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Lauric acid modified nano titanium dioxide as well as preparation method and application thereof

A technology of nano-titanium dioxide and titanium dioxide, applied in chemical instruments and methods, dyeing low-molecular organic compound treatment, inorganic pigment treatment, etc., can solve problems such as strong hydrophilicity, agglomeration, precipitation, etc., and achieve good modification effect

Inactive Publication Date: 2020-08-04
行謇人工智能科技(上海)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nano-titanium dioxide prepared by the prior art has a large specific surface area and strong hydrophilicity, which is unfavorable for application in an environment with high moisture; in addition, because the surface hydrophilicity of the nano-titanium dioxide is very strong, it is difficult to disperse evenly in an organic solvent, thereby Reduce the use effect of nano-titanium dioxide. For example, ordinary nano-titanium dioxide is widely used in coating applications, but it is difficult to dissolve uniformly in coating solvents for a long time, and it is easy to form aggregation, precipitate, agglomerate, etc.

Method used

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  • Lauric acid modified nano titanium dioxide as well as preparation method and application thereof
  • Lauric acid modified nano titanium dioxide as well as preparation method and application thereof
  • Lauric acid modified nano titanium dioxide as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Surface modification of nano-titanium dioxide by hydrothermal method to prepare lauric acid-modified nano-titanium dioxide, the steps are: weigh 3g of titanium dioxide nanowires and 0.015g of sodium hexametaphosphate into a beaker, add an appropriate amount of deionized water, and put the beaker Put it on a magnetic stirrer for beating for 1 hour, then add dropwise sodium hydroxide to adjust the pH value of the slurry to 5, add 0.15g of lauric acid, put the beaker into a constant temperature heating magnetic stirrer, heat it in a constant temperature water bath at 85°C for 1.5 hours, and take it out. The obtained sample was left to age for half an hour, filtered with suction, and the obtained solid was reacted in an oven at 80°C for 24 hours to obtain the final product.

Embodiment 2

[0032] Embodiment 2 lipophilicity experiment

[0033] The modified nano-titanium dioxide sample prepared in Example 1 was ground and dried, and the modification effect was evaluated by measuring the degree of lipophilicity through a lipophilic degree experiment. At the same time, the amount of modifier lauric acid, the modification temperature, and the modified The influence of the curing time and the pH value of the solution on the modification effect.

[0034] Weigh about 1 g of modified titanium dioxide nanowires on an electronic balance, put them into a 50 mL beaker, and add 50 mL of distilled water. Then add methanol drop by drop, when the nano-titanium dioxide floating on the liquid surface is all wetted, record the amount V (mL) of the added methanol, and calculate the degree of lipophilicity by the formula Q=V / (50+V)× 100% results in the degree of lipophilicity of the sample, and the higher the degree of lipophilicity tested, the better the lipophilicity and hydrophob...

Embodiment 3

[0036] Embodiment 3 infrared spectrum experiment

[0037] The titanium dioxide nanowires before and after modification were detected by infrared spectroscopy to judge whether the nano-titanium dioxide was successfully modified by lauric acid. The results were as follows Figure 5 shown. It can be seen that the modified titanium dioxide nanowires are at 2923cm -1 and 2852cm -1 There is a new absorption peak at , which is mainly due to the stretching vibration of the methyl group. This new absorption peak is the non-polar part of the lauric acid on the surface of the modified nano-TiO2; the modified Nano-TiO2 due to The stretching vibration of C=O, at 1624cm -1 An absorption peak was generated at , indicating that the reaction between lauric acid and titanium dioxide nanowires was successful; due to the symmetric and asymmetric stretching vibrations of -COO, the modified nano-titanium dioxide was at 1463cm -1 and 1323cm -1 A new absorption peak was generated at , indicating...

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Abstract

The invention discloses lauric acid modified nano titanium dioxide as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing titanium dioxide nanowires and sodium hexametaphosphate in mass ratio of 1: 0.005, adding a proper amount of deionized water, magnetically stirring and pulping, dropwise adding sodium hydroxide to adjust the pH value to 3-6, adding lauric acid with the mass ratio of the lauric acid to the titanium dioxide nanowire to be 60: 1-4, heating for 0.5-2 hours in a constant-temperature water bath at 65-95 DEG C under magnetic stirring, standing, aging, carrying out suction filtering, and reacting at 80-90 DEG C for 12-36 hours to obtain the lauric acid modified titanium dioxide nanowires with the thermal weight lossratio of 9.90-10.00% at 450 DEG C. The lauric acid and the nano titanium dioxide are combined to form a surface chemical bond, so that the nano titanium dioxide has lipophilicity and hydrophobicity,can be uniformly dissolved in an organic solvent to keep stability for a long time, can be used for a long time in a relatively wet environment, and can be used for waterproof spraying paint.

Description

technical field [0001] The invention belongs to the technical field of material modification, and in particular relates to lauric acid modified nano-titanium dioxide and its preparation method and application. Background technique [0002] Commonly prepared nano-titanium dioxide (TiO 2 ) method can be summarized as physical method and chemical method; among them, the physical vapor deposition method is to use arc, high frequency or plasma and other high stable heat sources to heat the raw material to make it vaporize or form plasma, and then quench it to make it condense Forming nanoparticles, vacuum evaporation is the most common method, the particle size and distribution of nanoparticles can be controlled by changing the gas pressure and heating temperature. The chemical method is to use the steam of volatile metal compounds to generate the desired compound through chemical reaction, and the prepared nano-TiO 2 Fine particle size and high chemical activity, spherical par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06C09C3/08C09C3/04C09D7/62
CPCC09C1/3607C09C1/3615C09C1/363C09C1/3653C09C1/3669C09C1/3692C09C3/006C09C3/04C09C3/043C09C3/06C09C3/08C09D7/62
Inventor 黄凯楠
Owner 行謇人工智能科技(上海)有限责任公司
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