CN115179378B - Preparation method of super-hydrophobic poplar with self-repairing performance, product and application thereof - Google Patents
Preparation method of super-hydrophobic poplar with self-repairing performance, product and application thereof Download PDFInfo
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- CN115179378B CN115179378B CN202210518292.2A CN202210518292A CN115179378B CN 115179378 B CN115179378 B CN 115179378B CN 202210518292 A CN202210518292 A CN 202210518292A CN 115179378 B CN115179378 B CN 115179378B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/0207—Pretreatment of wood before impregnation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/0207—Pretreatment of wood before impregnation
- B27K3/0214—Drying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/02—Processes; Apparatus
- B27K3/0228—Spraying apparatus, e.g. tunnels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/34—Organic impregnating agents
- B27K3/50—Mixtures of different organic impregnating agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/003—Treating of wood not provided for in groups B27K1/00, B27K3/00 by using electromagnetic radiation or mechanical waves
- B27K5/0055—Radio-waves, e.g. microwaves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/04—Combined bleaching or impregnating and drying of wood
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Abstract
The application discloses a preparation method of super-hydrophobic poplar with self-repairing performance, a product and application thereof, and the application develops a simple and efficient preparation method of the self-repairing super-hydrophobic poplar, and microcapsules coating low surface energy materials are introduced, so that the coating can recover a coarse structure and supplement low surface energy substances to realize self-repairing of the super-hydrophobic performance; the micro/nano coarse structure is provided by nano zinc oxide, and the stearic acid provides certain low surface energy, so that the coating has excellent waterproof, stain-resistant and self-cleaning properties; the super-hydrophobic coating with the self-repairing function is beneficial to promoting the long-term utilization of the super-hydrophobic wood indoors and outdoors and the utilization of the super-hydrophobic wood in a complex high-humidity environment.
Description
Technical Field
The application belongs to the technical field of novel wood development and modification, and particularly relates to a preparation method of super-hydrophobic poplar with self-repairing performance, a product and application thereof.
Background
The super-hydrophobic surface has lower surface energy and capillary adhesion, so that water drops can freely roll on the super-hydrophobic surface, and the migration efficiency is higher. Although superhydrophobic surfaces have significant non-wetting characteristics, the durability of superhydrophobic surfaces is a key issue in achieving their large-scale application. When superhydrophobic surfaces are subjected to mechanical abrasion or prolonged exposure to ultraviolet radiation, various solvents, bacteria, etc., the roughness characteristics and low surface energy of the surfaces are destroyed, resulting in a decrease in the hydrophobicity of the solid surface. Thus, the practical application of superhydrophobic surfaces depends not only on their wettability, but also on their ability to resist erosion and abrasion over a period of time.
The self-repairing function has great significance for enhancing the durability of the super-hydrophobic coating, and the self-repairing coating with super-hydrophobic performance has the capability of resisting water, water electrolyte and biological corrosion. Methods to date to improve the durability of superhydrophobic surfaces include enhancing mechanical stability, improving corrosion resistance, and the like.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The application provides a preparation method of super-hydrophobic poplar with self-repairing performance, which comprises the following steps:
(1) Cleaning poplar and drying;
(2) Preparing 20-30% aqueous dispersion of polytetrafluoroethylene, adding vinyl triethoxysilane, stirring uniformly, adding sodium dodecyl benzene sulfonate, stirring and reacting for 6-7 h to obtain microcapsule emulsion, and drying to obtain microcapsule powder;
(3) Preparing a water-based acrylic resin aqueous solution with the mass fraction of 50%, adding zinc oxide nanoparticles and microcapsule powder, and stirring to obtain a coating dispersion system;
(4) Spraying the coating dispersion system on the surface of poplar, and then irradiating the poplar treated in the step (3) for 3-4 min under an ultraviolet lamp, wherein the vertical irradiation distance is 15-25 cm, so that the coating is cured;
(5) Preparing an ethanol solution of stearic acid with the concentration of 4-5 wt%, adding acetic acid for acidification, fully soaking the poplar treated in the step (4) for 3-4 min, and drying to obtain the super-hydrophobic poplar with self-repairing performance.
As a preferable scheme of the preparation method of the super-hydrophobic poplar with the self-repairing property, the application has the following advantages: and (2) selecting poplar samples with the sizes of 20mm and 2mm, respectively ultrasonically cleaning the poplar samples in absolute ethyl alcohol and distilled water for 30min, and drying the poplar samples in an electrothermal constant-temperature blast drying oven at 120 ℃.
As a preferable scheme of the preparation method of the super-hydrophobic poplar with the self-repairing property, the application has the following advantages: preparing 24g of polytetrafluoroethylene aqueous dispersion with the mass fraction of 25%, carrying out ultrasonic treatment for 30min, adding 4.5g of vinyl triethoxysilane, stirring uniformly, adding 100mL of deionized water and 1.7g of sodium dodecyl benzene sulfonate, carrying out ultrasonic treatment in an ultrasonic cytoclasis instrument for 10min, then carrying out stirring reaction at the temperature of 30 ℃ for 6h, obtaining microcapsule emulsion, and carrying out suction filtration and drying on the obtained product to obtain microcapsule powder.
As a preferable scheme of the preparation method of the super-hydrophobic poplar with the self-repairing property, the application has the following advantages: and (3) preparing 10g of aqueous acrylic resin with the mass fraction of 50% by taking deionized water as a solvent, adding 7.5g of zinc oxide nano particles and 4.5g of microcapsule powder, and magnetically stirring for 1h to obtain a coating dispersion system.
As a preferable scheme of the preparation method of the super-hydrophobic poplar with the self-repairing property, the application has the following advantages: the aqueous acrylic resin is binary mixed resin of polyurethane acrylic ester and epoxy acrylic ester, and the mass ratio of the polyurethane acrylic ester to the epoxy acrylic ester is 1:1.
as a preferable scheme of the preparation method of the super-hydrophobic poplar with the self-repairing property, the application has the following advantages: and (4) spraying the coating dispersion system on the surface of the poplar by using a high-voltage electric spraying machine, and irradiating the poplar treated in the step (3) for 3-4 min under an ultraviolet lamp, wherein the power of the ultraviolet lamp is 3kw, and the vertical irradiation distance is 20cm, so that the coating is cured.
As a preferable scheme of the preparation method of the super-hydrophobic poplar with the self-repairing property, the application has the following advantages: preparing 30ml of ethanol solution of stearic acid with the concentration of 4wt%, adding 3ml of acetic acid, performing ultrasonic treatment, cooling to room temperature, fully soaking the poplar treated in the step (4) for 3.5-4 min, and drying to obtain the super-hydrophobic poplar with self-repairing performance.
As a preferable scheme of the preparation method of the super-hydrophobic poplar with the self-repairing property, the application has the following advantages: the drying is carried out for 12-14 h at 20-25 ℃.
As another aspect of the application, the application also provides the super-hydrophobic poplar with self-repairing performance obtained by the preparation method.
As another aspect of the application, the application also provides the application of the poplar obtained by the preparation method in preparing poplar furniture with self-repairing super-hydrophobic performance.
The application has the beneficial effects that: the application develops a simple and efficient method for preparing the self-repairing super-hydrophobic poplar, and the microcapsule coating the low-surface-energy material is introduced, so that the coating can recover a coarse structure and supplement low-surface-energy substances to realize the self-repairing of the super-hydrophobic property; the micro/nano coarse structure is provided by nano zinc oxide, and the stearic acid provides certain low surface energy, so that the coating has excellent waterproof, stain-resistant and self-cleaning properties; the super-hydrophobic coating with the self-repairing function is beneficial to promoting the long-term utilization of the super-hydrophobic wood indoors and outdoors and the utilization of the super-hydrophobic wood in a complex high-humidity environment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a photograph of the product of example 1.
FIG. 2 is a process flow diagram of the present application.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will become more apparent, a more particular description of the application will be rendered by reference to specific embodiments thereof.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1:
(1): selecting poplar samples with the sizes of 20 mm-2 mm, respectively ultrasonically cleaning the poplar samples in absolute ethyl alcohol and distilled water for 30min, and drying the treated poplar in an electrothermal constant-temperature blast drying oven at 120 ℃.
(2): preparing 24g of aqueous dispersion of polytetrafluoroethylene (model 30XL of Dongguan Limited of fluorine-containing coating) with mass fraction of 25%, performing ultrasonic treatment for 30min, adding 4.5g of vinyltriethoxysilane, uniformly stirring by using a glass cup, adding 100mL of deionized water and 1.7g of sodium dodecyl benzene sulfonate, performing ultrasonic treatment in an ultrasonic cytoclasis instrument for 10min, performing open stirring reaction in a constant-temperature magnetic stirrer at 30 ℃ for 6h, obtaining microcapsule emulsion, and performing suction filtration and drying on the obtained product to obtain microcapsule powder.
(3): preparing 10g of 50% aqueous acrylic resin aqueous solution (product number A185721006, huzhou large-week polymer material Co., ltd.) by taking deionized water as a solvent, adding 7.5g of zinc oxide nano particles (average particle size 15 nm) and 4g of microcapsule powder into a beaker, and magnetically stirring the mixed solution for 1h by adopting a constant-temperature heating magnetic stirrer to obtain a coating dispersion system;
(4): spraying the coating dispersion system on the surface of poplar by using a high-voltage electric spraying machine, irradiating the culture dish filled with the wood sample treated in the step (3) for 4min under an ultraviolet lamp with the power of 3kw and the vertical irradiation distance of 20cm, and curing the coating;
(5) Preparing 30ml of ethanol solution of stearic acid with the concentration of 4wt%, adding 3ml of acetic acid for acidification, carrying out ultrasonic treatment on the mixed solution in an ultrasonic crusher, cooling to room temperature, fully soaking the coated poplar in the ethanol solution of stearic acid for 3.5min, and drying at 25 ℃ for 12h to obtain the super-hydrophobic poplar with self-repairing property.
Through tests, the water contact angle of the self-repairing super-hydrophobic wood prepared by the embodiment is 160.8 degrees, and the self-repairing coating can recover super-hydrophobic performance after being immersed in NaCl solution with mass fraction of 5% for 500 hours.
Example 2:
(1): selecting poplar samples with the sizes of 20 mm-2 mm, respectively ultrasonically cleaning the poplar samples in absolute ethyl alcohol and distilled water for 30min, and drying the treated poplar in an electrothermal constant-temperature blast drying oven at 120 ℃ to an absolute dry state.
(2): preparing 24g of aqueous dispersion of polytetrafluoroethylene emulsion with mass fraction of 25%, carrying out ultrasonic treatment for 30min, adding 4.5g of vinyl triethoxysilane, uniformly stirring by using a glass cup, adding 100mL of deionized water and 1.7g of sodium dodecyl benzene sulfonate, carrying out ultrasonic treatment in an ultrasonic cytoclasis instrument for 10min, then carrying out open stirring reaction in a constant-temperature magnetic stirrer at 30 ℃ for 6h, obtaining microcapsule emulsion, carrying out suction filtration and drying on the obtained product, and obtaining microcapsule powder.
(3): preparing 10g of aqueous acrylic resin with the mass fraction of 50% by taking deionized water as a solvent, adding 7.5g of zinc oxide nano particles and 4g of microcapsule powder into a beaker, and magnetically stirring the mixed solution for 1h by adopting a constant-temperature heating magnetic stirrer to obtain a coating dispersion system;
(4): spraying the coating dispersion system on the surface of poplar by using a high-voltage electric spraying machine, irradiating the culture dish filled with the wood sample treated in the step (3) for 3min under an ultraviolet lamp with the power of 3kw and the vertical irradiation distance of 20cm, and curing the coating;
(5) Preparing 30ml of ethanol solution of stearic acid with the concentration of 4wt%, adding 3ml of acetic acid for acidification, carrying out ultrasonic treatment on the mixed solution in an ultrasonic crusher, cooling to room temperature, fully soaking the coated poplar in the ethanol solution of stearic acid for 3.5min, and drying at 25 ℃ for 12h to obtain the super-hydrophobic poplar with self-repairing property.
Through tests, the water contact angle of the self-repairing super-hydrophobic wood prepared by the embodiment is 160.1 degrees, and the self-repairing coating can recover super-hydrophobic performance after being immersed in NaCl solution with mass fraction of 5% for 500 hours.
Example 3:
(1): selecting poplar samples with the sizes of 20 mm-2 mm, respectively ultrasonically cleaning the poplar samples in absolute ethyl alcohol and distilled water for 30min, and drying the treated poplar in an electrothermal constant-temperature blast drying oven at 120 ℃ to an absolute dry state.
(2): preparing 24g of aqueous dispersion of polytetrafluoroethylene emulsion with mass fraction of 25%, carrying out ultrasonic treatment for 30min, adding 4.5g of vinyl triethoxysilane, uniformly stirring by using a glass cup, adding 100mL of deionized water and 1.7g of sodium dodecyl benzene sulfonate, carrying out ultrasonic treatment in an ultrasonic cytoclasis instrument for 10min, then carrying out open stirring reaction in a constant-temperature magnetic stirrer at 30 ℃ for 6h, obtaining microcapsule emulsion, carrying out suction filtration and drying on the obtained product, and obtaining microcapsule powder.
(3): preparing 10g of aqueous acrylic resin with the mass fraction of 50% by taking deionized water as a solvent, adding 7.5g of zinc oxide nano particles and 4.5g of microcapsule powder into a beaker, and magnetically stirring the mixed solution for 1h by adopting a constant-temperature heating magnetic stirrer to obtain a coating dispersion system;
(4): spraying the coating dispersion system on the surface of poplar by using a high-voltage electric spraying machine, irradiating the culture dish filled with the wood sample treated in the step (3) for 3min under an ultraviolet lamp with the power of 3kw and the vertical irradiation distance of 20cm, and curing the coating;
(5) Preparing 30ml of ethanol solution of stearic acid with the concentration of 4wt%, adding 3ml of acetic acid for acidification, carrying out ultrasonic treatment on the mixed solution in an ultrasonic crusher, cooling to room temperature, fully soaking the coated poplar in the ethanol solution of stearic acid for 3.5min, and drying at 25 ℃ for 12h to obtain the super-hydrophobic poplar with self-repairing property.
Through tests, the water contact angle of the self-repairing super-hydrophobic wood prepared by the embodiment is 162.2 degrees, and the self-repairing coating can recover super-hydrophobic performance after being immersed in NaCl solution with mass fraction of 5% for 500 hours.
Example 4:
(1): selecting poplar samples with the sizes of 20 mm-2 mm, respectively ultrasonically cleaning the poplar samples in absolute ethyl alcohol and distilled water for 30min, and drying the treated poplar in an electrothermal constant-temperature blast drying oven at 120 ℃ to an absolute dry state.
(2): preparing 24g of aqueous dispersion of polytetrafluoroethylene emulsion with mass fraction of 25%, carrying out ultrasonic treatment for 30min, adding 4.5g of vinyl triethoxysilane, uniformly stirring by using a glass cup, adding 100mL of deionized water and 1.7g of sodium dodecyl benzene sulfonate, carrying out ultrasonic treatment in an ultrasonic cytoclasis instrument for 10min, then carrying out open stirring reaction in a constant-temperature magnetic stirrer at 30 ℃ for 6h, obtaining microcapsule emulsion, carrying out suction filtration and drying on the obtained product, and obtaining microcapsule powder.
(3): preparing 10g of aqueous acrylic resin with the mass fraction of 50% by taking deionized water as a solvent, adding 7.5g of zinc oxide nano particles and 4.5g of microcapsule powder into a beaker, and magnetically stirring the mixed solution for 1h by adopting a constant-temperature heating magnetic stirrer to obtain a coating dispersion system;
(4): spraying the coating dispersion system on the surface of poplar by using a high-voltage electric spraying machine, irradiating the culture dish filled with the wood sample treated in the step (3) for 4min under an ultraviolet lamp with the power of 3kw and the vertical irradiation distance of 20cm, and curing the coating;
(5) Preparing 30ml of ethanol solution of stearic acid with the concentration of 4wt%, adding 3ml of acetic acid for acidification, carrying out ultrasonic treatment on the mixed solution in an ultrasonic crusher, cooling to room temperature, fully soaking the coated poplar in the ethanol solution of stearic acid for 4min, and drying at 25 ℃ for 12h to obtain the super-hydrophobic poplar with self-repairing performance.
Through tests, the water contact angle of the self-repairing super-hydrophobic wood prepared by the embodiment is 159.5 degrees, and the self-repairing coating can recover super-hydrophobic performance after being immersed in NaCl solution with mass fraction of 5% for 500 hours.
Example 5:
(1): selecting poplar samples with the sizes of 20 mm-2 mm, respectively ultrasonically cleaning the poplar samples in absolute ethyl alcohol and distilled water for 30min, and drying the treated poplar in an electrothermal constant-temperature blast drying oven at 120 ℃ to an absolute dry state.
(2): preparing 24g of aqueous dispersion of polytetrafluoroethylene emulsion with mass fraction of 25%, carrying out ultrasonic treatment for 30min, adding 4.5g of vinyl triethoxysilane, uniformly stirring by using a glass cup, adding 100mL of deionized water and 1.7g of sodium dodecyl benzene sulfonate, carrying out ultrasonic treatment in an ultrasonic cytoclasis instrument for 10min, then carrying out open stirring reaction in a constant-temperature magnetic stirrer at 30 ℃ for 6h, obtaining microcapsule emulsion, carrying out suction filtration and drying on the obtained product, and obtaining microcapsule powder.
(3): preparing 10g of aqueous acrylic resin with the mass fraction of 50% by taking deionized water as a solvent, adding 7.5g of zinc oxide nano particles and 4.5g of microcapsule powder into a beaker, and magnetically stirring the mixed solution for 1h by adopting a constant-temperature heating magnetic stirrer to obtain a coating dispersion system;
(4): spraying the coating dispersion system on the surface of poplar by using a high-voltage electric spraying machine, irradiating the culture dish filled with the wood sample treated in the step (3) for 4min under an ultraviolet lamp with the power of 3kw and the vertical irradiation distance of 20cm, and curing the coating;
(5) Preparing 30ml of ethanol solution of stearic acid with the concentration of 4wt%, adding 3ml of acetic acid for acidification, carrying out ultrasonic treatment on the mixed solution in an ultrasonic crusher, cooling to room temperature, fully soaking the coated poplar in the ethanol solution of stearic acid for 3.5min, and drying at 25 ℃ for 12h to obtain the super-hydrophobic poplar with self-repairing property.
Through tests, the water contact angle of the self-repairing super-hydrophobic wood prepared by the embodiment is 160.7 degrees, and the self-repairing coating can recover super-hydrophobic performance after being immersed in NaCl solution with mass fraction of 5% for 500 hours.
Performance testing
The coatings of examples 1 to 5 were tested for water contact angle, gloss (GB/T4893.6-2013), film abrasion resistance (GB/T4893.8-2013), impact resistance (GB/T4893.9-2013), and coating self-healing efficiency, respectively, and compared with commercially available conventional aqueous acrylic coatings without microcapsules added, and the test results are shown in the following table:
the method for calculating the coating hydrophobicity repair efficiency comprises the following steps: water contact angle after 500h immersion in 5% NaCl solution/water contact angle before immersion 100%.
Comparative example 1:
in example 1, step (2) was modified as follows: preparing 24g of polytetrafluoroethylene emulsion with the mass fraction of 25%, dispersing the polytetrafluoroethylene emulsion in deionized water, performing ultrasonic treatment for 30min, adding 3g of vinyltriethoxysilane, uniformly stirring by using a glass cup, adding 100mL of deionized water and 1g of sodium dodecyl benzene sulfonate, performing ultrasonic treatment in an ultrasonic cytoclasis instrument for 10min, and performing open stirring reaction in a constant-temperature magnetic stirrer at the temperature of 30 ℃ for 6h to obtain the microcapsule emulsion.
Other preparation methods were the same as in example 1.
The water contact angle of the self-repairing super-hydrophobic wood prepared in the embodiment is 157.1 degrees, and the self-repairing performance is 82.5 percent. The microcapsules cannot cover enough vinyltriethoxysilane due to the low content of emulsifier and vinyltriethoxysilane, so that the self-repairing performance of the coating is reduced.
Comparative example 2:
in example 1, step (3) was modified as: preparing 10g of aqueous acrylic resin with the mass fraction of 50% by taking deionized water as a solvent, adding 6g of zinc oxide nano particles and 4.5g of microcapsule powder into a beaker, and magnetically stirring the mixed solution for 1h by adopting a constant-temperature heating magnetic stirrer to obtain a coating dispersion system.
Other preparation methods were the same as in example 1.
The water contact angle of the self-repairing super-hydrophobic wood prepared in the embodiment is 154.9 degrees, and the self-repairing performance is 89.1 percent.
Comparative example 3:
in example 1, step (3) was modified as: preparing 10g of aqueous acrylic resin with the mass fraction of 50% by taking deionized water as a solvent, adding 7.5g of titanium dioxide nano particles and 4.5g of microcapsule powder into a beaker, and magnetically stirring the mixed solution for 1h by adopting a constant-temperature heating magnetic stirrer to obtain a coating dispersion system.
Other preparation methods were the same as in example 1.
The water contact angle of the self-repairing super-hydrophobic wood prepared in the embodiment is 143.5 degrees, and the self-repairing performance is 88.9 percent. Experimental results show that the repairing effect is obviously inferior to that of zinc oxide after titanium dioxide is adopted. Probably because titanium dioxide has poor dispersibility in the coating system of the application, a sufficient micro-nano coarse structure cannot be constructed on the surface of the coating.
Comparative example 4:
in example 1, step (5) was modified as follows: preparing 30ml of ethanol solution of hexadecyl trimethoxy with the concentration of 4wt%, carrying out ultrasonic treatment on the mixed solution in an ultrasonic crusher, cooling to room temperature, fully soaking the coated poplar in the ethanol solution of hexadecyl trimethoxy silane for 3.5min, and drying at 25 ℃ for 12h to obtain the super-hydrophobic poplar with self-repairing property.
Other preparation methods were the same as in example 1.
The water contact angle of the self-repairing super-hydrophobic wood prepared in the embodiment is 137.8 degrees, and the self-repairing performance is 81.7 percent.
Comparative example 5:
in example 1, step (5) was modified as follows: preparing 30ml of ethanol solution of stearic acid with the concentration of 2wt%, adding 3ml of acetic acid for acidification, carrying out ultrasonic treatment on the mixed solution in an ultrasonic crusher, cooling to room temperature, fully soaking the coated poplar in the ethanol solution of stearic acid for 3.5min, and drying at 25 ℃ for 12h to obtain the super-hydrophobic poplar with self-repairing property.
Other preparation methods were the same as in example 1.
The water contact angle of the self-repairing super-hydrophobic wood prepared in the embodiment is 150.1 degrees, and the self-repairing performance is 83.4 percent. The hydrophobic properties of the coating are reduced because the stearic acid concentration is low and the entire zinc oxide on the surface of the coating cannot be completely modified.
Comparative example 6:
in example 1, step (3) was modified as: preparing 10g of aqueous acrylic resin aqueous solution (product number A185721006, huzhou large-week high polymer material Co., ltd.) with deionized water as a solvent, adding 10g of zinc oxide nanoparticles (average particle size 15 nm) and 4g of microcapsule powder into a beaker, and magnetically stirring the mixed solution for 1h by adopting a constant-temperature heating magnetic stirrer to obtain a coating dispersion system.
Other preparation methods were the same as in example 1.
The water contact angle of the self-repairing super-hydrophobic wood prepared in the embodiment is 139.4 degrees, and the self-repairing performance is 87.9 percent. Higher zinc oxide content causes stacking of surface particles, resulting in reduced hydrophobic properties of the coating.
Comparative example 7: in example 1, step (3) was modified as: preparing 10g of 50% aqueous acrylic resin aqueous solution (product number A185721006, huzhou large-week polymer material Co., ltd.) by taking deionized water as a solvent, adding 7.5g of zinc oxide nano particles (average particle size 15 nm) and 11g of microcapsule powder into a beaker, and magnetically stirring the mixed solution for 1h by adopting a constant-temperature heating magnetic stirrer to obtain a coating dispersion system.
Other preparation methods were the same as in example 1.
The water contact angle of the self-repairing super-hydrophobic wood prepared in the embodiment is 153.1 degrees, and the self-repairing performance is 84.1 percent. The ratio of zinc oxide to microcapsules decreases, resulting in a decrease in hydrophobic and self-healing properties.
Comparative example 8: in example 1, step (5) was modified as follows: preparing 30ml of ethanol solution of stearic acid with the concentration of 6wt%, adding 3ml of acetic acid for acidification, carrying out ultrasonic treatment on the mixed solution in an ultrasonic crusher, cooling to room temperature, fully soaking the coated poplar in the ethanol solution of stearic acid for 3.5min, and drying at 25 ℃ for 12h to obtain the super-hydrophobic poplar with self-repairing property.
Other preparation methods were the same as in example 1.
The water contact angle of the self-repairing super-hydrophobic wood prepared in the embodiment is 155.7 degrees, and the self-repairing performance is 91.1 percent. The stearic acid concentration is higher, and the low surface energy substances generated on the surface are filled in the grooves of the micro-nano coarse structure, so that the hydrophobic performance is reduced.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered in the scope of the claims of the present application.
Claims (7)
1. A preparation method of super-hydrophobic poplar with self-repairing performance is characterized by comprising the following steps: the method comprises the following steps:
(1) Cleaning poplar and drying;
(2) Preparing 24-g mass percent of polytetrafluoroethylene aqueous dispersion, carrying out ultrasonic treatment for 30min, adding 4.5-g vinyl triethoxysilane, uniformly stirring, adding 100-mL deionized water and 1.7-g sodium dodecyl benzene sulfonate, carrying out ultrasonic treatment in an ultrasonic cell disruption instrument for 10min, stirring at 30 ℃ for reaction for 6-h to obtain microcapsule emulsion, and carrying out suction filtration and drying on the obtained product to obtain microcapsule powder;
(3) Preparing aqueous acrylic resin with the mass fraction of 10. 10g by taking deionized water as a solvent, adding zinc oxide nano particles of 7.5g and microcapsule powder of 4.5g, and magnetically stirring for 1.1 h to obtain a coating dispersion system;
the aqueous acrylic resin is binary mixed resin of polyurethane acrylic ester and epoxy acrylic ester, and the mass ratio of the polyurethane acrylic ester to the epoxy acrylic ester is 1:1, a step of;
(4) Spraying the coating dispersion system on the surface of poplar, and then irradiating the poplar treated in the step (3) for 3-4 min under an ultraviolet lamp, wherein the vertical irradiation distance is 15-25 cm, so that the coating is cured;
(5) Preparing an ethanol solution of stearic acid with the concentration of 4-5 wt%, adding acetic acid for acidification, fully soaking the poplar treated in the step (4) for 3-4 min, and drying to obtain the super-hydrophobic poplar with self-repairing performance.
2. The method for preparing the super-hydrophobic poplar with self-repairing property according to claim 1, which is characterized in that: and (2) selecting poplar samples with the sizes of 20mm multiplied by 20 multiplied by mm multiplied by 2mm, respectively ultrasonically cleaning the poplar samples in absolute ethyl alcohol and distilled water for 30min, and drying the poplar samples in an electrothermal constant-temperature blast drying oven at 120 ℃.
3. The method for preparing the super-hydrophobic poplar with self-repairing property according to claim 1, which is characterized in that: and (4) spraying the coating dispersion system on the surface of the poplar by using a high-voltage electric spraying machine, and irradiating the poplar treated in the step (3) for 3-4 min under an ultraviolet lamp, wherein the power of the ultraviolet lamp is 3kW, and the vertical irradiation distance is 20cm, so that the coating is cured.
4. The method for preparing the super-hydrophobic poplar with self-repairing property according to claim 1 or 2, which is characterized in that: and (5) preparing an ethanol solution of stearic acid with the concentration of 30mL being 4wt%, adding 3mL acetic acid, performing ultrasonic treatment, cooling to room temperature, fully soaking the poplar treated in the step (4) for 3.5-4 min, and drying to obtain the super-hydrophobic poplar with self-repairing performance.
5. The method for preparing the super-hydrophobic poplar with self-repairing property according to claim 4, which is characterized in that: and drying for 12-14 hours at 20-25 ℃.
6. The super-hydrophobic poplar with self-repairing property obtained by the preparation method of claim 1.
7. The method of claim 1, wherein the poplar is used for preparing poplar furniture with self-repairing super-hydrophobic property.
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| CN105885679A (en) * | 2016-06-07 | 2016-08-24 | 江南大学 | Self-repairing water-based super-hydrophobic coating based on microcapsule type and preparing method thereof |
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| Title |
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| 郑燕升 ; 何易 ; 青勇权 ; 卓志昊 ; 莫倩 ; .SiO_2/聚四氟乙烯杂化超疏水涂层的制备.化工进展.2012,(07),第1522-1566页. * |
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