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Hydrophobic modification method of nano silica particles

A nano-silica, hydrophobic modification technology, applied in the production of silica, silicon oxide, bulk chemicals, etc., can solve problems such as difficult industrial promotion and application, complicated preparation process, environmental pollution, etc., and achieve hydrophobic modification method Simple, good dispersibility, less agglomeration effect

Inactive Publication Date: 2017-05-31
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional method has high cost, low efficiency, complex preparation process, easy to cause pollution to the environment, and needs to process the product. Moreover, only a small amount of single sample can be produced, which is difficult for industrial promotion and application.

Method used

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  • Hydrophobic modification method of nano silica particles
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1a. After the nano-silica product prepared by the stober method is washed with alcohol and water, then freeze-dried to obtain a monodisperse nano-silica powder A;

[0017] 1b. Put the monodisperse nano-silica powder A with a diameter of 800nm ​​into ethanol with a purity of 98% or more. The ratio of monodisperse nano-silica powder A to ethanol with a purity of 98% or more is 1g:25mL, and ultrasonically disperse After 2 minutes, system B was obtained;

[0018] 1c. Put the system B in the reaction kettle, seal it, preset the temperature at 270°C, and the pressure at 21MPa. After the temperature and pressure are stable, keep it for 3 hours, and then slowly release the pressure to atmospheric pressure to obtain hydrophobically modified nano-dioxide silicon particles.

[0019] Such as figure 1 Shown, the contact angle that the nano-silica particle that embodiment 1 obtains is recorded after tabletting is 119 °, and the hydrophobic effect of nano-silica particle is obvious;...

Embodiment 2

[0021] The embodiment of this embodiment is basically the same as that of Example 1, the main difference is that the diameter of monodisperse nano silica powder A is 100nm, and the ratio of monodisperse nano silica powder A to ethanol with a purity of more than 98% is 4g: 25mL, the preset temperature of the reaction kettle is 250°C, and the pressure is 15MPa. After the temperature and pressure are stable, keep it for 5h. The contact angle of the nano-silica particles prepared in Example 2 is 120°.

Embodiment 3

[0023] The embodiment of this embodiment is basically the same as that of Example 1, the main difference is that the diameter of monodisperse nano silica powder A is 500nm, and the ratio of monodisperse nano silica powder A to ethanol with a purity of more than 98% is 3g: 25mL, the preset temperature of the reaction kettle is 300°C, and the pressure is 30MPa. After the temperature and pressure are stable, keep it for 3h. The contact angle of the nano-silica particles prepared in Example 3 is 127°.

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Abstract

The invention provides a hydrophobic modification method of nano silica particles. The method utilizes freeze drying technology to protect the shape and monodispersion of nano silica particles, utilizes supercritical technology to enhance the diffusion capacity of ethanol, increases the reaction activity, acquires hydrophobically modified nano silica particles having higher coating rate with higher efficiency, and does not cause agglomeration of nano silica particles easily. The method has the advantages of low cost, simple process, no pollution, and pure product without impurity.

Description

technical field [0001] The invention belongs to the field of hydrophobic powder preparation, and in particular relates to a method for hydrophobic modification of nano silicon dioxide particles. Background technique [0002] Powders with a particle size between 0.001-0.1 μm are called nanopowders. Nano-powder has the advantages of large specific surface area, low melting point, high activity, and strong absorption of broadband. It can be compounded with conventional materials and widely used in chemical, material and light industries. Nano powders can be used as fillers to fill plastics, rubber, etc., reducing costs and improving product performance. In the microelectronics industry, nanopowders can be used in sensors, photoelectric wave absorbing materials and infrared radiation materials, etc. [0003] However, most nanopowders are hydrophilic, and the compatibility and dispersion of powder particles and organic polymers are poor. Therefore, it is necessary to modify o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18
CPCC01B33/18C01P2004/02C01P2004/03C01P2004/62Y02P20/54
Inventor 罗炫邵婷杨春方瑜杨睿赣蒋晓东
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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