A water-based fire-retardant coating, a preparation method and application thereof

Abstract

The present application relates to the technical field of water-based architectural coatings, in particular to a water-based flame-retardant coating, a preparation method and application thereof, which 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 additive, 5-8 parts of stabilizer, 4-6 parts of regulator, 1.2-1.8 parts of active agent, 0.3-0.6 parts of diluent and 0.2-0.3 parts of leveling agent; the functional additive is prepared by modifying cardanol and added, which effectively utilizes the thermal stability and flame-retardant property of cardanol, changes the thermal decomposition mode of the coating after the coating is applied, dried and formed, reduces the production of combustible substances in the high-temperature state of the coating, and the functional additive can generate a carbon layer in the combustion process when the coating encounters flame, which has the effect of flame-retardant and oxygen isolation, further improving the flame-retardant property of the coating.

Description

TECHNICAL FIELD

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

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

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

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

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A water-based flame-retardant coating is composed of the following raw materials 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 adjusting agents, 1.2-1.8 parts of active agents, 0.3-0.6 parts of diluents and 0.2-0.3 parts of leveling agents.

[0007] Preferably, the preparation method of the functional additive comprises the following steps:

[0008] Step one, the modified cardanol and maleic anhydride mixed solution is added to a three-necked bottle at a dosage of 0.04-0.06 g / ml, and stirred and swelled for 1-1.5 h. The resorcinol is dissolved in the catechol violet dissolving agent at a solid-liquid ratio of 0.2-0.3 g / ml, and then added to the three-necked bottle. Then, the mixture is mixed in a water bath at 80-90℃ for 30-40 min. The obtained reaction solution is cooled and filtered to obtain a first mixed solution, which is stored and used.

[0009] Step two, the first mixed solution is mixed with propylene glycol in a mass ratio of 1:1.3-1.4 to obtain a second mixed solution, butyl acetate is added to the second mixed solution in a mass ratio of 5-6 times the mass of the propylene glycol, and after mixing and stirring, a diluent is obtained, then peroxide is added to the diluent in a mass ratio of 3%-5% of the mass of the diluent, and after stirring and mixing, an impregnating solution is obtained, the pH of the impregnating solution is adjusted to neutral, and the functional additive is obtained.

[0010] Preferably, the preparation method of the modified cardanol is as follows: cardanol and zinc acetate are mixed and added to a beaker in a solid-liquid ratio of 0.05-0.08 g / ml, and then water bathed at 75-85℃ for 10-15 min; after water bath, a formaldehyde solution is added to the obtained product in a mass ratio of 50-60% of the mass of the product, and then placed in a centrifuge after standing for 10-15 min, with the centrifuge set to 5000-6000 r / min for continuous operation for 2-3 min; after centrifugal treatment, a cardanol phenol-formaldehyde resin is obtained, and then the cardanol phenol-formaldehyde resin is mixed with epichlorohydrin in a mass ratio of 1:2-2.2, and then water bathed at 70-80℃ for 1-1.3 h, while adding a sodium hydroxide solution to the cardanol phenol-formaldehyde resin in a mass ratio of 10-15% of the mass of the cardanol phenol-formaldehyde resin every 10-15 min during the water bath process; after water bath reaction and cooling, the modified cardanol is obtained.

[0011] Preferably, the preparation method of the stabilizer is as follows: titanium white powder is added to a diluent in a mass ratio of 1:4-6, and then uniformly stirred in a mixing device at a low speed to obtain a pre-diluent; the pre-diluent is poured into the mixing device and stirred at a low speed for 10-12 min, and then filtered through a 200-mesh filter cloth after stirring is completed, and then discharged after filtration, to obtain the stabilizer.

[0012] Preferably, the adjusting agent is selected from one or a combination of butoxy ethanol, ethylene glycol monobutyl ether, and ethylene glycol, and the active agent is selected from any one of sulfonate, sodium dodecyl sulfonate, and sodium triflate.

[0013] Preferably, 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.

[0014] Preferably, the water-based polyurethane resin and deionized water are pre-mixed before preparation, and then poured into a mixing device for high-speed stirring for 4-6 min to obtain a mixed solution.

[0015] Preferably, the trimethylbenzene and dipropylene glycol methyl ether are pre-mixed and added to an internal mixer before preparation, and then mixed and kneaded in the internal mixer for 1-1.5 h at a temperature of 160-180℃, and then the additive is obtained after mixing and kneading is completed.

[0016] Further, a preparation method of the water-based fire-retardant paint comprises the following steps: weighing the preparation mixture, the additive and other preparation raw materials as required, and then putting the raw materials into a mixing device for stirring, the stirring speed is 600-800 rpm, the time is 40-50 min, and the water-based fire-retardant paint is prepared after uniform stirring.

[0017] Further, the water-based fire-retardant paint is applied to the building surface in a uniform coating of 400 g / m 2 .

[0018] Compared with the prior art, the water-based fire-retardant paint has the following beneficial effects:

[0019] 1. The functional additive prepared by modifying cardanol is added, the thermal stability and fire-retardant performance of cardanol are effectively utilized, the thermal decomposition mode of the paint is changed after the paint is coated, dried and formed, the generation of flammable substances of the paint at high temperature is reduced, the functional additive can generate a carbon layer in the combustion process when the paint meets the flame, the fire-retardant and oxygen isolation effects are achieved, and the fire-retardant performance of the paint is further improved.

[0020] 2. The water-based paint is prepared by adding the stabilizer prepared from titanium white powder, the diluent prepared from the treated titanium white powder can be uniformly mixed in the paint, the heat insulation coating is formed on the surface of the paint by using the hiding power and reflection performance of the titanium white powder after coating, and the heat insulation performance of the paint is effectively improved. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0022] Embodiment 1

[0023] The water-based fire-retardant paint 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 additive, 5 parts of stabilizer, 4 parts of regulator, 1.2 parts of active agent, 0.3 parts of diluent and 0.2 parts of leveling agent.

[0024] Firstly, the preparation method of the functional additive comprises the following steps:

[0025] Step one, the modified cardanol and maleic anhydride mixed solution is added to the three-necked flask at a dosage ratio of 0.04 g / ml, and stirred for 1 h, then the resorcinol is dissolved in the catechol violet dissolving agent at a solid-liquid ratio of 0.2 g / ml, and then added to the three-necked flask, and then mixed in a water bath at 80℃ for 30 min, the obtained reaction solution is cooled, filtered and treated to obtain a first mixed solution, and the obtained first mixed solution is stored and used.

[0026] Step two, the first mixed solution is mixed with propylene glycol at a mass ratio of 1:1.3 to obtain a second mixed solution, butyl acetate is added to the second mixed solution at a mass ratio of 5 times the propylene glycol, and then stirred to obtain a dilution solution, then peroxide is added to the dilution solution at a mass ratio of 3% of the dilution solution, and then stirred to obtain an impregnation solution, then the pH of the impregnation solution is adjusted to neutral, and the obtained is the functional aid.

[0027] The preparation method of the modified cardanol is as follows: cardanol and zinc acetate are mixed and added to a beaker at a solid-liquid ratio of 0.05 g / ml, and then water bathed at 75℃ for 10 min, then the obtained product is added to the beaker at a mass ratio of 50% of the formaldehyde solution, then placed in a centrifuge, the centrifuge is set to 5000 r / min for continuous operation for 2 min, then the obtained cardanol phenol formaldehyde resin is obtained after centrifugal treatment, then the cardanol phenol formaldehyde resin is mixed with epichlorohydrin at a mass ratio of 1:2, then mixed and water bathed at 70℃ for 1 h, then sodium hydroxide solution is added dropwise every 10 min during the water bath process, and then cooled after the water bath reaction to obtain the modified cardanol.

[0028] Further, the preparation method of the stabilizer is as follows: titanium white powder is added to the dilution solution at a mass ratio of 1:4, then put into a mixing device and stirred uniformly at a low speed to obtain a pre-dilution agent, then pour the pre-dilution agent into the mixing device and stir for 10 min at a low speed, then filter after stirring is completed, then complete discharging after filtering, and then the stabilizer is obtained.

[0029] Further, the adjusting agent is a mixture of butoxy ethanol and ethylene glycol monobutyl ether, and the active agent is a sulfonate.

[0030] Further, the diluent is selected from acrylic paint, and the leveling agent is selected from polyether modified silicone.

[0031] Further, the water-based polyurethane resin and deionized water are mixed before preparation, then poured into a mixing device and stirred at a high speed for 4 min to obtain a mixed solution.

[0032] Further, trimethylbenzene and dipropylene glycol methyl ether are mixed before preparation and added to an internal mixer, the internal mixer is heated and mixed for 1 h at a temperature of 160℃, and then the additive is obtained after mixing is completed.

[0033] The embodiment also provides a preparation method of the water-based fire-retardant coating, which comprises the following steps: weighing the preparation mixed solution, the additive and other raw materials, and then stirring the raw materials in a mixing device, the stirring speed is 600 rpm, the stirring time is 40 min, and the water-based fire-retardant coating is prepared after uniform stirring.

[0034] The embodiment also provides an application of the water-based fire-retardant coating, wherein the water-based fire-retardant coating is uniformly applied on the building surface in an amount of 400 g / m 2 .

[0035] Embodiment 2

[0036] The preparation method of the water-based fire-retardant coating in the embodiment is basically the same as that in Embodiment 1, except that the specific proportions of the raw materials and the preparation method of the functional additive are different. The specific proportions of the raw materials and the preparation method of the functional additive used in the preparation of the water-based fire-retardant coating are as follows:

[0037] A water-based fire-retardant coating is prepared from 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 a functional additive, 7 parts of a stabilizer, 5 parts of a regulator, 1.5 parts of an active agent, 0.4 parts of a diluent and 0.25 parts of a leveling agent.

[0038] First, the preparation method of the functional additive comprises the following steps:

[0039] Step 1: the modified cardanol and the maleic anhydride mixed solution are added to a three-necked bottle in an amount of 0.05 g / ml, and then stirred and swollen for 1.2 h; the resorcinol is dissolved in the catechol violet dissolving agent in a solid-liquid ratio of 0.25 g / ml, and then added to the three-necked bottle; then the mixture is mixed in a 85℃ water bath for 35 min; the obtained reaction solution is cooled and filtered to obtain a first mixed solution, which is stored and used as needed;

[0040] Step 2: the first mixed solution is mixed with propylene glycol in a mass ratio of 1:1.35 to obtain a second mixed solution; butyl acetate is added to the second mixed solution in an amount of 5.5 times the mass of propylene glycol; a dilution liquid is obtained after mixing and stirring; 4% of the dilution liquid is added to the dilution liquid as a diluent; a dipping liquid is obtained after stirring and mixing; the pH of the dipping liquid is adjusted to neutral; and the obtained product is the functional additive.

[0041] The preparation method of the modified cardanol is as follows: cardanol and zinc acetate are mixed and added into a beaker at a solid-liquid ratio of 0.06 g / ml, and then water bathed at 80 DEG C for 13 min; then a formaldehyde solution with a mass ratio of 55% of the product obtained by water bath is added, and then placed in a centrifuge after standing for 13 min, and the centrifuge is set at 5500 r / min for continuous operation for 2.5 min; then the cardanol phenol-formaldehyde resin is obtained after centrifugal treatment; then the cardanol phenol-formaldehyde resin is mixed with an epoxy chloropropane at a mass ratio of 1:2.1, and then water bathed at 75 DEG C for 1.1 h after mixing; then a sodium hydroxide solution with a mass ratio of 12% of the cardanol phenol-formaldehyde resin is added dropwise every 12 min during the water bath process; and then the modified cardanol is obtained after cooling after the water bath reaction.

[0042] Further, the preparation method of the stabilizer is as follows: titanium white powder with a mass ratio of 1:5 is added into a diluent, and then uniformly stirred in a mixing device at a low speed to obtain a pre-diluent; then the pre-diluent is poured into the mixing device and stirred at a low speed for 11 min; then filtered by selecting a 200-mesh filter cloth after stirring; and then the stabilizer is obtained after discharging after filtering.

[0043] Further, the adjusting agent is a mixture of ethylene glycol monobutyl ether and ethylene glycol, and the active agent is sodium dodecyl sulfonate.

[0044] Further, the diluent is furan propenoic acid, and the leveling agent is organic silicon resin.

[0045] Further, the water-based polyurethane resin and deionized water are mixed in advance before preparation, and then the mixture is poured into a mixing device and stirred at a high speed for 5 min to obtain a mixed solution.

[0046] Further, the trimethylbenzene and dipropylene glycol methyl ether are mixed in advance before preparation and added into an internal mixer, and then the internal mixer is heat-mixed for 1.2 h at a temperature of 170 DEG C; and then the additive is obtained after mixing.

[0047] The embodiment also provides a preparation method of the water-based flame-retardant coating, which comprises the following steps: weighing the preparation mixed solution, the additive and other preparation raw materials as required, and then pouring the raw materials into a mixing device for stirring at a stirring speed of 700 rpm for 45 min; and then the water-based flame-retardant coating is prepared after uniform stirring.

[0048] The embodiment also provides an application of the water-based flame-retardant coating, and the water-based flame-retardant coating is uniformly applied on a building surface in an amount of 400 g / m 2 .

[0049] Example 3

[0050] The preparation method of the water-based flame-retardant coating in this embodiment is basically the same as that in Embodiment 1, except that the specific proportions of the raw materials used and the preparation method of the functional additive are different. The specific proportions of the raw materials used and the preparation method of the functional additive for preparing the water-based flame-retardant coating in this embodiment are as follows:

[0051] A water-based flame-retardant coating, which 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 additive, 8 parts of stabilizer, 6 parts of regulator, 1.8 parts of active agent, 0.6 parts of diluent, and 0.3 parts of leveling agent.

[0052] First, the preparation method of the functional additive includes the following steps:

[0053] Step one, the modified cardanol and maleic anhydride mixed solution is added to a three-necked flask at a dosage ratio of 0.06 g / ml, and stirred and swelled for 1.5 h. Then, the resorcinol solution dissolved in the pyrocatechol violet dissolving agent is added to the three-necked flask at a solid-liquid ratio of 0.3 g / ml, and then mixed in a 90°C water bath for 40 min. The obtained reaction solution is cooled and filtered to obtain a first mixed solution, which is stored and used as needed.

[0054] Step two, the first mixed solution is mixed with propylene glycol at a mass ratio of 1:1.4 to obtain a second mixed solution. Butyl acetate is added to the second mixed solution at a mass ratio of 6 times that of propylene glycol, and then mixed and stirred to obtain a diluent. Diphenyl peroxide is added to the diluent at a mass ratio of 5% of the diluent, and then stirred and mixed to obtain an impregnating solution. The pH of the impregnating solution is adjusted to neutral, and the obtained product is the functional additive.

[0055] The preparation method of the modified cardanol is as follows: cardanol and zinc acetate are mixed and added to a beaker at a solid-liquid ratio of 0.08 g / ml, and then water bathed at 85°C for 15 min. After the water bath, formaldehyde solution is added at a mass ratio of 60% of the water bath product, and then placed in a centrifuge set at 6000 r / min for continuous operation for 3 min. After centrifugation, the cardanol-formaldehyde resin is obtained. The cardanol-formaldehyde resin is mixed with epichlorohydrin at a mass ratio of 1:2.2, and then mixed and water bathed at 80°C for 1.3 h. During the water bath, sodium hydroxide solution is added dropwise every 15 min at a mass ratio of 15% of the cardanol-formaldehyde resin. After the water bath reaction and cooling, the modified cardanol is obtained.

[0056] Further, the preparation method of the stabilizer is as follows: titanium white powder is added to the diluent at a mass ratio of 1:6, and then uniformly stirred in a mixing device at a low speed to obtain a pre-diluent. The pre-diluent is poured into the mixing device and stirred at a low speed for 12 min. After stirring, 200-mesh filter cloth is selected for filtration, and then the product is discharged after filtration to obtain the stabilizer.

[0057] Further, the regulator is selected from ethylene glycol, and the active agent is selected from sodium triflate.

[0058] Further, the diluent is selected from isopropyl acrylate, and the leveling agent is selected from polyether modified silicone.

[0059] Further, the waterborne polyurethane resin and deionized water are pre-mixed before preparation, and after mixing, the mixture is poured into a mixing device for high-speed stirring for 5 min to obtain a mixed solution.

[0060] Further, the trimethylbenzene and dipropylene glycol methyl ether are pre-mixed before preparation and added to the internal mixer, the internal mixer is heated and mixed for 1.5 h, the temperature is 180℃, and after mixing, the additive is obtained.

[0061] The embodiment also provides a preparation method of the water-based flame-retardant coating, which comprises the following steps: weighing the preparation mixed solution, the additive, and other preparation raw materials as required, and then pouring the raw materials into a mixing device for stirring, the stirring speed is 800 rpm, and the stirring time is 50 min, and after uniform stirring, the water-based flame-retardant coating is prepared.

[0062] The embodiment also provides an application of the water-based flame-retardant coating, and the water-based flame-retardant coating is used in an amount of 400 g / m 2 and uniformly applied on a building surface.

[0063] Comparative Example 1, the difference between the embodiment and Example 1 is that the same amount of cardanol is used to replace the functional additive in the embodiment.

[0064] Comparative Example 2, the difference between the embodiment and Example 1 is that the same amount of titanium dioxide is used to replace the stabilizer in the embodiment.

[0065] Comparative Example 3, the difference between the embodiment and Example 1 is that the epoxy chloropropane is not mixed when preparing the functional additive in the embodiment.

[0066] Comparative Example 4, the difference between the embodiment and Example 1 is that the functional additive is not contained in the embodiment.

[0067] Performance test: the related properties of the water-based coating samples provided by Examples 1-3 and Comparative Examples 1-4 are tested respectively, and the obtained test data are recorded in the following table:

[0068]

[0069] Through comparison and analysis of the related data in the table, it can be seen that the water-based building coating prepared by the application not only has good flame-retardant performance, but also has excellent heat insulation performance. Therefore, the water-based flame-retardant coating, the preparation method and the application thereof provided by the application have a wider market prospect and are more suitable for promotion.

[0070] In the description of the application, references to "one embodiment", "an example", "certain examples" etc. mean that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "an example", "certain examples" etc. in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0071] The preferred embodiments of the application disclosed above are only to help explain the application. The preferred embodiments do not describe all of the details of the application and limit the application to the specific embodiments described. Obviously, many modifications and variations of the application can be made in light of the teachings above. The embodiments are chosen and described in order to best explain the principles of the application and its practical application and to enable others skilled in the art to best utilize the application. The application is limited only by the claims and their full scope and equivalents.

Claims

1. An aqueous fire-retardant coating, characterized in that, The functional aid is prepared by the following steps: Step one, the modified cardanol and maleic anhydride mixture is added to a three-necked bottle at a dosage of 0.04-0.06 g / ml, and stirred for 1-1.5 h, then the resorcinol is dissolved in the catechol violet dissolving agent at a solid-liquid ratio of 0.2-0.3 g / ml, and then added to the three-necked bottle, followed by mixing in a water bath at 80-90℃ for 30-40 min, and the obtained reaction solution is cooled and filtered to obtain a first mixture, which is stored for later use. The modified cardanol is prepared by the following steps: cardanol and zinc acetate are mixed in a beaker at a solid-liquid ratio of 0.05-0.08 g / ml, and then water bathed at 75-85℃ for 10-15 min, then a formaldehyde solution with a mass fraction of 50-60% of the product obtained by water bath is added, and then placed in a centrifuge set at 5000-6000 r / min for continuous operation for 2-3 min, and then the cardanol-formaldehyde resin is obtained by centrifugation, and then mixed with epoxy chloropropane at a mass ratio of 1:2-2.2, and then water bathed at 70-80℃ for 1-1.3 h, and then sodium hydroxide solution with a mass fraction of 10-15% of the cardanol-formaldehyde resin is added dropwise every 10-15 min during the water bath process, and then cooled after the water bath reaction to obtain the modified cardanol. Step two, the first mixture is added to propylene glycol at a mass ratio of 1:1.3-1.4 to obtain a second mixture, butyl acetate with a mass of 5-6 times that of the second mixture is added, and then stirred to obtain a diluent, and then the diluent is added with 3%-5% of the diluent by mass of dibenzoyl peroxide, and then stirred to obtain an impregnating solution, and then the pH of the impregnating solution is adjusted to neutral, and then the functional aid is obtained. The stabilizer is prepared by the following steps: titanium white powder with a mass ratio of 1:4-6 is added to the diluent, and then uniformly stirred in a mixing device at a low speed to obtain a pre-diluent, and then the pre-diluent is poured into the mixing device and stirred at a low speed for 10-12 min, and then filtered with a 200-mesh filter cloth after stirring, and then discharged after filtration to obtain the stabilizer. The adjusting agent is selected from one or more combinations of butoxy ethanol, ethylene glycol monobutyl ether, and ethylene glycol, and the active agent is selected from any one of sulfonate, sodium dodecyl sulfonate, and sodium triflate.

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

3. The water-based fire-retardant coating according to claim 1, characterized in that: The water-based polyurethane resin and deionized water are pre-mixed before preparation, and then poured into a mixing device and stirred at a high speed for 4-6 min to obtain a mixture.

4. The water-based fire-retardant coating of claim 1, wherein: ​ 5. The water-based fire-retardant coating of claim 1, wherein: The trimethylbenzene and the dipropylene glycol methyl ether are premixed before preparation and added into the internal mixer, the internal mixer is kept at a temperature of 160-180℃ for 1-1.5h, and the additive is obtained after mixing.

6. A process for the preparation of a waterborne fire-retardant coating according to any one of claims 1 to 5, characterized in that, The steps include: weighing the preparation mixture, the additive and other preparation raw materials as needed, and then putting the raw materials into a mixing device for stirring, the stirring speed is 600-800rpm, and the stirring time is 40-50min, and the water-based flame-retardant coating is prepared after uniform stirring; The water-based polyurethane resin and the deionized water are premixed before preparation, and the mixture is poured into a mixing device for high-speed stirring for 4-6min to obtain a mixture; The trimethylbenzene and the dipropylene glycol methyl ether are premixed before preparation and added into the internal mixer, the internal mixer is kept at a temperature of 160-180℃ for 1-1.5h, and the additive is obtained after mixing.

7. Use of the water-based fire-retardant paint prepared according to the method of claim 6, characterized in that: The water-based fire-retardant coating is uniformly applied on the building surface in a dosage of 400 / m 2 2 during use.

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