A kind of low molecular weight cationic polymer dispersant for wet grinding and preparation method thereof

Abstract

The invention provides a low molecular weight cationic polymer dispersant for wet grinding and a preparation method thereof. The polymer dispersant comprises the following components in parts by weight except water: sodium methacrylate: 7-11 parts, sodium hypophosphite monohydrate: 10-16 parts, hydrogen peroxide: 10-16 parts Parts, ammonium persulfate: 4-8 parts, initiator: 202-305 parts, small monomer solution: 125-390 parts, sodium metabisulfite: 10-20 parts, liquid caustic soda: 15-40 parts. The method is carried out according to the following steps: 1. feeding for the first time; 2. temperature control; 3. feeding for the second time; 4. aging process. The cationic polymer cationic group of the present invention adopts quaternary amine, quaternary phosphine, sulfonic acid group, phosphoric acid group, amide group multi-component composite, which is different from the single amide and DAC composite anchoring effect of general cationic polymer-polyacrylamide, and the process A low-concentration synthesis method is adopted, and the concentration of the finished product is 20% to ensure its low molecular weight distribution, and the process is simple, the working hours are short, and the production is simple.

Description

Technical field: [0001] The invention relates to the field of building materials, in particular to a low molecular weight cationic polymer dispersant for wet grinding and a preparation method thereof. Background technique: [0002] The industrial waste slag discharge process is generally water-cooled or wet-discharged. The water-quenched slag has a moisture content of 10%-20%, and the wet-discharged fly ash has a higher moisture content. The existing grinding method needs to be dried or burnt. In order to remove the water in it, every ton of water-quenched slag needs to consume tens of kilograms of fuel (generally light diesel oil or coal powder), which increases the cost of the existing treatment method. energy consumption. With the wet grinding method of stirring mill, the water in the industrial waste does not need to be dried, and the water in the wet grinding can also play the role of a grinding aid, reducing the surface energy and strength of the mineral admixture; in...

AI Technical Summary

Problems solved by technology

During the wet grinding process, the product cannot be over-grinded. Re-grinding or over-grinding will lead to agglomeration of the slurry and an increase in viscosity, resulting in an increase in the amount of dispersant added, which will seriously affect the normal operation of the subsequent process.

[0004] Common inorganic dispersants do not have steric hindrance, limited repellency, and cannot reduce the moisture content of wet-milled ultrafine admixtures; while common polymer dispersants are mostly used in other industries, their molecular structure and size cannot adapt The application system of the superfine mineral admixture

Taking polyacrylamide as an example, the low molecular weight of industrial-grade products on the market is more than several million. Its long-chain structure promotes bridging between particles or flocculation and agglomeration of particles through charge neutralization, increasing viscosity. In addition, this molecular level is also It is impossible to achieve the overall effective adsorption of the entire surface area of ​​ultrafine mineral admixture particles of a few microns, so that the application effect of high dispersion and viscosity reduction cannot be achieved, and additional bridging effects will occur