Preparation method of water-in-water type cationic polyacrylamide emulsion

Abstract

The invention relates to a preparation method of a polyacrylamide emulsion. The method is characterized by comprising the following steps: taking dimethyl diallyl ammonia chloride (DMDAAC) as the cationic monomer, taking ammonium sulfate and PDMDAAC respectively as the dispersion medium and the dispersion agent for CPAM dispersion polymerization in a saline water medium, and making acrylamide to carry out free radical copolymerization reactions with quaternary ammonium salt organic compounds so as to generate the water-in-water type cationic polyacrylamide emulsion. The appearance of the emulsion is in a milk white color, and the particle size is smaller than 1 [mu]m, which is in the range of emulsion particle size value. The preparation method adopts a novel polymer synthesis method, and overcomes the shortages existing in the prior art that a large amount of organic solvent and surfactant used in the synthesis process generates secondary pollutions to the environment and the product cost is greatly increased. The emulsion can be widely applied to the fields of oil field, industrial or city sewage processing, sludge dehydration, paper making, and personal nursing and cosmetic.

Description

technical field [0001] The invention relates to the technical field of preparation methods of water-soluble polymeric organic compound cationic polyacrylamide, in particular to a preparation method of 'water-in-water' cationic polyacrylamide. Background technique [0002] Polyacrylamide (PAM) is currently the most widely used water-soluble polymer, among which cationic polyacrylamide (CPAM) is widely used in papermaking, metallurgy, mining, printing and dyeing, textile, It is widely used in daily chemical industry, industrial water treatment, clay anti-swelling, acid thickening, water plugging and profile control in the process of oil and gas drilling and production. [0003] Most of the early CPAM products were colloidal, that is, acrylamide (AM) monomers and cationic monomers were copolymerized in aqueous solution or PAM was modified by Mannich reaction to obtain gel-like products. Due to the low polymer content (mass fraction generally not exceeding 8%), this type of pro...

AI Technical Summary

Problems solved by technology

Although the powder product has greatly expanded the scope of use, it also has some defects: first, it needs to consume a lot of steam and electric energy in the process of drying, crushing and granulation; It reduces the molecular weight and broadens the molecular weight distribution, thereby weakening its final application performance; third, the powdered product is easily inhaled into the respiratory tract, threatening the health of production and user personnel; fourth, the dissolution rate is slow (usually takes more than 40min), and It is easy to produce "fish eyes" during the dissolution process. In order to overcome this defect, oil field sites or water treatment plants need to be equipped with large-scale dissolution devices and ripening equipment. These equipment are large in size and occupy a large area, and are not suitable for oceans with limited space. platform

Emulsion or microemulsion products solve the solubility problem better, and have higher molecular weight and higher solid content, but they need to add phase inversion agent during use, which makes it inconvenient to use

In addition, due to the use of a large amount of organic solvents and surfactants in the synthesis process, the cost of the product is greatly increased, and it is easy to cause secondary pollution to the environment and bring safety hazards