Antibacterial bristle as well as preparation method and application thereof

Abstract

The invention discloses antibacterial bristles as well as a preparation method and application thereof. The preparation method of the antibacterial brush hair comprises the following steps: after the brush hair is subjected to oxygen plasma treatment, adding a chitosan solution and a cyanuric chloride solution, reacting under the conditions that the pH is 6-7 and the temperature is less than or equal to 15 DEG C, soaking in a quaternary ammonium salt solution, and drying to obtain the antibacterial brush hair. The antibacterial brush hair prepared by the method has excellent antibacterial property and lasting antibacterial effect, is wide in applicability and is easy for industrial production. The invention also provides the antibacterial brush hair prepared by adopting the method and application of the antibacterial brush hair.

Description

Technical Field

[0001] The invention relates to the technical field of fiber materials, and in particular to an antibacterial bristle and a preparation method and application thereof. Background Art

[0002] Makeup brushes are mainly composed of two parts: the handle and the bristles. Common types include loose powder brushes, blush brushes, eyebrow brushes, eyeshadow brushes, etc. Using the bristles to absorb powdered, paste-like or liquid cosmetics can control the amount of cosmetics used and help the cosmetics blend better with the skin. Because the bristles need to directly contact the hair, skin and other parts while absorbing cosmetics, they are prone to attaching sebum and dirt, causing bacteria and other microorganisms to breed. If there are bacteria, mold and other microorganisms on the makeup brush itself, it may cause skin problems or infections. Some studies have shown that uncleaned makeup brushes may be parasitic on a large number of bacteria and other microorganisms, which may include pathogens. Long-term use of such makeup brushes may cause skin problems, allergic reactions or infectious diseases.

[0003] In order to improve the safety and hygiene of makeup brushes, researchers are committed to developing makeup brushes with antibacterial functions. For example, by adding antibacterial agents to the makeup brush material to effectively reduce bacterial growth, thereby maintaining the hygiene of the makeup brush. Antibacterial agents include two major categories: metallic antibacterial agents and non-metallic antibacterial agents. Among them, antibacterial makeup brushes prepared with metallic antibacterial agents have stable, long-lasting and effective antibacterial properties, and are suitable for use in occasions with high requirements for sanitary environment. However, metallic antibacterial agents are prone to cause skin allergies in some people, and the bristles are hard and are not suitable for all skin types. Non-metallic antibacterial agents have little effect on the feel of makeup brushes, and are easy to achieve a soft and comfortable texture, which is more suitable for sensitive skin. However, this type of makeup brush is difficult to achieve a long-lasting and efficient antibacterial effect, and the antibacterial performance is unstable, requiring regular replacement or maintenance.

[0004] Therefore, it is necessary to develop an antibacterial makeup brush with good antibacterial property and wider applicability. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a method for preparing antibacterial bristles, which improves the antibacterial property and durability of the bristles, does not require the addition of metal antibacterial agents, and has wide applicability.

[0006] The present invention also provides antibacterial bristles prepared by the above-mentioned preparation method.

[0007] The present invention also provides application of the antibacterial bristles.

[0008] Specifically, the first embodiment of the present invention relates to a method for preparing antibacterial bristles, comprising the following steps:

[0009] S1: dissolving chitosan in an acidic aqueous solution to obtain a chitosan solution; dissolving cyanuric chloride in a solvent to obtain a cyanuric chloride solution;

[0010] S2: adding the bristles treated with oxygen plasma to the chitosan solution, adding the cyanuric chloride solution, reacting at a pH of 6 to 7 and a temperature of ≤15° C., separating the bristles after the reaction to obtain modified bristles;

[0011] S3: adding the modified bristles into a quaternary ammonium salt solution for immersion treatment, and drying to obtain the antibacterial bristles.

[0012] The method for preparing antibacterial bristles according to the first embodiment of the present invention has at least the following beneficial effects:

[0013] The bristles are treated with oxygen plasma, and free radicals are generated by oxygen plasma activation, and oxygen-containing groups such as hydroxyl groups are introduced on the fiber surface, thereby increasing the surface activity of the fiber and promoting the reaction of cyanuric chloride with the activated hydroxyl groups on the fiber surface. At the same time, cyanuric chloride can react with the hydroxyl groups of chitosan, thereby enabling chitosan to be firmly bonded to the fiber surface, improving the defect of weak bonding between the antibacterial agent and the fiber surface. Oxygen plasma treatment can also increase the roughness of the fiber surface, improve the wettability of the fiber surface, and help the antibacterial agent (chitosan and quaternary ammonium salt) to be adsorbed on the fiber surface.

[0014] Both chitosan and quaternary ammonium salts have antibacterial activity. The reaction of cyanuric chloride with chitosan and fiber surface hydroxyl groups facilitates the adsorption of chitosan on the fiber surface, which in turn promotes the adsorption of quaternary ammonium salts on the fiber surface (for example, forming more hydrogen bonds, and chitosan itself has a certain adhesion), significantly improving the antibacterial properties.

[0015] This method does not require the addition of metal antibacterial agents and can better meet the usage needs of different groups of people. It also has a simple process, a wide source of raw materials, and is easy to industrialize.

[0016] In some embodiments, in step S1, the acidic aqueous solution is an acetic acid solution with a mass percentage concentration of 1% to 8%, and non-limiting examples of the concentration of the acetic acid solution are: any value among 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8% or any value between any two of them.

[0017] In some embodiments, in step S1, the temperature of dissolving chitosan in the acidic aqueous solution is 25-80°C, non-limiting examples are: any value among 25°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C or any value in between.

[0018] Properly increasing the concentration of acetic acid solution or heating during the dissolution process is conducive to the rapid dissolution of chitosan.

[0019] In some embodiments, in step S1, the mass percentage concentration of chitosan in the chitosan solution is 1% to 5%, and non-limiting examples are: any value among 1%, 2%, 3%, 4%, 5% or any value in between.

[0020] In some embodiments, in step S1, the solvent is selected from a combination of one or more of N,N-dimethylformamide, tetrahydrofuran and acetonitrile.

[0021] In some embodiments, in step S1, the mass percentage concentration of the cyanuric chloride solution is 5% to 10%, and non-limiting examples are: any value among 5%, 6%, 7%, 8%, 9%, 10% or any value in between any two.

[0022] In some embodiments, in step S2, the conditions of the oxygen plasma treatment are: 2000-3000Pa oxygen atmosphere, voltage of 150-250V, and treatment time of 5-15min. Under this condition, the treatment effect is better and the obtained fiber has better antibacterial properties. Non-limiting examples of oxygen pressure are: any value of 2000Pa, 2200Pa, 2500Pa, 2800Pa, 3000Pa or any value between any two. Non-limiting examples of voltage are: any value of 150V, 180V, 200V, 220V, 250V or any value between any two. Non-limiting examples of oxygen plasma treatment time are: any value of 5min, 10min, 15min or any value between any two.

[0023] In some embodiments, in step S2, the solid-to-liquid ratio of the bristles to the chitosan solution is 5 to 20 g / 100 mL, and non-limiting examples are: any value among 5 g / 100 mL, 10 g / 100 mL, 15 g / 100 mL, 20 g / 100 mL, or any value in between any two of them.

[0024] In some embodiments, in step S2, the solid-to-liquid ratio of the bristles to the chitosan solution is 5 to 10 g / 100 mL.

[0025] In some embodiments, in step S2, the mass ratio of cyanuric chloride to chitosan is 1 to 2:1, and non-limiting examples are: any value among 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 2:1 or any value in between any two thereof.

[0026] In some embodiments, in step S2, the mass ratio of cyanuric chloride to chitosan is 1.4-1.8:1.

[0027] In some embodiments, in step S2, the pH of the reaction is any one of 6, 6.5, 7, or any value therebetween.

[0028] In some embodiments, in step S2, an acid binding agent is used to adjust the pH to 6-7.

[0029] In some embodiments, in step S2, the acid binding agent is selected from a combination of one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, and organic amines.

[0030] Among them, non-limiting examples of organic amines are: a combination of one or more of N,N-diisopropylethylamine, pyridine, trimethylamine, triethylamine and isopropylamine.

[0031] In some embodiments, in step S2, the reaction temperature is 0-10° C., non-limiting examples include: any value of 0° C., 5° C., 10° C., or any value therebetween. A lower reaction temperature is beneficial for the reaction of cyanuric chloride with active hydroxyl groups, reducing side reactions.

[0032] In some embodiments, in step S2, the reaction time is 2 to 4 hours, and non-limiting examples are: any value among 2 hours, 3 hours, 4 hours, or any value in between.

[0033] In some embodiments, in step S2, stirring is performed during the reaction. Stirring promotes dispersion, and the present invention does not limit the specific stirring rate.

[0034] In some embodiments, in step S2, the bristles are separated by filtering.

[0035] In some embodiments, step S2 further includes washing the filtered bristles with water.

[0036] In some embodiments, in step S3, in the quaternary ammonium salt solution, the quaternary ammonium salt includes dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride (CAS No.: 27668-52-6) and polydimethyldiallylammonium chloride (CAS No.: 26062-79-3).

[0037] Quaternary ammonium salts can interact with negatively charged microbial cell walls through electrostatic adsorption, thereby destroying the cell structure of microorganisms. Dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride contains siloxy groups, which can bind to the hydroxyl groups on the surface of bristles (including residual hydroxyl groups of chitosan and hydroxyl groups on the surface of bristles) after hydrolysis to achieve a strong bond. There are multiple quaternary ammonium salt groups in the polydimethyldiallylammonium chloride molecule, that is, multiple electrostatic adsorption sites, which can enhance the antibacterial effect. The combination of the two can improve the antibacterial properties and provide extensive and long-lasting antibacterial protection.

[0038] In some embodiments, in step S3, in the quaternary ammonium salt solution, the mass ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride to polydimethyldiallylammonium chloride is 2 to 4:1, and non-limiting examples are: any value among 2:1, 2.5:1, 3:1, 3.5:1, 4:1 or any value between any two of them.

[0039] In some embodiments, in step S3, in the quaternary ammonium salt solution, the mass ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride to polydimethyldiallylammonium chloride is 3 to 4:1.

[0040] In some embodiments, in step S3, in the quaternary ammonium salt solution, the total mass percentage concentration of the quaternary ammonium salt is 2% to 10%, and non-limiting examples are: any value among 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10% or any value between any two thereof.

[0041] In some embodiments, in step S3, the solvent in the quaternary ammonium salt solution is selected from a combination of one or more of water and alcohol, wherein non-limiting examples of alcohol include a combination of one or more of methanol, ethanol and isobutanol.

[0042] In some embodiments, in step S3, the immersion treatment time is 1 to 3 minutes, and non-limiting examples are: any value among 1 minute, 1.5 minutes, 2 minutes, 2.5 minutes, 3 minutes, or any value in between.

[0043] In some embodiments, in step S3, the solid-liquid ratio of the modified bristles to the quaternary ammonium salt solution is not particularly limited, and the amount of the quaternary ammonium salt is generally controlled to be greater than the saturated adsorption amount during the immersion time, and the quaternary ammonium salt solution can be repeatedly immersed for multiple times. The leached fibers are drained and dried, and the drained liquid is reused in the immersion process.

[0044] In some embodiments, in step S3, the drying temperature is 70-90°C, and non-limiting examples are: any value among 70°C, 80°C, 90°C, or any value in between.

[0045] In some embodiments, the bristles are made of a material selected from the group consisting of synthetic fibers and animal-derived fibers.

[0046] The material of the synthetic fiber may be any known type, and a non-limiting example is a combination of one or more of polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate and nylon.

[0047] The bristles may also be various well-known animal-derived fibers (animal hair), non-limiting examples of which include wool, squirrel hair, horsetail hair, rabbit hair, fox hair, mink hair, gray squirrel hair, weasel hair, and the like.

[0048] A second embodiment of the present invention relates to antibacterial bristles produced by the above-mentioned preparation method.

[0049] The antibacterial bristles are prepared by the above-mentioned preparation method, and therefore, at least have all the beneficial effects of the above-mentioned preparation method. Furthermore, the prepared antibacterial bristles have excellent antibacterial properties and lasting antibacterial effects, and are suitable for use by a variety of people.

[0050] A third aspect of the present invention relates to a cosmetic brush comprising the above-mentioned antibacterial bristles.

[0051] The cosmetic brush comprises the above-mentioned antibacterial bristles, which improves the antibacterial property and durability of the cosmetic brush, and can better ensure the hygiene and wide applicability of the cosmetic brush during long-term use.

[0052] In some embodiments, the makeup brush includes at least one of a foundation brush, a concealer brush, a loose powder brush, a blush brush, a highlighter brush, an eye shadow brush, an eyeliner brush, an eyebrow brush, a lip brush, a contouring brush, or an eyelash brush.

[0053] Herein, "plurality" includes two or more than two; when referring to a numerical range, the term "plurality" includes both the end values ​​and any subset range within the range.

[0054] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. DETAILED DESCRIPTION

[0055] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0056] In the following examples, some of the raw materials are described as follows:

[0057] Dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride: Bi-ome AM5, Devan Company.

[0058] Polydimethyldiallylammonium chloride: Devatec NA, Devan Corporation.

[0059] Unless otherwise specified, the raw materials involved are commercially available conventional products.

[0060] Antibacterial rate test: refer to GB / T 20944.2-2007 test, sample is not washed, mass is 0.4g, TSB medium, test bacterial suspension concentration is 10 7 CFU / mL, test volume 0.2 mL (mixed with sample and cultured for 24 h).

[0061] Antibacterial durability test: The bristles are tied into a fiber bundle with a diameter of 2 cm and a length of 4 cm. The fiber bundle is inserted into the loose powder to make it saturated with powder. The fiber bundle with powder is rubbed by hand 200 times (simulating extreme use conditions), and then the loose powder is washed off and dried. The antibacterial rate is tested according to the above method.

[0062] Example 1

[0063] An antibacterial bristle is prepared, and the preparation method comprises the steps of:

[0064] 1. Add chitosan to an acetic acid aqueous solution (5 wt%) and heat to 50°C to dissolve to prepare a chitosan solution with a mass concentration of 2 wt%.

[0065] 2. Add cyanuric chloride into DMF and dissolve it to obtain an 8 wt % cyanuric chloride solution.

[0066] 3. Take nylon bristles and treat them with oxygen plasma. The treatment parameters are: 2500Pa oxygen atmosphere, voltage 200V, and treatment for 10 minutes.

[0067] 4. Immerse the bristles treated with oxygen plasma in the above chitosan solution with a solid-liquid ratio of 8g / 100mL, control the temperature at 5°C, slowly add the above cyanuric chloride solution to make the mass ratio of cyanuric chloride to chitosan be 1.5:1, add sodium hydroxide to adjust the pH to 6.5, slowly stir (100rpm) and react for 3h, filter, take the bristles, wash with deionized water, and drain.

[0068] 5. Mix the quaternary ammonium antibacterial agent Bi-ome AM5 (containing solvent methanol aqueous solution, mainly water) and Devatec NA (containing solvent water) so that the mass ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and polydimethyldiallylammonium chloride is 3:1, and add deionized water to adjust the total concentration to 5wt%, to obtain a quaternary ammonium salt solution.

[0069] 6. Immerse the bristles treated in step 4 into the quaternary ammonium salt solution of step 5, leave for 1 minute, take out and drain, and reuse the drained liquid for the immersion treatment. Dry the obtained bristles at 70°C.

[0070] Example 2

[0071] An antibacterial bristle is prepared, and the preparation method comprises the steps of:

[0072] 1. Add chitosan to an acetic acid aqueous solution (5 wt%) and heat to 50°C to dissolve to prepare a chitosan solution with a mass concentration of 3 wt%.

[0073] 2. Add cyanuric chloride into DMF and dissolve it to obtain a 6 wt% cyanuric chloride solution.

[0074] 3. Take nylon bristles and treat them with oxygen plasma. The treatment parameters are: 2500Pa oxygen atmosphere, voltage 200V, and treatment for 10 minutes.

[0075] 4. Immerse the bristles treated with oxygen plasma in the above chitosan solution with a solid-liquid ratio of 10g / 100mL, control the temperature at 5°C, slowly add the above cyanuric chloride solution to make the mass ratio of cyanuric chloride to chitosan be 1.6:1, add sodium hydroxide to adjust the pH to 6.5, slowly stir (100rpm) and react for 3h, filter, take the bristles, wash with deionized water, and drain.

[0076] 5. Mix the quaternary ammonium antibacterial agent Bi-ome AM5 (containing solvent methanol aqueous solution, mainly water) and Devatec NA (containing solvent water) so that the mass ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and polydimethyldiallylammonium chloride is 3.5:1, and add deionized water to adjust the total concentration to 5wt%, to obtain a quaternary ammonium salt solution.

[0077] 6. Immerse the bristles treated in step 4 into the quaternary ammonium salt solution of step 5, leave for 2 minutes, take out and drain, and reuse the drained liquid for the immersion treatment. The obtained bristles are dried at 70°C.

[0078] Comparative Example 1 (without oxygen plasma treatment)

[0079] An antibacterial bristle is prepared, and the preparation method comprises the steps of:

[0080] 1. Add chitosan to an acetic acid aqueous solution (5 wt%) and heat to 50°C to dissolve to prepare a chitosan solution with a mass concentration of 2 wt%.

[0081] 2. Add cyanuric chloride into DMF and dissolve it to obtain an 8 wt % cyanuric chloride solution.

[0082] 3. Immerse the bristles in the chitosan solution with a solid-liquid ratio of 8g / 100mL. Control the temperature at 5°C. Slowly add the cyanuric chloride solution to make the mass ratio of cyanuric chloride to chitosan 1.5:1. Add sodium hydroxide to adjust the pH to 6.5. Slowly stir (100rpm) and react for 3h. Filter. Take the bristles, wash with deionized water, and drain.

[0083] 4. Mix the quaternary ammonium antibacterial agent Bi-ome AM5 (containing solvent methanol aqueous solution, mainly water) and Devatec NA (containing solvent water) so that the mass ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and polydimethyldiallylammonium chloride is 3:1, and add deionized water to adjust the total concentration to 5wt%, to obtain a quaternary ammonium salt solution.

[0084] 5. Immerse the bristles treated in step 3 into the quaternary ammonium salt solution of step 4, leave for 1 minute, take out and drain, and reuse the drained liquid for the immersion treatment. Dry the obtained bristles at 70°C.

[0085] Comparative Example 2 (no cyanuric chloride modification)

[0086] An antibacterial bristle is prepared, and the preparation method comprises the steps of:

[0087] 1. Add chitosan to an acetic acid aqueous solution (5 wt%) and heat to 50°C to dissolve to prepare a chitosan solution with a mass concentration of 2 wt%.

[0088] 2. Take nylon bristles and treat them with oxygen plasma. The treatment parameters are: 2500Pa oxygen atmosphere, voltage 200V, and treatment for 10 minutes.

[0089] 3. Immerse the bristles treated with oxygen plasma in the above chitosan solution with a solid-liquid ratio of 8 g / 100 mL, add sodium hydroxide to adjust the pH to 8, slowly stir (100 rpm) for 3 h, centrifuge, take the precipitate, wash with deionized water, and drain.

[0090] 4. Mix the quaternary ammonium antibacterial agent Bi-ome AM5 (containing solvent methanol aqueous solution, mainly water) and Devatec NA (containing solvent water) so that the mass ratio of dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and polydimethyldiallylammonium chloride is 3:1, and add deionized water to adjust the total concentration to 5wt%, to obtain a quaternary ammonium salt solution.

[0091] 5. Immerse the bristles treated in step 3 into the quaternary ammonium salt solution of step 4, leave for 1 minute, take out and drain, and reuse the drained liquid for the immersion treatment. Dry the obtained bristles at 70°C.

[0092] The antibacterial rates of the bristles of Examples 1-2 and Comparative Examples 1-2 are shown in Table 1.

[0093] Table 1

[0094]

[0095] From the above effects, it can be seen that the bristles prepared in the embodiments of the present invention have a higher antibacterial rate, good antibacterial durability, and better antibacterial performance.

[0096] From the comparison between Comparative Example 1 and Example 1, it can be seen that without oxygen plasma treatment, the antibacterial rate and its durability are significantly reduced. This may be because the active hydroxyl groups on the fiber surface decrease and the lack of surface roughening effect of oxygen plasma affects the attachment of chitosan and quaternary ammonium salt on the fiber surface.

[0097] From the performance comparison between Comparative Example 2 and Example 1, it can be seen that the absence of cyanuric chloride modification may affect the interface adhesion due to the lack of cross-linking and bridging effects of cyanuric chloride, and the antibacterial persistence drops sharply. However, the antibacterial rate of Comparative Example 2 is higher than that of Comparative Example 1, indicating that oxygen plasma treatment may be beneficial to the attachment of chitosan and quaternary ammonium salt (fiber surface energy is higher, and the surface area increases after coarsening).

[0098] In summary, the antibacterial bristles prepared in this embodiment have excellent antibacterial properties and lasting antibacterial effects, can better meet the requirements of long-term antibacterial properties of cosmetic brushes, ensure hygiene during long-term use, and do not require the addition of metal antibacterial agents, so they are suitable for a wider range of people.

[0099] The embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A method for preparing antibacterial bristles, characterized in that: The following steps are involved: S1: dissolving chitosan in an acidic aqueous solution to obtain a chitosan solution; dissolving cyanuric chloride in a solvent to obtain a cyanuric chloride solution; S2: adding the bristles treated with oxygen plasma to the chitosan solution, adding the cyanuric chloride solution, reacting at a pH of 6 to 7 and a temperature of ≤15° C., separating the bristles after the reaction to obtain modified bristles; S3: adding the modified bristles into a quaternary ammonium salt solution for immersion treatment, and drying to obtain the antibacterial bristles.

2. The preparation method according to claim 1, characterized in that: In step S1, the acidic aqueous solution is an acetic acid solution with a mass percentage concentration of 1% to 8%; and / or, the temperature for dissolving chitosan in the acidic aqueous solution is 25 to 80° C.; and / or, in the chitosan solution, the mass percentage concentration of chitosan is 1% to 5%; and / or, the solvent is selected from a combination of one or more of N,N-dimethylformamide, tetrahydrofuran and acetonitrile; and / or, the mass percentage concentration of the cyanuric chloride solution is 5% to 10%.

3. The preparation method according to claim 1, characterized in that: In step S2, the conditions of the oxygen plasma treatment are: 2000-3000 Pa oxygen atmosphere, voltage of 150-250 V, and treatment time of 5-15 min.

4. The preparation method according to claim 1, characterized in that: In step S2, the solid-liquid ratio of the bristles to the chitosan solution is 5-20 g / 100 mL; and / or the mass ratio of cyanuric chloride to chitosan is 1-2:1; and / or the reaction temperature is 0-10° C.; and / or the reaction time is 2-4 h.

5. The preparation method according to claim 1, characterized in that: In step S2, an acid-binding agent is used to adjust the pH to 6-7; optionally, the acid-binding agent is selected from a combination of one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, and organic amines.

6. The preparation method according to claim 1, characterized in that: In the quaternary ammonium salt solution, the quaternary ammonium salt includes dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride and polydimethyldiallylammonium chloride; optionally, the mass ratio of the dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride to the polydimethyldiallylammonium chloride is 2 to 4:

1.

7. The preparation method according to claim 1 or 6, characterized in that: In the quaternary ammonium salt solution, the total mass percentage concentration of the quaternary ammonium salt is 2% to 10%; and / or, in the quaternary ammonium salt solution, the solvent is selected from a combination of one or more of water and alcohol.

8. The preparation method according to claim 1, characterized in that: The immersion treatment time is 1 to 3 minutes; and / or the drying temperature is 70 to 90°C. 9.An antibacterial bristle, characterized in that: The method is prepared according to any one of claims 1 to 8.

10. A cosmetic brush, characterized in that: Comprising the antibacterial bristles as described in claim 9.

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