Modified nanocellulose as well as preparation method and application thereof

A nanocellulose, modified technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low molecular weight of copolymer, poor polymerization activity, increase product cost, etc., and achieve excellent temperature and salt resistance. Effects of aging, improved rigidity, good dispersion and high temperature stability

Active Publication Date: 2018-06-29
CNOOC TIANJIN BRANCH +1
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  • Description
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  • Application Information

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Problems solved by technology

However, the introduction of too many functional monomers will increase the cost of the product on the one hand, and on the other hand, compared with acrylamide, functional monomers tend t

Method used

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  • Modified nanocellulose as well as preparation method and application thereof
  • Modified nanocellulose as well as preparation method and application thereof
  • Modified nanocellulose as well as preparation method and application thereof

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Experimental program
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Embodiment 1

[0038] Embodiment 1, the preparation of modified nanocellulose

[0039] Add sodium periodate to the nanocellulose dispersion, adjust the pH value of the solution to 3.5, and react in the dark at 40°C for 12 hours; add ethylene glycol (concentration is 50g / L) to remove unreacted sodium periodate; Dialyzed three times to obtain formylated nanocellulose. Add polyethyleneimine to the aqueous dispersion of aldylated nanocellulose, stir and react at 35°C for 6 hours; add sodium borohydride and react for 3 hours; dialyze the product three times, wash and dry to obtain modified nanocellulose.

[0040] In the above method, the particle diameter of nanocellulose is 300~500nm, the mass volume concentration of nanocellulose in the mixed solution of sodium periodate and nanocellulose is 10g / L, and the mass volume concentration of sodium periodate is 6g / L. L; the concentration of formylated nanocellulose is 5g / L; the molecular weight of polyethyleneimine is 600, the concentration of polyet...

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Abstract

The invention discloses modified nanocellulose as well as a preparation method and an application thereof. The preparation method of the modified nanocellulose comprises the steps as follows: (1) sodium periodate is used for oxidizing nanocellulose and aldehyde nanocellulose is obtained; (2) aldehyde nanocellulose reacts with polyethylenimine and sodium borohydride sequentially, and the modified nanocellulose is prepared. The prepared nanocellulose has good dispersion performance and high-temperature stability, can improve the rigidity of polymer molecules and form good polymer intermolecularnetwork structures under the higher interaction between the modified nanocellulose and polymers and produce excellent temperature resistance, salt resistance, aging resistance and the like. The prepared modified nanocellulose has a certain oil washing effect.

Description

technical field [0001] The invention relates to a modified nano-cellulose and its preparation method and application, belonging to the technical field of oil field chemistry. Background technique [0002] Chemical flooding technology is one of the main technical measures to enhance oil recovery in my country. Water-soluble polymer is one of the key chemical agents for chemical flooding. The mobility ratio of the medium oil-water flow is used as a means, so as to achieve the purpose of expanding the sweep degree and improving the oil recovery factor. At present, tertiary oil recovery technologies such as polymer flooding, binary compound flooding (polymer-surfactant), and ASP flooding (alkali-polymer-surfactant) have been widely used in major eastern oilfields such as Shengli, Daqing, and Liaohe. It has been widely used, and has achieved remarkable oil-increasing and precipitation effects and good economic and social benefits. Partially hydrolyzed polyacrylamide (HPAM) is th...

Claims

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Application Information

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IPC IPC(8): C08B15/06C08B15/02C08G81/00C08F287/00C08F220/56C08F220/58C08F220/06C08F226/10C09K8/588
CPCC08B15/02C08B15/06C08F287/00C08G81/00C09K8/588C08F220/56
Inventor 王姗姗王秀军朱玥珺张健康晓东杨光薛新生赵文森王旭东靖波
Owner CNOOC TIANJIN BRANCH
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