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A kind of self-healing microcapsule for metal anticorrosion coating and preparation method thereof

A technology of self-repairing microcapsules and metal anticorrosion, which is applied in the direction of anticorrosion coatings, microcapsule preparations, microsphere preparation, etc., and can solve the problems of limited repair efficiency of capsule core materials, poor matching performance of coating substrates, and no corrosion inhibition effect of steel materials. Achieve the effect of large fracture toughness ratio, high repair efficiency and stable mechanical properties

Active Publication Date: 2020-03-31
SHENYANG RES INST OF CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common restoration agents such as vegetable oil (CN102719184A, CN 102390147A), epoxy resin (CN 104624132 A, CN 106215826A, CN 102604469A, CN 106118367 A), isocyanate derivatives (CN 102702838A), and most of them are single-walled microcapsules. The performance is unstable, and at the same time, additional substances are required to form the capsule wall, resulting in a cumbersome preparation process
Individually disclosed double-wall microcapsules (CN103881465A), the repair efficiency of the capsule core material is limited, it has no corrosion inhibition effect on steel, and the matching performance with the coating matrix is ​​poor, and additional repair catalysts or curing agents need to be added

Method used

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  • A kind of self-healing microcapsule for metal anticorrosion coating and preparation method thereof
  • A kind of self-healing microcapsule for metal anticorrosion coating and preparation method thereof
  • A kind of self-healing microcapsule for metal anticorrosion coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take myo-inositol and remove impurities and dry it in a vacuum drying oven for 1 hour, dry the cyclohexanone solvent with 4A molecular sieve to remove water, and then mix the dried myo-inositol and cyclohexanone at a ratio of 2:1 to obtain a dry mixed solvent for use;

[0048] equipped with N 2 Add 15g of diphenylmethane diisocyanate into the 500mL four-necked round bottom flask of inlet / outlet, dropping funnel, condenser, heating tank and agitator, and pour 6g of the above-mentioned dried mixed solvent into the dropping funnel; Adjust the temperature at 30°C, and add 1 drop of catalyst DBTDL to the flask under stirring, open the dropping funnel, drop the dry mixed solvent in the funnel into the flask within 30 minutes, and then raise the reaction temperature to 60°C , continue the reaction, and keep the reaction for 10h. Until the measured NCO content of the product aromatic isocyanate derivative reaches the calculated theoretical value, the solution is kept refrigera...

Embodiment 2

[0054] Take hexamethylolmelamine and remove impurities and dry it in a vacuum drying oven for 2 hours, use an appropriate amount of ethyl acetate solvent to dry and remove water with 4A molecular sieve; then mix the dried hexamethylolmelamine with ethyl acetate in a ratio of 3:1 to obtain dried Mixed solvent, ready to use;

[0055] equipped with N 2 Add 15g of 2,4-toluene diisocyanate into a 500mL four-necked round-bottomed flask with inlet / outlet, dropping funnel, condenser, heating tank and stirrer, and pour 7g of the above-mentioned dry mixed solvent into the dripping solution Funnel; adjust the temperature at 40°C, and add 1 drop of catalyst DBTDL to the flask under stirring, open the dropping funnel, and drop the mixture of hexamethylolmelamine and ethyl acetate in the funnel into the flask within 30 minutes , and then the reaction temperature was raised to 70° C., and the reaction was continued, and the reaction was kept for 9 hours. Until the measured NCO content of t...

Embodiment 3

[0061] Take polyether polyol and remove impurities and dry it in a vacuum drying oven for 3 hours. The solvent is dried with 4A molecular sieve to remove water; then the dried polyether polyol is mixed with toluene solvent in a ratio of 6:1 to obtain a dry mixed solvent for use;

[0062] equipped with N 2 Add 10g of 1,4'-benzenediisocyanate and 4g of 2,6-toluene diisocyanate into a 500mL four-necked round bottom flask with inlet / outlet, dropping funnel, condenser, heating tank and stirrer, and mix the above Pour 12g of dry mixed solvent into the dropping funnel; adjust the temperature at 50°C, add 1 drop of catalyst DBTDL to the flask under stirring, open the dropping funnel, and drop the dried mixed solvent in the funnel within 30 minutes into the flask, then raise the reaction temperature to 70°C, continue the reaction, and keep the reaction for 9h. Until the measured NCO content of the product aromatic isocyanate derivative reaches the calculated theoretical value, the sol...

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Abstract

The invention relates to the technical field of self-repairing anticorrosive paints and particularly relates to a self-repairing microcapsule used for a metal anticorrosive paint and a preparation method of the self-repairing microcapsule. The self-repairing microcapsule sequentially comprises a capsule core material and double layers of wall materials from inside to outside, a corrosion-inhibiting material is loaded between the double layers of wall materials, a coupling reagent is adhered on an outer wall of the double layers of wall materials, wherein the capsule core material is a reactant of a polyhydroxyl or multiamino compound and isocyanate, an inner wall of the double layers of wall materials is polyurethane, the outer wall of the double layers of wall materials is melamine formaldehyde resin, and the corrosion-inhibiting material is a nanoparticle and a metal corrosion inhibitor. The microcapsule is high in repairing efficiency, stable in mechanical property and simple in process, is matched with a matrix, has extensive applications, and can be widely applied to the fields of metal anti-corrosion and self-repairing materials like the petrochemical engineering, the marine industry and the automobile industry.

Description

technical field [0001] The invention relates to the technical field of self-repairing anticorrosion coatings, in particular to a self-repairing microcapsule for metal anticorrosion coatings and a preparation method thereof. Background technique [0002] Corrosion is the deterioration or destruction of materials caused by the reaction between metal materials and the environment. The use of coatings for corrosion protection is the most effective and economical method. Self-healing coatings, that is, coatings that have self-healing functions after being damaged, or coatings that have self-healing functions under certain conditions. The self-healing function is introduced into the anti-corrosion coating to prepare a coating that can freely combine chemical anti-corrosion and physical passive anti-corrosion. It can repeatedly repair self-damage in the external environment and become a kind of smart coating that can be used stably for a long time. Anti-corrosion coating is the pu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/10C08G18/12C08G18/32C08G18/40C08G18/42C08G18/48C08G18/66C08G18/73C08G18/75C08G18/76C09D5/08B01J13/18
CPCB01J13/18C08G18/10C08G18/12C08G18/3206C08G18/4018C08G18/42C08G18/48C08G18/6674C08G18/6685C08G18/73C08G18/755C08G18/7614C08G18/7671C09D5/08
Inventor 胥维昌孔凡厚张磊李磊杨承玲曹莹张学龙
Owner SHENYANG RES INST OF CHEM IND
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