METHOD OF OBTAINING OF MAGNETICALLY SUSCEPTIBLE WATER SOLUBLE HYDROPHOBICALLY MODIFIED POLYACRYLEAMIDES AND MAGNETIC LIQUID BASED ON THEM Russian patent published in 2014 - IPC C08F220/56 C08L33/26 B82B3/00 H01F1/44 

FIELD: chemistry.

SUBSTANCE: polyacryleamides are obtained by heterophase copolymerisation of vinyl monomers. First, n-dodecyclacrylamide is added to water solution of sodium dodecylsulfate, applied as stabiliser, with mixing. Then, water solution of acryleamide and acrylic acid is added to obtained dispersion. Reaction is carried out in alkaline medium at pH 9.5 with general concentration of copolymers from 3.0 to 3.8 mol/l. After that, particles of magnetic filler are added to obtained mixture with mixing in atmosphere of inert gas with gradual increase of reaction mass temperature from 20 to 55°C. Water solution of initiator, such as potassium persulphate or ammonium persulphate is added to obtained water dispersion to concentration 3.5-4.2 mmol/l. After that, obtained product is separated by known methods. As magnetic filler, applied is magnetite with particle size from 50 to 1000 nm or acicular particles of magnemite from 200 to 800 nm long with diameter from 20 to 50 nm. Magnetic liquid includes liquid phase - water or its mixture with organic solvents, such as ethanol methanol, and magnetic solid phase - upper said polyacryleamide.

EFFECT: invention makes it possible to obtain polyacryleamide by more technological economic method in absence of highly-toxic solvents and obtain magnetic liquid, which preserves sedimentation stability in magnetic field.

4 cl, 1 dwg, 1 tbl, 7 ex