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Preparation method of montmorillonite/sol-gel composite coating

A technology of composite coating and montmorillonite, applied in the direction of coating, anti-corrosion coating, etc., can solve many problems such as

Active Publication Date: 2021-09-10
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, there are not many studies on building a strong bond between the filler and the matrix during the preparation of the composite coating

Method used

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  • Preparation method of montmorillonite/sol-gel composite coating
  • Preparation method of montmorillonite/sol-gel composite coating
  • Preparation method of montmorillonite/sol-gel composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Carry out intercalation modification to montmorillonite: CC and CTAB modification method are: add 10g original montmorillonite and 100ml deionized water to prepare slurry, process 6h under 250rpm in the ball mill; Add water to dilute to To a certain extent, treat it in a shearing machine at 5000rpm for 2 hours; put the above mixed solution in a water bath heating and stirring system, add an intercalation agent (CC or CTAB) twice the total amount of montmorillonite cation exchange, and treat it at 80°C 8h. Repeated centrifugal washing to remove excess intercalants and impurity ions, the final washed samples were dispersed in a small amount of absolute ethanol, dried at 60°C, and ground for later use. The obtained modified montmorillonites were respectively denoted as CC-MMT, CTA-MMT.

[0045] (2) Take 8.86g GPTMS, 2.6g TEOS and 23g EtOH, add 1 drop of HAc dropwise, stir magnetically at room temperature for 10min to make it fully mixed, and add 3.6g deionized water d...

Embodiment 2

[0055] (1) Carry out grafting modification to montmorillonite: get 1g of original montmorillonite and disperse in 50ml cyclohexane, dropwise add APTES twice the cation exchange amount of montmorillonite to it while stirring, stir at room temperature After 5 hours, the grafting reaction was fully carried out, and the obtained modified montmorillonite was denoted as AP-MMT.

[0056] (2) Prepare pure sol with step (2) of Example 1.

[0057] (3) Prepare the absolute ethanol dispersion of AP-MMT with step (3) of Example 1.

[0058] (4) Disperse the AP-MMT dispersion liquid into pure silica sol as in step (4) of Example 1, continue stirring for 24 hours, then adjust the temperature to 50° C. to evaporate part of the solvent to increase the viscosity of the system. Subsequently, the magnesium alloy sample was vertically immersed in the coating solution, heated in a water bath at 50°C for 1 hour, and then taken out. After the samples were left at room temperature for 12 hours, they ...

Embodiment 3

[0076] Compared with Example 1, most of them are the same, except that the hydrolysis process in step (2) is specifically: first pre-hydrolyze at room temperature for 20 minutes, and then continue to stir and hydrolyze at 60° C. for 2 hours.

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Abstract

The invention relates to a preparation method of a montmorillonite / sol-gel composite coating, which comprises the steps of: (1) carrying out chemical modification on montmorillonite by using CC, CTAB or APTES to obtain modified montmorillonite; (2) well mixing GPTMS, tetraethoxysilane, deionized water and absolute ethyl alcohol, adding glacial acetic acid as a catalyst, and fully hydrolyzing to obtain organic-inorganic hybrid silica sol; (3) dispersing the modified montmorillonite in absolute ethyl alcohol to obtain dispersion liquid, dropwise adding the dispersion liquid into the organic-inorganic hybrid silica sol, and aging to obtain a montmorillonite / sol-gel composite system; and (4) putting a coating object into the montmorillonite / sol-gel composite system, heating in a water bath, taking out and drying the coating object to obtain the montmorillonite / sol-gel composite coating on the coating object. According to the preparation method, the problem that the compatibility of montmorillonite and an organic-inorganic hybrid silica sol system is poor can be solved, and the prepared composite coating can protect a magnesium alloy substrate for a longer time.

Description

technical field [0001] The invention belongs to the technical field of metal surface anticorrosion coatings, and relates to a preparation method of montmorillonite / sol-gel composite coatings. Background technique [0002] Silica sol-gel coating can form silica sol by hydrolyzing and condensing the silane precursor under certain conditions, and then dehydrate and polymerize on the metal surface by changing the conditions to form a film, which belongs to a kind of hybrid polymer polymerization object coating. Due to the advantages of mild and controllable reaction conditions, uniform components, easy doping, and good bonding with metal substrates during the preparation process, researchers in this field have attracted extensive attention. However, due to the volume shrinkage caused by solvent volatilization during the film formation process, the difference in thermal expansion coefficient between the metal substrate and the coating, etc., the film layer is easy to crack, and ...

Claims

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Application Information

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IPC IPC(8): C09D183/06C09D7/61C09D7/62C09D5/08
CPCC09D183/06C09D7/61C09D7/62C09D5/08C08K9/04C08K9/06C08K3/346C08K3/36
Inventor 张俊喜刘煊煊高燕王启伟杜卓玲
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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