KR100919968B1 - Expandable fireproof coating composition - Google Patents

Abstract

PURPOSE: An expandable fireproof coating composition is provided to improve foaming density, foaming rate, heat resistance and heat insulation and to block the diffusion of fire. CONSTITUTION: An expandable fireproof coating composition comprises 40~70 weight% silicate; 1~15 weight% control agent with molar ratio SiO2/M2O of silicate, wherein the control agent is selected from an alkali metal compound or amorphous silica, wherein M is the metal belonging to 1A group in the periodic table; 0.2~20 weight% single or two kinds or more blowing agent selected from the group consisting of calcium inorganic material, expandable pearlite and expandable vetmiculite; 0.5~10 weight% reinforcing material; 0.2~15 weight% hydroxide additive; and 0.5~30 weight% solvent.

Description

Foamable fireproof coating composition {EXPANDABLE FIREPROOF COATING COMPOSITION}

The present invention is based on an inorganic resin material in which the molar ratio of silicate is adjusted using a molar ratio adjusting agent selected from alkali metal compounds or amorphous silica, and includes a specific foaming aid, a reinforcing agent, a hydroxide additive, and a solvent. It relates to a foamable fireproof coating composition exhibiting.

Fireproof cladding is a cladding that provides time to extinguish a fire by protecting a building, etc. from fire, and blocking or delaying the access of high temperature heat to steel when a fire occurs, or providing a time to rescue lives. In addition, the refractory structure refers to a structure in which the main structural part of the building has a fire resistance performance that can withstand high temperatures in the event of a fire and can be reused by simple repairs after a fire.

On the other hand, the low carbon steel used in the building steel structure has a critical temperature of about 540 ℃, the strength is usually reduced to about 60% above the critical temperature. Therefore, for the steel structure, in order to prevent the fall of the strength of the steel frame and the damage caused by human life in the event of fire of the building, the steel fireproof coating is performed. Also in the case of wooden houses, it is important that there should be no flame propagation on the back side for a certain period of time.

In general, a variety of basic performances are required for the foamed fireproof cladding to function properly to protect steel structures or wood structures in case of fire. First, in order to have sufficient thermal insulation, foaming is smooth and the thickness of the foamed coating film must be higher than a certain level. When the foam thickness is thin, sufficient heat insulation cannot be expressed. Second, the density of the foam layer must be high enough for effective insulation. Even if the foam layer is thick, if the foam layer has a low density, it is impossible to effectively prevent the penetration of heat from the outside. Third, uniform foaming should occur without foaming due to excessive foaming or shrinkage during foaming. When cracks are generated in the foamed coating film, heat is introduced into the steel frame or wood through the crack generating portion, thereby preventing the required fire resistance. Most importantly, there should be no change in the film due to shrinkage expansion for a long time after the construction of steel frame or wood of the building.

On the other hand, the general foamable refractory coating composition is composed mainly of a composition using an organic polymer, ammonium polyphosphate and polyhydric alcohol. The fireproof coating composition of this type has a problem in that ammonia gas, which is a toxic gas upon foaming, is generated as a by-product, and the foaming layer is formed of a carbonized layer, so that the foaming layer can be easily broken by hot air during a fire. That is, since there is a limit in fire resistance in this way, the product used and the use are limited.

In addition to such an organic fireproof coating, there is also an inorganic fireproof coating having a silicate as the main binder. This can solve the problems of the organic type fireproof coating, but the thickness of the coating film becomes too thick compared to the organic type fireproof coating, and many problems such as peeling and dropping of the coating may occur due to cracks in the coating during drying and shrinkage. Can be.

As a specific example, Korean Patent Laid-Open No. 1989-0010138 discloses a technique for a foamable refractory inorganic fire retardant having a liquid metal silicate as a main binder. However, in the case of such a composition, although foam insulation is very excellent, there is a limit in heat resistance of the metal silicate used, and there is a problem in that the foam coating layer melts and flows down under a high temperature of about 600 ° C. or more.

In addition, Japanese Patent Laid-Open No. 5-86310 discloses a coating composition for a foamable fireproof coating material using ammonium polyphosphate as a blowing agent, melamine as a carbonizing agent, and modified epoxy as a binder. This type of coating material is a type of coating material that protects the material from heat by causing the coating composition to receive heat to form a carbon layer by chemical reaction around 400 ° C. Such a coating material has excellent foaming performance, but not only emits a large amount of ammonia gas as the coating film is foamed, but the foam layer itself is formed of a very weak carbonized layer, so the foam layer is easily broken by hot air in case of fire.

In addition, the Republic of Korea Patent Publication No. 2005-0070809 discloses a foamed refractory paint composition comprising a molar ratio control agent, a reinforcing agent, a sieving pigment, expandable graphite or encapsulated foaming aid, additives in the silicate. The refractory coating composition is excellent in heat resistance by using a reinforcing agent, additives and the like while controlling the molar ratio of the silicate. However, the composition uses the expandable graphite as a foaming aid to block the flame, which also has a problem that the carbon layer formed by carbon dioxide is weak so that the foam layer is easily destroyed by the hot air and thus the flame penetrates again between the damaged foam layers. have. In addition, the composition has a problem that the carbon dioxide produced by pyrolysis does not remain in the foam layer and is released into the atmosphere, thereby degrading the propagation of the flame.

Meanwhile, the foaming / expansion adiabatic mechanism of a general silicate fireproof coating is as follows. In other words, the silicate used as a binder has a water content of 40 to 70% by weight, and these water content expands and expands inside the coating film to form various types of cells when subjected to a temperature of 70 to 130 ° C or higher, thereby providing an insulating effect. Will be displayed. However, these cells are lowered in density by sieving pigments and other fillers used in the production of coating materials, and the foamed and expanded coating film is melted at a high temperature of 600 ° C. or higher due to lack of heat resistance. Therefore, in order to maintain excellent heat resistance for a long time under high temperature, it is necessary to form a thick coating layer of several thousand microns or more.

Therefore, an object of the present invention is to increase the density of the cells described above, can exhibit excellent fire resistance and thermal insulation performance with a thin film even at a high temperature of more than 600 ℃, prevents the release of carbon dioxide generated by pyrolysis into the atmosphere of fire It is to provide a foamed fireproof coating composition that can effectively block the propagation of the flame by blocking the three elements, such as oxygen and heat.

In order to achieve the above object, the present invention is 40 to 70% by weight silicate; A mole ratio of silicate selected from alkali metal compounds or amorphous silica, 1 to 15% by weight of a regulator of SiO ₂ / M ₂ O, wherein M is a metal belonging to group 1A of the periodic table; 0.2 to 20 wt% of single or two or more foaming aids selected from calcium-based inorganic materials, expandable perlite and expandable vermiculite; 0.5-10% by weight of stiffeners; 0.2-15 wt% hydroxide additive; And it provides a foamed fireproof coating composition comprising 0.5 to 30% by weight solvent.

In one embodiment, the expandable pearlite and expandable vermiculite has an average particle diameter of 0.1 ~ 2.0mm.

In one embodiment, the foaming aid is at least two selected from calcium-based inorganic materials, expandable pearlite and expandable vermiculite.

In one embodiment, the calcium-based inorganic material is one or two or more selected from limestone, calcium carbonate and calcite.

In one embodiment, the silicate is one or two or more selected from sodium silicate, potassium silicate and lithium silicate.

In one embodiment, the modifier is used such that the molar ratio SiO ₂ / M ₂ O of the silicate is 1.9-4.0.

In one embodiment, the modulator is one or two or more selected from NaOH, KOH, white carbon, and silica sol.

In one embodiment, the reinforcing material is one or two or more selected from glass fiber, ceramic fiber and rock wool, in which the length of the fiber is 3 mm or less and the shot in the fiber is removed.

In one embodiment, the hydroxide additive is one or two or more selected from magnesium hydroxide, calcium hydroxide and aluminum hydroxide having an average particle diameter of 0.5 ~ 10㎛.

The foamable refractory coating composition of the present invention can control the molar ratio of the silicate by using a molar ratio adjusting agent in the silicate-based compound, and at the same time, using a foaming aid selected from calcium-based inorganic materials, expandable perlite and vetmiculite. As a result, the foaming density, foaming rate and thermal shielding performance can be improved. In addition, the composition of the present invention can improve the dry strength and heat resistance of the coating film and the strength of the foam layer by using a reinforcing material, and further improve the heat resistance by using a hydroxide additive. As a result, the composition of the present invention is excellent in heat resistance and heat insulation, and excellent foaming efficiency and foam density, etc., so that it is suitable as a fireproof coating material for reinforcing beams and columns and wooden beams and columns of buildings.

Hereinafter, the present invention will be described in detail.

The foamable refractory coating composition according to the present invention is based on an inorganic resin material in which the molar ratio of silicate is adjusted using a molar ratio adjusting agent selected from alkali metal compounds or amorphous silica, and the foaming ratio, foam density and flame of the foam layer It includes a foaming aid to increase the barrier performance, a reinforcing material for improving the dry strength, heat resistance and foam strength of the coating film, and additives and solvents for improving the appearance and heat resistance of the coating film.

In order for the foamable refractory coating composition to exhibit high foaming performance, in particular, the silicate resin needs to expand well, which is possible by controlling the molar ratio of the silicate by utilizing a molar ratio controlling agent such as amorphous silica or an alkali metal compound. However, if the molar ratio of silicate is too high, the heat resistance is excellent, but the foaming rate is low. If the molar ratio is too low, the foaming rate is high but the heat resistance is low.

Accordingly, in the present invention, by controlling the molar ratio of silicate by amorphous silica or alkali metal compound, and using calcium-based inorganic material, expandable pearlite and / or expandable vermiculite of a certain average particle size as foaming aid, the foaming ratio of the coating film is improved. The present invention achieves the object of the present invention by increasing the foam density inside the foam layer and at the same time preventing the emission of carbon dioxide generated by pyrolysis to increase the blocking performance of flame propagation.

The silicate used in the present invention is a compound represented by M ₂ O.nSiO ₂ .xH ₂ O, where M represents a metal belonging to group 1A of the periodic table, n is an integer from 2 to 6, and x is from 20 to 40. Is an integer. Specific examples of metals belonging to Group 1A include lithium, sodium, potassium, and the like.

The silicate is selected in consideration of the properties and physical properties of the composition, and is selected in consideration of water resistance, heat resistance, foaming rate and adhesion to the substrate. Although it does not restrict | limit especially in this invention, It selects from sodium silicate, potassium silicate, and lithium silicate, and uses single or 2 or more types.

Such silicates are used to be 40 to 70% by weight of the total fireproof coating composition, when the content is less than 40% by weight, the leveling (leveling) of the coating film is poor, when the content exceeds 70% by weight the heat resistance is lowered . Preferably the silicate content is 50-70% by weight.

In the present invention, the molar ratio (SiO ₂ / M ₂ O) is changed while maintaining the non-volatile content of the silicate using an alkali metal compound or amorphous silica in order to have a maximum foaming rate while maintaining the heat resistance in the event of fire. Accordingly, the composition of the present invention does not melt and flow down the foam layer even after a predetermined time or more at a very hot high temperature.

A method of adjusting the molar ratio (SiO ₂ / M ₂ O) of the silicate can be used a method of adding the alkali compound or an amorphous silica for the silicate of a certain molar ratio. As an alkali metal compound used as a regulator of the molar ratio (SiO ₂ / M ₂ O) of the silicate, hydroxides such as NaOH and KOH may be used alone or in combination of two or more thereof. The amorphous silica may include white carbon. ), Aerosil, silica sol (Silica-Sol) and other amorphous silica may be used alone or in combination of two or more thereof.

The molar ratio adjustment of the silicate can be carried out by adding the above-mentioned molar ratio adjusting agent to the silicate and dissolving it for about 10 to 20 minutes by low-speed stirring, at which time it is more effective to maintain the temperature of about 60 ℃.

The molar ratio adjusting agent of the silicate is preferably used so that the molar ratio (SiO ₂ / M ₂ O) of the silicate is 1.9 to 4.0. If the molar ratio is smaller than 1.9, the alkali component is present in too much so that the water resistance is lowered and the coating film is well dried. If it is greater than 4.0, the foaming rate is insufficient at the time of fire, and the drying speed is too fast to cause cracking of the coating film, and the storage property of the coating material is also unstable. More preferably, the molar ratio of the silicate is 2.0 to 3.5, even more preferably the object of the present invention can be achieved within the range of 2.1 to 3.3.

On the other hand, the silicate in the form as described above is excellent in foaming ability in itself, but due to the extender pigments or other fillers used in the past, it is impossible to maintain the heat resistance while maintaining a high density of the foam layer even at a high temperature of 600 ℃ or more. . Thus, the present invention uses the following blowing agent (Blowing Agent) to solve this problem.

Specifically, in the present invention, as the foaming aid, calcium-based inorganic materials, expandable pearl rock, expandable vermiculite and the like are used alone or in combination of two or more thereof. The calcium-based inorganic material is characterized by the release of an inert gas such as carbon dioxide by thermal decomposition, for example, limestone, calcium carbonate, calcite and the like. In addition, the effervescent pearlite, expandable vermiculite, and the like are characterized in that the above-mentioned inert gas is adsorbed, and at least one kind of pearlite and / or vermiculite which has been foamed (or expanded) or not yet foamed (or expanded) may be selected and used. have.

Preferably, as the foaming aid, two or more materials selected from calcium-based inorganic materials, expandable pearlite and expandable vermiculite may be mixed and used. That is, for example, a foaming pearlite and expandable vermiculite, calcium-based inorganic material and expandable pearlite, calcium-based inorganic material and expandable vermiculite, or a mixture of calcium-based inorganic material / expandable vermiculite / foamable pearlite can be used. At this time, the mixing ratio of each substance can be appropriately determined by those skilled in the art.

The foamable pearlite and expandable vermiculite among the foaming aids used in the present invention form a very fine cell layer inside the foamed layer of thermally expanded silicate in case of fire so that the density of the foamed layer can be maintained high even at a very hot high temperature. Therefore, the average particle size is very important, so that the particle size is adjusted. Currently, various kinds of products are introduced according to the average particle diameter and the foaming start temperature, and preferably those having an average particle diameter of 0.1 to 2.0 mm are used. Use of a material having an average particle diameter within the above range can lower the density of the foam insulation layer, thereby preventing the heat resistance and the insulation performance from being lowered.

In addition, the amount of the foaming aid is suitably in the range of 0.2 to 20% by weight of the total fireproof coating composition. If the content is less than 0.2% by weight, the performance of the foaming aid is not properly exhibited. If the content is more than 20% by weight, the foaming area of the foaming aid is excessively large compared to the area of the silicate foaming, which causes cracks in the silicate foaming layer. As a result, the density of the foam insulation layer becomes low and it is impossible to protect the workpiece from heat. Preferably 5 to 15% by weight is used.

On the other hand, the fireproof coating composition of the present invention uses a reinforcing material to increase the dry strength (durability) of the coating film and to exhibit a more effective function in the event of fire. By using such a reinforcing material, it is possible to prevent the coating film from cracking due to moisture evaporation after a long time at room temperature after construction of the coating layer in the building, to increase the strength of the foam layer in case of fire, to increase the heat resistance and cracking of the foam layer Prevention can be achieved. In the event of a fire, carbon dioxide is released by pyrolysis due to a temperature rise, and it exists in the pores of the inorganic fibrous material as an additive to block the oxygen source, thereby preventing continuous flame propagation. These reinforcing materials may be used alone or in combination of two or more thereof.

Examples of the reinforcing material is not particularly limited, but glass fiber, ceramic fiber, rock wool, or the like may be used alone or in combination of two or more thereof. In particular, such a reinforcement material is important to remove the length of the fibrous phase and impurities mixed in the fiber, and preferably, the length of the fibers is 3 mm or less, and mixed impurities such as shots are removed in the fiber by chapping. Use Clean Fiber.

The content of such a reinforcing material is preferably 0.5 to 10% by weight of the total fireproof coating composition, if the content is less than 0.5% by weight, the effect as a reinforcing material is insignificant. The acidity is bad, which lowers the production efficiency. More preferably, the reinforcing material is used in the range of 1 to 7% by weight.

In the present invention, the hydroxide is used as an additive for improving the fire resistance of the foamed foam layer in case of fire. These hydroxides are flame retardant and heat resistant additives, dehydrated at a temperature of 340 ° C. or higher when a fire occurs, and exhaust the heat transferred to the steel by performing endothermic reactions to retard the temperature rise of the steel. In addition, the hydroxide is condensation reaction of the metal which is dehydrated to the silicate in the foamed layer expanded by the expansion of the silicate, the condensation reaction to further strengthen the network structure to increase the strength of the foamed layer to melt the foamed layer even at a high temperature of 1000 ℃ or more Improve fire resistance by preventing from falling down.

Hydroxide for this use includes magnesium hydroxide, calcium hydroxide, aluminum hydroxide, and the like, which may be used alone or in combination of two or more thereof. In addition, the average particle diameter of the hydroxide is important, in order to see the effect in a small amount. Preferably, the average particle diameter of the hydroxide is 0.5 to 10㎛, the amount of use is 0.2 to 15% by weight of the total fireproof coating composition. If the amount used is less than 0.2% by weight, the effect of achieving the use of wood is insignificant.When it is used more than 15% by weight, the dispersing efficiency of the coating material becomes poor and the strength of the silicate foam layer is sharply strengthened in the event of a fire, resulting in the foaming rate of the coating film. It will adversely affect. Preferably it is 3-10 weight%.

When the viscosity is appropriately adjusted using, for example, water as a solvent in the composition as described above, the foamable fireproof coating composition according to the present invention can be completed. At this time, the amount of the solvent is 0.5 to 30% by weight, preferably 5 to 20% by weight of the total fireproof coating composition in terms of viscosity control.

The foamable fireproof coating composition of the present invention configured as described above is a mixture of silicate using amorphous silica, a regulator for controlling the molar ratio, a specific foaming aid, a reinforcing agent, an additive, and a solvent at an appropriate ratio, thereby preventing cracking and lack of heat resistance of the foam layer. Effective control maintains long-term fire resistance even at very hot and high temperatures.

Therefore, the foamed fireproof coating material obtained according to the present invention can be used as an excellent fireproof coating material for pillars and beams of general buildings and factory buildings, hazardous material storage and treatment facilities.

Hereinafter, the Example and comparative example of this invention are illustrated. The following examples are merely provided to aid the understanding of the present invention, whereby the technical scope of the present invention is not limited.

Example 1: Examples 1-1 to 1-9

60% by weight of each sodium silicate, whose molar ratio (SiO ₂ / M ₂ O) was adjusted to 2.0, 2.3, 2.5, 2.7, 3.0, 3.3, 3.5, 3.7, 4.0 as silicate resin, and the amorphous silica content as a molar ratio regulator was 30 ±. 7% by weight silica sol with a mean particle size of 10 nanometers or less, 3% by weight of calcite fiber, ceramic fiber as reinforcement, 7% by weight of calcium hydroxide with an average particle size range of 5 ± 1 micrometer, as an additive 10 wt% of expandable vermiculite having an average particle size of 1 ± 0.1 millimeter as a foaming aid and 13 wt% of water as a solvent were added sequentially, followed by stirring using a dissolver or the like at a speed of 1,500 rpm or more for 20 to 30 minutes. Nine fireproof coating compositions of the present invention of -1 to 1-9 were prepared.

Example 2: Examples 2-1 to 2-9

65% by weight of each potassium silicate with a molar ratio of 2.0, 2.3, 2.5, 2.7, 3.0, 3.3, 3.5, 3.7, 4.0 as silicate resin, amorphous silica content as molar ratio regulator in the range of 30 ± 5% by weight and average particle size 8 wt% of silica sol of 10 nanometers or less, 3 wt% of calcite fiber, ceramic fiber as reinforcing material, 8 wt% of calcium hydroxide with average particle size of 5 ± 1 micrometer as additive, average particle size of foaming aid 1 8% by weight of effervescent pearlite in the range of ± 0.1 mm and 8% by weight of water as a solvent were added in this order, followed by stirring using a Dissolver or the like at a speed of 1,500 rpm or more for 20 to 30 minutes. Nine fire-resistant coating compositions of the invention were prepared.

Example 3

The fireproof coating composition of the present invention was carried out in the same manner as in Example 1-6, except that 5% by weight of expanded vermiculite having an average particle size of 1 ± 0.1 mm and 5% by weight of limestone, which is a calcium-based inorganic material, were used as the foaming aid. Was prepared.

Example 4

A fireproof coating composition of the present invention was prepared in the same manner as in Example 1-6, except that NaOH was used instead of silica sol as the molar ratio regulator.

Example 5

A fireproof coating composition of the present invention was prepared in the same manner as in Example 1-6, except that KOH was used instead of silica sol as the molar ratio regulator.

Example 6

A fireproof coating composition of the present invention was prepared in the same manner as in Example 3 except that 4 wt% NaOH and 4 wt% KOH were used instead of the silica sol as the molar ratio regulator.

Comparative Example 1

Instead of 10% by weight of expandable vermiculite, 3% by weight of expandable graphite having an average particle size of 80 µm was used, 10% by weight instead of 13% by weight of water, and 10% by weight of extender pigment (kaolinite) was used. Except that was carried out in the same manner as in Example 1-6 to prepare a fireproof coating composition of the present invention.

Fire resistance performance test was carried out for the fire resistant coating composition prepared according to the Examples and Comparative Examples as follows.

Experimental Example 1 Povido

Povido according to the molar ratio of silicate (alkali-silicate) was measured as follows, and the result is shown in FIG. Specifically, a total of 18 compositions obtained in Examples 1 and 2 were applied to the iron plate of size 50mm x 50mm, 1.6mm thickness, respectively, 1mm thick and then in the electric furnace 400 ℃, 500 ℃, 600 ℃ 30 30 Heating was performed for minutes to determine the thickness of the sieve. At this time, povido was divided by the initial thickness of the povid thickness and each thickness was measured before and after the flame test.

As a result, in the composition of Example 1, as shown in FIG. 1A, the molar ratio of silicates at 400 ° C. was 3.3 (Examples 1-6) and 4.0 (Examples 1-9) at 400 ° C., and the silicate molar ratio was 2.5 at 500 ° C. The best povido in (Example 1-3) and at 600 ° C. was shown in the molar ratio of silicate 2.3 (Example 1-2). As a result, in Example 1, it was found that the povidity was excellent at a low silicate molar ratio as the temperature increased. In addition, in Example 2, as shown in Figure 1b, it was found that the povidity was excellent at a low silicate molar ratio as a whole.

Experimental Example 2 Heat / Flame Performance Test

This test is to confirm the fire resistance performance of the fire resistant cladding by coating it with fireproof coating on the structural parts of beams and columns of general buildings, factory buildings, hazardous materials storage and treatment facilities. Specifically, after installing thermocouples on the steel plates and plywood at equal intervals, the fireproof coating is coated and subjected to a heat test for 1 hour. Is to evaluate whether to block. At this time, a torch lamp was used as a heat source. Fire resistance performance is divided into thermal insulation performance and flame retardant performance according to Korean Industrial Standard (KS) .In the case of thermal insulation performance, the average temperature should be within T ₀ +140 ℃ for the initial temperature (T ₀ ), and the maximum temperature is It should not exceed T ₀ +180 ° C. In the case of wood, there should be no flame propagation on the back side.

Experimental Example 2-1: Thermal Performance Test

After testing the thermal insulation performance of the fireproof coating composition of the present invention for the iron plate the results are shown in Table 1 and FIG. Specifically, the heat shielding performance was tested by applying the composition of Examples 1 to 3 and the fireproof coating composition obtained in Comparative Example 1 on a 1.6 mm thick iron plate, respectively.

As a result, as shown in Table 1, in the case of Example 1, in particular, in the molar ratio 3.3 (Examples 1-6) and 4.0 (Examples 1-9) to satisfy the heat shielding performance of the criteria for the refractory conditions In the case of Example 2, the molar ratio of 2.5 (Example 2-3) and 3.3 (Example 2-6) were found to satisfy the heat shield performance criteria.

Example 3 was also found to satisfy the thermal insulation performance criteria as shown in Table 1 and Figure 2a, Example 1 and Example 2 using the expanded vermiculite or expandable pearlite alone as the foaming aid Better results were obtained. On the other hand, in Comparative Example 1, as shown in FIG. Flame temperature by a torch lamp generally available on the market is shown in Figure 3a.

Experimental Example 2-2: Flame retardant performance test

After testing the flame retardant performance of the fireproof coating composition of the present invention for the plywood the results are shown in FIG. Specifically, the flame retardant performance of the fireproof coating composition of Example 2-6 was applied to the plywood having a thickness of 12 mm by about 2 mm.

As a result, as can be seen in Figure 3a, the general flame temperature of the torch lamp was an average 800 ℃ range, the time to reach 800 ℃ was within 15 minutes. However, in the case of the plywood to which the refractory coating composition (silicate molar ratio 3.3) of Example 2-6 was applied, as shown in FIG. 3b, the temperature of the back surface of the plywood did not exceed 200 ° C., and wood was added even after 1 hour after the flame was applied. It was confirmed that the flame was not propagated and excellent in flame retardancy.

Therefore, from the above experimental results, it can be seen that the foamable fireproof coating composition according to the present invention is excellent in povidity, fire resistance performance results, strength, appearance of the foam coating film, and the like.

Figure 1a is a view showing the povido according to the molar ratio of the silicate of Example 1,

Figure 1b is a view showing the povido according to the molar ratio of the silicate of Example 2,

Figure 2a is a view showing the thermal insulation performance test results of Example 3,

Figure 2b is a view showing the thermal insulation performance test results of Comparative Example 1,

3a is a view showing a flame temperature by a general torch lamp,

3B is a result of flame retardancy test of plywood to which the refractory coating composition (silicate molar ratio 3.3) of Example 2-6 was applied.

Claims (9)

Silicate 40 to 70% by weight; A mole ratio of silicate selected from alkali metal compounds or amorphous silica, 1 to 15% by weight of a regulator of SiO ₂ / M ₂ O, wherein M is a metal belonging to group 1A of the periodic table; 0.2 to 20 wt% of single or two or more foaming aids selected from calcium-based inorganic materials, expandable perlite and expandable vermiculite; 0.5-10% by weight of stiffeners; 0.2-15 wt% hydroxide additive; And 0.5-30 wt% solvent Foam fireproof coating composition comprising a. The method of claim 1, The foamable pearlite and expandable vermiculite is a foamable fireproof coating composition, characterized in that the average particle diameter of 0.1 ~ 2.0mm. The method of claim 1, The foaming aid is a foamed fireproof coating material composition, characterized in that at least two selected from calcium-based inorganic materials, expandable pearlite and expandable vermiculite. The method of claim 3, The calcium-based inorganic material is a foamable fireproof coating composition, characterized in that one or more selected from limestone, calcium carbonate and calcite. The method of claim 1, The silicate is a foamed fireproof coating material composition, characterized in that one or more than one selected from sodium silicate, potassium silicate and lithium silicate. The method of claim 1, The modulating agent is a foamable fireproof coating composition, characterized in that it is used so that the molar ratio of SiO ₂ / M ₂ O of 1.9 to 4.0. The method of claim 1, The modulating agent is a foamed fireproof coating composition, characterized in that one or more selected from NaOH, KOH, white carbon, and silica sol. The method of claim 1, The reinforcing material is a single or two or more selected from glass fibers, ceramic fibers and rock wool, the length of the fiber is less than 3mm, the foam (fireproof coating material), characterized in that the shot (shot) in the fiber is removed. The method of claim 1, The hydroxide additive is a foamable fireproof coating composition, characterized in that one or more selected from magnesium hydroxide, calcium hydroxide and aluminum hydroxide having an average particle diameter of 0.5 ~ 10㎛.

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