KR20000037956A - Nonflammable insulative coating composition and preparation method thereof - Google Patents

Abstract

PURPOSE: Nonflammable insulative coating compositions and their preparation method are provided, which compositions are light-weighted and do not generate dust. CONSTITUTION: A composition comprises 12-25 wt.% of perite whose size is in the range of 0.08 to 3.0 mm; 25-45 wt.% of cement; 1.1-2.7 wt.% of an accelerating agent for cement; 5-10 wt.% of a heat absorbing material; 25-45 wt.% of a water-soluble synthetic resin-type binder; 0.5-1.2 wt.% of a pore forming agent and coconut diethanol amide being a pore stabilizer; and 2.0-3.0 wt.% of sodium carboxymethyl cellulose. Preferably the accelerating agent for cement is aluminate and silicate, the heat absorbing material is selected from calcium hydroxide, aluminium hydroxide and sodium hydrogen carbonate, the water-soluble synthetic resin-type binder is selected from latex, chlorinated paraffin, vinyl acetate copolymer and vinyl chloride copolymer, and the pore forming agent is polyoxyethylene oxide or alcohol ethoxy sulfate.

Description

Fireproof insulation coating composition and its manufacturing method

The present invention relates to a fire-resistant insulating coating composition and a method for manufacturing the same, and more specifically, to prevent the strength of the steel structure is reduced by the flame and high heat during the fire is coated on the surface of the building and various structures made of steel structure The present invention relates to a fire-resistant insulating coating composition mainly composed of perlite and vermiculite and a method of manufacturing the same.

In order to maximize the utilization of narrow land as the population living in rural areas moves to a large, productive and productive city, high-rise and large-scale construction of residential and commercial buildings and various structures is rapidly progressing. As a means to achieve the steel structure has a number of advantages over the existing concrete structure is occupying most of the situation. In this large-scale high-rise building and structure, not only human injury is caused by toxic gases and smoke generated when various interior materials are burned when a fire occurs, and high-temperature heat generated by flame raises the temperature of steel structure, Degradation of the load causes catastrophic events such as the collapse of structures. The latter damage is much more serious than the former and may affect neighboring buildings. To prevent this, the method of coating fireproof coating on steel structures is adopted.

As for the fire-resistant insulation coating used in the past, asbestos and rock wool were used as the main materials, but asbestos is a substance causing carcinogenesis, which is almost stopped in the world. Cement and other additives are used as the main binder in the mineral fiber rock wool system. It has been used by mixing calcium hydroxide, alumina alumina, etc. These rockwool fireproof coatings have the advantages of small specific gravity and excellent fire resistance, but many dusts are generated during construction, which makes the construction environment of the worker bad and pollutes the surrounding environment. do. In addition, since the initial density is 80-120kg / m ³ during construction, it is cumbersome to perform compaction work to improve the strength and construct it with a density of 350kg / m ³ to satisfy the fire resistance performance, and the adhesion strength to the steel structure is 500kg / It is less than ² m and its strength and surface hardness are low, so the peeling of coating materials and the scattering of rock wool, inorganic fibers, occur over time, which may cause problems of respiratory and skin diseases to residents in the structure and those who work around. Doing.

Korean Patent Publication No. 74-426 is based on perlite and asbestos, a calcined product of obsidian or pearlite, and is mixed with arc powder, white cement, urea resin, PVC emylzone, and other additives such as magnesia, magnesium sulfate, and magnesium chloride. Insulation fire-resistant mortar has been disclosed, which has the advantages of good surface hardness, compressive strength and adhesion at the interface, but promotes corrosion of metal when coating steel structure, which is steel, and is a common phenomenon of coating material using cement. Due to the low shear strength and lack of condensation, only one coating thickness of about 10 mm can be formed by one spraying. Therefore, in order to achieve sufficient fire resistance, the insulation surface must be sprayed several times after the previous coating surface has been dried. Has the disadvantage of increasing.

U.S. Patent No. 5,085,897 uses Al (OH) 3 and wollastonite which can expand and combine with silicate in case of fire while using ferrite and vermiculite as aggregate and liquid silicate such as sodium or potassium as a binder. Although fireproof coating compositions for spraying have been disclosed, there is a problem in that workability is poor because cracking occurs on the coating surface, there is a risk of peeling off, and there is no quick fixation, so that sagging of the coating surface occurs during operation, and thus, spraying is required several times.

U.S. Patent Nos. 3, 839, 059 and European Patent No. 0341981 A2 disclose fire-resistant coating compositions containing hydrated gypsum-based binders, fibrous materials such as glass or cellulose, clay aggregates and surfactants, with about 60% gypsum. It contains powder, which is excellent in curability and prevents sagging of coated surface, but has a problem of low surface hardness and insufficient strength.

Japanese Patent Laid-Open No. Hei 6-32666 uses fire-resistant cement and sodium silicate as a binder, and uses refractory materials such as ferrite and unbaked vermiculite as a main aggregate, and mixes sodium hydrogen carbonate, aluminum hydroxide and vinyl acetate synthetic resin powder as additives. The coating composition is disclosed and contains fire-free vermiculite and expanded composition, which has good fire resistance due to the endothermic reaction, but cement and sodium silicate have mutually cohesive properties, but they do not improve hardness and strength. Since the added synthetic resin is powder and the amount of addition is small, the impact strength of the coating material is easily damaged since the low impact strength cannot be improved.

The present invention has been made in consideration of the above problems, and its purpose is to contain a lot of pores, such as light weight fire-resistant coating material, lightweight, has a quickness without causing pollution, such as dust, sagging of the coating Fireproof coating insulation composition mainly made of perlite or vermiculite, which is an inorganic non-combustible material that has excellent surface hardness and strength as well as initial surface hardness and strength over a long period of time, while forming a sufficient fireproof coating thickness in one construction and its manufacturing method To provide.

The present invention is 12 to 25% by weight of the perlite powder having a particle size of 0.08 to 3.0mm; 25 to 45 wt% cement powder; 1.1 to 2.7 wt% of cement quickener; 5 to 10% by weight of heat absorbing material; After homogeneously mixing 2.0 to 3.0% by weight of the carboxymethyl cellulose soda powder, 25 to 45% by weight of the water-soluble synthetic resin binder and the pore stabilizer coconat diethanol amide and the pore former are 0.5 to 1.2% by weight of water. The present invention provides a fire-resistant heat-insulating coating composition and a method for producing the same, which are sprayed at room temperature and mixed with each other homogeneously.

The present invention is a homogeneous mixture of perlite (or vermiculite), cement, cement fasteners, thickeners and endothermic powders, and a water-soluble synthetic resin binder, a pore agent and a pore stabilizer is mixed with water, and then the mixed powder and mixed liquid phase Are mixed with each other to produce a fireproof insulation coating composition.

Perlite (Lightite) is a porous powder whose volume is expanded by rapid vaporization of moisture contained mainly by grinding and rapid heating (900-1200 ° C.) gemstones such as pearl rock, and SiO ₂ 70.0-76.0 wt%, Al ₂ O ₃ 12.0 ~ 16.0%, Fe ₂ O ₃ and small amount of other components such as K ₂ O, and refers to a powder with a coarse particle size of about 80mm or less, coarse than 80㎛ after expansion, and the thermal conductivity is 0.03 to 0.04 As it is excellent at Kcal / mh ℃, it is widely used as light-weight material and heat-insulating material in construction and high-temperature piping, and also has non-flammable inorganic material, which is harmless to human body at high temperature.

Vermiculite is a secondary mineral in which biotite and gold mica are deformed, and also expands to a material containing pores, such as perlite, while expanding at rapid heating (500 to 800 ° C). The thermal conductivity and density (0.02 to 0.4 g / cm 3) are similar to those of perlite and are used for similar purposes.

The cement, which serves as a binder, mainly refers to general portland cement for construction, but may include back cement and fast cement, and improves the strength and surface hardness of the coating material as a hydraulic binder for perlite and vermiculite.

It is added to quickly solidify the cement fastener cement, SSP and SSL-A (white powder based on aluminate and silicate and semi-transparent liquid, manufactured by Segan) or Signite K and D (Sigunit K , D, aluminate and carbonate based on white powder, manufactured by Sica Korea Co., Ltd.) can be used to give the initial strength to the cement binder to prevent sagging of the composition.

The heat absorbing material serves to reduce the temperature rise of the structure by absorbing heat due to the fire and generating heat or carbon dioxide gas when a fire occurs after the fireproof coating composition is coated on the steel structure, calcium hydroxide [Ca ( OH) ₂ ], sodium hydrogen carbonate [NaHCO ₃ ] and aluminum hydroxide [Al (OH) ₃ ] can be used to select one or more of these and look at the reaction formula for calcium hydroxide as follows.

Ca (OH) ₂ → CaO + H ₂ O-15,600 cal / mol

The water-soluble synthetic resin binder is for increasing the shear strength and the tensile strength of the fire-resistant coating composition, latex (Latex), chlorinated paraffin (Chlorinated paraffin), vinyl acetate (PVAc) or vinyl chloride (PVC) copolymer (Ethylene) One or more kinds of copolymers can be selected and used, and the amount of addition may vary depending on the solid content and viscosity.

The pore agent and the pore stabilizer are intended to improve the fire resistance heat insulation, to lower the density of the composition to prevent sagging, and to increase the strength by forming more pores in the fireproof coating composition, and as a pore agent, polyoxyethylene oxide ( Polyoxyethylene oxide, sodium dodecyl sulfate or alcohol ethoxy sulfate can be selected from one type, and as pore stabilizer Coconut diethanol amide and The same amount is added, and the amount added is about 1/2 of the foaming agent.

Other additives include carboxymethyl cellulose sodium as a thickener that enhances the viscosity of the aqueous solution to prevent sagging of the fireproof coating composition, and about 2-3 wt% of water is added.

That is, the present invention is a liquid type binder, a water-soluble synthetic resin type binder, and a pore-forming agent and a pore stabilizer are added and mixed with water, and the remaining powder phase is homogeneously mixed, so that the former mixed liquid phase and the latter mixed powder are sufficiently mixed. Cover the surface of the steel structure with adjustment. At this time, the amount of water should be adjusted in consideration of the curing rate of the coating material composition, wettability with the structure and sagging problems. That is, the amount of water to be added is added in the weight range of about 0.8 to 1.2: 1 with respect to the total amount of the entire fire resistant coating composition. In particular, the optimum ratio of water is preferably from 0.9 to 1.1: 1.

Hereinafter, the present invention will be described in detail with reference to Examples. (However, these examples are not intended to limit the scope of the present invention to present a preferred composition of the present invention.)

Example 1

A particle size of 50 mesh 35% and 150 mesh 65% perlite powder 6,000g, Portland cement 9,300g, SSP 700g as a fastener, 1,900g aluminum hydroxide and 750g of carboxymethyl cellulose soda as a thickener. After moving to the main nozzle, an aqueous solution of 16,000 g of vinyl chloride copolymer mixed in 32 liters of water was injected into the powder composition passing through the pipeline through a liquid spray nozzle installed around the pipeline through which the powder composition passes. After homogeneous mixing with each other, the mixture is sprayed through the main nozzle so that the specimen is sufficiently wetted (Wetting).

Three specimen surfaces made of small H-beams (300 x 300 x 10 x 4.5 mmt) were coated with spray nozzles while maintaining a distance of 1-2 m. In order to maintain a constant coating thickness, the coating surface was immediately finished with a trowel, and the coating thicknesses after sufficient hardness were 25.7 mm (Sample 1), 34.2 mm (Sample 2) and 47.8 mm (Sample 3), respectively, and the density was about 520 Kg. / m3.

In order to measure the fire resistance of the specimen, H-shaped steel was charged into a heating furnace and heated (Sample 1: 925 ° C. for 60 minutes, Specimen 2: 1010 ° C. for 120 minutes, Specimen 3: 180 ° C. for 1050 ° C.) while H was heated. The interface temperature between the shaped steel and the cladding was measured. The temperature was measured by attaching a temperature sensor (three locations on the left, right and center) before coating the fireproof coating composition on the H-beam specimen surface and measuring the temperature change over time by this sensor. Table 1 below.

Table 1. Result of temperature measurement of specimen (unit: ℃)

Elapsed time (minutes) 10 20 30 40 50 60 80 100 120 140 160 180 Psalm 1 46 73 98 104 127 218 250 307 339 365 418 445 Psalm 2 48 78 105 107 116 147 179 226 256 281 297 342 Psalm 3 34 51 65 76 99 105 114 138 185 216 245 287

Example 2

6,000 g of perlite powder of 50% and 50% of particle size of 50 mesh, 14,900 g of Portland cement, homogeneously mix 400 g of Sigunit K, 3,000 g of calcium hydroxide and 750 g of carboxymethyl cellulose as a fastener, 35 l of water 9,400 g of vinyl acetate-based copolymer and 300 g of polyoxyethylene oxide were prepared in the same manner as in Example 1, and specimens 4, 5, and 6 (coating thickness: 15 mm, 25 mm, and 35 mm after drying; density: 360 Kg / m3) was produced to carry out a fire resistance test.

Example 3

6,000 g of perlite powder consisting of 50% of particle size of 50 mesh and 50% of 150 mesh, 16,000 g of Portland cement, 480 g of Sigunit D and 1,900 g of sodium bicarbonate as a fastener, 9,500 g of vinyl acetate copolymer, A liquid obtained by kneading 190 g of polyoxyethylene oxide and 110 g of coconut diethanolamide in 33 L of water was prepared. Next, the two mixtures were mixed and coated in the same manner as in Example 1 to prepare specimens 7, 8 and 9 (thickness: 15 mm, 25 mm and 35 mm; density: 370 Kg / m3) and subjected to a fire resistance test.

Example 4

6,000 g of perlite powder consisting of 50% of particle size of 50 mesh and 50% of 150 mesh, 13,000 g of Portland cement, 370 g of Sigunit D and 1,900 g of aluminum oxide as a fastener are mixed and prepared. A homogeneous solution was prepared by adding and mixing 13,000 g of coal, 190 g of alcohol ethoxy sulfate and 100 g of coconut diethanol amide. Next, two mixtures were mixed and coated in the same manner as in Example 1 to prepare specimens 10, 11, and 12 (coating thickness: 15 mm, 25 mm, and 35 mm; density: 360 Kg / m3), followed by a fire resistance test.

The fire resistance test results for the specimens prepared in each example are shown in Table 2 below.

Table 2. Refractory test result table (unit: ℃)

Specimen number elapsed time (minutes) 4 5 6 7 8 9 10 11 12 10 37 42 25 56 32 43 29 28 35 20 58 69 48 86 78 52 92 52 52 30 95 72 86 108 95 76 106 99 91 40 110 105 99 153 111 103 132 108 108 50 120 136 105 249 128 118 241 142 132 60 250 207 162 315 185 156 267 170 158 80 - 228 175 - 253 184 - 226 192 100 - 286 229 - 298 207 - 242 205 120 - 315 242 - 346 242 - 331 228 140 - - 286 - - 287 - - 265 160 - - 321 - - 304 - - 298 180 - - 339 - - 328 - - 315

As such, the present invention can be seen that the excellent fire resistance performance when coating the steel structure using the fire resistant coating composition of the present invention as shown in Table 1 and Table 2. The coating thickness to exhibit the fire resistance performance (below 350 ℃) of the building structure part is 25mm for the rock wool fireproof coating material when heated for 1 hour, whereas the composition of the present invention is sufficient for 15mm, and the rock wool fireproofing based on 2 hours heating. While the coating material is 35 mm, the composition of the present invention is about 25 mm and the rock wool system is 45 mm based on 3 hours of heating, whereas the composition of the present invention is 40 mm is sufficient. In addition, by using the ferrite or vermiculite as the main aggregate, the thermal insulation effect is excellent, there is no dust scattering during construction, the surface hardness and strength are large, there is no peeling phenomenon, and there are many effects such as no pollution causing factor over time.

Claims (10)

In the fire-resistant insulation coating composition which is coated on the surface of the building and various structures made of steel structure to prevent the strength of the steel structure is lowered by the flame and high heat during the fire occurrence; The fire-resistant insulation coating composition is 12 to 25% by weight of the ferrite having a particle size of 0.08 to 3.0mm; 25 to 45 wt% cement; 1.1 to 2.7 wt% of cement quickener; 5 to 10% by weight of heat absorbing material; 25 to 45% by weight of a water-soluble synthetic resin binder; 0.5 to 1.2% by weight of a pore stabilizer, coconut diethanol amide and a pore former; Refractory heat-insulating coating composition, consisting of 2.0 to 3.0% by weight of carboxymethyl cellulose soda. The method of claim 1; The cement is a refractory insulating coating composition, characterized in that the general portland cement, cement, fast cement. The method of claim 1; The cement fastener is a fire-resistant insulating coating composition, characterized in that mainly based on aluminate and silicate. The method of claim 1; The heat absorbing material is a refractory insulating coating composition, characterized in that the addition of at least one selected from calcium hydroxide, aluminum hydroxide and sodium hydrogen carbonate. The method of claim 1; The water-soluble synthetic resin binder is selected from the group consisting of latex, chlorinated paraffin, vinyl acetate-based or vinyl chloride-based copolymer, characterized in that the refractory insulation coating composition. The method of claim 1; The pore-forming agent is a refractory heat-insulating coating composition, characterized in that the addition of one selected from polyoxyethylene oxide, alcohol ethoxy sulfate. The method of claim 1; Coconut diethanol amide as the pore stabilizer is about one half of the pore former is added to the refractory insulating coating composition. In the fire-resistant insulation coating composition which is coated on the surface of the building and various structures made of steel structure to prevent the strength of the steel structure is lowered by the flame and high heat during the fire occurrence; The fireproof insulation coating composition is 12-25% by weight vermiculite having a particle size of 0.08 ~ 3.0mm; 25 to 45 wt% cement; 1.1 to 2.7 wt% of cement quickener; 5 to 10% by weight of heat absorbing material; 25 to 45% by weight of a water-soluble synthetic resin binder; 0.5 to 1.2% by weight of coconat diethanol amide, which is a pore and pore stabilizer; Refractory heat-insulating coating composition, consisting of 2.0 to 3.0% by weight of carboxymethyl cellulose soda. 12 to 25% by weight of the ferrite powder having a particle size of 0.08 to 3.0 mm; 25 to 45 wt% cement powder; 1.1 to 2.7 wt% of cement quickener; 5 to 10% by weight of heat absorbing material; After homogeneously mixing 2.0 to 3.0% by weight of carboxymethyl cellulose soda powder, 25 to 45% by weight of water-soluble synthetic resin binder and 0.5 to 1.2% by weight of pore agent and coconut diethanolamide are added and mixed to the mixed powder. Method for producing a fire-resistant insulation coating composition, characterized in that the aqueous solution was sprayed at room temperature and mixed homogeneously with each other. The method of claim 9; Wherein said water is added at a weight ratio of about 0.8 to 1.2: 1 relative to the total components of the fire resistant insulation coating composition.