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Preparation method of high viscosity polyanion cellulose

A technology of polyanion and cellulose, applied in the field of preparation of polyanionic cellulose, can solve the problems of high filtration loss, poor salt tolerance, low viscosity of polyanionic cellulose, etc.

Inactive Publication Date: 2010-09-22
上海长光企业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to propose a preparation method of high-viscosity polyanion cellulose, to solve the problems of low viscosity, poor salt tolerance and high filtration loss of polyanion cellulose obtained by the existing preparation method of polyanion cellulose

Method used

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  • Preparation method of high viscosity polyanion cellulose

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preparation example Construction

[0027] see figure 1 . A preparation method of high-viscosity polyanionic cellulose, specifically comprising the following steps:

[0028] 1) Premixing: In the kneader, add solid alkali, liquid alkali and alcohol, premix for 10min-30min, so that the solid alkali is basically dissolved in liquid alkali and alcohol. The use of alkali in two forms of matter is mainly to control the moisture in the reaction and reduce the occurrence of side reactions.

[0029] 2) Feeding: After premixing, put the shredded refined cotton into the kneader. The average degree of polymerization of the refined cotton is 2000-4000.

[0030] 3) Alkalinization of cellulose: Add liquid caustic soda and alcohol into the kneader by spraying for alkalization of cellulose. During the entire alkalization process, the cooling water is used to control the temperature at 15°C-40°C. N 2 Protection, alkalization time is 30min-80min.

[0031] 4) Mixing of cellulose with etherifying agent: add the chloroacetic aci...

Embodiment 2

[0061] A preparation method of high-viscosity polyanionic cellulose, specifically comprising the following steps:

[0062] 1), premixing: in the kneader, add 644g of 48.5% liquid caustic soda, 1400ml of 95% alcohol and 170g of solid caustic, premix for 20min, so that the solid caustic is basically dissolved in the liquid caustic and alcohol middle.

[0063] 2) Feeding: After premixing, put 1200g of shredded refined cotton into the kneader. The average degree of polymerization of the refined cotton is 2000-4000.

[0064] 3), alkalization of cellulose: by spraying, 600g concentration is 48.5% liquid caustic soda and 1000ml concentration is 95% alcohol to join in the kneader, carry out the alkalization of cellulose, pass through in the whole alkalization process Control the temperature of cooling water at 15°C-40°C, pass N 2 Protection, alkalization time is 50min.

[0065] 4) Mixing of cellulose with etherifying agent: Add 1714g of 70% chloroacetic acid alcohol solution into t...

Embodiment 3

[0075] A preparation method of high-viscosity polyanionic cellulose, specifically comprising the following steps:

[0076] 1), premixing: in the kneader, add 626g of liquid caustic soda with a concentration of 49.3%, 1300ml of alcohol with a concentration of 93% and 170g of solid caustic, premix for 30min, so that the solid caustic is basically dissolved in the liquid caustic and alcohol middle.

[0077] 2) Feeding: After premixing, put 1200g of shredded refined cotton into the kneader, the average degree of polymerization of the refined cotton is 2000-4000.

[0078] 3), the alkalization of cellulose: the liquid caustic soda that 600g concentration is 49.3% and the alcohol of 1200ml concentration are 93% are joined in the kneader by the mode of spraying, carry out the alkalization of cellulose, pass through in the whole alkalization process Control the temperature of cooling water at 15°C-40°C, pass N 2 Protection, alkalization time is 60min.

[0079] 4) Mixing of cellulose...

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Abstract

The invention discloses a preparation method of high viscosity polyanion cellulose. The preparation method takes purified cotton as cellulose raw material and comprises the following steps: (a) the alkalization of the cellulose, (b) the etherifying agent mixture of the cellulose, (c) the etherification of the cellulose, (d) neutralization washing, (e) the postprocessing of product and a cross-linking reaction step. The cross-linking reaction step is between the step b the etherifying agent mixture of the cellulose and the step c the etherification of the cellulose. The cross-linking reaction step relates to that cross-linking agent N, N'-methylene-bis-acrylamide is added to the cellulose for the cross-linking reaction. The method solves the problems of low viscosity, bad salt tolerance and high filter loss of the traditional polyanion cellulose preparation method.

Description

technical field [0001] The invention relates to a preparation method of polyanion cellulose, in particular to a preparation method of high viscosity polyanion 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 has been widely used in industry as a thickener. 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 hig...

Claims

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Application Information

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IPC IPC(8): C08B15/10C08B11/00
Inventor 丁长光王文涛朱宏彬袁和平丁长银张强聂熙金
Owner 上海长光企业发展有限公司
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