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A kind of preparation method of organic bentonite modified by fatty acid amide

A technology of fatty acid amide and bentonite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of low gelation rate, easy agglomeration, uneven particle size, etc., and achieve high gelation rate and anti-sedimentation Good performance and small particle size

Inactive Publication Date: 2018-01-05
ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is reported in the literature that quaternary ammonium salt cationic surfactants with carbon atoms between 12 and 18 are commonly used, such as hexadecyltrimethylammonium chloride (bromide) ammonium, octadecyltrimethylammonium chloride (bromide) ammonium As an organic modifier to prepare organic bentonite, this kind of organic bentonite modified with a single quaternary ammonium salt is easy to agglomerate, resulting in uneven particle size, poor anti-sedimentation ability, and low gelation rate, which affects the film-forming properties of construction and cannot meet the requirements. High-quality product quality requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing organic bentonite modified by fatty acid amide in this embodiment, bentonite is prepared by organic modification once:

[0022] (1) Disperse 5g of calcium-based bentonite in 95g of deionized water, stir evenly, let stand for 0.5h, take 20ml of the upper liquid, and mark it as liquid A. The lower layer is the suspension of bentonite, marked as liquid B.

[0023] (2) In step (1) A solution, first add 5g of ethanol, after stirring evenly, add 0.5g of dodecyltrimethylammonium bromide, 21g of octadecyltrimethylammonium chloride, 0.5g Behenic acid amides, stirred to make them fully dissolved, prepared into surfactant emulsion, marked as liquid C.

[0024] (3) Mix liquid B and liquid C, stir at a constant temperature of 25°C, undergo an organic modification reaction for 3 hours, cool, wash with deionized water, centrifuge, dry, and then pulverize to make organic bentonite. After testing, 2% of the sample was added to xylene, stirred at a high speed of ...

Embodiment 2

[0026] A method for preparing organic bentonite modified by fatty acid amide in this embodiment, bentonite is prepared by organic modification once:

[0027] (1) Disperse 6g of sodium bentonite in 94g of deionized water, stir evenly, let it stand for 2 hours, take 30ml of the upper liquid, and mark it as liquid A. The lower layer is the suspension of bentonite, marked as liquid B.

[0028] (2) In step (1) A solution, first add 10g of ethanol, after stirring evenly, add 1.5g of tetradecyltrimethylammonium bromide, 15g of octadecyltrimethylammonium chloride, 4g of mustard Acid amides, stirred to make them fully dissolved, prepared into surfactant emulsion, marked as liquid C.

[0029] (3) Mix liquid B and liquid C, stir evenly, and react for organic modification at a constant temperature of 35°C for 4 hours, then cool, wash with deionized water, centrifuge, dry, and then pulverize to make organic bentonite. After testing, 2% of the sample was added to xylene, stirred at a high...

Embodiment 3

[0031] A method for preparing organic bentonite modified by fatty acid amide in this embodiment, bentonite is prepared by organic modification once:

[0032] (1) Disperse 7g of sodium bentonite in 93g of deionized water, stir evenly, let it stand for 3 hours, take 40ml of the upper liquid, and mark it as liquid A. The lower layer is the suspension of bentonite, marked as liquid B.

[0033] (2) In step (1) A liquid, first add 20g of ethanol, after stirring evenly, add 1g of tetradecyltrimethylammonium chloride, 3g of cetyltrimethylammonium bromide, 10g of octadecyltrimethylammonium Alkyltrimethylammonium chloride and 6g of oleic acid amide were stirred to make them fully dissolved and prepared into a surfactant emulsion, which was marked as liquid C.

[0034] (3) Mix liquid B and liquid C, stir at a constant temperature of 45°C, undergo an organic modification reaction for 8 hours, cool, wash with deionized water, centrifuge, dry, and then pulverize to make organic bentonite. ...

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PUM

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Abstract

The invention discloses a preparation method of organobentonite modified with fatty acid amide. The method includes the following steps that bentonite, an alkyl trimethyl quaternary ammonium salt cationic surfactant with the carbon chain length of 12-16, an octadecyl trimethyl quaternary ammonium salt cationic surfactant, a fatty acid amide nonionic surfactant, ethyl alcohol and deionized water are mixed to form a mixture, then the mixture is subjected to an organizing reaction with primary organic modification or secondary organic modification, and the product is washed, centrifuged, dried and smashed to be prepared into organobentonite. Organobentonite produced with the method has a high colloidization rate in xylene and is good in settling resistance and small in particle size, wherein the colloid rate reaches 99% or above, and the scraper fineness is smaller than or equal to 10 micrometers and is uniform.

Description

technical field [0001] The invention relates to a preparation method of organic bentonite modified by fatty acid amide, in particular to self-activated organic bentonite with high gelation rate, easy dispersion and small fineness in xylene. Background technique [0002] Bentonite is a natural aluminosilicate with a layered structure with montmorillonite as the main non-metallic mineral component. It has water swelling, cohesiveness, hydrophilicity and cation exchange properties. Utilizing the special lamellar structure of montmorillonite in bentonite, the exchangeability of interlayer cations and the richness of hydroxyl groups in the laminates and end faces, various organic modification can be prepared by cation exchange, surface grafting, physical adsorption modification and other technologies. of bentonite (organic bentonite). Organobentonite can form colloids or gels in various organic solvents, oils, and liquid resins, and has good thickening, thixotropy, suspension st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/44
CPCC01B33/44C01P2004/61
Inventor 俞卫华周春晖童东绅张彤
Owner ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
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