Preparation method of shearing thickened fluid based on SiO2 nano-scale microspheres

A technology of micro-nano spheres and fluids, applied in textiles, papermaking, fiber treatment, etc., can solve the problems of difficult-to-disperse particle aggregates, long preparation time, and long preparation cycle, and achieve simple process, stable product performance, and short preparation cycle Effect

Inactive Publication Date: 2012-07-11
SHENZHEN ACAD OF AEROSPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, due to micro-nano SiO 2 The silanol on the surface has a strong polarity, the agglomeration phenomenon between the dry powder particles is serious, and the degree of agglomeration is relatively strong, and the viscosity of the polymer solvent is high. It is difficult to disperse the agglomerated particle aggregates by simple physical dispersion methods such as ball milling and stirring. , even with ultrasound as a means of strengthening dispersion, it still takes a long time to prepare
And with SiO 2 The aqueous phase suspension of the particles is used as the raw material, and the method of gradually replacing the water solvent with a polymer solvent can overcome the agglomeration between particles to a certain extent by means of multiple centrifugation and redispersion, and obtain SiO 2 Shear thickening fluid with good dispersion of particles in polymer solvent, but this method still has the problems of long preparation cycle, high energy consumption, high cost, and difficulty in mass production

Method used

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  • Preparation method of shearing thickened fluid based on SiO2 nano-scale microspheres
  • Preparation method of shearing thickened fluid based on SiO2 nano-scale microspheres
  • Preparation method of shearing thickened fluid based on SiO2 nano-scale microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] SiO 2 Preparation of the micro-nanosphere suspension: respectively configure an anhydrous ethanol solution with a molar concentration of tetraethyl orthosilicate of 0.8 mol / L as the first reaction solution, and a water molar concentration of 8 mol / L and an ammonia molar concentration of 1.6 mol / L L of absolute ethanol mixed solution, as the second reaction solution. Then control the reaction temperature of the microreactor to 30°C, and at the same time send the two reaction liquids into the microreactor in equal amounts, and fully mix the reaction in the microreactor, and the reaction product is SiO 2 micronanosphere suspension. And according to the needs, an appropriate amount of water and ammonia can be added to the obtained reaction product to keep the molar concentration of water at 8mol / L and the molar concentration of ammonia at 1.6mol / L. The first reaction solution with a molar concentration of ethyl acetate of 0.8mol / L continues to react, and finally obtains S...

Embodiment 2

[0032] First, according to the method of Example 1, SiO with a D50 particle size of 360nm was prepared. 2 micronanospheres. Use a ceramic microfiltration membrane with a filter pore size of 150 nm to first clean the SiO obtained by the reaction 2 The aqueous phase suspension of micronanospheres is washed until the pH of the filtrate=7. Then stop adding distilled water, and continue to use ceramic microfiltration membrane to filter out the water in the suspension to concentrate until the solid content of the suspension is 10%.

[0033] Then, step a: adding SiO to the concentrated suspension 2 The polyethylene glycol 200 liquid of 10% by weight of the micro-nano balls was treated with an ultrasonic stirring device for 30 minutes. Step b: Use spray drying equipment to control the inlet temperature at 220°C, the outlet temperature at 90°C, the compressed air pressure at 0.3MPa, and the suspension feed flow rate at 1.8L / min, carry out spray drying, and obtain SiO in the receiv...

Embodiment 3

[0037] At first, according to the method for embodiment 1, prepare the SiO that D50 particle size is 278nm 2 Micro-nano balls; use a ceramic microfiltration membrane with a filter pore size of 150nm to clean the SiO obtained by the reaction 2 The aqueous phase suspension of micronanospheres is washed until the pH of the filtrate=7. Then stop adding distilled water, and continue to use ceramic microfiltration membrane to filter out the water in the suspension to concentrate until the solid content of the suspension is 8%.

[0038] Then, step a: adding SiO to the concentrated suspension 2 Glycerol liquid with 15% weight of micro-nanospheres was treated with ultrasonic stirring equipment for 45 minutes. Step b: Spray the suspension treated in step a by using spray drying equipment, controlling the inlet temperature at 240°C, the outlet temperature at 100°C, the compressed air pressure at 0.4MPa, and the suspension feed flow rate at 2.0L / min. Dry to get SiO in the receiver 2 D...

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Abstract

The invention belongs to the technical field of nano-scale microsphere applications, and in particular relates to a preparation method of a shearing thickened fluid based on SiO2 nano-scale microspheres, and an application of the shearing thickened fluid prepared with the preparation method in a rheid protection composite material. According to the preparation method of a shearing thickened fluidbased on SiO2 nano-scale microspheres in the invention, SiO2 nano-scale microsphere agglomeration can be effectively prevented, and particles are evenly dispersed. The preparation method has the advantages of simple technology, short preparation period, strong operation controllability, stable product performance, low energy consumption, few three wastes, low cost and the like, is easy for volumeproduction and is especially suitable for industrial production. When the shearing thickened fluid prepared with the method provided by the invention is applied to the preparation of the rheid protection composite material, the obtained composite material has the advantages of high protective capability and light weight and is soft and tough which can satisfy the requirements of comprehensive, comfortable and light individual protective materials.

Description

technical field [0001] The invention relates to the technical field of micro-nano powder application, in particular to a SiO-based 2 A method for preparing a shear-thickening fluid of micro-nanospheres, and an application of the shear-thickening fluid prepared by the preparation method in soft protective composite materials. Background technique [0002] In recent years, studies have found that monodisperse SiO 2 The fluid prepared by dispersing micro-nanospheres in an organic solvent has the characteristics of shear thickening with a rapid increase in viscosity at the moment of impact. The composite material developed by using this characteristic has many properties such as impact resistance, sharp puncture resistance, shock absorption, energy absorption, etc. function. 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 comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/79D06M101/36
Inventor 万军喜李霞王琨曹海琳
Owner SHENZHEN ACAD OF AEROSPACE TECH
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