CN114656877A - Hydrophobic coating for anti-wall-hanging container barrel and preparation method thereof - Google Patents
Hydrophobic coating for anti-wall-hanging container barrel and preparation method thereof Download PDFInfo
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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Abstract
The invention discloses a hydrophobic coating for a wall-hung prevention container barrel and a preparation method thereof; the materials required for the hydrophobic coating comprise, by weight: 40-60 parts of matrix resin, 5-30 parts of nano-cellulose microspheres, 1-20 parts of modified bismuth oxyhalide, 1-5 parts of curing agent and 50-90 parts of solvent. The nano-cellulose is used for coating polystyrene, the length of the nano-cellulose is controlled, the water contact angle of the coating can be improved, in order to prevent the reduction of the rolling angle of the coating, a low-surface-energy substance crosslinked polydimethylsiloxane is added, and bismuth oxyhalide is continuously added into the coating, so that the coating has double self-cleaning performance. According to the invention, all substances in the coating are subjected to hydrophobic modification, so that the coating has hydrophobicity, the coating can have hydrophobicity, self-repairability and corrosion resistance by adding the nano-cellulose microspheres, and the coating has double self-cleaning property by adding the bismuth oxyhalide.
Description
Technical Field
The invention relates to the technical field of hydrophobic coatings, in particular to a hydrophobic coating for a wall-hung prevention container barrel and a preparation method thereof.
Background
Hydrophobic coatings are commonly used in the fields of self-cleaning, oil-water separation and the like due to the special wettability of the surfaces of the hydrophobic coatings. However, with the development of science and technology, the requirements for hydrophobic coatings are also higher and higher, and the coatings are required to have corrosion resistance, high temperature resistance, heat resistance, good adhesion with matrix materials and the like.
Common coating matrix resins include organic silicon resin, epoxy resin and the like, but hydrophobic substances can only avoid the entry of water molecules and cannot remove organic substances on the surface of a coating, in order to improve the self-cleaning property of the coating, a titanium dioxide photocatalyst is often added into the coating, oily pollutants adhered to the surface of the coating are removed by using ultraviolet rays, but the content of the ultraviolet rays is only 5% in sunlight, so the effect of adding titanium dioxide into the hydrophobic coating is not ideal.
And the inorganic substance added into the coating can reduce the adhesive force between the coating and the base material, the coating is easy to fall off, and the wear resistance and the hydrophobicity of the coating are reduced. Therefore, there is a need for an improved method of preparing a hydrophobic coating to solve the above problems.
Disclosure of Invention
The invention aims to provide a hydrophobic coating for a wall-hung prevention container barrel and a preparation method thereof, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
a preparation method of a hydrophobic coating for an anti-wall-hanging container barrel comprises the following steps:
s1: dissolving o-aldehyde phenylboronic acid and bisaminopropyl-terminated polydimethylsiloxane into an absolute ethanol solution, reacting for 2-3 days, cooling to-5-0 ℃, uniformly mixing with sodium borohydride, performing rotary evaporation, adding dichloromethane, extracting, drying, and performing rotary evaporation to obtain crosslinked polydimethylsiloxane;
s2: adding sodium bromide, sodium hypochlorite and 2,2,6, 6-tetramethylpiperidine oxide into aqueous solution of hardwood pulp board, adjusting pH to 9.5-10, maintaining for 10-20min, washing, and homogenizing under high pressure to obtain transparent product, i.e. nanocellulose; dissolving octadecylamine in an absolute ethyl alcohol solution, adding nano cellulose, adjusting the pH value of the solution to 7-8, washing, and drying to obtain modified cellulose;
s3: dissolving modified cellulose in styrene, adding an oil phase and a water phase, carrying out ultrasonic reaction for 1-5min, continuing to react for 8-12h at 60-70 ℃, washing, drying, dissolving in a tetrahydrofuran solution, and uniformly mixing with cross-linked polydimethylsiloxane to obtain nano-cellulose microspheres;
s4: uniformly mixing matrix resin, nano-cellulose microspheres, modified bismuth oxyhalide, a curing agent and a solvent, spraying the mixture on a container barrel, and drying to obtain the hydrophobic coating.
In a more optimized scheme, the materials required by the hydrophobic coating comprise, by weight: 40-60 parts of matrix resin, 5-30 parts of nano-cellulose microspheres, 1-20 parts of modified bismuth oxyhalide, 1-5 parts of curing agent and 50-90 parts of solvent.
In an optimized scheme, the matrix resin is one or more of epoxy resin, organic silicon resin and furan resin; the curing agent is one or more of xylylenediamine, imidazole and m-phenylenediamine; the solvent is one or more of deionized water, absolute ethyl alcohol, acetone and isopropanol.
According to an optimized scheme, the preparation method of the modified bismuth oxyhalide comprises the following steps: mixing the glycerol solution of sodium chloride and the glycerol solution of bismuth nitrate pentahydrate uniformly, reacting for 16h at the temperature of 140 ℃ and 160 ℃, cooling, washing, filtering, drying, dissolving in the normal hexane solution, mixing with perfluorodecyl triethoxysilane uniformly, reacting for 1-3h, and drying to obtain the modified bismuth oxyhalide.
In an optimized scheme, in the step S3, the oil phase is divinylbenzene and azobisisobutyronitrile; the water phase is cellulose and deionized water; the mass ratio of the oil phase to the water phase is 1: 4.
In an optimized scheme, the preparation method of the cellulose comprises the following steps: heating to 40-60 deg.C, stirring broadleaf wood pulp board and sulfuric acid, reacting for 1-2 hr, dialyzing, and adjusting pH to obtain cellulose; the length of the cellulose is 180-190 nm.
In the preferred embodiment, in step S2, the number of high-pressure homogenization cycles is 10, and the length of the nanocellulose is 300-320 nm.
In an optimized scheme, in step S2, the mass ratio of octadecylamine to nanocellulose is 3: 1.
In an optimized scheme, the thickness of the coating is 0.4-0.8 mu m.
According to an optimized scheme, the hydrophobic coating is prepared by the preparation method of the hydrophobic coating for the anti-wall-hanging container barrel.
The hydrophobic coating capable of self-repairing is prepared by preparing nano-cellulose by an oxidation method, and performing hydrophobic modification on the nano-cellulose, so that the hydrophobicity of the coating can be improved. The high-pressure circulation frequency is controlled to enable the length of the nano-cellulose to be between 300-320nm, when the length of the fiber is too long, the suspension and the granularity of the nano-cellulose are increased, the hydrophobicity of the coating is reduced, the cellulose prepared by the oxidation method can form grooves on the surface of the microsphere, when water is met, liquid drops can be gathered on the surface of the microsphere, and in the drying process of the liquid drops, short fibers can generate a rough structure on the surface of the microsphere again to keep the hydrophobicity of the coating. When the fiber is too long, the coarse structure is prevented from being regenerated, so that the hydrophobicity is reduced. Similarly, when the cellulose microspheres are prepared by using an emulsification method, the cellulose in water is prepared by using an acid method, and the length of the cellulose is controlled to be between 180 and 190nm, so that the hydrophobicity of the coating is improved. The composite microsphere prepared by coating polystyrene with nanocellulose can improve the self-cleaning property of the coating, improve the content of nanocellulose in the oil phase, reduce the particle size of the microsphere, enrich nanoparticles and intertwined nanocellulose on the surface of the microsphere, make the surface structure rougher and convert the coating into super-hydrophobicity. The application continues to add the cross-linked polydimethylsiloxane, so that a small part of the cross-linked polydimethylsiloxane covers the surface of the nano-cellulose microsphere, and the surface energy and the rolling angle of the coating are reduced. Meanwhile, the cross-linked polydimethylsiloxane can enable the coating to have self-repairing performance, when the surface of the coating is damaged, the cross-linked polydimethylsiloxane can be subjected to oxidative decomposition to enable the coating to be changed into hydrophilic performance, but when the coating is placed in a room-temperature environment, the cross-linked polydimethylsiloxane can absorb moisture in the environment to enable polar groups to migrate into the coating, intermediate products can move to an oxidation area to continuously reduce the surface energy of the coating, and when water molecules in the coating are gradually volatilized, the cross-linked polydimethylsiloxane can be regenerated to enable the coating to be continuously changed into hydrophobic performance, so that a self-repairing process is formed.
The nano-cellulose microspheres are added into the coating, so that the adhesion between the coating and the container barrel can be improved, and the surface roughness of the container barrel is improved. The inorganic nano material is prevented from being used as microspheres to be added into the coating, the inorganic nano material can improve the surface roughness of the container barrel, but the inorganic nano material and the container barrel are poor in cohesiveness and easy to be impacted by external substances or touched by hands, and the coating can fall off.
Finally, use furan resin and organic silicon resin to blend, can take place the solidification crosslinking method and respond, the coating can become network structure to the cohesiveness between furan and the container bucket is better, and consequently the coating is difficult for droing, because the adhesion between coating and the container bucket can lead to corrosive substance can not advance as between container bucket and the coating, has improved the corrosion resistance of coating, can play the guard action to the container bucket. Bismuth oxyhalide with high visible light catalytic activity is continuously added to perform hydrophobic modification, so that the hydrophobicity of the coating is further improved, and the bismuth oxyhalide has high photocatalytic activity, so that organic pollutants adhered to the surface of the coating can be degraded, inorganic matters and organic pollutants can be removed from the coating, and the coating has double self-cleaning performance.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, all substances in the coating are subjected to hydrophobic modification, so that the coating has hydrophobicity, the coating can have hydrophobicity, self-repairability and corrosion resistance by adding the nano-cellulose microspheres, and the coating has double self-cleaning property by adding the bismuth oxyhalide.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1: a preparation method of a hydrophobic coating for a wall-hung prevention container barrel is characterized by comprising the following steps: the method comprises the following steps:
s1: dissolving 0.3 part of o-formyl phenylboronic acid and 2 parts of bisaminopropyl-terminated polydimethylsiloxane in 5 parts of absolute ethyl alcohol solution, reacting at room temperature for 2 days, cooling to-5 ℃, uniformly mixing with 0.1 part of sodium borohydride, performing rotary evaporation, adding 100 parts of dichloromethane for dissolving, sequentially extracting with sodium bicarbonate solution, deionized water and chlorinated solution, drying with anhydrous magnesium sulfate, and performing rotary evaporation to obtain the crosslinked polydimethylsiloxane;
s2: heating to 40 ℃, stirring 40 parts of hardwood pulp board and 8 parts of sulfuric acid for reaction for 1 hour, adding deionized water for dilution, and dialyzing with the deionized water to be neutral, namely cellulose;
s3: adding 4 parts of sodium bromide, 0.5 part of sodium hypochlorite and 0.6 part of 2,2,6, 6-tetramethylpiperidine oxide into 1% hardwood pulp aqueous solution, adjusting the pH value of the solution to 9.5, keeping the pH value for 10min, washing the solution to be neutral by using deionized water, performing high-pressure homogenization circulation to be transparent, and performing high-pressure homogenization circulation for 10 times to obtain the nano-cellulose; dissolving 24 parts of octadecylamine in 10 parts of absolute ethanol solution, adding 8 parts of nano-cellulose aqueous solution, adjusting the pH value of the solution to 7, continuously reacting for 4 hours on a shaking table, wherein the shaking table is 250 r.min-1Washing with absolute ethyl alcohol at 65 ℃, and drying to obtain modified cellulose;
s4: dissolving 2 parts of modified cellulose in 20 parts of styrene, adding 1.5 parts of divinylbenzene, 0.4 part of azobisisobutyronitrile, 0.5 part of cellulose and 7.1 parts of deionized water, carrying out ultrasonic reaction for 1min, continuing to react for 8h at 60 ℃, washing with absolute ethyl alcohol, drying, dissolving 0.2 part of modified cellulose in 30 parts of tetrahydrofuran solution, and uniformly mixing with 0.1 part of cross-linked polydimethylsiloxane to obtain the nano-cellulose microspheres;
s5: uniformly mixing 20 parts of glycerol solution of sodium chloride and 20 parts of glycerol solution of bismuth nitrate pentahydrate, reacting for 16 hours at 140 ℃, cooling, washing with deionized water, performing suction filtration, drying, removing 4 parts of solution, dissolving in 40 parts of n-hexane solution, uniformly mixing with 1 part of perfluorodecyl triethoxysilane, reacting for 1 hour, and drying to obtain modified bismuth oxyhalide;
s6: after 32 parts of organic silicon resin and 8 parts of furan resin are uniformly mixed, 5 parts of nano-cellulose microspheres, 1 part of modified bismuth oxyhalide, 1 part of m-phenylenediamine and 50 parts of acetone are uniformly mixed, sprayed on a container barrel and dried to obtain the hydrophobic coating.
In this example, the coating thickness was 0.4. mu.m.
Example 2: a preparation method of a hydrophobic coating for a wall-hanging-proof container barrel is characterized by comprising the following steps: the method comprises the following steps:
s1: dissolving 0.4 part of o-aldophenylboronic acid and 2.1 parts of bisaminopropyl-terminated polydimethylsiloxane into 60 parts of absolute ethyl alcohol solution, reacting for 2 days at room temperature, cooling to-3 ℃, uniformly mixing with 0.2 part of sodium borohydride, performing rotary evaporation, adding 105 parts of dichloromethane for dissolving, sequentially extracting with sodium bicarbonate solution, deionized water and chlorinated solution, drying with anhydrous magnesium sulfate, and performing rotary evaporation to obtain the crosslinked polydimethylsiloxane;
s2: heating to 45 ℃, stirring 41 parts of broadleaf wood pulp board and 10 parts of sulfuric acid for reaction for 1.1h, adding deionized water for dilution, and dialyzing with the deionized water to be neutral, thus obtaining cellulose;
s3: adding 5 parts of sodium bromide, 0.6 part of sodium hypochlorite and 0.7 part of 2,2,6, 6-tetramethylpiperidine oxide into 1% hardwood pulp aqueous solution, adjusting the pH value of the solution to 9.6, keeping for 12min, washing with deionized water to be neutral, performing high-pressure homogenization circulation to be transparent, and performing high-pressure homogenization circulation for 10 times to obtain the nano-cellulose; dissolving 25 parts of octadecylamine in 12 parts of absolute ethyl alcohol solution, adding 8.5 parts of nano-cellulose aqueous solution, adjusting the pH value of the solution to 7.2, and continuously reacting for 4.5 hours on a shaking table at 250 r.min-1Washing with absolute ethyl alcohol at 65 ℃, and drying to obtain modified cellulose;
s4: dissolving 3 parts of modified cellulose in 25 parts of styrene, adding 2 parts of divinylbenzene, 0.42 part of azobisisobutyronitrile, 2 parts of cellulose and 7.68 parts of deionized water, carrying out ultrasonic reaction for 2min, continuing to react for 9h at 62 ℃, washing with absolute ethyl alcohol, drying, dissolving 0.3 part of modified cellulose in 32 parts of tetrahydrofuran solution, and uniformly mixing with 0.12 part of cross-linked polydimethylsiloxane to obtain the nano-cellulose microspheres;
s5: uniformly mixing 22 parts of glycerol solution of sodium chloride and 22 parts of glycerol solution of bismuth nitrate pentahydrate, reacting at 145 ℃ for 16 hours, cooling, washing with deionized water, performing suction filtration, drying, removing 5 parts of the dried mixture, dissolving the dried mixture in 42 parts of n-hexane solution, uniformly mixing with 2 parts of perfluorodecyl triethoxysilane, reacting for 2 hours, and drying to obtain modified bismuth oxyhalide;
s6: after 40 parts of organic silicon resin and 9 parts of furan resin are uniformly mixed, 15 parts of nano-cellulose microspheres, 10 parts of modified bismuth oxyhalide, 2 parts of m-phenylenediamine and 60 parts of acetone are added and uniformly mixed, and then the mixture is sprayed on a container barrel and dried, so that the hydrophobic coating is obtained.
In this example, the coating thickness was 0.5. mu.m.
Example 3: a preparation method of a hydrophobic coating for a wall-hung prevention container barrel is characterized by comprising the following steps: the method comprises the following steps:
s1: dissolving 0.5 part of o-aldophenylboronic acid and 2.5 parts of bisaminopropyl-terminated polydimethylsiloxane into 8 parts of absolute ethyl alcohol solution, reacting for 3 days at room temperature, cooling to-0 ℃, uniformly mixing with 0.3 part of sodium borohydride, performing rotary evaporation, adding 115 parts of dichloromethane for dissolution, sequentially extracting with sodium bicarbonate solution, deionized water and chlorinated solution, drying with anhydrous magnesium sulfate, and performing rotary evaporation to obtain the crosslinked polydimethylsiloxane;
s2: heating to 55 ℃, stirring 43 parts of hardwood pulp board and 12 parts of sulfuric acid for reaction for 1.8 hours, adding deionized water for dilution, and dialyzing with the deionized water to be neutral, namely cellulose;
s3: adding 7 parts of sodium bromide, 0.8 part of sodium hypochlorite and 08 parts of 2,2,6, 6-tetramethylpiperidine oxide into 1% hardwood pulp aqueous solution, adjusting the pH value of the solution to 9.8, keeping for 18min, washing the solution to be neutral by deionized water, performing high-pressure homogenization circulation to be transparent, and performing high-pressure homogenization circulation for 10 times to obtain the nano-cellulose; dissolving 28 parts of octadecylamine in 16 parts of absolute ethanol solution, adding 9.5 parts of nano-cellulose aqueous solution, adjusting the pH value of the solution to 7.8, and continuously reacting for 5.5 hours on a shaking table at 250 r.min-1Washing with absolute ethyl alcohol at 65 ℃, and drying to obtain modified cellulose;
s4: dissolving 4 parts of modified cellulose in 30 parts of styrene, adding 2.5 parts of divinylbenzene, 0.45 part of azobisisobutyronitrile, 5 parts of cellulose and 6.8 parts of deionized water, carrying out ultrasonic reaction for 4min, continuing to react for 11h at 68 ℃, washing with absolute ethyl alcohol, drying, dissolving 0.4 part of modified cellulose in 38 parts of tetrahydrofuran solution, and uniformly mixing with 0.18 part of cross-linked polydimethylsiloxane to obtain the nano-cellulose microspheres;
s5: uniformly mixing 28 parts of glycerol solution of sodium chloride and 28 parts of glycerol solution of bismuth nitrate pentahydrate, reacting at 155 ℃ for 16 hours, cooling, washing with deionized water, performing suction filtration, drying, removing 7 parts of solution, dissolving in 55 parts of n-hexane solution, uniformly mixing with 2.5 parts of perfluorodecyl triethoxysilane, reacting for 2.5 hours, and drying to obtain modified bismuth oxyhalide;
s6: after 45 parts of organic silicon resin and 11 parts of furan resin are uniformly mixed, 25 parts of nano-cellulose microspheres, 15 parts of modified bismuth oxyhalide, 4 parts of m-phenylenediamine and 80 parts of acetone are uniformly mixed, sprayed on a container barrel and dried to obtain the hydrophobic coating.
In this example, the coating thickness was 0.7. mu.m.
Example 4: a preparation method of a hydrophobic coating for a wall-hung prevention container barrel is characterized by comprising the following steps: the method comprises the following steps:
s1: dissolving 0.8 part of o-aldophenylboronic acid and 3 parts of bisaminopropyl-terminated polydimethylsiloxane into 10 parts of absolute ethanol solution, reacting for 3 days at room temperature, cooling to 0 ℃, uniformly mixing with 0.5 part of sodium borohydride, performing rotary evaporation, adding 120 parts of dichloromethane for dissolution, sequentially extracting with sodium bicarbonate solution, deionized water and chlorinated solution, drying with anhydrous magnesium sulfate, and performing rotary evaporation to obtain the crosslinked polydimethylsiloxane;
s2: heating to 60 ℃, stirring 45 parts of hardwood pulp board and 15 parts of sulfuric acid for reaction for 2 hours, adding deionized water for dilution, and dialyzing with the deionized water to be neutral, namely cellulose;
s3: adding 8 parts of sodium bromide, 1 part of sodium hypochlorite and 1 part of 2,2,6, 6-tetramethylpiperidine oxide into 1% hardwood pulp board aqueous solution, adjusting the pH value of the solution to 10, keeping the solution for 20min, washing the solution to be neutral by deionized water, and performing high-pressure homogenization circulation to be transparent, wherein the high-pressure homogenization circulation is performed for 10 times to obtain the nanocellulose; 30 portions of eighteenDissolving amine in 18 parts of anhydrous ethanol solution, adding 10 parts of nano-cellulose aqueous solution, adjusting the pH value of the solution to 8, continuously reacting for 6 hours on a shaking table, wherein the shaking table is 250 r.min-1Washing with absolute ethyl alcohol at 65 ℃, and drying to obtain modified cellulose;
s4: dissolving 5 parts of modified cellulose in 35 parts of styrene, adding 3 parts of divinylbenzene, 0.5 part of azobisisobutyronitrile, 8 parts of cellulose and 6 parts of deionized water, carrying out ultrasonic reaction for 5min, continuing to react at 70 ℃ for 12h, washing with absolute ethyl alcohol, drying, dissolving 0.5 part of modified cellulose in 40 parts of tetrahydrofuran solution, and uniformly mixing with 0.2 part of cross-linked polydimethylsiloxane to obtain the nano-cellulose microspheres;
s5: uniformly mixing 30 parts of glycerol solution of sodium chloride and 30 parts of glycerol solution of bismuth nitrate pentahydrate, reacting for 16 hours at 160 ℃, cooling, washing with deionized water, performing suction filtration, drying, removing 8 parts of solution, dissolving in 60 parts of n-hexane solution, uniformly mixing with 3 parts of perfluorodecyl triethoxysilane, reacting for 3 hours, and drying to obtain modified bismuth oxyhalide;
s6: after mixing 48 parts of organic silicon resin and 12 parts of furan resin uniformly, adding 30 parts of nano-cellulose microspheres, 20 parts of modified bismuth oxyhalide, 5 parts of m-phenylenediamine and 90 parts of acetone, mixing uniformly, spraying on a container barrel, and drying to obtain the hydrophobic coating.
In this example, the coating thickness was 0.8. mu.m.
Comparative example
Comparative example 1: in comparison with example 1, comparative example 1 was prepared in the same manner as described herein without adding crosslinked polydimethylsiloxane.
Comparative example 2: compared with the embodiment 1, the nano-cellulose high-pressure homogenization in the comparative example 2 is circulated for 2 times, and the preparation method is the same as that of the nano-cellulose high-pressure homogenization.
Comparative example 3: in comparison with example 1, comparative example 3 was prepared in the same manner as described herein without adding modified bismuth oxyhalide.
Experimental data
Corrosion resistance: the sample was sprayed with hydrochloric acid solution of pH 3, deionized water of pH 7 and sodium hydroxide solution of pH 11 for 24h, respectively, and the appearance of the sample was observed.
Organic self-cleaning property: dripping ethanol solution of rhodamine B on the surface of the sample, drying in the dark for 30min, irradiating the sample by using a hernia lamp, recording the color value of the sample every 3min until the sample recovers to the self color, and calculating the difference value between the colors before and after degradation.
Self-repairing: subjecting the surface of the sample to O2And after the plasma etching is carried out for 20s, measuring the water contact angle and the rolling angle of the plasma, and after the plasma is placed for 2 days under the conditions of room temperature, sealing and 5% RH, measuring the water contact angle and the rolling angle again.
Table one test result of each of examples 1 to 4 and comparative examples 1 to 3
And (4) conclusion:
1. examples 1-4 are compared to comparative example 1, comparative example 1 with no addition of cross-linked polydimethylsiloxane, resulting in a coating with a large roll angle and no self-healing properties. Adding crosslinked polydimethylsiloxane into the microspheres, so that a small part of the crosslinked polydimethylsiloxane covers the surfaces of the microspheres, and reducing the rolling angle of the coating by using the low surface energy of the crosslinked polydimethylsiloxane so as to enable the coating to have self-repairability.
2. Compared with the comparative example 2, the preparation of the nanocellulose of the comparative example 2 has the advantage that the high-pressure homogenization cycle number is 2, which causes the hydrophobicity of the coating to be reduced, and the reduction of the high-pressure average cycle number can increase the length of the nanocellulose, and can prevent the surface roughness of the microsphere from being regenerated, so that the hydrophobicity is reduced.
3. Compared with the comparative example 3, the comparative example 3 does not add the modified bismuth oxyhalide, so that the difference between the degradation of the rhodamine B of the coating is small, and the hydrophobicity is slightly reduced, which shows that the water contact angle of the coating can be improved by performing hydrophobic modification on the bismuth oxyhalide, and the modified bismuth oxyhalide has photocatalysis and can degrade organic matters on the surface of the coating.
4. When the surface of the coating layer is exposed to O, as seen from self-repairability2After the plasma etching is carried out, the etching solution is dried,the cross-linked polydimethylsiloxane can be rapidly oxidized, so that the coating develops from hydrophobicity to hydrophilicity, the hydrophobicity of the coating can be spontaneously repaired when the coating is placed at room temperature, the new polydimethylsiloxane chain segment can be replenished on the surface of the coating again, the self-repairing of the hydrophobicity is realized, the humidity is controlled to be 5%, the migration of the polydimethylsiloxane chain segment like a damaged part can be limited if the coating is placed in a vacuum environment, and therefore, the hydrophobicity of a sample before etching can be recovered after the sample is placed for 2 days.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of a hydrophobic coating for a wall-hanging-proof container barrel is characterized by comprising the following steps: the method comprises the following steps:
s1: dissolving o-aldehyde phenylboronic acid and bisaminopropyl-terminated polydimethylsiloxane into an absolute ethanol solution, reacting for 2-3 days, cooling to-5-0 ℃, uniformly mixing with sodium borohydride, performing rotary evaporation, adding dichloromethane, extracting, drying, and performing rotary evaporation to obtain crosslinked polydimethylsiloxane;
s2: adding sodium bromide, sodium hypochlorite and 2,2,6, 6-tetramethylpiperidine oxide into aqueous solution of hardwood pulp board, adjusting pH to 9.5-10, maintaining for 10-20min, washing, and homogenizing under high pressure to obtain transparent product, i.e. nanocellulose; dissolving octadecylamine in an absolute ethyl alcohol solution, adding nano cellulose, adjusting the pH value of the solution to 7-8, washing, and drying to obtain modified cellulose;
s3: dissolving modified cellulose in styrene, adding an oil phase and a water phase, carrying out ultrasonic reaction for 1-5min, continuing to react for 8-12h at 60-70 ℃, washing, drying, dissolving in a tetrahydrofuran solution, and uniformly mixing with the cross-linked polydimethylsiloxane to obtain the nano-cellulose microsphere;
s4: uniformly mixing matrix resin, nano-cellulose microspheres, modified bismuth oxyhalide, a curing agent and a solvent, spraying the mixture on a container barrel, and drying to obtain the hydrophobic coating.
2. The method for preparing the hydrophobic coating for the anti-wall-hanging container barrel as claimed in claim 1, wherein the method comprises the following steps: the materials required by the hydrophobic coating comprise, by weight: 40-60 parts of matrix resin, 5-30 parts of nano-cellulose microspheres, 1-20 parts of modified bismuth oxyhalide, 1-5 parts of curing agent and 50-90 parts of solvent.
3. The method for preparing the hydrophobic coating for the anti-wall-hanging container barrel as claimed in claim 2, wherein the method comprises the following steps: the matrix resin is one or more of epoxy resin, organic silicon resin and furan resin; the curing agent is one or more of xylylenediamine, imidazole and m-phenylenediamine; the solvent is one or more of deionized water, absolute ethyl alcohol, acetone and isopropanol.
4. The method for preparing the hydrophobic coating for the anti-wall-hanging container barrel as claimed in claim 1, wherein the method comprises the following steps: the preparation method of the modified bismuth oxyhalide comprises the following steps: mixing the glycerol solution of the sodium chloride and the glycerol solution of the pentahydrate bismuth nitrate uniformly, reacting for 16h at the temperature of 140-160 ℃, cooling, washing, filtering, drying, dissolving in the n-hexane solution, mixing with the perfluorodecyl triethoxysilane uniformly, reacting for 1-3h, and drying to obtain the modified bismuth oxyhalide.
5. The method for preparing the hydrophobic coating for the anti-wall-hanging container barrel as claimed in claim 1, wherein the method comprises the following steps: in step S3, the oil phase is divinylbenzene and azobisisobutyronitrile; the water phase is cellulose and deionized water; the mass ratio of the oil phase to the water phase is 1: 4.
6. The method for preparing the hydrophobic coating for the anti-hanging wall container barrel as claimed in claim 5, wherein the method comprises the following steps: the preparation method of the cellulose comprises the following steps: heating to 40-60 deg.C, stirring broadleaf wood pulp board and sulfuric acid, reacting for 1-2 hr, dialyzing, and adjusting pH to obtain cellulose; the length of the cellulose is 180-190 nm.
7. The method for preparing the hydrophobic coating for the anti-wall-hanging container barrel as claimed in claim 1, wherein the method comprises the following steps: in step S2, the number of high pressure homogenization cycles is 10, and the length of the nanocellulose is 300-320 nm.
8. The method for preparing the hydrophobic coating for the anti-hanging wall container barrel as claimed in claim 1, wherein the method comprises the following steps: in step S2, the mass ratio of octadecylamine to nanocellulose was 3: 1.
9. The method for preparing the hydrophobic coating for the anti-wall-hanging container barrel as claimed in claim 1, wherein the method comprises the following steps: the thickness of the coating is 0.4-0.8 μm.
10. The hydrophobic coating prepared by the preparation method of the hydrophobic coating for the anti-wall-hanging container barrel according to any one of claims 1 to 9.
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