Emulsion paint as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of latex paint, and particularly relates to latex paint as well as a preparation method and application thereof. The latex paint is prepared from styrene-acrylic emulsion, wax emulsion, sepiolite and auxiliaries. The mass ratio of the styrene / acrylate copolymer in the styrene-acrylic emulsion is 47-49%; the wax emulsion comprises a paraffin-modified nonionic oil-in-water emulsion; the auxiliary agent comprises a film-forming auxiliary agent; the coalescing agent comprises at least one of a diisobutyl ester compound and a carboxylic ester compound. According to the present invention, the paraffin-modified non-ionized oil-in-water emulsion is adopted as the wax emulsion, the specific type of the film forming auxiliary agent is adopted, and the styrene-acrylic emulsion, the sepiolite and other components are combined to act together, such that the latex paint has characteristics of good washing resistance, good scraping resistance, good low-temperature film forming property, good thick film cracking resistance, good storage stability, good gloss, good water resistance, good water resistance, good water resistance, good water resistance, and the like. The formaldehyde purification effect is good, no other harmful substances are released, and the environment-friendly effect is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of latex paints, and particularly relates to a latex paint and its preparation method and application. Background Art

[0002] With the improvement of people's awareness of environmental protection and health, the harm of solvent-based polymer materials to the environment and health has been gradually recognized, and water-based polymer materials have begun to occupy more markets. Different from solvent-based polymer materials, the primary problem to be solved in water-based polymer materials is the anti-corrosion problem, because bacteria are particularly likely to breed in water-based systems, causing damage to polymer materials. Since the 1960s, formaldehyde-containing preservatives have been widely used to protect water-based polymer materials. Currently, the usage rate of formaldehyde-containing preservatives still exceeds 75%. Formaldehyde has the characteristics of broad-spectrum bactericidal action, quick effect, obvious effect, and gas-phase sterilization. Traditional other preservatives cannot compare with it, and formaldehyde is a suspected carcinogen. The development of green anti-corrosion technology without added formaldehyde will surely become a major market demand.

[0003] Currently, there are various anti-formaldehyde latex paint products on the market, but the existing latex paints need to be further improved in terms of washability, low-temperature film-forming property, and storage stability. They are prone to cracking when thickly coated, and there are also problems with the release of harmful substances.

[0004] Therefore, it is of great significance to provide a latex paint with good washability, low-temperature film-forming property, not easily cracked in thick films, and green and environmentally friendly. Summary of the Invention

[0005] The present invention aims to solve one or more of the above-mentioned technical problems existing in the prior art and at least provide a beneficial option. Specifically, the present invention provides a latex paint, which has good washability, low-temperature film-forming property, not easily cracked in thick films, and is green and environmentally friendly.

[0006] The inventive concept of the present invention: The latex paint of the present invention includes styrene-acrylic emulsion, wax emulsion, sepiolite, and additives; the mass ratio of styrene / acrylic ester copolymer in the styrene-acrylic emulsion is 47-49%; the wax emulsion includes a paraffin-modified non-ionic oil-in-water emulsion; the additives include film-forming aids; the film-forming aids include at least one of diisobutyl ester compounds and carboxylic ester compounds. The present invention uses a paraffin-modified non-ionic oil-in-water emulsion as the wax emulsion, adopts specific types of film-forming aids, and combines styrene-acrylic emulsion and sepiolite. Their combined action makes the latex paint have good washability, low-temperature film-forming property, not easily cracked in thick films, good purification performance for formaldehyde, no release of other harmful components, and is more green and environmentally friendly.

[0007] Therefore, in the first aspect of the present invention, a latex paint is provided.

[0008] Specifically, the latex paint includes styrene acrylic emulsion, wax emulsion, sepiolite, and additives;

[0009] The mass percentage of styrene / acrylate copolymer in the styrene-acrylic emulsion is 47-49%;

[0010] The wax emulsion includes a paraffin-modified nonionic oil-in-water emulsion;

[0011] The auxiliary agent includes a film-forming auxiliary agent; the film-forming auxiliary agent includes at least one of a diisobutyl ester compound and a carboxylic acid ester compound.

[0012] Preferably, the wax emulsion comprises paraffin and fatty alcohol polyoxyethylene ether.

[0013] Preferably, the wax emulsion includes SECOLA WE2039 from Shanghai Secola New Material Technology Co., Ltd. The wax emulsion of the present invention has a hydrophobic effect in water-based coatings, can improve adhesion, and can improve the interfacial tension between latex particles, fill in gaps and enhance, achieve anti-scratch and wear-resistant functions, and enable the coating to obtain excellent scrub resistance; in addition, it can also make the paint film surface smooth, scratch-resistant, friction-resistant, and provide a soft touch, and can be used for architectural coatings, wood and furniture coatings, inks and varnishes, etc.

[0014] Preferably, the sepiolite includes PANGEL AD produced by Shanghai Haiyi Technology and Trade Co., Ltd. Sepiolite can improve the stability and spreading performance of the system. In a static state, it gives the system a high consistency, produces a suspension effect and greatly resists sedimentation and avoids precipitation. Under the action of shear stress, the viscosity can be rapidly reduced, which is convenient for manual and mechanical spreading and leveling. The fluidity and consistency of the system can be controlled to ensure the optimal distribution of solvents, fillers and other ingredients. The suspension made of sepiolite is very stable even at high electrolyte concentrations, and its rheological properties remain stable over a wide pH range and at high temperatures, maintaining high absorption capacity and a high degree of interaction with polymers. In addition, the fibrous layer chain structure of sepiolite gives it excellent adsorption and dispersibility, can stabilize suspended pigment particles, reduce sedimentation and stratification, and prolong the storage stability of the coating. Its microscopic pore structure can also adsorb harmful gases (such as formaldehyde) to enhance the environmental protection function of the coating.

[0015] Preferably, the styrene-acrylic emulsion includes Badfu synthetic latex NPT-9909. The styrene-acrylic emulsion of the present invention is a polymer copolymerized from styrene and acrylate, having excellent interlayer adhesion, water resistance and alkali resistance, and at the same time having excellent chemical stability and calcium ion stability. Adopting a new odorless stripping process, while not damaging the performance of the emulsion, comprehensively improving the environmental performance of the emulsion, without harmful substances such as alkylphenol polyoxyethylene ether compounds (APEO), and not artificially adding formaldehyde, belonging to a highly environmentally friendly product. When formulating low volatile organic compound (VOC) latex paint, it can meet the requirements of the new generation of interior wall environmental protection indicators, and at the same time, as a odorless primer product, it meets the requirements of GB / T9756-2014.

[0016] Preferably, by mass parts, the latex paint includes 28-45 parts of styrene-acrylic emulsion, 4.5-9 parts of wax emulsion, 0.18-0.45 parts of sepiolite, and 0.9-2.2 parts of film-forming aid.

[0017] More preferably, by mass parts, the latex paint includes 31-40 parts of styrene-acrylic emulsion, 5-8 parts of wax emulsion, 0.2-0.4 parts of sepiolite, and 1-2 parts of film-forming aid.

[0018] Preferably, the latex paint further includes pigment extender and water.

[0019] Preferably, the additives further include at least one of bamboo charcoal powder, dispersant, antifreeze, defoamer, multifunctional additive, thickener, preservative, mildew preventive, and antibacterial agent.

[0020] Preferably, the pigments include at least one of calcium carbonate, barium sulfate, and titanium dioxide.

[0021] Preferably, the additives further include bamboo charcoal powder, dispersant, antifreeze, defoamer, multifunctional additive, thickener, preservative, mildew preventive, and antibacterial agent; the pigments include calcium carbonate, barium sulfate, and titanium dioxide; and by mass parts, the latex paint includes 28-45 parts of styrene-acrylic emulsion, 4.5-9 parts of wax emulsion, 0.18-0.45 parts of sepiolite, 0.01-0.02 parts of bamboo charcoal powder, 0.45-1.1 parts of dispersant, 0.18-0.65 parts of antifreeze, 0.9-2.2 parts of defoamer, 0.13-0.38 parts of multifunctional additive, 3.5-6.5 parts of thickener, 0.9-2.2 parts of film-forming aid, 0.13-0.55 parts of preservative, 0.35-0.9 parts of mildew preventive, 0.02-0.04 parts of antibacterial agent, 13-33 parts of calcium carbonate, 1.8-7.5 parts of barium sulfate, 1-5 parts of titanium dioxide, and 12-28 parts of water.

[0022] Further preferably, by mass parts, the latex paint comprises 31 - 40 parts of styrene-acrylic emulsion, 5 - 8 parts of wax emulsion, 0.2 - 0.4 parts of sepiolite, 0.01 - 0.02 parts of bamboo charcoal powder, 0.5 - 1 part of dispersant, 0.2 - 0.6 part of antifreeze, 1 - 2 parts of defoamer, 0.15 - 0.35 part of multifunctional additive, 4 - 6 parts of thickener, 1 - 2 parts of film-forming aid, 0.15 - 0.5 part of preservative, 0.4 - 0.8 part of mildew-proof agent, 0.02 - 0.04 part of antibacterial agent, 15 - 30 parts of calcium carbonate, 2 - 7 parts of barium sulfate, 2 - 4 parts of titanium dioxide and 13 - 25 parts of water.

[0023] Specifically, the bamboo charcoal powder of the present invention is porous and has good adsorption capacity, which is easier to capture free bacteria, increases the contact area between the paint film and bacteria, improves the anti-corrosion efficiency and effect, and enhances the purification effect of the product.

[0024] Preferably, the dispersant comprises ECODIS TM P 30. The dispersant of the present invention can ensure the complete dispersion of pigments and fillers in a high-solids system of high polyvinyl chloride (PVC).

[0025] Preferably, the antifreeze comprises alcohol-based antifreeze; further preferably, the antifreeze comprises at least one of ethylene glycol and propylene glycol.

[0026] Specifically, the antifreeze is an alcohol-based liquid that is miscible with water. By mixing with water in a certain proportion, it changes the vapor pressure of the cooling water, greatly reduces the freezing point, and thus improves the antifreeze ability of the paint.

[0027] Preferably, the defoamer comprises polymer composite mineral oil-based defoamer; further preferably, the defoamer comprises at least one of BASF 2410AG and 2410AC. The defoamer of the present invention has the ability to quickly break large bubbles and microbubbles, and at the same time has a wetting effect.

[0028] Preferably, the multifunctional additive comprises amine-based additive; further preferably, the multifunctional additive comprises at least one of Cheng Chemical VANTEX-T and Dow AMP-95.

[0029] Specifically, the multifunctional additive is an aqueous additive applied in an aqueous system. After high-shear dispersion, it can efficiently thicken the system and improve the film-forming property and brushing property.

[0030] Preferably, the thickener comprises hydrophobically modified associative thickener; further preferably, the thickener comprises at least one of Dow RM8W and Dow RM-2100; more preferably, the thickener comprises Dow RM8W and Dow RM-2100.

[0031] The thickener of the present invention introduces hydrophobic groups onto the molecules of ordinary non - associative anionic polymers (ASE polymers), enabling association to occur between the same molecule / different molecules to form micelle structures, achieving good thickening efficiency, and improving the sagging and splashing properties as well as the layering condition of the coating. Meanwhile, by combining with a non - ionic associative polyurethane thickener, the washability and leveling property of the coating are improved.

[0032] Preferably, the film - forming aid includes at least one of Dow COASOL and Dow COASOL 290. The components of Dow COASOL are a mixture of diisobutyl succinate, diisobutyl glutarate, and diisobutyl adipate; the components of Dow COASOL 290 are a mixture of carboxylic esters, with a boiling - point range of 290 - 310 °C and a vapor pressure of 0.004 hPa. The film - forming aid of the present invention has good compatibility with the emulsion and high film - forming efficiency. At the same time, the specific type of film - forming aid of the present invention is not only more environmentally friendly but also enables the latex paint to have good washability, low - temperature film - forming property, and anti - cracking property for thick coatings.

[0033] Preferably, the preservative can control the growth of bacteria, fungi, and algae in industrial water systems and has the ideal properties of quickly killing microorganisms and rapidly degrading itself. It is preferably at least one of Thor's preservatives ACTICIDE DB20, preservative ACTICIDE CBM 2, and preservative ACTICIDE BW20.

[0034] Preferably, the mildew - proof agent has excellent broad - spectrum bactericidal properties against bacteria, molds, and yeasts. It has good stability and can provide long - lasting and long - term protection for the final product. It is preferably at least one of Thor's mildew - proof agents ACTICIDE ICB 3, mildew - proof agent ACTICIDE IPW 40, and mildew - proof agent ACTICIDE OTW.

[0035] Preferably, the antibacterial agent has broad - spectrum antibacterial activity, can kill and inhibit a variety of fungi and bacteria, can effectively inhibit Malassezia, and also has a certain inhibitory effect on some common molds such as Aspergillus niger and Penicillium, as well as yeasts. In industrial application scenarios, it can inhibit and kill microorganisms that may erode the coating, ensuring the performance and service life of the material. It is preferably Thor's antibacterial agent ACTICIDE ZPD1.

[0036] Specifically, the preservative, mildew - proof agent, and bactericide of the present invention form a green anti - corrosion system. Through their synergistic effect, the antibacterial and mildew - proof properties of the latex paint can be improved, and it is more environmentally friendly.

[0037] Preferably, the barium sulfate is ultrafine barium sulfate.

[0038] Preferably, the average particle size of the primary particles of the ultrafine barium sulfate is 0.01 - 0.08 mm, preferably BS115 of Guangfu Building Materials (Jiaoling) Refinement Co., Ltd., and its particle size distribution is extremely narrow.

[0039] The second aspect of the present invention provides a preparation method of the latex paint described in the first aspect of the present invention.

[0040] Specifically, the preparation method of the latex paint includes the following steps:

[0041] Mix the raw materials for preparing the latex paint to obtain the latex paint.

[0042] Preferably, the preparation method of the latex paint includes the following steps:

[0043] (1) Mix water, multifunctional additives, sepiolite, and bamboo charcoal powder, and then add barium sulfate, titanium dioxide, and calcium carbonate to obtain mixture 1;

[0044] (2) Add wax emulsion, dispersant, film-forming aid, and antifreeze to mixture 1 obtained in step (1) to obtain mixture 2;

[0045] (3) Add styrene-acrylic emulsion, defoamer, preservative, mildew-proof agent, and antibacterial agent to mixture 2 obtained in step (2) to obtain mixture 3;

[0046] (4) Add thickener to mixture 3 obtained in step (3) to obtain the latex paint.

[0047] The third aspect of the present invention provides an application of the latex paint described in the first aspect of the present invention in the construction field.

[0048] Compared with the prior art, the beneficial effects of the technical solution provided by the present invention are as follows:

[0049] (1) The present invention uses a paraffin-modified non-ionic oil-in-water emulsion as the wax emulsion, adopts a specific type of film-forming aid, and combines styrene-acrylic emulsion and sepiolite. Their combined action makes the latex paint have good washability, low-temperature film-forming property, and thick films are not easy to crack, and it has a good purification effect on formaldehyde, without releasing other harmful substances, being green and environmentally friendly.

[0050] (2) The present invention uses a specific styrene-acrylic emulsion, which can overcome steric hindrance, improve the saturation of formaldehyde-decomposing functional groups, reduce the use of film-forming substances, and has excellent initial and long-term formaldehyde-decomposing ability, far superior to ordinary polymer decorative materials. The formaldehyde purification rate meets the standard JC / T 1074 - 2008. At the same time, it can also improve the washability, gloss, and low-temperature film-forming property of the paint film, and thick films are not easy to crack. Description of the Drawings

[0051] Figure 1 It is a classification diagram of scratch resistance levels in the scratch resistance test. Detailed implementation manner

[0052] In order to make those skilled in the art more clearly understand the technical solutions of the present invention, the following examples are listed for illustration. It should be noted that the following examples do not limit the protection scope required by the present invention.

[0053] The raw materials, reagents or devices used in the following examples can be obtained from conventional commercial channels or can be obtained by existing known methods without special instructions.

[0054] The raw material components and dosages of the latex paints in Examples 1-3 of the present invention are shown in Table 1.

[0055] Table 1: Raw material components and dosages of the latex paints in Examples 1-3 (parts by mass)

[0056]

[0057]

[0058] Example 1

[0059] A latex paint, the raw material components and dosages of which are shown in Table 1.

[0060] The preparation method of the latex paint in Example 1 includes the following steps:

[0061] (1) Add pure water to the reaction vessel, and successively add the multifunctional auxiliary agent, sepiolite, and bamboo charcoal powder at a rotation speed of 450 rpm. Adjust the rotation speed to 1000 rpm, and successively add barium sulfate, titanium dioxide, calcium carbonate, and disperse for 15 minutes to obtain mixture 1;

[0062] (2) Adjust the rotation speed to 800 rpm, and successively add the wax emulsion, dispersant, film-forming auxiliary agent, and antifreeze agent to the mixture 1 obtained in step (1). After adding each component, disperse for 3 minutes to obtain mixture 2;

[0063] (3) At a rotation speed of 600 rpm, successively add the styrene-acrylic emulsion, defoaming agent, preservative, mildew-proof agent, and antibacterial agent to the mixture 2 obtained in step (2). Adjust the rotation speed according to the stirring state, and stir for 5 minutes after adding each component to obtain mixture 3;

[0064] (4) At a rotation speed of 900 rpm, add the thickening agent to the mixture 3 obtained in step (3). Adjust the rotation speed according to the stirring state, and stir for 10 minutes to obtain the latex paint.

[0065] Example 2

[0066] A latex paint, and the raw material components and dosages are shown in Table 1.

[0067] The preparation method of the latex paint in Example 2 is the same as that in Example 1.

[0068] Example 3

[0069] A latex paint, and the raw material components and dosages are shown in Table 1.

[0070] The preparation method of the latex paint in Example 3 is the same as that in Example 1.

[0071] Comparative Example 1

[0072] The difference between Comparative Example 1 and Example 1 is only that in Comparative Example 1, Nanjing Tianshi New Materials Technology Co., Ltd.'s PEW-2004 is used to replace the wax emulsion SECOLA WE2039 in Example 1 in equal amount. PEW-2004 is a water-based dispersion of polyethylene wax with high transparency and high wear resistance, and the others are the same as in Example 1.

[0073] Comparative Example 2

[0074] The difference between Comparative Example 2 and Example 1 is only that in Comparative Example 2, Bardahl 9009 is used to replace the Bardahl styrene-acrylic emulsion NPT-9909 in Example 1 in equal amount. In the Bardahl 9009 emulsion, the mass ratio of styrene / acrylic ester copolymer is 44-46%, and the others are the same as in Example 1.

[0075] Comparative Example 3

[0076] The difference between Comparative Example 3 and Example 1 is only that in Comparative Example 3, the film-forming aid uses the dodecyl alcohol ester of Dena to replace the Dow COASOL 290LPUS in Example 1 in equal amount. The component of the dodecyl alcohol ester of Dena is 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, the boiling point range is 255-260.5 °C, and the vapor pressure is 1.3 Pa, and the others are the same as in Example 1.

[0077] Comparative Example 4

[0078] The difference between Comparative Example 4 and Example 1 is only that in Comparative Example 4, attapulgite is used to replace sepiolite in Example 1 in equal amount, and the others are the same as in Example 1.

[0079] Comparative Example 5

[0080] The difference between Comparative Example 5 and Example 1 is only that in Comparative Example 5, the preservative is 0.07 parts of Dow BIOBAN 623A and 0.1 part of Dow BTNV2; the mildew-proof agent is 0.47 parts of Lanxess AA 248, and the antibacterial agent is 0.02 parts of Lanxess BIOX ABZ, and the others are the same as in Example 1.

[0081] Comparative Example 6

[0082] The difference between Comparative Example 6 and Example 1 is only that montmorillonite is used to replace the bamboo charcoal powder in Example 1 in equal amount, and the others are the same as in Example 1.

[0083] Performance Test

[0084] The scratch resistance and gloss of the latex paints of Example 1 and Comparative Example 1 were tested. The specific test methods are as follows:

[0085] Scratch resistance test: Use an asbestos-free fiber cement flat plate with dimensions of 430mm×150mm×(4 - 6)mm to make a plate. The product to be inspected should not be diluted. After stirring evenly, the plate specimen is made by the roller coating method; Use a roller to coat the specimen on the smooth surface of the test plate. After the roller coating is completed, place the long side of the test plate horizontally and the short side vertically at an angle of 85° to the horizontal plane. After placing for 6h, coat the second specimen in the same way; After preparation, the sample plate should be cured in an environment conforming to the provisions of GB / T 9278-2008 for 7d to obtain a paint film;

[0086] The test uses a stainless steel diamond ink knife with a blade tip thickness of about 0.4 - 0.5mm and a flat and defect-free blade tip. Use the stainless steel diamond ink knife to conduct a scratch resistance test on the paint film; During the test, the plane of the ink knife blade forms an angle of less than 45° with the test plate. Apply force evenly to slightly bend the ink knife, and then move it uniformly in the direction of the ink knife handle at a speed of about 5cm / s for 10cm, which is counted as one scratch; At least 5cm away from the previous test, repeat the scratch operation twice, observe the traces left on the test plate after three scratches, and take the most obvious trace as the result evaluation; According to the obviousness of the traces, it is divided into level 0 (no trace, the trace is difficult to be visually found after the scratch test), level 1 (slight trace, a faint black trace is visually seen after the scratch test), level 2 (shallower trace, the trace color is lighter after the scratch test), level 3 (medium trace, the trace color is medium after the scratch test), and level 4 (obvious trace, the trace is visually obvious after the scratch test); The classification of scratch resistance levels is as Figure 1 shown. Figure 1 Figures (a), (b), (c), (d), and (e) in it are respectively the effect diagrams of scratch resistance levels 0, 1, 2, 3, and 4.

[0087] Gloss test: Refer to the 60° and 85° gloss measurement methods in the determination of 20°, 60°, and 85° specular gloss of paint films of paints and varnishes without metallic pigments in GB / T 9754-2007.

[0088] The scratch resistance performance and gloss test results of the paint films of Example 1 and Comparative Example 1 are shown in Table 2.

[0089] Table 2: Performance test results of the latex paints of Example 1 and Comparative Example 1

[0090]

[0091] As can be seen from Table 2, the scratch resistance of the latex paint prepared with the paraffin-modified non-ionic oil-in-water emulsion in Example 1 of the present invention is significantly better than that of Comparative Example 1. This is because the wax emulsion of the present invention has a hydrophobic effect in water-based coatings, can improve adhesion, increase surface smoothness, resist scratching and wear, and can also improve the interfacial tension between latex particles, fill in and strengthen to achieve the function of anti-scratch and wear resistance.

[0092] The low-temperature film-forming property, film gloss, crack resistance, and washability of the latex paints of Example 1 and Comparative Example 2 were tested, and the test methods are as follows:

[0093] Gloss test: Refer to the 60° and 85° gloss measurement methods in the determination of 20°, 60° and 85° specular gloss of non-metallic pigment-containing paint films in GB / T 9754-2007 Paints and varnishes;

[0094] Low-temperature film-forming property: Test was carried out with reference to GB / T 9756-2018;

[0095] Anti-thick coating cracking property: Take a clean and dry white cardboard, mark the name of the product to be tested at the top of the board surface. Use a dropper to take 5 g of the diluted latex paint sample and drop it in the upper-middle part of the marked white cardboard; use a 500 μm wet film applicator to scrape and coat the film evenly from top to bottom on the white cardboard. Place the white cardboard with the scraped film in the initial drying anti-cracking instrument, adjust the wind speed to 3 ± 0.5 m / s, place it for 15 minutes, and then observe whether there is any cracking phenomenon on the film surface of the board surface;

[0096] Washability: Test was carried out with reference to the 5.4.14 washability method in HG / T 5065-2016 Architectural coatings - Clear coatings for overcoating;

[0097] Product purification effect: Test was carried out with reference to the industry standard JC / T 1074-2008 Indoor air purification functional coating materials - Purification performance;

[0098] Test for volatile organic compounds (VOC), total of benzene, toluene, ethylbenzene, and xylene, and free formaldehyde: Test was carried out with reference to the test method for the limit of harmful substances in coatings in GB / T35602-2017 Green product assessment.

[0099] The test results of the low-temperature film-forming property, film gloss, crack resistance, and washability of the latex paints of Example 1 and Comparative Example 2 are shown in Table 3.

[0100] Table 3: Test results of the performance of the latex paints of Example 1 and Comparative Example 2

[0101]

[0102] As can be seen from Table 3, Example 1 uses a specific styrene-acrylic emulsion, making the gloss, low-temperature film-forming property, anti-cracking property for thick coating, washability, and purification effect of the latex paint in Example 1 significantly better than those of Comparative Example 2, and it is more environmentally friendly. This is because the specific styrene-acrylic emulsion in Example 1 has excellent interlayer adhesion, water and alkali resistance, as well as excellent chemical stability and calcium ion stability, and excellent formaldehyde purification ability, which can obtain excellent washability and the effect that the paint film can be thickly coated without cracking, as well as purification effect and environmental performance.

[0103] The low-temperature film-forming property, film anti-cracking property, washability, volatile organic compounds (VOCs), benzene, toluene, ethylbenzene, total xylene, and free formaldehyde of the latex paints in Example 1 and Comparative Example 3 were tested, and the test methods were the same as above.

[0104] The performance test results of the latex paints in Example 1 and Comparative Example 3 are shown in Table 4.

[0105] Table 4: Performance test results of the latex paints in Example 1 and Comparative Example 3

[0106] Test item Example 1 Comparative example 3 Low-temperature film-forming property No cracking at 5°C No cracking at 5°C Anti-thick coating cracking property No cracking for 600μm plate preparation No cracking for 600μm plate preparation Washability No breakage after 10,000 times 7300 times Volatile organic compounds (VOC) (g / L) Not detected 46 Sum of benzene, toluene, ethylbenzene, and xylene (mg / kg) Not detected 9 Free formaldehyde (mg / kg) Not detected Not detected

[0107] As can be seen from Table 4, Example 1 uses a specific film-forming aid, making the washability and environmental friendliness of the latex paint in Example 1 significantly better than those of Comparative Example 3. It shows that the specific film-forming aid used in the present invention is not only more environmentally friendly, but also enables the latex paint to have good washability, low-temperature film-forming property, and anti-cracking property for thick coating at the same time.

[0108] The latex paints in Example 1 and Comparative Example 4 were tested, and the test items and test methods are as follows:

[0109] State in the container: Tested with reference to 5.3 in GB / T 9756-2009;

[0110] The low-temperature film-forming property, film anti-cracking property for thick coating, and washability of the latex paint are the same as above;

[0111] Skin formation, corrosion, and spoilage: Tested with reference to GB / T 6753.3-1986;

[0112] Settling condition: Tested with reference to GB / T 6753.3-1986;

[0113] Water separation: After putting the sample in a 500 mL jar, tighten the lid to seal it, store it in an oven at 55 °C for two weeks, open the lid, and use the visual inspection method to observe whether there are phenomena such as stratification, precipitation, and skin formation. If there is a clear liquid on the upper layer and a viscous substance on the lower layer, it can be preliminarily judged that there is water separation;

[0114] Presence of tofu-like lumps: After placing the sample in a 500 mL jar, tighten the lid to seal it, store it in an oven at 55 °C for two weeks. Open the lid, use a stainless steel diamond-shaped ink knife to pick up the latex paint, and by visual inspection, directly observe the surface and internal state of the latex paint to check for obvious lumps, and whether their shape, size, and texture are similar to those of tofu cubes;

[0115] Fluidity: Prepare a smooth inclined plate, place a certain amount of latex paint sample at one end of the inclined plate, tilt the inclined plate to allow the latex paint to flow naturally under the action of gravity, and observe the flow of the latex paint, such as the flow rate, whether it can spread evenly on the inclined plate, and whether there are stagnation or accumulation phenomena. The fluidity can be evaluated by measuring the distance the latex paint flows within a certain time or by recording the time it takes for the latex paint to flow from one end of the inclined plate to the other end.

[0116] The test results of the latex paint performance in Example 1 and Comparative Example 4 are shown in Table 5.

[0117] Table 5: Test results of the latex paint performance in Example 1 and Comparative Example 4

[0118]

[0119] As can be seen from Table 5, sepiolite is used in Example 1, making the storage stability of the latex paint in Example 1 significantly better than that in Comparative Example 4. This is because sepiolite has excellent thixotropy and pseudoplasticity, which can improve the stability and spreading performance of the system. In the static state, it can make the system have a high consistency, produce a suspension effect and have strong anti-settling properties, avoid precipitation, control the fluidity and consistency of the system, and ensure the optimal distribution of solvents, fillers, and other components, so as to achieve the effect of stable state, no sedimentation, no agglomeration, and no water separation of the product during long-term storage.

[0120] The latex paint in Example 1 and Comparative Example 5 was tested, and the test items and test methods are as follows:

[0121] Antibacterial performance, antibacterial durability performance, antifungal performance, antifungal durability performance: Test according to Appendix A of HGT 3950-2007;

[0122] Volatile organic compounds (VOC) (g / L), total of benzene, toluene, ethylbenzene, and xylene (mg / kg), and free formaldehyde (mg / kg): Test according to the limit of harmful substances in coatings in GB / T 35602-2017 "Evaluation of Green Products".

[0123] The test results of the latex paint performance in Example 1 and Comparative Example 5 are shown in Table 6.

[0124] Table 6: Test results of the latex paint performance in Example 1 and Comparative Example 5

[0125]

[0126] As can be seen from Table 6, the antibacterial, antifungal and persistence properties of the latex paint in Example 1 of the present invention are all superior to those of Comparative Example 5, and there is no release of free formaldehyde and other harmful substances. It shows that the specific anti-corrosion system adopted in the present invention has better antibacterial and antifungal effects and is more environmentally friendly.

[0127] The latex paints of Example 1 and Comparative Example 6 were tested. Among them, the test methods for gloss, low-temperature film-forming property, anti-thick coating cracking property, washability, and product purification effect are the same as above.

[0128] The performance test results of the latex paints of Example 1 and Comparative Example 6 are shown in Table 7.

[0129] Table 7: Performance test results of the latex paints of Example 1 and Comparative Example 6

[0130]

[0131] As can be seen from Table 7, the purification performance of the latex paint in Example 1 of the present invention for formaldehyde and toluene is significantly superior to that of Comparative Example 6.

[0132] In addition, the latex paints of Examples 2-3 of the present invention also have good washability, scratch resistance, low-temperature film-forming property, anti-thick film cracking property, storage stability, good gloss, good adsorption and decomposition effects on formaldehyde, and are more environmentally friendly.

[0133] In summary, the present invention uses a paraffin-modified non-ionic oil-in-water emulsion as the wax emulsion, specific types of film-forming aids, specific types of styrene-acrylic emulsions, and combines sepiolite and other components to act together, so that the latex paint has good washability, scratch resistance, low-temperature film-forming property, anti-thick film cracking property, storage stability, good gloss, good adsorption and decomposition effects on formaldehyde, no release of free formaldehyde and other harmful substances, and is more environmentally friendly.

[0134] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A latex paint, characterized in that, It includes styrene-acrylic emulsion, wax emulsion, sepiolite, and additives; The mass ratio of styrene / acrylic ester copolymer in the styrene-acrylic emulsion is 47-49%. The wax emulsion includes a paraffin-modified nonionic oil-in-water emulsion; The additives include film-forming aids; the film-forming aids include at least one of diisobutyl ester compounds and carboxylic ester compounds.

2. The latex paint according to claim 1, wherein, The wax emulsion includes paraffin and fatty alcohol polyoxyethylene ether.

3. The latex paint according to claim 1, characterized in that, By mass, the latex paint includes 28-45 parts of styrene-acrylic emulsion, 4.5-9 parts of wax emulsion, 0.18-0.45 parts of sepiolite, and 0.9-2.2 parts of film-forming aids.

4. The latex paint according to any one of claims 1 to 3, characterized in that, The latex paint also includes pigments and fillers and water.

5. The latex paint according to claim 4, characterized in that, The additives also include at least one of bamboo charcoal powder, dispersant, antifreeze, defoamer, multifunctional additive, thickener, preservative, mildew-proof agent, and antibacterial agent; and / or, the pigments and fillers include at least one of calcium carbonate, barium sulfate, and titanium dioxide.

6. The latex paint according to claim 5, characterized in that, The additives also include bamboo charcoal powder, dispersant, antifreeze, defoamer, multifunctional additive, thickener, preservative, mildew-proof agent, and antibacterial agent; the pigments and fillers include calcium carbonate, barium sulfate, and titanium dioxide; and by mass, the latex paint includes 28-45 parts of styrene-acrylic emulsion, 4.5-9 parts of wax emulsion, 0.18-0.45 parts of sepiolite, 0.01-0.02 parts of bamboo charcoal powder, 0.45-1.1 parts of dispersant, 0.18-0.65 parts of antifreeze, 0.9-2.2 parts of defoamer, 0.13-0.38 parts of multifunctional additive, 3.5-6.5 parts of thickener, 0.9-2.2 parts of film-forming aids, 0.13-0.55 parts of preservative, 0.35-0.9 parts of mildew-proof agent, 0.02-0.04 parts of antibacterial agent, 13-33 parts of calcium carbonate, 1.8-7.5 parts of barium sulfate, 1-5 parts of titanium dioxide, and 12-28 parts of water.

7. The latex paint according to claim 5, wherein, The antifreeze includes alcohol-based antifreeze; and / or, the defoamer includes polymer composite mineral oil-based defoamer; and / or, the multifunctional additive includes amine-based additives; and / or, the thickener includes hydrophobically modified associative thickener.

8. The preparation method of the latex paint according to any one of claims 1-7, characterized in that, It includes the following steps: Mix the raw materials for preparing the latex paint to obtain the latex paint.

9. The preparation method according to claim 8, characterized in that, It includes the following steps: (1) Mix water, multifunctional additive, sepiolite, and bamboo charcoal powder, and then add barium sulfate, titanium dioxide, and calcium carbonate to obtain mixture 1; (2) Add wax emulsion, dispersant, film-forming aids, and antifreeze to the mixture 1 obtained in step (1) to obtain mixture 2; (3) Add styrene-acrylic emulsion, defoamer, preservative, mildew-proof agent, and bactericide to the mixture 2 obtained in step (2) to obtain mixture 3; (4) Add thickener to the mixture 3 obtained in step (3) to obtain the latex paint.

10. Application of the latex paint according to any one of claims 1-7 in the construction field.

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