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Polymer waterborne pigment dispersant

A technology of water-based pigments and dispersants, applied in the direction of organic dyes, dissolution, chemical instruments and methods, etc., can solve the problems of non-flocculation groups, unsuitable coatings, and increase coating adhesion, so as to enhance gloss and flow Flatness, shorten grinding time, improve the effect of pigment lubrication

Inactive Publication Date: 2010-06-23
SHANGHAI KEWANG NEW MATERIAL RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the viscosity of the paint is relatively high at this time, there will be no pigment anti-coarseness and severe flocculation, but if the viscosity is not well controlled, problems will occur over time; some use coupling agents as dispersants, through Their hydrophilic group and sulfur water group couple two different substances together, which makes the coating have good overall performance and can increase the adhesion of the coating. Paints with high color development are not suitable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 120 g of deionized water and 3.0 g of 27.5% hydrogen peroxide into a 500 ml four-necked flask equipped with a stirrer, a thermometer, and a dropping device, and stir to raise the temperature to 50° C. Add dropwise the monomer aqueous solution that has mixed naphthalenesulfonate, polycarboxylate, 50g deionized water simultaneously, wherein naphthalenesulfonate selects 1-sodium naphthalenesulfonate for use, polycarboxylate selects polyvinylpyrrolidone for use, both weight percentages 35%: 65%, the dropping time is controlled at about 90 minutes, and the reaction temperature is controlled at about 50°C. After the dropwise addition, keep the temperature at 50° C. for 30 minutes to complete the polymerization reaction. After the heat preservation, add 36 g of 30% NaOH to neutralize the pH to about 6.5 to obtain the pigment dispersant of the present invention.

Embodiment 2

[0024] Except that naphthalenesulfonate is selected 2-sodium naphthalenesulfonate, and polycarboxylate is selected maleic acid-acrylic acid salt, the percentage by weight of both is 10%: 90%, all the other embodiments are the same as embodiment 1.

Embodiment 3

[0026] Except that naphthalenesulfonate is selected from sodium methylene bissulfonate, and polycarboxylate is selected from polyacrylic acid salt, the percentage by weight of the two is 25%: 75%, and the remaining implementation methods are the same as in Example 1.

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Abstract

The invention provides a polymer waterborne pigment dispersant. The dispersant consists of 10 to 40 weight percent of naphthalene sulfonate and 60 to 90 weight percent of polycarboxylate. The dispersant can be widely used for architectural coatings, industrial coatings and pigment concentrated slurry, and has the advantages of promoting pigment lubrication, shortening grinding time, stabilizing pigment dispersion systems, preventing pigment flocculation and precipitate firming, reducing floating color and blur tendency in pigment systems, sharply reducing abrasive viscosity, improving the storage stability of coatings, enhancing glossiness and leveling property and stabilizing hue and color intensity.

Description

technical field [0001] The invention relates to the field of dispersants, more specifically, the invention relates to a polymer water-based pigment dispersant. Background technique [0002] Dispersants are also called wetting and dispersing agents. In addition to having the same wetting effect as wetting agents, one end of the active group can be adsorbed on the surface of the pigment that is crushed into fine particles, and the other end is solvated into the paint base to form an adsorption layer (the more the adsorption group more, the longer the chain link, the thicker the adsorption layer), generating charge repulsion (water-based paint) or entropy repulsion (solvent-based paint), so that the pigment particles are dispersed and suspended in the paint base for a long time to avoid re-flocculation, thus ensuring the finished color The paint system is storage stable. [0003] Pigment dispersion is quite complicated, and it is generally believed that there are three related...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F17/36C09B67/40C09K23/36
Inventor 徐守启
Owner SHANGHAI KEWANG NEW MATERIAL RES CENT
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