Nano-silica surface-grafted with antioxidant molecule and preparation method and application thereof

A nano-silica, surface grafting technology, applied in the treatment of dyed low molecular organic compounds, fibrous fillers, etc., can solve the problems of poor extraction resistance, easy loss, easy migration, etc. The effect of improving the anti-photooxidative aging performance

Active Publication Date: 2011-10-05
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to combine inorganic nano-silica particles with hindered phenolic antioxidants with excellent oxidation resistance to provide nano-silica grafted with organic functional antioxidant molecules on the surface to prepare functionalized inorganic Nano-filler, the use of this inorganic nano-filler can not only improve its dispersion and comprehensive mechanical properties in the polymer, but also improve the thermal oxygen and photo-oxidative aging resistance of the polymer, and more importantly, overcome the ordinary organic anti-aging function Auxiliaries have the disadvantages of poor extraction resistance, easy migration, and easy loss

Method used

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  • Nano-silica surface-grafted with antioxidant molecule and preparation method and application thereof
  • Nano-silica surface-grafted with antioxidant molecule and preparation method and application thereof
  • Nano-silica surface-grafted with antioxidant molecule and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The nano-silica used is Degussa A-200, prepared by gas phase method, the primary particle size is 12nm, and the specific surface area is 200±25m 2 / g (eg figure 1 a). The surface contains hydroxyl groups and unsaturated residual bonds, and has strong hydrophilicity.

[0037] Antioxidant-modified nano-silica: Weigh 30 g of antioxidant methyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, stir and melt at a temperature of 65°C to 75°C, Then add the above-mentioned 1g of nano-silica and 0.045g of sodium methoxide, stir to form a nano-silica dispersion suspension; under the protection of nitrogen, the suspension is stirred and reacted at 110°C for 3 hours, then filtered, and the filter cake obtained after filtration Wash three times with ethanol and methanol respectively, and the amount of solvent used for each washing is 200ml. Put the washed modified nano silicon dioxide into a vacuum oven, and dry it at 105° C. for 6 hours. The nano silicon dioxide with antioxida...

Embodiment 2

[0040] Weigh 30 g of antioxidant 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate methyl ester, stir and melt at a temperature of 65 ° C to 75 ° C, and then add 1 g of nanometer di Silicon oxide and 0.055g of sodium methoxide are stirred to form a nano-silica dispersion suspension; the suspension is stirred and reacted at 110°C for 3 hours under the protection of nitrogen, and then filtered, and the filter cake obtained after filtration is washed with ethanol and acetone respectively For three times, the amount of solvent used for each washing is 200ml. Put the washed modified nano silicon dioxide into a vacuum oven, and dry it at 100° C. for 7 hours. The nano silicon dioxide with antioxidant molecules grafted on the surface is obtained. from figure 2 According to the thermogravimetric curve of c, the amount of grafted antioxidant on the surface of nano-silica accounts for 3.2% of the weight of nano-silica grafted with antioxidant molecules on the surface.

Embodiment 3

[0042] Weigh 30 g of antioxidant 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate methyl ester, stir and melt at a temperature of 65 ° C to 75 ° C, and then add 1 g of nanometer di Silicon oxide and 0.065g of sodium methoxide were stirred to form a nano-silica dispersion suspension; the suspension was stirred and reacted at 110°C for 3 hours under the protection of nitrogen, and then filtered, and the filter cake obtained after filtration was washed with ethanol and N, N -Dimethylformamide was washed three times each, and the amount of solvent used for each washing was 200ml. Put the washed modified nano silicon dioxide into a vacuum oven, and dry it for 5 hours at a temperature of 110°C. The nano silicon dioxide with antioxidant molecules grafted on the surface is obtained. from figure 2 The thermogravimetric curve of d shows that the grafting amount of antioxidant on the surface of nano-silica accounts for 4.8% of the weight of nano-silica grafted with antioxidant molecul...

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Abstract

The invention relates to nano-silica which is surface-grafted with hindered phenolic antioxidant molecules and a preparation method and applications thereof. The nano-silica which is surface-grafted with hindered phenolic antioxidant molecules of the invention is prepared by chemically grafting hindered phenolic antioxidant molecules onto nano-silica through a transesterification method under theaction of a catalyst and in the absence of a solvent during the preparation process, and the grafting amount of the antioxidant molecules is 2%-10% of the weight of the nano-silica surface-grafted with the antioxidant molecules. The material of the invention can be used as a filling material for preparing polymer composite materials such as polyolefin, polyester and the like so as to prepare nanocomposite materials of polyolefin or polyester and nano-silica grafted with antioxidants. The nano-silica surface-grafted with the antioxidant molecules of the invention can improve the dispersibilityof nano-silica in the polymer, improve the comprehensive mechanical properties of the polymer material, and especially improve the photooxidation aging resistance of the polymer during processing andusing.

Description

technical field [0001] The invention belongs to the field of nano-silica modified by organic functional molecules and nano-composite materials thereof, and in particular relates to nano-silica nano-silica with hindered phenolic antioxidant molecules on the surface and its preparation method and application. Background technique [0002] As a material for outdoor use, polymer materials will undergo photo-oxidative aging when exposed to ultraviolet light, resulting in structural damage, performance degradation, and even loss of function. In order to reduce the cost of polymer materials in use and prevent the occurrence of photo-oxidative aging of polymer materials so as to protect the polymer materials and have a longer service life, it is generally necessary to add inorganic fillers and organic functional additives to the polymer materials. Among them, what needs to be pointed out in particular is that various antioxidants and other additives must be added. [0003] Nano-ino...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/08C08L23/00C08L67/00C08K9/04C08K3/36
Inventor 阳明书陈景张世民
Owner INST OF CHEM CHINESE ACAD OF SCI
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