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Method for preparing nano silicon dioxide by impinging stream

A technology of nano-silicon dioxide and silicon dioxide, which is applied in the fields of silicon dioxide, silicon oxide, nanotechnology, etc., can solve the problems such as the inability to prepare nano-scale silicon dioxide.

Active Publication Date: 2020-10-23
SHANDONG LINK SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem that the precipitation method cannot prepare nano-scale silica, we introduce the impingement flow into the production, maximize the energy dispersion through the action of shear force, continuously shear to form tiny droplets, and the cascade energy finally reaches Preparation Conditions of Nanoscale Silica Particles

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  • Method for preparing nano silicon dioxide by impinging stream
  • Method for preparing nano silicon dioxide by impinging stream
  • Method for preparing nano silicon dioxide by impinging stream

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Add water to silica colloid with a conductivity of 1 us / cm to form a 3% silica emulsion, and stir evenly. Transfer the evenly stirred silica emulsion to the high-pressure jet device with two high-pressure gun heads, control the injection pressure at 1MPa, the distance between the gun tips is 1mm, and the diameter is 2mm. Turn on the gun head switch, and shoot two strands of silica emulsion. Due to the existence of the rifling of the gun head, the jet is ejected in a spiral shape and the impulse is increased. After the two spiral jets collide, energy conversion occurs, and the two liquids radiate outward in the form of turbulent flow to form atomized nano-droplets. At the same time, the liquid carbon dioxide is turned on to purge and atomize the nano-droplets. The temperature of the liquid carbon dioxide is -40°C, and the purge pressure is 1MPa, so that the formed nano-droplets are rapidly solidified, and the solidified nano-silica products are collected and heated under ...

Embodiment 2

[0039] Add water to colloidal silicon dioxide with a conductivity of 5 us / cm to form a 10% silicon dioxide emulsion, and stir evenly. Transfer the uniformly stirred silica emulsion to the high-pressure jet device with two high-pressure gun heads, control the injection pressure to 3MPa, the distance between the gun tips to 2mm, and the caliber to 1mm. Turn on the gun head switch, and shoot two strands of silica emulsion. Due to the existence of the rifling of the gun head, the jet is ejected in a spiral shape and the impulse is increased. After the two spiral jets collide, energy conversion occurs, and the two liquids radiate outward in the form of turbulent flow to form atomized nano-droplets. At the same time, the liquid carbon dioxide is turned on to purge and atomize the nano-droplets. The temperature of the liquid carbon dioxide is -50°C, and the purge pressure is 2MPa, so that the formed nano-droplets are quickly solidified, and the solidified nano-silica products are col...

Embodiment 3

[0041] Add water to silica colloid with a conductivity of 5 us / cm to form a 15% silica emulsion, and stir evenly. Transfer the uniformly stirred silica emulsion to the high-pressure jet device with two high-pressure gun heads, control the injection pressure to 5MPa, the distance between the gun heads to 2mm, and the diameter to 1.5mm. Turn on the gun head switch, and shoot two strands of silica emulsion. Due to the existence of the rifling of the gun head, the jet is ejected in a spiral shape and the impulse is increased. After the two spiral jets collide, energy conversion occurs, and the two liquids radiate outward in the form of turbulent flow to form atomized nano-droplets. At the same time, the liquid carbon dioxide is turned on to purge and atomize the nano-droplets. The temperature of the liquid carbon dioxide is -40°C, and the purge pressure is 3MPa, so that the formed nano-droplets are quickly solidified, and the solidified nano-silica products are collected and heate...

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Abstract

The invention provides a preparation method for preparing nano silicon dioxide by an impinging stream method. The preparation method comprises the following steps of: (1) preparing a silicon dioxide emulsion from silicon dioxide colloid; (2) spraying the silicon dioxide emulsion in a high-pressure jet device, forming a turbulent fluid system after spraying to form nano atomized liquid drops, and meanwhile, starting frozen airflow to blow the nano atomized liquid drops to quickly solidify the formed nano liquid drops; and (3) collecting the cured nano silicon dioxide product, and reducing the pressure to normal pressure and raising the temperature to normal temperature to obtain the final nano silicon dioxide product. The impinging stream method for preparing nano silicon dioxide is low incost and simple to operate, the product quality and yield are greatly improved, the water content in the product can be accurately controlled, and industrial production is facilitated.

Description

technical field [0001] The invention relates to the technical field of nano silicon dioxide preparation, in particular to a preparation method of nano silicon dioxide by impinging flow method. Background technique [0002] Silica plays an irreplaceable role in industrial applications. It is an amorphous powder, due to the high activity of silica, it has excellent reinforcement, stability, thixotropy and thickening properties, and is widely used in rubber, plastics, coatings, medicine, daily chemicals, etc. many industries. At present, high-quality silica is mainly produced by the gas phase method, and its technology is mainly monopolized by foreign production giants such as Degussa, Cabot, and Tokuyama. Due to the complex production process, high cost and harsh conditions of fumed silica, although there are domestic enterprises that can produce fumed silica products, they cannot be mass-produced due to technical and equipment requirements. At the same time, my country's fu...

Claims

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Application Information

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IPC IPC(8): C01B33/18B82Y30/00B82Y40/00
CPCC01B33/18B82Y30/00B82Y40/00C01P2004/04C01P2004/64C01P2006/80
Inventor 殷鹏刚吴晓林刘红亮陈华祥刘彩艳
Owner SHANDONG LINK SCI & TECH CO LTD
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