Asbestos-free interior wall finishing paint, its preparation method and application

Abstract

The application relates to the technical field of building materials, and particularly discloses an asbestos-free interior wall decorative coating as well as a preparation method and application thereof. The asbestos-free interior wall decorative coating comprises the following components in parts by weight: 1200-1300 mesh superfine heavy calcium powder 212-240 parts, 700-800 mesh heavy calcium powder 438-460 parts, nano titanium dioxide 43-56 parts, latex 10-14 parts, calcium hydroxide 135-165 parts, white bamboo charcoal 87-108 parts, HEMC hydroxyethyl methyl cellulose 5-9 parts, sodium polyacrylate 1-3 parts, silicon dioxide 0.6-1.4 parts, aerogel 1.4-2.6 parts and water 380-400 parts. The application further discloses a preparation method of the coating. The formula raw materials provided by the application can be used to obtain the coating which is sterilized and mildew-proof, and has strong anti-cracking property.

Description

Technical Field

[0001] This application relates to the technical field of building materials, specifically to an asbestos-free interior wall coating, its preparation method, and its application. Background Technology

[0002] Interior wall coatings can be applied directly to wall surfaces without the need for subsequent latex paint application. They offer a quick, economical, and effective way to achieve a smooth, durable, and decorative finish. In recent years, interior wall coatings have become increasingly popular in interior decoration due to their superior properties, including high strength, high hardness, good water resistance, and good stain resistance.

[0003] New requirements have been introduced for interior wall coatings, such as the ability to kill bacteria, deodorize, and prevent mold. Researchers have reported that adding photocatalysts to interior wall coatings utilizes photocatalytic reactions to generate highly oxidizing hydroxyl and oxygen free radicals, which can induce oxidation reactions in various microorganisms, thereby inhibiting and eliminating microorganisms, mold, and bacteria on the coating surface. However, the addition of these photocatalysts to interior wall coatings can easily create height differences between material particles, reducing adhesion strength and leading to cracking. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides an asbestos-free interior wall coating, its preparation method, and its application.

[0005] An asbestos-free interior wall coating adopts the following technical solution:

[0006] An asbestos-free interior wall coating comprises the following components in parts by weight: 212-240 parts of 1200-1300 mesh ultrafine heavy calcium carbonate powder, 438-460 parts of 750-850 mesh heavy calcium carbonate powder, 43-56 parts of nano titanium dioxide, 10-14 parts of latex, 135-165 parts of calcium hydroxide, 87-108 parts of white bamboo charcoal, 5-9 parts of HEMC hydroxyethyl methyl cellulose, 1-3 parts of sodium polyacrylate, 0.6-1.4 parts of silica, 1.4-2.6 parts of aerogel, and 380-400 parts of water.

[0007] Using the above-mentioned formula and raw materials provided in this application, the prepared asbestos-free interior wall coating has bactericidal and mildew-proof effects. In addition, the coating has strong adhesion strength and will not shrink or crack with changes in external conditions, thus improving the bactericidal and mildew-proof performance of the asbestos-free interior wall coating and providing good durability.

[0008] The asbestos-free interior wall coating provided in this application contains nano-titanium dioxide, which undergoes a photocatalytic reaction under natural light and fluorescent light to generate free hydroxyl radicals and active oxygen. This generates strong photo-oxidation and reduction capabilities, capable of oxidizing and decomposing various organic compounds and some inorganic substances. It can destroy bacterial cell membranes and solidify viral proteins, killing bacteria and decomposing organic pollutants into harmless water and carbon dioxide. Therefore, the asbestos-free interior wall coating prepared in this application has bactericidal, deodorizing, mildew-proof, stain-resistant, self-cleaning, and air-purifying effects, while avoiding harm to the human body and reducing the incidence of pneumoconiosis and lung cancer.

[0009] This application uses heavy calcium carbonate, white bamboo charcoal, silica, and aerogel simultaneously. The silica and aerogel, with their fine porous structures, attract the irregularly shaped suspended heavy calcium carbonate and white bamboo charcoal, making the coating more uniform overall. After hydration, it is easier to stir evenly and has better fluidity. Furthermore, the attraction of heavy calcium carbonate and white bamboo charcoal by silica and aerogel helps to form a well-ordered structural arrangement, enhancing the adhesion between particles. This, in turn, promotes a denser coating structure after film formation, stronger adhesion between coating systems, better anti-sagging performance, prevents cracking of the coating, and improves the coating's durability.

[0010] This application conducted extensive experiments on the specifications and dosage of the heavy calcium carbonate powder used, and found that when the above-mentioned scheme was selected, it achieved unexpected positive effects: the large particles of heavy calcium carbonate powder can accelerate the diffusion rate of coating components and enhance the skeleton strength of the coating, greatly improving the adhesion effect of the coating. If larger particles of heavy calcium carbonate powder are selected, the calcium carbonate will lead to an increase in the average particle size of the coating powder, affecting the particle size uniformity of the coating powder, and easily causing height differences between coating powder particles, thus producing cracks; on the other hand, if the particle size of heavy calcium carbonate powder is insufficient, the skeleton strength of the coating powder will be insufficient, the particles between the coating powder will be dispersed and difficult to agglomerate, resulting in uneven average particle size of the coating powder, easily causing height differences between coating powder particles, thus producing cracks; and the weight ratio of large and small heavy calcium carbonate powder particles also affects the height difference between coating powder particles, affecting the adhesion strength between coating powder particles.

[0011] Optionally, the asbestos-free interior wall coating comprises the following components in parts by weight: 220-232 parts of 1200-1300 mesh ultrafine heavy calcium carbonate powder, 444-456 parts of 700-800 mesh heavy calcium carbonate powder, 48-52 parts of nano titanium dioxide, 11-13 parts of latex, 135-165 parts of calcium hydroxide, 87-108 parts of white bamboo charcoal, 5-9 parts of HEMC hydroxyethyl methyl cellulose, 1-3 parts of sodium polyacrylate, 0.6-1.4 parts of silica, 1.4-2.6 parts of aerogel, and 380-400 parts of water.

[0012] Preferably, the particle size of the nano-titanium dioxide is 20-100 nm.

[0013] Furthermore, the particle size of the nano-titanium dioxide is 20-50 nm.

[0014] Optionally, the latex is selected from one or more of acrylamide-styrene copolymer, vinyl acetate-higher fatty acid vinyl ester copolymer, silicone-acrylic emulsion, pure acrylic emulsion, and styrene-acrylic emulsion.

[0015] Preferably, the latex is composed of a mixture of acrylamide-styrene copolymer and pure acrylic emulsion.

[0016] Furthermore, the latex is composed of an acrylamide-styrene copolymer and pure acrylic emulsion in a weight ratio of (5-9):(1-3).

[0017] Furthermore, the latex is composed of an acrylamide-styrene copolymer and pure acrylic emulsion in a weight ratio of (6-8):(1-3).

[0018] Furthermore, the viscosity of the pure acrylic emulsion is 100-500 mPa·s, and the glass transition temperature is 30-35℃.

[0019] The polymer latex used in this application allows for a denser coating of asbestos-free interior wall finishes, improving their adhesion strength, water resistance, and moisture resistance, as well as enhancing and optimizing their appearance. Through optimization of the type and amount of latex used, this application further improves the adhesion strength of the coating.

[0020] Preferably, the silicon dioxide is fumed silicon dioxide with a particle size of 600-800 mesh.

[0021] On the other hand, this application provides a method for preparing the above-mentioned asbestos-free interior wall coating, which specifically includes the following steps: weighing the raw materials by weight; adding the latex and the nano titanium dioxide sequentially to water at 20-40℃ and 500-1000r / min, while stirring and adding the materials, and mixing to obtain a liquid material;

[0022] The remaining raw materials are added to the liquid material in sequence and mixed evenly to obtain the asbestos-free interior wall coating.

[0023] In the process of preparing asbestos-free interior wall coatings, the applicant found that the order of adding raw materials has a significant impact on the performance of the coating. This application optimizes the order of adding raw materials to make the prepared asbestos-free interior wall coatings have strong bactericidal and mildew-proof properties, as well as high bonding strength.

[0024] Thirdly, this application also provides the application of the aforementioned asbestos-free interior wall coatings in building materials.

[0025] In summary, the technical solution of this application has the following effects:

[0026] This application uses nano-titanium dioxide as a bactericidal and mildew-proof material, and simultaneously adds heavy calcium carbonate, white bamboo charcoal, silica, and aerogel, while controlling the amount of each raw material added. The resulting asbestos-free interior wall coating has bactericidal and mildew-proof effects, and the coating has strong adhesion strength and will not shrink or crack with changes in external conditions, thus improving the bactericidal and mildew-proof performance of the asbestos-free interior wall coating, and has a good long-lasting effect.

[0027] This application further improves the bonding strength of the coating by screening and optimizing the specifications of heavy calcium carbonate, titanium dioxide and silicon dioxide and the types of latex.

[0028] The asbestos-free interior wall coating provided in this application is an asbestos-free material, which avoids the inhalation of fine fibers from asbestos into the human body, thereby preventing harm to the human body and reducing the occurrence of pneumoconiosis and lung cancer. Detailed Implementation

[0029] The present application will be further described in detail below with reference to embodiments, comparative examples and performance test results. These embodiments should not be construed as limiting the scope of protection claimed in this application.

[0030] Acrylamide-styrene copolymer was purchased from Hubei Shishun Biotechnology Co., Ltd.; S-01 styrene-acrylic emulsion, S-05 pure acrylic emulsion (pure acrylic emulsion viscosity 300-1200 mpa.s, glass transition temperature 12-22℃), SD-528 silicone-acrylic emulsion, and SD-168 pure acrylic emulsion (pure acrylic emulsion viscosity 100-500 mpa.s, glass transition temperature 30-35℃) were all purchased from Jiangsu Shengda New Material Technology Co., Ltd.

[0031] Example

[0032] Examples 1-5

[0033] Examples 1-5 each provide an asbestos-free interior wall coating.

[0034] The difference in the above embodiments is that the amount of each component in the asbestos-free interior wall coating is different, as shown in Table 1.

[0035] The preparation method of the asbestos-free interior wall coating in the above embodiments is as follows:

[0036] Weigh each raw material according to the weight proportions shown in Table 1; under the conditions of 30±3℃ and 750±50r / min, add the latex (the latex is composed of a mixture of acrylamide-styrene copolymer and S-168 pure acrylic emulsion in a weight ratio of 7:2) and nano titanium dioxide to water in sequence while stirring and adding the materials to obtain a liquid.

[0037] Add the remaining raw materials to the liquid material in sequence and mix well to obtain asbestos-free interior wall coating.

[0038] Table 1. Dosage of each component in the asbestos-free interior wall coatings of Examples 1-5

[0039]

[0040] Examples 6-9

[0041] Examples 6-9 each provide an asbestos-free interior wall coating.

[0042] The difference between the above embodiments and Embodiment 1 lies in the particle size of the nano-titanium dioxide, as detailed below:

[0043] In Example 6: the particle size of nano-titanium dioxide is 10 nm.

[0044] In Example 7: the particle size of nano-titanium dioxide is 20 nm.

[0045] In Example 8: the particle size of nano-titanium dioxide is 50 nm.

[0046] In Example 9: the particle size of nano-titanium dioxide is 100 nm.

[0047] The preparation methods of the remaining raw materials and asbestos-free interior wall coatings in the above embodiments are the same as those in Example 1.

[0048] Examples 10-16

[0049] Examples 10-16 each provide an asbestos-free interior wall coating.

[0050] The difference between the above embodiments and Embodiment 1 lies in the type of latex, as detailed below:

[0051] In Example 10: the latex is an acrylamide-styrene copolymer.

[0052] In Example 11: the latex is S-168 pure acrylic emulsion.

[0053] In Example 12: the latex is composed of a copolymer of vinyl acetate and higher fatty acid vinyl ester in a weight ratio of 7:2 and pure acrylic emulsion S-168.

[0054] In Example 13: the latex was composed of a mixture of acrylamide-styrene copolymer and S-01 styrene-acrylic emulsion in a weight ratio of 7:2.

[0055] In Example 14: the latex was composed of a mixture of acrylamide-styrene copolymer and S-05 pure acrylic emulsion in a weight ratio of 7:2.

[0056] In Example 15: the latex was composed of a mixture of acrylamide-styrene copolymer and S-168 pure acrylic emulsion in a weight ratio of 5:3.

[0057] In Example 16: the latex was composed of an acrylamide-styrene copolymer and S-168 pure acrylic emulsion in a weight ratio of 9:1.

[0058] The preparation methods of the remaining raw materials and asbestos-free interior wall coatings in the above embodiments are the same as those in Example 1.

[0059] Examples 17-19

[0060] Examples 17-19 each provide an asbestos-free interior wall coating.

[0061] The difference between the above embodiments and Embodiment 1 lies in the type of silicon dioxide, as detailed below:

[0062] In Example 17: the silicon dioxide is 700-mesh precipitated silicon dioxide.

[0063] In Example 18: the silicon dioxide is 500 mesh fumed silicon dioxide.

[0064] In Example 19: the silicon dioxide is 900 mesh fumed silicon dioxide.

[0065] The preparation methods of the remaining raw materials and asbestos-free interior wall coatings in the above embodiments are the same as those in Example 1.

[0066] Comparative Example

[0067] Comparative Examples 1-6

[0068] Comparative Examples 1-6 each provide an asbestos-free interior wall coating.

[0069] The differences between the above comparative example and Example 1 are as follows: the dosage of each component in the asbestos-free interior wall coating is different, as shown in Table 2.

[0070] Table 2 shows the dosage of each component in asbestos-free interior wall coatings used in Comparative Examples 1-6.

[0071]

[0072]

[0073] The preparation method of the asbestos-free interior wall coating in the above comparative examples is the same as that in Example 1.

[0074] Comparative Example 7

[0075] Comparative Example 7 provides an asbestos-free interior wall coating.

[0076] The difference between this comparative example and Example 1 is that the preparation method of the asbestos-free interior wall coating is as follows: weigh each raw material by weight; add sodium polyacrylate and nano titanium dioxide to water in sequence under the conditions of 30±3℃ and 750±50r / min, while stirring and adding the materials, and mix well to obtain liquid material;

[0077] Add the remaining raw materials to the liquid material in sequence and mix well to obtain asbestos-free interior wall coating.

[0078] In this comparative example, the amounts of each raw material used in the asbestos-free interior wall coating are the same as in Example 1.

[0079] Comparative Example 8

[0080] Comparative Example 8 provides an asbestos-free interior wall coating.

[0081] The difference between this comparative example and Example 1 is that the preparation method of the asbestos-free interior wall coating is as follows: weigh each raw material according to the weight parts; under the conditions of 30±3℃ and 750±50r / min, add ultrafine heavy calcium carbonate powder, heavy calcium carbonate powder, calcium hydroxide, nano titanium dioxide, white bamboo charcoal, latex, sodium polyacrylate, silicon dioxide and aerogel to water in sequence while stirring, and mix well to obtain liquid material, which is the asbestos-free interior wall coating.

[0082] In this comparative example, the amounts of each raw material used in the asbestos-free interior wall coating are the same as in Example 1.

[0083] Performance testing method: The asbestos-free interior wall coatings in the examples and comparative examples were formed into test blocks, each measuring 5×5cm, and then the following performance tests were performed.

[0084] Test 1: Testing of workability, appearance, and hazardous substance performance

[0085] The specific testing methods and results are shown in Table 3.

[0086] Table 3. Test results of construction performance, appearance performance, and hazardous substance performance of asbestos-free interior wall coatings in Examples 1-19

[0087]

[0088] Based on the test results in Table 3, the asbestos-free interior wall coating provided in this application has excellent workability and appearance performance, and the content of harmful substances in the asbestos-free interior wall coating is low, all of which meet the performance requirements for asbestos-free interior wall coatings in this field.

[0089] Experiment 2: Antibacterial performance test

[0090] (1) Antibacterial performance test: Staphylococcus aureus and Escherichia coli were used as test strains, and the antibacterial ability of the samples was tested in accordance with the requirements of GB / T21866-2008 standard.

[0091] (2) Antifungal performance test: Aspergillus niger, Aspergillus terreus, Penicillium wanensis, Penicillium cordiformis, budding short-stemmed mold, and Chaetomium globulus were used as test strains, and the antifungal ability of the samples was tested in accordance with the requirements of HG / T 3950-2007 standard.

[0092] The mold growth level of the samples is assessed as follows:

[0093] Grade 0 means no growth is observed under a microscope (50x magnification);

[0094] Grade 1 trace growth, which is visible to the naked eye, but the growth coverage area is less than 10%;

[0095] Level 2 growth covers an area of ​​more than 10%.

[0096] (3) Durability test: A 30W UV lamp with a wavelength of 253.7nm was used. The UV lamp conforms to GB 19258. The test plate was 0.8m-1.0m away from the UV lamp and irradiated for 100h. After treatment, the test plate was subjected to antibacterial and antifungal tests according to the above method.

[0097] Test results are shown in Table 4.

[0098] Test 3: Bond strength

[0099] The adhesive strength of the specimens in the standard condition (untreated) and after immersion in water (immersion for 48 hours and drying for 4 hours) shall be tested in accordance with the requirements of JG / T 298-2010 6.12.

[0100] Test results are shown in Table 4.

[0101] Table 4 Performance test results of asbestos-free interior wall coatings in Examples 1-19 and Comparative Examples 1-8

[0102]

[0103]

[0104] Based on the test results in Table 4, it can be seen that the asbestos-free interior wall coating prepared using the formula raw materials provided in this application has bactericidal and mildew-proof effects. In addition, the coating has strong bonding strength and will not shrink or crack with changes in the external environment, thus improving the bactericidal and mildew-proof performance of the asbestos-free interior wall coating and providing good durability.

[0105] The specifications and dosage of heavy calcium carbonate in Comparative Examples 1-3 do not meet the requirements of this application. The asbestos-free interior wall coatings prepared underwent aging treatment, resulting in reduced bonding strength and easy cracking, which greatly reduced the bactericidal and mildew-proof properties of the asbestos-free interior wall coatings.

[0106] In Comparative Examples 7-8, the order of adding raw materials had a significant impact on the performance of the coating during the preparation of asbestos-free interior wall coatings. The prepared asbestos-free interior wall coatings had low bactericidal and antifungal properties, as well as low bonding strength.

[0107] By comparing Examples 1-5 and Comparative Examples 4-6, the applicant found that the amount of each raw material component in the coating has a significant impact on the performance of the coating. Therefore, this application reasonably controls the amount of each raw material component.

[0108] By comparing the test results of Example 1 and Examples 6-9, it was found that when the particle size of nano-titanium dioxide is lower than 20nm or higher than 50nm, the bonding strength of the coating is low; therefore, this application selects titanium dioxide with a particle size of 20-50nm as the raw material.

[0109] By comparing the test results of Example 1 with those of Examples 10-16, this application selected an acrylamide-styrene copolymer and pure acrylic emulsion in a weight ratio of (5-9):(1-3) as the raw material for the coating, which further improved the bonding strength of the asbestos-free interior wall coating.

[0110] By comparing the test results of Example 1 with those of Examples 17-19, this application selected fumed silica with a particle size of 600-800 mesh as the raw material for the coating, which further improved the bonding strength of the asbestos-free interior wall coating.

[0111] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. An asbestos-free interior wall finishing coating, characterized in that, Components including the following weight parts: 1200-1300 mesh superfine heavy calcium powder 212-240 parts, 750-850 mesh heavy calcium powder 438-460 parts, nano titanium dioxide 43-56 parts, latex 10-14 parts, calcium hydroxide 135-165 parts, white bamboo charcoal 87-108 parts, HEMC hydroxyethyl methyl cellulose 5-9 parts, sodium polyacrylate 1-3 parts, silicon dioxide 0.6-1.4 parts, aerogel 1.4-2.6 parts, water 380-400 parts; The particle size of the nano titanium dioxide is 20-50 nm; The latex is composed of acrylamide-styrene copolymer and pure acrylic emulsion with a weight ratio of (5-9) : (1-3) ; The silicon dioxide is fumed silica with a particle size of 600-800 mesh; The preparation method of the asbestos-free interior wall finish coating, specifically Comprising the following steps: taking raw materials by weight parts; under the condition of 20-40 DEG C, 500-1000 r / min of rotation speed, the latex and the nano titanium dioxide are added into water in sequence, and the materials are added while stirring, and mixed uniformly to obtain liquid materials; The remaining raw material substances are added into the liquid materials in sequence, and mixed uniformly, thereby obtaining the asbestos-free interior wall finish coating.

2. The asbestos-free interior wall finish coating according to claim 1, characterized in that Components including the following weight parts: 1200-1300 mesh superfine heavy calcium powder 212-240 parts, 750-850 mesh heavy calcium powder 438-460 parts, nano titanium dioxide 43-56 parts, latex 10-14 parts, calcium hydroxide 135-165 parts, white bamboo charcoal 87-108 parts, HEMC hydroxyethyl methyl cellulose 5-9 parts, sodium polyacrylate 1-3 parts, silicon dioxide 0.6-1.4 parts, aerogel 1.4-2.6 parts, water 380-400 parts; 3. A process for the preparation of an asbestos-free interior wall finishing coating according to any one of claims 1-2, characterized in that, Specifically comprising the following steps: taking raw materials by weight parts; under the condition of 20-40 DEG C, 500-1000 r / min of rotation speed, the latex and the nano titanium dioxide are added into water in sequence, and the materials are added while stirring, and mixed uniformly to obtain liquid materials; The remaining raw material substances are added into the liquid materials in sequence, and mixed uniformly, thereby obtaining the asbestos-free interior wall finish coating.

4. The asbestos-free interior wall finish coating according to any one of claims 1-2 in the application of building materials.

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