-pigment and dispersion technology, applied in the field of pigments, can solve the problems of low production efficiency, high purchase cost, and rising overall cost of planetary mixers, and achieve low cost, avoid pigment agglomeration, and improve pigment performance.

Pending Publication Date: 2022-03-04
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high purchase cost of free radical monomers, the planetary mixer used in the modification step has a low preparation efficiency, which leads to an increase in the overall cost and is only suitable for small-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of aqueous nano pigment dispersion, its preparation method comprises the steps:

[0042] Step 1, add 200 grams of Degussa carbon black 160IQ, 1500 grams of potassium chloride (400 orders), 300 grams of ethylene glycol in the kneader, after the kneader jacket temperature is adjusted to 60 ℃, carry out 8 hours of mixing refining. The kneaded material obtained above was taken out into a 20L container, then added with 15L of deionized water and stirred for 2 hours and then filtered to obtain a nano-carbon black pigment, which was washed 3 times repeatedly. Transfer the carbon black pigment to a 5L flask, add 5.0 g of ammonium persulfate and 2000.0 g of deionized water and stir to disperse.

[0043] Step 2: Add 70.0 g of sodium nitrite to 1000.0 g of ice-water mixture containing 5.0 g of hydrochloric acid, then slowly add 173.2 g of p-aminobenzenesulfonic acid and stir evenly to generate diazonium salt. Then this diazonium salt mixed solution is slowly added dropwis...

Embodiment 2

[0046] A kind of aqueous nano pigment dispersion, its preparation method comprises the steps:

[0047]Step 1, add 200 grams of Yabang Pigment Violet 19, 1500 grams of sodium chloride (300 mesh), 300 grams of diethylene glycol in the kneader, adjust the temperature of the jacket of the kneader to 60 ° C, and carry out 8 hours of mixing refining. The kneaded mixture obtained above was taken out into a 20L container, then 15L of deionized water was added and stirred for 2 hours, then filtered to obtain Nano Pigment Violet 19, which was washed 3 times repeatedly. Transfer Pigment Violet 19 to a 5L flask, add 5.0 g of ammonium persulfate and 2000.0 g of deionized water and stir to disperse.

[0048] Step 2: Add 70.0 g of sodium nitrite to 1 L of ice-water mixture containing 5.0 g of hydrochloric acid, then slowly add 173.2 g of p-aminobenzenesulfonic acid and stir evenly to form a diazonium salt. Then slowly drop the diazonium salt mixed solution into the 5L flask in the first st...

Embodiment 3

[0051] A kind of aqueous nano pigment dispersion, its preparation method comprises the steps:

[0052] Step 1: Add 200 grams of Xinkai Pigment Yellow 74, 1,500 grams of potassium chloride (400 mesh), and 300 grams of ethylene glycol into the kneader, adjust the temperature of the jacket of the kneader to 60°C, and knead for 8 hours . The kneaded product obtained above was taken out into a 20L container, then added with 15L of deionized water and stirred for 2 hours, then filtered to obtain Nano Pigment Yellow 74, which was washed 3 times repeatedly. Transfer Pigment Yellow 74 to a 5L flask, add 5.0 g of ammonium persulfate and 2000.0 g of deionized water and stir to disperse.

[0053] Step 2: Add 70.0 g of sodium nitrite to 1 L of ice-water mixture containing 5.0 g of hydrochloric acid, then slowly add 173.2 g of p-aminobenzenesulfonic acid and stir evenly to form a diazonium salt. Then slowly drop this diazonium salt mixed solution into the 5L flask of the first step, contr...

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Abstract

The invention provides a water-based nano pigment dispersion, and belongs to the field of pigments. The invention provides a water-based nano pigment dispersion. A preparation method of the water-based nano pigment dispersion comprises the following steps: step 1, preparing nano-scale pigment particles with uniform particle size; 2, hydrophilic groups are introduced to the surfaces of the nano-scale pigment particles through a diazonium salt coupling method, and modified nano-scale pigment particles are obtained; and step 3, adjusting the pH value of the modified nano pigment particles to 7-9 by using a pH regulator, washing, percolating, desalting, concentrating and removing impurities to obtain the water-based nano dispersion. According to the method, a process integration mode is adopted, pigment refinement and subsequent diazotization modification are linked, the phenomenon of pigment agglomeration possibly caused by step-by-step operation in a common mode is avoided, the more uniform water-based nano pigment is obtained, the primary particle size is reduced to about 50nm, and the pigment performance is greatly improved.

Description

technical field [0001] The invention relates to the field of pigments, in particular to an aqueous nano-dispersion. Background technique [0002] At present, the preparation of water-based nano-pigment dispersion mainly includes two methods: dispersant (or resin) dispersion and pigment surface modification. [0003] The dispersant dispersion method is mainly to form a physical modification layer on the surface by adding a dispersant (or resin) to coat or adsorb on the surface of the pigment. The coating layer generally has two forms: first, the stable coating layer can create a steric hindrance electron layer, thereby generating mutual repulsion between the pigment particles to achieve the effect of stable dispersion; second, the adsorption on solid particles The surface dispersant (resin) can reduce the interfacial tension between liquid-liquid or solid-liquid, so that the surface of the condensed solid particles is easy to wet. Pigment surface modification refers to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D17/00
CPCC09D17/003C09D17/005Y02P20/10
Inventor 翁枭迪崔光振徐杰薛国明顾广新
Owner FUDAN UNIV
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