Antibacterial and mildewproof latex paint with frosted hand feeling and preparation method of antibacterial and mildewproof latex paint

Abstract

The invention provides antibacterial and mildew-proof latex paint with frosted hand feeling and a preparation method thereof, and relates to the technical field of latex paint. The emulsion paint provided by the invention is prepared from the following components in percentage by mass: 10 to 30 percent of water-based acrylic emulsion, 0.6 to 1.0 percent of surfactant, 0.3 to 0.8 percent of dispersing agent, 0.3 to 0.8 percent of defoaming agent, 0.4 to 1.0 percent of hydroxyethyl cellulose, 0.8 to 2.5 percent of coalescing agent, 8 to 20 percent of pigment, 25 to 40 percent of filler, 0.1 to 0.5 percent of polyurethane flatting agent, 0.2 to 0.4 percent of sterilizing agent, 0.1 to 0.3 percent of mildew preventive, 0.03 to 0.3 percent of pH regulator, 3 to 10 percent of filler with frosted hand feeling and the balance of water. A dry film of the emulsion paint provided by the invention on a wall surface has a frosted texture, and a unique wall surface decoration effect is brought; the coating is antibacterial and mildew-proof, and has excellent physical properties; meanwhile, the environment-friendly grade and the construction odor removal performance are high.

Description

Technical Field

[0001] The present invention relates to the technical field of latex paints, and particularly relates to an antibacterial and mildew-proof latex paint with a matte feel and a preparation method thereof. Background Art

[0002] Water-based latex paints use water as the dispersion medium and contain no or only a small amount of organic solvents. Therefore, during production and construction, there is no or basically no problem of environmental pollution and harm to the human body caused by the volatilization of organic solvents. At the same time, during transportation and storage, there is also no risk of explosion and fire. And it has the advantages of convenient construction, fast drying of the coating film, good water resistance and good air permeability. Therefore, water-based latex paints have been widely used in the field of interior wall painting.

[0003] In recent years, there has been a huge change in the consumption demand trend in the painting market. More and more consumers are gradually inclined to choose products with decorative effects. Coating products with special decorative effects, such as those with a matte effect, have been widely favored by consumers in recent years. Currently, coating products with a matte effect are mainly concentrated in the field of industrial paints, with oil-based two-component as the main film-forming substance, and their environmental protection performance is poor. The coating of water-based latex paints is generally smooth and flat on the surface, unable to highlight personalized and unique effects, and unable to meet the requirements of people's pursuit of fashion and art. Developing an environmentally friendly latex paint with a matte feel is of great significance for meeting the current industry situation and market demand and expanding the application scenarios of products. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an antibacterial and mildew-proof latex paint with a matte feel and a preparation method thereof. The latex paint provided by the present invention has high environmental protection and has many excellent performance advantages such as a matte feel, antibacterial and mildew-proof.

[0005] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0006] The present invention provides an antibacterial and mildew-proof latex paint with a matte feel, comprising the following components in mass percentage:

[0007] 10-30% of water-based acrylic emulsion, 0.6-1.0% of surfactant, 0.3-0.8% of dispersant, 0.3-0.8% of defoamer, 0.4-1.0% of hydroxyethyl cellulose, 0.8-2.5% of film-forming aid, 8-20% of pigment, 25-40% of filler, 0.1-0.5% of polyurethane leveling agent, 0.2-0.4% of bactericide, 0.1-0.3% of mildew-proof agent, 0.03-0.3% of pH regulator, 3-10% of matte feel filler, and the balance is water;

[0008] The film-forming aid includes diisobutyl adipate;

[0009] The particle size of the pigment is 20 to 40 μm, and the particle size of the filler is 0.5 to 25 μm;

[0010] The matte feel filler includes one or more of polypropylene wax powder, calcium carbonate sand, ceramic beads, and large particle size acrylic emulsion, and the particle size of the matte feel filler is 30 to 70 μm.

[0011] Preferably, the surfactant includes a first surfactant and a second surfactant. The first surfactant is an alkyl polyoxyethylene ether surfactant, the second surfactant is an ethoxy compound, and the mass ratio of the first surfactant to the second surfactant is 1:6 to 7.5.

[0012] Preferably, the dispersant includes sodium acrylate homopolymer; the defoamer includes a star polymer mineral oil defoamer.

[0013] Preferably, the pigment includes titanium dioxide.

[0014] Preferably, the filler includes heavy calcium carbonate, calcined kaolin, and mica powder, and the mass ratio of heavy calcium carbonate, calcined kaolin, and mica powder is 1: 0.5 to 2: 0.1 to 0.3.

[0015] Preferably, the particle size of the calcined kaolin is 0.5 to 5 μm, the particle size of the heavy calcium carbonate is 12 to 25 μm, and the particle size of the mica powder is 18 to 25 μm.

[0016] Preferably, the pH regulator is an aqueous sodium hydroxide solution, and the mass fraction of the aqueous sodium hydroxide solution is 10%.

[0017] The present invention provides a method for preparing the antibacterial and mildew-proof latex paint with a matte feel according to the above technical solutions, including the following steps:

[0018] First, stir and mix water, dispersant, surfactant, defoamer, film-forming aid, hydroxyethyl cellulose, and pH regulator to obtain a premix;

[0019] Then, second, stir and mix the premix with the pigment and filler to obtain a pigment and filler mixed dispersion;

[0020] Finally, third, stir and mix the pigment and filler mixed dispersion with the aqueous acrylic emulsion, polyurethane leveling agent, matte feel filler, bactericide, and mildew-proof agent to obtain the antibacterial and mildew-proof latex paint with a matte feel.

[0021] Preferably, the stirring speed of the first stirring and mixing is 300 to 500 rpm, the stirring speed of the second stirring and mixing is 700 to 900 rpm, and the stirring speed of the third stirring and mixing is 500 to 700 rpm.

[0022] Preferably, the fineness of the pigment and filler mixed dispersion is less than 50 μm.

[0023] The present invention provides an antibacterial and mildew-proof latex paint with a matte feel, comprising the following components in mass percentage: 10-30% of an aqueous acrylic emulsion, 0.6-1.0% of a surfactant, 0.3-0.8% of a dispersant, 0.3-0.8% of an antifoaming agent, 0.4-1.0% of hydroxyethyl cellulose, 0.8-2.5% of a film-forming aid, 8-20% of a pigment, 25-40% of a filler, 0.1-0.5% of a polyurethane leveling agent, 0.2-0.4% of a bactericide, 0.1-0.3% of a mildew-proof agent, 0.03-0.3% of a pH regulator, 3-10% of a matte feel filler, and the balance being water; the matte feel filler includes one or more of polypropylene wax powder, calcium carbonate sand, ceramic beads, and large-particle-size acrylic emulsions, and the particle size of the matte feel filler is 30-70 μm. By screening suitable matte feel fillers, the dry film of the paint on the wall has a special matte feel. Moreover, the small-particle-size pigments and fillers are combined with hydroxyethyl cellulose and polyurethane leveling agent with good leveling effects to ensure good basic leveling effects of the coating film, highlighting the special feel brought by the matte feel fillers; the emulsion with good encapsulation performance is combined with a film-forming aid with odorless and high swelling efficiency, enabling such relatively rough coating films to have good scrub resistance performance in line with national standards; the addition of the mildew-proof agent and bactericide brings additional antibacterial and mildew-proof properties to the coating film, solving the problem of wall mildew. Compared with the prior art, the present invention has the following beneficial effects:

[0024] The dry film of the latex paint provided by the present invention on the wall has a special matte texture, thus bringing a unique wall decoration effect to consumers;

[0025] The latex paint provided by the present invention has antibacterial and mildew-proof properties, and the coating film has excellent physical properties, meeting the requirements of the first-class product (the highest grade) of GB / T 9756-2018 "Interior Wall Coatings of Synthetic Resin Emulsion";

[0026] The latex paint provided by the present invention shows excellent performance in terms of environmental protection. The environmental protection performance of the product meets the requirements of GB 18582-2020 "Limit of Hazardous Substances in Interior Wall Coatings for Interior Decoration Materials". Substances such as VOC, formaldehyde, benzene series, heavy metals, and APEO are not detected. The product has passed 4 high-end environmental protection certifications in countries or regions. The environmental protection level and construction odorless performance are outstanding, effectively ensuring the user experience;

[0027] The latex paint provided by the present invention has a wide range of applicability, suitable for various construction processes such as brushing, rolling, and spraying, and suitable for the requirements of various decoration spaces such as old house renovation and new house construction.

[0028] The present invention provides a method for preparing the antibacterial and mildew-proof latex paint with a matte feel as described in the above technical solution, which is simple and easy to implement and convenient for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the film effect of the latex paint (after color matching) in Example 1;

[0030] Figure 2 It is the film effect of the latex paint (after color matching) in Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0031] The present invention provides an antibacterial and mildew-proof latex paint with a matte feel, which comprises the following components in mass percentage:

[0032] 10-30% of waterborne acrylic emulsion, 0.6-1.0% of surfactant, 0.3-0.8% of dispersant, 0.3-0.8% of defoamer, 0.4-1.0% of hydroxyethyl cellulose, 0.8-2.5% of film-forming aid, 8-20% of pigment, 25-40% of filler, 0.1-0.5% of polyurethane leveling agent, 0.2-0.4% of bactericide, 0.1-0.3% of mildew-proof agent, 0.03-0.3% of pH regulator, 3-10% of matte feel filler, and the balance is water;

[0033] The film-forming aid includes diisobutyl adipate;

[0034] The particle size of the pigment is 20-40 μm, and the particle size of the filler is 0.5-25 μm;

[0035] The matte feel filler includes one or more of polypropylene wax powder, calcium carbonate sand, ceramic beads and large-particle-size acrylic emulsion, and the particle size of the matte feel filler is 30-70 μm.

[0036] In the present invention, unless otherwise specified, the raw materials involved are well-known commercially available products in the art.

[0037] Calculated by mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 10-30% of waterborne acrylic emulsion, which can be 10%, 14%, 20%, 25%, 28% or 30%. In the present invention, the waterborne acrylic emulsion is preferably the waterborne acrylic emulsion with the model number ECO 7081 and / or Plus 7679 produced by BASF. The waterborne acrylic emulsion has no synthetic derivatives, residual monomers and other volatile organic compounds. The emulsion raw materials have almost no smell and excellent encapsulation performance, which can make the coating film have good scrub resistance.

[0038] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 0.6 to 1.0% of a surfactant, which can be 0.6%, 0.7%, 0.85%, 0.9%, or 1.0%. In the present invention, the surfactant preferably includes a first surfactant and a second surfactant; the first surfactant is preferably an alkyl polyoxyethylene ether surfactant, and the alkyl polyoxyethylene ether surfactant is preferably the alkyl polyoxyethylene ether surfactant with the model number LCN-407 produced by Clariant; the second surfactant is preferably an ethoxy compound, and the ethoxy compound is preferably the ethoxy compound of Nouryon EF-90; the mass ratio of the first surfactant to the second surfactant is preferably 1:6 to 7.5. In the present invention, by combining the ethoxy compound with the alkyl polyoxyethylene ether surfactant, it is possible to ensure the wetting and color adjustment properties of the product while assisting the emulsion to remain stable in the freeze-thaw cycle test of the coating system.

[0039] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 0.3 to 0.8% of a dispersant, which can be 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, or 0.8%. In the present invention, the dispersant preferably includes sodium acrylate homopolymer, and the sodium acrylate homopolymer is preferably the sodium acrylate homopolymer with the model number P30 produced by Arkema.

[0040] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 0.3 to 0.8% of an antifoaming agent, which can be 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, or 0.8%. In the present invention, the antifoaming agent preferably includes a star polymer mineral oil antifoaming agent, and the star polymer mineral oil antifoaming agent is preferably the star polymer mineral oil antifoaming agent with the model number DSR-5510 of Shanghai Deshangrui Technology Trading Co., Ltd.

[0041] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 0.4 to 1.0% of hydroxyethyl cellulose, which can be 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, or 1.0%. In the present invention, the hydroxyethyl cellulose is preferably purchased from Ashland, with the model number 250HBR. In the present invention, the hydroxyethyl cellulose plays a role in thickening and water retention, which is beneficial to improving the storage stability of the latex paint system, improving the workability, and improving the flatness of the coating film.

[0042] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 0.8-2.5% of a film-forming aid, which can be 0.8%, 1%, 1.5%, 1.8%, 2%, 2.5%. In the present invention, the film-forming aid includes diisobutyl adipate, and the diisobutyl adipate is preferably purchased from Shengxinghang Company, with the model number DA; the film-forming aid has the characteristics of low odor and high film-forming efficiency. Compared with other film-forming aids, at the same solid content percentage addition, it can effectively reduce the MFT (i.e., the minimum film-forming temperature) of the emulsion; at the same time, the hydrolysis monomer odor of the ester monomer during the drying process is also very low.

[0043] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 8-20% of pigments, which can be 8%, 8.5%, 10%, 15%, 20%. In the present invention, the particle size of the pigments is preferably 20-40 μm; the pigments preferably include titanium dioxide, and the titanium dioxide is preferably the titanium dioxide of model SR-237 produced by Dongjia Company.

[0044] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 25-40% of fillers, which can be 25%, 30%, 36%, 40%. In the present invention, the particle size of the fillers is 0.5-25 μm. In the present invention, the fillers preferably include heavy calcium (i.e., heavy calcium carbonate), calcined kaolin, and mica powder. The particle size of the calcined kaolin is preferably 0.5-5 μm, the particle size of the heavy calcium is preferably 12-25 μm, and the particle size of the mica powder is preferably 18-25 μm; the mass ratio of the heavy calcium, calcined kaolin, and mica powder is preferably 1:0.5-2:0.1-0.3. In the examples of the present invention, the heavy calcium is preferably the heavy calcium of model JF-1250 produced by Jiaoling Jinpeng Company, the calcined kaolin is preferably the calcined kaolin of model 80L produced by Madison Company, and the mica powder is preferably the mica powder of model GB-4 produced by Greentec Company. The present invention uses heavy calcium, calcined kaolin, and mica powder as a filler combination. The filler combination with a fine particle size can ensure good dry film hiding power of the paint, and at the same time will not interfere with the display of the effect of the matte feel filler. Among them, the mica powder also has good anti-cracking performance.

[0045] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 0.1-0.5% of a polyurethane leveling agent, which can be 0.1%, 0.2%, 0.3%, 0.4%, 0.5%. In the present invention, the polyurethane leveling agent is the leveling agent of model U300E produced by Wanhua Company.

[0046] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 0.2-0.4% of a fungicide, which can be 0.2%, 0.25%, 0.3%, or 0.4%. In the present invention, the fungicide is preferably the 130S fungicide and / or the DMB fungicide produced by Ossada Company. When the fungicide is the 130S fungicide and the DMB fungicide produced by Ossada Company, the mass ratio of the 130S fungicide to the DMB fungicide is preferably 1:1.5.

[0047] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 0.1-0.3% of a mildew-proof agent, which can be 0.1%, 0.2%, or 0.3%. In the present invention, the mildew-proof agent is preferably an IPBC-type mildew-proof agent, and more preferably the PW-40 mildew-proof agent produced by Troy Company; the mildew-proof agent can effectively inhibit the growth of common types of molds, bringing a long-lasting mildew-proof and antibacterial effect to the coating film.

[0048] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 0.03-0.3% of a pH regulator, which can be 0.03%, 0.05%, 0.1%, 0.2%, or 0.3%. In the present invention, the pH regulator is preferably an aqueous sodium hydroxide solution, and the mass fraction of the aqueous sodium hydroxide solution is preferably 10%.

[0049] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes 3-10% of a matte feel filler, which can be 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%. In the present invention, the matte feel filler includes one or more of polypropylene wax powder, calcium carbonate sand, ceramic beads, and large-particle-size acrylic emulsion. The matte feel filler is a material with a spherical or quasi-spherical structure, and the particle size of the matte feel filler is 30-70 μm, preferably 30-50 μm. In the present invention, the matte feel filler is preferably the spherical sand flour (polypropylene wax powder) of model SFY-35 produced by Foshan Jinyaocai Decoration Materials Co., Ltd. and / or the spherical sand of brand 600Y produced by Hezhou Yongtong New Environmental Protection Coating Co., Ltd. By adding a specific feel filler, the present invention can bring a matte feel to the paint film. By limiting the particle size of the matte feel filler, a matte feel with good feel performance can be obtained. By controlling the addition amount of the matte feel filler, different degrees of matte effects can be obtained, each with its own characteristics.

[0050] In terms of mass percentage, the antibacterial and mildew-proof latex paint with a matte feel provided by the present invention includes the balance of water. The present invention has no special requirements for the water.

[0051] In the present invention, the aqueous acrylic emulsion and other components are all products that have undergone chemical treatment and steam extraction treatment. The present invention strictly controls the content of harmful substances such as residual monomers, solvents, formaldehyde, heavy metals, and APEO in raw materials, ensuring that the products can meet the requirements of top environmental protection certifications from the raw materials, and making the products free of substances harmful to the human body, carcinogenic, or causing reproductive toxicity. For example: surfactants, pH regulators, and dispersants with low odor, free of harmful substances such as VOC, formaldehyde, benzene series, and NPEO are selected; fungicides and mildew inhibitors containing formaldehyde and controlled heavy metals are not used; the odor and harmful substances brought in by auxiliaries are strictly controlled to ensure excellent performance in environmental protection performance testing and user experience. In terms of odor, the odor-free technology platform of Carpoly is adopted. Through a dedicated odor olfactory discrimination team, raw materials are screened and the overall formulation is developed and adjusted based on comprehensive environmental protection indicators. The final product has the top odor-free level in the industry. At the same time, in the selection of raw materials, enterprises with relevant certifications such as carbon footprint certification, bio-based, and sustainable development are given priority, and their raw materials are included in the supply chain scope.

[0052] The latex paint provided by the present invention has many excellent performance advantages such as a matte handfeel, antibacterial and mildew-proof, and odor-free. Its environmental protection performance meets the requirements of GB 18582-2020 "Limit of Hazardous Substances in Interior Wall Coatings for Interior Decoration Materials"; in terms of well-known international top environmental protection certifications, it meets the requirements of the American GREENGUARD GOLD Certifation at the gold level, meets the FDA test index requirements of the US Food and Drug Administration, meets the requirements of the French A+ level certification, and meets the requirements of the EU REACH regulation; during the entire process of paint construction, including during construction, after construction, and in the long-term process after the wall is completely dry, there will be no intense or irritating odor and harmful substances volatilize, effectively ensuring the user experience. Moreover, the latex paint film provided by the present invention has excellent physical properties and wide applicability, suitable for various construction processes such as brushing, rolling, and spraying, and suitable for the requirements of various decoration spaces such as old house renovation and new house construction. The present invention can drive the common development of domestic peer industries, upstream supporting enterprises, and downstream application enterprises, is conducive to optimizing the industrial structure and enhancing competitiveness, changing the economic growth mode, and realizing the industrial upgrading of enterprises; it is close to the concepts of environmental protection and green, and strictly controls carbon emissions.

[0053] The present invention provides a preparation method of the antibacterial and mildew-proof latex paint with a matte handfeel as described in the above technical solutions, including the following steps:

[0054] Mix water, dispersant, surfactant, defoamer, film-forming aid, hydroxyethyl cellulose, and pH regulator for the first time to obtain a premix;

[0055] Mix the premix with pigments and fillers for the second time to obtain a pigment and filler mixed dispersion;

[0056] The pigment and filler mixture is subjected to a third stirring and mixing with an aqueous acrylic emulsion, a polyurethane leveling agent, a matte feel filler, a bactericide and a mildew preventive to obtain the antibacterial and mildew preventive latex paint with a matte feel.

[0057] In the present invention, water, a dispersant, a surfactant, an antifoaming agent, a film-forming aid, hydroxyethyl cellulose and a pH regulator are subjected to a first stirring and mixing to obtain a premix. In the present invention, the stirring speed of the first stirring and mixing is preferably 300 - 500 rpm.

[0058] In the present invention, the specific operation of the first stirring and mixing is preferably: the dispersant, the surfactant, the antifoaming agent and the film-forming aid are sequentially added to the water, then the dispersing machine is started and stirred at a speed of 300 - 500 rpm (low speed), then hydroxyethyl cellulose is slowly added thereto and stirred for 2 - 3 min until the hydroxyethyl cellulose is basically dissolved, and then the pH regulator is added and stirred for 5 min to obtain the premix. In the present invention, when the surfactant includes the first surfactant and the second surfactant, preferably only the first surfactant is added during the first stirring and mixing.

[0059] After obtaining the premix, the present invention subjects the premix and pigments and fillers to a second stirring and mixing to obtain a pigment and filler mixture. In the present invention, the stirring speed of the second stirring and mixing is preferably 700 - 900 rpm.

[0060] In the present invention, the specific operation of the second stirring and mixing is preferably: after adding the pigments and fillers to the premix, it is dispersed at a speed of 700 - 900 rpm (high speed) for 15 - 20 min to obtain the pigment and filler mixture. In the present invention, the pigments and fillers are added in the order from light to heavy and from large oil absorption amount to small oil absorption amount. In the present invention, the fineness of the pigment and filler mixture is preferably less than 50 μm, and the fineness is preferably detected by the blade fineness method; when the fineness does not meet the requirements, the dispersion time needs to be continuously extended until the fineness reaches the standard.

[0061] After obtaining the pigment and filler mixture, the present invention subjects the pigment and filler mixture to a third stirring and mixing with an aqueous acrylic emulsion, a polyurethane leveling agent, a matte feel filler, a bactericide and a mildew preventive to obtain the antibacterial and mildew preventive latex paint with a matte feel. In the present invention, the stirring speed of the third stirring and mixing is preferably 500 - 700 rpm.

[0062] In the present invention, the specific operation of the third stirring and mixing is preferably as follows: slowly add an aqueous acrylic emulsion, a polyurethane leveling agent, and a matte touch filler to the pigment and filler mixed dispersion, and mix at a speed of 500 - 700 rpm (medium speed) for 10 - 15 minutes; then sequentially add a bactericide and a mildew preventive to the obtained paint, and mix at a speed of 500 - 700 rpm for 8 - 10 minutes. In the present invention, when the surfactant includes the first surfactant and the second surfactant, the second surfactant is preferably added during the process of slowly adding the aqueous acrylic emulsion, the polyurethane leveling agent, and the matte touch filler to the pigment and filler mixed dispersion.

[0063] In the present invention, after the third stirring and mixing, it is preferred to send the obtained latex paint for performance testing. After passing the test, it is filtered and packaged to obtain the finished latex paint; the performance testing includes the state in the container, workability, drying time, contrast ratio, viscosity, etc.

[0064] During the actual use process, according to the actual painting color requirements, colorants can also be added to the latex paint. The present invention has no special requirements on the type and dosage of the colorants, and they can be added according to the specific requirements for the color.

[0065] To further illustrate the present invention, the following examples are used to describe in detail the antibacterial and mildew - proof latex paint with a matte touch and its preparation method provided by the present invention, but they should not be construed as limiting the protection scope of the present invention.

[0066] Example 1

[0067] An antibacterial and mildew - proof latex paint with a matte touch, the components and their contents are shown in Table 1.

[0068] Table 1 Composition of the formula of the antibacterial and mildew - proof latex paint with a matte touch

[0069]

[0070]

[0071] In Table 1, the aqueous acrylic emulsion is the aqueous acrylic emulsion of model ECO 7081 produced by BASF; the first surfactant is an alkyl polyoxyethylene ether surfactant of model LCN - 407 produced by Clariant, and the second surfactant is an ethoxylated compound of Norion EF - 90; the dispersant is a sodium salt of acrylic acid homopolymer of model P30 produced by Arkema; the defoamer is a star - shaped polymer mineral oil defoamer of model DSR - 5510 produced by Shanghai Deshangrui Technology Trading Co., Ltd.; the film - forming aid is of model produced by Shengxinghang Co., Ltd. EF - 90 of Norion; the dispersant is a sodium salt of acrylic acid homopolymer of model P30 produced by Arkema; the defoamer is a star - shaped polymer mineral oil defoamer of model DSR - 5510 produced by Shanghai Deshangrui Technology Trading Co., Ltd.; the film - forming aid is of model The film-forming aid is diisobutyl adipate of DA; the hydroxyethyl cellulose is 250HBR produced by Ashland; the pigment is SR-237 titanium dioxide (particle size 20-40 μm) produced by Dongjia; the first filler is JF-1250 heavy calcium (particle size 12-25 μm) produced by Jiaoling Jinpeng, the second filler is 80L calcined kaolin (particle size 0.5-5 μm) produced by Madison, and the third filler is GB-4 mica powder (particle size 18-25 μm) produced by Greer; the polyurethane leveling agent is U300E produced by Wanhua; the first fungicide is 130S fungicide produced by Aosada, and the second fungicide is DMB fungicide produced by Aosada; the mildew preventive is mildew preventive of model PW-40 produced by Troy; the pH regulator is 10wt% aqueous sodium hydroxide solution; the matte feel filler is 35μm spherical sand flour of model SFY-35 produced by Foshan Jinyaocai Decoration Materials Co., Ltd.

[0072] The preparation method of the antibacterial and mildew-proof latex paint with a matte feel is as follows:

[0073] (1) Premixing: Add the dispersant, the first surfactant, the defoamer, and the film-forming aid to the water in sequence, then start the disperser to stir at a low speed (400 rpm), and then slowly add the hydroxyethyl cellulose and disperse for 2.5 min until the cellulose is basically dissolved. After adding the pH regulator, mix and stir for 5 min to obtain a premixed material;

[0074] (2) Pigment and filler dispersion: Add the pigment and various fillers to the premixed material in the order from light to heavy and from large oil absorption amount to small oil absorption amount, then disperse at a high speed (800 rpm) for 18 min, send the slurry for scraping fineness detection, and the fineness requirement is <50 μm. If the fineness is unqualified, continue to extend the dispersion time until the fineness of the slurry reaches the standard and then continue production;

[0075] (3) Paint adjustment: Slowly add the waterborne acrylic emulsion, the polyurethane leveling agent, the second surfactant, and the matte feel filler to the pigment and filler mixed dispersion obtained in step (2), and mix at a medium speed (600 rpm) for 13 min;

[0076] (4) Final mixing: Finally, add the first fungicide, the second fungicide, and the mildew preventive to the paint obtained in step (3) and mix at a medium speed (600 rpm) for 9 min;

[0077] (5) Finished product inspection and packaging: Detect various performance indicators of the product obtained in step (4), including the state in the container, workability, drying time, contrast ratio, viscosity, etc. After passing the inspection, it can be filtered and packaged to obtain the finished latex paint.

[0078] Example 2

[0079] An antibacterial and mildew-proof latex paint with a matte feel, the components and their contents are shown in Table 2.

[0080] Table 2 Composition of the antibacterial and mildew-proof latex paint with a matte feel

[0081] Component Content (wt%) Waterborne acrylic emulsion 28％ First surfactant 0.1％ Second surfactant 0.6％ Dispersant 0.5％ Defoamer 0.7％ Film-forming aid 1.8％ Hydroxyethyl cellulose 0.4％ Pigment 20％ First filler 15％ Second filler 8％ Third filler 2％ Polyurethane leveling agent 0.2％ First bactericide 0.1％ Second bactericide 0.15％ Mildew preventive 0.2％ pH regulator 0.03％ Water 17.22％ Matte feel filler 5％

[0082] In Table 2, the aqueous acrylic emulsion is the aqueous acrylic emulsion of model Plus 7679 produced by BASF; the first surfactant is an alkyl polyoxyethylene ether surfactant of model LCN-407 produced by Clariant, and the second surfactant is an ethoxylated compound of EF-90 of Nouryon; the dispersant is a sodium salt of acrylic acid homopolymer of model P30 produced by Arkema; the defoamer is a star polymer mineral oil defoamer of model DSR-5510 of Shanghai Deshangrui Technology Trading Co., Ltd.; the film-forming aid is a film-forming aid of diisobutyl adipate of model DA produced by Shengxinghang Co., Ltd.; hydroxyethyl cellulose is 250HBR produced by Ashland; the pigment is SR-237 titanium dioxide (particle size 20 - 40μm) produced by Dongjia Co., Ltd.; the first filler is JF-1250 heavy calcium (particle size 12 - 25μm) produced by Jiaoling Jinpeng Co., Ltd., the second filler is 80L calcined kaolin (particle size 0.5 - 5μm) produced by Madison Co., Ltd., and the third filler is GB-4 mica powder (particle size 18 - 25μm) produced by Greer Co., Ltd.; the polyurethane leveling agent is U300E produced by Wanhua Co., Ltd.; the first bactericide is bactericide 130S produced by Ossada Co., Ltd., and the second bactericide is bactericide DMB produced by Ossada Co., Ltd.; the mildew-proof agent is a mildew-proof agent of model PW-40 produced by Troy Co., Ltd.; the pH regulator is a 10wt% aqueous sodium hydroxide solution; the matte feel filler is 30 - 50μm spherical sand of brand 600Y produced by Hezhou Yongtong New Environmental Protection Coating Co., Ltd.

[0083] The preparation method of the antibacterial and mildew-proof latex paint with a matte feel is the same as that of Example 1.

[0084] Comparative Example 1

[0085] Other raw materials are the same as those in Example 1, the difference is only that: 100μm spherical sand of brand 150Y produced by Hezhou Yongtong New Environmental Protection Coating Co., Ltd. is used to replace the 35μm spherical sand flour of model SFY-35 produced by Foshan Jinyaocai Decoration Materials Co., Ltd.; the preparation method of the latex paint is the same as that of Example 1.

[0086] Comparative Example 2

[0087] The other raw materials are the same as those in Example 2, except that: an ordinary styrene-acrylic emulsion with the brand name RS-5313 produced by Badfu Coating Co., Ltd. is used instead of the aqueous acrylic emulsion Plus 7679 produced by BASF, and 2.2% of the film-forming aid TEXANOL produced by EASTMAN Co., Ltd. is used instead of 1.8% of the diisobutyl adipate film-forming aid with the model number DA produced by Shengxinghang Co., Ltd. The excess part is deducted by 0.4% of water. The first filler uses 350-mesh heavy calcium with the brand name 903 produced by Jiangxi Guangyuan Chemical Co., Ltd. instead of the JF-1250 heavy calcium produced by Jiaoling Jinpeng Co., Ltd., and no mildew-proof agent is added.

[0088] The preparation method of the latex paint is the same as that in Example 1.

[0089] Performance tests were carried out on the antibacterial and mildew-proof latex paints with a matte feel prepared in the examples and comparative examples, as follows:

[0090] (I) Construction performance and film performance

[0091] Table 3 shows the construction performance and film performance data of the latex paints prepared in the examples and comparative examples.

[0092] Table 3 Construction performance and film performance of the latex paints prepared in the examples and comparative examples

[0093]

[0094]

[0095] In Table 3, the odor is scored on a 10-point scale. The higher the score, the better the performance. 8-10 points means zero odor, 6-8 points means near-zero odor, 4-6 points means low odor, 2-4 points means obvious odor, and 0-2 points means intolerable odor. Refer to the test method for the odor intensity part of the odor release of building materials products in GB / T43353-2023. In Table 3, the overall effect includes the judgment of the film gloss uniformity, powder falling, sagging, pinholes, defoaming, oil shrinkage and other film defects. If there are no above problems, it can be judged as excellent. The uniformity in Table 3 is mainly the uniformity presented by the film roller coating construction effect. If there are no roller marks and particle accumulation on the film, it can be judged as excellent.

[0096] Colorant (the professional color paste for net smell and colorful colors KCA-R (red) produced by Color Corporation of America) was added to the latex paints prepared in Examples 1-2 for color matching, and the addition amount of the colorant was 2% of the mass of the latex paint. Figure 1 The film effect obtained by spraying after color matching the latex paint in Example 1 (the film thickness is 85μm), Figure 2It is the film effect obtained by spraying the latex paint after color matching in Example 2 (the film thickness is 160 μm).

[0097] (II) Physical properties of the coating

[0098] The performance of the latex paints prepared in the examples and comparative examples was tested according to GB / T 9756-2018 "Interior wall coatings of synthetic resin emulsions", and the test data are shown in Table 4.

[0099] Table 4 Physical properties of the latex paints prepared in the examples and comparative examples

[0100]

[0101] (III) Environmental protection performance

[0102] The environmental protection performance of the latex paints prepared in the examples and comparative examples was tested according to the requirements of GB18582-2020 "Limit of harmful substances in architectural wall coatings", and the test data are shown in Table 5.

[0103] Table 5 Environmental protection performance of the latex paints prepared in the examples and comparative examples

[0104]

[0105]

[0106] (IV) Antibacterial and mildew-proof performance

[0107] The antibacterial and mildew-proof performance of the latex paints prepared in the examples and comparative examples was tested according to the requirements of HG / T 3950-2007 "Antibacterial and mildew-proof latex paints", and the test data are shown in Table 6.

[0108] Table 6 Antibacterial and mildew-proof performance of the latex paints prepared in the examples and comparative examples

[0109]

[0110] It can be seen from the above examples that the latex paint provided by the present invention has many excellent properties such as a matte feel, odorless and environmentally friendly, antibacterial and mildew-proof, and has a broad application scenario, thus being able to expand the market of interior latex paints.

[0111] The above is only the preferred embodiment of the present invention, and it is not intended to limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An antibacterial and anti-mildew latex paint with a frosted feel, characterized in that: Includes the following components in percentage by mass: Water-based acrylic emulsion 10-30%, surfactant 0.6-1.0%, dispersant 0.3-0.8%, defoamer 0.3-0.8%, hydroxyethyl cellulose 0.4-1.0%, film-forming aid 0.8-2.5%, pigment 8-20%, filler 25-40%, polyurethane leveling agent 0.1-0.5%, bactericide 0.2-0.4%, mildewproof agent 0.1-0.3%, pH adjuster 0.03-0.3%, frosted feel filler 3-10%, water balance; The film-forming aid includes diisobutyl adipate; The particle size of the pigment is 20 to 40 μm, and the particle size of the filler is 0.5 to 25 μm; The frosted feel filler comprises one or more of polypropylene wax powder, calcium carbonate sand, ceramic beads and large-particle acrylic emulsion, and the particle size of the frosted feel filler is 30-70 μm.

2. The antibacterial and mildew-proof latex paint with a frosted feel according to claim 1, characterized in that: The surfactant comprises a first surfactant and a second surfactant, the first surfactant is an alkyl polyoxyethylene ether surfactant, the second surfactant is an ethoxylate, and the mass ratio of the first surfactant to the second surfactant is 1:6-7.

5.

3. The antibacterial and mildew-proof latex paint with a frosted feel according to claim 1, characterized in that: The dispersant includes sodium salt of acrylic acid homopolymer; and the defoamer includes a star polymer mineral oil defoamer.

4. The antibacterial and mildew-proof latex paint with a frosted feel according to claim 1, characterized in that: The pigment includes titanium dioxide.

5. The antibacterial and mildew-proof latex paint with a frosted feel according to claim 1, characterized in that: The filler comprises heavy calcium, calcined kaolin and mica powder, and the mass ratio of the heavy calcium, calcined kaolin and mica powder is 1:0.5-2:0.1-0.

3.

6. The antibacterial and anti-mildew latex paint with a frosted feel according to claim 5, characterized in that: The particle size of the calcined kaolin is 0.5 to 5 μm, the particle size of the heavy calcium is 12 to 25 μm, and the particle size of the mica powder is 18 to 25 μm.

7. The antibacterial and anti-mildew latex paint with a frosted feel according to claim 1, characterized in that: The pH regulator is a sodium hydroxide aqueous solution, and the mass fraction of the sodium hydroxide aqueous solution is 10%.

8. The method for preparing the antibacterial and mildew-proof latex paint with a frosted feel according to any one of claims 1 to 7, characterized in that: The following steps are involved: The water, dispersant, surfactant, defoamer, film-forming aid, hydroxyethyl cellulose and pH regulator are first stirred and mixed to obtain a premix; The premix is ​​mixed with the pigment and the filler for a second time to obtain a pigment-filler mixed dispersion; The pigment and filler mixed dispersion is mixed with water-based acrylic emulsion, polyurethane leveling agent, frosted feel filler, bactericide and mildewproof agent for a third time to obtain the antibacterial and mildewproof latex paint with frosted feel.

9. The preparation method according to claim 8, characterized in that: The stirring speed of the first stirring and mixing is 300-500 rpm, the stirring speed of the second stirring and mixing is 700-900 rpm, and the stirring speed of the third stirring and mixing is 500-700 rpm.

10. The preparation method according to claim 8 or 9, characterized in that: The fineness of the pigment and filler mixed dispersion is less than 50 μm.

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