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Synthesis method of high-molecular-weight sodium polyacrylate dispersing agent

A sodium polyacrylate, high molecular weight technology, used in pigment-containing coatings, coatings, paper coatings, etc., can solve problems such as poor dispersion effect, achieve excellent dispersion performance, low viscosity, and reduce energy consumption.

Inactive Publication Date: 2021-02-02
常熟聚和化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the sodium polyacrylate dispersants currently on the market are low-molecular-weight dispersants, and the main problem of this type of dispersant is that the dispersion effect is poor and cannot meet the needs of actual production.

Method used

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  • Synthesis method of high-molecular-weight sodium polyacrylate dispersing agent
  • Synthesis method of high-molecular-weight sodium polyacrylate dispersing agent
  • Synthesis method of high-molecular-weight sodium polyacrylate dispersing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of synthetic method of the sodium polyacrylate dispersant of high molecular weight, it comprises the steps:

[0023] S1 Add 500 g of acrylic acid, 50 g of methacryloyloxyethyltrimethylammonium chloride and 10% initiator 1 (5 g of azobisisobutyronitrile and 5 g of azobisisoheptyl nitrile) dropwise, dropwise Add time 1h, temperature 40℃;

[0024] S2 Initiator 1 is added dropwise and titration concentration is 5% initiator 2 ammonium persulfate 6g and concentration is 1% inhibitor sodium hypophosphite 2g, titration time 3h, temperature 85 ℃, after dropwise addition finishes, insulation reaction 1h, Then use liquid caustic soda to adjust the pH to 4;

[0025] The S3 reaction liquid is diluted to 5% aqueous solution, homogeneous, and the homogeneous conditions are: pressure 10Mpa, time 1h, temperature 60°C, and the liquid obtained by homogenization can be used as a grinding dispersant.

Embodiment 2

[0027] A method for synthesizing high-molecular-weight sodium polyacrylate dispersant, the difference from Example 1 is that the amount of monomer added in S1 is: 1000 g of acrylic acid and 200 g of methacryloxyethyltrimethylammonium chloride.

Embodiment 3

[0029] A kind of synthetic method of the sodium polyacrylate dispersant of high molecular weight, its difference with embodiment 1 is only, the concentration of initiator 1 is 2% (azobisisobutyronitrile 5g and azobisisoheptylonitrile 5g).

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Abstract

The invention belongs to the technical field of preparation of sodium polyacrylate dispersing agents, and particularly relates to a synthesis method of a high-molecular-weight sodium polyacrylate dispersing agent. The method comprises the steps of carrying out a free radical copolymerization reaction on monomer acrylic acid and methacryloyloxyethyl trimethyl ammonium chloride in the presence of aninitiator and a chain transfer agent, adjusting the pH value to 3-6 by using liquid caustic soda after the reaction is finished, adding water for dilution, and homogenizing to obtain a homogenized liquid. The dispersing agent provided by the invention is used for dispersing calcium carbonate and has excellent viscosity performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of sodium polyacrylate dispersant, in particular to a synthesis method of high molecular weight sodium polyacrylate dispersant. Background technique [0002] In the paper industry, calcium carbonate has been widely used as a paper coating. However, marble must be mechanically crushed, ground, and classified before it can be made into fine particles before it can be used in the preparation of paper coatings. The effect of dispersant in calcium carbonate is to prepare calcium carbonate slurry with high solid content and low viscosity. The dispersant is mainly adsorbed on the surface of the pigment particles to generate electrostatic repulsion and steric hindrance, so that the particles can exist stably in a suspended state, the grinding efficiency is also improved, and the energy required for grinding can be saved. However, most of the sodium polyacrylate dispersants currently on the market are...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/34C08F4/04C08F4/30D21H19/38D21H19/58
CPCC08F220/06C08F4/04C08F4/30D21H19/385D21H19/58C08F220/34
Inventor 徐晓峰曹广宇陈娓
Owner 常熟聚和化学有限公司
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