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Preparation method of polyanionic cellulose

A technology of polyanion and cellulose, applied in the field of preparation of polyanion cellulose, can solve the problems of poor salt tolerance and poor water loss resistance, and achieve the effects of good salt tolerance, low cost and reduced production cost.

Active Publication Date: 2017-07-14
上海长光企业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects such as poor salt tolerance and poor dehydration resistance of polyanionic cellulose in the prior art, and provide a preparation method of polyanionic cellulose

Method used

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  • Preparation method of polyanionic cellulose

Examples

Experimental program
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Embodiment 1

[0041] The preparation method of the polyanionic cellulose of the present embodiment, it may further comprise the steps:

[0042] (1) In a kneader, mix 1215g of NaOH aqueous solution with a concentration of 50.2% (w / w) and 1626g of an aqueous ethanol solution with a concentration of 92% (v / v), and cool it to 10-35 ℃; the mass ratio of the NaOH aqueous solution to the ethanol aqueous solution is 1:1.338; 1000 g of refined cotton cellulose with a degree of polymerization of 2820 after shredding is put into a kneader to obtain a mixture A; Carry out alkalization reaction at 15-40°C, and obtain alkali cellulose after 50 minutes of reaction; the mass ratio of the refined cotton cellulose to the ethanol aqueous solution is 1:1.626;

[0043] (2) Mix 850g of 70% (w / w) ethanol aqueous solution of chloroacetic acid with alkali cellulose by spraying within 25 minutes. The mixing temperature is controlled within 15-40°C, and the concentration of ethanol aqueous solution is 92% (v / v), mix...

Embodiment 2

[0058] The preparation method of the polyanionic cellulose of the present embodiment, it may further comprise the steps:

[0059] (1) Mix 1267g of NaOH aqueous solution with a concentration of 50.2% (w / w) and 1788.6g of an aqueous ethanol solution with a concentration of 91.5% (v / v) in a kneader, and cool it down to 10°C with cooling water -35°C; the mass ratio of the NaOH aqueous solution to the ethanol aqueous solution is 1:1.412; 1000 g of refined cotton cellulose with a polymerization degree of 2430 after shredding is put into a kneader to obtain a mixture A ; carry out alkalization reaction at 15-40°C, and obtain alkali cellulose after 50 minutes of reaction; the mass ratio of the refined cotton cellulose to the ethanol aqueous solution is 1:1.789;

[0060] (2) Mix 1030g of chloroacetic acid aqueous ethanol solution with a concentration of 62% (w / w) and alkali cellulose by spraying within 25 minutes. The mixing temperature is controlled within 15°C-40°C. The concentration...

Embodiment 3

[0073] The preparation method of the polyanionic cellulose of the present embodiment, it may further comprise the steps:

[0074] (1) In a kneader, mix 1334g of NaOH aqueous solution with a concentration of 48.6% (w / w) and 2276.4g of an aqueous ethanol solution with a concentration of 93.5% (v / v), and cool it to 10- 35°C; the mass ratio of the NaOH aqueous solution to the ethanol aqueous solution is 1:1.706; put 1200g of wood pulp cellulose after crushing into the kneader to obtain the mixture A; at 15-40°C Perform an alkalization reaction, and obtain alkali cellulose after reacting for 50 minutes; the degree of polymerization of the wood pulp cellulose is 1100; the mass ratio of the wood pulp cellulose to the ethanol aqueous solution is 1:2.276;

[0075] (2) Mix 818g of ethanol aqueous solution of chloroacetic acid with a concentration of 76% (w / w) and alkali cellulose by spraying within 25 minutes. The mixing temperature is controlled within 15-40°C, and the concentration of...

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Abstract

The invention discloses a preparation method of polyanionic cellulose. The preparation method comprises the following steps of (1) alkalinizing cellulose by using a mixed solution A of a NaOH water solution and an ethanol water solution to obtain alkali cellulose; (2) mixing the alkali cellulose obtained in the step (1) and an etherifying agent and stirring to obtain a mixed material B; (3) mixing the mixed material B and solid NaOH and stirring to obtain a mixed material C; and (4) mixing the mixed material C and an etherifying agent, stirring to obtain a mixed material D, carrying out etherification reaction, then, purifying and aftertreating to obtain the polyanionic cellulose. The etherifying agents in the steps (2) and (4) are respectively an ethanol water solution of chloroacetic acid. The preparation method disclosed by the invention is simple in process, low in cost and suitable for industrial production; the polyanionic cellulose obtained by using the preparation method is high in substitution degree as well as good in salt tolerance and leaching resistance, and all indexes of the polyanionic cellulose can meet the requirement of the eighteenth edition of the drilling fluid material standard ANSI / API Spec13A.

Description

technical field [0001] The invention relates to a preparation method of polyanionic cellulose. Background technique [0002] Polyanionic cellulose, referred to as PAC, is a water-soluble ionic cellulose ether obtained by chemical modification with natural cellulose as the basic raw material. And suspension effect, widely used in food, toothpaste, paint, mining, oil drilling, etc., known as "industrial monosodium glutamate". [0003] Polyanionic cellulose is an important mud treatment agent in petroleum drilling. It is used in drilling, well completion and cementing, etc., to increase viscosity, reduce fluid loss, gel and suspend. Due to the continuous expansion of the field of oil exploration and the increase of the average drilling depth, the quality requirements for PAC are constantly increasing, and PAC is required to have higher viscosity, salt resistance, calcium resistance and temperature resistance. [0004] In order to improve the performance of PAC products, it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B11/12
Inventor 朱宏彬倪志青
Owner 上海长光企业发展有限公司
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