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Preparation method of cutting thickening liquid

A liquid and emulsion technology, applied in clothing, clothing, protective clothing, etc., can solve problems such as charge accumulation, achieve strong shear thickening effect, and weaken the effect of electrostatic repulsion

Inactive Publication Date: 2019-01-11
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, SiO2 has small size effect and surface effect, and a large amount of positive and negative charges are accumulated on the surface, and the shape of nanoparticles is extremely irregular, which causes the accumulation of charges.

Method used

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Examples

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Effect test

Embodiment 1

[0013] A method for preparing a thickening liquid, 1000 parts of polyethylene glycol, 600 parts of modified nano-silica core-shell particles, added to the above mixed solution under stirring and ultrasonication, stirring and ultrasonic dispersion for 1-2 hours until A uniform emulsion was formed, and the emulsion was placed in a vacuum drying oven for 24 hours to remove air bubbles in the dispersion system and obtain a shear-thickened liquid. The maximum viscosity of the prepared shear thickening liquid is 1298.2Pa·s.

[0014] The preparation method of modified nano-silica core-shell particles is as follows:

[0015] Using 0.1mol / L hydrochloric acid solution and deionized water to fully wash the nano-silica particles successively, filter, and vacuum-dry to obtain acidified nano-silica powder;

[0016] Step 2, take 500g of the SiO2 powder obtained after the above pickling and add it into a mixed alkali solution containing 0.4mol of sodium hydroxide and 0.1mol of carbonamide an...

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Abstract

The invention discloses a preparation method of cutting thickening liquid, wherein polyethylene glycol and modified nanometer silicon dioxide core-shell particles are added into the mixed solution under the action of stirring and ultrasonic waves, are stirred and dispersed under ultrasonic waves for 1-2 hours until a homogeneous emulsion is formed, and the emulsion is placed in a vacuum drying oven and left standing for 24 hours to remove bubbles in the dispersion and obtain a shear thickening liquid. The modified nano-SiO2 core-shell particles are NiAl-LDH / SiO2 nanoparticles. The modified nano-silica core-shell particles are used as the disperse phase, and the modified nano-silica core-shell particles are used as the disperse phase through NiAl-LDH layered bimetallic hydroxides coated onthe surface of SiO2 formed a polymer layer on the surface of SiO2 microspheres. The electrostatic repulsion between particles is weakened by polymer oxide layer to some extent. The core-shell ions ofSiO2 can come closer to each other and form larger particle clusters under the shear action, which results in stronger shear thickening effect.

Description

technical field [0001] The invention relates to a preparation method of cutting and thickening liquid. Background technique [0002] Shearthickening fluid (STF) is a new type of functional material, which is a nano-particle solvent in a solid-liquid mixed state. Usually, nano-SiO2 is used as a dispersed phase, and polar solvents (polyethylene glycol, polypropylene glycol, Glycerin, etc.) as a dispersion medium to form a nano-SiO2 dispersion system. Under high-speed impact, the apparent viscosity changes dramatically, and even changes from a liquid phase to the same phase, showing strong impact resistance; after the impact force is eliminated, it quickly changes from a solid phase to a liquid phase. At present, shear thickening liquid has been gradually introduced into personal protective armor. The key technology of its application is to prepare a dispersion system with rheological properties of first shear thinning and then shear thickening, in order to ensure the normal a...

Claims

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Application Information

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IPC IPC(8): A41D31/24
Inventor 高光珍赵岩程琳琳
Owner XUZHOU NORMAL UNIVERSITY
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