Environmentally friendly fire retardant thermal insulation paint and producing method thereof

Abstract

To provide an environmentally friendly fire retardant thermal insulation paint, excellent in adhesiveness of a coating, difficult to fall off, and having relatively high fire retardancy, thermal insulation and crack resistance and a producing method thereof.SOLUTION: A fire-retardant thermal insulation paint is produced from raw materials composed, by weight percentage, of 8 to 15% styrene-acrylic emulsion, 10 to 18% adhesion promoter, 10 to 20% thermal insulation agent, 20 to 30% fire retardant, 2 to 5% wetting dispersant, 3 to 6% viscosity modifier, 4 to 9% other additives, and the remainder water. The producing method is as follows: In step S1, the viscosity modifier and water are mixed to prepare a mixed solution; in step S2, the adhesion promoter and wetting dispersant are mixed with the mixed solution to prepare a dispersion; in step S3, the fire retardant is mixed with the dispersion to prepare a flame-retardant dispersion; and in step S4, the styrene-acrylic emulsion, thermal insulation agent, and other additives are mixed with the fire-retardant dispersion.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present application relates to the field of environmentally friendly functional coatings for architecture, more particularly, it relates to environmentally friendly fire-retardant heat-insulating coatings and methods for producing the same. [Background technology]

[0002] In recent years, with the development of insulation and heat retention technology for building exterior walls, the insulation and heat retention paint for building walls has gradually shifted from interior walls to exterior walls, and the insulation and heat retention paint for building walls is a functional paint with insulation and heat retention properties.

[0003] Heat insulating and thermal insulation paints for building walls have excellent heat insulating and thermal insulation properties, but they have low flame retardancy and are prone to burning in the event of a fire, posing a significant risk to human life safety and likely to cause significant economic losses.

[0004] In order to improve the flame retardancy of heat insulating paints for building walls, it is common to add flame retardants to the heat insulating paints, as described in the prior art document GB / T25261-2018. Flame retardants are generally powder fillers, and when added to heat insulating paints, the coating performance of the heat insulating paints is likely to deteriorate, and the coating layer formed on the applied building walls is likely to crack and fall off, reducing the stability of the heat insulating paints when used on building walls. Summary of the Invention [Problem to be solved by the invention]

[0005] The present application provides an environmentally friendly flame-retardant heat insulating paint and a manufacturing method thereof to solve the problem that conventional flame-retardant heat insulating paints are prone to cracking and falling off during use, reducing the stability of the flame-retardant heat insulating paints. [Means for solving the problem]

[0006] In a first aspect, the present application provides an environmentally friendly flame-retardant heat-insulating coating material, which adopts the following technical solutions:

[0007] The environmentally friendly fire-retardant heat-insulating paint is manufactured from the following weight percentages of raw materials: Styrene acrylic emulsion 8~15% Adhesion promoter 10-18% Insulation 10~20% Flame retardant 20~30% Wetting and dispersing agent 2-5% Viscosity modifier 3~6% Other additives 4~9% Water remaining

[0008] By adopting the above technical solution, the styrene acrylic emulsion has relatively high temperature resistance, water resistance and coating film adhesion stability, and can be blended with an adhesion promoter, which has excellent coexistence stability, improving the adhesion of the produced environmentally friendly flame-retardant heat-insulating coating material and reducing the likelihood of cracking and peeling off; the heat-insulating agent has the effects of heat insulation and heat preservation, and the flame retardant has the effect of flame retardancy; the wetting and dispersing agent and viscosity modifier make the heat-insulating agent and flame retardant uniformly dispersed throughout the system, further improving the flame-retardant and heat-insulating performance of the produced environmentally friendly flame-retardant heat-insulating coating material; and reducing the problem of peeling and cracking caused by adding a large amount of flame retardant after the environmentally friendly flame-retardant heat-insulating coating material is formed, further improving the adhesion stability of the coating film of the environmentally friendly flame-retardant heat-insulating coating material; the environmentally friendly flame-retardant heat-insulating coating material produced in this application is applicable to the exterior walls of buildings, has relatively high environmental friendliness, flame retardancy, heat insulation and crack resistance performance, will not burn when exposed to fire, has relatively high stability in use and improves the safety of buildings.

[0009] Preferably, the adhesion promoter is composed of 2-amino-2-methyl-1-propanol and silica sol, and the weight ratio of the 2-amino-2-methyl-1-propanol to the silica sol is 1:(12-14).

[0010] By adopting the above technical solution, silica sol has the characteristics of strong adhesion, high temperature resistance and flame retardancy, and 2-amino-2-methyl-1-propanol has relatively high dispersion stability compared to silica sol, and when 2-amino-2-methyl-1-propanol and silica sol are used as adhesion promoters in a suitable ratio, a relatively good synergistic effect can be generated with styrene acrylic emulsion, forming a uniformly dispersed emulsion system, which improves the adhesion stability of the produced environmentally friendly flame-retardant heat-insulating coating material for building materials, reduces the problems of cracking and peeling, and also improves the effects of flame retardancy and heat insulation.

[0011] Preferably, the flame retardant is composed of magnesium hydroxide, hydrous magnesium silicate nanofibers, a phosphorus-based flame retardant, and a nitrogen-based flame retardant, and the weight ratio of the magnesium hydroxide, the hydrous magnesium silicate nanofibers, the phosphorus-based flame retardant, and the nitrogen-based flame retardant is (3-4):1:(2-3):(0.5-1.5).

[0012] By adopting the above technical solution, when the above flame retardant is blended, a relatively good synergistic effect is generated, which can improve the flame retardancy and heat insulation properties of the produced environmentally friendly flame retardant heat insulating coating, improve the density of the formed coating film, and the coating film will not burn when exposed to fire, and has relatively high low smoke and flame retardancy.

[0013] Preferably, the flame retardant is a modified flame retardant, and the modified flame retardant is made from the following parts by weight of raw materials: 15-20 parts magnesium hydroxide Hydrous magnesium silicate nanofiber 5 parts Phosphorus flame retardant 10-15 parts Nitrogen-based flame retardant 2.5 to 7.5 parts Allyl glycidyl ether 0.75 to 1.7 parts γ-aminopropyltriethoxysilane 0.21 to 0.75 parts Polyethylene glycol dioleate 0.21 to 0.56 parts

[0014] Preferably, the modified flame retardant is produced by the following steps: magnesium hydroxide, hydrous magnesium silicate nanofibers, a phosphorus-based flame retardant, and a nitrogen-based flame retardant are added to a stirrer according to the weight ratio of the flame retardants, and 0.75 to 1.7 parts of allyl glycidyl ether, 0.21 to 0.75 parts of γ-aminopropyltriethoxysilane, and 0.21 to 0.56 parts of polyethylene glycol dioleate are added, and the mixture is stirred at a temperature of 20 to 35°C for 30 to 60 minutes to produce the modified flame retardant.

[0015] By adopting the above technical solutions, the amount of flame retardant used in the environmentally friendly flame-retardant heat-insulating coating is large. Although the wetting and dispersing agent and viscosity modifier can disperse the flame retardant, some of the flame retardant may not be completely dispersed, which will also reduce the flame-retardant stability of the coating film. After the coating film dries, some areas will have unstable adhesion. Therefore, in order to further improve the dispersion effect of the flame retardant in the system, the flame retardant is pretreated.

[0016] In this application, allyl glycidyl ether, γ-aminopropyltriethoxysilane, and polyethylene glycol dioleate are used to surface treat the flame retardant, of which allyl glycidyl ether has a flexible hydrophilic ether segment and a hydrophobic epoxy group and vinyl segment. The flame retardant is stably grafted with the silane coupling agent through the action of allyl glycidyl ether, improving the compatibility of the flame retardant in the coating material and allowing the flame retardant to be uniformly dispersed in the molecular entanglement structure formed by the silane coupling agent and allyl glycidyl ether. The polyethylene glycol dioleate has good lubrication and dispersion stability, further improving the dispersion uniformity and stability of the flame retardant. The modified flame retardant thus prepared has relatively high dispersibility and can produce a relatively good synergistic effect with the viscosity modifier and the wetting and dispersing agent, and also improves the dispersibility of the heat insulating agent. The environmentally friendly flame retardant and heat insulating coating thus prepared has relatively high flame retardancy, heat insulation, and adhesion stability, and is not prone to cracking or peeling.

[0017] Preferably, the heat insulating agent is composed of aerogel and hollow glass beads, and the weight ratio of the aerogel to the hollow glass beads is 1:(6 to 8).

[0018] By adopting the above technical solution, aerogel has a relatively good heat insulation and heat retention effect. However, if aerogel is used alone as a heat insulating agent, the produced environmentally friendly flame-retardant heat insulating paint is relatively expensive, and when the coating thickness is relatively thick, it is prone to cracking. Hollow glass beads have the effects of light weight, low thermal conductivity, and high compressive strength. When blended with aerogel, they can improve the density of the coating film and reduce the problem of the coating film being prone to cracking. In addition, the joint action of the wetting and dispersing agent and viscosity modifier allows them to disperse uniformly with the flame retardant, so the produced environmentally friendly flame-retardant heat insulating paint has relatively good adhesion and crack resistance.

[0019] Preferably, the wetting and dispersing agent is composed of a quaternary ammonium salt wetting and dispersing agent and a nonionic wetting and dispersing agent, and the weight ratio of the quaternary ammonium salt wetting and dispersing agent to the nonionic wetting and dispersing agent is 1:(3 to 5).

[0020] By adopting the above technical solutions, the quaternary ammonium salt wetting and dispersing agent has a relatively high adsorption performance for heat insulating agents and flame retardants, and can increase the intermolecular spacing of fillers such as flame retardants and heat insulating agents, reducing the occurrence of aggregation; the nonionic wetting agent has a relatively high wetting and dispersing ability, and can further reduce the surface energy of flame retardants and heat insulating agents, creating a relatively good synergistic effect, further improving the dispersing performance in the flame retardant and heat insulating agent system, and improving the coating performance of the environmentally friendly flame retardant heat insulating paint.

[0021] Preferably, the viscosity modifier is one or a combination of magnesium lithium silicate, magnesium aluminum silicate.

[0022] By adopting the above technical solution, the viscosity modifier has relatively high ion resistance, and can form a dispersion system with a certain viscosity when dissolved in water, and can uniformly disperse and suspend with the flame retardant, heat insulating agent, adhesion promoter and styrene acrylic emulsion, thereby improving the system stability of the produced environmentally friendly flame retardant heat insulating coating, and further improving the overall performance of the environmentally friendly flame retardant heat insulating coating.

[0023] Preferably, the other auxiliary agents are composed of an antifreeze agent, a silicone water repellent agent, a preservative, and an antifoaming agent, and the weight ratio of the antifreeze agent, the silicone water repellent agent, the preservative, and the antifoaming agent is (0.8-1):1:(0.1-0.3):(0.2-0.4).

[0024] By adopting the above technical solutions, the antifreeze agent can improve the antifreeze performance of the environmentally friendly flame-retardant heat-insulating coating and reduce the occurrence of peeling and cracking; the silicone water repellent agent can improve the water resistance and durability of the environmentally friendly flame-retardant heat-insulating coating; the defoaming agent can improve the coating film stability of the environmentally friendly flame-retardant heat-insulating coating and reduce the occurrence of uneven coating; and the preservative can reduce the microbial content in the environmentally friendly flame-retardant heat-insulating coating and reduce the occurrence of mold and deterioration in the coating film, and the above auxiliary agents are an essential part of the environmentally friendly flame-retardant heat-insulating coating.

[0025] In a second aspect, the present application provides a method for producing an environmentally friendly flame-retardant heat-insulating coating material, which adopts the following technical solutions:

[0026] How to manufacture environmentally friendly flame-retardant heat-insulating paint Step S1: adding a viscosity modifier to water and stirring uniformly to prepare a mixed liquid; Step S2 of adding an adhesion promoter and a wetting and dispersing agent to the mixed liquid and stirring uniformly to prepare a dispersion; Step S3 of adding a flame retardant to the dispersion and stirring uniformly to prepare a flame retardant dispersion; and step S4 of adding styrene acrylic emulsion, heat insulating agent and other auxiliaries to the flame retardant dispersion and stirring uniformly to produce an environmentally friendly flame retardant heat insulating coating material.

[0027] By adopting the above technical solution, firstly, a viscosity modifier is dissolved in water to form a mixture with a certain viscosity, then an adhesion promoter and a wetting and dispersing agent are added to the mixture to prepare a dispersion with relatively high dispersion, wetting and suspension stability, then a flame retardant is added to the dispersion to stably disperse the flame retardant and form a uniformly dispersed flame retardant dispersion, and under the joint action of the flame retardant, wetting and dispersing agent and viscosity modifier, a styrene-acrylic emulsion, a heat insulating agent and other auxiliaries are added to uniformly disperse the styrene-acrylic emulsion, a heat insulating agent and other auxiliaries, thereby producing a system with a uniform dispersion and stable performance, an environmentally friendly flame retardant heat insulating coating.

[0028] Preferably, the stirring speed in step S3 is 800 to 1500 r / min and the stirring time is 20 to 40 minutes, and the stirring speed in step S4 is 200 to 600 r / min and the stirring time is 40 to 90 minutes.

[0029] By adopting the above technical solution, the flame retardant can be stably dispersed under high-speed stirring, and then the styrene-acrylic emulsion and heat insulating agent can be uniformly dispersed in the flame retardant dispersion system under low-speed stirring. By appropriately controlling the stirring speed and stirring time, it is easy to produce an environmentally friendly flame retardant heat insulating coating with a uniformly dispersed system. [Effects of the Invention]

[0030] As described above, the present application can achieve at least one of the following beneficial effects.

[0031] 1. The environmentally friendly flame-retardant heat-insulating paint of the present application is formulated with styrene-acrylic emulsion and adhesion promoter, and the flame retardant and heat-insulating agent are uniformly dispersed through the combined action of viscosity modifier and wetting / dispersing agent. The environmentally friendly flame-retardant heat-insulating paint produced in this way has relatively high environmental friendliness, flame retardancy and heat-insulating performance, and the coating film has high adhesion stability and is less likely to crack or fall off. It is suitable for use on building exterior walls and has high stability in use.

[0032] 2. By pretreating the flame retardant with allyl glycidyl ether, gamma-aminopropyltriethoxysilane and polyethylene glycol dioleate, the modified flame retardant prepared can be dispersed uniformly and stably in the system, and generate a relatively good synergistic effect with the viscosity modifier and wetting and dispersing agent, improving the dispersion uniformity of the heat insulating agent. The environmentally friendly flame retardant heat insulating paint produced in this way has excellent comprehensive performance.

[0033] 3. By using quaternary ammonium salt wetting and dispersing agents and nonionic wetting and dispersing agents as wetting and dispersing agents and magnesium lithium silicate / magnesium aluminum silicate as viscosity modifiers, a relatively good synergistic effect can be created with the modified flame retardant, which further improves the dispersion stability of the modified flame retardant and heat insulating agent, and further improves the performance of the produced environmentally friendly flame-retardant heat insulating coating.

[0034] 4. The manufacturing method of this application is simple and easy to operate. First, viscosity modifier, adhesion promoter and wetting / dispersing agent are added to water and dispersed, then flame retardant is added and dispersed, and finally styrene acrylic emulsion, heat insulating agent and other auxiliary agents are added and dispersed. The produced environmentally friendly flame retardant heat insulating paint has a stable system and excellent coating performance. DETAILED DESCRIPTION OF THE INVENTION

[0035] The present invention will be described in more detail below with reference to examples.

[0036] The following are the origins and specifications of some of the raw materials used in the present application. All of the raw materials used in the manufacturing examples and working examples of the present application can be obtained commercially. The raw materials used in the present application include, but are not limited to, the specific model numbers and manufacturers disclosed below. Any raw materials having the same specification parameters and performance can be used.

[0037] 1. Styrene acrylic emulsion: BATF837A, styrene / acrylic ester copolymer emulsion, mass solid content 49%, viscosity 250~2250cps / 25℃; 2, Silica sol: BESNEW, milky white translucent, pH=8-9, mass solid content 32±2%, particle size 5-20nm, 3. Magnesium hydroxide: 325 mesh, 4. Hydrous magnesium silicate nanofiber: Zhejiang grinding stone, inner diameter 10-20nm, outer diameter 40-70nm, length 200-1000nm, specific surface area 800-900m 2 / g, 5. Phosphorus flame retardant: Hong Taiji, Dongguan City, microencapsulated red phosphorus flame retardant, D100≦20μm, D50≦6μm, red phosphorus content>80%; 6. Nitrogen-based flame retardant: melamine cyanurate, CAS number: 37640-57-6, melamine cyanurate content >99.5%, particle size ≤3μm; 7. Polyethylene glycol dioleate: polyethylene glycol 600 dioleate ester, acid value (mgKOH / g): ≦10, content: ≧99%, HLB value: 10-11, saponification value (mgKOH / g): 85-105, 8. Aerogel: Anwei Nanotechnology KNF-G silica aerogel dispersion paste, thermal conductivity 0.017~0.023W / (m·K), density 0.40~0.60g / cm 3 , solids content 10~30%, 9. Hollow glass beads: Zhengzhou Hollowlite, hollow glass beads HS60, average particle size 16μm. (Example of manufacturing modified flame retardant)

[0038] Manufacturing Example 1 The preparation example discloses a modified flame retardant prepared by the following steps. 1.5 kg of magnesium hydroxide, 0.5 kg of hydrous magnesium silicate nanofiber, 1 kg of phosphorus-based flame retardant, and 0.75 kg of nitrogen-based flame retardant were added to a mixer according to the weight ratio of the flame retardants, and 0.075 kg of allyl glycidyl ether, 0.075 kg of γ-aminopropyltriethoxysilane, and 0.056 kg of polyethylene glycol dioleate were added, and the mixture was stirred at 20°C for 30 minutes to produce a modified flame retardant.

[0039] Manufacturing Examples 2-3 The differences between Production Examples 2 and 3 and Production Example 1 are the amounts of raw materials used and the production conditions, and for details, see Table 1 below.

[0040] Table 1: Raw material amounts and manufacturing conditions for Manufacturing Examples 1 to 3 JPEG2025148144000001.jpg124139

[0041] Comparative Manufacturing Example 1 Comparative Production Example 1 is different from Production Example 1 in that allyl glycidyl ether was replaced with an equal amount of γ-aminopropyltriethoxysilane, and the rest was the same as Production Example 1.

[0042] Comparative Manufacturing Example 2 Comparative Production Example 2 is different from Production Example 1 in that the polyethylene glycol dioleate was replaced with an equal amount of γ-aminopropyltriethoxysilane, and the rest was the same as Production Example 1. (Example)

[0043] Example 1 Example 1 discloses an environmentally friendly fire-retardant heat insulating coating material which is prepared by the following steps: In S1, 0.3 kg of methylhydroxyethyl cellulose as a viscosity modifier was added to 2 kg of water, and the mixture was stirred at a stirring speed of 300 r / min for 20 minutes to prepare a mixed solution. In step S2, 1.8 kg of silica sol as an adhesion promoter and 0.2 kg of a nonionic wetting and dispersing agent were added to the mixture, and the mixture was stirred for 10 minutes at a stirring speed of 200 r / min to prepare a dispersion. In S3, 1.5 kg of magnesium hydroxide and 0.5 kg of a phosphorus-based flame retardant were added to the dispersion as a flame retardant, and the mixture was stirred for 20 minutes at a stirring speed of 800 r / min to prepare a flame-retardant dispersion. In step S4, 0.8 kg of styrene acrylic emulsion, 0.286 kg of aerogel and 1.714 kg of hollow glass beads as heat insulating agents, and 0.342 kg of antifreeze agent, 0.429 kg of silicone water repellent, 0.043 kg of preservative, and 0.086 kg of defoamer as other additives were added to the flame-retardant dispersion, and the mixture was stirred for 40 minutes at a stirring speed of 200 r / min to produce an environmentally friendly flame-retardant heat insulating paint. In this example, the nonionic wetting and dispersing agent is Tego 740W, the antifreeze agent is ethylene glycol, the silicone water repellent is Wacker BS 206, the preservative is methylisothiazoline ketone, MIT-50, and the defoamer is Elementis DAPRO DF 7010 defoamer.

[0044] Examples 2 and 3 Examples 2 and 3 differ from Example 1 in the amounts of raw materials used and the production conditions, and for details, see Table 2 below.

[0045] Table 2: Raw material amounts and manufacturing conditions for Examples 1 to 3 JPEG2025148144000002.jpg247139JPEG2025148144000003.jpg7139

[0046] Example 4 The difference between Example 4 and Example 1 is that the flame retardant used is different. The flame retardant in Example 4 is composed of magnesium hydroxide, hydrous magnesium silicate nanofiber, phosphorus-based flame retardant, and nitrogen-based flame retardant. The amount of magnesium hydroxide used is 0.923 kg, the amount of hydrous magnesium silicate nanofiber used is 0.308 kg, the amount of phosphorus-based flame retardant used is 0.615 kg, and the amount of nitrogen-based flame retardant used is 0.154 kg. Other than that, it is the same as Example 1.

[0047] Example 5 The difference between Example 5 and Example 4 is the ratio of the flame retardant. The flame retardant in Example 5 is composed of magnesium hydroxide, hydrous magnesium silicate nanofiber, phosphorus-based flame retardant, and nitrogen-based flame retardant. The amount of magnesium hydroxide used is 0.842 kg, the amount of hydrous magnesium silicate nanofiber used is 0.21 kg, the amount of phosphorus-based flame retardant used is 0.632 kg, and the amount of nitrogen-based flame retardant used is 0.316 kg. The rest is the same as Example 4.

[0048] Example 6 The difference between Example 6 and Example 4 is the use of a different adhesion promoter. The adhesion promoter in Example 6 is composed of 2-amino-2-methyl-1-propanol and silica sol, with the amount of 2-amino-2-methyl-1-propanol used being 0.138 kg and the amount of silica sol used being 1.662 kg. The rest is the same as in Example 4.

[0049] Example 7 The difference between Example 7 and Example 6 is the ratio of the adhesion promoter. The adhesion promoter in Example 7 is composed of 2-amino-2-methyl-1-propanol and silica sol, and the amount of 2-amino-2-methyl-1-propanol used is 0.12 kg, and the amount of silica sol used is 1.68 kg. The rest is the same as in Example 6.

[0050] Example 8 The difference between Example 8 and Example 7 is the use of a different wetting and dispersing agent. The wetting and dispersing agent in Example 8 is composed of a quaternary ammonium salt wetting and dispersing agent and a nonionic wetting and dispersing agent. The amount of quaternary ammonium salt wetting and dispersing agent used is 0.05 kg, the amount of nonionic wetting and dispersing agent used is 0.15 kg, and the quaternary ammonium salt wetting and dispersing agent is Clariant XW330. The rest is the same as in Example 7.

[0051] Example 9 The difference between Example 9 and Example 8 is the ratio of the wetting and dispersing agent. The wetting and dispersing agent in Example 9 is composed of a quaternary ammonium salt wetting and dispersing agent and a nonionic wetting and dispersing agent. The amount of quaternary ammonium salt wetting and dispersing agent used is 0.033 kg, and the amount of nonionic wetting and dispersing agent used is 0.167 kg. Otherwise, it is the same as Example 8.

[0052] Example 10 The difference between Example 10 and Example 8 is that the viscosity modifier is different. The viscosity modifier in Example 10 is magnesium lithium silicate, and the specifications of the magnesium lithium silicate are 325 mesh and 5% viscosity is 2000 to 2200 mPa·s / 25°C. The rest is the same as Example 8.

[0053] Examples 11 to 15 Examples 11 to 15 differ from Example 10 in that the origin of the flame retardant is different, and specifically see Table 3 below.

[0054] Table 3: Origins of flame retardants in Examples 11 to 15 JPEG2025148144000004.jpg49128 (comparative example)

[0055] Comparative Example 1 Comparative Example 1 differs from Example 10 in that the adhesion promoter is replaced with an equal amount of styrene acrylic emulsion, but otherwise is the same as Example 10.

[0056] Comparative Example 2 Comparative Example 2 is different from Example 10 in that the amount of viscosity modifier used is 0.05 kg and the amount of dispersing and wetting agent used is 0.45 kg, but other than that it is the same as Example 10.

[0057] Comparative Example 3 Comparative Example 3 is different from Example 10 in that the amount of viscosity modifier used is 0.45 kg and the amount of dispersing and wetting agent used is 0.05 kg, but other than that it is the same as Example 10.

[0058] Performance Inspection Test The environmentally friendly flame-retardant heat insulating coating materials produced in Examples 1 to 15 and Comparative Examples 1 to 3 are subjected to performance tests.

[0059] (1) Flame retardancy test: Test panels were manufactured in accordance with 6.3.3.3 Manufacturing method of coating test panels for thermal insulation in GB / T 25261-2018 "Reflective heat insulating coatings for buildings", and then an ignition combustion test was carried out for 30 seconds to observe whether fire occurred or not. The smoke density (SDR, unit: %) was tested in accordance with GB / T 8627-2007 "Test method for smoke density during combustion or decomposition of building materials", and the test data was recorded.

[0060] (2) Thermal conductivity test: The thermal conductivity (unit: W / (m·K)) was tested and recorded according to the test method in GB / T 25261-2018 "Reflective and Heat-Insulating Paints for Architecture."

[0061] (3) Adhesion test: The adhesive strength (unit: MPa) was tested and recorded in accordance with the test method in GB / T 25261-2018 "Reflective and Heat-Insulating Paints for Architecture."

[0062] (4) Crack resistance test: According to the test method in GB / T 25261-2018 "Architectural Reflective Heat Insulation Coatings", the test board coated with environmentally friendly flame-retardant heat insulation coating is left at room temperature for 24 hours, and then observed for cracks. The crack status is checked and recorded. If there are no cracks, it is marked as "normal". The specimens were then cycled a total of three times in accordance with the provisions of JG / T 25-2017. The cycle conditions were immersion in 25°C water for 18 hours, freezing at -20°C for 3 hours, and baking at 50°C for 3 hours. After cycling three times, the specimens were returned to room temperature and observed for chalking, cracks, bubbles, and peeling. The specimens were evaluated and recorded in accordance with GB / T 1766-2008, "Evaluation of deterioration of pigmented paint and varnish coating layers."

[0063] The following are performance test data of the environmentally friendly flame-retardant heat insulating coating materials produced in Examples 1 to 15 and Comparative Examples 1 to 3, and specific details are given in Table 4 below.

[0064] Table 4: Performance test data for Examples 1 to 15 and Comparative Examples 1 to 3 JPEG2025148144000005.jpg225139

[0065] As can be seen from Examples 1 to 3 and Examples 4 to 5, as well as Table 4, by using a flame retardant in an appropriate ratio, the flame retardancy and heat insulating performance of the produced environmentally friendly flame retardant heat insulating coating can be suitably improved, and the adhesive strength of the coating film and the initial cracking state of the coating film can also be suitably improved.

[0066] As can be seen from Examples 4-5, Examples 6-7, Comparative Example 1, and Table 4, the use of the adhesion promoter in a suitable ratio according to the present application can favorably improve the flame retardancy and thermal insulation performance of the produced environmentally friendly flame retardant thermal insulation coating, and can also favorably improve the adhesive strength and initial cracking condition of the coating film. The cracking resistance of the coating film after undergoing a temperature resistance test is also improved. In Comparative Example 1, the environmentally friendly flame retardant thermal insulation coating produced by replacing the adhesion promoter with an equal amount of styrene acrylic emulsion exhibited significantly reduced flame retardancy, thermal insulation performance, and adhesive strength, as well as significantly reduced cracking resistance. This indicates that the adhesion promoter can produce a relatively good synergistic effect with the styrene acrylic emulsion, improving the overall performance of the produced environmentally friendly flame retardant thermal insulation coating.

[0067] As can be seen from Examples 6-7, Examples 8-10, Comparative Examples 2-3, and Table 4, when the wetting and dispersing agent and viscosity modifier are used in the preferred ratios of amounts according to the present application, the dispersion uniformity in the flame retardant and heat insulating agent system can be favorably improved, and the performance of the produced environmentally friendly flame-retardant heat insulating coating is improved. However, when the amount of viscosity modifier is reduced in Comparative Example 2, and when the amount of wetting and dispersing agent is reduced in Comparative Example 3, the overall performance of the produced environmentally friendly flame-retardant heat insulating coating is reduced.

[0068] As can be seen from Examples 10 and 11 to 15, as well as Table 4, modifying the flame retardant can further improve the flame retardancy, thermal conductivity, and adhesive strength of the environmentally friendly flame-retardant heat-insulating coating material.

[0069] The specific examples are merely for the purpose of illustrating the present application and are not intended to limit the present application. After reading this specification, a person skilled in the art may make amendments to the examples as necessary, which do not constitute a creative contribution to the present application, but any such amendments will be protected by patent law as long as they are within the scope of the claims of the present application.

Claims

1. An environmentally friendly, flame-retardant heat-insulating paint characterized by being produced from raw materials with the following weight percentages: Styrene acrylic emulsion 8-15% Adhesion promoter 10-18% Insulation material 10-20% Flame retardant 20-30% Wetting and dispersing agent 2-5% Viscosity modifier 3-6% Other additives: 4-9% Water remaining

2. 2. The environmentally friendly flame-retardant heat insulating coating according to claim 1, wherein the adhesion promoter is composed of 2-amino-2-methyl-1-propanol and silica sol, and the weight ratio of the 2-amino-2-methyl-1-propanol to the silica sol is 1:(12-14).

3. 2. The environmentally friendly flame-retardant heat insulating coating according to claim 1, wherein the flame retardant is composed of magnesium hydroxide, hydrous magnesium silicate nanofibers, a phosphorus-based flame retardant, and a nitrogen-based flame retardant, and the weight ratio of the magnesium hydroxide to the hydrous magnesium silicate nanofibers to the phosphorus-based flame retardant and the nitrogen-based flame retardant is (3-4):1:(2-3):(0.5-1.5).

4. 2. The environmentally friendly flame-retardant heat-insulating coating material according to claim 1, wherein the flame retardant is a modified flame retardant, and the modified flame retardant is prepared from the following weight parts of raw materials: Magnesium hydroxide 15-20 parts Hydrous magnesium silicate nanofiber 5 parts Phosphorus-based flame retardant 10-15 parts Nitrogen-based flame retardant 2.5 to 7.5 parts Allyl glycidyl ether 0.75 to 1.7 parts γ-aminopropyltriethoxysilane 0.21 to 0.75 parts Polyethylene glycol dioleate 0.21 to 0.56 parts

5. 2. The environmentally friendly flame-retardant heat insulating paint according to claim 1, wherein the heat insulating agent is composed of aerogel and hollow glass beads, and the weight ratio of the aerogel to the hollow glass beads is 1:(6-8).

6. 2. The environmentally friendly flame-retardant heat insulating coating according to claim 1, wherein the wetting and dispersing agent is composed of a quaternary ammonium salt wetting and dispersing agent and a nonionic wetting and dispersing agent, and the weight ratio of the quaternary ammonium salt wetting and dispersing agent to the nonionic wetting and dispersing agent is 1:(3-5).

7. 2. The environmentally friendly flame-retardant heat insulating coating of claim 1, wherein the viscosity modifier is one or a combination of magnesium lithium silicate and magnesium aluminum silicate.

8. 2. The environmentally friendly flame-retardant heat insulating coating according to claim 1, wherein the other auxiliary agents are composed of an antifreeze agent, a silicone water repellent agent, a preservative, and a defoaming agent, and the weight ratio of the antifreeze agent, the silicone water repellent agent, the preservative, and the defoaming agent is (0.8-1):1:(0.1-0.3):(0.2-0.4).

9. Step S1: adding a viscosity modifier to water and stirring the mixture until uniform; Step S2: adding an adhesion promoter and a wetting / dispersing agent to the mixture and stirring uniformly to prepare a dispersion; Step S3: adding a flame retardant to the dispersion and stirring uniformly to prepare a flame retardant dispersion; and step S4 of adding a styrene-acrylic emulsion, a heat insulating agent and other auxiliaries to the flame-retardant dispersion, and stirring the mixture uniformly to produce an environmentally friendly flame-retardant heat insulating paint.

10. The method for producing an environmentally friendly flame-retardant heat-insulating coating material according to claim 9, wherein the stirring speed in step S3 is 800 to 1500 r / min and the stirring time is 20 to 40 min, and the stirring speed in step S4 is 200 to 600 r / min and the stirring time is 40 to 90 min.

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