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Preparation method of nano silica shear thickening fluid

A nano-silica, liquid technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of uneven dispersion and poor stability of nano-silica shear thickening liquid, and achieve good monodispersion properties, uniform distribution of particles, and the effect of reducing the viscosity of the liquid

Inactive Publication Date: 2017-12-22
湖南沃美新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing nano-silica shear thickening liquid is unevenly dispersed and has poor stability

Method used

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  • Preparation method of nano silica shear thickening fluid
  • Preparation method of nano silica shear thickening fluid

Examples

Experimental program
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Embodiment 1

[0029] This embodiment provides a method for preparing a nano-silica shear thickening liquid, and the schematic diagram of its preparation process is as follows: figure 1 shown. The preparation method includes: (1) heating 100g of polyethylene glycol to 100°C; (2) adding 120g of nano silicon dioxide, stirring and mixing for 10 minutes; (3) adding 1.2g of silane coupling agent KH560, stirring and mixing at high speed for 30 Minutes, wherein, the stirring speed is 600-1000r / min; (4) sealing, cooling to room temperature to obtain a shear thickening liquid. figure 2 It is the SEM picture of nano-silica. It can be seen from the topography that the shape of silica is spherical, the particle distribution is uniform, the size is uniform, and it has good monodispersity.

[0030] The viscosity of the shear thickening liquid prepared in this example is 10cPs-15cPs (at 25°C, since the viscosity of the shear thickening liquid is greatly affected by external force, the external force here...

Embodiment 2

[0032] This embodiment provides a method for preparing a nano-silica shear thickening liquid, and the schematic diagram of its preparation process is as follows: figure 1shown. The preparation method includes: (1) heating 100g of polyethylene glycol to 80°C; (2) adding 120g of nano silicon dioxide, stirring and mixing for 20 minutes; (3) adding 6.8g of silane coupling agent KH570, stirring and mixing at high speed for 30 minutes Minutes, wherein, the stirring speed is 600-1000r / min; (4) sealing, cooling to room temperature to obtain a shear thickening liquid.

[0033] The viscosity of the shear thickening liquid prepared in this embodiment is 10cPs-15cPs. The drop weight test in Example 1 was carried out using the shear thickening liquid prepared in this example, and the eggs were not broken or cracked. The shear thickening liquid prepared in this embodiment has good impact resistance and can effectively play a buffering role.

Embodiment 3

[0035] This embodiment provides a method for preparing a nano-silica shear thickening liquid, and the schematic diagram of its preparation process is as follows: figure 1 shown. The preparation method includes: (1) heating 100g of polyethylene glycol to 140°C; (2) adding 120g of nano silicon dioxide, stirring and mixing for 10 minutes; (3) adding 0.22g of silane coupling agent KH560, stirring and mixing at high speed for 30 Minutes, wherein, the stirring speed is 600-1000r / min; (4) sealing, cooling to room temperature to obtain a shear thickening liquid.

[0036] The viscosity of the shear thickening liquid prepared in this embodiment is 10cPs-15cPs. The drop weight test in Example 1 was carried out using the shear thickening liquid prepared in this example, and the eggs were not broken or cracked. The shear thickening liquid prepared in this embodiment has good impact resistance and can effectively play a buffering role.

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Abstract

The invention provides a preparation method of nano silica shear thickening fluid. The method comprises the following steps: heating and dispersing a medium to 80 to 140 DEG C, adding nano silica microspheres into the medium, and stirring and mixing for 5 minutes to 1 hour; then adding a silane coupling agent for stirring and mixing, sealing, and cooling to room temperature, thus obtaining a finished product. According to the preparation method provided by the invention, a mode of directly heating to disperse the medium is adopted and the mixing operation is realized by stirring, so that the viscosity of the nano silica shear thickening fluid can be reduced, dispersity and stability of liquid are improved, and the preparation efficiency is improved; in addition, no other impurities are introduced. The preparation method provided by the invention is simple in operation and is convenient for large-scale production.

Description

technical field [0001] The invention relates to the field of liquid protective materials, more specifically, to a preparation method of nano silicon dioxide shear thickening liquid. Background technique [0002] Shear thickening liquid is a new type of intelligent anti-impact material, which is in a liquid state under normal conditions. When subjected to high-speed shear or external impact, the viscosity and strength of the material increase rapidly, and the liquid state changes into a solid state to achieve energy absorption protection. Effect. N.J.Wagner and others at the University of Delaware in the United States first proposed the idea of ​​using this shear thickening fluid to prepare protective armor. The composite material prepared by combining cutting thickening fluid and aramid (Kevlar) fiber cloth, while not reducing the flexibility of the raw material cloth, its ballistic performance is greatly improved, the performance of knife stab resistance is slightly improv...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 陈卓罗世彬裘航胜
Owner 湖南沃美新材料科技有限公司