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A kind of polycarboxylic acid dispersant and its preparation method and application

A technology of dispersant and polycarboxylic acid, which is applied in chemical instruments and methods, dyeing polymer organic compound treatment, fibrous filler, etc., can solve the problems of unsatisfactory dispersion effect and comprehensive performance, and achieve low cost and improved water resistance , the effect of stable performance

Active Publication Date: 2016-03-16
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the prior art, there are few studies on nano-titanium dioxide dispersants, and the dispersion effect and comprehensive performance are not ideal

Method used

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  • A kind of polycarboxylic acid dispersant and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0030] A preparation method of polycarboxylic acid dispersant, comprising the following steps:

[0031] (1) In a 250mL four-necked flask equipped with a stirrer, dropping funnel, thermometer and reflux condenser, add 1.0 parts of crotonic acid, 1.1 parts of sodium methacrylate, 0.6 parts of maleic acid, and 0.03 parts of sulfurous acid Sodium hydrogen and 25 parts of water were stirred and dissolved, and the temperature was raised to 75°C to obtain a mixed solution;

[0032] (2) Slowly add ammonium persulfate aqueous solution (containing 0.11 parts of ammonium persulfate) dropwise to the mixed solution obtained in step (1), and the speed is controlled at 1 drop / second. After the dropwise addition is completed, stop the reaction after 3 hours of insulation reaction, and obtain The main product of dispersant;

[0033] (3) After cooling the main product of the dispersant obtained in step (2) to 40°C, adjust the pH value of the reaction system with a NaOH solution with a mass con...

Embodiment 2

[0039] A preparation method of polycarboxylic acid dispersant, comprising the following steps:

[0040] (1) In a 250mL four-neck flask equipped with a stirrer, dropping funnel, thermometer and reflux condenser, add 2.0 parts of crotonic acid, 1.6 parts of sodium methacrylate, 0.8 parts of maleic acid, and 0.04 parts of sulfurous acid Sodium hydrogen and 32 parts of water were stirred and dissolved, and the temperature was raised to 78°C to obtain a mixed solution;

[0041](2) Slowly add ammonium persulfate aqueous solution (containing 0.14 parts of ammonium persulfate) dropwise to the mixed solution obtained in step (1), and the speed is controlled at 1 drop / second. After the dropwise addition is completed, the reaction is stopped after the insulation reaction for 3 hours to obtain The main product of dispersant;

[0042] (3) After cooling the main product of the dispersant obtained in step (2) to 44°C, adjust the pH value of the reaction system with a NaOH solution with a ma...

Embodiment 3

[0048] A preparation method of polycarboxylic acid dispersant, comprising the following steps:

[0049] (1) In a 250mL four-neck flask equipped with a stirrer, dropping funnel, thermometer and reflux condenser, add 2.5 parts of crotonic acid, 1.8 parts of sodium methacrylate, 1.0 parts of maleic acid, and 0.05 parts of sulfurous acid Sodium hydrogen and 28 parts of water were stirred and dissolved, and the temperature was raised to 80°C to obtain a mixed solution;

[0050] (2) Slowly add ammonium persulfate aqueous solution (containing 0.18 parts of ammonium persulfate) dropwise to the mixed solution obtained in step (1), and the speed is controlled at 1 drop / second. After the dropwise addition is completed, the reaction is stopped after the insulation reaction for 3 hours to obtain The main product of dispersant;

[0051] (3) After cooling the main product of the dispersant obtained in step (2) to 48°C, adjust the pH value of the reaction system with a NaOH solution with a m...

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Abstract

The invention discloses a polycarboxylic acid dispersant and its preparation method and application. The polycarboxylic acid dispersant is composed of 1.0 to 3.0 parts by weight of unsaturated monomers containing carboxyl groups, 1.1 to 2.2 parts by weight of unsaturated monomers with sulfonic acid groups and 0.6 to 1.2 parts by weight of other free radical polymerizable unsaturated basic monomers. The body is obtained by radical polymerization in the presence of 25-35 parts by weight of water, 0.11-0.22 parts by weight of initiator, 0.03-0.06 parts by weight of chain transfer agent and 1.5-4.0 parts by weight of basic compound. The polycarboxylic acid dispersant of the invention has increased effective components, high solid content, stable performance, strong environmental adaptability, high dispersing ability for nano titanium dioxide, low cost and simple process. In addition, the preparation method of the polycarboxylic acid dispersant of the present invention does not need to use a large amount of organic solvents, and the environmental protection performance is improved.

Description

technical field [0001] The invention belongs to the field of additives, in particular to a polycarboxylic acid dispersant and its preparation method and application. Background technique [0002] A dispersant is a surfactant that is both lipophilic and hydrophilic. Dispersants can disperse solid particles that are difficult to dissolve in liquids, and at the same time prevent particles from agglomerating and settling to form a stable suspension. Generally, dispersants can be divided into four categories: anionic dispersants, cationic dispersants, nonionic dispersants and inorganic dispersants, among which anionic dispersants are the most widely used: (1) anionic dispersants, Through electrostatic repulsion and steric hindrance, it is adsorbed on the particle surface to make it negatively charged and stabilize the dispersion system; (2) Anionic dispersants mainly include carboxylate dispersants, sulfonate dispersants and phosphates. powder and so on. Cationic dispersants, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/04B01F17/52C08F228/02C08F222/02C08F2/38C09C1/36C09C3/10C09K23/52
Inventor 王斌严杰刘伟区庞浩刘化珍刘海露张磊徐莉莉郭逗逗
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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