A thermally responsive composite self-healing coating and its preparation method

A self-healing and thermally responsive technology, used in coatings, anti-corrosion coatings, epoxy resin coatings, etc., can solve problems affecting coating stability, low content, and decreased coating shielding performance, achieving good corrosion protection performance, Simple preparation process and the effect of wide application environment

Active Publication Date: 2020-12-15
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this method are: first, the active material is directly mixed with the coating, not only certain components in the coating will have a certain impact on the performance of the active material, but also the active material will affect the stability of the coating resistance, resulting in a decrease in the shielding performance of the coating
Secondly, the content of the repairing agent determines whether the repair is good or bad. The repairing ability is poor when the content is low, and micro-cracks are likely to occur inside the coating if the content is high, thereby reducing the shielding performance.
Non-autonomous repair mainly refers to the repair that must rely on external auxiliary conditions. It often relies on the supply of external energy, relying on external stimuli such as temperature, light, and moisture to trigger a series of chemical and physical reactions to repair materials. However, it may cause side effects, which is not conducive to repair or reduce physical shielding performance

Method used

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  • A thermally responsive composite self-healing coating and its preparation method
  • A thermally responsive composite self-healing coating and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Dissolve 0.5g of polycaprolactone and 0.34g of 8-hydroxyquinoline in 18ml of dichloromethane solution, pour into a beaker filled with 100ml of polyvinyl alcohol, stir for 5min with a homogenizer, and magnetically stir for 2.5h. Put the same mass of the above solution into a plastic test tube, and centrifuge once at 2000 rpm for 5 min; once at 5000 rpm for 5 min. Pour off the test tube liquid. Place the test tube with the microspheres in the refrigerator for 30 minutes, and then vacuum freeze-dry for 24 hours.

[0034] Put 0.2g of microspheres into the mixture of 2.27g of epoxy resin and 0.2g of D230 and stir. After stirring evenly, add 0.78g of n-decylamine and continue stirring until the self-healing coating is obtained evenly. Finally, the paint is evenly coated on the base material by coating method or bar method, and then cured at 47°C for 20 hours to obtain a self-healing composite coating with uniform thickness.

[0035] The coating is tested for self-healing, s...

Embodiment 2

[0037] Dissolve 0.5g of polycaprolactone and 0.3g of tolylbenzotriazole in 20ml of dichloromethane solution, pour into a beaker filled with 100ml of polyvinyl alcohol, stir with a homogenizer for 5min, and magnetically stir for 2.5h. Put the same mass of the above solution into a plastic test tube, and centrifuge once at 2000 rpm for 5 min; once at 5000 rpm for 5 min. Pour off the test tube liquid. Place the test tube with the microspheres in the refrigerator for 30 minutes, and then vacuum freeze-dry for 24 hours.

[0038] Put 0.17g of microspheres into the mixture of 2.27g of epoxy resin and 0.25g of D230 and stir. After stirring evenly, add 0.75g of n-decylamine and continue stirring until the self-healing coating is uniformly obtained. Finally, the paint is uniformly coated on the base material by coating method or bar method, and then cured at 52°C for 24 hours to obtain a self-healing composite coating with uniform thickness.

[0039] The coating is tested for self-hea...

Embodiment 3

[0041] Dissolve 0.5g of polycaprolactone and 0.35g of benzotriazole in 22ml of dichloromethane solution, pour into a beaker filled with 100ml of polyvinyl alcohol, stir with a homogenizer for 5min, and magnetically stir for 2.5h. Put the same mass of the above solution into a plastic test tube, and centrifuge once at 2000 rpm for 5 min; once at 5000 rpm for 5 min. Pour off the test tube liquid. Place the test tube with the microspheres in the refrigerator for 30 minutes, and then vacuum freeze-dry for 24 hours.

[0042] Put 0.34g of microspheres into the mixture of 2.27g of epoxy resin and 0.22g of D230 and stir. After stirring evenly, add 0.7g of n-decylamine and continue stirring until the self-healing coating is uniformly obtained. Finally, the paint is evenly coated on the base material by coating method or bar method, and then cured at 50°C for 30 hours to obtain a self-healing composite coating with uniform thickness.

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Abstract

The invention provides a thermal response compound self-repairing coating and a preparation method thereof and belongs to the field of self-repairing high molecular coating materials. The coating is prepared from epoxy resin, an epoxy curing agent, a microsphere shell material and a corrosion inhibitor, wherein the mass ratio of the microsphere shell material to the corrosion inhibitor is 3 to (1.5 to 2.5); microspheres account for 2 to 30 percent of the mass of the coating. The preparation method comprises the following steps: after mixing the epoxy resin and the corrosion inhibitor microspheres, adding the curing agent and uniformly stirring to obtain a mixed solution; finally, uniformly covering the obtained mixed solution on a base material to obtain the self-repairing compound coating. A preparation technology of the coating is simple and the coating has multi-repairing performance; after defects of the coating are self-repaired, a shielding capability on corrosive media includingmoisture, oxygen gas, Cl<-1> and the like of the coating is recovered.

Description

technical field [0001] The invention relates to the field of polymer coating materials, in particular to a self-healing coating added with microspheres and a preparation method thereof. Background technique [0002] Commonly used organic coatings protect metals from corrosion by physically shielding them. However, it is unavoidable to be damaged (scratches, cracks, external force, natural aging) during use, which reduces its shielding performance, and even causes exposed metal materials to accelerate corrosion and cause engineering accidents. At present, the damaged coating relies more on manual removal and replacement, which is expensive. [0003] The self-repair mechanism of intelligent anti-corrosion coating can be divided into two categories: autonomous repair and non-autonomous repair. Self-healing refers to the self-healing function achieved by the pre-encapsulated or embedded repair agent system in the matrix material without energy supply. If active substances are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D7/65C09D7/63C09D5/08
CPCC08L2205/03C09D5/08C09D163/00C09D7/63C09D7/65C08L67/04C08L29/04C08K5/3437C08K5/3475
Inventor 张达威黄尧邓乐萍张帆李晓刚
Owner UNIV OF SCI & TECH BEIJING
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