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Micro-crack self-repairing microcapsule and preparation method thereof

A technology for self-repairing microcapsules and microcracks, which is applied in microcapsule preparation, microsphere preparation, coating and other directions to achieve the effect of reducing tedious work and stable storage.

Active Publication Date: 2012-10-03
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At home and abroad, research on microcapsule embedded intelligent anti-corrosion coatings is relatively extensive. At present, there are still problems whether the liquid flowing out of the damaged microcapsule core can react with the catalyst to solidify, and how to induce the curing of the core repair agent to achieve the purpose of repair.

Method used

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  • Micro-crack self-repairing microcapsule and preparation method thereof
  • Micro-crack self-repairing microcapsule and preparation method thereof
  • Micro-crack self-repairing microcapsule and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] In a 500ml container, dissolve 20g of 2,4-toluene diisocyanate in 60g of cyclohexanone, place the container in an oil bath, and stir magnetically at a speed of 400r / min. Add 18g of 1,4-butanediol to the reaction vessel at a speed of 20 hours. Afterwards, the reaction mixture was distilled at 100° C. for 6 hours to distill off excess cyclohexanone, water, and 2,4-toluene diisocyanate, leaving a light yellow, viscous prepolymer.

[0046] Take another 500ml container, add 5g surfactant to dissolve in water, stir and mix for 5 hours, take 40g prepolymer and dissolve it in chlorobenzene, add urea and formaldehyde mixed solution, slowly raise the temperature to 65°C, stir until the prepolymer Dissolve everything, add capsule core mixture (2,4-toluene diisocyanate 30g, benzyl alcohol 2g, cyclohexane 10g) and mix evenly, and emulsify with a high-speed emulsifier at a speed of 10000r / min for 20 minutes to form an O / W emulsion , add 1g defoamer. After reacting at 65°C for 4 hou...

Embodiment 2

[0050] In a 500ml container, dissolve 30 g of hexamethyl diisocyanate in 50 g of cyclohexanone, place the container in an oil bath, and stir magnetically at a speed of 1200 r / min. After reacting for 0.5 hours, 5 g of ethylene glycol was added to the reaction vessel at a rate of 5 mg / s, and the reaction continued for 40 hours. Afterwards, the reaction mixture was distilled at 100° C. for 5 hours to distill off excess cyclohexanone, water, and hexamethyl diisocyanate, leaving a light yellow, viscous prepolymer.

[0051] Take another 500ml container, add 1g of surfactant to dissolve in water, stir and mix for 3 hours, take 60g of prepolymer and dissolve in chlorobenzene, add urea and formaldehyde mixed solution, slowly raise the temperature to 65°C, stir until the prepolymer Dissolve everything, add capsule core mixture (20g hexamethyl diisocyanate, 5g ethyl phenylacetate, 6g cyclohexane) and mix evenly, and emulsify with a high-speed emulsifier at a speed of 30000r / min for 10 mi...

Embodiment 3

[0055] In a 500ml container, dissolve 30 g of p-toluene isocyanate in 70 g of cyclohexanone, place the container in an oil bath, and stir magnetically at a speed of 800 r / min. After reacting for 1.8 hours, 15 g of ethylenediamine was added to the reaction vessel at a rate of 8 mg / s, and the reaction was continued for 8 hours. Afterwards, the reaction mixture was distilled at 100° C. for 5.5 hours to distill off excess cyclohexanone, water, and p-toluene isocyanate, leaving a light yellow, viscous prepolymer.

[0056] Take another 500ml container, add 3g surfactant to dissolve in water, stir and mix for 4 hours, take 45g prepolymer and dissolve it in chlorobenzene, add urea and formaldehyde mixed solution, slowly raise the temperature to 65°C, stir until the prepolymer Dissolve everything, add capsule core mixture (30g p-toluene isocyanate, 3g ethyl phenylacetate, 8g chlorobenzene) and mix evenly, and emulsify with a high-speed emulsifier at a speed of 2300r / min for 15 minutes ...

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Abstract

The invention discloses a micro-crack self-repairing microcapsule, which comprises a capsule core and a capsule wall, wherein the capsule core comprises the following ingredients in part by weight: 10 to 60 parts of isocyanate derivative, 0.1 to 10 parts of capsule core diluent and 2 to 40 parts of cosolvent; and the capsule wall comprises ingredients with the following mol ratio: urea: formaldehyde solution, prepolymer=1: (1.0-4.0): (2.0-6.0), wherein the prepolymer is formed from the ingredients with the mol ratio: isocyanate derivative: cyclohexanone: chain extender=1: (2.0-5.0): (0.3-3.0). The invention also discloses a micro-crack self-repairing anti-corrosion coating utilizing the capsule. The micro-crack self-repairing microcapsule is free from additionally adding a repairing catalyst or an initiator, can realize completely automatic repairing function, can be widely applied to the protection field of a metal surface coating in a wet environment, and solves the problems that the contact probability between functional filling material flowing into cracks in the intelligent anticorrosion coating and the catalyst or the initiator is small.

Description

technical field [0001] The invention relates to the technical field of intelligent anticorrosion coatings, in particular to microcapsules used for self-repairing of microcracks in humid environments, and a preparation method thereof. Background technique [0002] Smart anti-corrosion coating refers to the coating with intelligent material characteristics covered on the target object in the form of anti-corrosion coating. Coating materials that make controllable changes in characteristics under stimulation, can produce selective effects on the environment or respond to environmental changes, and change one or more of their performance parameters in real time to adapt to the environment. Materials, composite materials or composites of materials. [0003] At present, the preparation and application of intelligent anti-corrosion coatings have become a research hotspot in the field of coatings at home and abroad. With the country's ever-expanding demand for marine development, ...

Claims

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Application Information

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IPC IPC(8): C09D7/12C08G18/76C08G18/32C08G18/54B01J13/14C09D5/08C09D163/00C09D167/08C09D127/12
Inventor 王巍许立坤李相波邢路阔
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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