KR101881310B1

KR101881310B1 - Ceramic paint composition for fire-proof painting and method of fire-proof painting using thereof

Info

Publication number: KR101881310B1
Application number: KR1020160028238A
Authority: KR
Inventors: 최승환
Original assignee: 최승환
Priority date: 2016-03-09
Filing date: 2016-03-09
Publication date: 2018-07-24
Also published as: KR20170105256A

Abstract

The present invention relates to a non-foamable flame-retardant ceramic paint for a steel structure fireproofing furnace and a refractory coating method using the same, and its object is to provide a fireproof coating method for a steel structure, And which can suppress flame propagation, and to provide a refractory coating method using the nonflammable flame retardant ceramic paint for steel frame refractory.
The present invention relates to a non-foamable flame-retardant ceramic coating for a steel structure refractory coating, which is applied on an intermediate foam layer made of a foamable refractory coating to form an upper ceramic layer;
The non-foamable flame-retardant ceramic paint is characterized by comprising 10 to 30 wt% of water, 25 to 60 wt% of an inorganic nanoceramic mixture, 15 to 50 wt% of a polyurethane acrylic hybrid emulsion, 2 to 30 wt% of an inorganic colored pigment, Retarding ignition time in the event of a fire, including 1 to 10 wt% of pigment, 1 to 10 wt% of silane coupling agent, 1 to 10 wt% of water repellent agent, 0.1 to 3 wt% of film forming agent, 0.1 to 5 wt% of thickener, .

Description

TECHNICAL FIELD [0001] The present invention relates to a non-foamable flame-retardant ceramic paint for a steel structure fireproofing furnace, and a fireproof coating method using the same. BACKGROUND ART [0002]

The present invention relates to a non-foamable flame-retardant ceramic paint for a steel structure fireproofing furnace and a refractory coating method using the same, and more particularly, to a fireproof coating method for a steel structure having a base surface or a backing layer having rust- The present invention relates to a non-foamable flame-retardant ceramic paint for a steel structure refractory coating which is applied to a foam layer and can delay the ignition time in the event of a fire, and a refractory coating method using the same.

In recent years, the weight of steel structures has been increasing as buildings have become higher and larger, and in particular, beams and columns subjected to the loads of buildings are very important parts, and it is necessary to use a steel material having excellent durability.

However, if the low-carbon steel which is generally used for the steel structure at the time of fire occurrence exceeds the critical temperature (540 ° C), the strength of the steel frame is usually reduced to about 60%, and the steel material inherent in the steel structure The tensile strength, the compressive strength, and the like of the steel sheet are seriously affected.

That is, in the case of a fire in a building, heat of 800 to 1,000 ° C is generated. The critical temperature of a low carbon steel which is generally used in a building structure is about 540 ° C., the resistance of a steel frame by heat is reduced to about 60% The tensile strength and the compressive strength inherent to the steel material constituting the structure are seriously affected and eventually the steel structure is deformed or collapsed.

Therefore, in order to solve such a problem in flame exposure, a steel structure is subjected to a fireproof coating of a top coat made of a rustproof primer and a top coat using a general paint such as a middle coat (foam type fireproof paint) And these steel structures are substantially made to have fire resistance by one half of the foamable fireproof coating.

The foamable refractory coating has a dry film thickness of several millimeters at the time of non-firing, but forms a thick heat insulating layer by foaming the dry film while being exposed to heat, and is a paint for generating an inert gas. The external heat transmitted to the steel frame is cut off due to the formation of the heat insulating layer and the generation of the inert gas and the time for the steel structure to reach the critical temperature is delayed to delay the collapse phenomenon of the building for a certain time.

However, in the conventional steel structure, the upper surface is formed by the urethane paint or the general paint on the midway formed by the foaming refractory paint as described above, and when the actual fire occurs, the urethane Or the topcoat made of general paint is instantly ignited to shorten the refractory time of the steel structure, which has a problem of seriously affecting the stability of the steel structure.

Further, due to the burning of the upper surface, uniform heat transfer made of the foamable refractory coating is not achieved, and cracks are generated when the intermediate carbonized layer is generated.

In addition, the conventional steel structure has various problems such as not only the flame propagates instantaneously along the steel structure due to the ignition of the top, but also the carbonized residues of the upper part are scattered and adversely affect the rescue work.

Open Patent Publication No. 10-2013-0125542 (Nov. 19, 2013)

An object of the present invention is to provide a non-foamable flame-retardant ceramic coating material for a steel structure fireproofing which is capable of prolonging the ignition time and the refractory time and suppressing the flame propagation by stacking the upper ceramic layer coated with the intermediate foam layer of the steel structure, And to provide a refractory coating method using the same.

Another object of the present invention is to provide a non-foamable flame-retardant ceramic paint for a steel structure refractory steel which is capable of suppressing flame propagation by extending the ignition time and the refractory time by coating the top surface of a steel structure without the use of wood, And a refractory coating method using the same.

The present invention relates to a non-foamable flame-retardant ceramic coating for a steel structure refractory coating, which is applied on an intermediate foam layer made of a foamable refractory coating to form an upper ceramic layer;

The non-foamable flame-retardant ceramic paint is characterized by comprising 10 to 30 wt% of water, 25 to 60 wt% of an inorganic nanoceramic mixture, 15 to 50 wt% of a polyurethane acrylic hybrid emulsion, 2 to 30 wt% of an inorganic colored pigment, Retarding ignition time in the event of a fire, including 1 to 10 wt% of pigment, 1 to 10 wt% of silane coupling agent, 1 to 10 wt% of water repellent agent, 0.1 to 3 wt% of film forming agent, 0.1 to 5 wt% of thickener, .

The present invention provides a composite coating film composed of a base layer, a middle foam layer and an upper ceramic layer on the base surface of a steel structure by a rustproof primer attached to a base surface of a steel structure, a foamable fireproof paint, and a nonfoamed flame retardant ceramic paint When the flame is generated, the ignition time (flame propagation) is prolonged through the integration of the reaction between the upper ceramic layer and the intermediate foam layer, so that occurrence of fire and scattering does not occur.

The upper ceramic layer according to the present invention is fixed to the surface of the intermediate foam layer to prolong the refractory time and also to reduce the peeling phenomenon of the coating film which is a drawback of the foamable refractory coating.

The non-foamed ceramic paint forming the topcoat ceramic layer according to the present invention is environmentally water-soluble so that VOC and toxic substances are not generated during the coating operation, and drying is faster than general enamel, thereby improving work efficiency.

The present invention can be applied not only to steel structures but also directly to the steel, wood, mineral board, electric power, telecommunication cables and concrete substrates to form coatings, thereby preventing or delaying the propagation of heat at high temperatures There are many effects such as the time to suppress the fire and the time to rescue the person.

Fig. 1 is an exemplary view showing the construction of a refractory coating layer according to the present invention
2 is a view showing an example of a reaction process of a non-foamable flame-retardant ceramic paint according to the present invention
3 is a photograph showing an example of a result of the first embodiment of the present invention
4 is a photograph showing an example of a result of the second embodiment of the present invention
5 is a photograph showing an example of a result of the third embodiment of the present invention

2 is a view showing an example of a reaction process of a non-foamable flame-retardant ceramic coating material according to the present invention, and FIG. 2 is a view showing an example of a non- The flame-retardant ceramic coating composition is applied to the intermediate foam layer formed on the undercoat layer of the steel structure by a foamable refractory coating to form an upper ceramic layer.

The undercoat layer is formed of a rust-preventive primer, and the rust-preventive primer is selected from an oil-modified alkyd resin-based, epoxy-based, epoxy-modified polyester-based, polyester-based for PCM or rust-inhibiting primer modified therewith .

The rust-preventive primer is applied to the base surface of the steel structure so as to have a dry film thickness of 30 to 50 mu m to form a base layer. When the dry film thickness is less than 30 탆, the undercoat layer is deteriorated in rustproofing property and adhesion force, and when the dry film thickness is more than 50 탆, the surface appearance defectiveness and economy are poor.

The undercoat layer improves interlayer adhesion, film hardness, chemical resistance, corrosion resistance, etc. between the substrate surface of the steel structure and the intermediate foam layer formed by the silica-containing foamable refractory coating.

When the foamed refractory material is exposed to heat, the dry film is carbonized and foamed at a magnification of several to several tens of times to form a thick heat insulating layer (carbonized layer) And a function of interrupting external heat transmitted to the steel frame due to the generation of inert gas and delaying the time at which the steel structure reaches the critical temperature to delay the disintegration of the building for a predetermined time. As such a foamable fire-resistant coating, any known sold sold in the market can be used, and a foamable fire-resistant coating containing an inorganic extender pigment containing silica is preferably used. Such a foamable refractory coating has a property of maintaining excellent heat resistance without lowering the density of the intermediate foamed layer when the foamed foam layer is expanded and expanded under high temperature.

The non-foamable flame-retardant ceramic paint is applied to the intermediate foam layer formed by the foamable refractory coating so as to have a dry film thickness of 30 to 60 mu m to form an upper ceramic layer having flame retardancy, fire resistance, waterproofness, water repellency and air permeability.

The upper ceramic layer formed by applying and drying the non-foamable flame-retardant ceramic coating material has fire resistance, water resistance, water repellency and air permeability and is formed integrally with the middle foam layer. In addition, when the fire occurs, It has a function of restraining the propagation of the flame by being fixed to the foam layer and a function of suppressing the occurrence of cracks in the middle foam layer.

The non-foamable flame-retardant ceramic paint is characterized by comprising 10 to 30 wt% of water, 25 to 60 wt% of an inorganic nanoceramic mixture, 15 to 50 wt% of a polyurethane acrylic hybrid emulsion, 2 to 30 wt% of an inorganic colored pigment, 1 to 10 wt% of a pigment, 1 to 10 wt% of a silane coupling agent, 1 to 10 wt% of a water repellent agent, 0.1 to 3 wt% of a film forming agent, 0.1 to 5 wt% of a thickener and 0.1 to 10 wt% of an additive.

The inorganic nanoceramic mixture having a pH of from 8 to 10 and a particle size of from 5 to 12 μm is used, and at least one of nanocollidal silica, silica sol, sodium silicate, and nano aluminum silicate is selectively added and mixed.

The polyurethane acrylic hybrid emulsion may contain 10 to 20 wt% of a polyol, 0.8 to 5 wt% of a chain extender, 4 to 10 wt% of N-methyl-pyrrolidone, 10 to 20 wt% of a diisocyanate, Dispersed polyurethane acrylic resin, which is synthesized by a core-shell type polymerization method and contains 1.5 to 8.5 wt% of a polyurethane resin, 0.8 to 2.0 wt% of a neutralizing agent, 35 to 65 wt% of water, and 0.01 to 0.5 wt% As a hybrid emulsion, it has excellent adhesion and compatibility with urethane having excellent friction resistance, rigidity and contingency.

Such a polyurethane acrylic hybrid emulsion can be obtained, for example,

(DIP) and a catalyst (Dibutyltin dilaurate, DBTDL) are added to a reactor in which nitrogen gas is introduced, and then the mixture is heated to 80 ° C. and the synthesis is carried out by an addition reaction for 3 hours.

After the first step, N-methyl-pyrrolidone (NMP) is added and stirred at a reaction temperature of 50 to 80 ° C .;

After the second step, the reaction temperature was cooled to 40 to 45 ° C., neutralized by adding triethylamine (TEA) for 30 minutes, neutralized with distilled deionized water (DDW or distilled water, DIW) To obtain an ionized prepolymer;

A fourth step of preparing a water-dispersed polyurethane by conducting a chain extension reaction for 1 hour by adding a chain extender with stirring at a reaction temperature of 50 ° C after the third step;

A fifth step of adding acrylic monomer to the water-dispersed polyurethane after the fourth step and mixing for 10 minutes;

After the fifth step, the reaction temperature was cooled to 40 to 50 ° C, neutralized by adding a neutralizing agent (Triethylamine, TEA) for 30 minutes, and then water (ion-exchanged water or distilled water) A sixth step of obtaining a prepared prepolymer;

After the sixth step, the chain extender is added to the reaction mixture while stirring at a reaction temperature of 50 ° C to progress the chain extension reaction for 1 hour.

After the seventh step, an initiator (Sodium persulfate, SPS) is dissolved in water (ion-exchanged water or distilled water) and added dropwise for 1 hour, and the mixture is heated to 70 ° C and reacted for 3 hours.

At least one of polyoxypropylene glycol (PPG), tetramethylene ether glycol (PTMEG) and dimethyol butyric acid (DMBA) is preferably used as the polyol, and tetramethylene ether glycol (PTMEG) is preferably used.

The chain extender may be selected from ethylene diamine (EDA), triethanol amine (TEOA) and trimethyolpropane (TMP). Ethylene diamine (EDA) is preferably used.

Methyl methacrylate (MMA) or 2-ethyl hexyl acrylate (2-EHAM) is used as the acrylic monomer.

The polyurethane acrylic hybrid emulsion synthesized by the polymerization method as described above has physical properties as shown in Table 1 below, has a relatively narrow particle size distribution of 0.10 to 0.35 mu m, and precipitation does not occur even after about 30 days at room temperature And excellent storage stability. In addition, since acryl is added to the polyurethane, it is possible to obtain a coating film having improved hardness while maintaining tensile strength and elongation at break similar to water-dispersed polyurethane.

In particular, the polyurethane acrylic hybrid emulsion according to the present invention can be obtained by using tetramethylene ether glycol (PTMEG) as a polyol and ethylene diamine (EDA) as a chain extender, and a polyurethane acrylic hybrid emulsion having better physical properties can be obtained.

[Table 1]

The inorganic coloring pigment may be at least one selected from the group consisting of titanium dioxide, iron oxide (red), iron oxide (yellow), iron oxide (black), chromium oxide (green), cobalt do.

The inorganic extender pigment is a mixture of at least one selected from talc, calcium bicarbonate, cray, diatomaceous earth, aluminum hydroxide, sericite, silica and barium sulfate.

The hollow pigment may be a special pigment, bentonite, perlite, silica, or the like.

The above-mentioned inorganic colored pigments, inorganic extender pigments and hollow pigments may be those known in the art as used in the upper layer of the refractory paint.

When the fire occurs, the silane coupling agent reacts with the inorganic extender pigment in the intermediate foamed layer and the organic resin in the topcoat ceramic layer as shown in FIG. 2, thereby fixing the topcoat ceramic layer to the intermediate foamed layer with the incombustible coating film , The cracks in the intermediate foamed layer are reduced, the flame propagation is suppressed, and the ignition time and the refractory time are prolonged. As such a silane coupling agent, an amino silane or an epoxy silane is used, and an epoxy silane is preferably used.

The epoxy silane has a function of inducing bonding with an inorganic extender pigment containing silica to fix the upper ceramic layer to the intermediate foam layer. As the epoxy silane, vinyl ethoxy silane, vinyl methoxy silane, methyl diethoxy silane, gamma methacryloxypropyl triethoxy silane, and gamma methacryloxypropyl trimethoxy silane can be used, Methyldiethoxysilane in which physical properties such as adhesion and storage stability are effectively exhibited is used.

When the amount of the silane coupling agent is less than 1.0 wt%, the physical properties are improved and the effect of the reaction with the inorganic extender pigment including silica is small, and if it exceeds 10 wt%, the paint storage stability becomes poor.

The water repellent agent is used for improving water repellency. For example, a water repellent agent composed of a mixture of silane and siloxane is used as a silicone water repellent agent. This water-soluble water repellent agent gradually releases the volatile substances in the middle foam layer and gradually releases the vapor from the outside, thereby reducing the peeling phenomenon of the middle foam layer, which is a defect of refractory coating, And has a function of improving durability.

The film-forming agent is used for the purpose of uniformly forming a surface film, and if it is used in an excessive amount, the drying time may be delayed.

As such a film-forming agent, a high-boiling alcohol solvent should be used. For example, 2,2,4-trimethyl-1,3-pentanediol isobutyrate (Tessanol) may be used.

The thickener is used to prevent the precipitation of the pigment during storage of the paint for a long period of time and to improve the workability by adjusting the flowability of the paint during the painting operation, and a known thickener is used.

The additive includes all known additives added to the coating material such as 0.1 to 3 wt% of a dispersant, 0.1 to 2 wt% of an antifoaming agent, 0.5 to 3 wt% of a preservative, 0.5 to 3 wt% of an antirust agent and the like. Such additives do not affect the function of the paint itself, so a detailed description thereof will be omitted.

In the non-foamable flame-retardant ceramic paint as described above,

Adding water to the container, adding additives, dispersing the mixture at 100 to 200 rpm, adding a film forming agent, and adding a part of the thickener to form a primary mixture;

Adding a coloring pigment to the primary mixture, stirring the mixture at 400 to 500 rpm for 20 to 30 minutes, adding an extender pigment and a hollow pigment, and dispersing to form a secondary mixture;

Adding a polyurethane acrylic hybrid emulsion and an inorganic nanoceramic mixture to the second mixture, and stirring the mixture at high speed for 30 to 60 minutes to produce a third mixture;

A silicone water repellent agent and a silane coupling agent are added while gradually stirring the tertiary mixture, and the remaining thickener is added and stirred. At this time, the inorganic nanoceramic mixture is mixed at a weight ratio of 1: 1 or more with respect to the polyurethane acrylic hybrid emulsion.

The non-foamable flame-retardant ceramic paint thus obtained has properties as shown in Table 2 below.

[Table 2]

Hereinafter, the refractory coating method according to the present invention will be described.

An undercoating step of applying an anticorrosive primer to the base surface of the steel structure 10 to form a undercoat layer 20;

A middle painting step of applying a foamable refractory paint on the undercoat layer to form the intermediate foam layer 30;

And a top coating step of forming an upper ceramic layer (40) by applying a nonfoamed flame-retardant ceramic paint on the intermediate foam layer, wherein the upper coating layer (50)

The non-foamable flame-retardant ceramic paint is characterized by comprising 10 to 30 wt% of water, 25 to 60 wt% of an inorganic nanoceramic mixture, 15 to 50 wt% of a polyurethane acrylic hybrid emulsion, 2 to 30 wt% of an inorganic colored pigment, 1 to 10 wt% of a pigment, 1 to 10 wt% of a silane coupling agent, 1 to 10 wt% of a water repellent agent, 0.1 to 3 wt% of a film forming agent, 0.1 to 5 wt% of a thickener, and 0.1 to 10 wt% of an additive.

Hereinafter, the present invention will be described in detail with reference to Examples.

Example 1

(Peroxide), 20 wt% of water, 20 wt% of an inorganic nanoceramic mixture, 20 wt% of a polyurethane acrylic hybrid emulsion, 5 wt% of an inorganic coloring pigment (titanium dioxide), 8 wt% of an inorganic extender pigment (silica) (Aka: Cercarone), which was composed of 5 wt% of water-repellent agent, 5 wt% of water-soluble water repellent agent, 2 wt% of film forming agent, 2 wt% of thickener agent and 1 wt% of antifoaming agent, was applied to a tinplate pannel, The ignition test for this was carried out for 40 seconds. The results are shown in FIG. 3 and [Table 3]. As the contrast agent, the alkyd enamel used as a coating agent for the top coat was used, and a polyurethane acrylic hybrid emulsion having the composition according to the following Table 4 was added.

[Table 3]

[Table 4]

As shown in FIG. 3 and Table 3, the conventional alkyd enamel paint produced flame, but the ceramic paint according to the present invention did not cause burning for 40 seconds.

Example 2

A 0.5 mm thick steel sheet was coated with a water-soluble epoxy anticorrosive paint to form a primer layer, and a foamed refractory paint (commercially available-one or two) was applied to the primer layer to form a middle foam layer. To form an upper ceramic layer. A steel sheet on which a lower layer, a middle foam layer, and an upper ceramic layer were formed was subjected to an ignition test. The results are shown in FIG. 4 and [Table 5]. At this time, the contrast group was formed with an upper ceramic layer formed by an alkyd enamel paint, and the undercoat layer and the middle foam layer were also used.

[Table 5]

As shown in FIG. 4 and Table 5, in the contrast group, ignition occurred in the upper ceramic layer in 3 seconds, but in Example 2 according to the present invention, ignition occurred in 20 seconds. It is considered that ignition occurred in the intermediate foam layer due to heat transfer rather than ignition occurred in the upper ceramic layer.

Example 3

A 3 mm steel plate was coated with a water-soluble epoxy anticorrosive paint to form a primer layer, and a foamed refractory paint (commercially available) was applied to the primer layer to form a middle foam layer. Then, the ceramic paint according to Example 1 was applied To form an upper ceramic layer. The steel sheet having the undercoat layer, the intermediate foamed layer, and the upper ceramic layer thus formed was subjected to the ignition test for 30 seconds. The results are shown in FIG. 5 and [Table 6]. At this time, the contrast group was formed with an upper ceramic layer formed by an alkyd enamel paint, and the undercoat layer and the middle foam layer were also used.

[Table 6]

As shown in FIGS. 5 and 6, the contrast group was ignited to such an extent that the combustion phenomenon was clearly distinguished. However, in Example 3 according to the present invention, the combustion phenomenon was remarkably reduced in the contrast group, In Example 3, it can be seen that the ignition time is delayed.

Also, as shown in FIG. 5, it can be seen that the middle foam layer starts expanding uniformly in the third embodiment according to the present invention when compared with the contrast group.

That is, the foamable refractory coating exhibits the heat shielding performance while the coating film is self-expanding when the coating film receives heat. When the coating film expands unevenly, cracks tend to occur, and such cracks tend to lead to penetration of heat, The non-foamed ceramic coating material according to the present invention is integrally fixed to the intermediate foam layer by reaction with the intermediate foam layer and uniformly transfers heat transfer into the middle foam layer, so that the uniform expansion of the middle foam layer .

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

(10): Steel structure (20): Lower layer
(30): Moderate foam layer (40): Top ceramic layer
(50): Composite coating layer

Claims

An intermediate foamed layer having foaming heat resistance is formed on an undercoating layer having anticorrosion property by a foamable refractory paint containing an inorganic extender pigment containing silica and a dry film thickness of 30 to 60 占 퐉 1. A non-foamable flame-retardant ceramic coating for a steel framework refractory comprising: an upper ceramic layer;
The non-foamable flame-retardant ceramic paint is characterized by comprising 10 to 30 wt% of water, 25 to 60 wt% of an inorganic nanoceramic mixture, 15 to 50 wt% of a polyurethane acrylic hybrid emulsion, 2 to 30 wt% of an inorganic colored pigment, 1 to 10 wt% of a pigment, 1 to 10 wt% of a silane coupling agent, 1 to 10 wt% of a water repellent agent, 0.1 to 3 wt% of a film forming agent, 0.1 to 5 wt% of a thickener,
The inorganic nano-ceramic mixture is mixed with the polyurethane acrylic hybrid emulsion at a ratio by weight of 1:
Wherein the inorganic nanoceramic mixture comprises at least one selected from the group consisting of nanocolloidal silica, silica sol, sodium silicate, and nano aluminum silicate having a pH of 8 to 10 and 5 to 12 m, Non - foaming flame retardant ceramic paint for steel structure refractory.

delete

The method of claim 1,
The polyurethane acrylic hybrid emulsion contains 10 to 20 wt% of a polyol, 0.8 to 5 wt% of a chain extender, 4 to 10 wt% of N-methyl-pyrrolidone, 10 to 20 wt% of a diisocyanate, 1.5 To 8.5 wt% of a filler, 0.8 to 2.0 wt% of a neutralizing agent, 35 to 65 wt% of water, and 0.01 to 0.5 wt% of an initiator.

The method of claim 3,
The polyurethane acrylic hybrid emulsion can be prepared by,
A first step of dissolving a polyol in a reactor into which nitrogen gas is introduced, adding diisocyanate and a catalyst (Dibutyltin dilaurate, DBTDL), raising the temperature to 80 ° C and conducting synthesis by an addition reaction for 3 hours;
After the first step, N-methyl-pyrrolidone (NMP) is added and stirred at a reaction temperature of 50 to 80 ° C .;
A third step of cooling the reaction temperature to 40 to 45 ° C., adding a neutralizing agent, slowly neutralizing the mixture for 30 minutes, and then adding water at a constant rate to obtain an ionized prepolymer;
A fourth step of preparing a water-dispersed polyurethane by conducting a chain extension reaction for 1 hour by adding a chain extender with stirring at a reaction temperature of 50 ° C after the third step;
A fifth step of adding acrylic monomer to the water-dispersed polyurethane after the fourth step and mixing for 10 minutes;
After the fifth step, cooling the reaction temperature to 40 to 50 DEG C, adding a neutralizing agent, slowly neutralizing the mixture for 30 minutes, and then adding water at a constant rate to obtain an ionized prepolymer;
After the sixth step, the chain extender is added to the reaction mixture while stirring at a reaction temperature of 50 ° C to progress the chain extension reaction for 1 hour.
After the seventh step, an initiator (Sodium persulfate (SPS)) was dissolved in water and added dropwise for 1 hour. After the step 8, the temperature was raised to 70 ° C and the reaction was conducted for 3 hours.
Characterized by having a particle size distribution of 0.10 to 0.35 mu m and having the physical properties shown in Table 1 below.
[Table 1]

The method according to claim 3 or 4,
At least one of polyoxypropylene glycol (PPG), tetramethylene ether glycol (PTMEG) and dimethyol butyric acid (DMBA)
The chain extender may be selected from one or more of ethylene diamine (EDA), triethanol amine (TEOA), and trimethyolpropane (TMP)
Wherein the acrylic monomer is Methyl methacrylate (MMA) or 2-Ethylhexy acrylate (2-EHAM).

The method of claim 1,
Wherein the silane coupling agent is aminosilane. The non-foamed flame retardant ceramic paint for a steel structure fireproofing furnace.

The method of claim 1,
Wherein the silane coupling agent is an epoxy silane. The non-foamed flame retardant ceramic paint for a steel structure fireproofing furnace.

delete

A lower coating step in which a rust preventive primer is applied to the base surface of the steel structure 10 to form a primer layer 20;
A middle painting step in which a foamed refractory coating is applied on the undercoat layer to form a foamed foam layer 30;
And an upper coating step in which a non-foamable flame-retardant ceramic paint according to any one of claims 1, 3, 6, and 7 is applied to the intermediate foam layer to form an upper ceramic layer (40) Refractory Coating Method Using Non - foaming Flame Retardant Ceramic Coating for Refractory.