A temperature-resistant and salt-resistant multi-component copolymer and its preparation method and application

Abstract

The invention discloses a preparation method of a temperature-resistant and salt-resistant soluble multi-component copolymer: (1) Mixing a temperature-resistant water-soluble polymer solution and a photoinitiator solution, adding a water-soluble monomer, mixing, passing an inert gas to remove oxygen , and then placed under ultraviolet light for 10 to 30 minutes, and the light intensity was set to 500 to 10000 μW / cm 2 ; That is, a temperature-resistant multifunctional macromolecular initiator; (2) Dissolving the temperature-resistant multifunctional macromolecular initiator in water, then adding monomers, passing an inert gas to remove oxygen; Living / controllable radical polymerization of water-soluble monomers to obtain temperature-resistant and salt-resistant multi-polymers. The temperature-resistant and salt-resistant multi-component copolymer of the present invention has an ultra-high molecular weight of 1.9×10 7 Above, and temperature-resistant, salt-resistant, it can be used to increase the viscosity of aqueous solution under high-temperature and high-salinity conditions, and can be used as an oil displacement agent for tertiary oil recovery under high-temperature and high-salinity geological conditions to enhance oil recovery.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant ultra-high molecular weight water-soluble multi-polymer, a preparation method and application thereof. Background technique [0002] In the polymer synthesis industry, free radical polymerization is the most widely used, and has the advantages of wide application range of monomers, mild polymerization conditions, and simple operation. However, the traditional free radical polymerization also has many shortcomings and deficiencies due to the limitation of the reaction mechanism, such as poor control over the polymerization product, the molecular structure and molecular weight of the prepared polymerization product are often uncontrollable, and the molecular structure design of the polymerization product is relatively difficult. [0003] In order to solve the defect of uncontrollable molecular structure and molecular weight of products by traditional free radical polymerization, research...

AI Technical Summary

Problems solved by technology

However, for water-soluble monomers, especially water-soluble monomers such as (meth)acrylamide monomers, (meth)acrylic acid, (meth)acrylate salts, due to the presence of carboxyl or amide groups, the polymerization of monomers The activity is relatively high, and the terminal halogen of the active chain is prone to nucleophilic substitution side reactions leading to the loss of the terminal halogen. The side reactions such as hydrolysis and ammonolysis of the RAFT reagent also limit the application of the RAFT polymerization system, so it is different from other conventional monomers. Compared with the living / controllable radical polymerization of water-soluble monomers, there are few studies; and compared with the organic phase reaction system, the control effect of the living / controllable radical polymerization methods commonly used in the water-phase reaction system on the polymerization of water-soluble monomers All have different degrees of decline, and the transition metals (ATRP polymerization system) and RAFT reagents introduced in the system have a great impact on the properties of the prepared polymers, thus limiting the conventional living / controllable free radical polymerization in water-soluble polypolymers. Applications in the field of copolymer preparation

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