Method of forming protective film on substrate

Abstract

The invention discloses a method for forming a protective film on a base material. The method comprises the following steps: preparing an antibacterial nano-composite liquid: preparing the antibacterial nano-composite liquid from antibacterial nano-particles and a polymer according to a preset ratio; pouring and coating the antibacterial nano composite liquid on the surface of a base material; and carrying out light curing on the antibacterial nano-composite liquid to form the protective film. The method is simple in process and high in controllability, and the formed protective film has excellent antibacterial performance, wear resistance, weather resistance and corrosion resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of material processing, and in particular to a method for forming a protective film on a substrate. BACKGROUND

[0002] In some industries, the demand for antibacterial materials is growing, for example, for medical devices, the surface of which requires high antibacterial requirements to prevent bacterial infection; for food packaging, whether the surface of which is antibacterial directly affects food preservation and shelf life; for electronic products, the surface of which needs to have the ability to inhibit bacterial growth; for public facilities, the surface of which needs to reduce the possibility of bacterial transmission.

[0003] Therefore, how to improve the antibacterial property of the substrate is an important issue at present. It is necessary to provide a method for forming a protective film on a substrate to solve the problem. SUMMARY

[0004] The purpose of the present application is to provide a method for forming a protective film on a substrate, which is simple in process and strong in controllability, and the protective film formed has excellent antibacterial property, wear resistance, weather resistance and corrosion resistance.

[0005] To achieve the above-mentioned purpose, the method for forming a protective film on a substrate of the present application comprises the following steps:

[0006] Preparation of antibacterial nanocomposite liquid: the antibacterial nanoparticles and the polymer are prepared into the antibacterial nanocomposite liquid according to the predetermined ratio;

[0007] Pouring the antibacterial nanocomposite liquid on the surface of the substrate; and

[0008] Forming a protective film by photocuring the antibacterial nanocomposite liquid.

[0009] Compared with the prior art, the preparation method of the present application forms a protective film on the surface of the substrate by preparing a specific antibacterial nanocomposite liquid and pouring and photocuring the composite liquid, the antibacterial nanoparticles in the protective film have strong antibacterial activity and can effectively kill a variety of bacteria; moreover, the antibacterial nanoparticles are uniformly dispersed in the polymer matrix, ensuring good light transmittance of the protective film; the protective film formed by photocuring has good wear resistance, weather resistance and corrosion resistance. The method is suitable for various substrates and can be widely used in medical, food, electronic and other fields.

[0010] As an embodiment, the step of preparing the antibacterial nanocomposite liquid comprises dispersing the antibacterial nanoparticles in an organic solvent to form a nanoparticle dispersion.

[0011] As an embodiment, the step of preparing the antibacterial nanocomposite liquid further comprises dissolving the polymer in an organic solvent to form a polymer solution.

[0012] As an example, the step of preparing the antibacterial nanocomposite liquid further includes: mixing and stirring the nanoparticle dispersion with the polymer solution to form the antibacterial nanocomposite liquid.

[0013] As one embodiment, the antibacterial nanoparticles include silver nanoparticles and / or titanium dioxide nanoparticles.

[0014] As one example, the antibacterial nanocomposite liquid is coated on the surface of the substrate with a thickness of 100-150 micrometers.

[0015] As an example, the light curing is ultraviolet light curing.

[0016] As an example, the polymer is polyurethane and / or polyvinyl alcohol.

[0017] As an example, the organic solvent is ethanol and / or dichloromethane. Detailed Implementation

[0018] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific implementation methods of this application are described in detail below with reference to some embodiments. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0019] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0021] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] The method for forming a protective film on a substrate according to the present invention will be further described below with reference to embodiments, but this does not limit the present invention. The method of the present invention aims to provide a method for forming a protective film on a substrate, which is simple in process, highly controllable, and the formed protective film has excellent antibacterial properties, wear resistance, weather resistance, and corrosion resistance.

[0023] An embodiment of the method for forming a protective film on a substrate according to the present invention includes the following steps:

[0024] Preparation of antibacterial nanocomposite liquid: The antibacterial nanocomposite liquid is prepared by mixing antibacterial nanoparticles and polymers in a predetermined ratio;

[0025] The antibacterial nanocomposite liquid was cast onto the surface of the substrate; and

[0026] The antibacterial nanocomposite liquid is photocured to form a protective film.

[0027] The preparation method of this invention involves preparing a specific antibacterial nanocomposite liquid and then using composite liquid casting and photocuring technology to form a protective film on the surface of a substrate. The antibacterial nanoparticles in this protective film possess strong antibacterial activity, effectively killing various bacteria. Furthermore, the antibacterial nanoparticles are uniformly dispersed in the polymer matrix, ensuring good light transmittance of the protective film. The photocured protective film exhibits excellent wear resistance and corrosion resistance. This method is applicable to various substrates and can be widely used in medical, food, and electronic fields.

[0028] In this invention, the substrate includes, but is not limited to, glass, plastic, metal, etc.

[0029] In a specific embodiment, the steps for preparing the antibacterial nanocomposite liquid are as follows.

[0030] First, a nanoparticle dispersion is prepared: antibacterial nanoparticles (such as silver nanoparticles and / or titanium dioxide nanoparticles) are dispersed in an organic solvent to form a nanoparticle dispersion. The concentration and particle size of the nanoparticles can be optimized according to the desired antibacterial properties and the transparency of the protective film. In one embodiment, the organic solvent is ethanol.

[0031] Next, a polymer solution is prepared: a polymer with good film-forming properties and transparency (such as polyurethane and / or polyvinyl alcohol) is selected and dissolved in an organic solvent to form a polymer solution. The concentration and type of polymer are selected based on the mechanical strength, adhesion, and weather resistance of the protective film. In one embodiment, the organic solvent is dichloromethane.

[0032] Next, the nanoparticle dispersion is mixed with the polymer solution: the nanoparticle dispersion and polymer solution are mixed in a certain proportion and stirred evenly to form an antibacterial nanocomposite solution. The mixing ratio is adjusted according to the desired antibacterial properties and the transparency of the protective film.

[0033] It should be noted that the steps for preparing the nanoparticle dispersion and the polymer solution are not in any particular order.

[0034] After preparing the antibacterial nanocomposite liquid, a casting process is performed. Specifically, the antibacterial nanocomposite liquid is uniformly cast onto the surface of a substrate. The casting thickness is controlled according to the abrasion resistance and light transmittance of the protective film. Preferably, the thickness of the antibacterial nanocomposite liquid cast onto the surface of the substrate is 100-150 micrometers.

[0035] Next, the coated substrate is placed under a UV light source for photocuring, causing the antibacterial nanocomposite liquid to solidify and form a protective film. The UV irradiation time and intensity are adjusted according to the curing characteristics of the polymer. Specifically, after UV curing, the polymer in the antibacterial nanocomposite liquid undergoes a cross-linking reaction, forming a dense antibacterial protective film. The thickness, transparency, and antibacterial properties of the protective film can be controlled by adjusting the nanoparticle concentration, polymer type, and process parameters.

[0036] The antibacterial nanoparticles in this protective film have strong antibacterial activity and can effectively kill a variety of bacteria. Moreover, the antibacterial nanoparticles are uniformly dispersed in the polymer matrix, ensuring good light transmittance of the protective film. The protective film formed by photocuring has good wear resistance, weather resistance and corrosion resistance.

[0037] In a specific embodiment, 1-3 grams of silver nanoparticles are dispersed in 50-100 ml of ethanol and ultrasonically treated for 30-60 minutes to form a silver nanoparticle dispersion. 5-8 grams of polyurethane are dissolved in 50-100 ml of dichloromethane and stirred until homogeneous to form a polyurethane solution. The silver nanoparticle dispersion and polyurethane solution are mixed at a 1:1 volume ratio and stirred until homogeneous to form an antibacterial nanocomposite liquid. The antibacterial nanocomposite liquid is uniformly cast onto a glass substrate to a thickness of 100 micrometers. The cast substrate is then irradiated under an ultraviolet light source for 5-10 minutes for photocuring. After ultraviolet photocuring, a dense antibacterial protective film is formed. The protective film prepared in this embodiment exhibits good bactericidal effects against Escherichia coli and Staphylococcus aureus, with a bactericidal rate exceeding 99.9%. Furthermore, the protective film has a light transmittance greater than 90% and good wear resistance and weather resistance.

[0038] In summary, the preparation method of this invention involves preparing a specific antibacterial nanocomposite liquid and then using composite liquid casting and photocuring techniques to form a protective film on the surface of a substrate. The antibacterial nanoparticles in this protective film possess strong antibacterial activity, effectively killing various bacteria. Furthermore, the antibacterial nanoparticles are uniformly dispersed in the polymer matrix, ensuring good light transmittance of the protective film. The photocured protective film exhibits excellent wear resistance, weather resistance, and corrosion resistance. This method is applicable to various substrates and can be widely used in medical, food, and electronic fields.

[0039] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for forming a protective film on a substrate, wherein the method comprises the following steps: Preparation of antibacterial nanocomposite liquid: The antibacterial nanocomposite liquid is prepared by mixing antibacterial nanoparticles and polymers in a predetermined ratio; The antibacterial nanocomposite liquid was cast onto the surface of the substrate; and The antibacterial nanocomposite liquid is photocured to form a protective film.

2. The method for forming a protective film on a substrate as described in claim 1, characterized in that, The step of preparing the antibacterial nanocomposite liquid includes: dispersing the antibacterial nanoparticles in an organic solvent to form a nanoparticle dispersion.

3. The method for forming a protective film on a substrate as described in claim 2, characterized in that, The step of preparing the antibacterial nanocomposite liquid further includes: dissolving the polymer in an organic solvent to form a polymer solution.

4. The method for forming a protective film on a substrate as described in claim 3, characterized in that, The step of preparing the antibacterial nanocomposite liquid further includes: mixing and stirring the nanoparticle dispersion with the polymer solution to form the antibacterial nanocomposite liquid.

5. The method for forming a protective film on a substrate as described in claim 1, characterized in that, The antibacterial nanoparticles include silver nanoparticles and / or titanium dioxide nanoparticles.

6. The method for forming a protective film on a substrate as described in claim 1, characterized in that, The antibacterial nanocomposite liquid is coated on the surface of the substrate to a thickness of 100-150 micrometers.

7. The method for forming a protective film on a substrate as described in claim 1, characterized in that, The light curing is ultraviolet light curing.

8. The method for forming a protective film on a substrate as described in claim 1, characterized in that, The polymer is polyurethane and / or polyvinyl alcohol.

9. The method for forming a protective film on a substrate as described in claim 1, characterized in that, The organic solvent is ethanol and / or dichloromethane.