Synthesis And Property Investigation Of The Ore-shell Composite Microspheres Based On Olyacrylamide

Polyacrylamide (PAM) and its derivatives have been used in Oil recovery,watertreatment,papermaking, mineral processing and other fields.They are water-solublepolymer and versatile.They can be used as additives for paper, adhesives,leatherre-tanning agents,flocculants,filtrate reducer.The PAM polymers adding thecrosslinking agents have excellent swelling,water retention and water absorption,andthey can be used as the "diaper" material, soil water conservation agent,and oil fieldwater shutoff agent.The paper studied the synthesis of core-shell composite microspheres based onpolyacrylamide.We have investigated the effects of initiator,polymerizing temperature,pH,concentration of surfactant and concentration of inntiator on the solid content andrelative molecular weight(MR) of polyacrylamide to control the core-shell polymerstructure and particle size,in order to achieve the aim of the efficient profile control ofhigh temperature,high salt and low-yielding reservoir.Transmission electronmicroscopy (TEM) and scanning electron microscopy (SEM) were used tocharacterize the morphology of the polymer microspheres.The paper alsocharacterized IR spectra of PAM derivatives,solid content, degree of hydrolysis,intrinsic viscosity,swelling,water absorbency,the glass transition temperature (Tg) andblocking performance.Anionic polyacrylamide (PAM) polymers which added the crosslinking agent N,N-methylene bisacrylamide were synthesized using the method of inverse emulsionpolymerization.First,the paper discussed the best conditions of obtaining stabilizedpolymer latex,including reaction temperature,heating modes,the decentralized mannerof the oil-water phase,the type and quality of the emulsifier.Then the single factorexperiment which investigated the quality of initiator,acrylamide,2-methyl-2-acrylamido propane sulfonic acid and crosslinker were used to disscussed the impactof the monomer conversion and the swelling of the polymer microspheres.Finally,thebest conditions of the polymer emulsion were obtained.The parallel experiments of the best conditions for the polymer microspheres were carried out and then we testedthe infrared absorbency, solid content, degree of hydrolysis and so on.After that,inorder to modify the performance of the water-soluble polymer microspheres,we addedsoluble starch to the reaction system and explored the monomer conversion rate,solidcontent,degree of hydrolysis and so on.Styrene and acrylamide were used as the main monomer to participate in theinverse emulsion polymerization,in the process of which the oil and water phase allparticipated in the polymerization reaction.On the basis of the second chapter,singlefactor experiment which investigated the quality and the adding time ofinitiator(AIBN),the quality and the adding time of styene,the quality of crosslinker,thetype of emulsifier and the adding time of additional emulsifier were used todisscussed the impact of the monomer conversion and the swelling of the polymermicrospheres.By Orthogonal experiment,we studied the impact of the ratio of rawmaterials by discussing the conversion rate,solid content,degree of hydrolysis,IRspectra,intrinsic viscosity,water absorbency,the glass transition temperature (Tg) andblocking performance.Finally,the best performance of the reactive monomer ratiowere obtained.