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Viscoelastic system constructed by functional Gemini surfactants and preparation method of viscoelastic system

A surfactant and viscoelastic technology, applied in the field of viscoelastic surfactant solution, can solve the problems of high cost and high concentration of surfactant

Active Publication Date: 2015-05-27
陕西日新石油化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the concentration of simple surfactants is relatively high and the cost is high, the invention provides a method for preparing a viscoelastic surfactant solution obtained by compounding anionic and cationic surfactants

Method used

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  • Viscoelastic system constructed by functional Gemini surfactants and preparation method of viscoelastic system
  • Viscoelastic system constructed by functional Gemini surfactants and preparation method of viscoelastic system
  • Viscoelastic system constructed by functional Gemini surfactants and preparation method of viscoelastic system

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1: the synthesis of α-bromotetradecanoic acid methyl ester. Add tetradecanoic acid (150g, 0.6568mol) into a 500ml three-necked flask, melt at 65°C, slowly add thionyl chloride (106.6g, 0.821mol) dropwise under stirring, raise the temperature to 90°C after the dropwise addition, add A little elemental iodine was used as an initiator, and liquid bromine (131.2g, 0.821mol) dried by concentrated sulfuric acid was slowly added dropwise, stirred and refluxed for 12 hours, and the temperature was lowered to 65°C, and anhydrous methanol (52.6g, 1.64mol) was added dropwise with stirring. mol), reflux for 2-4 hours after the addition. After cooling, wash with water 3-4 times, then wash the organic layer with 50 ml of saturated sodium sulfite solution until neutral, and finally wash with water 3-4 times. The organic layer was dried overnight by adding anhydrous magnesium sulfate. After filtration, the crude product was distilled under reduced pressure to obtain α-brom...

Embodiment 2

[0017] Embodiment 2: the synthesis of Gemini cationic surfactant. Mix 200 mL of absolute ethanol, 1-bromododecane (100 g, 0.4 mol), and diethanolamine (170 g, 1.62 mol), and react at 60° C. for 48 h. After cooling, sodium hydroxide (20 g, 0.5 mol) was added and stirring was continued for 1 h. After the ethanol was removed by rotary evaporation, 150 mL of distilled water and 100 mL of diethyl ether were added to the residue, and the system was separated into layers. The upper organic layer was separated, and the lower layer was extracted twice with diethyl ether. The extracts were combined and washed twice with distilled water. The ether solution was dried over anhydrous magnesium sulfate, filtered and removed by rotary evaporation of ether. The residue was distilled under reduced pressure to obtain N-dodecyldiethanolamine as a colorless viscous liquid (180°C / 5mmHg).

[0018] N-dodecyldiethanolamine (20g, 0.073mol), 1,3-dibromopropane (6.6g, 0.033mol) and 20mL of absolute e...

Embodiment 3

[0019] Embodiment 3: the preparation of viscoelastic surfactant solution. Prepare 5ml of Gemini cationic surfactant solution of 50mmol / L, and add appropriate amount of sodium dodecanoate, sodium myristate and sodium palmitate solid to it respectively to make Gemini cationic surfactant and sodium dodecanoate and sodium myristate The molar ratios of sodium palmate reached 1:0.1, 1:0.2, 1:0.3 and 1:0.4 respectively, and the molar ratios of Gemini cationic surfactant and sodium hexadecanoate reached 1:0.1, 1:0.2, 1:0.3, 1:0.4 and 1:0.5. After dissolving, a series of viscoelastic surfactant solutions are obtained.

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Abstract

The invention relates to a method for preparing a viscoelastic surfactant solution obtained by complexing a cationic surfactant and three anionic surfactants of different chain lengths. The anionic surfactants can be any one of sodium laurate (SL), sodium myristate (SM) and sodium palmitate (SP). The viscoelastic surfactant solution is prepared by compounding a Gemini surfactant with a hydroxyl as a main component and a small amount of anionic surfactants. The preparation of the surfactant solution comprises two main processes, namely compounding and testing the viscoelastic performance. Specifically, the Gemini cationic surfactant is prepared into a solution of a certain concentration and the solution is complexed with the anionic surfactants according to different ratios, so that the viscoelastic surfactant solution can be obtained.

Description

technical field [0001] The invention relates to a viscoelastic surfactant solution obtained by compounding a cationic surfactant and an anionic surfactant, in particular to a viscoelastic solution containing a Gemini surfactant component of a functional group and its compounding Methods, belonging to the field of surfactant science. Background technique [0002] Gemini surfactants contain two head groups, two hydrophobic chains and one linking chain. By changing its structural elements, such as introducing functionalized groups on the head group, worm micelles are formed. The common worm-like micelles are Yin / cationic surfactant system, surfactant / salt system, etc. The most obvious feature of worm-like micelles is that the long micelles are entangled with each other, making the system viscoelastic. [0003] Worm-like micelles have important applications in people's daily life and production, such as oilfield fracturing fluid, drag reducer, thickening of daily detergent...

Claims

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Application Information

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IPC IPC(8): B01F17/38B01F17/18C09K23/38C09K23/18
Inventor 裴晓梅刘喆宋冰蕾舒彩云
Owner 陕西日新石油化工有限公司
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