Microcapsule self-healing anticorrosion coating and preparation method thereof

A technology of anti-corrosion coatings and microcapsules, applied in anti-corrosion coatings, coatings, etc., can solve the problems of poor chemical stability, difficult outflow of microcapsules, and easy volatilization, so as to achieve good environmental protection and economy, and repair speed is cheap and high-quality. The effect of simple preparation method

Active Publication Date: 2021-01-15
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this product has the function of self-healing after coating to form a coating as a coating, it has shortcomings with its preparation method. First, the microcapsules in the product and the built-in core material emulsion are all organic matter. Poor chemical stability leads to short service life; secondly, epoxy resin, the main material constituting the core material emulsion, is oily, and its fluidity and chemical activity are poor. The rate is too low; again, the high price of raw materials keeps the price of the product high; again, the price of the raw materials required in the preparation process is high, volatile, and toxic; finally, the preparation method cannot obtain good stability and recovery. Fast and cheap products

Method used

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  • Microcapsule self-healing anticorrosion coating and preparation method thereof
  • Microcapsule self-healing anticorrosion coating and preparation method thereof
  • Microcapsule self-healing anticorrosion coating and preparation method thereof

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Effect test

Embodiment 1

[0042] The concrete steps of preparation are:

[0043] Step 1, firstly, according to the volume ratio of 1% orthosilicate ethyl cyclohexane solution and 25% corrosion inhibitor in a volume ratio of 8:1, mix the two and adjust their pH value with acid After being 1, place it at 60°C and stir for 4 hours to obtain a reaction liquid; wherein, the corrosion inhibitor is sodium monofluorophosphate aqueous solution, the acid is hydrochloric acid, and the stirring rate is 3000r / min. The reaction solution is then filtered to obtain an organic-inorganic hybrid emulsion.

[0044]Step 2, first according to the ratio of 1:3 volume ratio of the tetraethyl orthosilicate cyclohexane solution in the organic-inorganic hybrid emulsion and the aqueous sodium dodecylbenzenesulfonate solution with a mass fraction of 0.003%, the ten An aqueous solution of sodium dialkylbenzenesulfonate is added to the organic-inorganic hybrid emulsion and stirred at a speed of 3000 r / min to make the hydrophilic-li...

Embodiment 2

[0047] The concrete steps of preparation are:

[0048] Step 1, first mix the 1.75% orthoethyl silicate cyclohexane solution and the 21% corrosion inhibitor at a volume ratio of 9:1, and adjust the pH value with acid After reaching 1.5, place it at 70°C and stir for 3.5 hours to obtain a reaction liquid; wherein, the corrosion inhibitor is sodium monofluorophosphate aqueous solution, the acid is hydrochloric acid, and the stirring rate is 3250r / min. The reaction solution is then filtered to obtain an organic-inorganic hybrid emulsion.

[0049] Step 2, first according to the volume ratio of the tetraethyl orthosilicate cyclohexane solution in the organic-inorganic hybrid emulsion and the aqueous sodium dodecylbenzenesulfonate solution with a mass fraction of 0.0035% of 1:2.8, the ten The aqueous solution of sodium dialkylbenzene sulfonate is added to the organic-inorganic hybrid emulsion and stirred at a speed of 3250 r / min, so that the hydrophilic-lipophilic balance value is 3...

Embodiment 3

[0052] The concrete steps of preparation are:

[0053] Step 1, first mix the 2.5% tetraethyl orthosilicate cyclohexane solution and the 17.5% corrosion inhibitor at a volume ratio of 10:1, and adjust the pH value with acid After being 2, place it at 80° C. and stir for 3 hours to obtain a reaction solution; wherein, the corrosion inhibitor is an aqueous solution of sodium monofluorophosphate, the acid is hydrochloric acid, and the stirring rate is 3500 r / min. The reaction solution is then filtered to obtain an organic-inorganic hybrid emulsion.

[0054] Step 2, first according to the volume ratio of the tetraethyl orthosilicate cyclohexane solution in the organic-inorganic hybrid emulsion and the aqueous solution of sodium dodecylbenzenesulfonate with a mass fraction of 0.004% being 1:2.5, the ten An aqueous solution of sodium dialkylbenzenesulfonate is added to the organic-inorganic hybrid emulsion and stirred at a speed of 3500 r / min, so that the hydrophilic-lipophilic bala...

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Abstract

The invention discloses a microcapsule self-repairing anticorrosive coating and a preparation method thereof. The coating is composed of silicon dioxide microcapsules containing corrosion inhibitor inside in silicon-based emulsion. The method is as follows: firstly, a tetraethyl orthosilicate cyclohexane solution and the corrosion inhibitor are mixed, and the pH value is adjusted by acid, then themixture is stirred and allowed to react, and then the reaction solution is filtered; subsequently, a sodium dodecyl benzene sulfonate aqueous solution is added to the obtained organic-inorganic hybrid emulsion and stirred, the obtained water-in-oil core material emulsion is subjected to solid-liquid separation, washing and drying in turn to obtain silicon dioxide microcapsule encapsulated with corrosion inhibitor, the metal platinum catalyst is added in silicone oil and stirred to obtain silicon-based emulsion, the silicon dioxide microcapsule encapsulated with corrosion inhibitor and the a metal platinum catalyst are mixed and maleic anhydride monododecyl ester is added, the mixture is subjected to stirring and reacting to obtain the target product. It has good stability and fast repairing speed, so it is very easy to be widely used in the field of steel structure and concrete steel structure corrosion protection.

Description

technical field [0001] The invention relates to an anti-corrosion coating and a preparation method thereof, in particular to a microcapsule self-repairing anti-corrosion coating and a preparation method thereof. Background technique [0002] The microcapsule self-healing coating is to encapsulate the repairing agent in microcapsules, and compound the microcapsules and a catalyst or curing agent that can polymerize the repairing agent in a polymer material. When the inside of the polymer coating is damaged to produce microcracks, the microcapsules are broken by the cracks, and the coated repair agent flows out under the action of the siphon and fills the inside of the cracks. Polymerization, so as to repair the crack, so that the performance of the coating can be recovered to a certain extent. [0003] As an important application field of intelligent self-healing materials, microcapsule self-healing coatings are of great significance to the repair and life extension of coati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/04C09D5/08
CPCC09D5/08C09D183/04C08K9/10C08K3/36C08K5/3475C08K5/405
Inventor 刘研研屈琪琦王化
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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