CN115746695B - High-adhesion anticorrosive polyamide powder coating and preparation method thereof - Google Patents
High-adhesion anticorrosive polyamide powder coating and preparation method thereof Download PDFInfo
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- CN115746695B CN115746695B CN202211322762.4A CN202211322762A CN115746695B CN 115746695 B CN115746695 B CN 115746695B CN 202211322762 A CN202211322762 A CN 202211322762A CN 115746695 B CN115746695 B CN 115746695B
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Abstract
The invention provides a high-adhesion anticorrosive polyamide powder coating and a preparation method thereof, wherein the polyamide powder coating is (BNSs-OH) -PA/polyamide composite coating, and phytic acid PA is loaded on hydroxyl-functionalized hexagonal boron nitride nanosheets BNSs-OH, so that the dispersibility of the polyamide powder coating is greatly improved through esterification reaction with polyamide end groups, and the polyamide powder coating with high adhesion and high barrier property is obtained; the phytic acid can give the powder coating higher adhesive force, can serve as a corrosion inhibitor to improve the slow release efficiency, and the hexagonal network structure of the hexagonal boron nitride provides good barrier property for gas and liquid; the polyamide nylon powder coating has high adhesive force and excellent corrosion resistance under the multiple synergistic corrosion resistance of the polyamide nylon powder coating and the metal pipeline, the ship and other fields, overcomes the application limitation of the existing material in a high-humidity environment, and improves the stability of the polyamide powder coating.
Description
Technical Field
The invention belongs to the field of powder coatings, and particularly relates to an anti-corrosion polyamide powder coating with high adhesive force and a preparation method thereof.
Background
The powder coating is a novel environment-friendly material, does not contain any organic solvent at all, is directly coated in a form of fine powder, and has obviously improved mechanical properties, durability and the like compared with solvent type coating; at the same time, the solid system of the powder coating enables high recycling rates.
Currently, powder coatings can be classified into thermoset and thermoplastic based on processing and film-forming characteristics. The thermosetting powder coating consists of thermosetting resin, a curing agent, pigment, an auxiliary agent and the like, and is prepared by premixing, then carrying out melt extrusion to obtain granules, and then crushing and screening to obtain the powder coating; the molding resin adopted by the powder coating is prepolymer with low molecular weight, and is crosslinked to form a body type structure after reacting with a curing agent under the heating condition, and the coating film has better mechanical property and corrosion resistance; thermosetting powder coatings are mainly divided into three categories: acrylate powder coating, epoxy powder coating, polyester powder coating. The thermoplastic powder coating consists of thermoplastic resin, pigment, auxiliary agent and the like, and is prepared by premixing or melt mixing to obtain granules, and then crushing and screening to obtain the powder coating; the powder coating has simple processing technology, does not need complex curing procedures, and can form a film by heating, melting, leveling, cooling and solidifying; thermoplastic powder coatings are of a wide variety, such as polypropylene, polyvinyl chloride, polyamide, thermoplastic polyester, chlorinated polyether, fluororesin powder, and the like; the polyamide powder coating, namely the nylon powder coating, does not need primer, has the advantages of good mechanical property, wear resistance, good weather resistance and the like, and is suitable for the pipeline industry, the ship body protection, the road traffic sign, the building industry and the like.
Patent CN103756556a discloses a preparation method of nylon powder coating, which can obtain a flat and smooth coating with no shrinkage cavity, no pinholes and strong adhesive strength, but the polyamide powder coating is easily affected by environmental factors in the use process because the molecular structure of the polyamide powder coating contains hydrophilic amide groups, so that the application of the polyamide powder coating in a high-humidity environment is limited, and the problem is not solved yet. The invention provides an anti-corrosion polyamide powder coating with high adhesive force, which can improve the anti-corrosion performance of polyamide powder in a high-humidity environment while improving the adhesive force of the coating.
Disclosure of Invention
The invention aims to provide an anti-corrosion polyamide powder coating with high adhesive force and a preparation method thereof, which realize uniform dispersion of molecular level, improve the adhesive force of a coating and improve the anti-corrosion performance of polyamide powder in a high-humidity environment.
In one aspect, the present invention provides a method for preparing a high adhesion corrosion resistant polyamide powder coating, the method comprising the steps of:
(1) Preparation of (BNSs-OH) -PA
SS1: dispersing the hydroxyl functionalized hexagonal boron nitride nanosheets IV in an organic solvent V, and carrying out ultrasonic treatment;
SS2: and adding Phytic Acid (PA) into the solution of SS1, continuously dispersing by ultrasonic until the reaction is finished, and obtaining (BNSs-OH) -PA (VI) after centrifugation, washing by deionized water and vacuum drying.
(2) Preparation of powder coating
SSS1: placing polyamide powder with carboxyl at the end group in an organic solvent V, fully dispersing, adding an SS2 product VI, continuously performing ultrasonic dispersion, and stirring to obtain slurry VII after the reaction is finished;
SSS2: and (3) centrifuging the slurry VII, washing the slurry VII with deionized water for a plurality of times, drying the slurry in vacuum, and adding an auxiliary agent for mixing to obtain the high-adhesion anticorrosive polyamide powder coating.
In the invention, the hydroxyl functional hexagonal boron nitride nano-sheet is a functional hexagonal boron nitride nano-sheet with the surface containing hydroxyl, and the preparation steps of the hydroxyl functional hexagonal boron nitride nano-sheet are as follows:
s1: dispersing hexagonal boron nitride (h-BN) in an organic solvent I, carrying out ultrasonic treatment, centrifuging to obtain an upper layer composition, and filtering, washing and vacuum drying to obtain BNSS nanosheets II;
s2: dispersing BNSs nanosheets II in the solution III, transferring to a hydrothermal kettle for reaction, cooling to room temperature after the reaction is finished, centrifuging, separating, washing with deionized water to neutrality, and drying to obtain hydroxyl functionalized hexagonal boron nitride nanosheets IV;
in the invention, the organic solvent I in S1 is a mixed solution of ethanolamine and water, and MEA is H2 O= (6-8): (4:2), preferably MEA is H2 O=7:3;
and/or S1 ultrasonic temperature is 40-60 ℃, ultrasonic time is 4-6 h, and ultrasonic condition is 50 ℃ and 4-6 h is preferable;
and/or S1 vacuum drying temperature is 70-90 ℃;
and/or, S2 the solution III is sodium hydroxide solution;
and/or S2, wherein the reaction temperature of the hydrothermal kettle is 120-130 ℃;
and/or S2, the reaction time of the hydrothermal kettle is 12-36h;
and/or the S2 drying temperature is 70-90 ℃.
In the invention, the solvent V of SS1 is absolute ethyl alcohol, and the ultrasonic treatment time is 0.5-2h;
and/or, the ultrasonic dispersion time of SS2 is 2-4 hours;
and/or the adding mass ratio of the hydroxyl functional hexagonal boron nitride nanosheets IV to the Phytic Acid (PA) is 1 (1-5);
in the invention, the reaction time of SSS1 is 4-6 h, and the reaction temperature is 60-70 ℃;
in the invention, the polyamide with carboxyl groups at the end groups of the SSS1 is selected from one or more of polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 1012, polyamide 612 and the like;
in the invention, the organic solvent V of the SSS1 is N, N-Dimethylformamide (DMF), and the mass ratio of polyamide powder to the organic solvent is 1: (4-6);
and/or SSS1 said polyamide powder to VI mass ratio is (500 to 50): 1, preferably (100 to 200): 1;
and/or, the vacuum drying temperature of the SSS2 is 80-100 ℃;
and/or the auxiliary agent SSS2 comprises one or more of 0.1-1 part of antioxidant, 0.1-0.5 part of flatting agent, 0.1-0.5 part of flow auxiliary agent and 0.1-1 part of pigment by taking nylon powder as 100 parts.
And/or the antioxidant SSS2 is a hindered phenol antioxidant and phosphite antioxidant complex, the leveling agent is an acrylic ester leveling agent, the flow aid is fumed silica or fumed alumina, and the pigment comprises toner and pearl powder.
In another aspect, the invention also provides the high-adhesion anticorrosive polyamide powder coating prepared by the preparation method, and the polyamide powder coating is (BNSs-OH) -PA/polyamide composite coating.
In the invention, a phosphoric acid group in phytic acid reacts with a hydroxyl functional hexagonal boron nitride nano-sheet to form a covalent bond, and phytic acid PA is loaded on the hydroxyl functional hexagonal boron nitride nano-sheet BNSs-OH, so that the phytic acid PA is subjected to esterification reaction with a polyamide end group to improve the dispersibility of the phytic acid PA, and the polyamide powder coating with high adhesive force and high barrier property is obtained; the phytic acid can form a plurality of chelate rings with metal ions in a wider pH value range, a layer of compact protective film is easy to form on the surface of the metal when the phytic acid is subjected to coordination reaction with the metal, a corrosion medium is effectively organized to permeate into the surface of the metal below the coating, a better protective effect is achieved, corrosion inhibition efficiency is improved, and meanwhile, the film layer of the phytic acid can react with polar groups in polyamide, so that the adhesive force between the coating and the metal is enhanced; the hexagonal boron nitride (h-BN) has a layered crystal structure, each layer is connected by B, N atoms through polar B-N bonds and is arranged into a hexagonal annular network, the layers are combined through weak intermolecular force Van der Waals force, and the weak non-bond interaction enables massive hexagonal boron nitride crystal particles to be peeled into boron nitride nano sheets, and the hexagonal network structure of the h-BN provides good gas and liquid barrier property and can be applied to corrosion protection of metals; the polyamide powder coating has high adhesive force and excellent corrosion resistance under the multiple synergistic corrosion resistance of the phytic acid and the modified boron nitride nano-sheets, can be widely applied to various fields of metal pipelines, ships and the like, overcomes the application limitation of the existing materials in a high-humidity environment, and improves the stability of the polyamide powder coating.
Compared with the prior art, the invention has the following positive effects:
(1) Loading phytic acid PA on hydroxyl functionalized hexagonal boron nitride nano-sheets BNSs-OH, and carrying out esterification reaction on the phytic acid PA and polyamide end groups to improve the dispersibility of the phytic acid PA and obtain the polyamide powder coating with high adhesive force and high barrier property;
(2) The polyamide powder coating can be widely applied to various fields such as metal pipelines, ships and the like, overcomes the limitation of the application of the existing material in a high-humidity environment, and improves the stability of the polyamide powder coating.
Detailed Description
The present invention is further illustrated by the following specific examples, which are given by way of illustration only and are not intended to limit the scope of the invention.
Main raw material information: hexagonal boron nitride with an average particle size of 100nm; phytic acid, shanghai Ala Biochemical technologies Co., ltd; ethanolamine, absolute ethanol, sodium hydroxide, N-dimethylformamide, analytically pure, national pharmaceutical group chemical reagent company, inc; polyamide 12 powder, wanamid D1101, vancomic chemical group inc; polyamide 11 powder, rilsan 7452, archema; polyamide 1012 powder, ME TAMID, shanghai kefu chemical company, inc.
Instrument and equipment information: numerical control ultrasonic cleaner, kunshan ultrasonic instruments limited; desk-top centrifuge, hunan Instrument laboratory instruments development Co., ltd; the heat-collecting type constant-temperature heating magnetic stirrer consolidates the Limited liability company of the Chinese instruments in the market; vacuum drying oven, shanghai macroinstrumentation Co.
Example 1
Preparing hydroxyl functional hexagonal boron nitride nanosheets:
s1: dispersing 4.0g of hexagonal boron nitride (H-BN) in 800mL of ethanol amine and water solvent (MEA: H2O=6:4), carrying out ultrasonic treatment at 40 ℃ for 8 hours, centrifuging for 30 minutes to obtain an upper layer composition, filtering, washing with ethanol for three times, and carrying out vacuum drying at 80 ℃ for 12 hours to obtain BNSs nanosheets;
s2: dispersing 1.0g BNSs nano-sheets in 5mol/L sodium hydroxide solution with the concentration of 100mL, transferring to a hydrothermal kettle after uniform dispersion, reacting for 24 hours at 120 ℃, cooling to room temperature after the reaction is finished, centrifuging for 5 minutes, washing with deionized water to be neutral, and vacuum drying at 80 ℃ for 12 hours to obtain hydroxyl functional hexagonal boron nitride nano-sheets BNSs-OH;
preparation of (BNSs-OH) -PA:
SS1: dispersing 1g of hydroxyl functionalized hexagonal boron nitride nano-sheets BNSs-OH in 100mL of absolute ethyl alcohol, and carrying out ultrasonic treatment for 1h;
SS2: adding 1g of phytic acid PA into the solution, continuously performing ultrasonic dispersion for 3 hours until the reaction is finished, centrifuging for 10 minutes, collecting precipitate, washing with deionized water for five times, and vacuum drying the obtained solid at 80 ℃ for 12 hours to obtain (BNSs-OH) -PA.
Preparation of (BNSs-OH) -PA/polyamide composite polyamide 12 powder coating:
SSS1: 10g of polyamide 12 powder Wanamid D1101 containing terminal carboxyl groups is placed in 45mLDMF, after full dispersion, 0.02g (BNSS-OH) -PA is added, and the mixture is continuously dispersed by ultrasonic at 70 ℃ and stirred for 6 hours, and after the reaction is finished, slurry is obtained;
SSS2: centrifuging the slurry for 10min, vacuum drying at 80 ℃ to remove the solvent, adding 0.5 part of antioxidants 1098 and 168 and 0.3 part of acrylic leveling agents, and mixing to obtain the anti-corrosion polyamide powder coating with target adhesive force.
Example 2
Preparing hydroxyl functional hexagonal boron nitride nanosheets:
s1: dispersing 4.0g of hexagonal boron nitride (H-BN) in 800mL of ethanol amine and water solvent (MEA: H2O=8:2), carrying out ultrasonic treatment at 60 ℃ for 4 hours, centrifuging for 30 minutes to obtain an upper layer composition, filtering, washing with ethanol for three times, and carrying out vacuum drying at 80 ℃ for 12 hours to obtain BNSs nanosheets;
s2: dispersing 1.2g BNSs nano-sheets in 5mol/L sodium hydroxide solution with the concentration of 150mL, transferring to a hydrothermal kettle after uniform dispersion, reacting for 24 hours at 130 ℃, cooling to room temperature after the reaction is finished, centrifuging for 5 minutes, washing with deionized water to be neutral, and vacuum drying at 80 ℃ for 12 hours to obtain hydroxyl functional hexagonal boron nitride nano-sheets BNSs-OH;
preparation of (BNSs-OH) -PA:
SS1: dispersing 0.5g of hydroxyl functionalized hexagonal boron nitride nano-sheets BNSs-OH in 100mL of absolute ethyl alcohol, and carrying out ultrasonic treatment for 1h;
SS2: 2.5g of phytic acid PA is added into the solution, ultrasonic dispersion is continued for 4 hours until the reaction is finished, the solution is centrifuged for 10 minutes, the precipitate is collected and washed with deionized water for five times, and the obtained solid is dried in vacuum at 80 ℃ for 12 hours, so as to obtain (BNSs-OH) -PA.
Preparation of (BNSs-OH) -PA/polyamide composite polyamide powder coating:
SSS1: 10g of polyamide 11 powder Rilsan 7452 containing terminal carboxyl groups is placed in 60mLDMF, after full dispersion, 0.2g (BNSs-OH) -PA is added, and the mixture is continuously dispersed by ultrasonic at 60 ℃ and stirred for 4 hours, and after the reaction is finished, slurry is obtained;
SSS2: centrifuging the slurry for 10min, vacuum drying at 80 ℃ to remove the solvent, and mixing antioxidants 1098 and 168 and an acrylic leveling agent to obtain the anti-corrosion polyamide powder coating with target adhesive force.
Example 3
Preparing hydroxyl functional hexagonal boron nitride nanosheets:
s1: dispersing 4.0g of hexagonal boron nitride (H-BN) in 800mL of ethanol amine and water solvent (MEA: H2O=7:3), carrying out ultrasonic treatment at 50 ℃ for 6 hours, centrifuging for 30 minutes to obtain an upper layer composition, filtering, washing with ethanol for three times, and carrying out vacuum drying at 80 ℃ for 12 hours to obtain BNSs nanosheets;
s2: dispersing 1.2g BNSs nano-sheets in 5mol/L sodium hydroxide solution with the concentration of 150mL, transferring to a hydrothermal kettle after uniform dispersion, reacting for 24 hours at 127 ℃, cooling to room temperature after the reaction is finished, centrifuging for 5 minutes, washing with deionized water to be neutral, and vacuum drying at 80 ℃ for 12 hours to obtain hydroxyl functional hexagonal boron nitride nano-sheets BNSs-OH;
preparation of (BNSs-OH) -PA:
SS1: dispersing 0.5g of hydroxyl functionalized hexagonal boron nitride nano-sheets BNSs-OH in 100mL of absolute ethyl alcohol, and carrying out ultrasonic treatment for 1h;
SS2: 1.5g of phytic acid PA is added into the solution, ultrasonic dispersion is continued for 4 hours until the reaction is finished, the solution is centrifuged for 10 minutes, the precipitate is collected and washed with deionized water for five times, and the obtained solid is dried in vacuum at 80 ℃ for 12 hours, so as to obtain (BNSs-OH) -PA.
Preparation of (BNSs-OH) -PA/polyamide composite polyamide powder coating:
SSS1: 10g of polyamide 1012 powder METAMID containing carboxyl groups is placed in 60mLDMF, after full dispersion, 0.06g (BNSS-OH) -PA is added, continuous ultrasonic dispersion is carried out at 50 ℃ and stirring is carried out for 5 hours, and slurry is obtained after the reaction is finished;
SSS2: centrifuging the slurry for 10min, vacuum drying at 80 ℃ to remove the solvent, adding 0.5 part of antioxidants 1098 and 168 and 0.3 part of acrylic leveling agents, and mixing to obtain the anti-corrosion polyamide powder coating with target adhesive force.
Comparative example 1
The difference compared with example 1 is that (BNSs-OH) -PA is not added, and the nylon powder is pure nylon 12 powder containing carboxyl terminal groups.
Comparative example 2
Preparing hydroxyl functional hexagonal boron nitride nanosheets:
s1: dispersing 4.0g of hexagonal boron nitride (H-BN) in 800mL of ethanol amine and water solvent (MEA: H2O=6:4), carrying out ultrasonic treatment at 40 ℃ for 8 hours, centrifuging for 30 minutes to obtain an upper layer composition, filtering, washing with ethanol for three times, and carrying out vacuum drying at 80 ℃ for 12 hours to obtain BNSs nanosheets;
s2: dispersing 1.0g BNSs nano-sheets in 5mol/L sodium hydroxide solution with the concentration of 100mL, transferring to a hydrothermal kettle after uniform dispersion, reacting for 24 hours at 120 ℃, cooling to room temperature after the reaction is finished, centrifuging for 5 minutes, washing with deionized water to be neutral, and vacuum drying at 80 ℃ for 12 hours to obtain hydroxyl functional hexagonal boron nitride nano-sheets BNSs-OH;
preparation of (BNSs-OH) -PA/polyamide composite polyamide 12 powder coating:
SSS1: 10g of polyamide powder containing terminal carboxyl groups is placed in 45mLDMF, after full dispersion, 0.02g of BNSS-OH is added, continuous ultrasonic dispersion is carried out at 70 ℃ and stirring is carried out for 6 hours, and after the reaction is finished, slurry is obtained;
SSS2: centrifuging the slurry for 10min, vacuum drying at 80 ℃ to remove the solvent, adding 0.5 part of antioxidants 1098 and 168 and 0.3 part of acrylic leveling agents, and mixing to obtain the anti-corrosion polyamide powder coating with target adhesive force.
Comparative example 3
Preparing hydroxyl functional hexagonal boron nitride nanosheets:
s1: dispersing 4.0g of hexagonal boron nitride (H-BN) in 800mL of ethanol amine and water solvent (MEA: H2O=6:4), carrying out ultrasonic treatment at 40 ℃ for 8 hours, centrifuging for 30 minutes to obtain an upper layer composition, filtering, washing with ethanol for three times, and carrying out vacuum drying at 80 ℃ for 12 hours to obtain BNSs nanosheets;
s2: dispersing 1.0g BNSs nano-sheets in 5mol/L sodium hydroxide solution with the concentration of 100mL, transferring to a hydrothermal kettle after uniform dispersion, reacting for 24 hours at 120 ℃, cooling to room temperature after the reaction is finished, centrifuging for 5 minutes, washing with deionized water to be neutral, and vacuum drying at 80 ℃ for 12 hours to obtain hydroxyl functional hexagonal boron nitride nano-sheets BNSs-OH;
preparation of (BNSs-OH) -PA:
SS1: dispersing 1g of hydroxyl functionalized hexagonal boron nitride nano-sheets BNSs-OH in 100mL of absolute ethyl alcohol, and carrying out ultrasonic treatment for 1h;
SS2: adding 1g of phytic acid PA into the solution, continuously performing ultrasonic dispersion for 3 hours until the reaction is finished, centrifuging for 10 minutes, collecting precipitate, washing with deionized water for five times, and vacuum drying the obtained solid at 80 ℃ for 12 hours to obtain (BNSs-OH) -PA. Preparation of (BNSs-OH) -PA/polyamide composite polyamide 12 powder coating:
SSS1: 10g of polyamide 12 powder without terminal carboxyl groups is placed in 45mLDMF, after full dispersion, 0.02g (BNSs-OH) -PA is added, continuous ultrasonic dispersion is carried out at 70 ℃ and stirring is carried out for 6 hours, and after the mixing is finished, a mixture slurry is obtained; wherein the preparation method of the polyamide 12 powder without carboxyl end group of SSS1 comprises the following steps: adding 5kg of laurolactam, 400g of water and 25g of benzoic acid into a polymerization reaction kettle, heating to 280 ℃ for hydrolysis ring-opening reaction for 2 hours, cooling to 260 ℃ for decompression polycondensation for 6 hours, and bracing, granulating and drying to obtain nylon 12 particles; 4kg of nylon 12 particles are placed in 20kg of absolute ethyl alcohol, and after the temperature is raised to 150 ℃ and the nylon 12 particles are completely dissolved, the temperature is slowly reduced to normal temperature, and polyamide 12 powder is obtained. SSS2: centrifuging the slurry for 10min, vacuum drying at 80 ℃ to remove the solvent, and mixing antioxidants 1098 and 168 and an acrylic leveling agent to obtain the anti-corrosion polyamide powder coating with target adhesive force. Evaluation of polyamide coating:
the coating adhesion was tested using a bond strength tester, i.e., a pullout tester, and the corrosion resistance of the coating was characterized using a salt spray resistance test, and the test results of example 1 and comparative example 1 are shown in table 1.
TABLE 1 coating Performance test results
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A method for preparing a high adhesion corrosion resistant polyamide powder coating, the method comprising the steps of:
(1) Preparation of (BNSs-OH) -phytic acid
SS1: dispersing the hydroxyl functionalized hexagonal boron nitride nanosheets IV in an organic solvent V, and carrying out ultrasonic treatment;
SS2: adding phytic acid into SS1 solution, continuously dispersing by ultrasonic until the reaction is finished, and obtaining a product VI after centrifugation, washing by deionized water and vacuum drying;
(2) Preparation of powder coating
SSS1: placing polyamide powder with carboxyl at the end group in an organic solvent V, fully dispersing, adding a product VI, continuously performing ultrasonic dispersion and stirring, and obtaining slurry VII after the reaction is finished;
SSS2: centrifuging the slurry VII, washing the slurry VII with deionized water for a plurality of times, vacuum drying, adding an auxiliary agent, and mixing to obtain the high-adhesion anticorrosive polyamide powder coating;
the mass ratio of the hydroxyl functional hexagonal boron nitride nanosheets IV to the phytic acid is 1 (1-5); the mass ratio of the polyamide powder with carboxyl groups at the end groups of SSS1 to the product VI is (500-50): 1.
2. The preparation method of claim 1, wherein the hydroxyl-functionalized hexagonal boron nitride nanosheets IV are functionalized hexagonal boron nitride nanosheets having hydroxyl groups on the surfaces, and the preparation steps of the hydroxyl-functionalized hexagonal boron nitride nanosheets IV are as follows:
s1: dispersing hexagonal boron nitride (h-BN) in an organic solvent I, carrying out ultrasonic treatment, centrifuging to obtain an upper layer composition, and filtering, washing and vacuum drying to obtain BNSS nanosheets II;
s2: and dispersing the BNSs nanosheets II in the solution III, transferring to a hydrothermal kettle for reaction, cooling to room temperature after the reaction is finished, centrifuging, separating, washing with deionized water to neutrality, and drying to obtain the hydroxyl functionalized hexagonal boron nitride nanosheets IV.
3. The process according to claim 2, wherein S1 is a mixed solution of ethanol amine and water, MEA: H 2 O= (6-8): (4:2); and/or S1 ultrasonic temperature is 40-60 ℃ and ultrasonic time is 4-6 h.
4. The method of claim 2, wherein S2 said solution III is sodium hydroxide solution;
and/or S2, wherein the reaction temperature of the hydrothermal kettle is 120-130 ℃;
and/or the reaction time of the hydrothermal kettle in the step S2 is 12-36h.
5. The method according to any one of claims 1 to 4, wherein the organic solvent V of SS1 is absolute ethanol and the time of the ultrasonic treatment is 0.5 to 2 hours; and/or the ultrasonic dispersion time of SS2 is 2-4 h.
6. The process according to any one of claims 1 to 4, wherein the polyamide powder having carboxyl groups at the end groups of SSS1 is one or more selected from the group consisting of polyamide 6, polyamide 66, polyamide 11, polyamide 12, polyamide 1012, and polyamide 612.
7. The process according to any one of claims 1 to 4, wherein the mass ratio of polyamide powder containing carboxyl groups at the end groups of SSS1 to organic solvent V is 1: (4-6).
8. The process according to any one of claims 1 to 4, wherein the reaction time of SSS1 is 4 to 6 hours and the reaction temperature is 60 to 70 ℃.
9. The method of any one of claims 1-4, wherein the aid for SSS2 comprises one or more of an antioxidant, a leveling agent, a flow aid, and a pigment.
10. A high adhesion corrosion resistant polyamide powder coating prepared by the method of any one of claims 1-9.
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