An indoor inorganic mineral coating with flame retardant function and its manufacturing method

Abstract

The invention provides an indoor inorganic mineral coating with flame retardant function and a preparation method thereof, belonging to the technical field of coatings. The coating comprises the following components by weight: 10-17 parts of silicate, 8-15 parts of porous SiO2 tubes, 4-7 parts of calcium carbonate, 0.5-1 parts of emulsifier, 4-9 parts of silicon phosphate, 6-9 parts of calcium bicarbonate, 2-5 parts of bentonite, 2-4 parts of water-soluble phenolic resin, 1-3 parts of pentaerythritol, 1-3 parts of mineral dyes and 40-60 parts of water. The invention ensures that the prepared coating can still maintain excellent adhesion at high temperature and has excellent fire retardant properties.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and particularly relates to an indoor inorganic mineral coating with flame retardant function and a manufacturing method thereof. Background Art

[0002] Coatings are an important decorative material, which are convenient for providing functions such as decoration, fire prevention, and anti-corrosion for buildings and indoor surfaces. Coatings can be divided into two categories: organic coatings and inorganic coatings. Among them, inorganic coatings are a type of coating with inorganic materials as the main film-forming substances (the organic film-forming substances usually do not exceed 5%), and usually have advantages such as low VOC content and good mildew and antibacterial properties, so they are more favored and recognized by consumers.

[0003] Inorganic coatings are mainly prepared by using inorganic components such as silicates and phosphates as substrates and adding certain auxiliaries and pigments. These substances form a firm coating in the coating, playing a protective role for the substrate; at the same time, the flame retardant performance is also mainly provided by these inorganic components.

[0004] However, due to the difference in the thermal expansion coefficients of inorganic coatings and substrates, when the temperature rises, due to different degrees of expansion, the bonding force between the coating and the substrate will be weakened, resulting in a decrease in the adhesion of the coating, and the decrease in the adhesion between the coating and the substrate will inevitably cause the coating to be more likely to peel off in a combustion / high-temperature environment, affecting the fire prevention and flame retardant performance. Summary of the Invention

[0005] To solve the problems in the background art, the present invention provides an indoor inorganic mineral coating with flame retardant function and a manufacturing method thereof, ensuring that the prepared coating can still maintain excellent adhesion at high temperatures and has excellent fire prevention and flame retardant performance.

[0006] To achieve the above object, in the first aspect, the present invention provides an indoor inorganic mineral coating with flame retardant function, which comprises the following components in parts by weight: 10-17 parts of silicate, 8-15 parts of porous SiO 2 tube, 4-7 parts of calcium carbonate, 0.5-1 part of emulsifier, 4-9 parts of silicon phosphate, 6-9 parts of calcium bicarbonate, 2-5 parts of bentonite, 2-4 parts of water-soluble phenolic resin, 1-3 parts of pentaerythritol, 1-3 parts of mineral dye, and 40-60 parts of water.

[0007] Further, the water-soluble phenolic resin has the model of YHY5211, its solid content is 35-37%, and its viscosity is 12-17 mps.

[0008] Further, the preparation method of the porous SiO 2 tube is as follows:

[0009] A1. Disperse 2 g of carbon nanotubes in 600 mL of an ethanol solution of polyvinylpyrrolidone, stir for 12 h, and perform centrifugal separation to obtain modified carbon nanotubes;

[0010] A2. Disperse the modified carbon nanotubes obtained in A1 (2 g) in 900 mL of an ethanol-ammonia aqueous solution, and ultrasonicate for 40 min to obtain a first mixed solution;

[0011] A3. Add 6.2 g of cetyltrimethylammonium bromide to the first mixed solution obtained in A2, ultrasonicate for 20 min, and stir for 2 h to obtain a second mixed solution;

[0012] A4. Add 11 mL of tetraethyl orthosilicate to the second mixed solution obtained in A3, and stir for 8 h to obtain a third mixed solution;

[0013] A5. Centrifuge and wash the third mixed solution obtained in A4 three times with an ethanol solution, dry it, and calcine it in a muffle furnace at 550 °C for 6 h to obtain the porous SiO 2 tube.

[0014] Further, in A1, in every 100 mL of the ethanol solution of polyvinylpyrrolidone, 1.5 g of polyvinylpyrrolidone is contained.

[0015] Further, in A2, the molar ratio of NH 3 , ethanol and water in the ethanol-ammonia aqueous solution is 1:(30 - 32):(250 - 265).

[0016] Further, the silicate includes sodium silicate and / or potassium silicate.

[0017] Further, the mineral dye includes any one of iron red, iron yellow, iron black, ultramarine, and copper green.

[0018] Further, the emulsifier includes any one of dodecyl aminopropionic acid, cocoyl glutamate, and sodium lauroyl sarcosinate.

[0019] In the second aspect, the present invention provides a preparation method of the above-mentioned indoor inorganic mineral coating with flame retardant function, including the following steps:

[0020] S1. Add the silicate to water, continuously stir until completely dissolved to obtain a silicate solution;

[0021] S2. Add the porous SiO 2 tube, emulsifier and water-soluble phenolic resin to the silicate solution obtained in S1, stir until completely fused, and adjust the pH value to 8.5 ± 0.2 to obtain a mixed solution;

[0022] S3. Add calcium carbonate, silicon phosphate, calcium bicarbonate, bentonite and mineral dye to the mixed solution obtained in S2, mix well, and then add pentaerythritol and mix well to obtain a slurry;

[0023] S4. Put the slurry obtained in S3 into a ball mill, stir and grind for 20 - 30 min, and pass through a 150 - mesh sieve to obtain the indoor inorganic mineral coating with flame - retardant function.

[0024] This application has the following beneficial effects:

[0025] 1. The present invention uses water - soluble phenolic resin. The three - dimensional network structure formed during its curing process has high thermal stability and good carbonization ability. This enables it to rapidly form a stable carbonized layer at high temperatures, effectively isolating the exchange of oxygen and combustible gases, thereby preventing the spread of flames; after sodium silicate is dissolved in water, it gradually hardens through the evaporation of water and the action of carbon dioxide to form silicic acid colloid and solid silicon dioxide, which can penetrate into the pores of the porous SiO 2 tubes to form a dense cross - linked structure. This structure has stronger adaptability to the expansion of the substrate, helps to improve the overall strength and adhesion of the coating, and maintains stability in high - temperature environments; at the same time, this dense cross - linked structure rich in silicon dioxide itself has high fire - resistance and high - temperature resistance characteristics, and works synergistically with the water - soluble phenolic resin to synergistically improve the fire - retardant performance of the prepared coating.

[0026] 2. In the preparation of the porous SiO 2 tubes, polyvinylpyrrolidone is modified on the surface of multi - walled carbon nanotubes to uniformly disperse the multi - walled carbon nanotubes in an ethanol - ammonia aqueous solution; ammonia water acts as a catalyst to promote the hydrolysis of tetraethyl orthosilicate; cetyltrimethylammonium bromide is adsorbed and wrapped on the surface of the carbon nanotubes; the silicic acid molecules generated by the hydrolysis of tetraethyl orthosilicate combine with cetyltrimethylammonium bromide and polycondense into silicon dioxide to coat on the surface; high - temperature calcination removes cetyltrimethylammonium bromide to obtain porous SiO 2 tubes, which is beneficial for the film - forming substances in the coating to penetrate and connect inside to form a dense cross - linked structure. Description of the Drawings

[0027] Figure 1 、Comparison trend chart of the adhesion of the coatings prepared in Examples 1 - 5 and Comparative Examples 1 - 8 of the present invention before and after high - temperature treatment;

[0028] Figure 2 、Comparison trend chart of the fire - retardant performance (ultimate fire resistance) of the coatings prepared in Examples 1 - 5 and Comparative Examples 1 - 8 of the present invention. Detailed Embodiments

[0029] The following further elaborates on this application with reference to examples.

[0030] The raw materials of the examples and comparative examples of this application are all ordinary commercially available products unless otherwise specified.

[0031] Example 1: First, prepare porous SiO 2 tubes, the steps are as follows:

[0032] A1. Dissolve 9 g of polyvinylpyrrolidone in ethanol to make a 600 mL solution of polyvinylpyrrolidone in ethanol; disperse 2 g of carbon nanotubes in the 600 mL ethanol solution of polyvinylpyrrolidone, stir at a speed of 150 r / min for 12 h, and perform centrifugal separation to obtain modified carbon nanotubes.

[0033] A2. Disperse 2 g of the modified carbon nanotubes obtained in A1 in 900 mL of ethanol-ammonia aqueous solution, and ultrasonicate for 40 min to obtain a first mixed solution. In the ethanol-ammonia aqueous solution, the molar ratio of NH 3 , ethanol and water is 1:31:255.

[0034] A3. Add 6.2 g of cetyltrimethylammonium bromide to the first mixed solution obtained in A2, ultrasonicate for 20 min first, and then stir at a speed of 180 r / min for 2 h to obtain a second mixed solution.

[0035] A4. Add 11 mL of tetraethyl orthosilicate to the second mixed solution obtained in A3, and stir at 150 r / min for 8 h to obtain a third mixed solution.

[0036] A5. Centrifuge and wash the third mixed solution obtained in A4 three times with 70% ethanol aqueous solution, dry, and calcine in a muffle furnace at 550 °C for 6 h to obtain the porous SiO 2 tubes.

[0037] Among them, polyvinylpyrrolidone (PVP-K30) is purchased from Shandong Qiansheng Chemical Co., Ltd. The carbon nanotubes are multi-walled carbon nanotubes (XT-CNTs) purchased from Shanghai Xiangtian Nanomaterials Co., Ltd. Cetyltrimethylammonium bromide (SY-Q1) is purchased from Shandong Senya New Materials Co., Ltd. Tetraethyl orthosilicate is purchased from Shandong Chuxin Chemical Co., Ltd.

[0038] Then, prepare an indoor inorganic mineral coating with flame retardant function, the steps are as follows:

[0039] S1. By weight, add 14 parts of sodium silicate to 50 parts of water, and continuously stir until completely dissolved to obtain a sodium silicate solution.

[0040] S2. Add 11 parts of porous SiO 2 tubes, 0.8 part of emulsifier sodium lauroyl sarcosinate and 3 parts of water-soluble phenolic resin to the sodium silicate solution obtained in S1, stir until completely fused, and adjust the pH value to about 8.5 to obtain a mixed solution.

[0041] S3. Add 5 parts of calcium carbonate, 6 parts of silicon phosphate, 7 parts of calcium bicarbonate, 3 parts of bentonite, and 2 parts of iron red, a mineral dye, to the mixed solution obtained in S2, mix well, then add 2 parts of pentaerythritol and mix well to obtain a slurry.

[0042] S4. Put the slurry obtained in S3 into a ball mill, stir and grind for 20 - 30 min, and pass through a 150 - mesh sieve to obtain an indoor inorganic mineral coating with flame - retardant function.

[0043] Among them, the water - soluble phenolic resin has the model YHY5211, its solid content is 35 - 37%, its viscosity is 12 - 17 mps, and it is purchased from Aolilong (Jining) Chemical Co., Ltd. Sodium silicate (80 - mesh) is purchased from Jinan Xiangfa Chemical Technology Co., Ltd. Calcium carbonate (20 PPM) is purchased from Jiande Xin'anjiang Yonghe Plastic Factory. Silicon phosphate (100 - mesh) is purchased from Hunan Fengen New Material Technology Co., Ltd. Calcium bicarbonate is purchased from Guangzhou Liuyang Chemical Co., Ltd. Bentonite (first - grade product) is purchased from Lingshou County Aotai Mineral Products Processing Factory. Iron red, a mineral dye (400 - mesh), is purchased from Lingshou County Anhong Mineral Products Processing Factory. The emulsifier sodium lauroyl sarcosinate (LS - 30) is purchased from Guangzhou Pengyuan Chemical Co., Ltd. Pentaerythritol (with a content of 98%) is purchased from Jinan Quanxing New Material Co., Ltd.

[0044] Example 2: The difference between this example and Example 1 is that in A2, the molar ratio of NH 3 , ethanol, and water in the ethanol - ammonia aqueous solution is 1:30:250.

[0045] Example 3: The difference between this example and Example 1 is that in A2, the molar ratio of NH 3 , ethanol, and water in the ethanol - ammonia aqueous solution is 1:32:265.

[0046] Example 4: The difference between this example and Example 1 is that the steps for preparing the indoor inorganic mineral coating with flame - retardant function are as follows:

[0047] S1. By weight, add 10 parts of sodium silicate to 40 parts of water, continuously stir until completely dissolved to obtain a silicate solution.

[0048] S2. Add 8 parts of porous SiO 2 tubes, 0.5 part of the emulsifier sodium lauroyl sarcosinate, and 2 parts of water - soluble phenolic resin to the silicate solution obtained in S1, stir until completely fused, and adjust the pH value to about 8.5 to obtain a mixed solution.

[0049] S3. Add 4 parts of calcium carbonate, 4 parts of silicon phosphate, 6 parts of calcium bicarbonate, 2 parts of bentonite, and 1 part of iron red, a mineral dye, to the mixed solution obtained in S2, mix well, then add 1 part of pentaerythritol and mix well to obtain a slurry.

[0050] S4. Put the slurry obtained in S3 into a ball mill, stir and grind for 20 - 30 min, and pass through a 150 - mesh sieve to obtain the indoor inorganic mineral coating with flame - retardant function.

[0051] Example 5: The difference between this example and Example 1 is that the preparation of the indoor inorganic mineral coating with flame - retardant function is as follows:

[0052] S1. By weight, add 17 parts of sodium silicate to 60 parts of water, and continuously stir until completely dissolved to obtain a sodium silicate solution.

[0053] S2. Add 15 parts of porous SiO 2 tube, 1 part of emulsifier sodium lauroyl sarcosinate and 4 parts of water - soluble phenolic resin to the sodium silicate solution obtained in S1, stir until completely fused, and adjust the pH value to about 8.5 to obtain a mixed solution.

[0054] S3. Add 7 parts of calcium carbonate, 9 parts of silicon phosphate, 9 parts of calcium bicarbonate, 5 parts of bentonite and 3 parts of mineral dye iron red to the mixed solution obtained in S2, mix well, then add 3 parts of pentaerythritol, and mix well to obtain a slurry.

[0055] S4. Put the slurry obtained in S3 into a ball mill, stir and grind for 20 - 30 min, and pass through a 150 - mesh sieve to obtain the indoor inorganic mineral coating with flame - retardant function.

[0056] Comparative Example 1: The difference between this comparative example and Example 1 is that the porous SiO 2 tube is replaced by commercially available silica. This silica (300 - mesh, Zhongbei Weilan) is purchased from Shanghai Kayin Chemical Co., Ltd.

[0057] Specifically, the preparation of the indoor inorganic mineral coating with flame - retardant function is as follows:

[0058] S1. By weight, add 14 parts of sodium silicate to 50 parts of water, and continuously stir until completely dissolved to obtain a sodium silicate solution.

[0059] S2. Add 11 parts of silica, 0.8 part of emulsifier sodium lauroyl sarcosinate and 3 parts of water - soluble phenolic resin to the sodium silicate solution obtained in S1, stir until completely fused, and adjust the pH value to about 8.5 to obtain a mixed solution.

[0060] S3. Add 5 parts of calcium carbonate, 6 parts of silicon phosphate, 7 parts of calcium bicarbonate, 3 parts of bentonite and 2 parts of mineral dye iron red to the mixed solution obtained in S2, mix well, then add 2 parts of pentaerythritol, and mix well to obtain a slurry.

[0061] S4. Put the slurry obtained in S3 into a ball mill, stir and grind for 20 - 30 min, and pass through a 150 - mesh sieve to obtain the indoor inorganic mineral coating with flame - retardant function.

[0062] Comparative Example 2: The difference between this comparative example and Example 1 is that the porous SiO 2 tube was replaced with commercially available multi-walled carbon nanotubes. These multi-walled carbon nanotubes (XT-CNTs) were purchased from Shanghai Xiangtian Nanomaterials Co., Ltd.

[0063] Specifically, to prepare an indoor inorganic mineral coating with flame retardant function, the steps are as follows:

[0064] S1. By weight, add 14 parts of sodium silicate to 50 parts of water, and continuously stir until completely dissolved to obtain a silicate solution.

[0065] S2. Add 11 parts of multi-walled carbon nanotubes, 0.8 part of emulsifier sodium lauroyl sarcosinate, and 3 parts of water-soluble phenolic resin to the silicate solution obtained in S1, stir until completely fused, and adjust the pH value to about 8.5 to obtain a mixed solution.

[0066] S3. Add 5 parts of calcium carbonate, 6 parts of silicon phosphate, 7 parts of calcium bicarbonate, 3 parts of bentonite, and 2 parts of mineral dye iron red to the mixed solution obtained in S2, mix well, then add 2 parts of pentaerythritol, and mix well to obtain a slurry.

[0067] S4. Put the slurry obtained in S3 into a ball mill, stir and grind for 20 - 30 min, and pass through a 150-mesh sieve to obtain an indoor inorganic mineral coating with flame retardant function.

[0068] Comparative Example 3: The difference between this comparative example and Example 1 is that the porous SiO 2 tube was replaced with commercially available multi-walled carbon nanotubes and silicon dioxide, and the mass ratio of the two is 1:1. The silicon dioxide (300 mesh, Zhongbei Weilan) was purchased from Shanghai Kayin Chemical Co., Ltd. The multi-walled carbon nanotubes (XT-CNTs) were purchased from Shanghai Xiangtian Nanomaterials Co., Ltd.

[0069] Specifically, to prepare an indoor inorganic mineral coating with flame retardant function, the steps are as follows:

[0070] S1. By weight, add 14 parts of sodium silicate to 50 parts of water, and continuously stir until completely dissolved to obtain a silicate solution.

[0071] S2. Add 5.5 parts of multi-walled carbon nanotubes, 5.5 parts of silicon dioxide, 0.8 part of emulsifier sodium lauroyl sarcosinate, and 3 parts of water-soluble phenolic resin to the silicate solution obtained in S1, stir until completely fused, and adjust the pH value to about 8.5 to obtain a mixed solution.

[0072] S3. Add 5 parts of calcium carbonate, 6 parts of silicon phosphate, 7 parts of calcium bicarbonate, 3 parts of bentonite, and 2 parts of mineral dye iron red to the mixed solution obtained in S2, mix well, then add 2 parts of pentaerythritol, and mix well to obtain a slurry.

[0073] S4. Put the slurry obtained in S3 into a ball mill, stir and grind for 20 - 30 min, and then pass through a 150 - mesh sieve to obtain the indoor inorganic mineral coating with flame - retardant function.

[0074] Comparative Example 4: The difference between this comparative example and Example 1 is that the porous SiO 2 tube is deleted.

[0075] Specifically, the steps for preparing the indoor inorganic mineral coating with flame - retardant function are as follows:

[0076] S1. By weight, add 14 parts of sodium silicate to 50 parts of water, and continuously stir until completely dissolved to obtain a sodium silicate solution.

[0077] S2. Add 0.8 part of emulsifier sodium lauroyl sarcosinate and 3 parts of water - soluble phenolic resin to the sodium silicate solution obtained in S1, stir until completely fused, and adjust the pH value to about 8.5 to obtain a mixed solution.

[0078] S3. Add 5 parts of calcium carbonate, 6 parts of silicon phosphate, 7 parts of calcium bicarbonate, 3 parts of bentonite and 2 parts of mineral dye iron red to the mixed solution obtained in S2, mix well, then add 2 parts of pentaerythritol, and mix well to obtain a slurry.

[0079] S4. Put the slurry obtained in S3 into a ball mill, stir and grind for 20 - 30 min, and then pass through a 150 - mesh sieve to obtain the indoor inorganic mineral coating with flame - retardant function.

[0080] Comparative Example 5: The difference between this comparative example and Example 1 is that sodium silicate is deleted.

[0081] Specifically, the steps for preparing the indoor inorganic mineral coating with flame - retardant function are as follows:

[0082] S1. Add 11 parts of porous SiO 2 tube, 0.8 part of emulsifier sodium lauroyl sarcosinate and 3 parts of water - soluble phenolic resin to 50 parts of water, stir until completely fused, and adjust the pH value to about 8.5 to obtain a mixed solution.

[0083] S2. Add 5 parts of calcium carbonate, 6 parts of silicon phosphate, 7 parts of calcium bicarbonate, 3 parts of bentonite and 2 parts of mineral dye iron red to the mixed solution obtained in S1, mix well, then add 2 parts of pentaerythritol, and mix well to obtain a slurry.

[0084] S3. Put the slurry obtained in S2 into a ball mill, stir and grind for 20 - 30 min, and then pass through a 150 - mesh sieve to obtain the indoor inorganic mineral coating with flame - retardant function.

[0085] Comparative Example 6: The difference between this comparative example and Example 1 is that the porous SiO 2 tube and sodium silicate are deleted.

[0086] Specifically, the steps for preparing the flame-retardant indoor inorganic mineral coating are as follows:

[0087] S1. Add 0.8 parts of sodium lauroyl sarcosinate as an emulsifier and 3 parts of water-soluble phenolic resin to 50 parts of water, stir until completely fused, and adjust the pH value to about 8.5 to obtain a mixed solution.

[0088] S2. Add 5 parts of calcium carbonate, 6 parts of silicon phosphate, 7 parts of calcium bicarbonate, 3 parts of bentonite, and 2 parts of iron red as a mineral dye to the mixed solution obtained in S1, mix well, then add 2 parts of pentaerythritol and mix well to obtain a slurry.

[0089] S3. Put the slurry obtained in S2 into a ball mill, stir and grind for 20 - 30 minutes, and pass through a 150-mesh sieve to obtain the flame-retardant indoor inorganic mineral coating.

[0090] Comparative Example 7: The difference between this comparative example and Example 1 is that the water-soluble phenolic resin is replaced with a waterborne acrylic resin. This waterborne acrylic resin (content ≥ 40%) is purchased from Guangzhou Changhao Trading Co., Ltd.

[0091] Specifically, the steps for preparing the flame-retardant indoor inorganic mineral coating are as follows:

[0092] S1. By weight, add 14 parts of sodium silicate to 50 parts of water, and continuously stir until completely dissolved to obtain a sodium silicate solution.

[0093] S2. Add 11 parts of porous SiO 2 tube, 0.8 parts of sodium lauroyl sarcosinate as an emulsifier, and 3 parts of waterborne acrylic resin to the sodium silicate solution obtained in S1, stir until completely fused, and adjust the pH value to about 8.5 to obtain a mixed solution.

[0094] S3. Add 5 parts of calcium carbonate, 6 parts of silicon phosphate, 7 parts of calcium bicarbonate, 3 parts of bentonite, and 2 parts of iron red as a mineral dye to the mixed solution obtained in S2, mix well, then add 2 parts of pentaerythritol and mix well to obtain a slurry.

[0095] S4. Put the slurry obtained in S3 into a ball mill, stir and grind for 20 - 30 minutes, and pass through a 150-mesh sieve to obtain the flame-retardant indoor inorganic mineral coating.

[0096] Comparative Example 8: The difference between this comparative example and Example 1 is that the porous SiO 2 tube and sodium silicate are deleted, and the water-soluble phenolic resin is replaced with a waterborne acrylic resin.

[0097] Test Example 1: Test item: Adhesion before and after high-temperature treatment.

[0098] Test objects: Inorganic mineral coatings prepared in Examples 1 - 5 and Comparative Examples 1 - 8.

[0099] Test method and basis: The substrate is a steel plate, the temperature of the high-temperature treatment is 200 °C, and the time is 12 h; Cross-cut method - GB / T 1720-2020.

[0100] Test results: See Table 1.

[0101] Test Example 2: Test item: Flame retardancy performance.

[0102] Test object: The inorganic mineral coatings prepared in Examples 1-5 and Comparative Examples 1-8.

[0103] Test method and basis: The substrate is a wooden board, and the detection is carried out according to the detection method in GB12441-2005 "Decorative fire retardant coatings".

[0104] Test results: See Table 1.

[0105]

[0106] Result analysis: Analyze Examples 1-5 and combine with the data in Table 1 and Figure 1-2 It can be seen that the coatings prepared by the present invention have high adhesion (grade 1), and can still maintain high adhesion (grade 1) at high temperatures, and have excellent fire retardancy performance, with a fire resistance limit of up to more than 113 min.

[0107] Analyze Example 1 and Comparative Examples 1-6 and combine with the data in Table 1 and Figure 1-2 It can be seen that the addition of porous SiO 2 tubes can not only improve the adhesion of the prepared coatings, but also improve the stability of the adhesion at high temperatures; the addition of sodium silicate can also improve the stability of the adhesion at high temperatures to a certain extent; and there is a synergistic effect between the two, which can synergistically improve the stability of the adhesion of the prepared coatings at high temperatures.

[0108] At the same time, the addition of porous SiO 2 tubes and sodium silicate can both improve the fire retardancy performance of the prepared coatings; and the two can work synergistically to synergistically improve the fire retardancy performance of the prepared coatings.

[0109] From the data comparison, we can also summarize and find that for the same coating (coating layer), the better the coating adhesion, the better the stability of the coating adhesion at high temperatures, and the better the fire retardancy performance of the coating layer.

[0110] Analyze Example 1 and Comparative Examples 6-7 and combine with the data in Table 1 and Figure 1-2It can be seen that the water-soluble phenolic resin, which is the raw material component of the coating of the present invention, cannot be easily replaced by other resins (waterborne acrylic resin), otherwise it will lead to a decrease in the stability of the adhesion of the coating at high temperature, resulting in a decrease in the adhesion of the coating in a high-temperature environment, and will also lead to a decrease in the fireproof and flame-retardant performance of the coating; moreover, there is also a certain synergistic effect between the water-soluble phenolic resin and the porous SiO 2 tube and sodium silicate, which can synergistically improve the fireproof and flame-retardant performance of the prepared coating.

[0111] In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0112] In addition, any combination can be made between various different embodiments of the present invention, as long as it does not violate the idea of the present invention, it should also be regarded as the content disclosed by the present invention.

Claims

1. An indoor inorganic mineral paint with flame retardant function, characterized in that: The composition comprises the following components by weight: 10-17 parts of silicate, 8-15 parts of porous SiO2 tubes, 4-7 parts of calcium carbonate, 0.5-1 parts of emulsifier, 4-9 parts of silicon phosphate, 6-9 parts of calcium bicarbonate, 2-5 parts of bentonite, 2-4 parts of water-soluble phenolic resin, 1-3 parts of pentaerythritol, 1-3 parts of mineral dye and 40-60 parts of water; The preparation method of the porous SiO2 tube is as follows: A1. Disperse 2 g of carbon nanotubes in 600 mL of polyvinyl pyrrolidone ethanol solution, stir for 12 h, and centrifuge to obtain modified carbon nanotubes; A2, dispersing 2 g of the modified carbon nanotubes obtained in A1 in 900 mL of ethanol-ammonia aqueous solution, and ultrasonicating for 40 min to obtain a mixed solution 1; A3, add 6.2 g of hexadecyltrimethylammonium bromide to the mixed solution 1 obtained in A2, ultrasonicate for 20 min, stir for 2 h, and obtain mixed solution 2; A4, add 11 mL of ethyl orthosilicate to the mixed solution 2 obtained in A3, stir for 8 h, and obtain mixed solution 3; A5. The mixed solution obtained in A4 is centrifuged and washed three times with an ethanol solution, dried, and calcined in a muffle furnace at 550° C. for 6 h to obtain the porous SiO2 tube.

2. The flame retardant indoor inorganic mineral paint according to claim 1, characterized in that: The model of the water-soluble phenolic resin is YHY5211, the solid content thereof is 35-37%, and the viscosity thereof is 12-17 mps.

3. The flame retardant indoor inorganic mineral paint according to claim 1, characterized in that: In A1, 1.5 g of polyvinyl pyrrolidone is contained in each 100 mL of the polyvinyl pyrrolidone ethanol solution.

4. The flame retardant indoor inorganic mineral paint according to claim 1, characterized in that: In A2, the molar ratio of NH3, ethanol and water in the ethanol-ammonia solution is 1:(30-32):(250-265).

5. The flame retardant indoor inorganic mineral paint according to claim 1, characterized in that: The silicate includes sodium silicate and / or potassium silicate.

6. The flame retardant indoor inorganic mineral paint according to claim 1, characterized in that: The mineral dye includes any one of iron red, iron yellow, iron black, ultramarine blue and copper green.

7. The flame retardant indoor inorganic mineral paint according to claim 1, characterized in that: The emulsifier includes any one of lauryl aminopropionic acid, cocoyl glutamic acid, and sodium lauroyl sarcosinate.

8. A method for preparing the flame retardant indoor inorganic mineral paint according to any one of claims 1 to 7, characterized in that: The steps include: S1. Add silicate into water and continue stirring until it is completely dissolved to obtain a silicate solution; S2, adding the porous SiO2 tube, emulsifier and water-soluble phenolic resin to the silicate solution obtained in S1, stirring until completely blended, and adjusting the pH value to 8.5±0.2 to obtain a mixed solution; S3, adding calcium carbonate, silicon phosphate, calcium bicarbonate, bentonite and mineral dye to the mixed solution obtained in S2, mixing well, and then adding pentaerythritol, mixing well to obtain a slurry; S4. Put the slurry obtained in S3 into a ball mill, stir and grind for 20-30 minutes, and pass it through a 150-mesh sieve to obtain the indoor inorganic mineral paint with flame retardant function.

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