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Surface modified nano silicon oxide

A surface modification and nanotechnology, which is applied in the field of surface-modified nano-silica and its modification, can solve the problems of reducing the molecular weight of polymer products, and achieve the effect of promoting application and broadening theoretical research.

Active Publication Date: 2010-01-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In fact nano-SiO 2 The surface contains a large number of oxygen free radicals and hydroxyl free radicals. If these free radicals have not been treated, the surface-modified nano-SiO 2 When polymerizing with organic monomers, these radicals may act as chain transfer agents, greatly reducing the molecular weight of the polymer product

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0059] 100 parts A-type nano-SiO 2 1500 parts of toluene were added to the container for ultrasonic dispersion for 60 minutes (ultrasonic frequency was controlled at 40KHz) and then added to the reactor, and 10 parts of vinyltriethoxysilane and 5 parts of azobisisobutyronitrile were added to the reactor under stirring. Raise the temperature to boiling, and reflux for 5 hours under high-speed shear at 1000r / min. Cool to 45°C, filter, remove the filtrate, wash with 300 parts of toluene, centrifuge at a speed of 500r / min for 5 minutes, and dry in an infrared oven at a temperature of 50°C. Finally, the modified nano-SiO 2 .

[0060] figure 1 and figure 2 Type A nano-SiO 2 And carry out the nano-SiO of surface modification through the method described in embodiment 1 2 transmission electron microscope pictures. Compare figure 1 and figure 2 It can be found that there are differences in the pictures before and after modification. The results of transmission electron micro...

Embodiment 2

[0064] 100 parts A-type nano-SiO 2 1. Add 500 parts of ethyl acetate into the container and ultrasonically disperse for 30min (ultrasonic frequency is controlled at 60KHz), then add to the reactor, add 2 parts of n-dodecanemercaptan to the reactor under stirring, heat up to boiling, and 300r / min high speed Reflux under shear for 1.5h. Cool to 10°C, filter, remove the filtrate, wash with 300 parts of ethyl acetate, centrifuge at 400r / min for 15 minutes and dry in an infrared oven at a temperature of 45°C. Finally, the modified nano-SiO 2 .

Embodiment 3

[0066] 100 parts B-type nano-SiO 2 , 5000 parts of propanol were added to the container for ultrasonic dispersion for 100min (ultrasonic frequency was controlled at 25KHz) and then added to the reactor, and 25 parts of γ-methacryloxypropyltrimethoxysilane, 15 part of azobisisoheptanonitrile, heated to boiling, and refluxed for 4 hours under high-speed shear at 2000r / min. Cool to 25°C, filter, remove the filtrate, wash with 600 parts of propanol, centrifuge at a speed of 1000r / min for 30 minutes, and dry in an infrared oven at a temperature of 40°C. Finally, the modified nano-SiO 2 .

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Abstract

The invention relates to surface modified nano silicon oxide and a surface modifying method thereof. The surface modified nano silicon oxide is prepared by carrying out surface modification to nano SiO2 with a coupling agent and a radical scavenger in the presence of a solvent. The used radical scavenger is one or more of azobicyano compound, inorganic peroxide compound, organic peroxide compound, stable free radical, thiol, thiol ester, benzoquinone, phenol, aryl amine, dialkyl dithioxanthate and tetra-alkyl dithioxanthicamide compound; and the using amount of the radical scavenger accounts for 0.01 to 50 percent by weight of the nano SiO2. Oxygen radical and hydroxyl radical on the surface of the nano SiO2 are eliminated or reduced by using the radical scavenger so as to improve the prior art.

Description

technical field [0001] The invention relates to the field of surface modification of nanomaterials, in particular to a surface-modified nano-oxide, especially a surface-modified nano-silicon oxide and its modification method, and the product obtained through surface modification It can bring significant effects when applied to polymer materials, coatings, adhesives and other fields. Background technique [0002] nano-SiO 2 Due to the characteristics of quantum size effect, macroscopic quantum tunneling effect and small size effect, it can bring superior stability, reinforcement and excellent optical and mechanical properties to the material, so it is widely used in catalyst carriers, polymer materials, precision materials, etc. Ceramic materials, glass fiber reinforced plastics, adhesives, high-grade fillers, sealants, coatings, optical fibers and many other industries. [0003] Due to nano-SiO 2 The surface free energy is high and easy to agglomerate, and when it is used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/08
Inventor 桂强苏致兴车春霞刘鹏荔栓红郭金山李晶钟启林张志强于奎周雷张元寿李炳泉吴宇方伟何连成
Owner PETROCHINA CO LTD
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