Functional nano-titanium dioxide grafted with antioxidant molecules on surface and preparation method of functional nano-titanium dioxide

A technology of nano-titanium dioxide and surface grafting, which is applied in the field of functionalized nano-titanium dioxide, which can solve the problems of easy loss, easy migration, and poor extraction resistance, and achieve the effects of not easy to seep out, improve dispersion, and overcome poor extraction resistance

Inactive Publication Date: 2018-05-29
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above analysis, the present invention aims to provide a functionalized nano-titanium dioxide with surface grafted antioxidant molecules and a...

Method used

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  • Functional nano-titanium dioxide grafted with antioxidant molecules on surface and preparation method of functional nano-titanium dioxide
  • Functional nano-titanium dioxide grafted with antioxidant molecules on surface and preparation method of functional nano-titanium dioxide
  • Functional nano-titanium dioxide grafted with antioxidant molecules on surface and preparation method of functional nano-titanium dioxide

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preparation example Construction

[0053] Another specific embodiment of the present invention discloses a method for preparing functionalized nano-titanium dioxide grafted with antioxidant molecules on the surface. First, a layer of silicon dioxide is coated on the surface of nano-titanium dioxide by hydrolysis of orthosilicate , the nano-layer silica coated on the surface of nano-titanium dioxide can greatly inhibit the catalytic effect of nano-titanium dioxide on the polymer matrix; On the titanium dioxide particles; after the aminosilane coupling agent is hydrolyzed, it first condenses with the silicon dioxide coated on the surface of the nano-titanium dioxide to obtain nano-titanium dioxide core-shell particles coated with nano-silica modified by the aminosilane coupling agent, and then Grafting the acid chlorinated antioxidant molecules to another functional amino group of the coupling agent to obtain functionalized nano-titanium dioxide with antioxidant molecules grafted on the surface; the specific steps...

Embodiment 1

[0062] The titanium dioxide nanoparticles in this example are titanium dioxide nanorods prepared by a low-temperature hydrothermal method, with a length of about 70 nm and a diameter of about 8 nm. The surface contains a large number of hydroxyl groups and has strong hydrophilicity.

[0063] Preparation of nano-titanium dioxide coated with silicon dioxide: Coating titanium dioxide by hydrolysis of ethyl orthosilicate, weighing 7.5g of nano-titanium dioxide and 300ml of ethanol into a 1L three-necked flask, adding 15g of it dropwise under stirring at 300r / min Ethyl orthosilicate, then use ammonia water to adjust PH = 10, react at 30°C for 24h; wash the product with absolute ethanol until neutral, filter to obtain a silica-coated nano-titanium dioxide filter cake, and then place the filter cake at 80°C Dry in a blast oven for 24 hours, and grind to obtain nano-titanium dioxide powder coated with silicon dioxide.

[0064] Preparation of γ-aminopropyltrimethoxysilane-grafted silic...

Embodiment 2

[0069] The nano-titanium dioxide particles in this embodiment are spherical nano-titanium dioxide particles prepared by a gas phase method, and the primary particle diameter is about 20 nanometers.

[0070] Preparation of nano-titanium dioxide coated with silicon dioxide: Coating titanium dioxide by hydrolysis of ethyl orthosilicate, weighing 7.5g of nano-titanium dioxide and 300ml of ethanol into a 1L three-necked flask, adding 15g of it dropwise under stirring at 300r / min Ethyl orthosilicate, then adjust the pH to 10 with ammonia water, and react at 30°C for 24h. The product was washed with absolute ethanol until it was neutral, filtered to obtain a silica-coated nano-titanium dioxide filter cake, and then the filter cake was dried in a blast oven at 80°C for 24 hours, and ground to obtain a silica-coated nano-titanium dioxide powder .

[0071] Preparation of γ-aminopropyltrimethoxysilane-grafted silica-coated nano-titanium dioxide: Add 4g of silica-coated nano-titanium dio...

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Abstract

The invention relates to a functional nano titanium dioxide grafted with antioxidant molecules on the surface. The surface of the nano-titanium dioxide is coated with silica; an aminosilane coupling agent reacts with the silica and is grafted with an antioxidant. Meanwhile, the invention also relates to a preparation method of the functional nano-titanium dioxide grafted with the antioxidant molecules on the surface. According to the preparation method disclosed by the invention, the surface of the nano-titanium dioxide is coated with a layer of the silica and then the aminosilane coupling agent is used for bridging, and a hindered phenol antioxidant is chemically grafted onto functional nano-titanium dioxide particles. According to the functional nano-titanium dioxide grafted with the antioxidant on the surface, disclosed by the invention, light weathering property and thermal aging resistance of a polymer can be simultaneously improved; in addition, an additive has the advantages ofno toxicity, low possibility of seeping and high stability.

Description

technical field [0001] The invention relates to the technical field of functionalized nano-titanium dioxide, in particular to a functionalized nano-titanium dioxide grafted with antioxidant molecules on the surface and a preparation method thereof. Background technique [0002] Polymer materials are widely used in various fields, and the demand continues to increase. In order to reduce the cost of using polymer materials and improve performance, the addition of inorganic fillers and organic functional additives is generally essential. For example, in order to improve the stability of polymer materials during processing and use, and prolong the service life of polymer material products, it is necessary to add various anti-aging agents and other additives. [0003] Adding nano-inorganic fillers such as nano-calcium carbonate, titanium dioxide, nano-talc powder, nano-montmorillonite, and nano-silica to polymer materials is an important direction for the development of polymer ...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K9/06C08K9/04C08K3/36C08K3/22C08K5/13C08K7/00C08K7/16
CPCC08K9/10C08K3/22C08K3/36C08K5/13C08K7/00C08K7/16C08K9/04C08K9/06C08K2003/2241C08K2201/003C08K2201/011
Inventor 阳明书李根王峰丁艳芬张世民刘鹏陈娟高冲
Owner INST OF CHEM CHINESE ACAD OF SCI
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