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Surface grafting organic functional molecular nano silicon dioxide, and its preparing method

A technology of nano-silica and surface grafting, which is applied in the treatment of dyed low-molecular organic compounds, etc., can solve the problems of poor extraction resistance, easy migration, and easy loss, etc., and achieve the solution of extraction resistance and improve the overall performance. Effect

Active Publication Date: 2007-06-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] An object of the present invention is to combine inorganic nano-silica particles with organic antioxidant functional additives, provide nano-silica grafted with organic functional molecules on the surface, and prepare functionalized inorganic nano-fillers. This nano-material not only improves Improve the dispersion and comprehensive mechanical properties of silica in the polymer, and at the same time improve the thermal and oxidative aging resistance of the polymer, and more importantly, overcome the poor extraction resistance, easy migration, and easy loss of ordinary organic anti-aging functional additives Shortcomings

Method used

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  • Surface grafting organic functional molecular nano silicon dioxide, and its preparing method
  • Surface grafting organic functional molecular nano silicon dioxide, and its preparing method
  • Surface grafting organic functional molecular nano silicon dioxide, and its preparing method

Examples

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Embodiment 1

[0039] Example 1: The nano-silica used in the present invention is Degussa A-200, which is prepared by a gas phase method, with a primary particle size of 12nm and a specific surface area of ​​200 ± 25m 2 / g. The surface contains hydroxyl groups and unsaturated residual bonds, and has strong hydrophilicity.

[0040] Aminosilane coupling agent chemical grafting treatment of nano-silica: Weigh 3g of nano-silica (A-200) and disperse in about 150ml toluene, stir to form a stable suspension; then add 3.9g N-(β- Aminoethyl)-γ-aminopropyltrimethoxysilane, the mixture was stirred and reacted at 100-110°C for 24 hours, then filtered, and the filtrate was washed three times with toluene and ethanol, and the amount of solvent used for each washing was 150ml. Put the washed nano silicon dioxide into a vacuum oven at 100° C. for 6 hours.

[0041] Antioxidant molecular acyl chloride: Weigh 0.5 g of hindered phenol antioxidant 3,5-di-tert-butyl-4-hydroxyl-phenylacrylic acid, add it to abou...

Embodiment 2

[0044] With embodiment 1, wherein nano-silica surface is processed with aminosilane coupling agent N-(β-aminoethyl)-γ-aminopropyltriethoxysilane, the acyl chloride of antioxidant molecule and antioxidant The same method as in Example 1 was used for the grafting of molecules onto the nano-silica treated with the coupling agent.

Embodiment 3

[0046] With embodiment 1, wherein the surface of nano silicon dioxide is processed with 4.5g aminosilane coupling agent γ-aminopropyltriethoxysilane, the acyl chlorination of antioxidant molecule and the grafting of antioxidant molecule to coupling agent treatment The same method as in Example 1 is adopted on the nano-silica.

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Abstract

This invention belongs to the field of nana silicon dioxide modified by organic functioned molecules, especially related to the nano silicon dioxide modified by hindered phenolic antioxygen and its preparation method. The said method is using amino silane coupling agent as a bridge, and chemically grafting the hindered phenolic antioxygen upon the nano silicon dioxide. The amino silane coupling agent accounts for 3%-12% of the total weight of the said processed silicon dioxide and the hindered phenolic antioxygen for 2%-20% by weight. The nano silicon dioxide modified by the said antioxygen molecules can enhance the dispersibility of the nano silicon dioxide the polymer and the comprehensive dynamic performances of the polymer materials, especially the resistance to ageing caused by heat and oxidization during the machining and using processes.

Description

technical field [0001] The invention belongs to the field of nano silicon dioxide modified by organic functional molecules, in particular to nano silicon dioxide modified by hindered phenol antioxidants and a preparation method thereof. Background technique [0002] In order to reduce the cost of polymer materials in use and improve performance, the addition of inorganic fillers and organic functional additives is generally essential. In particular, it should be pointed out that in order to improve the stability of polymer materials during processing and use, various anti-aging agents and other additives must be added. [0003] Adding nano-inorganic fillers such as nano-calcium carbonate, nano-talc powder, nano-montmorillonite, and nano-silica to polymer materials is an important direction for the development of polymer composite materials. Due to their unique small size effect, surface effect and quantum tunneling effect, adding nanoparticles to polymers can not only impro...

Claims

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Application Information

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IPC IPC(8): C09C3/08C08K9/06
Inventor 阳明书高晓薇张世民
Owner INST OF CHEM CHINESE ACAD OF SCI
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