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Method for preparing organobentonite with low viscosity and high settling resistance

A bentonite, high anti-settling technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as insufficiency and achieve the effect of promoting dispersion

Inactive Publication Date: 2014-07-23
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional process of preparing organic soil from sodium-based soil, the present invention provides a new idea to obtain organic soil, that is, firstly prepare hydrogen-based soil and then use quaternary ammonium cations to replace the interlayer hydrogen ions of montmorillonite. To prepare organoclay, the more critical thing is that the existence of acidic atmosphere is beneficial to change the charge distribution on the end surface of montmorillonite, which can be obtained only by Conventional stirring can break the cardboard structure of montmorillonite end surface adsorption, promote the dispersion of montmorillonite clusters, obtain fully hydrogenated ultrafine bentonite slurry, and solve the problem of insufficient sodium in the traditional process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In a 2000 mL beaker, add 20.0 g of calcium-based bentonite with a montmorillonite content of 96%, add 800 mL of water, and stir for 20 min to fully wet and disperse the calcium-based bentonite. Stir at r / min for 10 h, heat to 90 °C, slowly add 100 mL hot water solution of 10.0 g dihexadecyldimethylammonium chloride and 7.2 g dihexadecylmethylbenzyl ammonium chloride under stirring , the addition was completed within about 0.5 h, after the addition was completed, continue to stir for 0.5 h, filtered, dried at 110 °C for 5 h, pulverized, and sieved with 250 mesh to obtain the product. The tested product is in xylene (xylene / organic soil / 95% ethanol: 94 g / 4 g / 2.5ml): viscosity is 1.3 Pa.S; anti-sedimentation performance is 98 mL / 1.5g.

Embodiment 2

[0019] In a 2000 mL beaker, add 20.0 g of sodium bentonite with a montmorillonite content of 96%, add 1000 mL of water, stir for 20 min, add 2.0 mL of 10% sulfuric acid, stir for 3 h at a speed of 300 r / min, and heat to 70 ℃, slowly add 10.0 g dihexadecyl dimethyl ammonium chloride and 7.2 g dihexadecyl methyl benzyl ammonium chloride 100 mL hot water solution under stirring, the addition is completed within about 0.5 h, add Continue stirring for 0.5 h after completion, filter, dry at 110°C for 5 h, pulverize, and sieve with 250 mesh to obtain the product. The tested product is in xylene (xylene / organic soil / 95% ethanol: 94 g / 4 g / 2.5ml): viscosity is 0.96 Pa.S; anti-sedimentation performance is 98 mL / 1.5g.

Embodiment 3

[0021] In a 2000 mL beaker, add 1000 mL of calcium-based bentonite suspension with a montmorillonite content of 98% (solid content: 2.0%), add 1000 mL of water, and stir for 20 min to fully wet and disperse the calcium-based bentonite. Add 3.0 mL 85% phosphoric acid, stirred at a speed of 500 r / min for 6 h, heated to 70 °C, slowly added 9.5 g of dioctadecyl dimethyl ammonium chloride and 8.0 g of hexadecyl octadecyl di Add 100 mL of hot water solution of methyl ammonium chloride within about 0.5 h, continue stirring for 0.5 h after the addition, filter, dry at 110°C for 5 h, pulverize, and sieve with 250 mesh to obtain the product. The tested product is in xylene (xylene / organic soil / 95% ethanol: 94 g / 4 g / 2.5ml): viscosity is 0.92 Pa.S; anti-sedimentation performance is 99 mL / 1.5g.

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Abstract

The invention relates to a method for preparing organobentonite with low viscosity and high settling resistance. The method comprises the following brief steps: adding 0-50 parts of water into an aqueous suspension of purified sodium-based bentonite, calcium-based bentonite or magnesium-based bentonite, and fully stirring the aqueous suspension for wetting to obtain a suspension; adding 0.02-0.5 parts (based on the weight of the bentonite) of acid, and stirring for 0.5-10h at the revolution speed of 50-500r / min to obtain hydrogen-based superfine bentonite slurry; and heating the hydrogen-based superfine bentonite slurry to 40-90 DEG C, performing organic compound modification with strong stirring, then performing filter pressing, drying, crushing and packing to obtain the organobentonite with low viscosity and high settling resistance. The preparation method has the characteristics of simple process operation, high efficiency and easiness in industrialization. The organobentonite product has the following indexes in a dimethyl benzene solvent (dimethyl benzene / organic soil / 95% ethanol: 94g / 4g / 2.5mL): the viscosity is not more than 1.5Pa.S; and the settling resistance is more than 97mL / 1.5g.

Description

technical field [0001] The invention relates to a preparation method of low viscosity and high anti-settling organic bentonite. Background technique [0002] Organic bentonite is a new field of fine chemicals developed in recent years. It is widely used and is an indispensable additive in paint, coating, petroleum, cosmetics and other industries. Used as an anti-sedimentation aid in paints to prevent pigments from sinking to the bottom and agglomerating; used in emulsions as a flow rate control agent; used in solvent-based inks as a thickening aid to adjust the viscosity and consistency of inks , to prevent ink from spreading and improve thixotropy; used in oil drilling, it can be used as an oil-based mud additive to increase mud consistency, mud dispersibility and suspension; at the same time, it can also be used as a leveling agent and fabric softener in the textile industry middle. [0003] Bentonite is a clay mineral mainly composed of montmorillonite mineral, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/44
Inventor 盛卫坚蒋乐高高建荣贾建洪马敏陈志珏杨帆
Owner ZHEJIANG UNIV OF TECH
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