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Shear thickening liquid/bacterial cellulose-silica composite material and preparation method thereof

A technology of bacterial cellulose and silicon dioxide, which is applied in the field of shear thickening liquid/bacterial cellulose-silica composite material and its preparation, can solve the problems of poor fluidity, high resistance and high viscosity, and achieves a wide range of sources. , Improve rheological properties, enhance the effect of shear thickening

Inactive Publication Date: 2020-02-07
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the concentration of silica is high, the solid phase content is high, there are more silica particles, and the remaining free-flowing dispersion medium between them is less, and the fluidity is poor, resulting in greater viscosity. High resistance, difficult to form a uniformly dispersed shear thickening liquid

Method used

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  • Shear thickening liquid/bacterial cellulose-silica composite material and preparation method thereof
  • Shear thickening liquid/bacterial cellulose-silica composite material and preparation method thereof
  • Shear thickening liquid/bacterial cellulose-silica composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Mix 34g TEOS with 100g water, add 33ml acetic acid (0.1mol / L) and mix and stir for 1 hour. The concentration of TEOS in water is 25%. Then soak the flocculent BC in the solution for 48 hours to obtain BC-SiO 2 composite material.

[0023] Step 2: under stirring, gradually add 56 g of nano-silica particles (that is, the mass fraction of silicon dioxide is 28%) into 144 g of polyethylene glycol 200, continue stirring for 5 minutes, and then ultrasonically disperse for 60 minutes. The prepared shear thickening fluid (STF) was placed in a vacuum drying oven, and air bubbles were removed at 0.1 Mpa to obtain a relatively stable shear thickening fluid.

[0024] The third step: under the action of ultrasound, the flocculent BC-SiO 2 The composite material was mechanically stirred in the shear thickening solution for 30min to obtain the shear thickening solution / bacterial cellulose-silica (STF / BC-SiO 2 ) composite material.

[0025] The bacteria cellulose-silicon di...

Embodiment 2

[0027] This example is basically the same as Example 1, the only difference is that the mass of polyethylene glycol 200 in step 2 is 160g, and the mass of silicon dioxide is 40g, that is, the mass fraction of silicon dioxide is 20%.

[0028] The shear thickening liquid / bacterial cellulose-silicon dioxide (STF / BC-SiO2 that embodiment 2 obtains 2 ) composites, bacterial cellulose-silica (BC-SiO 2 ) the loading capacity of silicon dioxide in the composite material is 70%, and the massfraction of silicon dioxide in the shear thickening liquid is 20%, and the gained shear thickening liquid / bacterial cellulose-silicon dioxide (STF / BC-SiO 2 ) The rheological properties of the composite material are slightly lower than the rheological properties of the shear thickening solution obtained in Example 1.

Embodiment 3

[0030] This embodiment is basically the same as Example 1, the only difference being that the mass concentration of tetraethyl orthosilicate in step 1 is 30%, that is, bacterial cellulose-silicon dioxide (BC-SiO 2 ) The loading of silicon dioxide in the composite material is 80%.

[0031] The shear thickening liquid / bacterial cellulose-silicon dioxide (STF / BC-SiO2 that embodiment 3 obtains 2 ) composites, bacterial cellulose-silica (BC-SiO 2 ) the loading amount of silicon dioxide in the composite material is 80%, and the mass fraction of silicon dioxide in the shear thickening liquid is 28%. The resulting shear thickener / bacterial cellulose-silica (STF / BC-SiO 2 ) The rheological properties of the composite material are lower than those of the shear thickening solution obtained in Example 1.

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Abstract

The invention discloses a shear thickening liquid / bacterial cellulose-silica composite material and a preparation method thereof. The method firstly adopts a solvent impregnation method to obtain a BC-SiO2 composite material, adopts a mechanical stirring method to prepare the shear thickening liquid with nano-sized silica particles as a dispersion medium and polyethylene glycol as a dispersant, finally, the shear thickening liquid / bacterial cellulose-silica composite material is prepared by mechanical stirring and ultrasonic mixing methods. According to the invention, silica particles on flocculent cellulose and the nano-sized silica particles in the shear thickening liquid have synergistic effect, so that the shear thickening property of the shear thickening liquid is enhanced, the rheological property of the shear thickening liquid is significantly improved compared with that of an original shear thickening liquid, and the prepared composite material can be better applied to flexibleprotective materials.

Description

technical field [0001] The invention relates to a shear thickening solution / bacterial cellulose-silicon dioxide (STF / BC-SiO 2 ) composite material and a preparation method thereof, belonging to the field of preparation of flexible protective materials. Background technique [0002] Traditional combat protective materials are heavy, bulky, and inflexible, which greatly limit the flexibility of combat soldiers, and this type of protective material can only cover important parts of the human body such as the chest and abdomen, and is difficult for flexible parts of the human body such as joints. Protect. Therefore, it is necessary to find a flexible protective material to improve the flexibility and flexibility of the protective material. [0003] Shear thickening phenomenon, that is, the viscosity of the fluid increases with the increase of the shear rate or shear stress, and the fluid with shear thickening performance is called shear thickening fluid (Shear Thickening Fluid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08K3/36C08K5/06
CPCC08K3/36C08K5/06C08K2201/011C08K2201/014C08L1/02
Inventor 杨加志李雪菲李锦坤李文静
Owner NANJING UNIV OF SCI & TECH