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Sulfonic acid type block copolymer water-based dispersant synthesized by RAFT technology

A technology of block copolymers and water-based dispersants, which is applied in chemical/physical processes, pigment pastes, transportation and packaging, etc., can solve the problems of high molecular weight polydispersity coefficient and unstable dispersion performance of synthetic dispersants, and achieve phase Good capacity, large adsorption capacity and high dispersion efficiency

Active Publication Date: 2018-06-08
英德科迪颜料技术有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The paint or color paste using the dispersant of the invention can be ground to meet the fineness requirement in a short time. When it is used in finished paint, the finished paint has high hardness, good thermal storage and room temperature storage stability, and can effectively slow down the precipitation of the finished paint and floating color; but because the dispersant adopts the esterification method, the polydispersity coefficient of the molecular weight of the synthetic dispersant of the invention is relatively high, resulting in unstable dispersion performance

Method used

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  • Sulfonic acid type block copolymer water-based dispersant synthesized by RAFT technology
  • Sulfonic acid type block copolymer water-based dispersant synthesized by RAFT technology
  • Sulfonic acid type block copolymer water-based dispersant synthesized by RAFT technology

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A kind of sulfonic acid type block copolymer aqueous dispersant of RAFT technology, its steps are as follows:

[0027] a) According to the weight ratio of the formula, add dimethyl sulfoxide, hydroxybutyl acrylate, and 1,3-propane sultone into the reaction kettle in sequence, start stirring to dissolve evenly, heat to 65°C for 7 hours, and cool to Add methanol to dissolve at 40°C, then add acetone to precipitate, suction filter the precipitate, then dissolve with methanol, precipitate with acetone, and suction filter, repeat 2 to 3 times to obtain vinyl monomer I containing sodium sulfonate group; , the molar ratio of hydroxybutyl acrylate to 1,3-propane sultone is 1.3:1;

[0028] b), at N 2 In the protected reaction kettle, add 15.0 parts of maleic anhydride, 0.8 parts of diethyldithiocarbamate quaternary ammonium salt, and 45.0 parts of ethanol in sequence. After stirring and dissolving, heat up to 80°C and evenly add 10.0 parts of One part of ethanol solution conta...

Embodiment 2

[0030] A kind of sulfonic acid type block copolymer aqueous dispersant of RAFT technology, its steps are as follows:

[0031] a) According to the weight ratio of the formula, add butanone, hydroxyethyl methacrylate, and 1,4-butane sultone into the reaction kettle in sequence, start stirring and dissolving evenly, heat to 90°C for 6 hours, and cool to 40°C Add methanol to dissolve at ℃, then add acetone to precipitate, filter the precipitate, dissolve with methanol, precipitate with acetone, and filter with suction, repeat 2 to 3 times to obtain vinyl monomer I containing sodium sulfonate group; among them, The molar ratio of the hydroxyethyl methacrylate to 1,4-butane sultone is 1:1;

[0032] b), at N 2In the protected reaction kettle, add 20.0 parts of maleic anhydride, 0.5 parts of α-dithiobenzyl p-benzylidene pyridinium chloride, and 50.0 parts of water in sequence. After stirring and dissolving, heat up to 90°C. Evenly add 12.0 parts of ethanol solution containing 10% az...

Embodiment 3

[0034] A kind of sulfonic acid type block copolymer aqueous dispersant of RAFT technology, its steps are as follows:

[0035] a) According to the weight ratio of the formula, add dimethylformamide, hydroxypropyl methacrylate, and 3-methyl-1,3-propane sultone into the reaction kettle in sequence, start stirring to dissolve evenly, and heat to React at 70°C for 6 hours, cool to 40°C and add methanol to dissolve, then add acetone to precipitate, filter the precipitate, then dissolve with methanol, precipitate with acetone, and filter with suction, repeat 2 to 3 times to obtain sodium sulfonate group Vinyl monomer I; wherein, the molar ratio of hydroxypropyl methacrylate to 3-methyl-1,3-propane sultone is 1.2:1;

[0036] b), at N 2 In the protected reaction kettle, add 20.0 parts of maleic anhydride, 2.0 parts of dithiophenylacetic acid, and 60.0 parts of ethanol in sequence. After stirring and dissolving, heat up to 100°C and evenly add 15.0 parts of 10% azobisisobutyl The etha...

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Abstract

The invention relates to a sulfonic acid type block copolymer water-based dispersant synthesized by an RAFT technology and a preparation method of the dispersant. The dispersant is synthesized by using maleic anhydride, a vinyl monomer containing a sodium sulfonate salt, an RAFT reagent and an azo initiator through the RAFT technology; the vinyl monomer containing the sodium sulfonate salt is prepared from an acrylic monomer containing hydroxyl groups and the cycloalkyl sultone through a reaction; and the sulfonic acid type block copolymer water-based dispersant has an A-B block structure, wherein the molecular weight is 3000-10000, and the polydispersity index is less than 1.3. The sulfonic acid type block copolymer water-based dispersant provided by the invention comprises multi-anchoring groups, and has a large adsorption amount; due to the dual functions of electrostatic repulsion and steric hindrance, the dispersion efficiency is high, the compatibility is good, and a stable suspension system is formed, and the dispersant is suitable for the dispersion of pigment with a high specific surface area. The dispersant can be applied to water-based nano color paste, water-based digital color paste, water-based UV / LED color paste and water-based industrial paint color paste.

Description

technical field [0001] The invention relates to a polymer dispersant, in particular to a sulfonic acid type block copolymer aqueous dispersant of RAFT technology, and belongs to the technical field of polymer dispersants. Background technique [0002] In coatings, inks, cement, ceramic glazes and other chemical industries, the dispersion of pigments and fillers is an important part of manufacturing technology. In order to obtain uniform and stable dispersion of organic and inorganic pigments and fillers in related systems, dispersants are often used. Although traditional dispersants have shown effective dispersion stabilization in aqueous dispersion media, because their adsorption on the surface of pigment particles is not very firm, they are easily desorbed from the surface of the particles, resulting in re-agglomeration or precipitation of the dispersed particles. The long-term stability is not good, and it also has adverse effects on the appearance, hardness and aging re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00B01F17/52C09D17/00C09K23/52
CPCC09D17/001C08F293/005C08F2438/03C09K23/00
Inventor 陆明许钧强刘敏匡民明徐业雄王松
Owner 英德科迪颜料技术有限公司
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