JP7509486B1 - Environmentally friendly flame-retardant heat-insulating paint and its manufacturing method - Google Patents

Abstract

The present invention provides an environmentally friendly flame-retardant heat-insulating paint that has excellent coating film adhesion, is resistant to shedding, and has relatively high flame retardancy, heat insulation, and crack resistance, and a method for producing the same.
[Solution] The flame-retardant heat-insulating paint is manufactured from raw materials consisting of, by weight percentage, 8-15% styrene-acrylic emulsion, 10-18% adhesion promoter, 10-20% heat-insulating agent, 20-30% flame retardant, 2-5% wetting dispersant, 3-6% viscosity modifier, 4-9% other auxiliary agents, and the balance water. The manufacturing method includes, in S1, mixing the viscosity modifier and water to prepare a mixed liquid, in S2, mixing the adhesion promoter and wetting dispersant with the mixed liquid to prepare a dispersion, in S3, mixing the flame retardant and dispersion to prepare a flame-retardant dispersion, and in S4, mixing the styrene-acrylic emulsion, heat-insulating agent, and other auxiliary agents with the flame-retardant dispersion.
[Selection diagram] None

Description

This application relates to the field of environmentally friendly functional coatings for architecture, more specifically, it relates to environmentally friendly flame-retardant heat-insulating coatings and methods for their manufacture.

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

Thermal insulation paint for building walls has excellent insulating and heat-retaining properties, but has low flame retardancy and is prone to burning in the event of a fire, posing a significant risk to human life and safety and likely to cause large economic losses.

To improve the flame retardant performance of heat insulating paint for building walls, as described in the prior art document GB/T25261-2018, it is common to add a flame retardant to the heat insulating paint. Flame retardants are generally powder fillers, and when added to heat insulating paint, the coating performance of the heat insulating paint is likely to decrease, and the coating layer formed by application on the building wall is likely to crack and fall off, reducing the stability of the heat insulating paint when used on the building wall.

This application provides an environmentally friendly flame-retardant heat-insulating paint and a method for producing the same, in order to solve the problem that conventional flame-retardant heat-insulating paint is prone to cracking and falling off during use, reducing the stability of the paint when used.

In a first aspect, the present application provides an environmentally friendly flame-retardant heat insulating paint, which employs the following technical solutions:

The environmentally friendly, flame-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

By adopting the above technical solution, the styrene acrylic emulsion has relatively high temperature resistance, water resistance and coating film adhesion stability, can be blended with an adhesion promoter, has excellent coexistence stability, improves the adhesion of the produced environmentally friendly flame-retardant heat-insulating paint, and reduces the situation where cracking and falling off are likely to occur. The heat-insulating agent has the function of insulation and heat retention, and the flame retardant has the function of flame retardancy. The heat-insulating agent and the flame retardant are uniformly dispersed in the system by the action of the wetting dispersant and viscosity modifier, further improving the flame retardant and heat insulation performance of the produced environmentally friendly flame-retardant heat-insulating paint. In addition, the problem that the environmentally friendly flame-retardant heat-insulating paint is prone to falling off and cracking after it becomes a coating film due to the addition of a large amount of flame retardant is reduced, and the adhesion stability of the coating film of the environmentally friendly flame-retardant heat-insulating paint is further improved. The environmentally friendly flame-retardant heat-insulating paint produced in this application is applied to the exterior walls of buildings, has relatively high environmental friendliness, flame retardancy, heat insulation and crack resistance performance, does not burn when exposed to fire, has relatively high stability in use, and improves the safety of buildings.

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).

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 a relatively high dispersion stability relative to silica sol. 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 uniform dispersion emulsion system, improving the adhesion stability of the manufactured environmentally friendly flame-retardant heat-insulating paint in building materials, reducing the problems of cracking and falling off, and improving the effects of flame retardancy and heat insulation.

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).

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

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:
Magnesium hydroxide 15-20 parts Hydrous magnesium silicate nanofiber 5 parts Phosphorus-based flame retardant 10-15 parts Nitrogen-based flame retardant 2.5-7.5 parts Allyl glycidyl ether 0.75-1.7 parts γ-aminopropyltriethoxysilane 0.21-0.75 parts Polyethylene glycol dioleate 0.21-0.56 parts

Preferably, the modified flame retardant is produced by the following steps: Add magnesium hydroxide, hydrous magnesium silicate nanofiber, phosphorus-based flame retardant and nitrogen-based flame retardant to a stirrer according to the weight ratio of the flame retardants, add 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, and stir for 30 to 60 minutes at a temperature of 20 to 35°C to produce the modified flame retardant.

By adopting the above technical solution, the amount of flame retardant used in the environmentally friendly flame-retardant heat-insulating paint is large, so although the wetting dispersant and viscosity modifier can disperse the flame retardant, some flame retardants may not be completely dispersed, which also reduces the flame retardant stability of the coating film, and after the coating film dries, some areas may have unstable adhesion. Therefore, in order to further improve the dispersion effect of the flame retardant in the system, the flame retardant is pretreated.

In the present application, allyl glycidyl ether, γ-aminopropyl triethoxysilane and polyethylene glycol dioleate are used to perform surface treatment on the flame retardant, among which allyl glycidyl ether has a flexible hydrophilic ether segment and a hydrophobic epoxy group and a vinyl segment, the flame retardant is stably grafted with the silane coupling agent by the action of allyl glycidyl ether, improving the compatibility of the flame retardant in the paint, and the flame retardant is uniformly dispersed in the molecular entanglement structure formed by the silane coupling agent and allyl glycidyl ether, the polyethylene glycol dioleate has suitable lubrication and dispersion stability, and can further improve the dispersion uniformity and stability of the flame retardant, the modified flame retardant thus manufactured has relatively high dispersibility, can generate a relatively good synergistic effect with the viscosity modifier and the wetting dispersant, and also improves the dispersibility of the heat insulating agent, and the environmentally friendly flame retardant heat insulating paint thus manufactured has relatively high flame retardancy, heat insulation and adhesion stability, and is not easily cracked or dropped off.

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:(6-8).

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 insulation agent, the cost of the produced environmentally friendly flame-retardant heat insulation paint is relatively high, and when the coating film is relatively thick, it is prone to cracking. Hollow glass beads have the effects of being light in mass, low in thermal conductivity, and high in compressive strength. When mixed with aerogel, it can improve the density of the coating film, reducing the problem of the coating film being prone to cracking. In addition, the joint action of the wetting dispersant and viscosity modifier allows the flame retardant to be dispersed evenly, and the produced environmentally friendly flame-retardant heat insulation paint has relatively high adhesion and crack resistance.

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:(3-5).

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 distance between the molecules of fillers such as flame retardants and heat insulating agents, reducing the occurrence of aggregation, while the nonionic wetting agent has a relatively high wetting and dispersing property, and can further reduce the surface energy of the flame retardants and heat insulating agents, creating a relatively good synergistic effect between the two, further improving the dispersion performance in the flame retardant and heat insulating agent system, and improving the coating performance of the environmentally friendly flame retardant heat insulating paint.

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

By adopting the above technical solution, the viscosity modifier has relatively high ion resistance, and when dissolved in water, it can form a dispersion system with a certain viscosity, 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 paint, and further improving the overall performance of the environmentally friendly flame-retardant heat insulating paint.

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).

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

In a second aspect, the present application provides a method for producing an environmentally friendly flame-retardant heat-insulating paint, which employs the following technical solutions:

The method for producing an environmentally friendly flame-retardant heat-insulating paint includes steps S1 of adding a viscosity modifier to water and uniformly stirring the mixture to prepare a mixed solution;
Step S2 of adding an adhesion promoter and a wetting and dispersing agent to the mixture 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 auxiliary agents to the flame-retardant dispersion and stirring uniformly to produce an environmentally friendly flame-retardant heat insulating paint.

By adopting the above technical solution, the viscosity modifier is first dissolved in water to form a mixture with a certain viscosity, then the adhesion promoter and the wetting and dispersing agent are added to the mixture to prepare a dispersion with relatively high dispersion, wetting and suspension stability, then the flame retardant is added to the dispersion to stably disperse the flame retardant and form a uniformly dispersed flame retardant dispersion, and the styrene acrylic emulsion, heat insulating agent and other auxiliary agents are added through the joint action of the flame retardant, wetting and dispersing agent and the viscosity modifier to uniformly disperse the styrene acrylic emulsion, heat insulating agent and other auxiliary agents, thus producing an environmentally friendly flame retardant heat insulating paint with a uniformly dispersed system and stable performance.

Preferably, 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.

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 paint in which the system is uniformly dispersed.

As described above, the present application can achieve at least one of the following beneficial effects:

1. The environmentally friendly flame-retardant heat-insulating paint of the present application is formulated with a styrene-acrylic emulsion and an adhesion promoter, and the flame retardant and heat-insulating agent are uniformly dispersed through the joint action of a viscosity modifier and a wetting and 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, high adhesion stability of the coating film, and is less likely to crack or fall off. It is suitable for use on the exterior walls of buildings and has high stability in use.

2. By pretreating the flame retardant with allyl glycidyl ether, gamma-aminopropyl triethoxysilane and polyethylene glycol dioleate, the modified flame retardant prepared can be uniformly and stably dispersed in the system, and produces a relatively good synergistic effect with the viscosity modifier and the wetting and dispersing agent, improving the uniform dispersion of the heat insulating agent, and the environmentally friendly flame retardant heat insulating paint produced in this way has high overall performance.

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

4. The manufacturing method of the present application is simple and easy to operate. First, the viscosity modifier, adhesion promoter and wetting and dispersing agent are added to water and dispersed, then the flame retardant is added and dispersed, and finally the styrene acrylic emulsion, heat insulating agent and other auxiliary agents are added and dispersed. The resulting environmentally friendly flame retardant heat insulating paint has a stable system and excellent coating film performance.

The present application will be explained in more detail below with reference to the examples.

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

1. Styrene acrylic emulsion: BATF837A, styrene/acrylic acid ester copolymer emulsion, mass solid content 49%, viscosity 250-2250 cps/25°C;
2. Silica sol: BESNEW, milky white translucent, pH=8-9, mass solid content 32±2%, particle size 5-20 nm;
3. Magnesium hydroxide: 325 mesh,
4. Hydrous magnesium silicate nanofiber: Zhejiang Grindstone, inner diameter 10-20 nm, outer diameter 40-70 nm, length 200-1000 nm, specific surface area 800-900 m ² /g;
5. Phosphorus-based 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 ≦3 μm,
7. Polyethylene glycol dioleate: polyethylene glycol 600 dioleate, acid value (mg KOH/g): ≦10, content: ≧99%, HLB value: 10-11, saponification value (mg KOH/g): 85-105,
8. Aerogel: Anhui Techno Nanotechnology KNF-G silica aerogel dispersion paste, thermal conductivity 0.017-0.023 W/(m·K), density 0.40-0.60 g/cm ³ , solid content 10-30%;
9. Hollow glass beads: Zhengzhou Hollowlite, hollow glass beads HS60, average particle size 16 μm.
(Example of manufacturing modified flame retardant)

Production 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 stirrer 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 stirred at a temperature of 20°C for 30 minutes to produce a modified flame retardant.

Production Examples 2 to 3
The differences between Production Examples 2 and 3 and Production Example 1 are in the amounts of raw materials used and the production conditions. See Table 1 below for details.

Table 1. Raw material amounts and manufacturing conditions for Manufacturing Examples 1 to 3

Comparative Production Example 1
Comparative Production Example 1 is different from Example 1 in that allyl glycidyl ether is replaced with an equal amount of γ-aminopropyltriethoxysilane, and otherwise the same as Example 1.

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

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 was added as a viscosity modifier to 2 kg of water, and the mixture was stirred for 20 minutes at a stirring speed of 300 r/min to prepare a mixed liquid.
In 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 are added to the dispersion as a flame retardant, and the dispersion is stirred for 20 minutes at a stirring speed of 800 r/min to prepare a flame-retardant dispersion;
In 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, 0.342 kg of antifreeze agent as other auxiliary agents, 0.429 kg of silicone water repellent, 0.043 kg of preservative and 0.086 kg of defoamer are added to the flame retardant dispersion, and the mixture is stirred for 40 minutes at a stirring speed of 200 r/min to produce an environmentally friendly flame retardant heat insulating paint;
The nonionic wetting and dispersing agent in this example is Tego 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.

Examples 2 to 3
The differences between Examples 2 and 3 and Example 1 are the amounts of raw materials used and the production conditions. See Table 2 below for details.

Table 2: Raw material amounts and manufacturing conditions for Examples 1 to 3

Example 4
The difference between Example 4 and Example 1 is that the flame retardant is different. The flame retardant in Example 4 is composed of magnesium hydroxide, hydrous magnesium silicate nanofiber, a phosphorus-based flame retardant, and a 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. The rest is the same as Example 1.

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.

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

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, 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.

Example 8
The difference between Example 8 and Example 7 is that the wetting dispersant is different. The wetting dispersant in Example 8 is composed of a quaternary ammonium salt wetting dispersant and a nonionic wetting dispersant. The amount of the quaternary ammonium salt wetting dispersant used is 0.05 kg, the amount of the nonionic wetting dispersant used is 0.15 kg, and the quaternary ammonium salt wetting dispersant is Clariant XW330. The rest is the same as in Example 7.

Example 9
The difference between Example 9 and Example 8 is the ratio of wetting dispersants. The wetting dispersant in Example 9 is composed of a quaternary ammonium salt wetting dispersant and a nonionic wetting dispersant. The amount of quaternary ammonium salt wetting dispersant used is 0.033 kg, and the amount of nonionic wetting dispersant used is 0.167 kg. The rest is the same as Example 8.

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

Examples 11 to 15
The difference between Examples 11 to 15 and Example 10 is that the origin of the flame retardant is different. For details, see Table 3 below.

Table 3: Origin of the flame retardants in Examples 11 to 15
Comparative Example

Comparative Example 1
Comparative Example 1 differs from Example 10 in that the adhesion promoter was replaced with an equal amount of styrene acrylic emulsion, but otherwise is similar to Example 10.

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 otherwise is the same as Example 10.

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 wetting agent used is 0.05 kg, but otherwise is similar to Example 10.

Performance Test Hereinafter, the environmentally friendly flame-retardant heat insulating coating materials prepared in Examples 1 to 15 and Comparative Examples 1 to 3 are subjected to performance tests.

(1) Flame retardancy test:
The test plate was manufactured according to the method for manufacturing the coating test plate in 6.3.3.3 Thermal insulation in GB/T 25261-2018 "Reflective heat insulating coating for architecture", and then an ignition combustion test was carried out for 30 seconds to observe whether a fire occurred or not, and the smoke density (SDR, unit: %) was tested according to GB/T 8627-2007 "Test method for smoke density of combustion or decomposition of building materials", and the test data was tested and recorded.

(2) Thermal conductivity test:
The thermal conductivity (unit: W/(m·K)) was tested and recorded with reference to the test method in GB/T 25261-2018 "Reflective and Insulating Paint for Architecture."

(3) Adhesion test:
The adhesive strength (unit: MPa) was tested and recorded with reference to the test method in GB/T 25261-2018 "Reflective and Insulating Paint for Architecture."

(4) Crack resistance test:
Refer to the test method in GB/T 25261-2018 "Reflective heat insulating paint for architecture", leave the test plate coated with environmentally friendly flame retardant heat insulating paint at room temperature for 24 hours, observe whether there are cracks, test and record the cracking situation, if there are no cracks, mark "normal",
Then, in accordance with the provisions of JG/T 25-2017, the specimens were cycled a total of three times, the cycle conditions being immersed in water at 25°C for 18 hours, frozen at -20°C for 3 hours, and baked at 50°C for 3 hours. After the three cycles and tests, the specimens were returned to room temperature and observed for chalking, cracks, bubbles, and peeling, which were evaluated and recorded in accordance with GB/T 1766-2008 "Evaluation of deterioration of pigmented paint and varnish coating layers."

The following are performance test data for the environmentally friendly flame-retardant heat insulating paints produced in Examples 1 to 15 and Comparative Examples 1 to 3. For details, see Table 4 below.

Table 4: Performance test data for Examples 1 to 15 and Comparative Examples 1 to 3

As can be seen from Examples 1 to 3 and Examples 4 to 5, as well as Table 4, the use of a suitable ratio of flame retardant can favorably improve the flame retardancy and heat insulating performance of the produced environmentally friendly flame retardant heat insulating paint, and can also favorably improve the adhesive strength of the coating film and the initial cracking condition of the coating film.

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 heat insulating performance of the produced environmentally friendly flame retardant heat insulating paint, and can also favorably improve the adhesive strength and initial cracking condition of the paint film, and improve the crack resistance of the paint film after the temperature resistance test. In Comparative Example 1, the environmentally friendly flame retardant heat insulating paint produced by replacing the adhesion promoter with an equal amount of styrene acrylic emulsion has significantly reduced flame retardancy, heat insulating performance, and adhesive strength, and also significantly reduced crack resistance, which indicates that the adhesion promoter can generate a relatively good synergistic effect with the styrene acrylic emulsion, improving the overall performance of the produced environmentally friendly flame retardant heat insulating paint.

As can be seen from Examples 6-7, Examples 8-10, Comparative Examples 2-3, and Table 4, the use of the wetting dispersant and viscosity modifier in the preferred usage ratio of the present application can favorably improve the dispersion uniformity in the flame retardant and heat insulating agent system, and the performance of the produced environmentally friendly flame retardant heat insulating paint is improved, while the overall performance of the environmentally friendly flame retardant heat insulating paint produced by reducing the usage amount of the viscosity modifier in Comparative Example 2 and by reducing the usage amount of the wetting dispersant in Comparative Example 3 is both reduced.

As can be seen from Example 10 and Examples 11 to 15, as well as Table 4, modifying the flame retardant can further improve the flame retardant performance, thermal conductivity, and adhesive strength of the environmentally friendly flame-retardant heat-insulating paint.

These 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, if necessary, make amendments to the present examples that do not make a creative contribution to the present application, but any amendments that fall within the scope of the claims of the present application are protected by the Patent Law.

Claims (3)

in water by weight percentage
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%
A flame-retardant heat-insulating paint containing
The styrene acrylic emulsion has a solids content of 49%;
the adhesion promoter is a silica sol having a solid content of 32±2%, or the adhesion promoter is composed of 2-amino-2-methyl-1-propanol and the silica sol, and the weight ratio of the 2-amino-2-methyl-1-propanol to the silica sol is 1:(12-14);
The heat insulating agent is composed of aerogel and hollow glass beads, the weight ratio of the aerogel to the hollow glass beads is 1:(6-8), and the solid content of the aerogel is 10-30%;
The flame retardant is composed of magnesium hydroxide and a phosphorus-based flame retardant, and the weight ratio of the magnesium hydroxide to the phosphorus-based flame retardant is 1.5:0.5 to 1:1.5; or 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 to the nitrogen-based flame retardant is (3 to 4):1:(2 to 3):(0.5 to 1.5); or the flame retardant is a modified flame retardant, and the modified flame retardant is, in parts by weight,
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
It is composed of
The wetting and dispersing agent is a nonionic wetting and dispersing agent, or 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);
The viscosity modifier is methylhydroxyethyl cellulose or lithium magnesium silicate;
The other auxiliary agents are composed of an antifreeze agent, a silicone water repellent agent, a preservative agent, and an antifoaming agent, and the weight ratio of the antifreeze agent, the silicone water repellent agent, the preservative agent, and the antifoaming agent is (0.8-1):1:(0.1-0.3):(0.2-0.4).
An environmentally friendly, flame-retardant heat-insulating paint. Step S1 of 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 mixture 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, adding styrene-acrylic emulsion, heat insulating agent and other auxiliary agents to the flame-retardant dispersion, and stirring uniformly to produce an environmentally friendly flame-retardant heat insulating paint. The manufacturing method of the environmentally friendly flame-retardant heat-insulating coating material according to claim 2, characterized in that in step S3, the stirring speed is 800-1500 r/min, and the stirring time is 20-40 min, and in step S4, the stirring speed is 200-600 r/min, and the stirring time is 40-90 min.