Hydrophilicity and hydrophobicity adjustable nano SiO2 powder

A nano and powder technology, applied in the treatment of dyed organosilicon compounds, dyed polymer organic compounds, fibrous fillers, etc., can solve the problems of unsuitable industrial applications, expensive raw materials, and complex synthesis processes.

Active Publication Date: 2013-12-18
YANGZHOU SIXIN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Document 2 "Motoyuki Iijima, Hidehiro Kamiya. Layer-by-Layer Surface Modification of Functional Nanoparticles for Dispersion in Organic Solvents. Langmuir26 (2010) 17943-17948." discloses an anionic surface having both hydrophobic chains and hydrophilic chains Active agent, the silica particles adsorbed with the surfactant can be dispersed in a variety of organic solvents of different polarities, but its synthesis process is relatively complicated and the raw materials are relatively expensive, so it is not suitable for industrial application

Method used

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  • Hydrophilicity and hydrophobicity adjustable nano SiO2 powder
  • Hydrophilicity and hydrophobicity adjustable nano SiO2 powder
  • Hydrophilicity and hydrophobicity adjustable nano SiO2 powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix and stir 16g deionized water, 64g ethanol, and 3.2g ammonia water, add 6.4g tetraethyl orthosilicate when it rises to 30°C, add 3.2g vinyltriethoxysilane after 5 minutes, continue stirring for 20 minutes, and then Centrifugal separation, washing and drying to obtain vinyl SiO 2 particles;

[0032] Take 1g of vinyl SiO 2 , ultrasonically dispersed in 100mL cyclohexanone, added 0.5g hydrogen-containing silicone oil (hydrogen content 1%), 0.3g chloroplatinic acid, refluxed and stirred at 150°C for 6 hours, then added 1g allyl polyether (molecular weight 300), Continue to reflux and stir for 6 hours, centrifuge, wash and dry to obtain modified nano-SiO 2 Powder. The prepared modified nano-SiO 2 The infrared spectrum of the powder is shown in figure 1 As shown, it can be seen from the figure that nano-SiO 2 The surface is grafted with hydrophobic hydrogen-containing silicone oil and hydrophilic allyl polyether at the same time.

[0033] Take 0.2g modified nano-SiO...

Embodiment 2

[0036]Mix and stir 16g deionized water, 64g ethanol, and 4.8g ammonia water, add 6.4g tetraethyl orthosilicate when it rises to 40°C, add 4.8g vinyltriethoxysilane after 5 minutes, continue stirring for 25 minutes, and then Centrifugal separation, washing and drying to obtain vinyl SiO 2 particles;

[0037] Take 1g of vinyl SiO 2 , ultrasonically dispersed in 150mL 1,4-dioxane, added 0.8g hydrogen-containing silicone oil (hydrogen content 1.56%), 0.4g chloroplatinic acid, refluxed and stirred at 100°C for 6 hours, then added 8g allyl polyether ( Molecular weight 300), continue to reflux and stir for 6 hours, centrifuge, wash and dry to obtain modified nano-SiO 2 Powder.

[0038] Take 0.2g modified nano-SiO 2 Powder, 10g ethanol, ultrasound 20min to obtain dispersion, pull the coating on a glass plate, bake at 100°C for 2h, test its contact angle to be 124°, as image 3 .

[0039] Take 0.2g modified nano-SiO 2 Powder, 20g organic solvent (respectively n-hexane, toluene, ...

Embodiment 3

[0041] Mix and stir 16g deionized water, 72g ethanol, and 4.8g ammonia water, add 7.2g tetraethyl orthosilicate when it rises to 50°C, add 4.8g vinyltriethoxysilane after 10 minutes, continue stirring for 25 minutes, and then Centrifugal separation, washing and drying to obtain vinyl SiO 2 particles;

[0042] Take 1g of vinyl SiO 2 , ultrasonically dispersed in 100mL N,N-dimethylformamide, added 1g hydrogen-containing silicone oil (hydrogen content 1.56%), 0.4g Karstedt catalyst, refluxed and stirred at 150°C for 8 hours, then added 1g allyl polyether (molecular weight 500 ), continue to reflux and stir for 6 hours, centrifuge, wash and dry to obtain modified nano-SiO 2 Powder.

[0043] Take 0.2g modified nano-SiO 2 Powder, 10g ethanol, ultrasonic 20min to obtain dispersion liquid, pull coating film on a glass sheet, bake at 100°C for 2h, test its contact angle to be 139°, as Figure 4 .

[0044] Take 0.2g modified nano-SiO 2 Powder, 20g of organic solvents (n-hexane, t...

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Abstract

The invention discloses hydrophilicity and hydrophobicity adjustable nano SiO2 powder. The nano SiO2 powder is prepared by the following method: firstly synthesizing vinyl SiO2 particles with tetraethoxysilane, vinyltriethoxysilane and the like by a one-pot method, then using hydrogen-containing silicone oil and allyl polyether as modifying agents to modify the vinyl SiO2 particles step by step via hydrosilylation in the presence of a catalyst, and achieving hydrophilicity and hydrophobicity adjustability by adjusting the amount of hydrogen-containing silicone oil and allyl polyether. The nano SiO2 powder with moderate hydrophilicity and hydrophobicity can be dispersed in solvents with different polarities and can be also used for preparing Pickering emulsion. The method has the beneficial effects that the raw materials used in the method are accessible and the operating steps are simple, so that the method has extensive application prospects in industry.

Description

technical field [0001] The invention relates to a silicon dioxide powder, especially a nano-silica powder with adjustable hydrophilicity and hydrophobicity, and the nano-SiO powder with moderate hydrophilicity and hydrophobicity in the powder 2 A method for preparing Pickering emulsion from powder. Background technique [0002] Nano-silica powder has superior chemical, mechanical, optical, electrical, magnetic and other properties, and has a very wide range of applications in industry. However, due to its huge specific surface area and specific surface energy, nano-silica is very easy to agglomerate with each other. In addition, the surface of nano-silica is rich in hydroxyl groups, showing strong hydrophilicity. It is not easy to disperse in the matrix, which brings inconvenience to industrial production. [0003] Literature 1 "J.Lin, H.Chen, Y.Yuan et al.Mechanochemically conjugated PMHS / nano-SiO 2 hybrid and subsequent optimum grafting density study. Applied surface sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C08J3/09C09C1/28C09C3/10C09C3/12
Inventor 陈洪龄张渝
Owner YANGZHOU SIXIN NEW MATERIAL TECH CO LTD
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