KR101726987B1 - Low density without solvent based intumescent coating composition having fireproof and coating method thereof - Google Patents

Abstract

An eco-friendly solvent-free epoxy foamable refractory coating composition having excellent fire resistance and a coating method using the same are provided.
The eco-friendly solvent-free epoxy foamable refractory coating composition according to the present invention comprises 10 to 30 parts by weight of a bisphenol-A epoxy copolymer resin, 1 to 20 parts by weight of a silicone-modified acrylic resin for improving fire resistance, 5 to 20 parts by weight of a carbonating agent, 10 to 20 parts by weight, an acid catalyst in an amount of 10 to 40 parts by weight, a color pigment in an amount of 1 to 25 parts by weight, and an additive in an amount of 2 to 10 parts by weight.

Description

TECHNICAL FIELD [0001] The present invention relates to an eco-friendly solvent-free epoxy foamable refractory coating composition having excellent fire resistance and a coating method using the same,

The present invention relates to an eco-friendly solvent-free epoxy foamable refractory coating composition having excellent fire resistance and to a coating method using the same. More particularly, the present invention relates to an eco-friendly epoxy foamable refractory coating composition having excellent fire resistance, And more particularly, to an eco-friendly solvent-free epoxy foamable refractory coating composition and a coating method using the same, which are capable of imparting a stronger refractory performance by eliminating the desorption phenomenon of the foamed carbonized layer by forming a dense carbonized layer at the time of layer formation.

The present invention relates to an eco-friendly solvent-free epoxy foamable refractory coating composition having a refractory performance of 2 hours, more specifically, a solvent-free coating composition comprising a bisphenol-A epoxy resin and a silicone modified acrylate resin, Friendly fire-retardant epoxy foamable fire-retardant coating composition having a fire-resistant performance of 2 hours to form a dense coating film by coating to increase the water resistance.

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. Under normal conditions, there is no significant problem with durability. However, if the low carbon steel generally used in steel structures at the time of fire exceeds the critical temperature (540 ℃), the strength of steel frame is usually reduced to about 60% and the inherent tensile strength And compressive strength of the steel structure, and in the end, deformation, collapse and destruction of the steel structure occur. In order to overcome the problem of flame exposure, the steel structure is coated with fireproofing, and the construction method is required to design and construct a building which is required to satisfy the fireproof performance for 2 hours or more at the main structural parts such as beam and column .

The advantages of refractory coatings that give refractory performance to steel structures reduce the load on the steel structure, increase the rustproofing properties, provide aesthetically pleasing appearance of the exposed steel frame, and reduce maintenance and repair costs have.

Eco-friendly solvent-free foamable refractory coatings have a dry film thickness of several millimeters when exposed to fire, but form a thick insulating layer by foaming at a magnification of a few to several tens of times as the dry film is carbonized when exposed to heat to generate an inert gas. The carbonization layer blocks the external heat transmitted to the steel frame due to the formation of the insulating layer and the generation of the inert gas for a certain period of time and delays the time at which the steel structure reaches the critical temperature, .

In order to exhibit sufficient fire resistance of a foamable fire-resistant paint in the event of a fire, some basic performance is required.

First, in order to exhibit sufficient fire resistance, the refractory coating must be applied to the steel structure at a predetermined dry film thickness or more. Accordingly, when a fire occurs, a sufficient foamed carbonized layer can be formed to prevent the external temperature from being transmitted to the steel structure.

 Second, the foam height of the foamed carbonized layer should be within a certain range. In order for the fireproof paint to exhibit the fireproof performance for 2 hours, the height of the carbonized layer should be within a certain range of the dry film thickness so that the poor thermal insulation performance due to low foaming, the collapse and detachment of the carbonized layer due to excessive foaming can be prevented have.

 Third, in order to maintain effective thermal insulation performance and carbonization layer for 2 hours, the density of the foamed carbonized layer must be high. If the density of the carbonized layer is low even if the height of the foamed carbonized layer is low, it is impossible to effectively block the penetration of the external heat in the event of a fire. Further, Can not be expected.

 Fourth, when the dried film is exposed to external heat, foams should be formed. If the foam is irregularly formed at the time of foaming of the refractory paint, cracks are generated due to the non-uniformization of the final carbonized layer, and external heat penetrates into the cracked portion at this time to prevent the entire steel structure from being protected.

On the other hand, gypsum and nitrite spraying materials are mainly used as coating materials having a fire resistance performance of 2 hours which can satisfy the building method up to now, and recently, aqueous inorganic coating materials have been used in the field. However, in the case of gypsum and nitrate sprayed materials, dust is generated during operation, the outer appearance of the work is poor, the adhesion force with the steel structure is poor, and peeling phenomenon occurs after the construction, and air purification, Maintenance and so on, the user is avoiding the use of the sprayed material.

As a coating material having fire resistance performance, a composition having a fire resistance performance of 2 hours by using a silicate-based resin in the case of an inorganic coating material is disclosed in Korean Patent Registration No. 10-0590502 as a foamable fire-resistant coating composition. The coating composition relates to a composition having a refractory performance of 2 hours using a silicate compound and a molar ratio controlling agent, which are inorganic, and US Patent No. 5,401,793 discloses a composition containing various kinds of inorganic compounds, a synthetic resin and a phosphorus and / A used foamable refractory coating composition has been disclosed. However, the inorganic refractory coating compositions of Korean Patent No. 10-0590502 and US Patent No. 5,401,793 have poor water resistance and poor adherence to the coated body, resulting in peeling of the coating film after drying and swelling of the dried film due to gas generation And the like.

On the other hand, an aqueous foamable refractory coating composition which does not use an organic solvent is disclosed in Japanese Laid-Open Patent Publication No. 2004-107063, and the foamable refractory coating composition is a refractory coating composition using a foamable refractory powder, a powdered resin and an emulsion synthetic resin, The above-mentioned refractory coating composition should be applied on a dry material such as a wet material such as a semi-dry rock wool, an aluminum hydroxide, and an asbestos slate plate and a gypsum board, which is a non-foamable fireproof clone, In addition, there is a problem in that the foamed refractory sheet is applied to the front surface of the foamed refractory sheet, and thus the operation is troublesome.

In addition, in the case of an oily foamable refractory paint other than an aqueous based paint, a composition in which the refractory performance is limited to 1 hour is disclosed in Korean Patent Publication No. 2002-0083750, "A foamable refractory coating composition and a method for imparting fire resistance to the composition using the same And the resulting refractory coating composition is a composition using an oil-based alkyl-modified acrylic resin and an acrylic microgel resin, and is a low shrinkage-based foamable refractory coating composition which is applied to the surface of a steel structure or the like to exhibit fire resistance. Although the refractory coating composition can be applied as a refractory clone for 1 hour according to the fire resistance test method, there is a problem that the refractory performance is short at the present time when the building is going to be a high-rise building.

Accordingly, the density and strength of the foamed carbonized layer of an environmentally friendly solvent-free epoxy foamable refractory coating are improved, and it is utilized in steel, wood, mineral board, electric power, communication cable and concrete. It is urgently required to develop a low-density environmentally friendly non-solvent refractory coating composition having a fire resistance performance of 2 hours which provides a time for suppressing a fire and a time for rescuing human life.

Accordingly, a problem to be solved by the present invention is to realize a superior foamed carbonized layer density by using a bisphenol-A epoxy resin and a silicone modified acrylate resin, suppressing the desorption of a carbonized layer during a fire, Resistant fire resistant coating composition having a fire resistance performance of a low-density environmentally friendly non-solvent.

Another object to be solved by the present invention is to provide a coating method for applying to an H-shaped steel using an undercoating paint, the above environmentally friendly solvent-free epoxy foamable refractory coating composition and an overcoating paint.

In order to solve the above problems, the present invention provides a resin composition comprising 10 to 30 parts by weight of a bisphenol-A epoxy copolymer resin, 1 to 20 parts by weight of a silicone-modified acrylic resin for improving fire resistance, 5 to 20 parts by weight of a carbonating agent, 10 to 40 parts by weight of an acid catalyst, 1 to 25 parts by weight of a color pigment, and 2 to 10 parts by weight of an additive, based on 100 parts by weight of the total amount of the composition.

According to an embodiment of the present invention, the bisphenol-A epoxy resin has an average molecular weight of 8,000 to 20,000 and a glass transition temperature (Tg) of 50 ° C to 150 ° C.

The present invention also relates to a method for coating a steel sheet, comprising the steps of: applying a primer containing an anticorrosive paint on an H-beam; Applying a refractory coating composition according to any one of claims 1 to 3 on the undercoat to form an intermediate layer; And applying a topcoat on the middle surface to form a topcoat.

According to one embodiment of the present invention, the middle layer has a thickness of 10 to 12 mm or more by applying the refractory coating composition according to any one of claims 1 to 3 three to four times.

The refractory coating composition according to the present invention is a low-density environmentally friendly non-solvent refractory coating composition having a refractory performance of 2 hours, which is composed of a bisphenol-A epoxy copolymer polymer and a silicone modified acrylate polymer and is a Korean Industrial Standard KS F 2257-1, According to the fire resistance test method of building structure specified in 6, 7, it can be applied as fireproof cover material for steel beams and columns for two hours, exhibits excellent fire resistance performance, forms a dense carbonized layer at the time of forming a foamed carbonized layer There is no desorption phenomenon of the foamed carbonized layer and a more powerful fireproof performance can be given.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view of an H-shaped steel plate coated with a lower, middle and upper planes.
Fig. 2 is a cross-sectional view of the H-section steel coated with the lower, middle and upper planes.

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

The following examples are intended to illustrate the present invention and should not be construed as limiting the scope of the present invention. Accordingly, equivalent inventions performing the same functions as the present invention are also within the scope of the present invention.

In addition, in adding reference numerals to the constituent elements of the drawings, it is to be noted that the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, the eco-friendly solvent-free epoxy foamable refractory coating composition of the present invention will be described in more detail.

The resin used as the vehicle of the present invention is a bisphenol-A epoxy resin that exhibits durability and fineness at room temperature conditions and can impart weatherability and plasticity. When exposed to a high temperature in the event of a fire, it imparts fluidity to the dried film, Thereby preventing external leakage of the foaming gas when the gas is generated, and effectively forming the initial foam layer.

According to an embodiment of the present invention, the bisphenol-A epoxy resin has a weight average molecular weight of 8,000 to 20,000. When the weight average molecular weight is less than 8,000, the abrasion resistance and water resistance of the dry film become poor, and the foamed carbonized layer becomes abnormally large, so that it is difficult to form an even foam when a fire occurs. When the average molecular weight exceeds 20,000, The fire resistance deteriorates. If the composition of the bisphenol-A epoxy resin is 10 parts by weight or less based on the total weight of the composition, the foaming gas leaks to the outside of the carbonized layer in the initial foam layer forming step, The carbonization layer is desorbed in the foam layer formation step, which is not preferable. Therefore, the content of the bisphenol-A epoxy-based copolymer resin is 10 to 30 parts by weight. Further, the glass transition temperature (Tg) of the composition according to an embodiment of the present invention is preferably 50 ° C. to 150 ° C. If the glass transition temperature is lower than the above temperature, it is difficult for the composition to maintain a constant thickness upon application, When the temperature is higher than the above range, there is a problem that it is difficult to apply the coating solution over a wide area.

The present invention uses a silicone modified acrylate resin, which is a refractory performance improving resin, as a method for maintaining the above-mentioned purpose, that is, the fire resistance performance for 2 hours. This is because, by using the above-mentioned components as a component which is a characteristic component of the present invention, an eco-friendly solvent-free epoxy foamable refractory coating having a fire resistance for 2 hours has the effect of enhancing the density of the carbonized layer and reducing the desorption phenomenon of the carbonized layer with the steel structure Can be obtained.

The silicone intermediates required to prepare the silicone modified acrylate resins are Z-6018, DC-3074 (DOW CORNING), SILRES SY-231, SILRES SY-300 (WACKER), TSR160, TSR165, TSR170 and TSR175 (GE DOSHIBA) It is used in an amount of 1 to 20 parts by weight based on the weight of all the monomers excluding the solvent. The acrylate resin may also be selected from the group consisting of styrene, butylacrylate, methylmethacrylate, 2-hydroxyethylacrylate, 2-hydroxymethylmethacrylate (2 Monomers having functional groups of dimethylaminoethylmethacrylate, glycidylmethacrylate, acrylic acid and methacrylic acid are copolymerized in the presence of a suitable initiator, , And the mixture of one or more acrylate resins is used in an amount of 60 to 90 parts by weight based on the weight of all the monomers except the organic solvent. (Meth) acryloxypropyltrimethoxysilane, 3- (meth) acryloxypropylmethyldimethoxysilane, which is a silicone monomer in the presence of the above-listed acrylates, 3- (meth) acryloxypropyltrimethoxysilane, , 3- (meth) acryloxypropyltriisopro phenoxysilane, Vinyltrimethoxysilane, Vinyltriethoxysilane, and Vinyltrichlorosilane (Vinyltrimethoxysilane). ) Is used in an amount of 1 to 20 parts by weight based on the weight of all the monomers except the organic solvent.

In the presence of the above-mentioned acrylate, silicon increases the heat resistance of the acrylic resin and increases the density of the foamed carbonized layer and improves the adhesion between the carbonized layer and the steel structure at the time of foaming, so that the foamed fireproof coating can maintain the fireproof performance for 2 hours do. The epoxy resin is mixed with the bisphenol-A epoxy resin in an appropriate ratio. The silicone-modified acrylate resin is uniformly dispersed in the bisphenol-A epoxy resin during the formation of the dry film to improve the water resistance and adhesion of the dry film, It helps the uniform foam formation in the event of fire, prevents the detachment of carbonized layer by excessive foaming, increases the density inside the carbonized layer, and improves the fire resistance performance. The silicone-modified acrylate resin for improving the fire resistance is used in an amount of 1 to 20 parts by weight based on the entire coating composition. If the amount is less than 1 part by weight, the carbonization layer is excessively removed due to excessive foaming at the time of foaming, and the densification and density are not expected to be expected. When the amount is more than 20 parts by weight, So that the heat insulating effect can not be expected.

The foaming agent thermally decomposes at a high temperature to release an inert gas, thereby foaming the carbonized layer of the refractory paint film to continue the adiabatic effect. Such blowing agents include nitrogen compounds selected from melamine, guanidine, urea, glycine and dicyandiamide, and 10 to 20 parts by weight of the total composition is used. If the amount is less than 10 parts by weight, the amount of gas generated is small. Therefore, the carbonized layer is insufficient to foam, which is undesirable. If the amount is more than 20 parts by weight, the amount of gas generated increases, , It is difficult to form a uniform carbonized layer, so that the refractory performance can not be expected.

The carbonating agent reacts with the foaming agent at a high temperature to form a carbonized layer exhibiting a fire resistance performance. Chemical substances used as such carbonizer include monopentaerythritol, dipentaerythritol, tripentaerythritol, starch, phenolformaldehyde resin, sugar ( Sugar and polyurethane are used in an amount of 5 to 20 parts by weight in the whole coating composition. If the amount of the carbonizing agent is less than 5 parts by weight based on the total weight of the composition, the chemical reaction with the foaming agent is weak and the formation of the carbonized layer is insufficient. If the amount is more than 20 parts by weight, the foaming effect is remarkably decreased, .

The acid catalyst is thermally decomposed at high temperature to release the gas, thereby promoting the reaction of the carbonizing agent to form a carbonized layer and also affecting the foaming of the carbonized layer. Examples of the acid catalyst include primary ammoniumphosphate, secondary ammoniumphosphate, ammoniumphosphite, amine / amidephosphate, aminesulfate, melaminephosphate, , Melamine pyrophosphate, melaminepoly phosphate, tricrecylphosphate and trichloroalkylphosphate can be used as the organic solvent in the present invention. In the present invention, the acid catalyst is mixed with one kind or another acid catalyst and used in an amount of 10 to 40 parts by weight in the total coating composition. When the amount of the acid catalyst to be used is less than 10 parts by weight, the reaction with the carbonating agent and the foaming agent is not appropriate and the formation amount of the mineral acid is insufficient. Therefore, the amount of the carbonized layer is not preferable, The foaming effect is undesirably deteriorated. Therefore, the content of the acid catalyst is 10 to 40 parts by weight.

Colored pigments are generally added in order to give the final color of the coating, which is applied in foaming refractory coatings in order to confirm the homogeneous mixing of the base and the curing agent. These colored pigments are used in an amount of 1 to 25 parts by weight use.

As the additive, at least one of a thickener, a dispersant, a defoamer, and a plasticizer is used and 2 to 10 parts by weight based on the total weight of the total composition is used in order to maintain an optimum coating condition and a coating condition.

In the case of general oil-based foamable fire-resistant paints, it is pointed out that the fire-resistant time for protecting the steel structure at the time of fire is limited to 1 hour. The present invention is capable of maintaining a fire-resistant time of 2 hours or more as a high density foaming fire- . In order to be able to withstand the refractory time of more than 2 hours, it is necessary to solve the problem of the desorption of the foamed carbonized layer and the insufficient effect of insulation due to the low density of the carbonized layer, which is a problem of the conventional oil- do.

Accordingly, the present invention provides a high-density oily foamable refractory material capable of maintaining the refractory application time for more than 2 hours by applying a silicone-modified acrylate resin to solve the problems of the conventional oily foamable refractory material.

Hereinafter, the effects of the fire resistance of the composition according to the present invention will be described in detail.

Test Example

Fire resistance performance test

    This test is to confirm the fireproof performance after painting the refractory part of the steel structure such as general buildings, factory buildings, dangerous materials storage and treatment facilities,

Twelve thermocouples were installed on the H-beam in accordance with KS F-2257-6, 7, and then the refractory was painted and heated for 2 hours under the standard heating temperature conditions specified in KS F-2257-1 , It is a method for evaluating to what extent the foamed carbonized layer of the refractory coating effectively interrupts the external temperature to the H-shaped steel pipe, which is the pipe. At this time, the standard heating test shall be carried out by the KOLAS accreditation body which can meet the standard heating condition of KS F 2257-1 and the specimen specification of KS F-2257-6,7. KS F-2257-1,6,7 Thermocouple spiral shall be less than 0.5 mm in diameter and at least 3 to 4 thermocouples shall be used in the test of beam and column and the number of thermocouples to be measured shall be 3 ~ .

In this test, twelve thermocouples were installed in each test body as specified in KS F 2257-6, 7, and the temperature of each part was measured.

In addition, this test is a test for confirming the applicability of the above-mentioned refractory coating material as a fireproof coating material for 2 hours, and the fire resistance performance for 2 hours specified in Annex 2 of KS F 2257-6, When the average temperature of the steel is 538 ° C or less and the maximum temperature of the measurement temperature is 649 ° C or less for 2 hours, it becomes a refractory paint which can be applied as a fireproof coating material for 2 hours.

Test Items Example 1 Example 2 Example 3 Remarks Crack in dry film Good Good Good Visual observation Fire resistance performance
Test (℃) 10 minutes 52 51 52 Test conditions KS F 2257-1
(Average temperature) 20 minutes 119 120 120 30 minutes 168 167 170 40 minutes 208 215 212 50 minutes 239 250 245 60 minutes 262 270 263 70 minutes 293 283 293 80 minutes 318 303 310 90 minutes 358 340 350 100 minutes 390 372 380 110 minutes 430 410 420 120 minutes 465 460 445 Fire resistance performance test
Carbonization layer desorption none none none Visual observation Density of carbonized layer Great Great Great Visual observation Strength of carbonized layer Great Great Great Touch-up observation Cracking of carbonized layer none none none Visual observation

From the results of the above Table 1, it can be seen that the eco-friendly solvent-free epoxy foamable refractory coating compositions (Examples 1, 2 and 3) obtained by using the bisphenol-A epoxy resin produced by the present invention, The strength, and the cracked portion of the carbonized layer. Particularly, the desorption phenomenon does not occur at the time of forming the foamed carbonized layer of the dry film, so that the effect of insulating the steel structure for 2 hours is excellent.

Hereinafter, a coating method using an eco-friendly solvent-free epoxy foamable refractory coating composition having a fire resistance of 2 hours according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view of an H-shaped section coated with a lower section, a middle section and a top section, and FIG. 2 is a sectional view of an H section steel coated with a lower section, a middle section and a upper section.

    Referring to FIG. 1, a structure according to a coating method using a low density environmentally friendly solvent-free foamable refractory coating composition according to an embodiment of the present invention includes: an H-shaped steel 10 having a surface treated; A middle ground 30 coated with the refractory coating composition of the present invention on the lower ground 20 and a top coat 40 using the topcoat according to the construction conditions on the middle ground 30.

 The H-shaped steel is subjected to a surface treatment according to SSPC-SP10 and SSPC-SP6 to remove foreign matter on the surface of the H-shaped steel and is painted with a rust-preventive paint so as to have a dry film thickness of 0.05 mm or more, The coating is applied 3 to 4 times with the low density environmentally friendly solvent-free foamable refractory coating composition of the present invention to form a middle layer having a dry film thickness of 10 to 12 mm or more on the primer layer. In the environmentally friendly solvent-free foamable refractory coating, Since it is 3 ~ 3.5 mm, it is necessary to coat 3 ~ 4 times more to get the desired fire resistance performance. In addition, depending on the application conditions, topcoat is determined to form a topcoat having a dry film thickness of 0.05 mm or more.

The fire-resistant film of the present invention has a fireproof performance of 2 hours or more when a fire-resistant film is formed to have a dry film thickness of 10 to 12 mm after the coating of a steel structure and a dry film thickness after drying. In this case, the coating method is not particularly limited, but methods such as airless spray coating, roller coating, and manual painting can be used.

The eco-friendly solvent-free epoxy foamable refractory coating composition having the fire resistance for 2 hours obtained in the above example was applied to the steel structure and the steel columns and pillars of the general buildings by the fire resistance test method according to the Building Act and the Ministry of Construction and Transportation Notice No. 2005-122 It can be used for two hours fireproof structure, and it can be used in all places where fire resistance performance is required, such as ships, offshore structures, hazardous material storage facilities, and flammable material storage.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (4)

10 to 30 parts by weight of a bisphenol-A epoxy copolymer resin, 1 to 20 parts by weight of a silicone-modified acrylic resin for improving fire resistance, 5 to 20 parts by weight of a carbonizing agent, 10 to 20 parts by weight of a foaming agent, 1 to 25 parts by weight of a coloring pigment and 2 to 10 parts by weight of an additive,
The bisphenol-A epoxy resin has a weight average molecular weight of 8,000 to 20,000, a glass transition temperature (Tg) of 50 to 150 ° C,
The silicone-modified acrylic resin is dispersed among the bisphenol-A epoxy resin to help uniform formation of the initial foam at the time of fire occurrence. It prevents the detachment of the carbonized layer by over-foaming and increases the density inside the carbonized layer, Which is characterized by improving the performance of the low-density eco-friendly fire-resistant coating composition of the present invention. delete Applying a primer containing an anti-corrosive coating on the H-shaped steel;
Applying a refractory coating composition according to claim 1 on the primer to form an intermediate layer; And
And applying a topcoat on the middle surface to form a topcoat. The method of claim 3,
Wherein the intermediate layer is coated with the refractory coating composition according to claim 1 three to four times to have a thickness of 10 to 12 mm or more.

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