Antibacterial moisture-proof acrylic coating and preparation method thereof

Abstract

The invention relates to an antibacterial moisture-proof acrylic coating and a preparation method thereof, and belongs to the field of building coatings. The coating is prepared from the following raw materials in parts by weight: 30-50 parts of acrylic emulsion, 2-5 parts of a coalescing agent, 3-5 parts of a dispersing agent, 10-12 parts of water, 1-2 parts of a defoaming agent and 10-15 parts of antibacterial moisture-proof filler which is prepared by cutting polyurethane fiber cloth and soaking the cut polyurethane fiber cloth in chitosan lactate ethanol modified liquid. The preparation method comprises the following steps: cutting polyurethane fiber cloth, dipping the polyurethane fiber cloth in a modification liquid, and airing to obtain the filler; and mixing and stirring the filler, acrylic emulsion and other raw materials in proportion to obtain the coating. The cut polyurethane fiber cloth is soaked in the chitosan lactate modified liquid to prepare the antibacterial and moisture-proof filler, and then the coating is prepared. The coating has excellent moisture-proof and antibacterial properties, and due to the biological activity of the chitosan lactate and the moisture-proof characteristic of the polyurethane fiber cloth, the coating can be kept stable in a humid environment, moisture is effectively blocked, and growth of bacteria and molds is inhibited.

Description

Technical Field

[0001] The present application relates to the technical field of architectural coatings, and in particular to an antibacterial and moisture-proof acrylic coating and a preparation method thereof. Background Art

[0002] Acrylic paint has been widely used in many fields due to its excellent weather resistance, pollution resistance and convenient construction performance. However, in the face of humid environments or places where bacteria are easy to breed, the performance of traditional acrylic paint seems to be inadequate, especially in terms of antibacterial and moisture resistance.

[0003] Currently, most antibacterial coatings on the market rely on the addition of antibacterial agents, but the antibacterial effect of this method is often limited and difficult to sustain. As the use time increases, the antibacterial performance will gradually weaken.

[0004] In view of this situation, there is an urgent need to develop an acrylic coating that can simultaneously possess excellent antibacterial and efficient moisture-proof properties. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides an antibacterial and moisture-proof acrylic coating and a preparation method thereof. This new type of coating not only has long-lasting antibacterial properties, maintaining environmental hygiene and safety, but also can maintain the stability and durability of the coating in a humid environment, thereby extending its service life and reducing maintenance costs.

[0006] In the first aspect, the present application provides an antibacterial and moisture-proof acrylic coating using the following technical solutions: An antibacterial and moisture-proof acrylic paint, the raw materials used for preparation are measured by weight and include the following components: The antibacterial and moisture-proof filler is made by cutting polyurethane fiber cloth and immersing it in a modification liquid; the modification liquid comprises chitosan lactate and ethanol.

[0007] By adopting the above technical solution: the coating formula contains components such as acrylic emulsion, film-forming aid, dispersant, water and defoamer, and these components work together to make the coating easy to apply and dry quickly during the construction process, and the formed coating is uniform, smooth and free of bubbles. At the same time, the good compatibility between the components also ensures the stability of the coating during storage and use; In addition, the antibacterial and moisture-proof filler is prepared by immersing polyurethane fiber cloth in a modified liquid containing chitosan lactate. Chitosan lactate has good biological activity and antibacterial properties, and can effectively inhibit the growth of a variety of bacteria and molds, thereby keeping the coated surface clean and hygienic. Compared with traditional coatings that rely on the addition of antibacterial agents, this built-in antibacterial mechanism is more durable and effective, and is not easily weakened with prolonged use. At the same time, the polyurethane fiber cloth itself has excellent moisture-proof properties and can effectively block moisture penetration. Combined with its characteristics after being modified with chitosan lactate, the moisture-proof ability of the coating is further enhanced, which enables the coating to maintain stability and durability in a humid environment, avoiding problems such as coating shedding and blistering caused by moisture erosion.

[0008] Preferably, the raw materials used for preparation include the following components in parts by weight:

[0009] By adopting the above technical solution: the antibacterial and moisture-proof acrylic coating obtained by optimizing the raw material ratio has been significantly improved in terms of performance, workability, cost-effectiveness, etc., and is more in line with market demand and user expectations.

[0010] Preferably, the modified liquid also includes a nano-silver antibacterial agent.

[0011] By adopting the above technical solution: compounding the nano-silver antibacterial agent with chitosan lactate, the antibacterial and moisture-proof acrylic coating has been further improved in antibacterial performance.

[0012] Preferably, the content of chitosan lactate in the modified liquid accounts for 5-15% of the total weight of the modified liquid.

[0013] By adopting the above technical solution: an appropriate amount of chitosan lactate can effectively modify the polyurethane fiber cloth and improve its antibacterial and moisture-proof properties. The selection of this ratio can ensure that the fiber cloth fully absorbs chitosan lactate and exerts good performance in subsequent applications. At the same time, it has good compatibility with other components in the modified liquid (such as nanosilver antibacterial agent), ensuring the stability and uniformity of the modified liquid.

[0014] Preferably, the film-forming aid is selected from Dodecyl alcohol ester, Eastman Optifilm TM enhancer300 or WI6; the dispersant is selected from CARMOT DS-220 or SPERSE P-144; the defoamer is selected from SN-DEFOAMER 470, BASF FoamStar SI 2210 or BYK-012.

[0015] By adopting the above technical solution: the overall performance and construction efficiency of the antibacterial and moisture-proof acrylic coating can be significantly improved, ensuring that the coating has excellent physical properties and appearance quality when forming a coating film.

[0016] In a second aspect, the present application provides a method for preparing an antibacterial and moisture-proof acrylic coating using the following technical scheme: A method for preparing an antibacterial and moisture-proof acrylic paint comprises the following preparation steps: a. Cut the polyurethane fiber cloth, immerse it in a modification liquid containing chitosan lactate and ethanol, take it out and dry it after it is fully soaked, and obtain an antibacterial and moisture-proof filler; b. Mix the antibacterial and moisture-proof filler obtained in a with acrylic emulsion, film-forming aid, defoaming agent, dispersant and water according to the predetermined feeding amount, stir evenly to obtain the product.

[0017] By adopting the above technical solution: the antibacterial and moisture-proof acrylic coating obtained can maintain the stability and durability of the coating in a humid environment, effectively preventing bacterial growth and moisture penetration. At the same time, the coating also has excellent construction performance and environmental protection, and can meet the needs of different fields for high-performance coatings.

[0018] Preferably, the polyurethane fiber cloth in step a is cut into sheets with a size of 2 mm×1.5 mm×0.1 μm.

[0019] By adopting the above technical solution: smaller flaky fillers can be more evenly distributed in the coating, so that antibacterial components such as chitosan lactate can be more widely covered on the coating surface, reducing the flow and dripping of the coating during the construction process, thereby enhancing the overall antibacterial and moisture-proof effect of the coating, and at the same time, the specific surface area is significantly increased, so that more antibacterial components such as chitosan lactate can be attached to the filler surface, thereby improving the utilization rate of the antibacterial components and the antibacterial performance of the coating; In addition, the flake filler can better penetrate into the tiny pores of the substrate and form a closer bond with the substrate. This penetration helps the coating to solidify evenly and improves the density and adhesion of the coating. The edge effect of the flake filler can also enhance the mechanical locking effect between the coating and the substrate and improve the durability of the coating.

[0020] Preferably, in step a, after the polyurethane fiber cloth is cut, it is immersed in the modifying liquid for 30-60 minutes.

[0021] By adopting the above technical solution, it is possible to ensure that the fiber cloth can fully absorb chitosan lactate and other effective ingredients in the modified liquid, thereby achieving the best antibacterial and moisture-proof effect.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application prepares an antibacterial and moisture-proof filler by cutting a polyurethane fiber cloth and immersing it in a modified liquid containing chitosan lactate, and then prepares a coating, so that the coating not only has excellent moisture-proof performance, but also can effectively inhibit the growth of various bacteria. The biological activity and antibacterial properties of chitosan lactate, as well as the moisture-proof properties of the polyurethane fiber cloth itself, work together to enable the coating to maintain the stability and durability of the coating in a humid environment, effectively preventing moisture penetration and bacterial growth; 2. This application cuts the polyurethane fiber cloth into smaller flake fillers and allows them to fully absorb the effective ingredients in the modified liquid. The flake fillers can be more evenly distributed in the coating and better penetrate into the tiny pores of the substrate to form a closer bond with the substrate. This penetration helps the coating to solidify evenly and improves the density and adhesion of the coating. At the same time, the edge effect of the flake fillers can also enhance the mechanical locking effect between the coating and the substrate, thereby improving the durability of the coating. This allows the coating to maintain stable performance during long-term use and extend its service life; 3. The present application significantly improves the performance, construction properties, and cost-effectiveness of the antibacterial and moisture-proof acrylic coating by optimizing the raw material ratio. The good compatibility of components such as acrylic emulsion, film-forming aid, dispersant, water, and defoaming agent ensures the stability of the coating during storage and use. At the same time, the coating is easy to apply and dries quickly during construction, and the resulting coating is uniform, flat, and free of bubbles. This not only improves the construction efficiency of the coating, but also reduces costs, and is more in line with market demand and user expectations. DETAILED DESCRIPTION

[0023] The present application is further described in detail below in conjunction with the examples. Except for the special instructions below, the raw materials used in the present application are all common commercially available materials.

[0024] Performance testing: (I) Moisture-proof performance test: A 50×50 cm wooden board was used as the substrate, and the coating prepared in the embodiment or comparative example was thinly coated on the surface thereof, with the thickness maintained at 2 mm. The sample was then placed in a constant temperature and humidity test chamber, with the temperature controlled at 40° C. and the humidity at 95%. After 168 hours, the coating sample was observed for delamination, hollowing, shedding, etc., and the weight changes of the wooden board and the coating before and after the test were recorded, and the water absorption rate was calculated. (II) Antibacterial performance test: The wood board was used as the substrate, and the coating prepared in the embodiment or comparative example was thinly coated on the surface thereof, with the thickness maintained at 2 mm. Then the sample was placed in an accelerated aging box, with the temperature controlled at 25°C and the radiation intensity at 0.68 W / m 2 , the wavelength of ultraviolet light is 340nm, and it is taken out after 2 weeks and kept aside; 1×10 4The number of Escherichia coli ATCC 25922, 1×10 4 A number of Staphylococcus aureus ATCC 6538 were evenly inoculated on the paint sample and cultured in a humid environment at 37°C for 24-48 hours. After the culture was completed, the sample was rinsed with eluent, and the live bacteria culture count was performed to calculate the antibacterial rate.

[0025] Example 1 An antibacterial and moisture-proof acrylic paint is prepared by the following method using the following raw materials and amounts: 1. Cut the polyurethane fiber cloth into a sheet structure of 2 mm × 1.5 mm × 0.1 μm, then weigh 1 kg and immerse it in a modification solution containing chitosan lactate, nano-silver antibacterial agent and 20 kg ethanol. After fully soaking for 45 minutes, take it out and dry it to obtain an antibacterial and moisture-proof filler; Chitosan lactate accounts for 10% of the total weight of the modified liquid, nano silver antibacterial agent accounts for 5% of the total weight of the modified liquid, and the polyurethane fiber cloth comes from Huafeng Microfiber; 2. Mix the antibacterial and moisture-proof filler obtained in a with acrylic emulsion, film-forming aid, defoamer, dispersant and water according to the predetermined feeding amount and stir evenly to obtain; The film-forming aid is selected from Eastman Optifilm TM enhancer 300, dispersant selected from CARMOT DS-220, the defoaming agent is selected from BASF FoamStar SI 2210, and the nano-silver antibacterial agent is selected from the silver nano-cube of Xi'an Qiyue Biological, with a particle size of 50nm.

[0026] The coating prepared in Example 1 was tested for its performance according to the aforementioned test method, and the results are shown in the table below.

[0027] As can be seen from the above table, the coating prepared in Example 1 has excellent moisture-proof and antibacterial properties. After a long period of accelerated aging, the inhibition rates of Escherichia coli and Staphylococcus aureus remain at a high level, reaching 98.42% and 99.06% respectively, and no delamination, hollowing, shedding and other phenomena occur, and the water absorption rate is also maintained at a low level of 2.53%; Analyzing the reasons, it may be: The polyurethane fiber cloth itself has good strength and wear resistance. The tiny flake structure formed after careful cutting greatly increases its contact area with the coating matrix, allowing chitosan lactate and nano-silver antibacterial agent to adhere to the fiber cloth more effectively; Secondly, the tiny flake structure forms a support similar to a skeleton in the paint, which enhances the overall structural strength of the paint and helps prevent the paint from delamination, hollowing or falling off during long-term use. At the same time, since the fiber cloth itself has low water absorption, this structure also helps to reduce the water absorption rate of the paint, thereby improving its moisture-proof performance. Nano-silver antimicrobial agent is a highly effective antimicrobial agent with a small particle size and a large specific surface area. It can play a synergistic role when combined with chitosan lactate to more effectively contact and kill bacteria. The tiny sheet structure formed by the polyurethane fiber cloth provides more attachment points and diffusion channels for the antimicrobial ingredients (nano-silver antimicrobial agent and chitosan lactate complex), allowing it to be more evenly distributed in the coating and more effectively exert its antibacterial effect.

[0028] Embodiment 2-8 An antibacterial and moisture-proof acrylic paint, the raw materials and method used for its preparation are the same as those in Example 1, the only difference being that the amounts of the raw materials used are different, as shown in the table below.

[0029] The coatings prepared in the above Examples 2-8 were tested for their performance according to the above test method. The results are shown in the table below.

[0030] It can be seen from the above table that the antibacterial and moisture-proof acrylic coatings prepared in Examples 2-8 have good performance in moisture-proof and antibacterial properties, and no delamination, hollowing or falling off occurs. The water absorption rate is maintained in the range of 4.25-4.33%. After 2 weeks of accelerated aging test, the inhibition rate of Escherichia coli and Staphylococcus aureus is still maintained at more than 98%.

[0031] Examples 9-15 An antibacterial and moisture-proof acrylic paint, the raw materials and method used for its preparation are the same as those in Example 1, the only difference being that the amounts of the raw materials used are different, as shown in the table below.

[0032] Comparative Example 1 An antibacterial and moisture-proof acrylic paint is prepared by the following method using the same raw materials and amounts as in Example 1: a. Immerse 1 kg of polyurethane particles in a modified liquid containing chitosan lactate, nano-silver antibacterial agent and 20 kg of ethanol, and stir evenly to obtain an antibacterial and moisture-proof filler; Chitosan lactate accounts for 10% of the total weight of the modified liquid, nano-silver antibacterial agent accounts for 5% of the total weight of the modified liquid, and polyurethane particles come from DIC WATERSOLUD-4201; b. Mix the antibacterial and moisture-proof filler obtained in a with acrylic emulsion, film-forming aid, defoaming agent, dispersant and water according to the predetermined feeding amount, stir evenly to obtain the product.

[0033] The coatings prepared in the above Examples 9-15 and Comparative Example 1 were tested for their performance according to the above test method. The results are shown in the table below.

[0034] As can be seen from the above table, the antibacterial and moisture-proof acrylic coatings prepared by Examples 9-15 have good performance in moisture-proof and antibacterial properties, and no delamination, hollowing, or shedding occurs. The water absorption rate is maintained in the range of 3.29-3.54%. After 2 weeks of accelerated aging test, the inhibition rate of Escherichia coli and Staphylococcus aureus is still maintained at more than 98%, which shows that after the above component feeding amounts are optimized, the antibacterial and moisture-proof properties of the coating are gradually improved, and the performance of Example 1 in the present application is the best, which can be the most preferred embodiment; As for the coating prepared in Comparative Example 1, although there was no delamination, hollowing or falling off, its water absorption rate increased by 121.74% compared with the coating prepared in Example 1. At the same time, the inhibition rate of Escherichia coli and Staphylococcus aureus also decreased significantly, by 34.78% and 41.08% respectively; this may be because the antibacterial moisture-proof filler, one of the raw material components for its preparation, was directly prepared using polyurethane particles, rather than by cutting and immersing the polyurethane fiber cloth in Example 1. The structure of the fiber cloth may help to provide a better moisture-proof barrier, and the antibacterial components on the fiber surface can also more effectively contact and kill bacteria.

[0035] Example 16 An antibacterial and moisture-proof acrylic paint, the raw materials and amounts used in its preparation are the same as those in Example 1, and The following method is prepared: 1. Cut the polyurethane fiber cloth into a sheet structure of 2 mm × 1.5 mm × 0.1 μm, then weigh 1 kg and immerse it in a modification liquid containing chitosan lactate and 20 kg ethanol. After fully soaking for 45 minutes, take it out and dry it to obtain an antibacterial and moisture-proof filler; Chitosan lactate accounts for 15% of the total weight of the modified liquid; 2. Mix the antibacterial and moisture-proof filler obtained in a with acrylic emulsion, film-forming aid, defoaming agent, dispersant and water according to the predetermined feeding amount, stir evenly to obtain the product.

[0036] Embodiment 17 An antibacterial and moisture-proof acrylic paint, the raw materials and amounts used in its preparation are the same as those in Example 1, and The following method is prepared: 1. Cut the polyurethane fiber cloth into a sheet structure of 2 mm × 1.5 mm × 0.1 μm, then weigh 1 kg and immerse it in a modification solution containing chitosan lactate, nano-silver antibacterial agent and 20 kg ethanol. After fully soaking for 45 minutes, take it out and dry it to obtain an antibacterial and moisture-proof filler; The chitosan lactate accounts for 20% of the total weight of the modified liquid, and the nano-silver antibacterial agent accounts for 5% of the total weight of the modified liquid; 2. Mix the antibacterial and moisture-proof filler obtained in a with acrylic emulsion, film-forming aid, defoamer, dispersant and water according to the predetermined feeding amount and stir evenly to obtain; Embodiment 18 An antibacterial and moisture-proof acrylic paint, the raw materials and amounts used in its preparation are the same as those in Example 1, and The following method is prepared: a. Cut the polyurethane fiber cloth to form a sheet structure of 2 mm×1.5 mm×0.1 μm, then weigh 1 kg and immerse it in a modification solution containing chitosan lactate, nano-silver antibacterial agent and 20 kg ethanol, fully soak it for 45 minutes, then take it out and dry it to obtain an antibacterial and moisture-proof filler; The chitosan lactate accounts for 1% of the total weight of the modified liquid, and the nano-silver antibacterial agent accounts for 5% of the total weight of the modified liquid; b. Mix the antibacterial and moisture-proof filler obtained in a with acrylic emulsion, film-forming aid, defoamer, dispersant and water according to the predetermined feeding amount, and stir evenly to obtain; The coatings prepared in the above Examples 16-18 were tested for their performance according to the above test method. The results are shown in the table below.

[0037] As can be seen from the above table, the antibacterial and moisture-proof acrylic coatings prepared by Examples 16-18 have good moisture-proof properties, without delamination, hollowing, shedding and the like, and the water absorption rate is maintained at a relatively low level of 2.57-2.68%. In terms of antibacterial properties, compared with Example 1, the antibacterial rate is slightly decreased, but the overall performance is still excellent, which indicates that the content of chitosan lactate is 5-15% of the total weight of the modified liquid, which is a preferred range.

[0038] Embodiment 19 An antibacterial and moisture-proof acrylic paint is prepared by using the same raw material amounts as in Example 1, with the only difference being that the polyurethane fiber cloth in step a is cut into sheets of 4 mm×3 mm×0.2 μm.

[0039] Embodiment 20 An antibacterial and moisture-proof acrylic paint is prepared by using the same raw material amounts as in Example 1, with the only difference being that the polyurethane fiber cloth in step a is cut into sheets of 1 mm×0.75 mm×0.05 μm.

[0040] The coatings prepared in the above Examples 19-20 were tested for their performance according to the above test method. The results are shown in the table below.

[0041] As can be seen from the above table, the antibacterial and moisture-proof acrylic coatings prepared in Examples 19-20 have a certain degree of decline in moisture-proof performance and antibacterial performance compared with Example 1, and even slight stratification and a small amount of shedding phenomena occurred in Example 19, and the water absorption rate increased by 132.81%, the inhibition rate of Escherichia coli decreased by 13.16%, and the inhibition rate of Staphylococcus aureus decreased by 12.22%; In Example 20, the water absorption rate increased by 132.01%, the inhibition rate against Escherichia coli decreased by 10.26%, and the inhibition rate against Staphylococcus aureus decreased by 9.98%; The above results show that the polyurethane fiber cloth is preferably cut into a sheet with a size of 2 mm×1.5 mm×0.1 μm.

[0042] The above are all modifications without creative contribution or solutions that obviously constitute technical inspiration that can be made to the present embodiment as needed by technical personnel in this field after reading this specification, but they should be protected by patent law as long as they are within the scope of the claims of this application.

Claims

1. An antibacterial and moisture-proof acrylic coating, characterized in that: The raw materials used for the preparation are measured by weight and include the following components: Acrylic emulsion 30-50 parts 2-5 parts of film-forming aid Dispersant 3-5 parts 10-12 parts water 1-2 parts of defoamer 10-15 parts of antibacterial and moisture-proof filler; The antibacterial and moisture-proof filler is made by cutting polyurethane fiber cloth and immersing it in a modification liquid; the modification liquid comprises chitosan lactate and ethanol.

2. The antibacterial and moisture-proof acrylic paint according to claim 1, characterized in that: The raw materials used for the preparation are measured by weight and include the following components: Acrylic emulsion 35-45 parts 2-5 parts of film-forming aid Dispersant 3-5 parts 8-12 parts water 1-2 parts of defoamer 12-15 parts of antibacterial and moisture-proof filler.

3. The antibacterial and moisture-proof acrylic paint according to claim 1, characterized in that: The modified liquid also includes a nano silver antibacterial agent.

4. The antibacterial and moisture-proof acrylic paint according to claim 1, characterized in that: The content of chitosan lactate in the modified liquid accounts for 5-15% of the total weight of the modified liquid.

5. The antibacterial and moisture-proof acrylic paint according to claim 1, characterized in that: The film-forming aid is selected from RTC®-12 dodecanol ester, Eastman Optifilm TM enhancer 300 or LOCA® WI6; the dispersant is selected from CARMOT DS-220 or UNIQ® SPERSE P-144; the defoamer is selected from SN-DEFOAMER 470, BASF FoamStar SI 2210 or BYK-012.

6. The method for preparing the antibacterial and moisture-proof acrylic coating according to any one of claims 1 to 5, characterized in that: The method comprises the following preparation steps: a. Cut the polyurethane fiber cloth, immerse it in a modification liquid containing chitosan lactate and ethanol, take it out and dry it after it is fully soaked, and obtain an antibacterial and moisture-proof filler; b. Mix the antibacterial and moisture-proof filler obtained in a with acrylic emulsion, film-forming aid, defoaming agent, dispersant and water according to the predetermined feeding amount, stir evenly to obtain the product.

7. The method for preparing the antibacterial and moisture-proof acrylic coating according to claim 6, characterized in that: The polyurethane fiber cloth in step a is cut into sheets with a size of 2 mm×1.5 mm×0.1 μm.

8. The method for preparing the antibacterial and moisture-proof acrylic coating according to claim 6, characterized in that: After the polyurethane fiber cloth is cut in step a, it is immersed in the modifying liquid for 30-60 minutes.

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