Washable antibacterial super-hydrophobic coating as well as preparation method and application thereof

Abstract

The invention discloses a washable antibacterial super-hydrophobic coating and a preparation method and application thereof.According to the method, hydrophobic interaction is utilized, after hydrophobic nano-particles form a compact hydrophobic particle film on the water surface, a drainage sedimentation technology is changed into a printing technology, namely, a base plate with a double-face bonding layer is vertically placed into water, then the base plate is rotated to the horizontal angle to be slowly lifted, and the base plate is subjected to water washing; and the particle film is attached to the double-sided bonding layer, heating is carried out to enhance the bonding force of the particle film and the double-sided bonding layer, and the super-hydrophobic coating is obtained. The preparation method takes water as a medium, does not need to use an organic solvent, and has the characteristics of simple process and environmental protection; the printing process can greatly simplify the process flow, reduce the production cost and is suitable for large-area preparation. The prepared super-hydrophobic coating has the advantages of good antibacterial performance, good super-hydrophobic performance, good underwater stability, washability, good flexibility and the like, has high practical value and good application prospects, and can be applied to the fields of medical treatment and public health, food industry, antifouling, environmental protection and the like.

Description

technical field

[0001] The invention relates to the technical field of super-hydrophobic coatings, in particular to a washable antibacterial super-hydrophobic coating and its preparation method and application. Background technique

[0002] Diseases caused by bacterial infections (such as cholera, scarlet fever, etc.) are still raging around the world, resulting in a strong demand for antimicrobial medical devices with environmental stability and reusable performance, especially in underdeveloped areas. Over the past decades, several active and passive antimicrobial surfaces based on antibiotics, silver nanoparticles, toxic materials, or superwetting structures have been developed. Inspired by the "lotus leaf effect", superhydrophobic materials are a new type of biomimetic materials with a superwetting structure. The contact angle between the surface and water is greater than 150° and the rolling angle is less than 10°. Due to the excellent waterproof and self-cleaning prop...

Examples

preparation example Construction

[0033] The present invention proposes a kind of preparation method of washable antibacterial superhydrophobic coating, comprises the following steps:

[0034] S1: Select the double-sided adhesive layer, weigh the hydrophobic nanoparticles according to the mass ratio of the adhesive layer to the hydrophobic nanoparticles (20-30): 1, place the hydrophobic nanoparticles in water, stir, let stand, and place them on the water surface A particle film is formed on it.

[0035] If the mass of hydrophobic nanoparticles is too small, a dense hydrophobic particle film cannot be formed on the water surface; if the mass is too large, they will accumulate on the water surface, resulting in waste of raw materials.

[0036] Preferably, the preparation process of the hydrophobic nanoparticles comprises:

[0037] S11: Weigh stearic acid, nanoparticles and organic solvent according to the mass ratio (0.08-0.16): 1:30, add stearic acid and nanoparticles to the organic solvent, and heat to underg...

Embodiment 1

[0058] The present embodiment provides a kind of preparation method of washable antibacterial superhydrophobic coating, such as figure 1 shown, including the following steps:

[0059] S1: Put filter paper in the Buchner funnel, then install the funnel in a conical flask with a vent; close the vent, pour 40°C water into the funnel, with a height of about 4cm; weigh 0.8g of hydrophobic oxidation Zinc particles, and the hydrophobic zinc oxide particles are placed on the water surface, stirred for a while with a glass rod, the hydrophobic zinc oxide particles will spread evenly on the water surface to form a tight particle film;

[0060] S2: Cut the "3M" VHB acrylic foam tape into sections, paste it on the glass substrate, and then put it into the water slightly vertically from the side of the funnel, and the side with the tape layer is slightly facing the water surface;

[0061] S3: Turn the substrate to a horizontal state and lift it up slowly, and the particle film is attached...

Embodiment 2

[0071] This example provides a method for preparing a washable antibacterial superhydrophobic coating. Compared with Example 1, in this example, the substrate is not used in step S2, and the "3M" VHB acrylic foam tape is directly used. After the preparation is completed Attach the superhydrophobic coating on the syringe barrel, and the other steps are the same as in Example 1.

[0072] The superhydrophobic coating that present embodiment prepares is characterized:

[0073] The average static contact angle of the superhydrophobic coating prepared in this example is 155.3°, the measured rolling angle is 1°, and the antibacterial rate can reach 99%.

[0074] Image 6 It is an optical photograph of the superhydrophobic coating made in this embodiment. It can be seen from the figure that the preparation method of the present invention can be used on adhesive tapes to make super-hydrophobic functional adhesive tapes and realize technological transformation.

[0075] Figure 7 It...

technical field

[0001] The invention relates to the technical field of super-hydrophobic coatings, in particular to a washable antibacterial super-hydrophobic coating and its preparation method and application. Background technique

[0002] Diseases caused by bacterial infections (such as cholera, scarlet fever, etc.) are still raging around the world, resulting in a strong demand for antimicrobial medical devices with environmental stability and reusable performance, especially in underdeveloped areas. Over the past decades, several active and passive antimicrobial surfaces based on antibiotics, silver nanoparticles, toxic materials, or superwetting structures have been developed. Inspired by the "lotus leaf effect", superhydrophobic materials are a new type of biomimetic materials with a superwetting structure. The contact angle between the surface and water is greater than 150° and the rolling angle is less than 10°. Due to the excellent waterproof and self-cleaning prop...

Examples

preparation example Construction

[0033] The present invention proposes a kind of preparation method of washable antibacterial superhydrophobic coating, comprises the following steps:

[0034] S1: Select the double-sided adhesive layer, weigh the hydrophobic nanoparticles according to the mass ratio of the adhesive layer to the hydrophobic nanoparticles (20-30): 1, place the hydrophobic nanoparticles in water, stir, let stand, and place them on the water surface A particle film is formed on it.

[0035] If the mass of hydrophobic nanoparticles is too small, a dense hydrophobic particle film cannot be formed on the water surface; if the mass is too large, they will accumulate on the water surface, resulting in waste of raw materials.

[0036] Preferably, the preparation process of the hydrophobic nanoparticles comprises:

[0037] S11: Weigh stearic acid, nanoparticles and organic solvent according to the mass ratio (0.08-0.16): 1:30, add stearic acid and nanoparticles to the organic solvent, and heat to underg...

Embodiment 1

[0058] The present embodiment provides a kind of preparation method of washable antibacterial superhydrophobic coating, such as figure 1 shown, including the following steps:

[0059] S1: Put filter paper in the Buchner funnel, then install the funnel in a conical flask with a vent; close the vent, pour 40°C water into the funnel, with a height of about 4cm; weigh 0.8g of hydrophobic oxidation Zinc particles, and the hydrophobic zinc oxide particles are placed on the water surface, stirred for a while with a glass rod, the hydrophobic zinc oxide particles will spread evenly on the water surface to form a tight particle film;

[0060] S2: Cut the "3M" VHB acrylic foam tape into sections, paste it on the glass substrate, and then put it into the water slightly vertically from the side of the funnel, and the side with the tape layer is slightly facing the water surface;

[0061] S3: Turn the substrate to a horizontal state and lift it up slowly, and the particle film is attached...

Embodiment 2

[0071] This example provides a method for preparing a washable antibacterial superhydrophobic coating. Compared with Example 1, in this example, the substrate is not used in step S2, and the "3M" VHB acrylic foam tape is directly used. After the preparation is completed Attach the superhydrophobic coating on the syringe barrel, and the other steps are the same as in Example 1.

[0072] The superhydrophobic coating that present embodiment prepares is characterized:

[0073] The average static contact angle of the superhydrophobic coating prepared in this example is 155.3°, the measured rolling angle is 1°, and the antibacterial rate can reach 99%.

[0074] Image 6 It is an optical photograph of the superhydrophobic coating made in this embodiment. It can be seen from the figure that the preparation method of the present invention can be used on adhesive tapes to make super-hydrophobic functional adhesive tapes and realize technological transformation.

[0075] Figure 7 It...

Images