KR100368169B1 - Foam Resistant Paint Composition - Google Patents

Abstract

The present invention relates to a non-halogen water-based foamable refractory coating composition having good water resistance and excellent fire resistance.

The paint composition of the present invention is 5 to 35% by weight of an alkyl-modified vinyl acetate copolymer represented by the following formula (1), 5 to 25% by weight blowing agent, 13 to 45% by weight catalyst, 5 to 25% by weight carbonizing agent, 0.1 to 7 reinforcing agent It is composed of weight percent, pigment 3-15 wt%, additive 3-15 wt% and water 10-40 wt%. This is an aqueous foaming refractory paint, which can provide good working environment and environmental friendliness which reduces environmental pollution. When applied to mineral wool boards, cables, trays, concrete, steel and wood, it gives fire resistance to these surfaces, which provides excellent fire resistance in the event of fire and does not contain halogenated compounds. Can provide sufficient time.

[Formula 1]

In the above formula, x has a value of 0.95 to 0.30, y is 1-x, and R ₁ and R ₂ are the same or different and are linear, cyclic and tertiary hydrocarbon groups having 1 to 15 carbon atoms.

Description

Foam Refractory Paint Composition

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed refractory paint composition, and to a non-halogen-aqueous foamable refractory paint composition which can be applied to the surface of an iron structure to exhibit fire resistance, and a coating film preparation prepared using the same.

Refractory paints are strictly for the purpose of protecting the building from fire and, more broadly, for the protection of life. In other words, when a fire breaks out, the high temperature heat blocks or delays the access to the steel, providing time to extinguish the fire or to save lives.

In particular, as the buildings are getting higher, fireproof structures are essential. Fireproof structure refers to a structure that can be reused by simple repair after fire as well as having fire resistance to withstand high temperatures in case of fire.

Refractory structures used for steel fireproof coatings have been synonymous with rock wool and vermiculite materials such as la coats. However, in Western countries, the use of rock wool or vermiculite has already been regulated, and the expectation for environmentally friendly fire-resistant paints is gradually increasing.

Among these, the refractory refractory paint is a paint in which a dry coating layer foams when exposed to heat to form a carbonized layer. The carbonized layer protects the coating (steel) from flame and combustion heat for a predetermined time. The carbonized layer itself is finally burned, but it takes some time until it is burned, so the influence of the subject is small.

The low carbon steel used in the construction steel structure has a critical temperature of 540 ℃, and the strength of the low carbon steel is usually reduced to about 60% above the critical temperature. Is carried out. In the case of rock wool and vermiculite, the working environment is poor and the aesthetics are poor. Therefore, refractories are used in Europe and America.

The advantages of fire-resistant paints include reducing the load on steel structures, increasing the rust resistance, enhancing the aesthetics of steel parts exposed to the outside, and reducing the cost of maintenance. have.

In general, foamed refractory paints have been formulated to improve fire resistance by mixing chlorinated materials. These types of materials are gradually regulated as they are classified as main pollutants for environmental pollution, especially ozone layer destruction. It is expected to eventually be banned.

In addition, when chlorinated materials are used in the foaming refractory paints, gases generated during combustion by fires are extremely toxic and corrosive, and therefore are very harmful to the human body in the event of fire and cause extensive damage to steel structures and equipment.

In addition, most of the foamable refractory paints are oil-based foamed refractory paints made mainly of oil-based resins and solvents, and these oil-based foamed refractory paints have environmental problems due to volatile organic solvents generated during field construction. In the case of poor ventilation conditions, these volatile organic solvents can harm the health of workers through breathing and cause a fatal adverse effect due to a fire caused by natural static electricity or accidental sparks.

Therefore, it is urgent to develop water-based foamable refractory paints that replace volatile organic solvents of oil-based refractory paints with water, which cause problems of environmental pollution and poor working conditions due to the use of organic solvents. As a result, the regulation of volatile organic substances is intensifying.

Some aqueous paints have been developed to meet these demands. Among such aqueous paints, an emulsion-type acrylic resin or vinyl acetate resin is known to be suitable for the foaming refractory paint.

For example, Patent Application 96-29553 (Priority Patent Application No. 96-25322) mentions a foamable refractory paint utilizing an aqueous resin such as an aqueous vinyl acetate-acrylate copolymer, a water-soluble polyester resin, or the like. However, in this case, since the acetate group of the resin structure meets with water and undergoes a hydrolysis reaction, the water resistance is lowered. Thus, in this case, the foaming rate is not sufficient (50 times or less), and thus there is a problem in that excellent fire resistance cannot be exhibited.

The present invention does not use chlorinated materials to solve the above problems, and replaces the oil-based resin and volatile organic solvent with the water-based resin and water, there is no problem of environmental pollution and working environment, problems of general water-based paint The purpose of the present invention is to solve the problem of phosphorus water resistance and to provide an aqueous foamable refractory paint having excellent water resistance.

Figure 1 shows the temperature rise curve of the KSF 2257 and the actual temperature rise curve during the test in the fire resistance test measurement for the refractory coating composition prepared according to Examples and Comparative Examples.

According to the present invention 5 to 35% by weight of the alkyl-modified vinyl acetate copolymer represented by the following formula (1), which gives durability, such as the formation and adhesion of a dry coating film when the coating of paint is completed after drying, a foaming agent for providing excellent foaming performance 5 25 wt%, 13 wt% -45 wt% catalyst, 5-25 wt% carbonization agent, 0.1-7 wt% reinforcing agent to strengthen the strength of the foam coating, 3-15 wt% pigment, 3-15 wt% additives, and water 10 A non-halogen, water-based foamable refractory coating composition is provided which is composed of -40 wt%.

Formula 1

Wherein x has a value from 0.95 to 0.30, y is 1-x, and R is _One , R ₂ Are the same or different and are linear, cyclic, and tertiary hydrocarbon groups having 1 to 15 carbon atoms.

Compositions constituting the non-halogen, water-based foaming refractory paint of the present invention are specifically as follows.

(1) resin

The resin is durable at room temperature and when the dry hardened film is exposed to high temperature heat, it changes the coating into a fluid state so that the coating film can be properly foamed when gas is generated.

In the present invention, as the resin having such a role, an alkyl-modified vinyl acetate copolymer is used, which has good durability such as chemical resistance, weather resistance, and flexibility, and in particular, excellent foamability and excellent water resistance, and glass transition. The temperature is in the range of -30 ° C to 60 ° C and the coating film formation temperature is an aqueous resin having a range of 0 ° C to 30 ° C. In general, the aqueous vinyl acetate resin has a problem of poor water resistance, the present invention solved the water resistance problem by using an alkyl-modified vinyl acetate copolymer as shown in the formula (1).

Specifically, the alkyl modified vinyl acetate copolymer of Formula 1 makes it difficult for the acetate group (OC = O) to meet with water due to the alkyl modification, that is , the steric effect due to R ₁ and R ₂ in the structure . Water-based paints use water, which causes a hydrolysis reaction when the resin reacts with water, thereby lowering the water resistance. By the way, in the case of alkyl-modified vinyl acetate copolymer, R ₁ , R ₂ in the structural formula makes the hydrolysis reaction of the acetate group (-CC = O) and water in the resin difficult, thereby greatly improving the water resistance of the coating film. It is to let. In addition, it minimizes the bonding of the pores of the dry coating film and thereby can prevent the bubbles to escape during foaming can improve the foaming performance.

In other words, unlike vinyl acetate-acrylate copolymers used as binders for water-based paints, alkyl-modified vinyl acetate copolymers have a fixed size of alkyl groups modified in acrylate as shown in Formula 1 to improve water resistance due to steric hindrance effects. Make it work.

If the paint film of the refractory paint is absorbed for a long time due to poor water resistance and contains a large amount of water in the coating film, the vaporization of the water vapor during foaming may cause cracking of the foam coating film and thereby premature dropping of the foam coating film. It acts as an inhibitor in the fire resistance performance over time.

In addition, due to cracks or pores in the coating due to the vaporization of moisture during foaming, the gas acting to foam the coating film during the foaming reaction to inflate the coating film to a certain thickness may leak, which may also act as a cause of lowering the release rate.

The inhibitory elements of the foamed coating as described above can be improved by the effect of alkyl-modified vinyl acetate.

The content of such alkyl-modified vinyl acetate copolymer is 5 to 35% by weight, preferably 7 to 25% by weight of the total coating composition. If the content of the resin is less than 5% by weight based on the total weight of the total composition, the durability of the dry cured coating film becomes poor. If the content of the resin exceeds 35% by weight, the foaming rate is lowered, and the coating film is peeled off during foaming, thereby preventing normal fire performance. Not preferred.

In the present invention, it is possible to achieve the object by using an alkyl-modified vinyl acetate copolymer having a resin as described above in a conventional aqueous coating composition.

When preparing a paint including such an alkyl modified vinyl acetate copolymer, the amount of the alkyl modified vinyl acetate copolymer is preferably 10 to 30% by weight based on the total weight of the solid. The reason is that if the solid content is less than 10% by weight, it is impossible to form a foam coating film when foaming due to lack of resin components, and if it exceeds 30% by weight, the foaming property itself may cause problems due to the small amount of other added blowing agent or carbonizing agent. Can be.

Hereinafter will be described with respect to the additives to form a refractory paint in addition to the resin as described above, which may include water because it is a blowing agent, a catalyst, a carbonizing agent, a reinforcing agent, a pigment, an additive, and an aqueous coating. This is not particularly limited, and of course, additives for forming a conventional refractory paint may be used.

(2) foaming agent

The blowing agent decomposes at a high temperature to react with the carbonizing agent and the catalyst to form a carbonized layer and generates a gas during the reaction to serve to make the carbonized layer foam properly. Such foaming agents include melamine, dimethylanamide, urea, glycine, and the like.

The content of the blowing agent is 5 to 25% by weight, preferably 8 to 20% by weight of the total paint composition. If the content of the blowing agent is less than 5% by weight based on the total weight of the entire composition, the formation of the carbonized layer is poor and the gas generated is insufficient, so that the foaming of the carbonized layer is weak. It is not preferable because the carbonized layer is cracked due to excessive ejection of gas before foaming of the carbonized layer, so that it is impossible to exhibit normal fire resistance.

(3) catalyst

In addition, the catalyst decomposes at a high temperature to promote the reaction of the carbonizing agent and the blowing agent while releasing the gas and at the same time participates in the reaction to form a carbonized layer. Such catalysts include Primary Ammonium Phosphate, Secondary Ammonium Phosphate, Ammonium Phosphite, Ammonium Polyphosphate, Melamine Phosphate, Dimelamine Phosphate (Dimelamine Phosphate), Melamine Pyrophosphate and Tricresyl Phosphate.

The content of such a catalyst is 13 to 45% by weight, preferably 15 to 35% by weight. If the content of the blowing agent is less than 13% by weight based on the total weight of the total composition, the reaction with the carbonizing agent and the blowing agent is undesired. If the content of the blowing agent is more than 45% by weight, the foaming rate is lowered, and thus the fire resistance is lowered.

(4) carbonization

The carbonizing agent serves to form a carbonized layer that exhibits fire resistance by reacting with the blowing agent at a high temperature. These carbonizing agents include pentaerythritol, dipentaerythritol, tripentaerythritol, tripentaerythritol, sorbitol, trimethylolpropane, trimethylolpropane, and trimethyloletane. (Ditrimethylolpropane).

If the carbonizing agent is less than 5% by weight based on the total weight of the entire composition, the chemical reaction with the blowing agent is insufficient, making it difficult to form a suitable carbonized layer. If the carbonizing agent is more than 25% by weight, the foaming rate is lowered, which is not preferable because the fire resistance is lowered. The carbonizing agent is used at 5 to 25% by weight, preferably at 7 to 17% by weight.

(5) reinforcing agents

The reinforcing agent increases the strength of the carbonized layer when the dry hardened film is foamed at a high temperature and forms a foamed coating film having a carbonized layer, thereby improving the fire resistance by preventing the foamed film from peeling or partially blowing from surrounding flames. . Such reinforcing agents include metal oxides such as molybdenum trioxide, zirconium dioxide, aluminum hydroxide, metal compounds such as metal hydrates, zinc borate, inorganic materials such as glass powder, and silicon pigments.

The content of the reinforcing agent is 0.1 to 7% by weight, preferably 0.2 to 5% by weight of the total paint composition. If the content of the reinforcing agent is less than 0.1% by weight based on the total weight of the entire composition, the strength-improving effect of the foamed layer is insignificant. If the content of the reinforcing agent is more than 5% by weight, the strength of the carbonized layer is so hard that the carbonized layer cracks when gas is generated, It is not preferable because it significantly reduces the fire performance is very poor.

(6) Pigment

Pigments are generally used to impart color to all paints. In addition to the purpose of color, refractory paints play a role in improving the fire resistance performance.

The content of the pigment is 3 to 15% by weight, preferably 4 to 10% by weight. If the content of the pigment is less than 3% by weight based on the total weight of the total composition, the coloring power is insufficient, and it is difficult to form a uniform pore layer inside the foam coating during the foaming process. It is not preferable because the rate is poor and the fire resistance falls. 3 to 15% by weight of the pigment, preferably 4 to 10% by weight is used.

(7) additive

As an additive, cryoprotectants, fusing agents, thickeners, dispersants, antifoaming agents, preservatives, and pH adjusting agents are mixed at an appropriate ratio to achieve optimum paint and coating performance.The additive is 3 to 15% by weight based on the total weight of the total composition. use.

(8) water

Water is used to maintain the stable state of the paint and smooth paintability. If it is less than 10% by weight based on the total weight of the total composition, painting is very difficult, and if it exceeds 40% by weight, solids in the paint Sedimentation hardens and thixotropy (떨어지 性) falls, so if you raise the back coat during painting, the paint flows down, making it very difficult to obtain the desired dry coat thickness. The content of water is 10 to 40% by weight, preferably 15 to 30% by weight, based on the total weight of the total composition.

On the other hand, if the technical description of the foaming process of the non-halogen, water-based foaming refractory paint of the present invention having the composition as described above are as follows.

Foaming Stage 1

When heat is applied to the dry coating surface due to a fire or the like and the softening point of the organic component (particularly, an aqueous resin or the like) is higher, the coating film is converted into a fluid state. This state means that the coating film is prepared in a state suitable for starting foaming.

Foaming Stage 2

As the temperature of the coating rises, the catalyst, blowing agent and carbonizing agent and other organic components are decomposed and various gases are released. Although the gas emitted varies slightly depending on which component in the coating is decomposed, it is usually water vapor, ammonia, carbon dioxide, etc., and they push out components such as resin in a flow state, thereby naturally forming a foam layer in the coating film. As it forms, the coating film starts to foam.

Foaming Stage 3

As the foaming continues, the surface layer of the foamed coating starts to carbonize. Initially, expansion and carbonization proceed simultaneously, but as carbonization increases over time, the expansion of the coating gradually slows down, and after a certain time, only carbonization proceeds without foaming. The thickness of the foam layer thus formed is 50 to 150 times the initial dry coating thickness, and as a result of the foaming, the density of the carbonized layer is lower than that of the initial coating film.

Four stages of firing

The foam layer continues to carbonize until the entire white is finally white, preventing external heat from reaching the workpiece.

Through the above foaming process, foaming film having 50 to 150 times of foaming rate is formed, and the expanded foaming film has no dropping or blowing off of the foamed coating due to the flame, and heat transfer from the surrounding high temperature heat to the iron structure by fire. It is a major factor that effectively blocks

It can be seen that the refractory coating composition according to the present invention can exhibit an efficient thermal insulation effect as a low dry coating thickness by combining the excellent foaming ratio and the coating film strength as described above.

Therefore, non-halogen and water-based foamed refractory paints mixed by controlling each raw material at an optimum ratio can be used in general buildings and factory buildings used by many people, such as schools, hospitals, department stores, and ships and marine structures. It can be used where fire resistance is required and can be used in various applications such as automobiles, aircrafts, mobile homes.

In particular, factory buildings and dangerous goods are stored according to the fire resistance test method according to Korean Industrial Standard KSF 2257 (fire resistance test method of building structure part, National Construction Test Building No. 58842-207) in accordance with the standard of Ministry of Construction and Transportation Notice 1998-248. And paints for 1 hour fireproof coatings on columns and beams in processing facilities.

In the case of general foamed refractory paints, when the dry hardened coating film is exposed to high temperature heat by a fire or the like to form a carbonized layer, and if it is continuously exposed to high temperature heat after foaming, the foamed layer is whitened and the strength is very weak. Peeling or blowing.

However, the non-halogen and water-based foamed refractory paints of the present invention have a fireproof performance because the reinforcing agent is effectively mixed with the paint in an appropriate ratio so that the reinforcing agent effectively exerts the strength of the whitening layer as described above and does not peel off or fly off by a flame or the like. Maintain a long time continuously.

When the non-halogen and water-based foaming refractory paint composition is coated on the surface of mineral wool board, cable, tray, concrete, steel, or wood, a dry hardening film is formed, and when heated, the coating film forms a foam layer to exert an insulating effect. Can be.

At this time, it is preferable that the thickness of the dried film is 0.5-3 mm.

The painting method may be brush painting, air spray painting, airless spray painting, roller painting, or the like.

Hereinafter, the effects of the present invention will be described in detail through Examples and Comparative Examples, but the scope of the present invention is not limited to the following Examples. The content in the following Examples and Comparative Examples means parts by weight.

Example 1

23 parts of water was added to a container capable of preparing paint, and 0.1 parts of thickener Natrosol 250HBR (Natrosol 250HBR, manufactured by Aqualon UK Ltd) and 1.1 parts of dispersant 190 (byk-Chemie), antifoam beaker 019 (Byk 019, manufactured by Byk-Chemie) 0.5 parts, 0.2 parts of preservative Actiside AS (product of Thor Chemie GMBH), 3.5 parts of cryoprotectant Propylene Glycol, fusing agent Texanol, Honeywill & Stein Ltd Product) After 0.5 parts are sequentially added, it is stirred at low speed until it becomes uniform. When the uniform state is reached, 4.3 parts of titanium dioxide (TiO ₂ ) as a pigment, 1.5 parts of molybdenum trioxide (MoO ₃ ) as a reinforcing agent, 24.4 parts of ammonium polyphosphate, 7.8 parts of dipentaerythritol, and 7.1 parts of melamine are added in a slow stirring state. The mixture was added and stirred until it became a uniform state, followed by high speed dispersion. When the dispersion is completed, the alkyl-modified vinyl acetate copolymer emulsion resin having a solid content of 55% by weight ( x = 0.8 in Formula 1, y = 0.2, R ₁ = CH ₂ CH ₃ , R ₂ = CH ₂ CH ₂ CH ₂ CH ₃ parts copolymer ) 26 parts was added while stirring at low speed, and it stirred until it became a uniform state, and the non-halogen, water-based foaming refractory paint was produced (15.4 weight% of alkyl-modified vinyl acetate copolymer solid content in final coating film).

Example 2

1.5 parts of molybdenum trioxide (MoO ₃ ), 24.4 parts of ammonium polyphosphate, 7.8 parts of dipentaerythritol, 7.1 parts of melamine, instead of 1.3 parts of zinc borate, 23.6 parts of ammonium polyphosphate, 8.5 parts of pentaerythritol, 7.4 parts of melamine A non-halogen and water-based foamable refractory paint was prepared in the same manner as in Example 1 except that it was used.

Example 3

1.5 parts of molybdenum trioxide (MoO ₃ ), 24.4 parts of ammonium polyphosphate, 7.8 parts of dipentaerythritol, 7.1 parts of melamine instead of using 1.5 parts of aluminum hydroxide, 23.6 parts of ammonium polyphosphate, 8.4 parts of dipentaerythritol, melamine 7.3 A non-halogen and water-based foamable refractory paint was prepared in the same manner as in Example 1 except that parts were used.

Example 4

Instead of using 1.5 parts of molybdenum trioxide (MoO ₃ ), 24.4 parts of ammonium polyphosphate, 7.8 parts of dipentaerythritol, 7.1 parts of melamine, 1.7 parts of zirconium dioxide, 18.7 parts of ammonium polyphosphate, 6.1 parts of dipentaerythritol, melamine 4.5 A non-halogen, water-based, foamable refractory paint was prepared in the same manner as in Example 1, except for using parts and using 9.8 parts of melamine pyrophosphate.

Comparative Example 1

Chlorinated paraffin (chlorine content 70%) instead of using 1.5 parts of molybdenum trioxide (MoO ₃ ), 24.4 parts of ammonium polyphosphate, 7.8 parts of dipentaerythritol, 7.1 parts of melamine, and 26 parts of alkyl-modified vinyl acetate copolymer emulsion resin. An aqueous based fire-resistant fire-resistant paint was prepared in the same manner as in Example 1 except that 3.0 parts, 24.1 parts of ammonium polyphosphate, 7.6 parts of dipentaerythritol, 7.0 parts of melamine, and 25 parts of acrylate copolymer emulsion resin were used.

Comparative Example 2

Chlorinated paraffin (chlorine content 70%) instead of using 1.5 parts of molybdenum trioxide (MoO ₃ ), 24.4 parts of ammonium polyphosphate, 7.8 parts of dipentaerythritol, 7.1 parts of melamine, and 26 parts of alkyl-modified vinyl acetate copolymer emulsion resin. A water-based foamable fire-resistant paint was prepared in the same manner as in Example 1 except that 3.0 parts, 24.1 parts of ammonium polyphosphate, 7.6 parts of dipentaerythritol, 7.0 parts of melamine, and 25 parts of vinyl acetate-acrylate copolymer emulsion resin were used.

Experimental Example 1

The non-halogen, aqueous refractory paints prepared in Examples 1 to 4 of the present invention and the aqueous refractory paints prepared in Comparative Examples 1 to 2 were dried on an H beam for fire resistance performance test, and on a general iron specimen for dry resistance coating. Was coated so that the thickness of 0.9 ± 0.05mm, fire resistance performance test and water resistance test of the dry cured coating film was carried out by the following method.

Fire resistance test

This test is to confirm the fire resistance performance of fire resistant coatings by coating them with fireproof coatings on structural parts such as beams, columns and walls of general buildings, factory buildings, hazardous materials storage and treatment facilities. Specifically, after installing six thermocouples at equal intervals on the H-beam, paint the refractory paint and conduct a heating test for 1 hour under the standard heating conditions of KSF 2257, and the foam coating of the refractory paint is transferred from the surrounding heat to the test body. It is to evaluate how efficiently the heat transfer is blocked.

The standard heating test shall be carried out in a specified furnace that can meet the standard heating temperature conditions.The standard heating temperature shall be a CA thermocouple with a diameter of 1 mm with a performance of not less than 0.75 specified in KS C 1602, as specified in KS F 2257. When testing beams and columns, install at least three to eight thermocouples and measure the temperature at each site.

In this test, six thermocouples were installed at equal intervals on the test body, and the temperature of each site was measured.

In addition, the temperature change with time of the standard heating conditions and the actual heating temperature with time in the furnace in the test under such conditions were compared in Table 1, and the temperature rise curves according to the above two times are shown in FIG. .

The fire resistance performance test is based on the fire resistance test method of the building structure part specified in Korean Industrial Standard KSF 2257. For general buildings, the average temperature is 350 ℃ or less and the maximum temperature is 450 ℃ or less. According to laboratory building No. 58842-207, factory buildings and dangerous goods storage and treatment facilities are set at an average temperature of 538 ° C or below and a maximum temperature of 649 ° C or below.

TABLE 1

This test is a one hour fire resistance test that can be applied to factory buildings and hazardous materials storage and treatment facilities. It is tested for one hour in accordance with the fire resistance test method of the building structure part specified in Korean Industrial Standard KSF 2257. The maximum temperature of 649 ℃ or less should be maintained to be a fireproof coating applicable as a one-hour fireproof coating applicable to factory buildings and hazardous materials storage and treatment facilities.

Water resistance test

After coating the iron specimen with refractory paint, dry it sufficiently and completely deposit the test specimen in a tank containing water with sufficient air supply and record the time when abnormal phenomena such as swelling, cracking, and peeling occur.

The test results are shown in Table 2 below.

TABLE 2

As shown in Table 2, it can be seen that Examples 1 to 4 according to the present invention exhibited much better fire resistance performance and appearance and strength of the foamed coating film than those of Comparative Examples 1 to 2 using the conventional chlorine compound. By not using the compound, there is no environmental pollution, no harmful gas is generated during combustion by fire, etc., so it is not toxic and corrosive and therefore it is harmless to human body at the time of fire. In addition, Comparative Example 2 is poor in water resistance by using a vinyl acetate-acrylate copolymer emulsion resin, but the present invention can be seen that the water resistance is improved by using an alkyl-modified vinyl acetate copolymer emulsion resin.

This effect is due to the structure of the alkyl modified vinyl acetate used as the binder, the R of the alkyl modified vinyl acetate represented by the formula (1) _One , R ₂ This is because the acetate group (O-C = O) in the resin makes it difficult to meet the solvent water due to the steric effect. In general, the acetate group (OC = O) is a hydrolysis reaction with water to reduce the water resistance, making the hydrolysis reaction with water difficult, thus greatly improving the water resistance of the coating film, bonds such as holes in the dry coating film This minimizes the foam and prevents bubbles from escaping during foaming, thus improving foaming performance.

As described in detail above, non-halogen and water-based foaming refractory paints according to the present invention are fire resistant for one hour as a factory building and dangerous goods storage and treatment facility by the fire resistance test method of the building structure part specified in Korean Industrial Standard KSF 2257. Not only exhibits excellent fire resistance performance applicable to the coating material, but also excellent water resistance, even though it is a fire resistant paint.

Claims (5)

5 to 25% by weight of blowing agent, 13 to 45% by weight of catalyst, 5 to 25% by weight of carbonizing agent, 0.1 to 7% by weight of reinforcing agent, 3 to 15% by weight of pigment, 3 to 15% by weight of additive and 10 to 40% by weight of water In the foamable refractory paint composition by adding a%, The resin is an alkyl modified vinyl acetate copolymer represented by the following formula (1) and the content is 5 to 35% by weight, except that the solid content is present in an amount ranging from 10 to 30% by weight based on the total weight of solids in the coating composition Foamable refractory paint composition, characterized in that. Formula 1 In the above formula, x has a value of 0.95 to 0.30, y is 1-x, and R ₁ and R ₂ are the same or different and are linear, cyclic and tertiary hydrocarbon groups having 1 to 15 carbon atoms. The foaming fireproof coating composition according to claim 1, wherein the blowing agent is one or a mixture selected from melamine, dicyandiamide, urea, and glycine. The method of claim 1, wherein the catalyst is Primary Ammonium Phosphate, Secondary Ammonium Phosphate, Ammonium Phosphite, Ammonium Polyphosphate, Melamine Phosphate Dimelamine phosphate (Dimeiamine Phosphate), melamine pyrophosphate (Melamine Pyrophosphate) and tricresyl phosphate (Tricresyl Phosphate) is a foamable refractory paint composition characterized in that the one or a mixture. The method of claim 1, wherein the carbonizing agent is pentaerythritol, Dipentaerythritol, Tripentaerythritol, Tripentaerythritol, Sorbitol, Trimethylolpropane, Trimethyloletane And ditrimethylolpropane (Ditrimethylolpropane) is a foamable refractory coating composition, characterized in that the sole or mixture. The foamable refractory coating composition according to claim 1, wherein the reinforcing agent is one or a mixture selected from molybdenum trioxide, zirconium dioxide, aluminum hydroxide, zinc borate, glass powder, and silicon pigments.