Antibacterial woodenware coating based on water-based macromolecule combination as well as preparation method and application of antibacterial woodenware coating

Abstract

The invention discloses an antibacterial wood coating based on water-based macromolecule combination. The antibacterial wood coating comprises the following components: a water-based macromolecule matrix, nano-silver particles, nano-copper particles, nano-titanium dioxide, a propolis extract, a dispersing agent, a surfactant, an antioxidant, an organic silicon compound, an ultraviolet light absorber, sodium polyacrylate, a cross-linking agent and deionized water. According to the antibacterial wood coating based on water-based macromolecule combination, the technical problems of stability, antibacterial effect, environmental friendliness, multifunctionality and the like of the antibacterial wood coating are solved, and an efficient, lasting and environment-friendly solution is provided.

Description

Technical Field

[0001] The invention relates to an antibacterial wood coating based on water-based macromolecule binding, and a preparation method and application thereof. Background Art

[0002] With the advancement of science and technology and the improvement of people's living standards, antimicrobial materials are increasingly used in medical applications, food packaging, textiles, and other fields. In particular, the application of nanotechnology has made nano-antimicrobial materials a hot topic of research due to their excellent antimicrobial properties and wide applicability. However, existing nano-antimicrobial materials still have some technical limitations, which limit their widespread use in practical applications.

[0003] First, the stability and dispersibility of nanoparticles are key issues in current nano-antibacterial materials. Due to the high surface area of ​​nanoparticles such as nanosilver, nanocopper, and nanotitanium dioxide, they are prone to aggregation or precipitation. This not only reduces the effective antibacterial effect of the nanoparticles but also significantly compromises the stability and operability of these materials in practical applications. To prevent particle aggregation and precipitation, many researchers have adopted methods such as surface modification or the addition of dispersants. However, the effectiveness and feasibility of these methods remain limited.

[0004] Secondly, the durability of antimicrobial effects is also a major challenge for antimicrobial wood coatings. Existing nano-antimicrobial materials can exhibit strong antimicrobial activity for a period of time, but due to environmental factors such as ultraviolet radiation and oxidation, their antimicrobial effect tends to gradually weaken, resulting in a limited service life. Although some studies have attempted to enhance the stability of antimicrobial agents by adding antioxidants and ultraviolet absorbers, technical deficiencies remain, especially when the antimicrobial effect is difficult to maintain under long-term exposure to harsh environmental conditions.

[0005] Furthermore, surface treatment and functionalization are also pressing challenges for nano-antimicrobial materials. Existing antimicrobial materials often possess only a single antimicrobial function and lack multifunctional properties. For example, many antimicrobial coatings still have limitations in terms of UV protection, surface adhesion, or wear resistance. Therefore, effectively combining different functional substances and fully utilizing them in antimicrobial materials remains a bottleneck in current technology.

[0006] Finally, environmental friendliness and non-toxicity are also significant factors hindering the widespread application of nano-antimicrobial materials. Many antimicrobial wood coatings use organic solvents or other chemicals, which may pose potential risks to the environment and human health. Therefore, developing environmentally friendly and non-toxic water-based nano-antimicrobial materials has become a pressing challenge for researchers. Summary of the Invention

[0007] The purpose of the present invention is to provide an antibacterial wood coating based on water-based macromolecules and its preparation method and application, which solves the technical difficulties of antibacterial wood coatings in terms of stability, antibacterial effect, environmental friendliness, and multifunctionality, and provides an efficient, long-lasting and environmentally friendly solution.

[0008] The technical solution adopted by the present invention to solve its technical problem is:

[0009] The invention discloses an antibacterial wood coating based on water-based macromolecule combination, comprising the following components: a water-based macromolecular matrix, nano-silver particles, nano-copper particles, nano-titanium dioxide, propolis extract, a dispersant, a surfactant, an antioxidant, an organosilicon compound, an ultraviolet absorber, sodium polyacrylate, a crosslinking agent and deionized water.

[0010] Preferably, the composition comprises the following ingredients in weight percentage: 45%-55% of aqueous macromolecular matrix, 10%-15% of nano-silver particles, 5%-10% of nano-copper particles, 3%-5% of nano-titanium dioxide, 1%-3% of propolis extract, 1%-5% of dispersant, 1%-3% of surfactant, 0.1%-0.5% of antioxidant, 2%-8% of organosilicon compound, 0.5%-2% of ultraviolet absorber, 2%-10% of sodium polyacrylate, 0.1%-0.5% of cross-linking agent, and the balance is deionized water.

[0011] Preferably, the aqueous macromolecular matrix is ​​polyvinyl alcohol, polyacrylic acid, polylactic acid or other water-soluble polymers.

[0012] Preferably, the dispersant is polyvinyl pyrrolidone or polyethylene oxide.

[0013] Preferably, the surfactant is sodium dodecylbenzenesulfonate; and the antioxidant is tocopherol.

[0014] Preferably, the organosilicon compound is polydimethylsiloxane or organosilane.

[0015] Preferably, the ultraviolet absorber is benzotriazole or zinc oxide.

[0016] Preferably, the cross-linking agent is glutaraldehyde or diisocyanate.

[0017] Another technical problem to be solved by the present invention is to provide a method for preparing an antibacterial wood coating based on water-based macromolecular bonding, comprising the following steps:

[0018] Add the aqueous macromolecular matrix into deionized water, stir and heat until completely dissolved to obtain a uniform aqueous matrix solution;

[0019] Nanoparticles such as silver nanoparticles, copper nanoparticles and titanium dioxide nanoparticles are mixed with deionized water by ultrasonic treatment, and are uniformly dispersed using a dispersant and a surfactant to prevent agglomeration of the particles;

[0020] Add the propolis extract to the aqueous matrix solution and stir evenly to ensure that the propolis extract is fully dissolved or dispersed;

[0021] Gradually add dispersed nano-silver particles, nano-copper particles and nano-titanium dioxide into the aqueous matrix solution, stir evenly, and add ultraviolet absorber and antioxidant;

[0022] Sodium polyacrylate is added, followed by a cross-linking agent, and the cross-linking reaction is promoted while stirring to form a cross-linked network structure;

[0023] Add the organosilicon compound and continue to stir the solution to ensure that all components are evenly distributed and react;

[0024] After the reaction is completed, a filter is used to remove large particles or impurities in the solution, and then a stability test is performed to observe the dispersion of the nanoparticles in the solution and confirm whether there is precipitation or particle aggregation;

[0025] The prepared antibacterial wood coating solution is placed in a suitable container and sealed for storage.

[0026] Another technical problem to be solved by the present invention is to provide an antibacterial wood coating based on water-based macromolecules for use in medical dressings, wound disinfection, and antibacterial treatment of medical device surfaces.

[0027] The beneficial effects of the present invention are:

[0028] By introducing dispersants and surfactants, the aggregation of particles can be effectively prevented and the uniform dispersion of particles can be maintained, thereby improving the stability and antibacterial activity of the nanoparticles; by using ingredients such as propolis extract, antioxidants and UV absorbers, the durability and effectiveness of the antibacterial agent can be enhanced, resisting the influence of the external environment (such as ultraviolet rays, oxidation, etc.) and extending its validity period; by introducing silicone compounds and cross-linking agents into the formula, the surface properties of the material can be improved, such as improving its adhesion, durability and water stability, while enhancing the strength and wear resistance of the antibacterial coating.

[0029] This antibacterial wood coating uses a water-based macromolecular matrix as the main solvent. Compared with organic solvents, it is more environmentally friendly and non-toxic, and reduces pollution to the environment, which is in line with the current green and environmentally friendly technology trend. This solution not only has antibacterial properties, but also has multiple functions such as anti-ultraviolet and anti-oxidation. It can adapt to the needs of different application fields, such as medical, textile, food packaging, etc., thereby improving the application breadth and comprehensive performance of antibacterial wood coatings. Specific implementation methods

[0030] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] Example 1

[0033] Preparation of antibacterial wood coating based on water-based macromolecule combination, the raw material ratio is as follows:

[0034] Aqueous macromolecular matrix: 50%, nanosilver particles: 12%, nanocopper particles: 6%, nanotitanium dioxide: 4%, propolis extract: 2%, dispersant: 3%, surfactant: 2%, antioxidant: 0.2%, organosilicon compound: 5%, UV absorber: 1%, sodium polyacrylate: 4%, cross-linking agent: 0.2%, and the balance is deionized water.

[0035] Preparation steps:

[0036] According to the above ratio, polyvinyl alcohol was added to deionized water and heated and stirred until completely dissolved to obtain a uniform aqueous matrix solution;

[0037] Using ultrasonic waves to treat nano-silver particles, nano-copper particles and nano-titanium dioxide, they are evenly dispersed by dispersants and surfactants to prevent particle aggregation;

[0038] Add propolis extract to the aqueous matrix solution and stir well;

[0039] Gradually add the dispersed nanoparticles into the matrix solution, add the UV absorber, antioxidant and other ingredients, and stir evenly;

[0040] Sodium polyacrylate is added and stirring is continued, followed by adding a cross-linking agent to promote the cross-linking reaction and ultimately form a cross-linked network structure;

[0041] Add the silicone compound and continue stirring to ensure even distribution of the ingredients.

[0042] The prepared antibacterial wood coating has good antibacterial effect, especially in its ability to inhibit Escherichia coli and Staphylococcus aureus; the nanoparticles are evenly dispersed in the solution, and no precipitation or particle aggregation is found. In the stability test, they can still maintain good dispersion after long-term storage.

[0043] Example 2

[0044] Preparation of antibacterial wood coating based on water-based macromolecule combination, the raw material ratio is as follows:

[0045] Aqueous macromolecular matrix: 48%, nanosilver particles: 10%, nanocopper particles: 8%, nanotitanium dioxide: 4%, propolis extract: 1.5%, dispersant: 2.5%, surfactant: 1.5%, antioxidant: 0.3%, organosilicon compound: 3%, UV absorber: 0.8%, sodium polyacrylate: 6%, cross-linking agent: 0.3%, and the balance is deionized water.

[0046] Preparation steps:

[0047] Add polyacrylic acid into deionized water and heat to dissolve to obtain a uniform solution;

[0048] Nanosilver, nanocopper and nanotitanium dioxide were ultrasonically dispersed in water and kept stable after adding dispersants and surfactants;

[0049] Add propolis extract to the aqueous matrix solution and stir well;

[0050] Gradually add the dispersed nanoparticles, stir evenly, and then add the UV absorber and antioxidant;

[0051] Add sodium polyacrylate and cross-linking agent and continue stirring to promote the cross-linking reaction;

[0052] Add the organosilicon compound, ensuring that the ingredients are evenly mixed and the reaction is complete.

[0053] The antibacterial wood coating of this embodiment has strong antibacterial properties, especially in terms of the inhibitory effect on Staphylococcus aureus and Salmonella; the product has good stability. After 3 months of storage, no precipitation or particle aggregation appeared in the solution, and the antibacterial effect remained stable.

[0054] Example 3

[0055] Preparation of antibacterial wood coating based on water-based macromolecule combination, the raw material ratio is as follows:

[0056] Aqueous macromolecular matrix: 52%, nanosilver particles: 14%, nanocopper particles: 7%, nanotitanium dioxide: 3%, propolis extract: 2.5%, dispersant: 4%, surfactant: 1%, antioxidant: 0.1%, organosilicon compound: 6%, UV absorber: 0.6%, sodium polyacrylate: 5%, cross-linking agent: 0.2%, and the balance is deionized water.

[0057] Preparation steps:

[0058] Polyvinyl alcohol is heated and dissolved in deionized water until transparent to obtain an aqueous matrix solution;

[0059] Nanosilver, copper particles, and titanium dioxide particles are dispersed in water, dispersants and surfactants are added, and ultrasonic treatment is performed to ensure uniform dispersion;

[0060] Add propolis extract to the aqueous base solution and stir until homogeneous;

[0061] Gradually add the nanoparticle solution, UV absorber, antioxidant and other ingredients and stir well;

[0062] Finally, sodium polyacrylate and a cross-linking agent are added, stirred, and the cross-linking reaction is promoted to form a cross-linked structure;

[0063] Continue stirring after adding the silicone compound to ensure that all ingredients are evenly distributed.

[0064] The antibacterial wood coating obtained in this example has strong antibacterial ability, especially showing a significant antibacterial effect during wound disinfection; it has good dispersibility in the solution, and no precipitation occurs after storage for 3 months, and the antibacterial effect is sustained and stable.

[0065] Example 4

[0066] Preparation of antibacterial wood coating based on water-based macromolecule combination, the raw material ratio is as follows:

[0067] Aqueous macromolecular matrix: 55%, nanosilver particles: 13%, nanocopper particles: 6%, nanotitanium dioxide: 5%, propolis extract: 1.5%, dispersant: 3%, surfactant: 2%, antioxidant: 0.4%, organosilicon compound: 7%, UV absorber: 1.5%, sodium polyacrylate: 4%, cross-linking agent: 0.3%, and the balance is deionized water.

[0068] Preparation steps:

[0069] Dissolve polyacrylic acid in deionized water and stir evenly to obtain an aqueous matrix solution;

[0070] Nanosilver, copper, and titanium dioxide particles were treated with ultrasound and mixed with dispersants and surfactants to ensure uniform particle dispersion;

[0071] Add propolis extract and mix well, then gradually add dispersed nanoparticles, UV absorber and antioxidant and mix well;

[0072] After adding sodium polyacrylate and cross-linking agent, continue stirring to promote the cross-linking reaction;

[0073] Add the silicone compound last to ensure even distribution of all ingredients.

[0074] The antibacterial wood coating prepared in this embodiment shows excellent effects in wound disinfection and antibacterial treatment of medical device surfaces, and can effectively reduce the risk of bacterial infection; the prepared antibacterial wood coating solution has a strong ultraviolet shielding effect, and the addition of antioxidants further improves the stability of the product.

[0075] Experimental example

[0076] The performance differences of the antibacterial wood coatings prepared in Examples 1-4 compared with existing antibacterial wood coatings in terms of particle dispersibility, stability, antibacterial performance, durability, environmental protection and multiple functions were verified.

[0077] Experimental Materials:

[0078] Antimicrobial Wood Coatings of Examples 1-4 (Samples Prepared in Each Example)

[0079] Existing antimicrobial wood coatings (traditional commercially available antimicrobial wood coatings that use organic solvents as a matrix)

[0080] Reagents: Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), ultraviolet lamp (365nm wavelength), oxidant (H2O2), deionized water, and other standard laboratory equipment.

[0081] Experimental methods:

[0082] 1. Particle dispersion test:

[0083] Dynamic light scattering (DLS) was used to determine the particle size distribution and homogeneity of each sample.

[0084] Analyze particle size and distribution width to evaluate dispersion and stability.

[0085] 2. Antibacterial performance test:

[0086] The antibacterial activity of each antibacterial wood coating against Escherichia coli and Staphylococcus aureus was determined by the disc diffusion method.

[0087] The antibacterial activity was evaluated by measuring the diameter of the inhibition zone.

[0088] 3. Durability and antioxidant capacity test:

[0089] Each antimicrobial agent was exposed to ultraviolet light (365 nm wavelength) for 24 hours to simulate the effect of ultraviolet light on the antimicrobial agent.

[0090] The effects of antioxidants were measured using oxidation-reduction potential (ORP) to investigate whether the antimicrobial effect declined with increasing UV exposure time.

[0091] 4. Anti-ultraviolet effect test:

[0092] The UV transmittance test is used to evaluate the effect of UV absorbers in antimicrobial agents and to determine the effect of UV on the stability of antimicrobial agents.

[0093] 5. Surface adhesion and wear resistance test:

[0094] Different antimicrobial wood coating samples were applied to textile or medical surfaces and their surface adhesion, durability, and wear resistance were evaluated using adhesion tests (such as tape peeling) and friction and wear tests.

[0095] The effects of silicone compounds and crosslinkers were tested by evaluating the coating's drop and wear.

[0096] 6. Environmental protection test:

[0097] The environmental impacts of aqueous macromolecular matrices and existing organic solvent matrices were compared using environmental pollution indicators (such as VOC content) and non-toxicity assessment methods (such as fish lethal concentration test).

[0098] The experimental data are shown in Table 1 below

[0099] Table 1

[0100]

[0101]

[0102] Average particle size and dispersibility:

[0103] The average particle size of the particles in Examples 1-4 is all between 30-40 nm, and the PDI (polydispersity index) is all less than 0.2, indicating that the particles are evenly distributed and stable, with less particle aggregation. The existing antibacterial wood coating particles are larger (50 nm) and have a higher PDI (0.30), indicating that the particles are poorly dispersed and easily aggregated, affecting their stability and antibacterial effect.

[0104] Antimicrobial properties:

[0105] The antibacterial wood coatings of Examples 1-4 have obvious antibacterial effects on Escherichia coli and Staphylococcus aureus, with the maximum diameter of the inhibition zone being 19 mm. The inhibition zone of existing antibacterial wood coatings is smaller, only 12 mm, and the antibacterial effect is relatively poor.

[0106] Durability and UV resistance:

[0107] After 24 hours of ultraviolet irradiation, the antibacterial effects of the antibacterial agents of Examples 1-4 were well maintained and attenuated less (maintaining more than 90% of the effect); the antibacterial effect of the existing antibacterial wood coatings decreased significantly after ultraviolet irradiation, attenuating by more than 50%, indicating that they were not stable under ultraviolet light.

[0108] Antioxidant capacity:

[0109] The antioxidant capacity of Examples 1-4 is relatively strong, with ORP values ​​between 315-330, indicating that they can effectively resist oxidation; the antioxidant capacity of existing antibacterial wood coatings is relatively weak, with an ORP value of only 220, and they are easily damaged by oxidation.

[0110] UV absorption rate:

[0111] The ultraviolet absorption rate of Examples 1-4 is relatively high (80%-82%), which can effectively prevent ultraviolet damage to the antibacterial agent; the ultraviolet absorption rate of existing antibacterial wood coatings is relatively low, only 40%, and ultraviolet rays have a greater impact on them.

[0112] Surface adhesion and wear resistance:

[0113] The surface adhesion and wear resistance of Examples 1-4 are excellent, with strong adhesion (2.4-2.7N / cm) and good wear resistance (friction wear is 0.08-0.12mm 3 The existing antibacterial wood coatings have poor performance in these two aspects, with adhesion of only 1.2N / cm and poor wear resistance (friction wear of 0.3mm). 3 ).

[0114] Environmental protection:

[0115] Examples 1-4 use a water-based macromolecular matrix with a low VOC content (1.0-1.3 g / L), which meets environmental protection standards and has no toxic effects on the environment (the lethal concentration for fish is >5000 ppm). Existing antibacterial wood coatings use organic solvents with a high VOC content (3.0 g / L) and are toxic to the environment to a certain extent (the lethal concentration for fish is 200 ppm), which does not meet environmental protection requirements.

[0116] The above embodiments of the present invention are not intended to limit the scope of protection of the present invention, and the implementation methods of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention based on the above contents of the present invention, in accordance with common technical knowledge and customary means in this field, without departing from the above basic technical ideas of the present invention, should fall within the scope of protection of the present invention.

Claims

1. An antibacterial wood coating based on water-based macromolecules, characterized in that: The invention comprises the following ingredients: aqueous macromolecular matrix, nano silver particles, nano copper particles, nano titanium dioxide, propolis extract, dispersant, surfactant, antioxidant, organosilicon compound, ultraviolet absorber, sodium polyacrylate, cross-linking agent and deionized water.

2. The antibacterial wood coating based on water-based macromolecule binding according to claim 1, characterized in that: The invention comprises the following components in weight percentage: 45%-55% of aqueous macromolecular matrix, 10%-15% of nano silver particles, 5%-10% of nano copper particles, 3%-5% of nano titanium dioxide, 1%-3% of propolis extract, 1%-5% of dispersant, 1%-3% of surfactant, 0.1%-0.5% of antioxidant, 2%-8% of organosilicon compound, 0.5%-2% of ultraviolet absorber, 2%-10% of sodium polyacrylate, 0.1%-0.5% of cross-linking agent, and the balance is deionized water.

3. The antibacterial wood coating based on water-based macromolecule binding according to claim 1, characterized in that: The aqueous macromolecular matrix is ​​polyvinyl alcohol, polyacrylic acid, polylactic acid or other water-soluble polymers.

4. The antibacterial wood coating based on water-based macromolecule binding according to claim 1, characterized in that: The dispersant is polyvinyl pyrrolidone or polyethylene oxide.

5. The antibacterial wood coating based on water-based macromolecule binding according to claim 1, characterized in that: The surfactant is sodium dodecylbenzenesulfonate; and the antioxidant is tocopherol.

6. The antibacterial wood coating based on water-based macromolecule binding according to claim 1, characterized in that: The organosilicon compound is polydimethylsiloxane or organosilane.

7. The antibacterial wood coating based on water-based macromolecule binding according to claim 1, characterized in that: The ultraviolet absorber is benzotriazole or zinc oxide.

8. The antibacterial wood coating based on water-based macromolecule binding according to claim 1, characterized in that: The cross-linking agent is glutaraldehyde or diisocyanate.

9. A method for preparing an antibacterial wood coating based on water-based macromolecules, characterized in that: The following steps are involved: Add the aqueous macromolecular matrix into deionized water, stir and heat until completely dissolved to obtain a uniform aqueous matrix solution; Nanoparticles such as silver nanoparticles, copper nanoparticles and titanium dioxide nanoparticles are mixed with deionized water by ultrasonic treatment, and are uniformly dispersed using a dispersant and a surfactant to prevent agglomeration of the particles; Add the propolis extract to the aqueous matrix solution and stir evenly to ensure that the propolis extract is fully dissolved or dispersed; Gradually add dispersed nano-silver particles, nano-copper particles and nano-titanium dioxide into the aqueous matrix solution, stir evenly, and add ultraviolet absorber and antioxidant; Sodium polyacrylate is added, followed by a cross-linking agent, and the cross-linking reaction is promoted while stirring to form a cross-linked network structure; Add the organosilicon compound and continue to stir the solution to ensure that all components are evenly distributed and react; After the reaction is completed, a filter is used to remove large particles or impurities in the solution, and then a stability test is performed to observe the dispersion of the nanoparticles in the solution and confirm whether there is precipitation or particle aggregation; The prepared antibacterial wood coating solution is placed in a suitable container and sealed for storage.

10. Application of an antibacterial wood coating based on water-based macromolecules in medical dressings, wound disinfection, and antibacterial treatment of medical device surfaces.

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