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Shear thickening fluid based on ionic liquid and preparation method thereof

A technology of ionic liquid and thickening liquid, which is applied in the direction of textiles and papermaking, fiber treatment, fiber type, etc., can solve the problems of insignificant shear thickening effect and single function of STF, and achieve good shear thickening and easy The effect of simple operation and method

Inactive Publication Date: 2020-05-08
DONGHUA UNIV
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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 provide a shear thickening liquid based on ionic liquid and its preparation method, to overcome the technical defects that the STF prepared by the prior art has a single function and the shear thickening effect is not obvious. Dispersed phases of polymers with different particle sizes dispersed in ionic liquid dispersion medium

Method used

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  • Shear thickening fluid based on ionic liquid and preparation method thereof
  • Shear thickening fluid based on ionic liquid and preparation method thereof
  • Shear thickening fluid based on ionic liquid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Preparation of polymethyl methacrylate (PMMA):

[0036] Take MMA and wash it three times with 5% NaOH solution, wash it with double distilled water to neutrality, add anhydrous calcium chloride to dry, and seal the monomer in a conical flask with a ground stopper, store it in the refrigerator and let it stand for 24 hours. Then take the upper layer of MMA for later use; add 0.05g NaCl, 10g of the above-mentioned treated MMA and 60ml of deionized water into a four-necked flask equipped with a condenser, a nitrogen gas conduit and a mechanical stirrer, and pass nitrogen gas under stirring at 300rpm to drive oxygen for 15min.

[0037] 30ml of an aqueous solution of potassium persulfate (KPS) (the amount of KPS is 0.2wt.% of the amount of methyl acrylate; 0.25wt.%; 0.3wt.%; 0.35wt.%; 0.4wt.%) was added to the flask , and then the temperature was raised to 70°C to start polymerization. After reacting for 4 hours, it was cooled to room temperature, and the polymer emulsion w...

Embodiment 2

[0044] The preparation of the shear thickening liquid of different concentrations comprises the following steps:

[0045] (1) Put the three-neck flask into the ultrasonic cleaner, clamp it on the constant speed stirrer, adjust the position, and ensure that the ultrasonic cleaning is supplemented by mechanical stirring.

[0046] (2) The dispersion medium [BMIM]PF 6 (Example 1) Pour into a three-necked flask, and in the process of stirring and ultrasonic oscillation, gradually add the particle diameter synthesized in Example 1 to be 0.13 μm PMMA particles, so that it is evenly dispersed in the dispersion medium as much as possible, and the concentration of the prepared polymer particles is respectively 2wt.%, 4wt.%, 6wt.%, 8wt.%, 10wt% STF.

[0047] (3) Ultrasonic stirring and dispersing for 1 h, and the prepared sample was placed in a vacuum drying oven for 24 h at a temperature of 30° C. to remove air bubbles in the STF and obtain a stable STF system.

[0048] (4) A rotation...

Embodiment 3

[0051] The preparation of the shear thickening liquid of different particle sizes comprises the following steps:

[0052] (1) As described in embodiment 2 step (1).

[0053] (2) as described in embodiment 2 step (2), adopt PMMA particles (obtained in embodiment 1) of five groups of different particle sizes of 0.13 μm, 0.17 μm, 0.19 μm, 0.20 μm and 0.53 μm to prepare 10wt.% STF .

[0054] (3) As described in embodiment 2 step (3).

[0055] (4) As described in embodiment 2 step (4).

[0056] Result: if Figure 7 As shown, under the same dispersed phase content, the STF critical shear viscosity increases from 300.8Pa with the increase of dispersed phase particle size . s gradually decreased to 7.2Pa . s, the critical shear rate is changed from 2s -1 Gradually rise to 11s -1 , the shear thickening behavior is weakened, and the shear thickening performance is reduced.

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Abstract

The invention relates to a shear thickening fluid based on ionic liquid and a preparation method thereof. The thickening fluid contains polymer particles and imidazole ionic liquid. The preparation method is simple and easy to operate, easy to operate and free of pollution. The shear thickening liquid prepared by the method has good shear thickening property, can act on fabrics, and improves the impact resistance and the tensile property of the fabrics.

Description

technical field [0001] The invention belongs to the field of shear thickening liquid and its preparation, in particular to a shear thickening liquid based on ionic liquid and its preparation method. Background technique [0002] Shear thickening fluid (STF) is a non-Newtonian fluid, which is a concentrated particle suspension formed by dispersing nano- or micro-sized particles in a polar medium. Under appropriate shear conditions, its viscosity increases significantly with the increase of shear rate. Usually, the increase of this viscosity can reach several orders of magnitude, and the response speed is fast and the process is reversible. When the stress is removed, the fluid returns to the initial state. Under high-speed impact, STF will even change from a flowable liquid state to a solid-like state. In recent years, researchers have carried out in-depth research on the composition of STF, the factors affecting shear thickening and the mechanism of shear thickening, and h...

Claims

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Application Information

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IPC IPC(8): D06M15/263D06M13/453D06M101/36
CPCD06M13/453D06M15/263D06M2101/36
Inventor 罗艳曹传枝杜鹃
Owner DONGHUA UNIV
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