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Shear thickening material with both solid and liquid properties and application of preparation method thereof

A liquid and solid technology, applied in textiles, papermaking, fiber processing, etc., can solve the problems of unstable thickening liquid system, strong hygroscopicity, and resistance to shearing, and achieve excellent shear thickening and high comfort , the effect of increasing the loading capacity

Active Publication Date: 2020-09-15
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the shear thickening liquid used for protective materials is mostly composed of polyethylene glycol and nano-silica particles. However, due to the strong hygroscopicity of polyethylene glycol, the thickening liquid system is unstable and not resistant to shearing.

Method used

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  • Shear thickening material with both solid and liquid properties and application of preparation method thereof
  • Shear thickening material with both solid and liquid properties and application of preparation method thereof
  • Shear thickening material with both solid and liquid properties and application of preparation method thereof

Examples

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preparation example Construction

[0040] The present invention also provides the preparation method of the shear thickening material with both solid and liquid properties according to the above technical solution, which is characterized in that it includes the following steps:

[0041] Mixing polyethylene glycol and silica nanoparticles to obtain a shear-thickening liquid matrix;

[0042] The gelling factor is mixed with the shear-thickening liquid matrix at 90-120° C., and then gelation reaction is performed to obtain a shear-thickening material with both solid and liquid properties.

[0043] In the present invention, polyethylene glycol and silica nanoparticles are mixed to obtain a shear-thickening liquid matrix.

[0044] In the present invention, the mixing of the polyethylene glycol and the silica nanoparticles is preferably by adding the silica nanoparticles into the polyethylene glycol; the addition of the silica nanoparticles is preferably slow and batchwise addition. The slow batch addition described...

Embodiment 1

[0053] Preparation of gelling factors:

[0054] Put hexadecanol, p-toluenesulfonic acid monohydrate, and alanine in a round-bottomed flask in a molar ratio of 1:1.2:1, add 200 mL of toluene solvent, heat under reflux and carry out water separation treatment for 10 hours, and then steam under reduced pressure. solvent, the oily residue was dissolved in chloroform, the pH was adjusted to neutrality with sodium carbonate, the organic phase was collected and dried with anhydrous magnesium sulfate overnight; the organic phase was separated and the solvent was evaporated again, the residue was dissolved in 10 mL of concentrated hydrochloric acid In 200 mL of acetone, freeze to obtain white amino acid alkyl pure ester hydrochloride; redissolve the obtained amino acid alkyl alcohol ester hydrochloride into acetone solution, freeze to -10 °C to precipitate a precipitate, and then dissolve the precipitate in chloroform , the pH was adjusted to neutrality with sodium carbonate solution, ...

Embodiment 2

[0062] According to the method of Example 1, the addition amount of the gelling factor was replaced by 0.025 g to prepare a shear thickening material with both solid and liquid properties.

[0063] The steady-state rheology curve of the shear-thickening material with both solid and liquid properties obtained in this example is tested, and the results are as follows image 3 shown. Depend on image 3 It can be seen that the rheological properties of the shear-thickening material obtained in this example are similar to those of the shear-thickening material obtained in Example 1, and its maximum shear viscosity can reach 25 Pa s, which is similar to that of the shear thickening material without the addition of gelling factor. Compared with the shear thickening liquid matrix and the gelation shear thickening liquid prepared in Example 1, the shear thickening material obtained in this example has more obvious shear thickening phenomenon.

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Abstract

The invention provides a shear thickening material with both solid and liquid properties and an application of a preparation method thereof, and belongs to the technical field of functional materials.The shear thickening material comprises a shear thickening fluid matrix and a gelator, and the shear thickening fluid matrix comprises polyethylene glycol and silicon dioxide nanoparticles. Accordingto the shear thickening material provided by the invention, the gelator is added to a traditional shear thickening material, so that the obtained shear thickening material exhibits a solid state in astatic state; compared with traditional liquid shear thickening fluid, the hygroscopicity is obviously reduced, so that the stability and the shear resistance of the shear thickening fluid are improved; when subjected to a small shear stress, the shear thickening material exhibits a liquid state, so that a protective material has higher comfort during the wearing process, and when subjected to alarge shear stress, the shear thickening material exhibits an excellent shear thickening phenomenon and plays a role in protection. Compared with traditional shear thickening fluid, the shear thickening material obtained in the invention exhibits more excellent shear thickening performance.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a shear thickening material with both solid and liquid properties, a preparation method and application thereof. Background technique [0002] Shear thickening fluid is a typical non-Newtonian fluid, mostly composed of dispersion medium and micro-nano particles with relatively uniform particle size. At a low impact energy density, it is in a flowing state and exhibits a certain shear thinning phenomenon; when the impact energy density exceeds a certain critical value, an obvious shear thickening phenomenon occurs, and the shear viscosity increases exponentially. , showing the hard characteristics of solid materials to achieve the purpose of energy dissipation. Initially, such monodisperse micro-nanoparticles were dispersed in polar solvents, and the prepared suspensions exhibited shear-thickening phenomena, resulting in detrimental effects such as blockage of transm...

Claims

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Application Information

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IPC IPC(8): D06M15/53D06M11/79D06M13/432
CPCD06M11/79D06M13/432D06M15/53
Inventor 周峰杨武芳于强亮裴小维吴杨
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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