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Preparation method and application of low temperature resistance type shear thickening fluid

A low-temperature-resistant, liquid-resistant technology, applied in the field of low-temperature-resistant materials, can solve the problems of failure of shear thickening behavior and limit the application range of shear thickening liquid, and achieve the effect of stable solution, large flexibility and small thermal conductivity

Active Publication Date: 2018-06-29
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since protective materials are often used in harsh low-temperature environments, current shear-thickening fluids will freeze in low-temperature environments, resulting in failure of shear-thickening behavior, which greatly limits the application range of shear-thickening fluids

Method used

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  • Preparation method and application of low temperature resistance type shear thickening fluid
  • Preparation method and application of low temperature resistance type shear thickening fluid
  • Preparation method and application of low temperature resistance type shear thickening fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of preparation method of low temperature resistance type shear thickening liquid, described preparation method comprises the following steps:

[0023] (1) Add 80 parts of a mixture of polyether polyol 8000 and 20 parts of silicone oil containing 0.01% of anionic surfactant AS-1, and 2 parts of polytetrafluoroethylene into a three-necked flask, mix well, and prepare a mixed dispersion medium;

[0024] (2) 300 parts of SiO with a particle size of 20nm 2 Put the particles in a 1000mL four-necked flask, add 250mL anhydrous toluene and 5mL 3-aminopropyltrioxymethylsilane, and mix them ultrasonically for 30 minutes, reflux at 110°C, and magnetically stir for 24 hours; , ethanol, acetone repeatedly washed; then vacuum-dried at 50°C to obtain positively charged micro-nano spherical silica particles;

[0025] (3) Add the positively charged micro-nano spherical silica particles prepared in step (2) into the mixed dispersion medium prepared in step (1), and use a ribbon s...

Embodiment 2

[0028] A kind of preparation method of low temperature resistance type shear thickening liquid, described preparation method comprises the following steps:

[0029] (1) Add 60 parts of a mixture of polyether polyol 8000 and 40 parts of silicone oil containing 0.01% of anionic surfactant AS-1, and 2 parts of polytetrafluoroethylene into a three-necked flask, mix well, and prepare a mixed dispersion medium;

[0030] (2) 400 parts of SiO with a particle size of 20nm 2 Put the particles in a 1000mL four-necked flask, add 250mL anhydrous toluene and 5mL 3-aminopropyltrioxymethylsilane, and mix them ultrasonically for 30 minutes, reflux at 110°C, and magnetically stir for 24 hours; , ethanol, acetone repeatedly washed; then vacuum-dried at 50°C to obtain positively charged micro-nano spherical silica particles;

[0031] (3) Add the positively charged micro-nano spherical silica particles prepared in step (2) into the mixed dispersion medium prepared in step (1), and use a ribbon s...

Embodiment 3

[0034] A kind of preparation method of low temperature resistance type shear thickening liquid, described preparation method comprises the following steps:

[0035] (1) Add 50 parts of a mixture of polyether polyol 8000 and 50 parts of silicone oil containing 0.01% of anionic surfactant AS-1, and 2 parts of polytetrafluoroethylene into a three-necked flask, mix well, and prepare a mixed dispersion medium;

[0036] (2) 480 parts of SiO with a particle size of 20nm 2 Put the particles in a 1000mL four-necked flask, add 250mL anhydrous toluene and 5mL 3-aminopropyltrioxymethylsilane, and mix them ultrasonically for 30 minutes, reflux at 110°C, and magnetically stir for 24 hours; , ethanol, acetone repeatedly washed; then vacuum-dried at 50°C to obtain positively charged micro-nano spherical silica particles;

[0037] (3) Add the positively charged micro-nano spherical silica particles prepared in step (2) into the mixed dispersion medium prepared in step (1), and use a ribbon s...

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Abstract

The invention discloses a preparation method of a low temperature resistance type shear thickening fluid. The preparation method comprises the following steps of (1) adding 300-480 parts by mass of micro-nano spherical silicon dioxide particles with positive charges in 100-250 by mass parts of dispersion medium at the temperature of 25-55 DEG C, adding 2 parts by mass of polytetrafluoroethylene powder, stirring by using a helical ribbon impeller at a rotational speed of 800r / min, and performing dispersion for 30-80mins to obtain a uniform dispersion liquid; and (2) then putting the dispersionliquid obtained in the step (1) in a vacuum oven, performing standing for 5-15h at the temperature of 25-55 DEG C to obtain the shear thickening fluid with remarkable low temperature resistance effect. The preparation method provided by the invention solves the problem that a normal shear thickening fluid is in failure caused by freezing at low temperature, and a flexible protective material prepared by the shear thickening fluid makes great breakthroughs in the aspects of application range and use conditions.

Description

technical field [0001] The invention relates to the technical field of low temperature resistant materials, in particular to a method for preparing a low temperature resistant shear thickening liquid by using micronano spherical silica particles and its application. Background technique [0002] Shear thickening liquid is a state of liquid or disperse colloid under normal circumstances. When it is subjected to a critical shear or impact, its viscosity rises rapidly, showing the general resistance of a solid. When the external force is removed, the shear thickening fluid returns to its original state, which is a reversible non-Newtonian fluid behavior. The unique shear thickening properties make STF widely used in various protective materials. Since protective materials are often used in harsh low-temperature environments, current shear-thickening liquids will freeze in low-temperature environments, resulting in failure of shear-thickening behavior, which greatly limits the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/256D06M11/79D06M15/643D06M15/53D06M101/20
CPCD06M11/79D06M15/256D06M15/53D06M15/643D06M2101/20
Inventor 俞科静钱坤张典堂田美玲
Owner JIANGNAN UNIV
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