Water-based fireproof paint with night high temperature early warning function and preparation method thereof

Abstract

The application relates to the field of fireproof coatings, and particularly discloses a water-based fireproof coating with night high-temperature early warning function and a preparation method thereof. The water-based fireproof coating with night high-temperature early warning function comprises the following components in percentage by mass: 38-45% of acrylic emulsion, 13-18% of night light powder, 8-12% of temperature changing agent, 2-5% of modified mica powder, 8-12% of modified glass fiber, 1-5% of film forming aid, 0.1-1% of thickening agent, 0.1-1% of defoaming agent, 0.1-1% of dispersing agent and 15-20% of water. The preparation method comprises the following steps: mixing the night light powder, the temperature changing agent, the dispersing agent and the water according to the proportion, uniformly mixing, adding the acrylic emulsion, uniformly mixing, adding the film forming aid, the defoaming agent and the thickening agent, uniformly mixing, adding the modified mica powder and the modified glass fiber, and uniformly mixing to obtain the water-based fireproof coating with night high-temperature early warning function. The water-based fireproof coating has the advantages of night fire early warning function and good fireproof performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fireproof coatings, more particularly, it relates to a water-based fireproof coating with night high-temperature early warning function and a preparation method thereof. BACKGROUND

[0002] Temperature-sensitive color-changing paint is a special paint that can change color with temperature. Temperature-sensitive color-changing paint has been applied in the field of fireproof coatings. At room temperature, the paint shows no color or a certain specific color. When a fire occurs and the temperature rises to the color-changing temperature range of the paint, the paint changes color, serving as a warning.

[0003] Related technology discloses a weather-resistant temperature-sensitive cable fireproof coating, which comprises acrylic emulsion, ammonium polyphosphate, melamine, pentaerythritol, white carbon black, titanium white, temperature-sensitive color-changing agent and other additives and water. The temperature-sensitive color-changing agent can change color when the film temperature rises to 60 DEG C, and can provide an early warning function for the coating against fire hazards.

[0004] However, when the environment is dark or the light is insufficient, the temperature-sensitive color-changing of the film is difficult to be identified to play a fireproof warning role, and thus needs to be improved. SUMMARY

[0005] In order to improve the color-changing identification of temperature-sensitive color-changing paint in dim environment, the present application provides a water-based fireproof coating with night high-temperature early warning function and a preparation method thereof.

[0006] In the first aspect, the present application provides a water-based fireproof coating with night high-temperature early warning function, which adopts the following technical solution:

[0007] A water-based fireproof coating with night high-temperature early warning function comprises the following components by mass percentage:

[0008] acrylic emulsion 38-45%,

[0009] night light powder 13-18%,

[0010] temperature-changing agent 8-12%,

[0011] modified mica powder 2-5%,

[0012] modified glass fiber 8-12%,

[0013] film-forming aid 1-5%,

[0014] thickening agent 0.1-1%,

[0015] defoaming agent 0.1-1%,

[0016] dispersant 0.1-1%,

[0017] Water 15-20%.

[0018] By adopting the technical scheme, the luminescent powder is added in the fireproof paint, so that when a fire occurs in a dim environment, the observer can also observe the obvious color change of the fireproof paint; in the dim environment, the luminescent powder shows fluorescence, the temperature change agent shows no color at low temperature or room temperature, and the color of the fireproof paint is the fluorescence emitted by the luminescent powder; when a fire occurs and the ambient temperature rises, the temperature change agent changes color and shows an obvious color, and the color of the fireproof paint is the mixed color of the fluorescence of the luminescent powder and the color of the temperature change agent, which is convenient for the observer to observe and judge the fire, so that the fireproof paint can also play a role in early warning of fire hazards in a dim environment; meanwhile, the application selects acrylic emulsion as the film-forming resin, and the transparency of the acrylic resin is high, so that the color change of the fireproof paint is more obvious.

[0019] On the other hand, by adding modified mica powder and modified glass fiber, the fireproof paint has better heat insulation and fireproof effect; the modified mica powder has a high expansion ratio after burning, can form a uniform and dense carbon layer, and has a certain insulating effect on gas and heat exchange, so as to give the paint better fireproof and flame-retardant effect, and the modified mica powder has better ultraviolet resistance, humidity resistance and weather resistance, which is beneficial to improve the weather resistance and service life of the fireproof paint; the modified glass fiber has good heat insulation effect, high temperature resistance and good chemical resistance, which can enhance the fireproof and heat insulation performance of the paint, and is beneficial to enhance the wear resistance and mechanical strength of the paint, and is beneficial to improve the service life of the fireproof paint.

[0020] Preferably, the luminescent powder is a polysilane microcapsule coated light-induced energy storage fluorescent powder.

[0021] By adopting the above technical scheme, the light-induced energy storage fluorescent powder has no obvious color in sufficient light, and shows obvious fluorescence in a dim environment, which is convenient for observation; the fluorescent powder is wrapped by the polysilane microcapsule, which improves the uniformity of the dispersion of the fluorescent powder in the paint, makes the fluorescence coloration more uniform, and protects the light-induced energy storage fluorescent powder, which is beneficial to improve the weather resistance, chemical resistance and other use properties of the fluorescent powder, and is beneficial to improve the service life of the fluorescent powder.

[0022] Preferably, the preparation method of the luminescent powder is as follows:

[0023] Ethyl orthosilicate and phenyltrimethoxysilane are dissolved in an alcohol-water solution according to a molar ratio of (0.3-0.6):(0.4-0.7), the pH value is adjusted to 3-4, hydrolysis is carried out at 60-80℃ for 30-60min, perfluorosilane coupling agent and light-induced energy storage fluorescent powder are added to the reaction solution, and after being uniformly dispersed, reaction is carried out for 3-6h, then filtration, washing and vacuum drying are carried out to obtain the luminescent powder.

[0024] Preferably, the amount of the perfluorosilane coupling agent is (0.6-0.9):1 in mole ratio to the total amount of the tetraethyl orthosilicate and the phenyltrimethoxysilane, and the amount of the perfluorosilane coupling agent is 1:(0.01-0.03) g / mol to the amount of the photo-induced energy-storing fluorescent powder.

[0025] Preferably, the perfluorosilane coupling agent is heptadecafluorodecyltriethoxysilane.

[0026] By adopting the technical scheme, the polysilane microcapsule containing phenyl and fluorine elements can be prepared, which is beneficial to improve the high-temperature resistance, water resistance, corrosion resistance and weather resistance of the night glow powder, protect the effect of the night glow powder in complex environment, and prolong the service life of the fireproof coating.

[0027] Preferably, the modified mica powder is obtained by surface modification of mica powder with a coupling agent and polyvinyl acetate.

[0028] Preferably, the preparation method of the modified mica powder specifically comprises the following steps:

[0029] The coupling agent and polyvinyl acetate are added into isopropyl alcohol, mixed uniformly, and then the mica powder is added and ultrasonically treated for 1-3 h, filtered, washed, and dried to obtain the modified mica powder.

[0030] By adopting the technical scheme, the surface energy of the mica powder can be reduced, the organic active groups are grafted on the surface of the mica powder, the compatibility of the mica powder with the acrylic emulsion is improved, the uniform dispersion of the mica powder is promoted, and the fireproof effect of the mica powder is fully played.

[0031] Preferably, the modified glass fiber is obtained by reacting the glass fiber after hydrogen peroxide activation treatment and coupling agent pre-modification with maleic anhydride grafted EPDM rubber in the presence of a solvent and an initiator.

[0032] By adopting the technical scheme, on the one hand, the compatibility of the glass fiber with the acrylic emulsion is improved, the dispersion of the glass fiber in the fireproof coating is promoted, and the formation of the inorganic fiber network is promoted, which is beneficial to enhance the mechanical strength of the fireproof coating; on the other hand, the grafting and wrapping of the glass fiber by the maleic anhydride grafted EPDM rubber improves the tensile strength of the inorganic fiber network and enhances the wear resistance, which is beneficial to improve the toughness and heat insulation and fireproof effect of the fireproof coating.

[0033] Preferably, the preparation method of the modified glass fiber specifically comprises the following steps:

[0034] The glass fiber is immersed into hydrogen peroxide, ultrasonically treated for 2-3 h, and then filtered and dried to obtain the hydroxylated glass fiber.

[0035] Hydroxylated glass fiber and coupling agent are added to an alcohol solution, the pH value is adjusted to 4-5, stirred at 40-60℃ for 20-40 min, filtered, and dried to obtain pre-modified glass fiber.

[0036] Maleic anhydride-grafted EPDM rubber was dissolved in acetone, benzoyl peroxide was added and the pH was adjusted to 3-5, the pre-modified glass fiber was immersed in it, stirred at 80-110℃ for 4-8 hours, filtered, washed three times with acetone and water respectively, and dried to obtain modified glass fiber.

[0037] Preferably, the mass ratio of the maleic anhydride-grafted EPDM rubber to the pre-modified glass fiber is (0.4-0.8):1; and the mass of the benzoyl peroxide is 0.1-2% of the maleic anhydride-grafted EPDM rubber.

[0038] By adopting the above technical solution, hydrogen peroxide is used to activate glass fiber, thereby improving its reactivity. Coupling agent treatment allows active organic groups to be grafted onto the surface of the glass fiber. Then, under the action of an initiator, these groups react with the anhydride groups of maleic anhydride-grafted EPDM rubber, allowing the maleic anhydride-grafted EPDM rubber to be grafted onto the glass fiber. This effectively improves the tensile strength and wear resistance of the glass fiber.

[0039] Preferably, the film-forming aid is selected from one or more of propylene glycol phenyl ether, butyl acrylate, methyl methacrylate, methacrylic acid, and dodecyl alcohol ester.

[0040] Preferably, the thickener is hydroxyethyl cellulose.

[0041] Preferably, the dispersant is a polycarboxylate dispersant.

[0042] Preferably, the defoamer is a polyether-modified silicone defoamer.

[0043] By adopting the above technical solutions, thickeners and dispersants can promote the dispersion of phosphorescent powder and thermochromic agents, making the color development of fire-retardant coatings more uniform and stabilizing the viscosity of the fire-retardant coating system, thus reducing the possibility of precipitation. Polyether-modified silicone defoamers have better defoaming properties, which can help improve the flow properties of fire-retardant coatings and enhance their processability.

[0044] Secondly, this application provides a method for preparing a water-based fire-retardant coating with a nighttime high-temperature warning function, using the following technical solution:

[0045] A method for preparing a water-based fire-retardant coating with nighttime high-temperature warning function includes the following steps:

[0046] According to the formula, luminescent powder, thermochromic agent, dispersant and water are mixed and then acrylic emulsion is added and mixed. Then film-forming aid, defoamer and thickener are added and mixed. Modified mica powder and modified glass fiber are added and mixed to obtain a water-based fireproof coating with nighttime high temperature warning function.

[0047] By adopting the above technical solutions, water-based fire-retardant coatings with flame-retardant and fire-prevention effects and fire warning functions can be produced, expanding the application range and safety performance of fire-retardant coatings in complex environments.

[0048] In summary, this application has the following beneficial effects:

[0049] 1. Because this application adds luminescent powder to the fire-retardant coating, observers can still observe the obvious color change of the fire-retardant coating in dim environments when a fire occurs, making it easier for observers to observe and judge the fire situation. This allows the fire-retardant coating to provide an early warning function for fire hazards even in dim environments. At the same time, this application uses acrylic emulsion as the film-forming resin. Acrylic resin has high transparency, which makes the color change of the fire-retardant coating easier to observe.

[0050] 2. This application improves the heat insulation and fireproofing effect of fire-retardant coatings by adding modified mica powder and modified glass fiber. Modified mica powder has a high expansion ratio after combustion, which can form a uniform and dense carbonaceous layer, playing a certain role in isolating gas and heat exchange, giving the coating better fireproof and flame-retardant effects. In addition, modified mica powder has good UV resistance, moisture resistance and weather resistance, which is conducive to improving the weather resistance and service life of fire-retardant coatings. Modified glass fiber has good heat insulation effect, strong high temperature resistance and good chemical resistance, which can enhance the fireproof and heat insulation performance of coatings, and is conducive to enhancing the wear resistance and mechanical strength of coatings, which is conducive to improving the service life of fire-retardant coatings.

[0051] 3. The phosphor in this application is preferably a photoluminescent phosphor encapsulated with polysilane microcapsules. By encapsulating the phosphor with polysilane microcapsules, the dispersion uniformity of the phosphor in the coating is improved, the fluorescence color development is more uniform, and the photoluminescent phosphor is protected. This is beneficial to improving the phosphor's weather resistance, chemical resistance and other performance properties, and thus to extending the phosphor's service life. Detailed Implementation

[0052] To further aid in understanding the technical solution of this invention, several specific implementation examples are provided below to describe the technical solution of this invention in more detail. All of these described embodiments are only some embodiments of this invention, and not all of them.

[0053] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments; and the reaction apparatus, monomer compounds, initiators, coupling agents, defoamers, and organic solvents involved in the following embodiments are all commercially available.

[0054] The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0055] The following examples further illustrate the present invention, but the invention is not limited thereto. Unless otherwise specified in the examples, all percentages (%) are mass percentages.

[0056] Preparation Example

[0057] Preparation Example 1

[0058] This preparation example provides a phosphorescent powder, and the preparation method is as follows:

[0059] 312g of tetraethyl orthosilicate, 445.5g of phenyltrimethoxysilane, and 500g of 50wt% ethanol aqueous solution were added to a reaction vessel. Then, 35% hydrochloric acid was added dropwise to adjust the pH value to 3.4. The mixture was initially hydrolyzed at 65℃ for 45min. Then, 1830g of heptadecafluorodecyltriethoxysilane and 200g of phosphor were added and stirred to disperse evenly. After reacting for 4h, the mixture was filtered, washed three times with acetone, and then washed three times with water. The mixture was then vacuum dried at 85℃ to obtain the phosphorescent powder.

[0060] In this preparation example, the phosphor is a commercially available photoluminescent phosphor that emits yellow-green light, with the chemical composition SrAl2O4:Eu,Dy.

[0061] Preparation Example 2

[0062] The only difference between this preparation example and Preparation Example 1 is that the method for preparing the phosphorescent powder is as follows:

[0063] 208g of tetraethyl orthosilicate, 462g of phenyltrimethoxysilane, and 500g of 50wt% ethanol aqueous solution were added to a reaction vessel. Then, 35% hydrochloric acid was added dropwise to adjust the pH value to 3.4. The mixture was initially hydrolyzed at 65℃ for 45min. Then, 1220g of heptadecafluorodecyltriethoxysilane and 200g of phosphor were added and stirred to disperse evenly. After reacting for 4h, the mixture was filtered, washed three times with acetone, and then washed three times with water. The mixture was then vacuum dried at 85℃ to obtain the phosphorescent powder.

[0064] Preparation Example 3

[0065] The only difference between this preparation example and Preparation Example 1 is that the method for preparing the phosphorescent powder is as follows:

[0066] 832g of tetraethyl orthosilicate, 528g of phenyltrimethoxysilane, and 1200g of 50wt% ethanol aqueous solution were added to a reaction vessel. Then, 35% hydrochloric acid was added dropwise to adjust the pH to 3.4. The mixture was initially hydrolyzed at 65℃ for 45min. Then, 3660g of heptadecafluorodecyltriethoxysilane and 200g of phosphor were added and stirred to disperse evenly. After reacting for 4h, the mixture was filtered, washed three times with acetone, and then washed three times with water. The mixture was then vacuum dried at 85℃ to obtain the phosphorescent powder.

[0067] Preparation Example 4

[0068] The only difference between this preparation example and Preparation Example 1 is that the method for preparing the phosphorescent powder is as follows:

[0069] 780g of tetraethyl orthosilicate and 500g of 50wt% ethanol aqueous solution were added to a reaction vessel, and then 35% hydrochloric acid was added dropwise to adjust the pH value to 3.4. The mixture was initially hydrolyzed at 65℃ for 45min. Then, 1830g of heptadecafluorodecyltriethoxysilane and 200g of phosphor were added and stirred to disperse evenly. After reacting for 4h, the mixture was filtered, washed three times with acetone, and then washed three times with water. The mixture was then vacuum dried at 85℃ to obtain the phosphorescent powder.

[0070] Preparation Example 5

[0071] The only difference between this preparation example and Preparation Example 1 is that the method for preparing the phosphorescent powder is as follows:

[0072] 312g of tetraethyl orthosilicate, 445.5g of phenyltrimethoxysilane, and 500g of 50wt% ethanol aqueous solution were added to a reaction vessel. Then, 35% hydrochloric acid was added dropwise to adjust the pH value to 3.4. The mixture was initially hydrolyzed at 65℃ for 45min. Then, 745g of KH570 and 200g of phosphor were added and stirred to disperse evenly. After reacting for 4h, the mixture was filtered, washed three times with acetone, and then washed three times with water. The mixture was then vacuum dried at 85℃ to obtain the phosphorescent powder.

[0073] Preparation Example 6

[0074] This preparation example provides a modified mica powder, which is obtained by modifying mica powder with a coupling agent and polyvinyl acetate. The preparation method is as follows:

[0075] Add 10g of silane coupling agent KH550 and 50g of polyvinyl acetate to 500ml of isopropanol, add 35% hydrochloric acid to adjust the pH to 5.5, mix well, immerse 100g of mica powder in it, sonicate for 2h, filter, wash three times with water, and vacuum dry at 60℃ to obtain modified mica powder.

[0076] In this preparation example, the polyvinyl acetate is model number LBW-2333.

[0077] Preparation Example 7

[0078] The only difference between this preparation example and Preparation Example 6 is that the modified mica powder is obtained by surface modification of mica powder with a coupling agent. The preparation method is as follows:

[0079] Add 60g of silane coupling agent KH550 to 500ml of isopropanol, add 35% hydrochloric acid to adjust the pH to 5.5, mix well, immerse 100g of mica powder in it, sonicate for 2h, filter, wash with water three times, and vacuum dry at 60℃ to obtain modified mica powder.

[0080] Preparation Example 8

[0081] This preparation example provides a modified glass fiber, which is obtained by activating glass fiber with hydrogen peroxide and pre-modifying it with a coupling agent, followed by reacting it with maleic anhydride-grafted EPDM rubber in the presence of a solvent and an initiator. The specific preparation method is as follows:

[0082] 100g of glass fiber was immersed in 500ml of 4% hydrogen peroxide solution, ultrasonically treated for 2h, filtered, washed three times with water, and vacuum dried at 40℃ to obtain hydroxylated glass fiber.

[0083] 25g of silane coupling agent KH570 was added to 500g of 50% ethanol solution, and 35% hydrochloric acid was added dropwise to adjust the pH value to 4.5. 100g of hydroxylated glass fiber was immersed in the solution, heated to 55℃ and stirred for 30min, filtered, washed three times with water, and vacuum dried at 85℃ to obtain pre-modified glass fiber.

[0084] Dissolve 60g of maleic anhydride-grafted EPDM rubber in 300ml of acetone, add 3g of benzoyl peroxide, and adjust the pH to 4.5 with 35% hydrochloric acid. Immerse 100g of pre-modified glass fiber in the solution, heat to 85℃ and stir for 6 hours. Filter, wash three times with acetone, then wash three times with water, and dry under vacuum at 105℃ to obtain modified glass fiber.

[0085] Preparation Example 9

[0086] The only difference between this preparation example and Preparation Example 7 is that the modified glass fiber is obtained by surface modification of glass fiber after activation treatment with hydrogen peroxide and then by coupling agent. The preparation method is as follows:

[0087] 100g of glass fiber was immersed in 500ml of 4% hydrogen peroxide solution, ultrasonically treated for 2h, filtered, washed three times with water, and vacuum dried at 40℃ to obtain hydroxylated glass fiber.

[0088] 25g of silane coupling agent KH570 was added to 500g of 50% ethanol solution, and 35% hydrochloric acid was added dropwise to adjust the pH value to 4.5. 100g of hydroxylated glass fiber was then immersed in the solution, heated to 55℃ and stirred for 30min. The solution was filtered, washed three times with water, and dried under vacuum at 85℃ to obtain modified glass fiber.

[0089] Preparation Example 10

[0090] The only difference between this preparation example and Preparation Example 7 is that the modified glass fiber is obtained by pre-modifying the glass fiber with a coupling agent and then reacting it with maleic anhydride-grafted EPDM rubber in the presence of a solvent and an initiator. The preparation method is as follows:

[0091] 25g of silane coupling agent KH570 was added to 500g of 50% ethanol solution, and 35% hydrochloric acid was added dropwise to adjust the pH value to 4.5. 100g of glass fiber was immersed in the solution, heated to 55℃ and stirred for 30min, filtered, washed three times with water, and vacuum dried at 85℃ to obtain pre-modified glass fiber.

[0092] Dissolve 60g of maleic anhydride-grafted EPDM rubber in 300ml of acetone, add 3g of benzoyl peroxide, and adjust the pH to 4.5 with 35% hydrochloric acid. Immerse 100g of pre-modified glass fiber in the solution, heat to 85℃ and stir for 6 hours. Filter, wash three times with acetone, then wash three times with water, and dry under vacuum at 105℃ to obtain modified glass fiber.

[0093] Example

[0094] Example 1

[0095] This embodiment discloses a water-based fireproof coating with nighttime high temperature warning function, comprising the following components by weight: 400g acrylic emulsion, 150g luminescent powder, 100g thermochromic agent, 40g modified mica powder, 100g modified glass fiber, 20g methyl methacrylate, 2g hydroxyethyl cellulose, 2g polyether modified silicone defoamer, 6g polycarboxylate dispersant, and 180g deionized water.

[0096] In this embodiment, the acrylic emulsion is PRIMAL HPP-902, the phosphorescent powder is a commercially available photoluminescent phosphor that emits yellow-green light, and its chemical composition is SrA12O4:Eu,Dy; the thermochromic agent is Runba WS1610 red thermochromic agent; the modified mica powder was prepared in Preparation Example 6; the modified glass fiber was prepared in Preparation Example 8; the polyether-modified silicone defoamer is Foamde 362ED 2522; and the polycarboxylate dispersant is dispersant 5040, model number HX-027.

[0097] The preparation method of water-based fire-retardant coating with nighttime high temperature warning function is as follows:

[0098] Mix the above-mentioned phosphorescent powder, thermochromic agent, polycarboxylate dispersant, and water, stir evenly, add methyl methacrylate, polyether-modified silicone defoamer, and hydroxyethyl cellulose, stir evenly, then add modified mica powder and modified glass fiber, stir and mix evenly to obtain a water-based fireproof coating with nighttime high temperature warning function.

[0099] Example 2

[0100] The only difference between this embodiment and Embodiment 1 is that the water-based fire-retardant coating with nighttime high-temperature warning function includes the following components by weight: 380g acrylic emulsion, 180g luminescent powder, 80g thermochromic agent, 50g modified mica powder, 80g modified glass fiber, 50g methyl methacrylate, 1g hydroxyethyl cellulose, 1g polyether modified silicone defoamer, 10g polycarboxylate dispersant, and 168g deionized water.

[0101] Example 3

[0102] The only difference between this embodiment and Embodiment 1 is that the water-based fire-retardant coating with nighttime high-temperature warning function includes the following components by weight: 450g acrylic emulsion, 130g luminescent powder, 120g thermochromic agent, 20g modified mica powder, 120g modified glass fiber, 10g methyl methacrylate, 10g hydroxyethyl cellulose, 10g polyether modified silicone defoamer, 1g polycarboxylate dispersant, and 129g deionized water.

[0103] Example 4

[0104] The only difference between this embodiment and Example 1 is that the luminescent powder was prepared in Example 1.

[0105] Example 5

[0106] The only difference between this embodiment and Example 4 is that the luminescent powder was prepared in Example 2.

[0107] Example 6

[0108] The only difference between this embodiment and Example 4 is that the luminescent powder was prepared in Example 3.

[0109] Example 7

[0110] The only difference between this embodiment and Example 4 is that the luminescent powder was prepared in Example 4.

[0111] Example 8

[0112] The only difference between this embodiment and Example 4 is that the luminescent powder was prepared in Example 5.

[0113] Example 9

[0114] The only difference between this embodiment and Example 1 is that the modified mica powder was prepared in Example 7.

[0115] Example 10

[0116] The only difference between this embodiment and Example 1 is that the modified mica powder was prepared from Preparation Example 9.

[0117] Example 11

[0118] The only difference between this embodiment and Example 1 is that the modified mica powder was prepared from Preparation Example 10.

[0119] Comparative Example

[0120] Comparative Example 1

[0121] The only difference between this comparative example and Example 1 is that the water-based fire-retardant coating comprises the following components by weight: 400g acrylic emulsion, 250g thermochromic agent, 40g mica powder, 100g glass fiber, 20g methyl methacrylate, 2g hydroxyethyl cellulose, 2g polyether-modified silicone defoamer, 6g polycarboxylate dispersant, and 180g deionized water.

[0122] The preparation method of water-based fire-retardant coating is as follows:

[0123] Mix the thermochromic agent, polycarboxylate dispersant, and water according to the above-mentioned quantities, and stir until homogeneous. Add methyl methacrylate, polyether-modified silicone defoamer, and hydroxyethyl cellulose, and stir until homogeneous. Then add modified mica powder and modified glass fiber, and stir until well mixed to obtain a water-based fire-retardant coating with nighttime high-temperature warning function.

[0124] Comparative Example 2

[0125] The only difference between this comparative example and Example 1 is that unmodified mica powder is used instead of modified mica powder, and unmodified glass fiber is used instead of modified glass fiber. The water-based fireproof coating with nighttime high temperature warning function includes the following components by weight: 400g acrylic emulsion, 150g luminescent powder, 100g thermochromic agent, 40g mica powder, 100g glass fiber, 20g methyl methacrylate, 2g hydroxyethyl cellulose, 2g polyether modified silicone defoamer, 6g polycarboxylate dispersant, and 180g deionized water.

[0126] Performance testing test 1: Nighttime color development test: The water-based fireproof coatings prepared in each example and comparative example were coated on aluminum plates with a coating thickness of about 3 mm. After curing, aluminum plate samples with fireproof coating were obtained. Each aluminum plate sample was left to stand in a bright environment for 2 hours. Then, in a dark indoor environment, each aluminum plate sample was placed on a heater and the side of the aluminum plate sample without fireproof coating was heated (from room temperature to 80°C). An observer observed the color change of the fireproof coating at a distance of 10 m from the aluminum plate sample.

[0127] Test 2: Referring to GB 12441-2018 "Decorative Fire Retardant Coatings", the flame retardant time, damp heat resistance, and impact resistance of the water-based fire retardant coatings prepared in each example and comparative example were tested.

[0128] The results are summarized in Table 1.

[0129] Table 1

[0130]

[0131]

[0132]

[0133] As can be seen from Examples 1-3 and Table 1, the water-based fire-retardant coating with nighttime high-temperature warning function prepared in this application has excellent flame-retardant and fire-retardant properties and high-temperature warning function, and also has high weather resistance and impact resistance, making it suitable for various complex environments. Furthermore, as can be seen from Examples 1 and Comparative Example 1, by adding luminescent powder and thermochromic agents to the fire-retardant coating, it is easier for observers to observe the color change of the fire-retardant coating in dim environments, thus realizing the nighttime fire warning function of the fire-retardant coating and expanding its application range.

[0134] As can be seen from Examples 1 and 4-8, and Table 1, the use of polysilane microcapsules-encapsulated fluorescent powder as luminescent powder promotes the improvement of fire resistance and damp heat resistance of fire-retardant coatings to a certain extent. This may be because the long chains of polysilane can interact with the acrylic emulsion organic system, and the aromatic groups in the long chains of polysilane help improve the thermal stability of the fire-retardant coating system and promote the increase of flame retardant time. Furthermore, the use of perfluorosilane coupling agents as end-capping agents, with -CF3 side groups, can impart certain halogenated flame retardant effects to polysilane, promoting the formation of the expanded char layer of modified mica powder and the dehydration and carbonization of acrylic polymers, thereby improving the flame retardant and fire-retardant performance of the fire-retardant coating.

[0135] As can be seen from Example 1, Comparative Example 2, and Table 1, modifying mica powder and glass fiber is beneficial for improving the fire resistance and mechanical strength of fire-retardant coatings. As can be seen from Example 1, Example 9, and Table 1, using a coupling agent in conjunction with polyvinyl acetate to modify mica powder can further improve the fire-retardant properties of fire-retardant coatings. This may be because the thermal decomposition of polyvinyl acetate at high temperatures promotes the thermal expansion of mica powder, thereby improving the flame-retardant properties of the fire-retardant coating. As can be seen from Examples 1 and 10, and Table 1, grafting maleic anhydride-grafted EPDM rubber with glass fiber can improve the fire resistance and mechanical strength of the fire-retardant coating. This is likely because maleic anhydride-grafted EPDM rubber itself has excellent high-temperature resistance, and cross-linking with acrylic emulsion is beneficial to improving the high-temperature resistance of the fire-retardant coating. Furthermore, maleic anhydride-grafted EPDM rubber can improve the toughness of glass fiber and promote the increase of tensile strength of the glass fiber inorganic fiber network, thereby improving the impact resistance of the fire-retardant coating. As can be seen from Examples 1 and 11, the activation treatment of glass fiber with hydrogen peroxide can improve the performance of the fire-retardant coating. This is likely because the reactivity of glass fiber is enhanced after hydrogen peroxide activation, increasing the grafting rate of coupling agent and maleic anhydride-grafted EPDM rubber.

[0136] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A water-based fire-retardant coating with nighttime high-temperature warning function, characterized in that, It consists of the following components by mass percentage: Acrylic emulsion 38-45%, 13-18% phosphorescent powder Thermochromic agent 8-12%, Modified mica powder 2-5%, Modified glass fiber 8-12%, Film-forming aid 1-5%, Thickener 0.1-1%, Defoamer 0.1-1%, Dispersant 0.1-1%, Water 15-20%; The phosphorescent powder is a photoluminescent powder encapsulated in polysilane microcapsules; the preparation method of the phosphorescent powder includes: Tetraethyl orthosilicate and phenyltrimethoxysilane were dissolved in an alcohol-water solution at a molar ratio of (0.3-0.6):(0.4-0.7), the pH was adjusted to 3-4, and hydrolysis was carried out at 60-80℃ for 30-60 min. Perfluorosilane coupling agent and photoluminescent phosphor were added to the reaction solution, and after being dispersed evenly, the reaction was carried out for 3-6 h. The solution was then filtered, washed, and vacuum dried to obtain phosphorescent powder. The preparation method of the modified mica powder includes the following steps: The coupling agent and polyvinyl acetate were added to isopropanol and mixed evenly. Then mica powder was added, and the mixture was ultrasonically treated for 1-3 hours. The mixture was then filtered, washed, and dried to obtain modified mica powder. The method for preparing the modified glass fiber includes the following steps: Glass fibers are immersed in hydrogen peroxide, ultrasonically treated for 2-3 hours, and then filtered and dried to obtain hydroxylated glass fibers. Hydroxylated glass fiber and coupling agent are added to an alcohol solution, the pH value is adjusted to 4-5, stirred at 40-60℃ for 20-40 min, filtered, and dried to obtain pre-modified glass fiber. Maleic anhydride-grafted EPDM rubber was dissolved in acetone, benzoyl peroxide was added and the pH was adjusted to 3-5, the pre-modified glass fiber was immersed in it, stirred at 80-110℃ for 4-8 hours, filtered, washed three times with acetone and water respectively, and dried to obtain modified glass fiber.

2. The water-based fire-retardant coating with nighttime high-temperature warning function according to claim 1, characterized in that: The film-forming aid is selected from one or more of propylene glycol phenyl ether, butyl acrylate, methyl methacrylate, methacrylic acid, and dodecyl alcohol ester.

3. The water-based fire-retardant coating with nighttime high-temperature warning function according to claim 1, characterized in that: The thickener is hydroxyethyl cellulose.

4. The water-based fire-retardant coating with nighttime high-temperature warning function according to claim 1, characterized in that: The dispersant is a polycarboxylate dispersant.

5. The water-based fire-retardant coating with nighttime high-temperature warning function according to claim 1, characterized in that: The defoamer is a polyether-modified silicone defoamer.

6. The water-based fire-retardant coating with nighttime high-temperature warning function according to any one of claims 1-5, characterized in that: The coating preparation method includes the following steps: According to the formula, luminescent powder, thermochromic agent, dispersant and water are mixed and then acrylic emulsion is added and mixed. Then film-forming aid, defoamer and thickener are added and mixed. Modified mica powder and modified glass fiber are added and mixed to obtain a water-based fireproof coating with nighttime high temperature warning function.

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