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Cellulose graft copolymer, and preparation method and application thereof

A technology of cellulose grafting and grafting copolymers, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of viscosity, strength improvement, little change in relative molecular weight, etc., to meet environmental protection, The effect of improving temperature resistance and temperature resistance and improving filtration effect

Pending Publication Date: 2019-07-05
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with natural cellulose, modified cellulose has a certain improvement in performance, but the relative molecular weight does not change much, resulting in a great impact on the improvement of its viscosity and strength.

Method used

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  • Cellulose graft copolymer, and preparation method and application thereof
  • Cellulose graft copolymer, and preparation method and application thereof
  • Cellulose graft copolymer, and preparation method and application thereof

Examples

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specific Embodiment approach

[0048] According to a preferred embodiment of the present invention, the method for preparing the cellulose graft copolymer comprises the following steps:

[0049] 1) Add water to the reactor, under nitrogen atmosphere, add CMC, then heat up to the temperature required for polymerization and stir evenly;

[0050] 2) adding NaOH solution to the reactor to adjust the pH of the solution;

[0051] 3) The aqueous solution of the cerium ion initiator is added in the reactor, and then stirred evenly;

[0052] 4) adding the respective aqueous solutions of AM, AMPS and METAC to the reactor to carry out graft polymerization to form a polymer solution containing the cellulose graft copolymer;

[0053] 5) washing, suction filtering, rinsing and drying the polymer solution to obtain the crude product of the graft copolymer;

[0054] 6) Extracting and drying the crude product to obtain the cellulose graft copolymer.

[0055] In the present invention, the mass ratio of the amount of water...

Embodiment 1

[0063] This example is used to illustrate the cellulose graft copolymer of the present invention and its preparation method.

[0064] 1) Add deionized water to a four-neck flask placed in a water bath, then add CMC under nitrogen protection and raise the temperature to 45°C, and stir at constant temperature for 30 minutes;

[0065] 2) Add 30% by weight of NaOH solution to the four-necked flask to adjust the pH value to 7;

[0066] 3) Add the aqueous solution of ammonium cerium nitrate into the four-necked flask, and stir at constant temperature for 10 min;

[0067] 4) Add the aqueous solution of AM, the aqueous solution of AMPS and the aqueous solution of METAC into the four-necked flask respectively, continue to feed nitrogen, and react at constant temperature for 4 hours;

[0068] Wherein, the mass ratio of the amount of water to the total amount of polymerized monomers is 100:6, the mass of CMC:AM:AMPS:METAC is 4:2:1:1, and the amount of ammonium cerium nitrate is 0.3% by ...

Embodiment 2-11

[0076] This example is used to illustrate the cellulose graft copolymer of the present invention and its preparation method.

[0077] Prepare the cellulose graft copolymer according to the method of Example 1, the difference is that the ratio of the monomer mixture, the amount of the initiator and the conditions of graft polymerization are adjusted to obtain the cellulose graft copolymer A2-A11 , the above-mentioned adjustment and the viscosity-average molecular weight of the polymer obtained are specifically shown in Table 1.

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Abstract

The invention relates to the field of fluid loss agents, and discloses a cellulose graft copolymer, and a preparation method and an application thereof. The graft copolymer includes a carboxymethyl cellulose main chain and side chains, and the side chains include a structural unit represented by formula (1), a structural unit represented by formula (2), and a structural unit represented by formula(3); and a mass ratio of the carboxymethyl cellulose main chain to the structural unit of the formula (1) to the structural unit of the formula (2) to the structural unit of the formula (3) is (2-6):(1-4):(1-3):1. The cellulose graft copolymer can enhance the temperature resistance, the calcium resistance and the salt resistance of a drilling fluid and improve the fluid loss reduction effect of the drilling fluid when used in the drilling fluid as a fluid loss agent, and also can meet environmental protection requirements.

Description

technical field [0001] The invention relates to the field of fluid loss control agents, in particular to a cellulose graft copolymer, a preparation method of the cellulose graft copolymer, and an application of the cellulose graft copolymer in drilling fluid. Background technique [0002] With the development of the petroleum industry and the continuous increase of oil demand, the exploration and development of oil and gas is gradually developing towards the middle and deep areas, and the environmental protection in oil and gas exploration and development is getting more and more attention, and the drilling fluid treatment agent is indispensable in the production process. It is an indispensable part, and its requirements are getting higher and higher. Therefore, it is an urgent problem to be solved to improve the safety, high efficiency and environmental protection performance of drilling fluid. [0003] Among drilling fluid treatment agents, fluid loss control agents are us...

Claims

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Application Information

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IPC IPC(8): C08F251/02C08F220/56C08F220/58C08F220/34C09K8/035
CPCC08F251/02C09K8/035C08F220/585
Inventor 黄维安李轩宿振国陈二丁刘均一曹杰王婧雯钟汉毅
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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