[Abstract] Using inverse emulsion polymerization method, (NH4) 2 S2O8-N aH SO3 as oxidation-reduction initiator, Span80 / OP-10 as composite emulsifier, dodecylamine as co-emulsifier, an anionic Surface-active monomer MS (a sulfonate-type monomer with a hydrolysis-resistant N-alkyl acrylamide structure in its molecule), N, N-diisooctyl acrylamide hydrophobic monomer (D iC8AM) and propylene AM-MS-D iC8 AM (referred to as PM D) copolymer was prepared by copolymerization of amide (AM). The experimental results show that the preferred conditions for preparing PM D copolymer are: reaction temperature 40; reaction time 5 h; n ((NH4) 2 S2O8)! N (NaH SO 3) = 1! 1, w (initiator) = 0.10% (based on total monomers); control the hydrophilic and lipophilic value of Span80 / OP-10 composite emulsifier between 5 and 6; the amount of AM, MS, D iC 8AM (based on the quality of the polymerization system) respectively It is 23. 6%, 6.0%, 0.4%. The aqueous solution of PMD copolymer prepared under better conditions has higher surface activity, apparent viscosity and salt resistance (viscosity retention rate is 62.2%).
[Key words] inverse emulsion polymerization; polymer surfactant; polymer flooding; tertiary oil recovery; recovery factor
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