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Method for preparing lipophilic nano SiO2 powder

A lipophilic, nano-technology, applied in chemical instruments and methods, inorganic pigment treatment, dyed organosilicon compound treatment, etc., can solve the problems that are difficult to solve by recycling dispersed phase, unsuitable for industrial production, and achieve controllable reaction level, easy The effect of industrialized production and simple production equipment

Inactive Publication Date: 2008-07-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] γ-(Methacryloyloxy)propyltrimethoxysilane is a commonly used silane coupling agent used to modify various inorganic powders. However, how to make nano-SiO 2 Improve modification effect and avoid nano-SiO 2 Powder agglomeration, controlling the reaction time of modification, controlling cost, and recycling the dispersed phase have always been difficult to solve, and it is not suitable for industrial production

Method used

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  • Method for preparing lipophilic nano SiO2 powder
  • Method for preparing lipophilic nano SiO2 powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 4g of nano-SiO 2 Put the powder into a beaker, add 100ml deionized water, and stir at the same time; then add 15mlH to the beaker 2 o 2 (30wt%) and 15ml of absolute ethanol solution, ultrasonically disperse for 30min, seal with a Petri dish, and put it in a cool place for 12h. The mixed suspension was added to a three-necked flask, heated to 50° C. using an oil bath, and mechanically stirred at the same time at a stirring speed of 400 rpm. Take 120ml of ethyl acetate solution and add it into the three-necked flask. Use 0.1mol / L ammonia water to adjust the pH value of the reaction environment to 9, then take 0.5ml γ-(methacryloyloxy)propyltrimethoxysilane and add it to the three-necked flask, and react for 8h (with the modified lipophilic powder body completely into the organic phase shall prevail). After the reaction is finished, let stand for 6 hours to separate the water phase and the oil phase, then separate the organic phase with a separatory funnel, heat ...

Embodiment 2

[0031] Weigh 4g of nano-SiO 2 Put the powder into a beaker and add 100ml of deionized water while stirring; then add 15ml of H 2 o 2 (30wt%) and 15ml of absolute ethanol solution, ultrasonically disperse for 30min, seal with a Petri dish, and put it in a cool place for 12h. It was added into a three-necked flask, heated to 55° C. with an oil bath, and mechanically stirred at the same time at a stirring speed of 500 rpm. Take 120ml of ethyl acetate solution and add it into the three-necked flask. Use 0.1mol / L ammonia water to adjust the pH value of the reaction environment to 8, then take 0.5ml γ-(methacryloyloxy)propyltrimethoxysilane and add it to the three-necked flask, and react for 8h (with the modified lipophilic powder body completely into the organic phase shall prevail). After the reaction is finished, let it stand for 6 hours to separate the water phase and the oil phase, then use a separatory funnel to separate the organic phase, heat the organic phase to 80°C fo...

Embodiment 3

[0033] Weigh 4g of nano-SiO 2 Put the powder into a beaker and add 100ml deionized water while stirring; then add 8mlH to the beaker 2 o 2 (30wt%) and 8ml of absolute ethanol solution, ultrasonically disperse for 30min, seal with a petri dish, and put it in a cool place for 12h. The mixed dispersion liquid was put into a three-necked flask, heated to 60° C. using an oil bath, and mechanically stirred at the same time at a stirring speed of 400 rpm. Take 130ml of ethyl acetate solution and add it into the three-necked flask. Use 0.1mol / L ammonia water to adjust the pH value of the reaction environment to 9, then take 0.2ml of γ-(methacryloyloxy)propyltrimethoxysilane and add it to the three-necked flask, and react for 10h (with the modified lipophilic powder body completely into the organic phase shall prevail). After the reaction is finished, let it stand for 6 hours to separate the water phase and the oil phase, then use a separatory funnel to separate the organic phase, ...

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Abstract

The invention relates to a preparation method for a lipophilic nanometer powder SiO2. The procedure of the preparation method comprises: (1) the nanometer powder SiO2 is acted as an initial raw material, an activated surface treatment is applied with a hydrogen peroxide solution; (2) the surface of the nanometer powder SiO2 is modified and processed in an aqueous and oil phase mixed liquid with a Gamma -(methacryloyldoxy) propyltrimethoxysilane modifying agent, a dispersion liquid of the lipophilic nanometer powder SiO2 is produced; (3) the lipophilic nanometer powder SiO2 is made after the processing of liquid separating, distilling, and drying. The lipophilic nanometer powder SiO2 has the advantages of simple process, easy industrial production, and good compatibility of the lipophilic nanometer powder SiO2 with the organic solvent and even dispersion.

Description

technical field [0001] The invention belongs to nano SiO 2 The field of preparation, especially involving a kind of lipophilic nano-SiO 2 Powder preparation method. Background technique [0002] nano-SiO 2 It has optical properties such as ultraviolet light absorption and infrared reflection. A large number of unsaturated residual bonds and hydroxyl groups in different states in its molecular structure can bond with some groups in the coating to improve the thermal and chemical stability of the coating. sex. In addition, nano-SiO 2 When the coating film is dry, it can form a network structure, which has a significant effect on improving the aging resistance, smoothness, strength and anti-corrosion performance of the coating. Although nano-SiO 2 Modified coatings have many excellent properties, but nano-SiO 2 A large number of hydroxyl groups on the surface make it hydrophilic, easy to agglomerate, and poor storage stability. The uniform dispersion of nanoparticles in...

Claims

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Application Information

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IPC IPC(8): C09C3/12C09C3/06C09C1/28
Inventor 李耀刚张祺毕成王宏志
Owner DONGHUA UNIV
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