Water soluble amphoteric ion copolymer and preparation process thereof

A technology of amphoteric ions and copolymers, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of less binary copolymerization, and achieve good water solubility and good viscosity-increasing effects
CN1861654AInactive Publication Date: 2006-11-15SOUTHWEST PETROLEUM UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTHWEST PETROLEUM UNIV
Publication Date
2006-11-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

A water-soluble zwitterionic copolymer contains two structure units: 2-methyl-2- acrylamido propanesulfonic acid and methyl acrylyloxyethyl trimethyl ammonium chloride. Its preparing process includes such steps as proportionally adding the anhydrate sorbitol monooleate and the anhydrated sorbitol monostearate to kerosene, proportionally dissolving two monomers in water and regulating its pH=7, proportionally mixing oil phase with water phase, filling N2, adding redox trigger, and redox reaction in constant-temp water bath.
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Description

Technical field

[0001] The invention relates to a zwitterionic copolymer and a preparation method thereof. Background technique

[0002] Zwitterionic polymer is a new type of polymer chemical agent. Because of its unique molecular structure and good application performance, it has been widely used in the petroleum industry in recent years. It has certain aspects in drilling fluid treatment agents, fracturing fluid additives, cement admixtures, and enhanced oil recovery chemicals. The application has great potential for development.

[0003] Monoteric polyelectrolyte has excellent viscosity-increasing ability, but poor salt resistance. The viscosity of amphoteric polymer gradually increases with the release of polymer molecular coils from small molecular salts. Zwitterionic polymer has both good viscosity-increasing and salt resistance. , Greatly play the role of high molecular polymers. The current synthesis methods of zwitterions include homogeneous polymerization and heterogene...

Claims

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