Preparation method of cationic polyacrylamide water-in-water emulsion

Abstract

The invention discloses a preparation method of a cationic polyacrylamide water-in-water emulsion. According to the preparation method, a monomer, an inorganic salt C and a dispersing agent D are subjected to addition polymerization reaction under the effect of an initiator I and then prepared into the target product, wherein the dispersing agent is the comb-like graft copolymer which is relatively small in molecular weight, low in positive charge density and high in side chain steric hindrance; the dispersing agent has the advantages of being low in viscosity, fast in dispersing and absorbing speed, stable in dispersing, and good in effect; furthermore, the dispersing agent is given an adjustable molecular structure, so that different structures can be designed for different polymerization systems, the pertinence is high, the viscosity of the polymerization systems can be effectively reduced, the solid content of the product is increased, and the stability of the water-in-water emulsion is improved; and furthermore, the cationic polyacrylamide water-in-water emulsion prepared by the preparation method disclosed by the invention has the advantages of being fast in dissolving speed, high in molecular weight, excellent in liquidity and convenient to use.

Description

technical field [0001] The invention belongs to the technical field of water-soluble polymer synthesis, and in particular relates to a preparation method of cationic polyacrylamide water-in-water emulsion. Background technique [0002] The structural characteristics and complete varieties of polyacrylamide make it widely used in various fields of the national economy, and enjoys the title of "all kinds of additives". In my country, due to the shortage of oil resources, water resources, and forest resources, the application of polyacrylamide in the three major fields of oil, water treatment and papermaking is particularly important and has strategic significance. [0003] The methods of synthesizing polyacrylamide include solution polymerization, inverse suspension polymerization and inverse emulsion polymerization. In the late stage of solution polymerization, the viscosity is very high, and it is very difficult to stir and dissipate heat. It is necessary to use special equ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the dispersant used in the preparation process of the polyacrylamide water-in-water emulsion in the prior art has a very slow adsorption rate and poor stabilizing effect due to the high molecular weight of the dispersant, and is more likely to be in the In the initial stage of the reaction, latex particles are often unable to be stably precipitated in time or the latex particles are prone to particle aggregation, which leads to the above-mentioned defects such as polymerization failure. A preparation method for cationic polyacrylamide water-in-water emulsion is provided. In the preparation method, a A comb-type graft copolymer with small molecular weight, low positive charge density, and strong side chain steric hindrance is used as a dispersant. The dispersant has the advantages of low viscosity, rapid diffusion and adsorption, and good dispersion and stability effects. The molecular structure of the product can be adjusted, and different structures can be designed for different polymerization systems. It is highly targeted, effectively reduces the viscosity of the polymerization system, improves the solid content of the product and the stability of the water-in-water emulsion, and is obtained by using the preparation method of the present invention. The cationic polyacrylamide water-in-water emulsion also has the advantages of fast dissolution, high molecular weight and good fluidity.

Images