Method for modifying nano titanium dioxide sol by utilizing silane coupling agent

A technology of nano-titanium dioxide and silane coupling agent, which is applied in the field of modified inorganic nanoparticles, can solve the problems of difficult control process, high cost, complicated process, etc., and achieve the effect of expanding application range, low cost and simple process

Inactive Publication Date: 2011-04-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of complex process, difficult control process and high cost in the traditional method of organic...

Method used

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  • Method for modifying nano titanium dioxide sol by utilizing silane coupling agent
  • Method for modifying nano titanium dioxide sol by utilizing silane coupling agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add the mixed solution of 1.8g deionized water, 2.36g concentrated hydrochloric acid and 6.91g absolute ethanol dropwise to the mixed solution prepared by 17.02g butyl titanate and 6.91g absolute ethanol, control the dripping within 15min, and then Stir for 0.5h, then slowly add 0.31g of silane coupling agent KH-570, raise the temperature to 80°C and react for 1.5h, then end the reaction to obtain KH-570 modified nano-TiO 2 Sol. The relative grafting ratio and particle size of the prepared silane coupling agent-modified nano-titanium dioxide sol are shown in Table 1.

Embodiment 2

[0025] Add the mixture of 3.6g of deionized water, 1.18g of concentrated hydrochloric acid and 11.52g of absolute ethanol dropwise into the mixture of 17.02g of butyl titanate and 11.52g of absolute ethanol, control the dripping within 15min, and then Stir for 0.5h, then slowly add 1.24g of silane coupling agent KH-570 (A-171), raise the temperature to 80°C and react for 1.5h, then end the reaction to obtain KH-570 modified nano-TiO 2 Sol. The relative grafting ratio and particle size of the prepared silane coupling agent-modified nano-titanium dioxide sol are shown in Table 1.

Embodiment 3

[0027] Add the mixture of 1.8g of water, 2.36g of concentrated hydrochloric acid and 6.91g of absolute ethanol dropwise into the mixture of 17.02g of butyl titanate and 6.91g of absolute ethanol, control the dripping within 15min, and then stir for 0.5 h, then slowly added 2.07g of silane coupling agent KH-570 (A-151), stirred at room temperature for 6h, raised the temperature to 80°C for 1.5h, and ended the reaction to obtain KH-570 modified nano-TiO 2 Sol. The relative grafting ratio and particle size of the prepared silane coupling agent-modified nano-titanium dioxide sol are shown in Table 1.

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Abstract

The invention discloses a method for modifying nano titanium dioxide sol by utilizing a silane coupling agent. The method comprises: mixing 20-70 parts by weight of absolute ethyl alcohol, 10-25 parts by weight of deionized water and 5-25 parts by weight of hydrochloric acid at room temperature; adding the mixture to the mixed liquor of 100 parts by weight of butyl titanate and 20-70 parts by weight of absolute ethyl alcohol at the addition speed controlled at 0.4-0.6g/min; stirring the mixture for 0.5-1.5 hours, then adding 1-20 parts by weight of silane coupling agent, and stirring the mixture for 0-24 hours; and heating the mixture to 70-85 DEG C and stirring the mixture to react for 0.5-2.0 hour, thus preparing the nano titanium dioxide sol modified by the silane coupling agent, wherein the silane coupling agent is gamma-methacryloxy propyl trimethoxy silane, ethenyl trimethoxy silane or ethenyl triethoxy silane. The method has the characteristics of simple process, mild reaction conditions, no pollution, wider application prospect and the like.

Description

technical field [0001] The invention belongs to the field of modified inorganic nanoparticles, in particular to a silane coupling agent modified nano titanium dioxide (TiO 2 ) sol method. technical background [0002] Nanomaterials have attracted people's attention because of their unique properties. Nano titanium dioxide (nano-TiO 2 ) In addition to the small size effect, surface and interface effect, quantum size effect and macroscopic quantum tunneling effect of inorganic nanoparticles, it also has special functions such as unique color effect, photocatalysis and ultraviolet shielding. It is used in the automotive industry, cosmetics, wastewater treatment , air purification and other fields have a very broad application prospects. [0003] nano-TiO 2 The specific surface area is large, the surface energy is high, and it is in a non-thermodynamic stable state. The particles are connected to each other to form a chain, and the chain structure interacts with each other t...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/12
Inventor 叶超贤李红强曾幸荣蔡阿满
Owner SOUTH CHINA UNIV OF TECH
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