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Preparation method of high-temperature-resistant and corrosion-resistant fluorine-containing organic silicon/SiO2 nano-hybrided coatings

A silicone and corrosion-resistant technology, applied in coatings, anti-corrosion coatings, etc., can solve the problems affecting the hydrophobicity and corrosion resistance of the coating, the hydrolysis rate is difficult to control, and the substrate is corrosive, so as to achieve the stability of the coating synthesis process , the effect of improving mechanical properties and improving hydrophobic properties

Inactive Publication Date: 2013-05-29
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its preparation method uses hydrochloric acid as a catalyst. Due to the fast catalytic rate, the reaction is not easy to control, and the Cl remaining in the system - can be corrosive to the substrate
In addition, the author chose trifunctional alkoxysilane (trimethoxysilane, triethoxysilane) as the precursor, and the hydrolysis rate was higher than that of difunctional alkoxysilane, which made it difficult to control the hydrolysis rate, and the final product was also in the shape of The main structure, the polar group of the side chain is easy to be wrapped, which affects the hydrophobicity and corrosion resistance of the coating

Method used

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  • Preparation method of high-temperature-resistant and corrosion-resistant fluorine-containing organic silicon/SiO2 nano-hybrided coatings
  • Preparation method of high-temperature-resistant and corrosion-resistant fluorine-containing organic silicon/SiO2 nano-hybrided coatings
  • Preparation method of high-temperature-resistant and corrosion-resistant fluorine-containing organic silicon/SiO2 nano-hybrided coatings

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Experimental program
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Effect test

Embodiment 1

[0030] Dissolve 0.07mol tetraethyl orthosilicate in 0.36mol absolute ethanol at room temperature, add dropwise 0.18mol distilled water and 0.0036mol acetic acid, react for 30min, then add 0.02mol dodecafluoroheptylpropylmethyldimethoxysilane in turn , 0.09mol methylphenyldimethoxysilane, reacted for 1h and then heated up to 50°C, condensed and refluxed for 10h to obtain colorless and transparent fluorine-containing silicone / SiO 2 The hybrid sol was sealed and left to stand after cooling to room temperature. The whole reaction process needs to be stirred.

[0031] After a period of time, the hybrid sol that has been sealed and stood still is coated on the substrate (requires pre-treatment such as sandpaper polishing) by brushing (the substrate is tin plate and LY12 aluminum alloy, of which LY12 aluminum alloy is used for heat resistance test , other tests are tinplate plate), after the solvent evaporates, it is cured at 120°C for 10h to obtain fluorine-containing silicone / SiO ...

Embodiment 2

[0033] Dissolve 0.1mol ethyl orthosilicate in 0.44mol absolute ethanol at room temperature, add 0.22mol distilled water and 0.0066mol acetic acid dropwise, react for 45min, then add 0.04mol dodecafluoroheptylpropylmethyldimethoxysilane in turn , 0.08mol methylphenyldimethoxysilane, reacted for 45 minutes and then heated to 70°C, condensed and refluxed for 6 hours to obtain colorless and transparent fluorine-containing silicone / SiO 2 The hybrid sol was sealed and left to stand after cooling to room temperature. The whole reaction process needs to be stirred.

[0034] After a period of time, the hybrid sol that has been sealed and stood still is coated on the substrate (requires pre-treatment such as sandpaper polishing) by brushing (the substrate is tin plate and LY12 aluminum alloy, of which LY12 aluminum alloy is used for heat resistance test , other tests are tinplate plate), after the solvent evaporates, it is cured at 120°C for 10h to obtain fluorine-containing silicone / S...

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Abstract

The invention discloses a preparation method of high-temperature-resistant and corrosion-resistant fluorine-containing organic silicon / SiO2 nano-hybrided coatings, which comprises the following steps: by taking tetraethoxysilane, methylphenyldimethoxysilane and dodecafluoroheptylpropyl methyl dimethoxysilane as precursors, and preparing a fluorine-containing organic silicon / SiO2 hybrided sol by using a sol-gel method. The mole ratios of reaction components are as follows: the mole ratio of tetraethoxysilane, methylphenyldimethoxysilane and dodecafluoroheptylpropyl methyl dimethoxysilane is (0.001-500):(0.001-500):(0.001-200); and the mole ratio of anhydrous ethanol, distilled water, an acetic acid and total Si is (0.001-500):(0-100):(0.0001-50):(0. 01-1000). A coating obtained through curing the sol subjected to film coating has good high temperature resistance, corrosion resistance, hydrophobic properties and mechanical properties.

Description

technical field [0001] The invention relates to a method for preparing an organosilicon / silicon dioxide hybrid coating, in particular to a high-temperature-resistant, corrosion-resistant fluorine-containing organosilicon / SiO 2 Preparation method of nano-hybrid coating. Background technique [0002] Silicone / SiO 2 Nanocomposite materials are a newly developed class of high-performance organic / inorganic hybrid materials, which are based on SiO 2 As an inorganic component, it is combined with the organic phase (organosilicon) through a strong covalent bond, thereby improving the heat resistance and corrosion resistance of the organosilicon polymer. Current Silicone / SiO 2 Most nano-hybrid composite materials choose organosilicon precursors with different alkyl groups in the side chains. The alkyl groups can be methyl, phenyl, acryloxy, etc., and the corrosion resistance can be obtained by adjusting the ratio of the precursors. and hydrophobic silicone / SiO 2 Hybrid coating. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/08C09D5/08C08G77/24
Inventor 刘光明杨晓东曹祖军田继红于斐
Owner NANCHANG HANGKONG UNIVERSITY
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