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Anticorrosive photo-responsive and self-healing shape-memory polyurethane coating and preparation method thereof

An anti-corrosion coating and self-repairing technology, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., to achieve flexible application, prolong service life, and prevent corrosion

Active Publication Date: 2019-03-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional use of thermal stimulation to drive the recovery of shape memory and internal self-repair has many limitations in operation. Compared with it, infrared light stimulation repair is easier to operate, heats up faster, and can be controlled locally and remotely

Method used

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  • Anticorrosive photo-responsive and self-healing shape-memory polyurethane coating and preparation method thereof
  • Anticorrosive photo-responsive and self-healing shape-memory polyurethane coating and preparation method thereof
  • Anticorrosive photo-responsive and self-healing shape-memory polyurethane coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh 0.025g of graphene oxide (GO) into a flask containing 24.975g of polycaprolactone, 400W ultrasonic dispersion for 60mins, to obtain a uniformly dispersed material. Under the protection of nitrogen, heat and stir in an oil bath at 130°C, add 20 microliters of stannous octoate dropwise, and react for 24 hours to obtain GO-PCL-0.1% grafted polymer.

[0046] Weigh 2.000g of GO-PCL-0.1% grafted polymer, add 20mL of N,N dimethylformamide (DMF) and 0.400g of 4,4`-diphenylmethane diisocyanate (MDI), the mass concentration of 0.240g is 2 % dibutyltin dilaurate (DBTDL) catalyst in DMF, stirred at 80° C. for 5 h under nitrogen protection to obtain a solution.

[0047] The resulting solution was coated on the metal surface and cured at 80°C for 12 hours to obtain a shape memory self-healing coating containing GO-SMP-0.1%.

[0048] see figure 1 , the infrared spectrogram of the shape-memory self-healing polyurethane coating provided in this example, 3327cm can be seen in the...

Embodiment 2

[0055] Preparation of GO-PCL-0.1% catalyst with 0.5% self-healing coating metal.

[0056] 1) Synthesize the polymer grafted GO-PCL-0.1% according to Example 1.

[0057] 2) Weigh 2.000g of GO-PCL-0.1% grafted polymer, add 20mL of N,N dimethylformamide (DMF) and 0.400g of 4,4`-diphenylmethane diisocyanate (MDI), 1.200g mass concentration It is a DMF solution of 2% dibutyltin dilaurate (DBTDL) catalyst, stirred at 80° C. for 5 h under the protection of nitrogen to obtain a solution.

[0058] The resulting solution was coated on the metal surface and cured at 80°C for 12 hours to obtain a shape memory self-healing coating containing GO-SMP-0.5%.

[0059] Polarizing microscope and scanning electron microscope were taken before and after the repair of the polyurethane coating according to Example 1, which proved that the coating can be effectively self-repaired.

Embodiment 3

[0061] Preparation of GO-PCL-0.1% catalyst with 1% self-healing coating metal.

[0062] 1) Synthesize the polymer grafted GO-PCL-0.1% according to Example 1.

[0063] 2) Weigh 2.000gGO-PCL-0.1% grafted polymer, add 20mL N,N dimethylformamide (DMF) and 0.400g4,4'-diphenylmethane diisocyanate (MDI), 2.400g mass concentration It is a DMF solution of 2% dibutyltin dilaurate (DBTDL) catalyst, stirred at 80° C. for 5 h under the protection of nitrogen to obtain a solution.

[0064] The resulting solution was coated on the metal surface and cured at 80°C for 12 hours to obtain a shape memory self-healing coating containing GO-SMP-1%.

[0065] Polarizing microscope and scanning electron microscope were taken before and after the repair of the polyurethane coating according to Example 1, which proved that the coating can be effectively self-repaired.

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Abstract

Disclosed are anticorrosive photo-responsive and self-healing shape-memory polyurethane coating and a preparation method thereof. The preparation method includes: adding a filling material into polycaprolactone, adding stannous octoate, reacting for 24-36 hours at a temperature of 130-140 DEG C, adding a solvent, a crosslinking agent and dibutyltin dilaurate, stirring for 5-10 hours at a temperature of 60-80 DEG C under protection of nitrogen, coating on metal surfaces, and curing. The polycaprolactone is adopted as a substrate, a photothermal conversion material is introduced into a polymer network by an in-situ polymerization method, catalyst and the crosslinking agent are introduced, and the polymer network is formed by a crosslinking action to prepare the shape-memory polyurethane coating capable of healing automatically. Under illumination of infrared lights, an interior of the coating can be heated up to 130-140 DEG C rapidly through photothermal conversion, shape memory restoreis stimulated by high temperature, crack surfaces are enabled to contact, polymer chain segments exercise strenuously to stride damaged areas along with cracking and reconstructing of ammonia ester bonds, and accordingly a self-healing function of the coating is realized.

Description

technical field [0001] The invention relates to the field of metal anti-corrosion coatings, in particular to a light-responsive self-repairing shape-memory polyurethane anti-corrosion coating and a preparation method thereof. Background technique [0002] Metal corrosion is an unavoidable problem. According to relevant data, the direct economic loss caused by metal corrosion is as high as 700 billion US dollars every year in the world. The economic loss caused by metal corrosion in my country accounts for about 3% of the gross national product. Therefore, the anti-corrosion research of metal materials has always been a hot spot that people pay attention to. In recent years, people mainly use organic coatings to coat metal surfaces to isolate water, air and corrosive particles to prevent metal corrosion, but organic coatings are difficult to resist coating damage caused by harsh external environments, and corrosive particles penetrate into the metal through the damaged parts....

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D5/08C08G18/42
CPCC08G18/4277C09D5/08C09D175/06C08K3/042
Inventor 白永康张纪雯陈鑫陈莉田然田雨
Owner XI AN JIAOTONG UNIV
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