Patent ID: 9296936
Filing Date: 2016-03-29
CPC Classification: C08F,C09K

Claim Text:
1. A preparation method of a wettability reversal agent, comprising: (1) adding an emulsifier into water to prepare a mixed solution of emulsifier; (2) adding compounds represented by formula (1-a), (2-a), (3-a), (4-a), (5-a), and (6-a) to the mixed solution of emulsifier to obtain a pre-emulsion, adding an initiator, and initiating a polymerization reaction; wherein, R a molar ratio among the compounds represented by formula (1-a), (2-a), (3-a), (4-a), (5-a), and (6-a) is 1:0.9-1.5:0.09-0.5:0.2-0.5:0.05-0.3:0.3-0.8; and conditions of the polymerization reaction ensures that weight-average molecular weight of the obtained wettability reversal agent is 5,000-7,000 g/mol; wherein, a weight ratio of emulsifier to water in the mixed solution of emulsifier obtained in step (1) is 0.7-2:100.