CN115738938A - Microcapsule for magnesium alloy self-repairing anti-corrosion coating, preparation method of microcapsule and self-repairing anti-corrosion coating - Google Patents
Microcapsule for magnesium alloy self-repairing anti-corrosion coating, preparation method of microcapsule and self-repairing anti-corrosion coating Download PDFInfo
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Abstract
The invention relates to a preparation method of a microcapsule for a self-repairing anti-corrosion coating, wherein the wall material of the microcapsule is nano-cellulose modified melamine-urea-formaldehyde resin, and the core material is a mixture of tung oil and a drier. The microcapsule is modified by adopting the nano-cellulose, and cerium isooctanoate is preferably used as a drier and a corrosion inhibitor, so that the thermal stability and the corrosion resistance of the microcapsule are obviously improved. The microcapsule prepared by the invention has the advantages of concentrated and controllable particle size, regular shape, higher sealing property, excellent self-repairing and anti-corrosion performances, and can be applied to the magnesium alloy self-repairing anti-corrosion coating to realize long-term protection of the magnesium alloy.
Description
Technical Field
The invention relates to the technical field of coating self-repairing, in particular to a microcapsule for a magnesium alloy self-repairing anticorrosive coating, a preparation method of the microcapsule and the self-repairing anticorrosive coating.
Background
The magnesium alloy has wide application prospect in the fields of automobiles, war industry, aviation, medicine and the like, but the corrosion resistance of the magnesium alloy is poor, so that the further development of the magnesium alloy is limited. The organic coating can effectively prevent the magnesium alloy from being corroded, but the coating can generate microcracks due to external factors such as collision, scratch, illumination and the like in the service process of the magnesium alloy, if the coating is exposed in the environment and is not repaired in time, the microcracks can gradually spread and expand, the coating even loses efficacy and falls off, and the magnesium alloy matrix is directly exposed in the external environment to be corroded.
The microcracks generated by the general coating are difficult to find in the deep part of the material and difficult to repair from the outside. Therefore, the anti-corrosion coating with the self-repairing capability is developed, and has important practical significance for surface protection and practical application of the magnesium alloy. The self-repairing microcapsules are embedded in the organic coating, and the damage self-repairing of the coating is realized by utilizing the automatic response of the microcapsules to microcracks, so that the method is a research hotspot at present. The magnesium alloy has extremely active chemical properties, and if the coating cannot be repaired in time after microcracks appear, the magnesium alloy can be quickly corroded. Therefore, the magnesium alloy self-repairing corrosion-resistant coating must have a faster self-repairing capability to realize the self-repairing function more effectively.
However, the existing two-component microcapsule has the defects of difficult preparation, difficult complete reaction of a core material repairing agent and the like, and the common single-component core material has the defects of slow reaction speed and the like, so that the practical application of the two-component microcapsule on the surface of the magnesium alloy is limited.
Disclosure of Invention
Aiming at the defects that the preparation of a bi-component microcapsule is difficult, core materials are difficult to completely react, and single drying oil has low anti-reaction speed and poor corrosion effect in the prior art, the invention aims to provide the microcapsule for the magnesium alloy self-repairing anti-corrosion coating, the preparation method thereof and the self-repairing anti-corrosion coating. Cerium isooctanoate is added into the tung oil to be used as a drier and a magnesium alloy corrosion inhibitor, so that the repairing agent tung oil and cerium isooctanoate can play a synergistic role in magnesium alloy corrosion prevention and can greatly improve the protection capability of the repaired magnesium alloy.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
a microcapsule for a magnesium alloy self-repairing anti-corrosion coating comprises an external wall material (shell material) and a core material in the wall material, wherein the wall material is a nano-cellulose modified melamine-urea-formaldehyde resin, and the core material is tung oil (repairing agent) containing a drier.
The weight of the drier in the core material is 0.5-1.5 wt% of the weight of the tung oil, and the drier is cerium isooctanoate.
The microcapsule has particle size of 10-80 microns and average wall thickness of 5-8 microns.
The preparation method of the microcapsule for the magnesium alloy self-repairing anti-corrosion coating comprises the following steps:
(1) Dissolving a certain amount of urea and melamine in a formaldehyde solution, then dropwise adding triethanolamine to adjust the pH value to be alkaline, heating in a constant-temperature water bath to react to form a MUF resin prepolymer solution, and diluting for later use;
(2) Adding a certain amount of nano-Cellulose (CNFs) aqueous solution into the diluted MUF resin prepolymer solution obtained in the step (1), and performing ultrasonic oscillation for 30-50 min to obtain a mixed solution of nano-cellulose and MUF resin prepolymer;
(3) Dissolving a certain amount of tung oil containing a drier and sodium dodecyl benzene sulfonate in deionized water, dropwise adding 2 drops of n-octanol for defoaming, and stirring to form a stable oil-in-water core material emulsion;
(4) And (3) slowly adding the mixed solution obtained in the step (2) into the oil-in-water core material emulsion, slowly adjusting the pH value of the solution to 3-5, heating to 50-60 ℃, stirring for reaction for 2 hours, cooling to room temperature, adjusting the pH =7, ending the reaction, repeatedly washing with deionized water and acetone for multiple times, filtering, and drying to obtain the microcapsule.
In the step (1), the molar ratio of the urea to the melamine to the formaldehyde in the formaldehyde solution is 2-3: 1 to 1.5: (6-12); dropwise adding triethanolamine to adjust the pH value of the solution to be 7-9 alkaline conditions, then magnetically stirring the solution at 60-80 ℃ under the alkaline condition that the pH is = 7-9 to react for 1 hour to form a water-soluble MUF resin prepolymer, adding a proper amount of deionized water into the prepolymer solution to dilute the prepolymer solution, and then cooling the solution to room temperature.
In the step (2), the nano-cellulose accounts for 0.5% of the mass of the wall material of the microcapsule; in the step (4), the mass ratio of the tung oil containing the drier to the wall material of the microcapsule is (1-2): 1.
in the step (3), sodium dodecyl benzene sulfonate aqueous solution with the concentration of 8-12 wt.% is prepared, tung oil containing drier is added, 2 drops of n-octanol are added dropwise for defoaming, and mechanical stirring is carried out at the rotating speed of 600-10000 r/min for 1-2 hours, so that the tung oil is completely emulsified, and the uniformly dispersed oil-in-water core material emulsion is formed.
In the step (4), the mixed solution is added into the oil-in-water core material emulsion, diluted hydrochloric acid with the mass fraction of 10% is adopted to slowly adjust the pH value of the solution to 3-5, the temperature is raised to 50 ℃, the solution is stirred for reaction for 2 hours, then the solution is cooled to the room temperature, the pH value of the solution is adjusted to 7 by using 10wt.% of sodium hydroxide solution, the reaction is ended, and the microcapsule is obtained after repeated washing, suction filtration and drying by using deionized water and acetone for many times.
The prepared microcapsule can be further prepared into a self-repairing corrosion-resistant coating, and the preparation process of the self-repairing corrosion-resistant coating comprises the following steps (A) to (C):
(A) Dispersing a certain amount of self-repairing microcapsules into the epoxy resin coating, and mechanically stirring at the rotating speed of 500-2000 r/min for 30-60min; the dosage of the self-repairing microcapsule is 8-12 wt% of the weight of the coating.
(B) Adding curing agent polyamide into the epoxy resin coating, and mechanically stirring at the rotating speed of 500-2000 r/min for 15-30 min to obtain the microcapsule self-repairing anticorrosive coating material;
(C) And coating the microcapsule self-repairing anticorrosive coating material on a magnesium alloy substrate, and curing to obtain the self-repairing anticorrosive coating.
The invention has the following advantages and beneficial effects:
1. the wall material selected by the microcapsule prepared by the invention is melamine-urea formaldehyde resin modified by nano Cellulose (CNFs), the problem of high free formaldehyde content of the traditional urea formaldehyde resin is solved, the microcapsule prepared by the modified resin has high thermal stability, high strength and good boiling resistance, and the nano cellulose serving as a metal corrosion inhibitor can play a role in inhibiting corrosion.
2. The invention provides a preparation method of self-repairing microcapsules, which synthesizes a repairing agent formed by mixing tung oil and a drier cerium isooctanoate in a certain proportion, wherein the repairing agent is released after the microcapsules are broken, can quickly react under the action of oxygen, is adsorbed on the surface of a material to form a film, and repairs and fills microcracks. Compared with the microcapsule with the core material of single tung oil, the microcapsule with the drier cerium isooctanoate can obviously shorten the self-repairing time of the coating and form better protection to the magnesium alloy.
3. The cerium isooctanoate contained in the microcapsule repairing provided by the invention can be used as a drier and is also a rare earth corrosion inhibitor, cerium ions of the cerium isooctanoate can form a layer of hydroxide and oxide on the surface of the magnesium alloy, and the cerium isooctanoate and tung oil have a synergistic effect, so that the high-efficiency self-repairing of the coating is realized.
4. According to the preparation method of the self-repairing microcapsule provided by the invention, the tung oil is preferably used as a core material, a curing agent is not required, compared with a bi-component self-repairing system, the preparation method is simple, the operation is easy, and the self-repairing microcapsule has a better self-repairing effect, and the tung oil serving as a famous special product in China is easy to obtain, high in cost performance and environment-friendly.
5. The preparation method of the self-repairing microcapsule provided by the invention adopts a two-step method to synthesize the microcapsule, and the diameter of the core material liquid drop is controlled by mechanical stirring in the emulsification process, so that the purpose of controlling the particle size of the microcapsule is achieved. Thereby the particle size is controllable, the process is simple and the cost is low. The prepared microcapsule has the advantages of concentrated particle size distribution, good thermal stability, stable capsule wall thickness, regular shape and higher sealing property, and meets the requirements of self-repairing materials.
Drawings
FIG. 1 is a SEM photograph of example 1;
FIG. 2 is a SEM photograph of example 2;
FIG. 3 is a SEM photograph of example 3;
FIG. 4 is a scanning electron micrograph of comparative example 1.
Detailed Description
The preparation of the self-healing microcapsules of the present invention is further illustrated by the following examples. The embodiments are implemented on the premise of the technical scheme of the invention, and obviously, the described embodiments are part of the embodiments of the invention, but not all the embodiments. And the scope of the invention is not limited thereto.
The experimental procedures in the following examples are conventional unless otherwise specified. The experimental materials used in the following examples were commercially available, unless otherwise specified.
The mass fraction of the formaldehyde solution used in the following examples was 37%.
Example 1:
the preparation method of the self-repairing microcapsule provided by the embodiment specifically includes the following steps:
the method comprises the following steps: mixing urea, melamine and formaldehyde solution (calculated according to formaldehyde) according to the proportion of 3:1:9, stirring at normal temperature until melamine and urea are completely dissolved, then adding triethanolamine dropwise to adjust the pH value of the solution to 8-9, then pouring the solution into a 50ml three-neck flask provided with a thermometer, a stirring device and a condensing device, heating in water bath at 70 ℃, stirring and reacting for 1h under the condition of 400r/min by using a magnetic stirrer to obtain a transparent prepolymer solution, adding 2 times volume of deionized water for dilution, and cooling to room temperature for later use.
Step two: adding 1wt.% of nano-Cellulose (CNFs) aqueous solution into the MUF prepolymer solution, and carrying out ultrasonic oscillation for 30min to obtain a mixed solution of the nano-cellulose and the MUF prepolymer.
Step three: weighing sodium dodecyl benzene sulfonate accounting for 8% of the mass of the tung oil, adding 50ml of deionized water into a three-neck flask, stirring by using a mechanical stirrer, and after an emulsifier is dissolved, mixing the tung oil and the melamine-urea resin according to the mass ratio of 1:1, adding tung oil containing 0.5 percent of cerium isooctanoate, dripping 1-2 drops of n-octanol for defoaming, and emulsifying at high speed for 1 hour under the condition of stirring speed of 600r/min to form stable oil-in-water emulsion.
Step four: and slowly dripping the mixed solution into the core material emulsion, stirring uniformly at room temperature, slowly adding 10% dilute hydrochloric acid into a sample injector to adjust the pH value of the system to 3, heating the mixture in a water bath to 50 ℃, stirring for reacting for 2 hours, cooling, adjusting the pH value to 7.0 by using 10% sodium hydroxide, repeatedly washing the obtained suspension by using deionized water and acetone, carrying out suction filtration, and drying to obtain the self-repairing microcapsule.
In this example, the particle size of the microcapsules is about 60 to 80 μm. The scanning electron microscope photo of the microcapsule shows that the microcapsule has rough surface and deposited melamine-urea formaldehyde resin. Therefore, the proportion of the core material to the wall material is smaller, and the capsule wall is too thick.
Example 2:
the preparation method of the self-repairing microcapsule provided by the embodiment specifically includes the following steps:
the method comprises the following steps: mixing urea, melamine and formaldehyde solution (calculated as formaldehyde) according to the proportion of 2.8:1:9, stirring at normal temperature until melamine and urea are completely dissolved, then adding triethanolamine dropwise to adjust the pH value of the solution to 8-9, then pouring the solution into a 50ml three-neck flask provided with a thermometer, a stirring device and a condensing device, heating in water bath at 70 ℃, stirring and reacting for 1h under the condition of 400r/min by using a magnetic stirrer to obtain a transparent prepolymer solution, adding 2 times volume of deionized water for dilution, and cooling to room temperature for later use.
Step two: adding 1.5% nano Cellulose (CNFs) aqueous solution into MUF prepolymer, and ultrasonically oscillating for 50min to obtain mixed solution of nano cellulose and MUF prepolymer.
Step three: weighing sodium dodecyl benzene sulfonate accounting for 10% of the mass of the tung oil, adding 50ml of deionized water into a three-neck flask, stirring by using a mechanical stirrer, and after an emulsifier is dissolved, adding the sodium dodecyl benzene sulfonate and the deionized water into the three-neck flask according to the mass ratio of the tung oil to the melamine-urea formaldehyde resin of 1.5:1, adding tung oil containing 0.8w.t% cerium isooctanoate, dripping 1-2 drops of n-octanol for defoaming, and emulsifying at high speed for 1h under the condition of stirring speed of 800r/min to form stable oil-in-water emulsion
Step four: slowly and dropwise adding the mixed solution into the core material emulsion, stirring uniformly at room temperature, slowly adding 10% dilute hydrochloric acid by using a sample injector to adjust the pH value of the system to 4, heating the system in a water bath to 50 ℃, reacting at a stirring rate for 2 hours, cooling, adjusting the pH value to 7 by using 10% sodium hydroxide, repeatedly washing the obtained suspension by using deionized water and acetone, carrying out suction filtration, and drying to obtain the self-repairing microcapsule.
In this example, the microcapsule particle size is about 40 to 60 μm, as shown in FIG. 2. The scanning electron microscope photo of the microcapsule shows that the microcapsule has regular shape and smooth surface.
Example 3
The preparation method of the self-repairing microcapsule provided by the embodiment specifically includes the following steps:
the method comprises the following steps: mixing urea, melamine and formaldehyde solution (calculated as formaldehyde) according to the proportion of 3:1.2:9, stirring at normal temperature until melamine and urea are completely dissolved, then adding triethanolamine dropwise to adjust the pH value of the solution to 8-9, then pouring the solution into a 50ml three-neck flask provided with a thermometer, a stirring device and a condensing device, heating in water bath at 70 ℃, stirring and reacting for 1h at 400r/min by using a magnetic stirrer to obtain a transparent prepolymer solution, adding 2 times of volume of deionized water for dilution, and cooling to room temperature for later use.
Step two: adding 1.5% nano Cellulose (CNFs) aqueous solution into MUF prepolymer, and carrying out ultrasonic oscillation for 50min to obtain mixed solution of nano cellulose and MUF prepolymer.
Step three: weighing sodium dodecyl benzene sulfonate accounting for 10% of the mass of the tung oil, adding 50ml of deionized water into a three-neck flask, stirring by using a mechanical stirrer, and after an emulsifier is dissolved, mixing the tung oil and the melamine-urea resin according to the mass ratio of 1.5:1, adding tung oil containing 0.5 percent of cerium isooctanoate, dripping 1-2 drops of n-octanol for defoaming, and emulsifying at high speed for 1.5h under the condition of stirring speed of 1000r/min to form stable oil-in-water emulsion
Step four: and slowly dripping the mixed solution into the core material emulsion, stirring uniformly at room temperature, slowly adding 10% dilute hydrochloric acid into a sample injector to adjust the pH value of the system to 4, heating the mixture in a water bath to 50 ℃, reacting at a stirring speed for 2 hours, cooling, adjusting the pH value to 7 by using 10% sodium hydroxide, repeatedly washing the obtained suspension by using deionized water and acetone, carrying out suction filtration, and drying to obtain the self-repairing microcapsule.
In this example, the particle size of the microcapsules is about 20 to 40 μm, as shown in FIG. 3. The scanning electron microscope photo of the microcapsule shows that the microcapsule has regular shape and smooth surface.
The self-repairing microcapsules under the condition of 800r/min and the self-repairing microcapsules under the condition of 1000r/min are respectively prepared through the embodiment 2 and the embodiment 3, and compared with two groups of embodiments, the particle size of the microcapsules is reduced along with the gradual increase of the stirring speed, so that the particle size of the microcapsules can be controlled through controlling the stirring speed, and the microcapsules with the required particle size are prepared.
Comparative example 1:
the preparation method of the self-repairing microcapsule provided by the invention specifically comprises the following steps:
the method comprises the following steps: mixing urea, melamine and formaldehyde solution (calculated as formaldehyde) according to the proportion of 3:1: adding the solution into a beaker according to the molar ratio of 12, stirring at normal temperature until melamine and urea are completely dissolved, then dripping triethanolamine to adjust the pH value of the solution to be 8-9, then pouring the solution into a 50ml three-neck flask provided with a thermometer, a stirring device and a condensing device, heating in water bath at 70 ℃, stirring and reacting for 1h under the condition of 400r/min by using a magnetic stirrer to obtain a transparent prepolymer solution, adding 2 times of volume of deionized water for dilution, and cooling to room temperature for later use.
Step two: adding 1% nano-cellulose water (CNFs) solution into MUF prepolymer, and performing ultrasonic oscillation for 30min to obtain mixed solution of nano-cellulose and MUF prepolymer.
Step three: weighing sodium dodecyl benzene sulfonate accounting for 12% of the mass of the tung oil, adding 50ml of deionized water into a three-neck flask, stirring by using a mechanical stirrer, and after an emulsifier is dissolved, mixing the tung oil and the melamine-urea resin according to the mass ratio of 1.5:1, adding tung oil containing 0.5 percent of cerium isooctanoate, dripping 1-2 drops of n-octanol for defoaming, and emulsifying at high speed for 1 hour under the condition that the stirring speed is 1000r/min to form stable oil-in-water emulsion
Step four: slowly and dropwise adding the mixed solution into the core material emulsion, stirring uniformly at room temperature, slowly adding 10% dilute hydrochloric acid by using a sample injector to adjust the pH value of the system to 5, heating the system in a water bath to 50 ℃, reacting at a stirring rate for 2 hours, cooling, adjusting the pH value to 7 by using 10% sodium hydroxide, repeatedly washing the obtained suspension by using deionized water and acetone, carrying out suction filtration, and drying to obtain the self-repairing microcapsule.
In this example, the molar ratio of urea, melamine and formaldehyde was 3:1:12, the excessive formaldehyde is used to increase the shrinkage rate of the cured microcapsule, and the scanning electron micrograph (figure 4) of the microcapsule shows that the capsule wall is deformed and even broken, and the capsule core flows out.
Example 4:
the invention also provides a preparation method of the microcapsule self-repairing corrosion-resistant coating, which specifically comprises the following steps:
the method comprises the following steps: the microcapsule prepared in example 2 is added into an epoxy resin coating according to a certain mass ratio, the microcapsule content is 10 wt% of the epoxy resin, and the microcapsule is mechanically stirred for 30min at the rotation speed of 1000r/min for standby.
Step two: and (3) polishing the AZ31B magnesium alloy test piece by using sand paper in a grading manner, removing rust and stains on the surface of the test piece, ultrasonically cleaning the test piece for 30min by using ethanol, drying the test piece by using cold air, and placing the test piece in a drying oven for later use.
Step three: mixing the epoxy resin coating containing the microcapsules and a polyamide curing agent according to the weight ratio of 1.5: adding the mixture into a beaker according to the mass ratio of 1, and mechanically stirring the mixture for 15min at the rotating speed of 1000r/min for later use.
Step four: and uniformly brushing the uniformly stirred coating on the treated test piece by using a brush, and drying the test piece at 50 ℃ for 12 hours to prepare the corresponding self-repairing coating.
Performing an electrochemical impedance experiment on the self-repairing corrosion-resistant coating, specifically comprising:
soaking the scratched self-repairing anti-corrosion coating in 3.5 percent sodium chloride aqueous solution by mass percent, and using an electrochemical workstation at 10 DEG 5 ～10 -2 And measuring impedance modulus values of the coating in a frequency range of Hz when the coating is soaked for 3 days, 10 days, 20 days and 30 days, wherein the voltage amplitude is 10mV.
The electrochemical impedance experiment result shows that the impedance modulus of the coating at 0.01Hz is more than 1.0 multiplied by 10 after the coating is soaked for 30 days 4 Ω·cm 2 Has better corrosion resistance.
Claims (10)
1. A microcapsule for a magnesium alloy self-repairing anti-corrosion coating is characterized in that: the microcapsule comprises an external wall material (shell material) and a core material in the wall material, wherein the wall material is nano-cellulose modified melamine-urea-formaldehyde resin, and the core material is tung oil (repairing agent) containing a drier.
2. The microcapsule for the magnesium alloy self-repairing corrosion-resistant coating layer according to claim 1, wherein: the weight of the drier in the core material is 0.5-1.5 wt% of the weight of the tung oil, and the drier is cerium isooctanoate.
3. The microcapsule for the magnesium alloy self-repairing corrosion-resistant coating according to claim 1, wherein: the microcapsule has a particle size of 10-80 μm and an average wall thickness of 5-8 μm.
4. The preparation method of the microcapsule for the magnesium alloy self-repairing anti-corrosion coating according to claim 1, characterized in that: the method comprises the following steps:
(1) Dissolving a certain amount of urea and melamine in a formaldehyde solution, then dropwise adding triethanolamine to adjust the pH value to be alkaline, heating in a constant-temperature water bath to react to form a MUF resin prepolymer solution, and diluting for later use;
(2) Adding a nano-Cellulose (CNFs) water solution with a certain concentration into the diluted MUF resin prepolymer solution obtained in the step (1), and carrying out ultrasonic oscillation for 30-50 min to obtain a mixed solution of nano-cellulose and MUF resin prepolymer;
(3) Dissolving a certain amount of tung oil containing a drier and sodium dodecyl benzene sulfonate in deionized water, dropwise adding 2 drops of n-octanol for defoaming, and stirring to form a stable oil-in-water core material emulsion;
(4) And (3) slowly adding the mixed solution obtained in the step (2) into the oil-in-water core material emulsion, slowly adjusting the pH value of the solution to 3-5, heating to 50-60 ℃, stirring for reaction for 2 hours, cooling to room temperature, adjusting the pH =7, ending the reaction, repeatedly washing with deionized water and acetone for multiple times, filtering, and drying to obtain the microcapsule.
5. The preparation method of the microcapsule for the magnesium alloy self-repairing anticorrosion coating according to claim 1, characterized in that: in the step (1), the molar ratio of the urea to the formaldehyde in the melamine and formaldehyde solution is 2-3: 1 to 1.5: (6-12); dropwise adding triethanolamine to adjust the pH value of the solution to be 7-9 alkaline conditions, then magnetically stirring the solution at 60-80 ℃ and under the alkaline condition of pH = 7-9 to react for 1-2 hours to form water-soluble MUF resin prepolymer, adding a proper amount of deionized water into the prepolymer solution to dilute the prepolymer solution, and then cooling the solution to room temperature.
6. The preparation method of the microcapsule for the magnesium alloy self-repairing anti-corrosion coating according to claim 1, characterized in that: in the step (2), the nano-cellulose accounts for 0.5% of the mass of the wall material of the microcapsule; in the step (4), the mass ratio of the tung oil containing the drier to the microcapsule wall material is (1-2): 1.
7. the preparation method of the microcapsule for the magnesium alloy self-repairing anti-corrosion coating according to claim 1, characterized by comprising the following steps: in the step (3), sodium dodecyl benzene sulfonate aqueous solution with the concentration of 8-12 wt.% is prepared, then tung oil containing drier is added, finally 2 drops of n-octanol are dropped for defoaming, and mechanical stirring is carried out for 1h at the rotating speed of 600-10000 r/min, so that the tung oil is completely emulsified, and the uniformly dispersed oil-in-water core material emulsion is formed.
8. The preparation method of the microcapsule for the magnesium alloy self-repairing anticorrosion coating as claimed in claim 1, wherein the microcapsule comprises the following steps: in the step (4), adding the mixed solution into the oil-in-water core material emulsion, slowly adjusting the pH value of the solution to 3-5 by using 10% by mass of dilute hydrochloric acid, heating to 50 ℃, stirring for reacting for 2 hours, cooling to room temperature, adjusting the pH value to 7 by using 10wt.% of sodium hydroxide solution, finishing the reaction, repeatedly washing with deionized water and acetone for multiple times, filtering, and drying to obtain the microcapsule.
9. A self-healing corrosion protection coating prepared from microcapsules prepared by the process of claim 1, wherein: the preparation process of the self-repairing anti-corrosion coating comprises the following steps (A) to (C):
(A) Dispersing a certain amount of self-repairing microcapsules into the epoxy resin coating, and mechanically stirring at the rotating speed of 500-2000 r/min for 30-60min;
(B) Adding curing agent polyamide into the epoxy resin coating, and mechanically stirring and stirring at the rotating speed of 500-2000 r/min for 15-30 min to obtain the microcapsule self-repairing anticorrosive coating material;
(C) And spraying or brushing the microcapsule self-repairing anticorrosive coating material on a magnesium alloy substrate, and curing to obtain the self-repairing anticorrosive coating.
10. The self-healing corrosion protection coating of claim 9, wherein: in the step (A), the dosage of the self-repairing microcapsule is 8-20 wt% of the weight of the coating.
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| CN202211554272.7A CN115738938A (en) | 2022-12-06 | 2022-12-06 | Microcapsule for magnesium alloy self-repairing anti-corrosion coating, preparation method of microcapsule and self-repairing anti-corrosion coating |
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| CN202211554272.7A CN115738938A (en) | 2022-12-06 | 2022-12-06 | Microcapsule for magnesium alloy self-repairing anti-corrosion coating, preparation method of microcapsule and self-repairing anti-corrosion coating |
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| CN116554721A (en) * | 2023-05-12 | 2023-08-08 | 南京林业大学 | Wood material surface water-based paint anti-corrosion self-repairing compatible microcapsule and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116554721A (en) * | 2023-05-12 | 2023-08-08 | 南京林业大学 | Wood material surface water-based paint anti-corrosion self-repairing compatible microcapsule and preparation method thereof |
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