Water-based flame-retardant coating as well as preparation method and application thereof

Abstract

The invention relates to the technical field of water-based building coatings. The water-based flame-retardant coating is prepared from the following raw materials in parts by weight: 40 to 50 parts of water-based polyurethane resin, 20 to 30 parts of deionized water, 2 to 4 parts of trimethylbenzene, 8 to 10 parts of dipropylene glycol monomethyl ether, 8 to 12 parts of a functional aid, 5 to 8 parts of a stabilizer, 4 to 6 parts of a regulator, 1.2 to 1.8 parts of an active agent, 0.3 to 0.6 part of a diluent and 0.2 to 0.3 part of a flatting agent. According to the invention, the functional additive is prepared from modified cardanol and is added, the thermal stability and flame retardant property of cardanol are effectively utilized, after the coating is smeared, dried and molded, the thermal decomposition mode of the coating can be changed, the generation of combustible substances in the high-temperature state of the coating is reduced, and meanwhile, when the coating encounters flame, the flame retardant property of the coating is improved. The functional additive can generate a carbon layer in the combustion process, so that the flame-retardant and oxygen-isolating effects are achieved, and the flame-retardant property of the coating is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of water-based architectural coatings, and in particular to a water-based flame-retardant coating and a preparation method and application thereof. Background Art

[0002] Water-based architectural paint is a kind of architectural paint that uses water as the main solvent or dispersion medium. Compared with traditional solvent-based paint, it has significant environmental advantages. Water-based paint is relatively thin, easy to color, and less likely to clump, so it is easy to control the thickness of the paint and make the coating fully compacted. Water-based architectural paint is widely used in the field of building decoration, including indoor and outdoor walls, doors and windows, wood products, metal products, glass and other surface coatings. At the same time, it is also suitable for industrial coating fields, such as floor coatings.

[0003] In the prior art, the flame retardant performance of water-based architectural coatings is relatively poor, and they are easy to burn in the event of a fire, which affects safety. Based on this, the present invention provides a water-based flame retardant coating and a preparation method and application thereof. Summary of the invention

[0004] The purpose of the present invention is to provide a water-based flame-retardant coating and a preparation method and application thereof. The water-based coating prepared by the present invention not only has good flame retardant properties, but also has excellent heat insulation properties, providing a guarantee for safety.

[0005] To achieve the above object, the present invention provides the following technical solutions: A water-based flame-retardant coating is composed of the following raw materials in parts by weight: 40-50 parts of water-based polyurethane resin, 20-30 parts of deionized water, 2-4 parts of trimethylbenzene, 8-10 parts of dipropylene glycol methyl ether, 8-12 parts of functional additives, 5-8 parts of stabilizers, 4-6 parts of regulators, 1.2-1.8 parts of active agents, 0.3-0.6 parts of diluents and 0.2-0.3 parts of leveling agents.

[0006] Preferably, the preparation method of the functional additive comprises the following steps: Step 1, add the modified cardanol and maleic anhydride mixed solution into a three-necked bottle at a dosage ratio of 0.04-0.06 g / ml, stir and swell for 1-1.5 h, dissolve resorcinol in catechol violet solvent at a solid-liquid ratio of 0.2-0.3 g / ml and add to the three-necked bottle, then mix in a water bath at 80-90° C. for 30-40 min, cool the reaction solution, filter and obtain a first mixed solution, and store the first mixed solution for standby use; Step 2: Add propylene glycol to the first mixed solution at a mass ratio of 1:1.3-1.4 to obtain a second mixed solution, add butyl acetate in an amount of 5-6 times the mass of propylene glycol to the second mixed solution, mix and stir to obtain a diluent, add 3% to 5% of dibenzoyl peroxide by mass to the diluent, stir and mix to obtain an impregnation solution, adjust the pH of the impregnation solution to neutral, and obtain a functional additive.

[0007] Preferably, the preparation method of the modified cardanol is as follows: cardanol and zinc acetate are mixed at a solid-liquid ratio of 0.05-0.08 g / ml and added to a beaker, and the mixture is water-bathed at 75-85° C. for 10-15 minutes. After the water-bath is completed, a formaldehyde solution accounting for 50-60% of the mass of the product obtained in the water-bath is added, and the mixture is placed in a centrifuge after standing for 10-15 minutes. The centrifuge is set to 5000-6000 r / min and continuously operates for 2-3 minutes. After centrifugation, the cardanol phenolic resin is obtained, and the cardanol phenolic resin is mixed with epichlorohydrin in a mass ratio of 1:2-2.2. After mixing, the mixture is water-bathed at 70-80° C. for 1-1.3 hours. During the water-bath process, a sodium hydroxide solution accounting for 10-15% of the mass of the cardanol phenolic resin is added dropwise every 10-15 minutes. After the reaction in a water bath, the mixture is cooled to obtain the modified cardanol.

[0008] Preferably, the preparation method of the stabilizer is: adding titanium dioxide with a mass ratio of 1:4-6 to a diluent, putting it into a mixing device and stirring it at a low speed to obtain a pre-diluent, pouring the pre-diluent into the mixing device and stirring it at a low speed for 10-12 minutes, filtering with a 200-mesh filter cloth after stirring, and completing the discharge after filtering to obtain the stabilizer.

[0009] Preferably, the regulator is selected from one or more combinations of butoxyethanol, ethylene glycol monobutyl ether, and ethylene glycol, and the activator is selected from any one of sulfonate, sodium dodecyl sulfonate, and sodium trifluoromethanesulfonate.

[0010] Preferably, the diluent is any one of acrylic paint, furan acrylic acid, and isopropyl acrylate, and the leveling agent is any one of polyether-modified silicone and silicone resin.

[0011] Preferably, the aqueous polyurethane resin and deionized water are pre-mixed before preparation, and after mixing, poured into a mixing device and stirred at high speed for 4-6 minutes to obtain a mixed solution.

[0012] Preferably, the trimethylbenzene and dipropylene glycol methyl ether are pre-mixed and added into an internal mixer before preparation, and the internal mixer is heat-kneaded for 1-1.5 hours at a temperature of 160-180° C., and the additive is obtained after the kneading is completed.

[0013] Furthermore, a method for preparing a water-based flame-retardant coating comprises the following steps: weighing a prepared mixed liquid, additives and other prepared raw materials as required, and then putting each raw material into a mixing device for stirring at a stirring speed of 600-800rpm for 40-50min, and after stirring evenly, a water-based flame-retardant coating is obtained.

[0014] Further, an application of a water-based flame retardant coating, wherein the water-based flame retardant coating is used at 400g / m 2 Apply evenly on the building surface.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention prepares a functional additive by modifying cardanol for addition, which effectively utilizes the thermal stability and flame retardant properties of cardanol. After the coating is applied, dried and formed, the thermal decomposition mode of the coating can be changed, and the generation of combustible substances in the coating at high temperatures can be reduced. At the same time, when the coating encounters a flame, the functional additive can generate a carbon layer during the combustion process, which has a flame retardant and oxygen isolation effect, and further improves the flame retardant properties of the coating.

[0016] 2. The present invention prepares water-based paint by adding a stabilizer made of titanium dioxide. The diluted solution formed after the titanium dioxide is treated can be evenly mixed in the paint. After the coating is completed, the hiding power and reflective properties of the titanium dioxide can form a heat-insulating coating on the surface of the paint, thereby effectively improving the heat-insulating performance of the paint. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] Example 1 A water-based flame-retardant coating is composed of the following raw materials in parts by weight: 40 parts of water-based polyurethane resin, 20 parts of deionized water, 2 parts of trimethylbenzene, 8 parts of dipropylene glycol methyl ether, 8 parts of functional additives, 5 parts of stabilizers, 4 parts of regulators, 1.2 parts of active agents, 0.3 parts of diluents and 0.2 parts of leveling agents.

[0019] First, the preparation method of the functional additive comprises the following steps: Step 1: Add the modified cardanol and maleic anhydride mixed solution into a three-necked bottle at a dosage ratio of 0.04 g / ml, stir and swell for 1 h, dissolve resorcinol in catechol violet solvent at a solid-liquid ratio of 0.2 g / ml and add to the three-necked bottle, then mix in a water bath at 80° C. for 30 min, and cool and filter the obtained reaction solution to obtain a first mixed solution, which is stored for standby use; Step 2: Add propylene glycol to the first mixed solution at a mass ratio of 1:1.3 to obtain a second mixed solution, add butyl acetate in an amount 5 times the mass of propylene glycol to the second mixed solution, mix and stir to obtain a diluent, add 3% of dibenzoyl peroxide by mass to the diluent, and stir and mix to obtain an impregnation solution, adjust the pH of the impregnation solution to neutral, and obtain a functional additive.

[0020] Among them, the preparation method of modified cardanol is as follows: cardanol and zinc acetate are mixed at a solid-liquid ratio of 0.05g / ml and added to a beaker, and the mixture is water-bathed at 75°C for 10 minutes. After the water-bath is completed, a formaldehyde solution accounting for 50% of the mass of the product obtained in the water-bath is added, and the mixture is placed in a centrifuge after standing for 10 minutes. The centrifuge is set to 5000r / min and continuously operates for 2 minutes. After centrifugation, cardanol phenolic resin is obtained, and the cardanol phenolic resin is mixed with epichlorohydrin in a mass ratio of 1:2. After mixing, the mixture is water-bathed at 70°C for 1 hour. During the water-bath process, a sodium hydroxide solution accounting for 10% of the mass of the cardanol phenolic resin is added dropwise every 10 minutes. After the reaction in a water bath, the mixture is cooled to obtain modified cardanol.

[0021] Furthermore, the preparation method of the stabilizer is: adding titanium dioxide with a mass ratio of 1:4 to the diluent, putting it into a mixing equipment and stirring it at a low speed to obtain a pre-diluent, pouring the pre-diluent into the mixing equipment and stirring it at a low speed for 10 minutes, filtering with a 200-mesh filter cloth after stirring, and completing the discharge after filtration to obtain the stabilizer.

[0022] Furthermore, the regulator is a mixture of butoxyethanol and ethylene glycol monobutyl ether, and the activator is sulfonate.

[0023] Furthermore, the diluent is acrylic paint, and the leveling agent is polyether modified silicone.

[0024] Furthermore, the waterborne polyurethane resin and deionized water are pre-mixed before preparation, and after mixing, poured into a mixing device and stirred at high speed for 4 minutes to obtain a mixed solution.

[0025] Furthermore, trimethylbenzene and dipropylene glycol methyl ether are pre-mixed before preparation and added into an internal mixer, and the internal mixer is heat-kneaded for 1 hour at a temperature of 160° C., and the additive is obtained after the kneading is completed.

[0026] The present embodiment also provides a method for preparing a water-based flame-retardant coating, comprising the following steps: weighing a mixed liquid, additives and other raw materials as needed, and then putting each raw material into a mixing device for stirring at a stirring speed of 600 rpm for 40 minutes. After stirring evenly, a water-based flame-retardant coating is obtained.

[0027] This embodiment also provides an application of a water-based flame retardant coating. The water-based flame retardant coating is used at a pressure of 400 g / m 2 Apply evenly on the building surface.

[0028] Example 2 The preparation method of the water-based flame retardant coating in this embodiment is basically the same as that in Example 1, except that the specific ratios of the raw materials used and the preparation methods of the functional additives used in the two are different. The specific ratios of the raw materials used to prepare the water-based flame retardant coating in this embodiment and the preparation methods of the functional additives are as follows: A water-based flame-retardant coating is composed of the following raw materials in parts by weight: 45 parts of water-based polyurethane resin, 25 parts of deionized water, 3 parts of trimethylbenzene, 9 parts of dipropylene glycol methyl ether, 10 parts of functional additives, 7 parts of stabilizers, 5 parts of regulators, 1.5 parts of active agents, 0.4 parts of diluents and 0.25 parts of leveling agents.

[0029] First, the preparation method of the functional additive comprises the following steps: Step 1: Add the modified cardanol and maleic anhydride mixed solution into a three-necked bottle at a dosage ratio of 0.05 g / ml, stir and swell for 1.2 hours, dissolve resorcinol in catechol violet solvent at a solid-liquid ratio of 0.25 g / ml and add to the three-necked bottle, then mix in a water bath at 85° C. for 35 minutes, and cool and filter the obtained reaction solution to obtain a first mixed solution, which is stored for standby use; Step 2: Add propylene glycol to the first mixed solution at a mass ratio of 1:1.35 to obtain a second mixed solution, add butyl acetate in an amount 5.5 times the mass of propylene glycol to the second mixed solution, mix and stir to obtain a diluent, add 4% of dibenzoyl peroxide by mass to the diluent, and stir and mix to obtain an impregnation solution, adjust the pH of the impregnation solution to neutral, and obtain a functional additive.

[0030] Among them, the preparation method of modified cardanol is as follows: cardanol and zinc acetate are mixed at a solid-liquid ratio of 0.06g / ml and added to a beaker, and water bathed at 80°C for 13 minutes. After the water bath is completed, a formaldehyde solution accounting for 55% of the mass of the product obtained in the water bath is added, and the mixture is placed in a centrifuge after standing for 13 minutes. The centrifuge is set to 5500r / min and continuously operates for 2.5 minutes. After centrifugation, cardanol phenolic resin is obtained, and the cardanol phenolic resin is mixed with epichlorohydrin in a mass ratio of 1:2.1. After mixing, it is water bathed at 75°C for 1.1 hours. During the water bath process, a sodium hydroxide solution accounting for 12% of the mass of the cardanol phenolic resin is added dropwise every 12 minutes. After the reaction in a water bath, it is cooled to obtain modified cardanol.

[0031] Furthermore, the preparation method of the stabilizer is: adding titanium dioxide with a mass ratio of 1:5 to the diluent, putting it into a mixing equipment and stirring it at a low speed to obtain a pre-diluent, pouring the pre-diluent into the mixing equipment and stirring it at a low speed for 11 minutes, filtering with a 200-mesh filter cloth after stirring, and completing the discharge after filtration to obtain the stabilizer.

[0032] Furthermore, the regulator is a mixture of ethylene glycol monobutyl ether and ethylene glycol, and the activator is sodium dodecyl sulfonate.

[0033] Furthermore, the diluent is furan acrylic acid, and the leveling agent is silicone resin.

[0034] Furthermore, the waterborne polyurethane resin and deionized water are pre-mixed before preparation, and after mixing, poured into a mixing device and stirred at high speed for 5 minutes to obtain a mixed solution.

[0035] Furthermore, trimethylbenzene and dipropylene glycol methyl ether were pre-mixed before preparation and added into an internal mixer, and the internal mixer was heat-kneaded for 1.2 hours at a temperature of 170° C., and the additive was obtained after the kneading was completed.

[0036] The present embodiment also provides a method for preparing a water-based flame-retardant coating, comprising the following steps: weighing a mixed liquid, additives and other raw materials as needed, and then putting each raw material into a mixing device for stirring at a stirring speed of 700 rpm for 45 minutes. After stirring evenly, a water-based flame-retardant coating is obtained.

[0037] This embodiment also provides an application of a water-based flame retardant coating. The water-based flame retardant coating is used at a pressure of 400 g / m 2 Apply evenly on the building surface.

[0038] Example 3 The preparation method of the water-based flame retardant coating in this embodiment is basically the same as that in Example 1, except that the specific ratios of the raw materials used and the preparation methods of the functional additives used in the two are different. The specific ratios of the raw materials used to prepare the water-based flame retardant coating in this embodiment and the preparation methods of the functional additives are as follows: A water-based flame-retardant coating is composed of the following raw materials in parts by weight: 50 parts of water-based polyurethane resin, 30 parts of deionized water, 4 parts of trimethylbenzene, 10 parts of dipropylene glycol methyl ether, 12 parts of functional additives, 8 parts of stabilizers, 6 parts of regulators, 1.8 parts of active agents, 0.6 parts of diluents and 0.3 parts of leveling agents.

[0039] First, the preparation method of the functional additive comprises the following steps: Step 1: Add the modified cardanol and maleic anhydride mixed solution into a three-necked bottle at a dosage ratio of 0.06 g / ml, stir and swell for 1.5 h, dissolve resorcinol in catechol violet solvent at a solid-liquid ratio of 0.3 g / ml and add to the three-necked bottle, then mix in a water bath at 90° C. for 40 min, and cool and filter the obtained reaction solution to obtain a first mixed solution, which is stored for standby use; Step 2: Add propylene glycol to the first mixed solution at a mass ratio of 1:1.4 to obtain a second mixed solution, add butyl acetate in an amount of 6 times the mass of propylene glycol to the second mixed solution, mix and stir to obtain a diluent, add benzoyl peroxide in an amount of 5% by mass of the diluent to the diluent, and stir and mix to obtain an impregnation solution, adjust the pH of the impregnation solution to neutral, and obtain a functional additive.

[0040] Among them, the preparation method of modified cardanol is as follows: cardanol and zinc acetate are mixed at a solid-liquid ratio of 0.08g / ml and added to a beaker, and water bathed at 85°C for 15 minutes. After the water bath is completed, a formaldehyde solution accounting for 60% of the mass of the product obtained in the water bath is added, and the mixture is placed in a centrifuge after standing for 15 minutes. The centrifuge is set to 6000r / min and continuously operates for 3 minutes. After centrifugation, cardanol phenolic resin is obtained, and the cardanol phenolic resin is mixed with epichlorohydrin in a mass ratio of 1:2.2. After mixing, the mixture is water bathed at 80°C for 1.3 hours. During the water bath process, a sodium hydroxide solution accounting for 15% of the mass of the cardanol phenolic resin is added dropwise every 15 minutes. After reaction in a water bath, the mixture is cooled to obtain modified cardanol.

[0041] Furthermore, the preparation method of the stabilizer is: adding titanium dioxide with a mass ratio of 1:6 to the diluent, putting it into a mixing equipment and stirring it at a low speed to obtain a pre-diluent, pouring the pre-diluent into the mixing equipment and stirring it at a low speed for 12 minutes, filtering with a 200-mesh filter cloth after stirring, and completing the discharge after filtration to obtain the stabilizer.

[0042] Furthermore, the regulator is ethylene glycol, and the activator is sodium trifluoromethanesulfonate.

[0043] Furthermore, the diluent is isopropyl acrylate, and the leveling agent is polyether modified silicone.

[0044] Furthermore, the waterborne polyurethane resin and deionized water are pre-mixed before preparation, and after mixing, poured into a mixing device and stirred at high speed for 5 minutes to obtain a mixed solution.

[0045] Furthermore, trimethylbenzene and dipropylene glycol methyl ether are pre-mixed before preparation and added into an internal mixer, and the internal mixer is heat-kneaded for 1.5 hours at a temperature of 180° C., and the additive is obtained after the kneading is completed.

[0046] The present embodiment also provides a method for preparing a water-based flame-retardant coating, comprising the following steps: weighing a mixed liquid, additives and other raw materials as needed, and then putting each raw material into a mixing device for stirring at a stirring speed of 800 rpm for 50 minutes. After stirring evenly, a water-based flame-retardant coating is obtained.

[0047] This embodiment also provides an application of a water-based flame retardant coating. The water-based flame retardant coating is used at a pressure of 400 g / m 2 Apply evenly on the building surface.

[0048] Comparative Example 1: The difference between this embodiment and Example 1 is that this embodiment uses an equal amount of cardanol to replace the functional auxiliary agent.

[0049] Comparative Example 2: The difference between this embodiment and embodiment 1 is that this embodiment uses an equal amount of titanium dioxide to replace the stabilizer.

[0050] Comparative Example 3: The difference between this example and Example 1 is that epichlorohydrin is not mixed in the preparation of the functional additive in this example.

[0051] Comparative Example 4: The difference between this embodiment and embodiment 1 is that this embodiment does not contain a functional auxiliary agent.

[0052] Performance test: The relevant properties of the water-based coating samples provided in Examples 1-3 and Comparative Examples 1-4 were tested respectively, and the obtained test data were recorded in the following table:

[0053] By comparing and analyzing the relevant data in the table, it can be seen that the water-based architectural coating prepared by the present invention not only has good flame retardant properties, but also has excellent thermal insulation properties. This shows that the water-based flame retardant coating provided by the present invention and its preparation method and application have broader market prospects and are more suitable for promotion.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0055] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A water-based flame retardant coating, characterized in that: The method is composed of the following raw materials in parts by weight: 40-50 parts of waterborne polyurethane resin, 20-30 parts of deionized water, 2-4 parts of trimethylbenzene, 8-10 parts of dipropylene glycol methyl ether, 8-12 parts of functional additives, 5-8 parts of stabilizers, 4-6 parts of regulators, 1.2-1.8 parts of active agents, 0.3-0.6 parts of diluents and 0.2-0.3 parts of leveling agents; The preparation method of the functional additive comprises the following steps: Step 1, add the modified cardanol and maleic anhydride mixed solution into a three-necked bottle at a dosage ratio of 0.04-0.06 g / ml, stir and swell for 1-1.5 h, dissolve resorcinol in catechol violet solvent at a solid-liquid ratio of 0.2-0.3 g / ml and add to the three-necked bottle, then mix in a water bath at 80-90° C. for 30-40 min, cool the reaction solution, filter and obtain a first mixed solution, and store the first mixed solution for standby use; Step 2: Add propylene glycol to the first mixed solution at a mass ratio of 1:1.3-1.4 to obtain a second mixed solution, add butyl acetate in an amount of 5-6 times the mass of propylene glycol to the second mixed solution, mix and stir to obtain a diluent, add 3% to 5% of dibenzoyl peroxide by mass to the diluent, stir and mix to obtain an impregnation solution, adjust the pH of the impregnation solution to neutral, and obtain a functional additive.

2. A water-based flame-retardant coating according to claim 1, characterized in that: The preparation method of the modified cardanol is as follows: cardanol and zinc acetate are mixed at a solid-liquid ratio of 0.05-0.08 g / ml and added to a beaker, and the mixture is water-bathed at 75-85° C. for 10-15 minutes, and after the water-bath is completed, a formaldehyde solution accounting for 50-60% of the mass of the product obtained in the water-bath is added, and the mixture is placed in a centrifuge after standing for 10-15 minutes, and the centrifuge is set to 5000-6000 r / min and continuously operated for 2-3 minutes, and cardanol phenolic resin is obtained after centrifugal treatment, and the cardanol phenolic resin is mixed with epichlorohydrin in a mass ratio of 1:2-2.2, and after mixing, the mixture is water-bathed at 70-80° C. for 1-1.3 hours, and a sodium hydroxide solution accounting for 10-15% of the mass of the cardanol phenolic resin is added dropwise every 10-15 minutes during the water-bath process, and the mixture is cooled after a water-bath reaction to obtain the modified cardanol.

3. The water-based flame-retardant coating according to claim 1, characterized in that: The preparation method of the stabilizer is as follows: adding titanium dioxide with a mass ratio of 1:4-6 to a diluent, putting it into a mixing device and stirring it at a low speed to obtain a pre-diluent, pouring the pre-diluent into the mixing device and stirring it at a low speed for 10-12 minutes, filtering with a 200-mesh filter cloth after the stirring is completed, and discharging after filtering to obtain the stabilizer.

4. The water-based flame-retardant coating according to claim 1, characterized in that: The regulator is selected from one or more combinations of butoxyethanol, ethylene glycol monobutyl ether, and ethylene glycol, and the activator is selected from any one of sulfonate, sodium dodecyl sulfonate, and sodium trifluoromethanesulfonate.

5. The water-based flame-retardant coating according to claim 1, characterized in that: The diluent is selected from any one of acrylic paint, furan acrylic acid, and isopropyl acrylate, and the leveling agent is selected from any one of polyether modified silicone and silicone resin.

6. The water-based flame-retardant coating according to claim 1, characterized in that: The waterborne polyurethane resin and deionized water are pre-mixed before preparation, and after mixing, poured into a mixing device and stirred at high speed for 4-6 minutes to obtain a mixed solution.

7. The water-based flame-retardant coating according to claim 1, characterized in that: The trimethylbenzene and dipropylene glycol methyl ether are pre-mixed and added into an internal mixer before preparation. The internal mixer is heat-kneaded for 1-1.5 hours at a temperature of 160-180° C., and the additive is obtained after the kneading is completed.

8. A method for preparing a water-based flame-retardant coating according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: weighing the prepared mixed liquid, additives and other prepared raw materials as required, and then putting the raw materials into a mixing device for stirring at a stirring speed of 600-800 rpm for 40-50 minutes, and after stirring evenly, obtaining a water-based flame retardant coating.

9. Use of the water-based flame-retardant coating prepared by the method for preparing a water-based flame-retardant coating according to claim 8, characterized in that: The water-based flame retardant coating is used at 400g / m 2 Apply evenly on the building surface.

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