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Nano titanium dioxide and preparation method thereof

A nano-titanium dioxide and matrix technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve the problems of reducing the strength, compactness and gloss of organic polymer materials, and achieve low surface energy and difficulty in agglomeration Effect

Inactive Publication Date: 2011-04-13
JIANGSU KAOPULE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since nano-titanium dioxide exists in the form of larger agglomerated particles, it even reduces the original properties of organic polymer materials such as strength, compactness and gloss.

Method used

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  • Nano titanium dioxide and preparation method thereof
  • Nano titanium dioxide and preparation method thereof
  • Nano titanium dioxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Add 200 grams of nano-titanium dioxide particles with a particle diameter of 18-20 nm into 1000 grams of isopropanol, and stir for 20 minutes with a stirrer. Then, add 10 grams of glyceryl monolaurate with a hydrophilic-lipophilic balance value of 5.2, and stir at a high speed for 1 hour, so that glyceryl monolaurate is dissolved in isopropanol and evenly coated on the surface of the nano-titanium dioxide particles. Then, dry under reduced pressure at a temperature of 60° C. for 24 hours to obtain nano-titanium dioxide surface-modified with glyceryl monolaurate.

[0055] Wetting height and time (h 2 ~t) the relationship is as image 3 shown. Before modification, wetting height and time (h 2 ~t) The slope k of the relationship line is relatively large, k=0.2437, at this time, the hydrophilicity is strong, and the contact angle between nano-titanium dioxide and water can be set to 5°. After modification with glyceryl monolaurate, the wet height and time (h 2 ~t) The ...

Embodiment 2

[0058] Add 500 grams of nano-titanium dioxide particles with a particle diameter of 50-60 nm into 1000 grams of ethanol, and stir for 30 minutes with a stirrer. Then, add 20 grams of sorbitan tristearate Span 65 with a hydrophilic-lipophilic balance value of 2.1, and stir at high speed for 1.5 hours, so that Span 65 is completely dissolved in ethanol and evenly coated on the surface of nano-titanium dioxide particles superior. Then, dry under reduced pressure at a temperature of 60° C. for 24 hours to obtain Span 65 surface-modified nano-titanium dioxide.

[0059] Wetting height and time (h 2 ~t) the relationship is as Figure 5 shown. Before modification, the slope k=0.342, the nano-titanium dioxide exhibits strong hydrophilicity, and the contact angle between the nano-titanium dioxide and water can be set to 5°. After modified by Span 65, h 2 The slope k of the ~t relationship line becomes very small, k=0.000599, and the contact angle θ increases obviously. Calculated ...

Embodiment 3

[0062] 300 grams of particle diameters are 10-15nm nano-titanium dioxide particles and 18 grams of propylene glycol monostearate with a hydrophilic-lipophilic balance value of 3.4 are added in 1000 grams of methanol, stirred at a high speed for 1.5 hours, so that the monostearic acid The propylene glycol ester is completely dissolved in methanol and uniformly coated on the surface of nano titanium dioxide particles. Then, dry under reduced pressure at a temperature of 60° C. for 24 hours to obtain propylene glycol monostearate surface-modified nano-titanium dioxide.

[0063] The wetting height and time (h 2 ~t) the relationship is as Figure 7 shown. Before modification, h 2 The slope k of the relationship line between ~t is relatively large, and k=0.3089. At this time, the hydrophilicity is strong, and the contact angle between nano-titanium dioxide and water can be set to 5°. After modification with propylene glycol monostearate, h 2 The slope k of the ~t relationship l...

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Abstract

The invention relates to nano titanium dioxide, which contains nano titanium dioxide granules serving as matrix and a nonionic surfactant coated on the surface of the nano titanium dioxide matrix, wherein the granule diameter of the nano titanium dioxide matrix is 1 to 100 nanometers, the hydrophile-lipophile balance value of the nonionic surfactant is 1 to 10, and the content of the nonionic surfactant is 1 to 20 weight percent of the weight of the nano titanium dioxide matrix. The invention also relates to a method for preparing the nano titanium dioxide. The method comprises the following steps of: a) wetting the nano titanium dioxide granules serving as the matrix by using a wetting agent; b) mixing the nonionic surfactant and the dispersoid of the nano titanium dioxide matrix from the step a) in the wetting agent uniformly, wherein the hydrophile-lipophile balance value of the nonionic surfactant is 1 to 10, and the content of the nonionic surfactant is 1 to 20 weight percent of the weight of the nano titanium dioxide matrix; and c) drying, wherein the granule diameter of the nano titanium dioxide matrix is 1 to 100 nanometers. The nano titanium dioxide has the characteristics of lipophilicity, low polarity, low surface energy, difficult agglomeration, uniform dispersion and the like.

Description

technical field [0001] The present invention relates to nano-titanium dioxide, more specifically, to nano-titanium dioxide surface-modified with a nonionic surfactant. The present invention further relates to a preparation method of the nano-titanium dioxide. Background technique [0002] At present, the laboratory preparation technology of nano-titanium dioxide emerges in an endless stream, but the number of nano-titanium dioxide that can achieve nanoscale uniform dispersion and composite in oily organic materials and exhibit significant functionality is very small. The reason is that nano-titanium dioxide itself has the characteristics of strong hydrophilicity, strong polarity, high surface energy, and easy mutual agglomeration. Unmodified nano-titanium dioxide is easy to agglomerate with each other to form large particles, and loses nano-particles in organic composite materials. The size effect hardly exhibits the functionality of nano-titanium dioxide. Since nano-titan...

Claims

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Application Information

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IPC IPC(8): C01G23/047B82Y30/00B82Y40/00
Inventor 徐瑞芬于义龙马卓尔解双英
Owner JIANGSU KAOPULE NEW MATERIALS
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