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A kind of instant polyanion cellulose and preparation method thereof

A polyanion and cellulose technology, applied in the field of instant polyanionic cellulose and its preparation, can solve the problems of long dissolution time, clumping, slow viscosity release, etc. uniform effect

Active Publication Date: 2016-09-07
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

[0005] The technical problem to be solved by the present invention is to overcome the defects of the existing polyanionic cellulose such as long dissolving time, easy occurrence of "grouping" phenomenon, and slow viscosity release speed, and provide a polyanionic cellulose and its preparation method

Method used

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  • A kind of instant polyanion cellulose and preparation method thereof
  • A kind of instant polyanion cellulose and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Under agitation, 120kg of refined cotton cellulose with a degree of polymerization of 2400 is added to 166kg of a mass concentration of 49.5% sodium hydroxide solution and 200kg of a volume concentration of 92% ethanol in water, and the feeding time is 7 minutes to carry out alkali The alkalization reaction, the alkalization temperature is 25-30°C, and the alkalization time is 45min; add 137kg of mixed solution B, control the feeding time for 30-35min, and stir for 15-20min after adding, the mass concentration of chloroacetic acid in the mixed solution B is 70%, and the volume concentration of ethanol aqueous solution is 95%; slowly warming up to 80°C for etherification reaction, the heating time is 15min, and the etherification reaction time is 45min; after etherification is completed, cool to 45-50°C, and add the material to In an aqueous ethanol solution with a volume concentration of 70%, adjust the pH to 6.5-7.0 with hydrochloric acid, wash twice and centrifuge ...

Embodiment 2

[0044] (1) Under stirring conditions, add 120kg of refined cotton cellulose with a degree of polymerization of 2180 to 179kg of sodium hydroxide solution with a mass concentration of 49.0% and 200kg of an aqueous ethanol solution with a volume concentration of 92%, and control the feeding time for 5 to 10 minutes , carry out the alkalization reaction, the alkalization temperature is 20-25°C, and the alkalization time is 45min; add 145kg of mixed solution B, control the feeding time for 40-45min, and stir for 10-15min after adding, the chloroacetic acid in the mixed solution B The mass concentration of the ethanol solution is 70%, and the volume concentration of the aqueous ethanol solution is 95%; the temperature is slowly raised to 80°C for etherification reaction, the heating time is 15min, and the etherification reaction time is 45min; after the etherification is completed, it is cooled to 40-45°C, and the The material is added to an ethanol aqueous solution with a volume co...

Embodiment 3

[0048] (1) Under agitation, add 120 kg of refined cotton cellulose with a degree of polymerization of 1560 to 180 kg of sodium hydroxide solution with a mass concentration of 48.0% and 200 kg of an aqueous ethanol solution with a volume concentration of 92%, and control the feeding time for 5 to 10 minutes , carry out alkalization reaction, alkalization temperature is 35~40 ℃, alkalization time is 45min; add 146kg mixed solution B, control feeding time 45~50min, stir 5~10min after adding, the chloroacetic acid in described mixed solution B The mass concentration of the ethanol solution is 68%, and the volume concentration of the ethanol aqueous solution is 95%; the temperature is slowly raised to 80°C for etherification reaction, the heating time is 15min, and the etherification reaction time is 45min; after the etherification is completed, it is cooled to 50-55°C, and the The material is added to an ethanol aqueous solution with a volume concentration of 70%, the pH is adjuste...

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Abstract

The invention discloses instant polyanionic cellulose and a preparation method thereof. The method comprises the following steps: (1) alkalifying cellulose, etherifying, mixing with ethanol water, adjusting the pH to be 6.5-8.5, washing and centrifuging, so as to obtain a middle material; (2) mixing the middle material with ethanol water I, adding a mixed liquid A, and carrying out crosslinking reaction at room temperature for 30-80 minutes, wherein the mixed liquid A is composed of oxalaldehyde, an acid aqueous solution, and ethanol water II, the use amount of oxalaldehyde is 3%-8% of weight of the cellulose, and the use amount of the acid aqueous solution is 0.1%-1.5% of weight of the cellulose; and (3) centrifugally separating, drying, baking, crushing, and sieving, so as to obtain the instant polyanionic cellulose. The viscosity of the instant polyanionic cellulose disclosed by the invention is greater than or equal to 320mPa.s; the dispersion time in water is smaller than or equal to 30s; the dissolution viscosity-release time is 15-30 minutes; the degree of substitution is high; and the crosslinking degree between the same batch of products is relatively uniform.

Description

technical field [0001] The invention relates to an instant polyanionic cellulose and a preparation method thereof. Background technique [0002] Polyanionic cellulose, referred to as PAC, is a water-soluble cellulose ether derivative obtained by chemically modifying natural cellulose. Its molecular structure is the same as that of sodium carboxymethyl cellulose (CMC). An important water-soluble cellulose ether, its sodium salt is usually used. In the field of oil drilling, it is usually named after polyanionic cellulose, and its essence is sodium carboxymethyl cellulose. Polyanionic cellulose has good heat resistance stability and salt resistance, and strong antibacterial properties. The mud fluid prepared by this product has good water loss reduction, inhibition, and high temperature resistance, and is widely used in oil drilling, especially salt water wells and offshore oil drilling. [0003] However, during the use of polyanionic cellulose, there is a problem that the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B15/00C08B11/12C08B1/08
Inventor 朱宏彬倪志青
Owner 上海长光企业发展有限公司