Antibacterial and formaldehyde-removing artistic paint and preparation method thereof

Abstract

The present application relates to the field of coatings, and specifically discloses an antibacterial and formaldehyde-removing artistic coating and a preparation method thereof. The artistic coating includes the following components by weight: 30-40 parts of water-based acrylic emulsion; 0.3-1 parts of nanosilver; 1-3 parts of formaldehyde remover; 2-4 parts of auxiliary agent; 6-8 parts of filler; 18-23 parts of titanium dioxide; 20-30 parts of water; the preparation process of the formaldehyde remover is as follows: S1 bamboo powder preparation: bamboo material is cleaned, sliced, crushed, and passed through a 50-mesh sieve to obtain bamboo powder; S2 acid hydrolysis; S3 alkali treatment; S4 nano bamboo fiber preparation; S5 bamboo fiber loading. The formaldehyde remover of the present application is a functional composite type. On the one hand, it has the functions of adsorption and reaction formaldehyde removal, and the comprehensive formaldehyde removal effect is better than that of traditional activated carbon. On the other hand, the formaldehyde remover has excellent formaldehyde removal performance in the formaldehyde high-speed release temperature range of 30-40°C, and can achieve more formaldehyde emission and more absorption, meeting the environmental protection needs of high-end home decoration.

Description

Technical Field

[0001] The present application relates to the field of coatings, and more specifically, to an antibacterial and formaldehyde-removing artistic coating and a preparation method thereof. Background Art

[0002] Artistic paint is a kind of interior wall architectural paint that can be painted with various textures to achieve a wallpaper-like decorative effect with good decorative properties. As an upgraded product of interior wall latex paint, the market share of artistic paint has been expanding in recent years and is loved by consumers.

[0003] Artistic paint mainly contains the following components: polymer resin, pigment, filler, additives and water. Additives are divided into dispersants, leveling agents, preservatives, film-forming additives, etc., which are configured according to the characteristics of different paint products.

[0004] As the requirements for indoor environment increase, traditional coatings can no longer meet the demand. Multifunctional coatings have gradually become a development trend in the decoration industry, such as antibacterial, mildew-proof, absorption and decomposition of formaldehyde, release of negative ions, etc., making coatings suitable for various specific places or meeting high-end decoration needs. In order to achieve the antibacterial function, inorganic antibacterial agents such as nanosilver and titanium dioxide are generally added to the coating; in order to achieve the formaldehyde removal function, activated carbon is generally added to the coating as a formaldehyde removal agent to absorb formaldehyde.

[0005] However, the current formaldehyde-removing coatings have the following technical defects: the adsorption capacity of activated carbon is strongly correlated with temperature. On the one hand, the adsorption capacity is not strong in the suitable temperature range for formaldehyde release; on the other hand, it is easily affected by temperature and desorbed, releasing formaldehyde and other harmful substances back into the air, causing secondary pollution, which needs to be improved. Summary of the invention

[0006] In order to improve the formaldehyde removal performance of the coating, the present application provides an antibacterial formaldehyde removal type artistic coating and a preparation method thereof.

[0007] In the first aspect, the present application provides an antibacterial and formaldehyde-removing artistic coating, which adopts the following technical solution:

[0008] An antibacterial and formaldehyde-removing artistic paint comprises the following components in parts by weight:

[0009] 30-40 parts of water-based acrylic emulsion;

[0010] Nano silver 0.3-1 part;

[0011] 1-3 parts of formaldehyde remover;

[0012] 2-4 parts of additives;

[0013] 6-8 parts of filler;

[0014] 18-23 parts of titanium dioxide;

[0015] 20-30 parts water;

[0016] The preparation process of the formaldehyde remover is as follows:

[0017] S1 Preparation of bamboo powder: The bamboo material is cleaned, sliced, crushed, and passed through a 50-mesh sieve to obtain bamboo powder;

[0018] S2 acid hydrolysis: immerse the bamboo powder in a 3-4wt% hydrochloric acid solution at a temperature of 60-70°C, treat for 40-60 minutes, filter, wash and dry to obtain acid-hydrolyzed bamboo fiber;

[0019] S3 alkali treatment: immerse the acid-hydrolyzed bamboo fiber in 8-10wt% sodium hydroxide solution to remove lignin at a temperature of 100-120°C, treat for 20-30 minutes, filter, wash and dry to obtain purified bamboo fiber;

[0020] S4 Preparation of nano bamboo fiber: Disperse 100-120 parts of purified bamboo fiber in water by weight, stir evenly, add 70-90 parts of 30-40wt% sodium bromide solution and 20-30 parts of 10-15wt% TEMPO solution, then dropwise add 15-20 parts of 1-1.5wt% sodium hypochlorite solution, and control the pH value to 10-11. After reacting for 1-2h, filter, wash, dry, and ball-mill to obtain nano bamboo fiber with a size of 30-50nm;

[0021] S5 bamboo fiber loading: by weight, 50-60 parts of nano bamboo fiber and 500-600 parts of formaldehyde capture agent are mixed evenly, heated to 70-80°C, refluxed for 6-12 hours, filtered, washed with water, and dried to obtain a formaldehyde remover.

[0022] By adopting the above technical solution, the paint uses water-based acrylic emulsion as a film-forming substance and water as a solvent, has a low VOCs content, is more environmentally friendly, and helps to improve the environmental performance of the paint. In addition, the water-based acrylic emulsion has good adhesion to a variety of substrates, which is conducive to the formation of a uniform protective layer of nanosilver and formaldehyde removers on the wall. The water-based acrylic emulsion has good compatibility with nanosilver and formaldehyde removers, and the formed coating has good air permeability, which helps the formaldehyde remover to play a role and maintain indoor air quality.

[0023] Nanosilver has a broad spectrum of antibacterial properties, can bind to bacterial plasma membranes, penetrate cells, induce the synthesis of reactive oxygen species (ROS) and free radicals, and interfere with cell signal transduction pathways, thereby destroying bacterial cell structure and function, leading to bacterial death. In addition, nanosilver has little effect on the gloss and haze of the coating. Although the gloss may be slightly reduced, the overall aesthetics of the coating is maintained, making it suitable for use in artistic coatings.

[0024] The formaldehyde remover uses bamboo as raw material. It is first treated with acid and alkali to remove impurities such as lignin, increase the physical properties of the fiber, and improve its affinity with the polymer. It is then treated with TEMPO oxidation to oxidize the hydroxyl groups on the surface of cellulose into carboxyl groups. The ionization effect of the carboxyl groups is used to form a double layer repulsion between the fibers, which further disperses the bamboo fibers to obtain nano bamboo fibers with good dispersion, large aspect ratio, large porosity, strong adsorption capacity, and large loading capacity. Finally, the formaldehyde capture agent is loaded on the nano bamboo fibers.

[0025] The formaldehyde remover of the present application is of a functional composite type. On the one hand, it has the functions of both formaldehyde removal by adsorption and formaldehyde removal by reaction, and its comprehensive formaldehyde removal effect is better than that of traditional activated carbon. On the other hand, the formaldehyde remover has excellent formaldehyde removal performance in the formaldehyde high-speed release temperature range of 30-40°C, and can achieve more formaldehyde emission and absorption, meeting the environmental protection needs of high-end home decoration.

[0026] Optionally, the formaldehyde capture agent is a 2-imidazolidinone solution with a concentration of 2-2.5 mol / L.

[0027] By adopting the above technical solution, after formaldehyde is adsorbed by the nano bamboo fiber, it reacts with the 2-imidazolidinone carried by it, achieving stable capture without releasing formaldehyde again to pollute the environment, effectively overcoming the defects of traditional adsorption-type formaldehyde removers. In addition, compared with other types of formaldehyde capture agents, 2-imidazolidinone has a high affinity with nano bamboo fiber, allowing the nano bamboo fiber to load more formaldehyde capture agents.

[0028] Optionally, 3-5 parts by weight of tea polyphenols are also added to the S5 bamboo fiber load.

[0029] The adoption of the above technical solution is beneficial to increasing the loading amount of the formaldehyde capture agent and further improving the comprehensive formaldehyde removal ability of the formaldehyde removal agent.

[0030] Optionally, the auxiliary agent includes a dispersant, a leveling agent, an adhesion promoter and a photocatalyst in a mass ratio of (2-5): (2-5): (1-3): (1-2).

[0031] By adopting the above technical solutions, the dispersant can help the formaldehyde remover, nanosilver and filler to disperse efficiently, thereby ensuring the comprehensive formaldehyde removal and antibacterial ability of the coating. The leveling agent can reduce the surface tension of the coating, making it easier to spread on the substrate, reducing the unevenness of the coating surface, thereby improving the smoothness and uniformity of the coating. By improving the leveling property, the leveling agent can improve the decorative effect of the coating, while enhancing the protective performance of the coating and extending the service life of the coating. The adhesion promoter can significantly enhance the adhesion between the coating and the substrate by improving the interfacial tension between the coating and the substrate, so that the coating is more closely in contact with the substrate, ensuring that the coating is firmly attached to various substrates, and improving the problem of decreased adhesion due to the addition of formaldehyde removers. The photocatalyst works synergistically with nanosilver and formaldehyde removers to decompose harmful substances in the air, such as formaldehyde, benzene, TVOC, etc., and convert them into harmless water and carbon dioxide, thereby purifying the air.

[0032] Optionally, the preparation process of the dispersant is as follows: by weight, first mix 40-50 parts of styrene, 2-3 parts of benzyl dithiobenzoate and 0.4-0.6 parts of azobisisobutyronitrile, then add 0.2-0.3 parts of tetrahydrofuran, heat to 100-120°C under nitrogen protection, react for 2-3 hours, then cool to room temperature, add 200-300 parts of acrylic acid and 1-1.2 parts of azobisisobutyronitrile, heat to 70-80°C under nitrogen protection, react for 1-2 hours to obtain a polymer, and finally put the polymer into petroleum ether and anhydrous ether with a volume ratio of 1:1 to precipitate, and then filter, wash with water, and dry to obtain a dispersant.

[0033] By adopting the above technical solution, the dispersant is particularly suitable for dispersing the formaldehyde removal agent of the present application, compared with common commercially available dispersants.

[0034] Optionally, the leveling agent is of fluorocarbon type.

[0035] By adopting the above technical scheme, a coating system suitable for using water-based acrylic emulsion as a film-forming substance is obtained.

[0036] Optionally, the adhesion promoter is a silane coupling agent.

[0037] By adopting the above technical solution, the silane coupling agent can improve the adhesion of the polymer to the inorganic substrate, increase the strength of the coating film, and help disperse the formaldehyde removal agent.

[0038] Optionally, the photocatalyst is 30-50nm nano titanium dioxide.

[0039] By adopting the above technical solution, nano titanium dioxide not only has photocatalytic properties and can degrade formaldehyde, but also can absorb and scatter ultraviolet rays, protect the coating from ultraviolet rays and extend the service life of the coating. In addition, nano titanium dioxide can improve the adhesion, flexibility and impact resistance of the coating film.

[0040] Optionally, the filler is a mixture of talcum powder and light calcium carbonate in equal mass ratio.

[0041] By adopting the above technical solution, talcum powder and light calcium carbonate are compounded as fillers to improve the mechanical properties of the coating.

[0042] In a second aspect, the present application provides a method for preparing an antibacterial and formaldehyde-removing artistic coating, using the following technical solution:

[0043] A method for preparing an antibacterial and formaldehyde-removing artistic paint comprises the following steps: mixing water-based acrylic emulsion, nano silver, formaldehyde-removing agent, auxiliary agent, filler and water according to the required weight parts of the formula to obtain the antibacterial and formaldehyde-removing artistic paint.

[0044] By adopting the above technical solution, the preparation method is simple and fast.

[0045] In summary, this application has the following beneficial effects:

[0046] 1. The formaldehyde remover of the present application is a functional composite type. On the one hand, it has the functions of both adsorption and reaction to remove formaldehyde, and its comprehensive formaldehyde removal effect is better than that of traditional activated carbon. On the other hand, the formaldehyde remover has excellent formaldehyde removal performance in the formaldehyde high-speed release temperature range of 30-40°C, and can achieve more formaldehyde emission and absorption, meeting the environmental protection needs of high-end home decoration.

[0047] 2. In the present application, 2-imidazolidinone is preferably used as a formaldehyde capture agent. Compared with other types of formaldehyde capture agents, 2-imidazolidinone has a high affinity with nano bamboo fiber, so that the nano bamboo fiber can carry more formaldehyde capture agents. After formaldehyde is adsorbed by the nano bamboo fiber, it reacts with the 2-imidazolidinone carried by it, achieving stable capture without releasing formaldehyde again to pollute the environment, effectively overcoming the defects of traditional adsorption-type formaldehyde removal agents. DETAILED DESCRIPTION

[0048] The present application is further described in detail below in conjunction with the examples. It is particularly noted that if no specific conditions are specified in the following examples, the experiments are carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following examples can be obtained from common commercial sources.

[0049] The examples of this application use the following raw materials:

[0050] The model of the water-based acrylic emulsion is Acronal ECO 7653, purchased from BASF; the average particle size of the nano-silver is 50 nm; and the model of the leveling agent is EFKA FL 3777 AN, purchased from BASF.

[0051] Preparation Example 1:

[0052] The preparation process of the formaldehyde remover is as follows:

[0053] S1 Preparation of bamboo powder: The bamboo material is cleaned, sliced, crushed, and passed through a 50-mesh sieve to obtain bamboo powder;

[0054] S2 acid hydrolysis: immerse the bamboo powder in a 3wt% hydrochloric acid solution at 60°C for 40 minutes, filter, wash and dry to obtain acid-hydrolyzed bamboo fiber;

[0055] S3 alkali treatment: immerse the acid-hydrolyzed bamboo fiber in 8wt% sodium hydroxide solution to remove lignin at a temperature of 100°C, treat for 20 minutes, filter, wash and dry to obtain purified bamboo fiber;

[0056] S4 Preparation of nano bamboo fiber: 100 kg of purified bamboo fiber was dispersed in water, stirred evenly, and then 70 kg of 30 wt% sodium bromide solution and 20 kg of 10 wt% TEMPO solution were added, and then 15 kg of 1 wt% sodium hypochlorite solution was added dropwise, and the pH value was controlled at 10. After reacting for 1 hour, the mixture was filtered, washed with water, dried, and ball-milled to obtain nano bamboo fiber with a size of 30 nm.

[0057] S5 bamboo fiber loading: 50 kg of nano bamboo fiber and 500 kg of 2-imidazolidinone solution with a concentration of 2 mol / L were mixed evenly, heated to 70°C, refluxed for 6 hours, filtered, washed with water, and dried to obtain a formaldehyde remover.

[0058] Preparation Example 2:

[0059] The preparation process of the formaldehyde remover is as follows:

[0060] S1 Preparation of bamboo powder: The bamboo material is cleaned, sliced, crushed, and passed through a 50-mesh sieve to obtain bamboo powder;

[0061] S2 acid hydrolysis: immerse the bamboo powder in a 4wt% hydrochloric acid solution at 70°C, treat for 60 minutes, filter, wash and dry to obtain acid-hydrolyzed bamboo fiber;

[0062] S3 alkali treatment: immerse the acid-decomposed bamboo fiber in a 10wt% sodium hydroxide solution to remove lignin at a temperature of 120°C, treat for 30 minutes, filter, wash and dry to obtain purified bamboo fiber;

[0063] S4 Preparation of nano bamboo fiber: 120 kg of purified bamboo fiber was dispersed in water, stirred evenly, and then 90 kg of 40 wt% sodium bromide solution and 30 kg of 15 wt% TEMPO solution were added, and then 20 kg of 1.5 wt% sodium hypochlorite solution was added dropwise, and the pH value was controlled at 11. After reacting for 2 hours, the mixture was filtered, washed with water, dried, and ball-milled to obtain nano bamboo fiber with a size of 50 nm.

[0064] S5 bamboo fiber loading: 60 kg of nano bamboo fiber and 600 kg of 2-imidazolidinone solution with a concentration of 2.5 mol / L were mixed evenly, heated to 80°C, refluxed for 12 hours, filtered, washed with water, and dried to obtain a formaldehyde remover.

[0065] Preparation Example 3:

[0066] The preparation process of the formaldehyde remover is as follows:

[0067] S1 Preparation of bamboo powder: The bamboo material is cleaned, sliced, crushed, and passed through a 50-mesh sieve to obtain bamboo powder;

[0068] S2 acid hydrolysis: immerse the bamboo powder in a 3.5wt% hydrochloric acid solution at 65°C for 50 minutes, filter, wash and dry to obtain acid-hydrolyzed bamboo fiber;

[0069] S3 alkali treatment: immerse the acid-hydrolyzed bamboo fiber in 9wt% sodium hydroxide solution to remove lignin at a temperature of 110°C, treat for 25 minutes, filter, wash and dry to obtain purified bamboo fiber;

[0070] S4 Preparation of nano bamboo fiber: 110 kg of purified bamboo fiber was dispersed in water, stirred evenly, and then 80 kg of 35 wt% sodium bromide solution and 25 kg of 12 wt% TEMPO solution were added, and then 18 kg of 1.2 wt% sodium hypochlorite solution was added dropwise, and the pH value was controlled at 10.5. After reacting for 1.5 h, the mixture was filtered, washed with water, dried, and ball-milled to obtain nano bamboo fiber with a size of 40 nm.

[0071] S5 bamboo fiber loading: 55 kg of nano bamboo fiber and 550 kg of 2-imidazolidinone solution with a concentration of 2.2 mol / L were mixed evenly, heated to 75°C, refluxed for 8 hours, filtered, washed with water, and dried to obtain a formaldehyde remover.

[0072] Preparation Example 4:

[0073] The only difference from Preparation Example 3 is that the mass of 2-imidazolidinone solution is replaced by thiourea solution with a concentration of 2 mol / L.

[0074] Preparation Example 5:

[0075] The only difference from Preparation Example 3 is that 3 kg of tea polyphenols are also added to the S5 bamboo fiber load.

[0076] Preparation Example 6:

[0077] The only difference from Preparation Example 3 is that 5 kg of tea polyphenols are also added to the S5 bamboo fiber load.

[0078] Preparation Example 7:

[0079] The preparation process of the dispersant is as follows: first mix 40kg of styrene, 2kg of benzyl dithiobenzoate and 0.4kg of azobisisobutyronitrile, then add 0.2kg of tetrahydrofuran, heat to 100°C under nitrogen protection, react for 2h, then cool to room temperature, add 200kg of acrylic acid and 1kg of azobisisobutyronitrile, heat to 70°C under nitrogen protection, react for 1h to obtain a polymer, and finally put the polymer into petroleum ether and anhydrous ether with a volume ratio of 1:1 to precipitate, and then filter, wash with water, and dry to obtain a dispersant.

[0080] Preparation Example 8:

[0081] The preparation process of the dispersant is as follows: first mix 50kg of styrene, 3kg of benzyl dithiobenzoate and 0.6kg of azobisisobutyronitrile, then add 0.3kg of tetrahydrofuran, heat to 120°C under nitrogen protection, react for 3h, then cool to room temperature, add 300kg of acrylic acid and 1.2kg of azobisisobutyronitrile, heat to 80°C under nitrogen protection, react for 2h to obtain a polymer, and finally put the polymer into petroleum ether and anhydrous ether with a volume ratio of 1:1 to precipitate, and then filter, wash with water, and dry to obtain a dispersant.

[0082] Preparation Example 9:

[0083] The preparation process of the dispersant is as follows: first mix 45kg of styrene, 2.5kg of benzyl dithiobenzoate and 0.5kg of azobisisobutyronitrile, then add 0.25kg of tetrahydrofuran, heat to 110°C under nitrogen protection, react for 2.53h, then cool to room temperature, add 250kg of acrylic acid and 1.1kg of azobisisobutyronitrile, heat to 75°C under nitrogen protection, react for 1.5h to obtain a polymer, and finally put the polymer into petroleum ether and anhydrous ether with a volume ratio of 1:1 to precipitate, and then filter, wash with water, and dry to obtain a dispersant.

[0084] Embodiment 1:

[0085] An antibacterial and formaldehyde-removing artistic paint comprises the following components:

[0086] Water-based acrylic emulsion 30kg;

[0087] Nanosilver 0.3kg;

[0088] 1 kg of formaldehyde removal agent, prepared in Preparation Example 1;

[0089] 2 kg of auxiliary agent, which includes the dispersant prepared in Preparation Example 7, a fluorocarbon leveling agent, KH570 and nano titanium dioxide with an average particle size of 30 nm in a mass ratio of 2:2:1:1;

[0090] 6kg of filler, which is a mixture of talcum powder and light calcium carbonate in equal mass ratio;

[0091] Titanium dioxide 18kg;

[0092] 20kg of water.

[0093] A method for preparing an antibacterial and formaldehyde-removing artistic paint comprises the following steps: according to the above formula, mixing water-based acrylic emulsion, nano silver, formaldehyde-removing agent, auxiliary agent, filler and water to obtain the antibacterial and formaldehyde-removing artistic paint.

[0094] Embodiment 2:

[0095] An antibacterial and formaldehyde-removing artistic paint comprises the following components:

[0096] Water-based acrylic emulsion 40kg;

[0097] Nanosilver 1kg;

[0098] 3 kg of formaldehyde removal agent, prepared in Preparation Example 2;

[0099] 4 kg of auxiliary agent, which includes the dispersant prepared in Preparation Example 8, a fluorocarbon leveling agent, KH570 and nano titanium dioxide with an average particle size of 50 nm in a mass ratio of 5:5:3:2;

[0100] 8kg of filler, which is a mixture of talcum powder and light calcium carbonate in equal mass ratio;

[0101] Titanium dioxide 23kg;

[0102] 30kg of water.

[0103] A method for preparing an antibacterial and formaldehyde-removing artistic paint comprises the following steps: according to the above formula, mixing water-based acrylic emulsion, nano silver, formaldehyde-removing agent, auxiliary agent, filler and water to obtain the antibacterial and formaldehyde-removing artistic paint.

[0104] Embodiment 3:

[0105] An antibacterial and formaldehyde-removing artistic paint comprises the following components:

[0106] Water-based acrylic emulsion 35kg;

[0107] Nanosilver 0.5kg;

[0108] 2 kg of formaldehyde removal agent, prepared in Preparation Example 3;

[0109] 3 kg of auxiliary agent, which includes the dispersant prepared in Preparation Example 9, a fluorocarbon leveling agent, KH570 and nano titanium dioxide with an average particle size of 40 nm in a mass ratio of 3:3:2:1;

[0110] 7kg of filler, which is a mixture of talcum powder and light calcium carbonate in equal mass ratio;

[0111] Titanium dioxide 20kg;

[0112] 25kg of water.

[0113] A method for preparing an antibacterial and formaldehyde-removing artistic paint comprises the following steps: according to the above formula, mixing water-based acrylic emulsion, nano silver, formaldehyde-removing agent, auxiliary agent, filler and water to obtain the antibacterial and formaldehyde-removing artistic paint.

[0114] Embodiment 4:

[0115] The only difference from Example 3 is that the formaldehyde scavenger is prepared by Preparation Example 4.

[0116] Embodiment 5:

[0117] The only difference from Example 3 is that the formaldehyde scavenger is prepared by Preparation Example 5.

[0118] Embodiment 6:

[0119] The only difference from Example 3 is that the formaldehyde scavenger is prepared by Preparation Example 6.

[0120] Embodiment 7:

[0121] The only difference from Example 3 is that the mass of the dispersant is replaced by sodium dodecylbenzene sulfonate.

[0122] Embodiment 8:

[0123] The only difference from Example 3 is that no adhesion promoter KH570 is added to the auxiliary agent.

[0124] Comparative Example 1:

[0125] The only difference from Example 3 is that no formaldehyde scavenger is added.

[0126] Comparative Example 2:

[0127] The only difference from Example 3 is that no nanosilver is added.

[0128] Comparative Example 3:

[0129] The only difference from Example 3 is that the preparation of S4 nano bamboo fiber is not included in the preparation process of the formaldehyde remover, and purified bamboo fiber is used instead of nano bamboo fiber in the S5 bamboo fiber loading.

[0130] Comparative Example 4:

[0131] The only difference from Example 3 is that purified bamboo fiber is used as the formaldehyde remover.

[0132] Comparative Example 5:

[0133] The only difference from Example 3 is that activated carbon is used as the formaldehyde removal agent.

[0134] Performance testing:

[0135] Adhesion test: referring to the method described in GB / T 9286-2021 "Scratch test for paints and varnishes", the coatings of Examples 1-7 and Comparative Examples 1-5 were tested for adhesion. The test plate used in the test was made of cement, and the coating thickness was 200 μm. The measured results were graded from 0 to 5, with grade 0 indicating the best adhesion and grade 5 indicating the worst adhesion. The results are recorded in Table 1.

[0136] Antibacterial rate test: Referring to the method described in GB / T 21866-2008 "Determination of antibacterial properties and antibacterial effects of antibacterial coatings (paint films)", the antibacterial rate test was performed on the coatings of Examples 1-7 and Comparative Examples 1-5. The test bacteria was Escherichia coli ATCC25922. The results are recorded in Table 1.

[0137] Formaldehyde removal rate test: Referring to the method described in JC / T 1074-2021 "Purification Performance of Indoor Air Purification Functional Coating Materials", the coatings of Examples 1-7 and Comparative Examples 1-5 were tested for formaldehyde removal rates. The coating thickness was 200 μm, and the formaldehyde purification efficiency was measured at indoor temperatures of 5°C, 15°C, 25°C, and 35°C, respectively. The results are recorded in Table 1.

[0138] Table 1 Coating test result record

[0139]

[0140] From Table 1, we can get:

[0141] 1. The antibacterial and formaldehyde-removing artistic paint of the present application has good adhesion, high antibacterial rate and formaldehyde-removing rate, is suitable for high-end decoration, and meets the needs of indoor environmental protection;

[0142] 2. By using nano bamboo fiber loaded with formaldehyde capture agent as a formaldehyde remover, the artistic paint of the present application has good formaldehyde removal performance at an indoor temperature of 5-35°C, especially at 35°C where formaldehyde is more volatile, thereby maintaining indoor air quality in summer;

[0143] 3. The bamboo fiber is treated with TEMPO oxidation, 2-imidazolidinone is used as the formaldehyde capture agent, and tea polyphenols are added to the bamboo fiber load, all of which can increase the loading capacity of the bamboo fiber, thereby improving the formaldehyde removal performance of the formaldehyde remover.

[0144] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. An antibacterial and formaldehyde-removing artistic paint, characterized in that: The composition comprises the following components in parts by weight: 30-40 parts of water-based acrylic emulsion; Nano silver 0.3-1 part; 1-3 parts of formaldehyde remover; 2-4 parts of additives; 6-8 parts of filler; 18-23 parts of titanium dioxide; 20-30 parts water; The preparation process of the formaldehyde remover is as follows: S1 Preparation of bamboo powder: The bamboo material is cleaned, sliced, crushed, and passed through a 50-mesh sieve to obtain bamboo powder; S2 acid hydrolysis: immerse the bamboo powder in a 3-4wt% hydrochloric acid solution at a temperature of 60-70°C, treat for 40-60 minutes, filter, wash and dry to obtain acid-hydrolyzed bamboo fiber; S3 alkali treatment: immerse the acid-hydrolyzed bamboo fiber in 8-10wt% sodium hydroxide solution to remove lignin at a temperature of 100-120°C, treat for 20-30 minutes, filter, wash and dry to obtain purified bamboo fiber; S4 Preparation of nano bamboo fiber: Disperse 100-120 parts of purified bamboo fiber in water by weight, stir evenly, add 70-90 parts of 30-40wt% sodium bromide solution and 20-30 parts of 10-15wt% TEMPO solution, then dropwise add 15-20 parts of 1-1.5wt% sodium hypochlorite solution, and control the pH value to 10-11. After reacting for 1-2h, filter, wash, dry, and ball-mill to obtain nano bamboo fiber with a size of 30-50nm; S5 bamboo fiber loading: by weight, 50-60 parts of nano bamboo fiber and 500-600 parts of formaldehyde capture agent are mixed evenly, heated to 70-80°C, refluxed for 6-12 hours, filtered, washed with water, and dried to obtain a formaldehyde remover.

2. The antibacterial and formaldehyde-removing artistic paint according to claim 1, characterized in that: The formaldehyde capture agent is a 2-imidazolidinone solution with a concentration of 2-2.5 mol / L.

3. The antibacterial and formaldehyde-removing artistic paint according to claim 2, characterized in that: 3-5 parts by weight of tea polyphenols are also added to the S5 bamboo fiber load.

4. The antibacterial and formaldehyde-removing artistic paint according to claim 1, characterized in that: The auxiliary agent includes a dispersant, a leveling agent, an adhesion promoter and a photocatalyst in a mass ratio of (2-5): (2-5): (1-3): (1-2).

5. The antibacterial and formaldehyde-removing artistic paint according to claim 4, characterized in that: The preparation process of the dispersant is as follows: by weight, 40-50 parts of styrene, 2-3 parts of benzyl dithiobenzoate and 0.4-0.6 parts of azobisisobutyronitrile are first mixed, and then 0.2-0.3 parts of tetrahydrofuran are added, and the temperature is raised to 100-120° C. under nitrogen protection, and the reaction is carried out for 2-3 hours, and then the temperature is lowered to room temperature, 200-300 parts of acrylic acid and 1-1.2 parts of azobisisobutyronitrile are added, and the temperature is raised to 70-80° C. under nitrogen protection, and the reaction is carried out for 1-2 hours to obtain a polymer, and finally the polymer is placed in petroleum ether and anhydrous ether with a volume ratio of 1:1 for precipitation, and then filtered, washed with water, and dried to obtain a dispersant.

6. The antibacterial and formaldehyde-removing artistic paint according to claim 4, characterized in that: The leveling agent is of fluorocarbon type.

7. The antibacterial and formaldehyde-removing artistic paint according to claim 4, characterized in that: The adhesion promoter is a silane coupling agent.

8. The antibacterial and formaldehyde-removing artistic paint according to claim 4, characterized in that: The photocatalyst is 30-50nm nano titanium dioxide.

9. The antibacterial and formaldehyde-removing artistic paint according to claim 1, characterized in that: The filler is prepared by mixing talcum powder and light calcium carbonate in equal mass ratio.

10. A method for preparing the antibacterial and formaldehyde-removing artistic paint according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: mixing water-based acrylic emulsion, nano silver, formaldehyde removal agent, auxiliary agent, filler and water according to the required weight parts of the formula to obtain the antibacterial formaldehyde removal type artistic paint.

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