Inorganic coating composition for preventing fire spread and method for preparing the same

Abstract

The present invention relates to a fire spread prevention inorganic coating composition comprising an alkali metal silicate, an alkali metal hydroxide, an inorganic acid, a boron-containing compound, an organosilane compound, a thickener, and water, and a method for manufacturing the same.

Description

Technology Field

[0001] The present invention relates to a fire spread prevention inorganic coating composition and a method for manufacturing the same. Background Technology

[0002] Due to recent repeated fire accidents, interest in the fire safety of structures closely related to daily life is increasing, and research on technologies to delay or prevent the spread of fire is continuously underway.

[0003] Among these, in the field of fire prevention using organic materials, halogen compounds (Cl, Br, F, etc.) and phosphorus compounds are added to delay fires. However, while the above organic materials are effective in reducing direct damage caused by fire by delaying the fire time, they have problems such as causing serious aftereffects like suffocation and pneumoconiosis due to the excessive release of toxic gases. In particular, halogen compounds produce toxic gases and dioxins that are fatal to the human body when burned. Therefore, the use of inorganic materials has recently increased in order to improve the release of such toxic gases and flame retardant effects.

[0004] Meanwhile, Korean Patent Publication No. 10-2008-0070485 is presented as a similar prior art document regarding this. Prior art literature

[0005] Republic of Korea Published Patent Application No. 10-2008-0070485 (July 30, 2008) The problem to be solved

[0006] To solve the above-mentioned problems, the present invention aims to provide a fire spread prevention inorganic coating composition that can be coated on a metal or a heat-transmitting medium to effectively delay or prevent the spread of fire, and a method for manufacturing the same.

[0007] However, the above purpose is exemplary, and the technical concept of the present invention is not limited thereto. means of solving the problem

[0008] One aspect of the present invention for achieving the above objective relates to a fire spread prevention inorganic coating composition comprising an alkali metal silicate, an alkali metal hydroxide, an inorganic acid, a boron-containing compound, an organosilane compound, a thickener, and water.

[0009] In the above embodiment, the alkali metal silicate may satisfy the following chemical formula 1.

[0010] [Chemical Formula 1]

[0011] (x1Li2O+x2Na2O+x3K2O)·ySiO2·nH2O

[0012] (In the above chemical formula 1, x1 is the number of moles of Li2O, x2 is the number of moles of Na2O, x3 is the number of moles of K2O, y is the number of moles of SiO2, and n is a natural number from 1 to 20,

[0013] The mole ratio of (x1+x3) / x2 is a real number between 0.7 and 1.3.

[0014] In the above embodiment, the chemical formula 1 of the alkali metal silicate may satisfy the following relationship 1.

[0015] [Relationship 1]

[0016] 0.8 ≤ (x1+x2) / x3 ≤ 1.2

[0017] (In the above Equation 1, x1 is the number of moles of Li2O, x2 is the number of moles of Na2O, and x3 is the number of moles of K2O.)

[0018] In the above embodiment, the inorganic acid may be phosphoric acid, hydrochloric acid, nitric acid, or carbonic acid.

[0019] In one embodiment above, the boron-containing compound may be one or more selected from the group consisting of borax, sodium borate, sodium metaborate, boric acid, and boron oxide.

[0020] In one embodiment above, the organosilane compound may satisfy the following chemical formula 2.

[0021] [Chemical Formula 2]

[0022] Si(R1) x (OR2) 4-x

[0023] (In the above Chemical Formula 1, R1 and R2 are independently linear or branched alkyl groups, and x is a real number from 0 to 3.)

[0024] In the above embodiment, the thickener may be one or more selected from the group consisting of inorganic thickeners, cellulose-based compounds, protein-based compounds, alginic acid-based compounds, polyvinyl-based compounds, polyacrylic acid-based compounds, and polyether-based compounds.

[0025] In addition, another aspect of the present invention relates to a method for preparing a fire-spreading prevention inorganic coating composition comprising the step of mixing an alkali metal silicate, an alkali metal hydroxide, an inorganic acid, a boron-containing compound, an organosilane compound, a thickener, and water.

[0026] In addition, another aspect of the present invention relates to a method for manufacturing a fire spread prevention coating film, comprising: a) a step of coating or impregnating a substrate with the aforementioned fire spread prevention inorganic coating composition; and b) a step of heat treating. Effects of the invention

[0027] The fire spread prevention inorganic coating composition according to the present invention comprises an alkali metal silicate, an alkali metal hydroxide, an inorganic acid, a boron-containing compound, an organosilane compound, and a thickener, so that when the inorganic nano-coating composition is coated on a metal or a heat-transmitting medium or impregnated into a fiber, the spread of fire can be effectively delayed or prevented.

[0028] In addition, by appropriately adjusting the molar ratio of alkali metals within the alkali metal silicate, there is an advantage in that the durability and aesthetics of the coating layer can be further improved when coated on a medium. Brief explanation of the drawing

[0029] FIG. 1 is a photograph of each sample after heating to a temperature above the melting point of a sample (a) not coated with an inorganic nanocoating composition according to one example of the present invention and a sample (b) coated with Example A to a thickness of 3 μm. FIG. 2 is a photograph of a paper pulp material (a) impregnated with Example A according to one example of the present invention, an impregnated paper pulp material (b) exposed to high temperature, and an impregnated paper pulp material (c) completely combusted. FIG. 3 is a photograph of the heating section (front section) (a), middle section (b), and rear section (c) respectively after heating the aluminum / impregnated paper pulp material / aluminum laminate with the impregnated wiper material inserted in the middle. Specific details for implementing the invention

[0030] The fire spread prevention inorganic coating composition according to the present invention and the method for manufacturing the same will be described in detail below. The drawings presented below are provided as examples to ensure that the concept of the present invention is sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the drawings presented below and may be embodied in other forms, and the drawings presented below may be exaggerated to clarify the concept of the present invention. Unless otherwise defined, technical and scientific terms used herewith have the meaning commonly understood by those skilled in the art to which this invention pertains, and descriptions of known functions and configurations that could unnecessarily obscure the essence of the present invention are omitted in the following description and accompanying drawings.

[0031] One aspect of the present invention relates to a fire spread prevention inorganic coating composition comprising an alkali metal silicate, an alkali metal hydroxide, an inorganic acid, a boron-containing compound, an organosilane compound, a thickener, and water.

[0032] As such, the fire spread prevention inorganic coating composition according to the present invention comprises an alkali metal silicate, an alkali metal hydroxide, an inorganic acid, a boron-containing compound, an organosilane compound, and a thickener, so that when the inorganic nano-coating composition is coated on a metal or a heat-transmitting medium or impregnated into a fiber, the spread of fire can be effectively delayed or prevented.

[0033] In addition, by appropriately adjusting the molar ratio of alkali metals within the alkali metal silicate, there is an advantage in that the durability and aesthetics of the coating layer can be further improved when coated on a medium.

[0034] In particular, when the medium is metal, the metal without any coating becomes fluid and flows down or significantly increases heat conduction to the surroundings when heated to a temperature above its melting point, whereas the metal coated with the inorganic coating composition according to the present invention has the advantage of preventing flow by forming a new oxide layer even when heated to a temperature above its melting point, and effectively preventing heat diffusion and fire.

[0035] When coating with such an inorganic coating composition, the thickness of the coating may be 1 μm or more, specifically 1 to 100 μm. In addition, when applied by impregnation to fibrous materials such as paper pulp, the weight increase after moisture evaporation may be 2 g / 100 cm² or more, specifically 2 to 100 g / 100 cm².

[0036] Hereinafter, each component of the fire spread prevention inorganic coating composition according to one example of the present invention will be described in more detail.

[0037] In one example of the present invention, the alkali metal silicate comprises lithium silicate, sodium silicate, and potassium silicate, and more specifically, for example, the alkali metal silicate may satisfy the following chemical formula 1.

[0038] [Chemical Formula 1]

[0039] (x1Li2O+x2Na2O+x3K2O)·ySiO2·nH2O

[0040] In the above chemical formula 1, x1 is the number of moles of Li2O, x2 is the number of moles of Na2O, x3 is the number of moles of K2O, y is the number of moles of SiO2, and n is a natural number from 1 to 20, and the molar ratio of (x1+x3) / x2 is a real number from 0.7 to 1.3. More preferably, the molar ratio of (x1+x3) / x2 may be a real number from 0.8 to 1.2, and even more preferably a real number from 0.9 to 1.2. In addition, the molar ratio of y / (x1+x2+x3) may be 2.5 to 5.0, and more preferably 3.5 to 3.8. Within this range, the area of ​​whitening is small, so the appearance can be excellent when applying a fire spread prevention coating.

[0041] By using alkali metal silicates to have a molar ratio that satisfies this, the fire spread delay and prevention effect can be effectively achieved when coated with an inorganic coating composition, and the durability and aesthetics can be more effectively improved when coated on a medium.

[0042] In the M2O (Li2O+Na2O+K2O) of the above alkali metal silicate, the volume expansion of oxides formed at high temperatures of 150°C or higher is greater in the order of Na2O > K2O > Li2O. Accordingly, it is desirable to add more Na2O than K2O and Li2O, but there is a problem where surface issues occur as the amount of Na2O added increases. To prevent and solve such problems, increasing the amount of K2O added can ensure stability in maintaining the composition, and in the case of Li2O, durability can be secured with a relatively small amount as it is a necessary element for improving water resistance and durability.

[0043] Such alkali metal silicates can be added in an amount of 50 to 90 weight% based on the total weight of the inorganic coating composition, more preferably 60 to 87 weight%, and even more preferably 70 to 85 weight%.

[0044] In one example of the present invention, the alkali metal hydroxide is added to improve the water solubility of the alkali metal silicate, and specifically, it may be one or more selected from the group consisting of lithium hydroxide, sodium hydroxide, and potassium hydroxide, and the hydroxide most preferred for the inorganic coating composition may be potassium hydroxide. Such alkali metal hydroxide may be added in an amount of 0.001 to 5 weight% with respect to the total weight of the inorganic coating composition, more preferably 0.01 to 3 weight%, and most preferably 0.05 to 0.5 weight%, but since the alkali metal of the alkali metal hydroxide affects the molar ratio of (x1+x3) / x2, it is desirable to adjust the content so that the molar ratio of (x1+x3) / x2 satisfies an appropriate range.

[0045] In one example of the present invention, the inorganic acid is an inorganic acid excluding boric acid of a boron-containing compound, and specifically, for example, phosphoric acid, hydrochloric acid, nitric acid, or carbonic acid may be used. Such an inorganic acid may be added in an amount of 0.01 to 5 weight% with respect to the total weight of the inorganic coating composition, more preferably in an amount of 0.05 to 3 weight%, and most preferably in an amount of 0.1 to 1 weight%.

[0046] In one example of the present invention, the boron-containing compound is a compound containing boron (B), specifically, it may be one or more selected from the group consisting of, for example, borax, sodium borate, sodium metaborate, boric acid, and boron oxide, and the most preferred boron-containing compound in the inorganic coating composition may be borax. By adding this, the stability and chemical resistance of the coating surface during low-temperature drying or natural drying can be improved. Such a boron-containing compound may be added in an amount of 0.01 to 5 weight% with respect to the total weight of the inorganic coating composition, more preferably in an amount of 0.05 to 3 weight%, and most preferably in an amount of 0.1 to 1 weight%.

[0047] In one example of the present invention, the organosilane compound is intended to improve spreadability during coating and ensure superior water resistance, and specifically, for example, may satisfy the following chemical formula 2.

[0048] [Chemical Formula 2]

[0049] Si(R1) x (OR2) 4-x

[0050] (In the above Chemical Formula 1, R1 and R2 are independently linear or branched alkyl groups, and x is a real number from 0 to 3.)

[0051] As a more specific example, the organosilane compound may be one or more selected from the group consisting of tetramethoxysilane, tetraethoxysilane, tetrabutoxysilane, tetrapropoxysilane, tetraisopropoxysilane, tetraisobutoxysilane, trimethoxymethylsilane, triethoxyethylsilane, tripropoxypropylsilane, dimethoxydimethylsilane, dimethoxydiethylsilane, diethoxydimethylsilane, diethoxydiethylsilane, and dipropoxydipropylsilane, and preferably may be tetraethoxysilane (TEOS).

[0052] The above-mentioned organosilane compound may be added in an amount of 0.01 to 5 weight% based on the total weight of the inorganic coating composition, more preferably in an amount of 0.05 to 3 weight%, and most preferably in an amount of 0.1 to 1 weight%. Within this range, sufficient spreadability and water resistance improvement effects can be secured.

[0053] In one example of the present invention, the thickener is intended to improve the viscosity of an inorganic coating composition to enhance ease of coating or impregnation, and may be used without particular limitation as long as it is commonly used in the art; specifically, for example, one or more selected from the group consisting of inorganic thickeners, cellulose-based compounds, protein-based compounds, alginic acid-based compounds, polyvinyl-based compounds, polyacrylic acid-based compounds, and polyether-based compounds may be used. As a more specific example, the thickener may be bentonite, zeolite, montmorillonite, hectorite, diatomaceous earth; methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, methylhydroxypropylcellulose, alpha-cellulose, beta-cellulose, gamma-cellulose, casein, sodium caseinate, ammonium caseinate; alginate, sodium alginate; It may be one or more selected from the group consisting of polyvinyl alcohol, polyvinylpyrrolidone, polyvinylbenzyl ether copolymer; polyacrylic acid, polymethacrylic acid, polymethylacrylic acid, polymethylmethacrylic acid; and polyether, but is not necessarily limited thereto.

[0054] The content of such a thickener can be adjusted according to the viscosity of the inorganic coating composition, and as a non-limiting example, it can be added in an amount of 0.01 to 5 weight% with respect to the total weight of the inorganic coating composition, more preferably in an amount of 0.05 to 3 weight%, and most preferably in an amount of 0.1 to 1 weight%. Within this range, coating or impregnation is easy, and processability can be improved.

[0055] In one example of the present invention, the water is added to dissolve the alkali metal silicate and alkali metal hydroxide and to control the content of the solids, and the water may be added in an amount of 5 to 30 weight%, more preferably 10 to 25 weight%, and even more preferably 12 to 25 weight% based on the total weight of the inorganic coating composition, but is not necessarily limited thereto.

[0056] In addition to this, the inorganic coating composition according to one example of the present invention may further include one or more selected from the group consisting of inorganic acidic agents, dispersants, and catalysts, as needed.

[0057] In addition, another aspect of the present invention relates to a method for manufacturing the aforementioned fire spread prevention inorganic coating composition, specifically, for example, a method comprising the step of mixing an alkali metal silicate, an alkali metal hydroxide, an inorganic acid, a boron-containing compound, an organosilane compound, a thickener, and water.

[0058] At this time, since the components and content of the fire spread prevention inorganic coating composition are the same as those described above, a redundant description is omitted, and the mixing of the two can be performed in a conventional manner.

[0059] In addition, another aspect of the present invention relates to a method for manufacturing a fire-spreading prevention inorganic coating film using the aforementioned fire-spreading prevention inorganic coating composition, specifically, for example, a) a step of coating or impregnating a base material with a fire-spreading prevention inorganic coating composition; and b) a step of heat treatment; and a method for manufacturing a fire-spreading prevention coating film.

[0060] At this time, since the components and content of the fire spread prevention inorganic coating composition are the same as those described above, a redundant description is omitted, and the mixing of the two can be performed in a conventional manner.

[0061] Once the fire spread prevention inorganic coating composition is prepared, it can be coated onto a metal or a heat-transmitting medium, or impregnated into a fiber, as described above. When coating onto a medium, the thickness of the coating may be 1 μm or more, specifically 1 to 100 μm. Additionally, when applied by impregnation onto a fibrous material such as paper pulp, the weight increase after moisture evaporation may be 2 g / 100 cm² or more, specifically 2 to 100 g / 100 cm².

[0062] Next, a coating film, which is an oxide film, can be formed by heat treatment. Specifically, the heat treatment can be performed at 80 to 120°C, and more preferably at 90 to 100°C. Within this range, an oxide film can be effectively formed without whitening occurring.

[0064] Hereinafter, the fire spread prevention inorganic coating composition according to the present invention and the method for manufacturing the same will be explained in more detail through examples. However, the following examples are merely for reference to explain the present invention in detail, and the present invention is not limited thereto and can be implemented in various forms.

[0065] Furthermore, unless otherwise defined, all technical and scientific terms have the same meaning as generally understood by one of the art to which the present invention pertains. The terms used in the description herein are merely for the purpose of effectively describing specific embodiments and are not intended to limit the present invention. Additionally, units of additives not specifically stated in the specification may be in weight percent.

[0066] [Examples A to E]

[0067] An inorganic coating composition was prepared by mixing sodium silicate, potassium silicate, lithium silicate, phosphoric acid, surfactant (Triton-X), potassium hydroxide, borax, alpha-cellulose, polyacrylic acid, TEOS (Tetraethyl orthosilicate), and water according to the content (g) listed in Table 1 below.

[0068] Each manufactured inorganic coating composition was coated onto an aluminum substrate to a thickness of 3 μm, then heat-treated at 100°C for 3 hours to remove moisture and form an oxide coating film, and then left at room temperature to allow sufficient drying time.

[0069] After forming the coating film, the appearance of the oxide coating film was observed visually for one month, and after one month, if the area of ​​whitening occurred in more than 50% of the total area, it was marked as x; if it was more than 30% and less than or equal to 50%, it was marked as △; if it was more than 10% and less than or equal to 30%, it was marked as ○; and if it was less than or equal to 10%, it was marked as ◎.

[0070] (g) A B C D E F Sodium silicate 23 14.27 38 22.56 28 22.67 potassium silicate 29 37 27 27.12 39 35.69 lithium silicate 19 39 23 18.7 25 29 Phosphoric acid 0.3 0.6 0.3 0.2 0.6 0.62 surfactants 0.1 0.1 0.1 0.1 0.1 0.1 potassium hydroxide 0.1 0.2 0.3 0.1 0.2 0.1 borax 0.3 0.1 0.1 0.6 0.1 0.6 α-cellulose 0.3 - - 0.5 0.4 0.1 polyacrylic acid 0.1 0.1 0.1 0.1 0.1 - water 20 20 20 20 20 20 TEOS 0.5 0.5 0.5 0.5 0.5 0.5 Total 92.7 111.87 109.4 90.48 114 109.38 x1(Li2O moles) 0.013 0.026 0.015 0.013 0.017 0.019 x2(moles of Na2O) 0.037 0.023 0.061 0.036 0.045 0.037 x3(K2O forfeiture) 0.026 0.033 0.026 0.024 0.035 0.031 y(number of moles of SiO2) 0.271 0.322 0.350 0.261 0.348 0.325 y / (x1+x2+x3) 3.594 3.909 3.420 3.589 3.596 3.725 (x1+x3) / x2 1.030 2.576 0.669 1.001 1.143 1.384 Characteristic evaluation appearance ◎ ○ △ ◎ ◎ ○

[0071] Referring to Table 1 above, in the case of Examples A, D, and E, in which the molar ratio of (x1+x3) / x2 in the alkali metal silicate composition satisfies the range of 0.7 to 1.3, it was confirmed that the coating appearance characteristics were excellent with minimal whitening even after one month.

[0072] Meanwhile, Figure 1 is a photograph of a sample (Al alloy, 5052) (a) not coated with an inorganic coating composition according to an example of the present invention and a sample (b) coated with Example A after being heated to a temperature above the melting point. It was confirmed that when the sample not coated with the inorganic coating composition was heated to a temperature above the melting point, the aluminum melted and flowed down, whereas the aluminum sample coated with Example A to a thickness of 3 μm formed an oxide film without flowing down, effectively preventing fire spread and heat spread.

[0073] FIG. 2 is a photograph of a paper pulp material (a) impregnated with Example A according to an example of the present invention, an impregnated paper pulp material (b) exposed to high temperature, and a paper pulp material (c) completely combusted after exposure to high temperature. Generally, when fire is applied to a paper pulp material, it burns instantly and disappears without a trace, whereas the paper pulp material impregnated with the solution maintains its shape and a solid component of the inorganic coating composition remains after complete combustion. This remaining solid component is in the form of an oxide that can withstand temperatures above 1000°C.

[0074] Figure 3 shows actual photographs of (a) the heated section (front section), (b) the middle section, and (c) the rear section, respectively, after heating an aluminum / paper pulp material / aluminum laminate with the impregnated paper pulp material inserted in the middle. When the impregnated paper pulp material is applied between two aluminum plates, as shown in Figure 3, it was confirmed that the flame could not penetrate the front aluminum, and also that the rear aluminum was effectively blocked from heat and flame, so no deformation occurred.

[0075] At this time, heating was carried out using a standard torch at a distance of about 5 to 10 cm, and it was confirmed that the aluminum on the front surface reached above its melting point in about 10 seconds, and that heat spread throughout the entire aluminum on the front surface, in addition to the heated part, and became molten.

[0076] Although the present invention has been described above through specific details and limited embodiments, this is provided merely to aid in a more comprehensive understanding of the invention, and the invention is not limited to the above embodiments. Those skilled in the art can make various modifications and variations from this description.

[0077] Accordingly, the scope of the present invention is not limited to the described embodiments, and all things equivalent to or having equivalent variations to the claims set forth below, as well as the claims set forth below, shall be considered to fall within the scope of the concept of the present invention.

Claims

Claim 1 The composition comprises an alkali metal silicate, an alkali metal hydroxide, an inorganic acid, a boron-containing compound, an organosilane compound, a thickener, and water, wherein the alkali metal silicate satisfies the following chemical formula 1, and the organosilane compound is one or more selected from tetramethoxysilane, tetraethoxysilane, tetrabutoxysilane, tetrapropoxysilane, tetraisopropoxysilane, tetraisobutoxysilane, trimethoxymethylsilane, triethoxyethylsilane, tripropoxypropylsilane, dimethoxydimethylsilane, dimethoxydiethylsilane, diethoxydimethylsilane, diethoxydiethylsilane, and dipropoxydipropylsilane, and comprises 70 to 85 weight% of the alkali metal silicate, 0.05 to 0.5 weight% of the alkali metal hydroxide, 0.1 to 1 weight% of the inorganic acid, and 0.05 to A fire spread prevention inorganic coating composition characterized by comprising 3 wt%, 0.1 to 1 wt% of the organosilane compound, 0.1 to 1 wt% of the thickener, and 12 to 25 wt% of the water. [Chemical Formula 1] (x1Li2O+x2Na2O+x3K2O)·ySiO2·nH2O (in the above Chemical Formula 1, x1 is the number of moles of Li2O, x2 is the number of moles of Na2O, x3 is the number of moles of K2O, y is the number of moles of SiO2, and n is a natural number from 1 to 20, wherein the molar ratio of (x1+x3) / x2 is a real number from 0.7 to 1.3 and the molar ratio of y / (x1+x2+x3) satisfies 3.5 to 3.8.) Claim 2 delete Claim 3 A fire-spreading inorganic coating composition according to claim 1, wherein the alkali metal hydroxide is one or more selected from the group consisting of lithium hydroxide, sodium hydroxide, and potassium hydroxide. Claim 4 A fire spread prevention inorganic coating composition according to claim 1, wherein the inorganic acid is phosphoric acid, hydrochloric acid, nitric acid, or carbonate. Claim 5 A fire spread prevention inorganic coating composition according to claim 1, wherein the boron-containing compound is one or more selected from the group consisting of borax, sodium borate, sodium metaborate, boric acid, and boron oxide. Claim 6 delete Claim 7 A fire spread prevention inorganic coating composition according to claim 1, wherein the thickener is one or more selected from the group consisting of inorganic thickeners, cellulose-based compounds, protein-based compounds, alginic acid-based compounds, polyvinyl-based compounds, polyacrylic acid-based compounds, and polyether-based compounds. Claim 8 delete Claim 9 a) a step of coating or impregnating a substrate with a fire spread prevention inorganic coating composition selected from any one of claims 1, 3 to 5 and 7; and b) a step of heat treatment; comprising a method for manufacturing a fire spread prevention coating film.

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