KR100992888B1 - Environmental fire resistant spray coating composition - Google Patents

Abstract

PURPOSE: An environment-friendly fireproofing material composition for spraying is provided to secure the excellent strength expression and the proper density formation by including uniform level of internal pores. CONSTITUTION: An environment-friendly fireproofing material composition for spraying contains the following: 100 parts of binder by weight including waste concrete micro powder, and alpha-hemihydrate gypsum formed with flue gas desulfurization gypsum or phosphor gypsum; 20~30 parts of surface modifier by weight selected from the group consisting of beta type hemihydrate, anhydrous gypsum, slag, quicklime, calcium hydroxide, and fly ash; 10~40 parts of filler by weight; 20~40 parts of fireproof material by weight; and 1~10 parts of foaming agent by weight.

Description

Environment-friendly fire-resistant coating composition {Environmental fire resistant spray coating composition}

The present invention relates to an environmentally friendly fireproof coating composition, and more particularly, to a fireproof coating material and a composition thereof, including alpha-type hemihydrate gypsum and waste concrete fine powder.

As a means for many people to live in densely populated and small areas, high-rise and large-scale buildings are being used.In most cases, steel structures are applied in order to maintain safe load and robustness of high-rise and large buildings. It is becoming.

However, large-scale high-rise buildings have a high risk of human injury from toxic gases when a fire breaks out, and the strength and strength of the steel structure are reduced by high heat, and there is a risk of collapse of the building without enduring its own load. Therefore, in order to improve this, a method of forming a fire resistant coating layer on the outside of steel structures has been applied.

Asbestos and rock wool were mainly used as the main materials for fireproof insulation, but asbestos is known to be a carcinogenic substance and its use is almost stopped all over the world. Construction environment is bad and causes the problem of polluting the surrounding environment.

The rock wool fireproof coating has the advantages of low specific gravity and excellent fire resistance, but requires skill in the construction of a suitable density that can satisfy the fire resistance and strength, and has the appropriate homeostasis of the slurry (turbidity) It has a difficult point, and also has problems such as dropping of the coating material and scattering of rock wool, which is an inorganic fiber, over time after construction.

In order to solve this problem, various expanded natural minerals, such as vermiculite and perlite, have been developed in the preparation of the slurry (cloud), but the expanded natural minerals have numerous pores on the surface thereof. As a result, the control of the open pores according to the change of viscosity during spraying using the slurry form mixed with water is a big problem to be solved.

Accordingly, the inventors have found an inorganic coating material for fire-resistant coatings capable of appropriate density formation and construction quality control by securing environmentally friendly and constant levels of durable voids, and completed the present invention.

It is an object of the present invention to provide an environmentally friendly and durable level of durable voids to provide an inorganic-based fireproof coating composition having excellent density formation and excellent strength expression within a short time.

It is an object of the present invention to provide a fireproof coating material for spraying having excellent compressive strength, lightness and fire resistance satisfying the non-shrinkability of the composition.

In order to achieve the above object, the present invention provides an environmentally friendly fireproof coating composition capable of forming an appropriate density and controlling the construction quality by ensuring a durable level of durable voids.

The present invention provides a fireproof coating material for spraying having excellent compressive strength, light weight, and fire resistance satisfying the non-shrinkability produced by the composition.

Hereinafter, the present invention will be described in detail.

The present invention

Beta flue desulphurized gypsum or phosphate dihydrate gypsum at a temperature of 100 to 150 ° C. with respect to 100 parts by weight of a binder having a water content of 1% or less, including alpha-type hemihydrate gypsum and waste concrete fine powder, which are produced by pressurized steam or pressurized hydrothermal synthesis. 20 to 30 parts by weight of at least one surface modifier selected from type hemihydrate gypsum, anhydrous gypsum, slag, quicklime, slaked lime, fly ash and cement; 10 to 40 parts by weight of the filler; Refractory material 20 to 40 parts by weight; And a foaming agent of 1.0 to 10 parts by weight; provides an inorganic fire-resistant coating composition consisting of.

The inorganic spray fireproof coating composition of the present invention comprises a mixture of alpha-type hemihydrate gypsum and fine concrete powder in a binder in a weight ratio of 70 to 80:20 to 30, wherein the mixture comprises 20 to 60% by weight. It is done.

Flue gas desulfurized gypsum or phosphate dihydrate gypsum in the binder has a particle size of less than 150㎛ discharged from the dry process of alpha-type hemihydrate gypsum and circulating aggregate produced by pressurized steam or pressurized hydrothermal synthesis at a temperature of 100 to 150 ℃ It is characterized by comprising a fine powder of concrete.

In the present invention, the alpha-type hemihydrate gypsum can be produced by processing gypsum, chemical gypsum and natural gypsum generated as an industrial by-product, natural hemihydrate gypsum can be used as it is. The alpha-type hemihydrate gypsum has an important purpose in the initial strength expression and stable long-term strength of the inorganic spraying fireproof coating according to the present invention as the purpose and strength control agent of caking.

If gypsum, which refers to ordinary gypsum gypsum or anhydrous gypsum, is not hydrated on its own, it does not have characteristics such as strength expression. However, the alpha-type hemihydrate gypsum of the present invention is condensed to the hydration reaction of the alpha-type hemihydrate gypsum ( As a control of the housekeeping time, it has a characteristic of expressing high strength within a short time by reacting with water within a short time to form a crystal after hydration as in the following reaction formula.

For this reason, alpha-type hemihydrate gypsum may contain a small amount of Ⅱ-anhydrite, Ⅲ-anhydrite and / or beta-type hemihydrate, but even a small amount of hydrated gypsum, such as abnormal quenching, increase of mixed quantity and decrease in strength, etc. Since it adversely affects the physical properties it is preferable to remove.

In addition, the inorganic type fire-resistant coating material contains the alpha-type hemihydrate gypsum, unlike the existing cement composition, the alkalinity is not high, so there is little concern about neutralization, and the wet and dry repetitive action and freeze-thawing action by securing a certain level of durable voids It is possible to secure stable durability and excellent workability in the cross-section having an irregular shape through the initial fluidity secured.

More specifically, the alpha-type hemihydrate gypsum from dihydrate gypsum may be prepared by an atmospheric pressure solution method, a pressurized hydrothermal method, a microwave method, and a hybrid hydrothermal reaction method. The atmospheric pressure solution method is prepared by heating the dihydrate gypsum with an catalyst under an aqueous solution at 100 ° C. and atmospheric pressure conditions. The pressurized hydrothermal method is prepared using an autoclave reactor at a temperature of 100 to 150 ° C., and the microwave method. A molded article of silver hydrated gypsum is produced by irradiating microwaves so as to have a temperature of 120 to 140 ° C in a micro oven. In addition, the hybrid hydrothermal reaction method is a manufacturing method that can simultaneously perform the pressurized hydrothermal method and the microwave method to shorten the long reaction time of the pressurized hydrothermal method and to reduce the external diffusion speed of the molded body that can occur when using only microwave There are advantages to it.

In the present invention, the waste concrete powder is an industrial by-product that is incidentally generated through crushing and grinding to recycle waste concrete when manufacturing recycled aggregates in construction waste, and the waste concrete fine powder of the present invention is used in the dry process of recycled aggregates. One containing main components such as 45% of silicon oxide (SiO ₂ ), 30% of calcium oxide (CaO), and 10% of aluminum oxide (Al ₂ O ₃ ) having a particle size of 150 μm or less to be discharged is used.

The present invention comprises a mixture comprising an alpha-type hemihydrate gypsum and waste concrete fine powder in a weight ratio of 70 to 80:20 to 30, characterized by using a binder containing 20 to 60% by weight of the mixture.

The mixture of alpha-type hemihydrate gypsum and waste concrete fine powder should be formed in a weight ratio of 70 to 80:20 to 30, which prevents the occurrence of microcracks and deterioration of long-term durability due to the deterioration of the physical properties of the inorganic coating fireproof coating. It has an important meaning.

In addition, when the mixture is contained in the binder less than 20% by weight, it is difficult to express the strength of the fireproof coating for spraying, causing a delay in condensation, and when it exceeds 60% by weight, it is difficult to secure appropriate construction properties of the fireproof coating for spraying. .

In the present invention, the binder of the inorganic spraying fireproof coating has a water content of 1.0 wt% or less, and if the moisture content of the binder exceeds 1.0 wt%, the hydration of the alpha-type hemihydrate gypsum in the inorganic spraying fireproof coating composition itself is As a result, the strength decreases through conversion to gypsum plaster, and the dispersion of the added plaster hardening retardant is not uniform, so that the overall physical properties of the inorganic spray fireproof coating material become uneven, so that the water content of the binder is dried to 1.0 wt% or less. It is preferable to use.

The inorganic spray fireproof coating composition of the present invention comprises 20 to 30 parts by weight of at least one surface modifier selected from beta-type hemihydrate gypsum, anhydrous gypsum, slag, quicklime, slaked lime, fly ash and cement with respect to 100 parts by weight of the binder; 10 to 40 parts by weight of the filler; Refractory material 20 to 40 parts by weight; And 1.0 to 10 parts by weight of the foaming agent.

Inorganic spraying fireproof coating composition of the present invention may further comprise a fluidizing agent, a gypsum hardening retardant and mixtures thereof in addition to the above components, the fluidizing agent is 5.0 parts by weight or less based on 100 parts by weight of the binder and half the alpha-type It is preferable to add the plaster hardening retardant to 3.0 parts by weight or less based on 100 parts by weight of gypsum.

More specifically, the fluidizing agent may be used at least one selected from lignin sulfonate, polynaphthalene sulfonate, polymelamine sulfonate and polycarboxylate-based water reducing agent.

The fluidizing agent is used to secure the required workability by increasing the fluidity of the inorganic spray coating composition for spraying, it is preferable to use 0.01 to 5.0 parts by weight based on 100 parts by weight of the binder. If it is used in excess of 5.0 parts by weight, there is a problem that may adversely affect the generation of bubbles due to excessive dispersibility improvement to reduce the weight.

In addition, the gypsum hardening retardant is an inorganic or organic salt such as gluconic acid, citric acid, tartaric acid, glucoheptonic acid, arabic acid, malic acid or citric acid and their sodium, potassium, calcium, magnesium, ammonium, triethanolamine, etc. Oxycarboxylic acid; Monosaccharides such as glucose, fructose, galactose, saccharose, xylose, abitose, lipoose, isosaccharides, oligosaccharides such as disaccharides and trisaccharides, oligosaccharides such as dextrins, or polysaccharides such as dextran, and these Sugars such as molasses to contain; Sugar alcohols such as sorbitol; Magnesium silicate; Phosphoric acid and its salts or boric acid esters; Aminocarboxylic acids and salts thereof; Alkali soluble protein; Fumic acid; Tannic acid; phenol; Polyhydric alcohols such as glycerin; Aminotri (methylenephosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, ethylenediaminetetra (methylenephosphonic acid), diethylenetriaminepenta (methylenephosphonic acid) and alkali metal salts thereof, alkali Phosphonic acids and derivatives thereof such as earth metal salts; Etc. may be used. The gypsum hardening retarder delays a very fast hardening time of the alpha-type hemihydrate gypsum to ensure sufficient working time, and it is preferable to use 0.01 to 3.0 parts by weight with respect to 100 parts by weight of the alpha-type hemihydrate gypsum. If it exceeds 3.0 parts by weight, the hardening time of the alpha-type hemihydrate gypsum is very delayed, causing problems in strength development.

In the present invention, the filler is used in 10 to 40 parts by weight with respect to 100 parts by weight of the binder, it is any one or more selected from limestone, fine aggregate (silica sand), circulating fine aggregate, pulp and lightweight aggregates, It has the characteristics of improving strength and improving durability, and there is no limitation on the size (particle size).

The limestone is excellent in the filling effect to increase the durability and strength by densifying the tissue. In addition, the circulating aggregate aggregate uses the aggregate suitable for the quality standards of circulating aggregates, circulating aggregate aggregates can be lighter because the density is smaller than natural aggregates, the compressive strength is increased when some replacement, and there is an advantage to improve the durability.

If the filler is used in less than 10 parts by weight, the effect of suppressing shrinkage of the cured body may be insignificant, and the dry shrinkage may be increased. When the filler is used in excess of 40 parts by weight, the filler is excessively deteriorated in fluidity and workability. It is uneconomical.

In the present invention, the refractory material is used in 20 to 40 parts by weight of the refractory material with respect to 100 parts by weight of the binder, at least one selected from perlite, vermiculite, sepiolite and hollow ceramics, the weight of the molded product and heat insulation and insulation However, it is preferable to have the characteristic as a fireproof material.

Sepiolite (sepiolite) is for improving the strength, light weight, and bubble retention, has the characteristics that capacity shrinkage does not occur due to the expansion and drying of the bubble generated by the foaming agent is cured with a bubble inside It acts as an adsorption holding carrier to allow fine bubbles on the order of 100 to 500 μm to be uniformly dispersed without disappearing in the refractory coating. In addition, the hollow ceramic is excellent in thermal insulation and heat shielding effect and waterproof effect, can be used to replace a part for the prevention of burns, and excellent heat and cold effect to solve the condensation of the wall, to reduce the volatile harmful substances have.

In the present invention, the foaming agent uses 1.0 to 10 parts by weight of the foaming agent with respect to 100 parts by weight of the binder, proteolytic products; Saponin; Casein or casein sodium-based compounds; An amine compound selected from monoethanolamine, monoethanolamine, triethnolamine, and lauryl dimethyl amine oxide; Cocoamide; Cocoamino acid salts; Polyethylene glycol; Surfactant; It can use 1 or more types chosen from.

The foam liquid is to improve the light weight and thermal insulation, it can be used in the form of liquid or powder as the animal or vegetable foaming agent, prepared by mixing the foaming agent so that the concentration of water to 1 to 10% by weight and foamed with a foaming machine Use bubble liquid.

The powdery foaming agent may use silicon carbide having an average particle diameter of 5 μm or less, or a foaming agent such as sodium hydrogen carbonate, aluminum powder, zinc powder, iron powder, or air entraining agent. The same animal protein foaming agent is used.

The animal protein foaming agent uses a known animal protein foaming agent based on horns, claws, etc., which are by-products such as cattle and pigs.

In the present invention, if the foaming agent is used less than 1.0 parts by weight, the amount of bubbles generated is very small to achieve the effect of light weight, heat insulation and insulation, and when used in excess of 10 parts by weight excess foam is formed and compressed There is a problem that causes a decrease in strength.

The present invention provides an inorganic coating fireproof coating comprising a composition consisting of the above configuration and content.

The inorganic spray coating material comprising the composition consisting of the above composition and content is environmentally friendly by recycling industrial by-products, it is possible to form a suitable density by securing a certain level of durable voids, has the advantage of having light weight and heat resistance and heat insulation. . In addition, the use of alpha-type hemihydrate gypsum and waste concrete fine powder as the main raw material has an excellent strength expression within a short time, thereby reducing the construction cost of early construction.

The fireproof coating material for inorganic spraying of the present invention is environmentally friendly by recycling industrial by-products, and has an advantage of reducing cracking due to proper density formation and shrinkage due to securing a certain level of durable voids.

In addition, the use of alpha-type semi-hydrated gypsum and waste concrete fine powder as the main raw materials as compared with the existing refractory spraying agents and fire-resistant coating materials composed of the main raw materials of cement and hardened aggregates provides excellent strength within a short period of time, thereby reducing the construction cost due to early construction. In addition, there is an advantage that has excellent compressive strength, light weight and fire resistance to meet the fire resistance standards.

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the present invention is not limited by the following examples, and various modifications or changes can be made within the spirit and scope of the present invention to those skilled in the art.

Hereinafter, the technical and scientific terms used herein will be understood by those skilled in the art without departing from the scope of the present invention. Descriptions of known functions and configurations that may be unnecessarily blurred are omitted.

[ Production Example  One]

A binder having a water content of 1% or less, including 50% by weight of a mixture of 80% by weight of alpha-type hemihydrate gypsum (α100 of Yusung Tech Co., Ltd.) and 20% by weight of waste concrete fine powder, was prepared by a conventional method.

[ Production Example  2]

A binder having a water content of 1% or less, including 50% by weight of cement (usually one Portland cement) was prepared by a conventional method.

[ Example  One]

20 parts by weight of slag (3 types), 25 parts by weight of silica sand (General No. 7), 20 parts by weight of ferrite (aesthetic industry), 1 part of powder foaming agent (Winflow, AE100) based on 100 parts by weight of the binder of Preparation Example 1 After the mixing, 1 part by weight of a fluidizing agent (Degussa, Melment F-10) and 0.2 part by weight of a gypsum hardening retardant (sodium citrate) were added to prepare a composition of an inorganic type fireproof coating material, and the above fireproof coating material. 20% by weight of water was administered to the composition to prepare a fireproof coating material.

[ Example  2]

20 parts by weight of slag (3 types), 25 parts by weight of silica sand (General No. 7), 20 parts by weight of ferrite (aesthetic industry), 1 part of powder foaming agent (Winflow, AE100) based on 100 parts by weight of the binder of Preparation Example 1 After admixing, 1 part by weight of a fluidizing agent (Degussa, Melment F-10) was added to prepare an inorganic spraying fireproof composition, and 20 wt% of water was sprayed to the spraying fireproof coating composition to spray the fireproofing material. The coating material was prepared.

[ Example  3]

20 parts by weight of slag (3 types), 25 parts by weight of silica sand (General No. 7), 10 parts by weight of ferrite (aesthetic industry), 10 parts by weight of hollow ceramics, powder foaming agent (win) based on 100 parts by weight of the binder of Preparation Example 1 After mixing 1 part by weight of Flow, AE100), 1 part by weight of a fluidizing agent (Degussa, Melment F-10) and 0.2 part by weight of gypsum hardening retardant (sodium citrate) were added to prepare a composition of an inorganic coating fireproof coating material. The fireproof coating material for spraying was prepared by administering 20 wt% of water to the spraying fireproof coating composition.

[ Comparative example  One]

To 100 parts by weight of the binder of Preparation Example 2, 20 parts by weight of slag (3 types), 25 parts by weight of silica sand (General No. 7), 20 parts by weight of perlite (fine industry) were mixed, followed by a fluidizing agent (Degussa, Melment F). -10) 1 part by weight, 0.5 part by weight of powder foaming agent (Winflow, AE100) was added to prepare a fireproof coating composition for spraying, and 20% by weight of water was added to the spraying fireproof coating composition for spraying a fireproof coating material. Prepared.

[ Comparative example  2]

Gypsum after mixing 20 parts by weight of slag (3 types), 25 parts by weight of silica sand (General No. 7), 10 parts by weight of perlite (aesthetic industry), 10 parts by weight of hollow ceramics, based on 100 parts by weight of the binder of Preparation Example 2 0.2 parts by weight of a curing retardant (sodium citrate) and 1 part by weight of a powder foaming agent (Winflow, AE100) were added to prepare a fireproof coating composition for spraying, and by spraying 20% by weight of water to the spraying fireproof coating composition. A fireproof coating material for lacquer was prepared.

[ Test Example ]

The physical properties of the structures according to the Examples and Comparative Examples were measured. Physical properties were measured as follows.

Condensation time: KS L 5108 (Test method for condensation time of hydraulic cement by Vicat needle)

Compressive strength: KS L 5105 (Test method for compressive strength of hydraulic cement mortar)

Fire resistance performance: KS F 2257 (Test method for fire resistance of building members)

Thermal Conductivity: KS L 9016 (Testing method of thermal conductivity of insulation)

As can be seen from the results of Table 1, in the case of the refractory coating material for spraying containing a water content of 1% or less, including alpha-type hemihydrate gypsum and waste concrete fine powder of Examples 1 to 3 of the present invention, the curing time is considerably It can be confirmed that not only shorten the time required for the work, but also the strength was better than the fireproof coating for spraying of the comparative example.

In the case of the refractory coating material for spraying of Comparative Examples 1 to 2 showed strong alkalinity as a result of pH measurement, it was confirmed that the refractory coating material for spraying of Examples 1 to 3 of the present invention showed neutrality. This is also a result of confirming that the fireproof coating composition for spraying of the present invention is an environmentally friendly material.

From the above results, it was confirmed that the fireproof coating material prepared in the composition and content of the present invention satisfies the fire resistance performance standard and has excellent compressive strength, fire resistance, heat resistance, heat insulation, and shrinkage resistance.

Claims (8)

Flue gas desulfurized gypsum or phosphate gypsum has a particle size of 150 ㎛ or less discharged from the dry process of hydrated gypsum and recycled aggregates. A mixture of finely divided waste concrete containing 45% of silicon oxide (SiO ₂ ), 30% of calcium oxide (CaO), and 10% of aluminum oxide (Al ₂ O ₃ ) in a weight ratio of 70 to 80:20 to 30 1 type selected from beta-type hemihydrate gypsum, anhydrous gypsum, slag, quicklime, hydrated lime, fly ash and cement, based on 100 parts by weight of a binder having a water content of 1% or less containing 20 to 60% by weight of the mixture. 20 to 30 parts by weight or more of the surface modifier; 10 to 40 parts by weight of the filler; Refractory material 20 to 40 parts by weight; 1.0 to 10 parts by weight of the foaming agent; And a fluidizing agent, a gypsum curing retardant, and a mixture thereof, wherein the fluidizing agent is 0.01 to 5.0 parts by weight based on 100 parts by weight of the binder, and 0.01 to 3.0 parts by weight based on 100 parts by weight of alpha-type hemihydrate gypsum. Fire-resistant coating composition for inorganic spray consisting of. delete delete delete The method of claim 1,
The filler is fireproof coating composition for inorganic spraying is any one or more selected from limestone, fine aggregate (silica sand), circulating fine aggregate, pulp and lightweight aggregate. The method of claim 1,
The refractory material is at least one inorganic fuming refractory coating composition selected from perlite, vermiculite, sepiolite and hollow ceramics. The method of claim 1,
The foaming agent is a protein degradation product; Saponin; Casein or casein sodium-based compounds; An amine compound selected from monoethanolamine, monoethanolamine, triethnolamine, and lauryl dimethyl amine oxide; Cocoamide; Cocoamino acid salts; Polyethylene glycol; At least one inorganic spraying fireproof coating composition selected from the group consisting of: surfactant. Claims 1, 5 to 7, including the composition of any one of the selected inorganic spraying fireproof coating material.