Silica nanoparticles grafted with organic functional molecules and its preparation method and application

A technology of functional molecules and nanoparticles, applied in the treatment of dyed low-molecular-weight organic compounds, fibrous fillers, etc., can solve the problems of complex synthesis process, high energy consumption and cost, and high synthesis temperature, and achieve high reactivity, low cost, The effect of high grafting rate

Active Publication Date: 2021-02-26
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some progress has been made in research on silica nanoparticles grafted with hindered phenol antioxidants, due to the complexity of the synthesis process, acid chlorination or catalysts are required, and the synthesis temperature is high, energy consumption and cost are higher

Method used

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  • Silica nanoparticles grafted with organic functional molecules and its preparation method and application
  • Silica nanoparticles grafted with organic functional molecules and its preparation method and application
  • Silica nanoparticles grafted with organic functional molecules and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 22.4g (0.1mol) N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane and 62.5g (0.3mol) ethyl orthosilicate to 1000ml isopropanol, stir well and add 144ml deionized water, stirred and reacted at room temperature for 6 hours, and centrifuged and dried to obtain aminated silica nanoparticles (ANS).

[0043] Disperse 5.0 g of aminated silica nanoparticles in 200 ml of absolute ethanol, dissolve 10.0 g of 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid (AO) in another 200 ml of absolute ethanol, and then Mix the two and stir evenly, react at room temperature for 12 hours and then filter, wash the filtrate three times with absolute ethanol to remove the ungrafted antioxidant, and dry at 60°C to obtain the bismuth grafted with organic functional molecules. Silicon oxide nanoparticles (ANS-AO), the TEM image of which is shown in figure 1 shown.

[0044] from figure 1 It can be seen from the figure that the silica nanoparticles synthesized by this method present an irregular sh...

Embodiment 2

[0048] Add 35.8g (0.2mol) of γ-aminopropyltrimethoxysilane and 41.7g (0.2mol) of ethyl orthosilicate into 800ml of absolute ethanol, stir well, add 108ml of deionized water, and stir at room temperature for 12 hours , after centrifugal drying, aminated silica nanoparticles were obtained. Disperse 5.0 g of aminated silica nanoparticles in 150 ml of dichloromethane, dissolve 5.0 g of 3,5-di-tert-butyl-4-hydroxybenzoic acid in another 150 ml of dichloromethane, then mix the two and Stir evenly, react at room temperature for 24 hours and then filter, wash the filtrate three times with absolute ethanol to remove ungrafted antioxidants, and dry at 60°C to obtain silica nanoparticles grafted with organic functional molecules , wherein the weight of the grafted hindered phenol molecules accounts for 6.1% of the total weight of the organic functional molecule grafted silica nanoparticles, about 0.26mmol / g.

Embodiment 3

[0050] Add 16.3g (0.1mol) of γ-aminopropylmethyldiethoxysilane and 60.9g (0.4mol) of methyl orthosilicate into 500ml of absolute ethanol, stir well, add 54ml of deionized water, and After stirring and reacting for 20 hours, and centrifuging and drying, aminated silica nanoparticles were obtained. Disperse 5.0 g of aminated silica nanoparticles in 200 ml of ethyl acetate, dissolve 2.0 g of 3,5-di-tert-butyl-4-hydroxybenzoic acid in another 100 ml of ethyl acetate, then mix the two and Stir evenly, filter after reacting at room temperature for 24 hours, wash the filtrate three times with ethanol, remove ungrafted antioxidant, and dry at 60°C to obtain silica nanoparticles grafted with organic functional molecules, wherein The weight of the grafted hindered phenol molecules accounts for 2.3% of the total weight of the organic functional molecule grafted silica nanoparticles, about 0.1 mmol / g.

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Abstract

The invention belongs to the field of silica modified by organic functional molecules, and relates to a silica nanoparticle grafted with organic functional molecules and its preparation method and application, in particular to a hindered phenolic antioxidant grafted with a carboxyl group. Branched silica nanoparticles and methods for their preparation. The silica nanoparticles grafted with organic functional molecules are grafted to the surface of silica nanoparticles by organic functional molecules such as hindered phenolic antioxidants through chemical bonds, which can reduce the organic functional molecules such as hindered phenolic antioxidants. Migrate and volatilize, improve the anti-extraction performance of the antioxidant, thereby improving the long-term anti-aging ability of the antioxidant. After grafting and modifying nanoparticles with organic functional molecules such as hindered phenolic antioxidants, the compatibility and dispersion of nanoparticles in the polymer matrix can be effectively improved, and the comprehensive mechanical properties of polymer materials can be improved.

Description

technical field [0001] The invention belongs to the field of silica modified by organic functional molecules, and relates to a silica nanoparticle grafted with organic functional molecules with carboxyl groups and its preparation method and application, in particular to a hindered phenol with carboxyl groups Antioxidant-grafted silica nanoparticles, preparation method and use thereof. Background technique [0002] Nano-silica has the characteristics of small particle size, large specific surface area, strong adsorption performance, high mechanical strength, good heat resistance, stable chemical properties, absorbing ultraviolet rays, and non-toxic and tasteless, so it has been widely used in the field of polymer composite materials. Applications. For example, adding nano-silica to epoxy resin can shorten its curing time, lower the curing temperature, and improve the toughness, heat resistance and wear resistance of epoxy resin. Adding nano-silica to polypropylene can impro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/28C09C3/08C08L23/06C08K9/06C08K9/04C08K3/36
CPCC01P2004/64C01P2006/22C08K3/36C08K9/04C08K9/06C08K2201/011C08L2207/062C09C1/28C09C3/08C08L23/06
Inventor 阳明书鲁明刘鹏张世民王峰丁艳芬
Owner INST OF CHEM CHINESE ACAD OF SCI
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