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Self-repairing microcapsule used for metal anticorrosion coating and preparation method thereof

A self-healing microcapsule and metal anti-corrosion technology, applied in anti-corrosion coatings, microcapsule preparations, microsphere preparation and other directions, can solve the problems of reducing the self-repairing efficiency of materials, high price, complicated process, etc., to improve the self-repairing efficiency and good Mechanical properties, the effect of simple preparation process

Inactive Publication Date: 2012-03-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent Nos. CN101659719A, US6518330, and US7108914 disclose self-healing microcapsules. The contact between the core material and the catalyst released when it breaks is random, and the core material cannot be polymerized completely, which reduces the self-healing efficiency of the material and increases the self-healing material. The difficulty of preparation; at the same time, the source of highly active catalysts is narrow, expensive, unstable, and easily deactivated by environmental influences
In addition, the in-situ polymerization method for preparing microcapsules is mostly a two-step method, that is, the wall material monomer first undergoes addition reaction under weakly alkaline conditions, and then undergoes polycondensation reaction under weakly acidic conditions. The process is complicated, time-consuming and energy-consuming. , it is difficult to achieve large-scale production

Method used

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  • Self-repairing microcapsule used for metal anticorrosion coating and preparation method thereof
  • Self-repairing microcapsule used for metal anticorrosion coating and preparation method thereof
  • Self-repairing microcapsule used for metal anticorrosion coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 0.78g of emulsifier OP-10 and 5g of urea in 260 ml of deionized water; adjust the pH of the solution to 2.50 and acidify for 90 min; add 0.05g of defoamer n-octanol; at a speed of 3000 r / min, Add 9.69g of tung oil and emulsify for 15min to form a stable emulsion; add 4.69g of formaldehyde under mechanical stirring at 70°C and react for 4h; wash the reaction product, filter it with suction, and dry it in vacuum to obtain a self-healing microcapsule product. The average particle size of the prepared microcapsules was 26.25 μm, and the core material content was 62.3%.

Embodiment 2

[0025] Dissolve 0.97g of emulsifier sodium dodecylbenzenesulfonate and 5g of urea in 260 ml of deionized water; adjust the pH of the solution to 3.00, acidify for 120 min; add 0.1g of defoamer n-octanol; Under the condition of / min, add 19.38g linseed oil and emulsify for 30min to form a stable emulsion; add 4.69g formaldehyde under mechanical stirring at 70°C and react for 4h; the reaction product is washed, filtered and vacuum-dried to obtain self-healing microcapsules product. The prepared microcapsules had an average particle size of 20.28 μm and a core material content of 78.9%.

Embodiment 3

[0027] Dissolve 1.16g of emulsifier Tween 80 and 5g of urea in 260 ml of deionized water; adjust the pH of the solution to 2.50 and acidify for 120 min; add 0.01g of defoamer n-octanol; at a speed of 7000 r / min, Add a total of 19.38g of soybean oil and sunflower oil with a weight ratio of 1:1, and emulsify for 40min to form a stable emulsion; add 4.69g of formaldehyde under mechanical stirring at 70°C, and react for 4h; the reaction product is washed, suction filtered, and vacuum-dried Finally, the self-healing microcapsule product is obtained. The prepared microcapsules had an average particle size of 20.12 μm and a core material content of 75.2%.

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Abstract

The invention discloses a self-repairing microcapsule used for a metal anticorrosion coating and a preparation method thereof, which belong to the technical field of self-repairing materials. The wall material of the self-repairing microcapsule is urea resin, the core material of the self-repairing microcapsule is natural plant oil, and the self-repairing microcapsule is prepared with a one-step in-situ polymerization method. The natural plant oil has the advantages of wide source and low cost and is easy to obtain. The metal anticorrosion coating is coated on the surface of metal to form an anticorrosion coating. Microcracks appear in the long-term use process, the self-repairing microcapsule embedded in the coating is broken by external force, and released natural plant oil and oxygen in the air can directly generate crosslinking polymerization reaction without catalysts to repair the microcracks to prevent the surface of the metal from being further corroded. The self-repairing microcapsule synthetized by the core material substance has the advantages of good mechanical performance, simple preparation technology and low cost and can be widely applied to the self repairing of metal anticorrosion coatings, such as automobile industry, ship industry and the like.

Description

technical field [0001] The invention relates to the technical field of self-repairing materials, in particular to a self-repairing microcapsule for metal anticorrosion coatings and a preparation method thereof. Background technique [0002] One of the main technologies to control metal corrosion is to cover the metal surface with a layer of organic or inorganic metal anti-corrosion coating to prevent external corrosive media from contacting the metal surface to form corrosion. Due to the influence of physical shock, temperature alternation, aging and other factors during the long-term use of metal anti-corrosion coatings, micro-cracks are easily formed inside the coating, and the cracks gradually extend and expand to expose the metal surface to atmospheric water vapor and oxygen. , aggravate the peeling of the coating and reduce the performance of the coating. In addition to localized corrosion, recoating requires localized surface preparation and thickness reduction, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C09D5/08C09D5/00B01J13/18
Inventor 鄢瑛赵鹏张会平
Owner SOUTH CHINA UNIV OF TECH
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