The invention discloses an
acrylamide modified graft
copolymer and a preparation method and usage thereof. The invention is characterized in that 20 parts of
acrylamide, 1-20 anionic
monomer and / or cationic
monomer, 0.1-15
macromonomer, 0.05-10 ionic lyophobic
monomer and 50-1000 deionized water are added into a three-necked reaction
bottle, the pH value is adjusted to be 3-9, N2 is introduced for 30min, then 0.002-0.5 part of initiator
persulfate is added at 30-75 DEG C, the reaction lasts 8-36h, then
copolymer PAB is obtained, and finally water is used for
dilution to obtain strong PAB solution. During
polymerization, no surfactant is used, and the
macromonomer with a
long chain and the ionic lyophobic monomer with intermolecular association function are introduced into the
copolymer PAB, so the capabilities of cooperative tackification and salt-resistance between the rigid conformation of a molecular chain and the intermolecular association can be played optimally, the PAB exhibits unique solution property and has higher colloidal
viscosity in high
saline solution than in
fresh water, and the PAB obtains the capabilities of tackification,
salt resistance, low
surface tension and strong molecular association and can be used for the oil-displacing
acrylamide modified graft copolymer. The copolymer is prepared into water solution with
mass concentration of 0.2-3.0g / L and surfactant concentration of 0.01-2 mmol / L, then the water solution is added into a mixing vessel by a stirring device, and then a
polymer oil-displacing agent with tackification,
salt resistance and
cutting resistance is obtained. The PAB has the functions of both a
tackifier and a
macromolecule surfactant. The copolymer PAB is prepared into water solution which has
mass concentration of 0.05-7%, so the
macromolecule surfactant with excellent surface activeness can be obtained and then applicable to an emulsifier, an
emulsion splitter, a solubilizer and a
wetting agent.