KR20150091565A - Organic·inorganic composite for intumescence fireproof coating - Google Patents

Abstract

The present invention relates to an organic and inorganic composite intumescent fireproof coating material composition and, more specifically, to an organic and inorganic composite intumescent fireproof coating material composition, which performs excellent thermal barrier properties and flame interrupting properties by generating a carbonized layer and an intumescent layer during a fire using a solution mixed with: an inorganic particulate material capable of generating the carbonized layer and the intumescent layer during a fire as a material of flame blockage and thermal barrier performances; ammonium polyphosphate as a dehydrating agent; a melamine resin and a water-soluble acryl-based emulsion resin as a foaming agent; and 75 wt% of alcohol and 25 wt% of water as a solvent.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a fire-

More particularly, the present invention relates to a fire-retardant and fire-retardant performance-improving material for an inorganic / inorganic composite, which comprises an inorganic powder capable of forming a carbonized layer and a pore layer upon fire and an inorganic filler such as ammonium polyphosphate, Melamine resin, water-soluble acrylic emulsion resin and a mixture of 75% by weight of alcohol and 25% by weight of water as a solvent to produce a carbonized layer and a pore layer at the time of fire, thereby exhibiting excellent heat resistance and scratch resistance. And more particularly to a composite fugitive fire resistant coating composition.

The fireproofing material protects buildings and the like from fire to provide a time to suppress the fire by blocking or delaying the approach of the high temperature heat or flame to the surface covering material of the building such as the steel or concrete wood, It is a covering material that provides time. A fire-resisting structure is a structure in which a main structural part of a building has a fire-proofing ability to withstand a high temperature for a certain period of time in a fire, and at the same time, can be reused by simple repair after a fire.

On the other hand, the low-carbon steel used for an architectural steel structure has a critical temperature of about 540 DEG C, and the strength is usually reduced to about 60% at a temperature above the critical temperature. Therefore, in order to minimize the damage of the steel structure due to the reduction of the strength of the steel frame and the damage caused by the fire, the steel frame is applied to the steel structure. Also, in case of concrete structures, it is necessary to maintain the original properties of the concrete structure after the fire suppression, and therefore fireproof coating is carried out.

In general, various basic performances are required for the fireproof fire-resistant cover material to exhibit the function of protecting the steel structure or the concrete structure in case of fire. First, in order to have sufficient heat insulation, the foaming should be smooth and the thickness of the foam coating should be higher than a certain level. When the foaming thickness is thin, sufficient heat insulating property can not be exhibited. Second, the density of the foam layer must be sufficiently high for effective insulation. Even if the thickness of the foam layer is thick, if the density of the foam layer is low, penetration of heat from the outside can not be effectively prevented. Third, uniform foaming should occur without cracking due to excessive foaming or shrinkage upon foaming. If cracks are generated in the foamed coating, the heat may flow into the steel or concrete through the cracked portion and the required fire resistance performance can not be exhibited. Most importantly, the steel or concrete of the building must have no change in film quality due to shrinkage expansion over a long period of time after construction.

On the other hand, as a general pseudo fire resistant coating composition, a composition comprising an organic polymer, an ammonium polyphosphate and a polyhydric alcohol is predominant. In this type of refractory covering composition, ammonia gas or halogen gas, which is poisonous gas, is generated as a by-product at the time of foaming when a fire occurs and the foam layer is made of a carbonized layer, so that the foam layer can easily break . That is, since the refractory performance is limited as described above, the products and applications thereof are limited.

In addition to these organic type fireproof coating materials, there are inorganic fireproof coating materials having a silicate as a main binder. This can solve the problems of the organic type fireproof coating material, but the thickness of the coating film is too thick as compared with the organic fireproof coating material, and cracks occur in the coating film during the drying shrinkage after the application, .

As a specific example, Korean Patent Laid-Open Publication No. 1989-0010138 discloses a technique for fouling fire resistant inorganic fire with liquid metal silicate as a main binder. However, such a composition has a very high pore resistance, but limits the heat resistance of the metal silicate used, so that the foamed coating layer melts and flows down below a high temperature of about 600 ° C or higher.

Japanese Unexamined Patent Publication (Kokai) No. 5-86310 discloses a coating composition for a pseudo fire resistant coating material using ammonium polyphosphate as a foaming agent, melamine as a fireproofing agent, and modified epoxy as a binder. This type of coating material is a coating material in which the coating material composition receives heat and forms a carbon layer by chemical reaction at about 400 DEG C to protect the material from heat. This coating material is excellent in pore performance, but has the disadvantage that the foam layer easily breaks due to hot air because it forms a very weak carbonated layer as well as emits a large amount of ammonia gas when the coating film is foamed.

Korean Patent Laid-Open Publication No. 2005-0070809 also discloses a porcelain refractory coating composition containing a molar ratio controlling agent, a reinforcing agent, an extender pigment, an expandable graphite or an encapsulated foaming additive, and an additive in a silicate. Such a refractory coating composition is excellent in heat resistance by controlling the molar ratio of the silicate and using a reinforcing agent and an additive. However, in the above composition, the expandable graphite is used as the foaming aid for blocking the flame. Also, since the carbonized layer formed by the carbon dioxide is weak, the foam layer is easily broken by the hot air and the flame is infiltrated into the broken foam layers again have. In addition, the composition has a problem in that the carbon dioxide produced by pyrolysis is not retained in the foam layer and is released into the atmosphere, thereby deteriorating the capability of blocking flame propagation.

On the other hand, the general foaming / expansion / thermal insulation mechanism of the silicate fireproof covering material is as follows. In other words, the silicate used as the binder has a water content of 40 to 70% by weight. When these functional groups are heated to a temperature of 70 to 130 ° C. or higher, they expand and expand inside the coating film, . However, the density of these cells is lowered by extender pigments and other fillers used together in the production of coating materials, and due to the lack of heat resistance, the coating films expanded and expanded at a temperature higher than 600 ° C are melted. Therefore, in order to maintain excellent heat resistance performance at a high temperature for a long time, a thick coat layer of more than several thousand microns must be formed.

Korean Patent Publication No. 1989-0010138 Japanese Patent Application Laid-Open No. 5-86310 Korean Patent Publication No. 2005-0070809

It is an object of the present invention to provide a method for producing a carbonized layer and a povidic layer by using mesophase graphite powder (referred to as 'MGP') classified in particle size, sericite and dehydrating agent dehydrate agent, melamine as a foaming agent, a water-soluble acrylic emulsion resin as a binder, and a solvent composed of 75 wt% of alcohol and 25 wt% of water are used as a binder, so that the carbonized layer and the pore layer Inorganic composite fugitive fireproofing coating composition capable of effectively blocking the propagation of a continuous flame by interception of heat, which is one of the three major elements of fire, by exhibiting excellent heat resistance and coloring resistance.

In order to achieve the above-mentioned object, the present invention provides a method for producing a mixture of (a) 25-75% by weight of MGP having a particle size of 5 to 54 micrometers and 25-75% by weight of a sericite powder having a particle size of 1 to 54 5 to 40% by weight of the inorganic mixed powder; (b) 10 to 20% by weight of ammonium polyphosphate as a dehydrate agent; (c) 15 to 25% by weight of melamine as a foaming agent; (d) 5 to 10% by weight of a water-soluble acrylic emulsion resin as a binder; And (e) 30 to 40% by weight of a mixture of 75% by weight of an alcohol and 25% by weight of water as a solvent.

The oil-and-inorganic composite fugitive fireproofing coating composition of the present invention comprises a carbonized layer produced by pyrolysis of MGP, a decomposition of melamine which is a foaming agent and a sericite powder which is transformed into a pseudo- A porous pore layer is formed inside the pore layer produced by the method of the present invention. In addition, the composition of the present invention can improve the dry strength and heat resistance of the coating film and the strength of the porous pore layer by forming a crosslinked coating film of a water-soluble acrylic emulsion resin which is a binder and a drate agent. As a result, the organic / inorganic composite fugitive fireproofing coating composition of the present invention is excellent in heat resistance and coloring resistance, and has excellent foaming efficiency and foam density. Therefore, it can be used as a fireproof covering material for reinforcing bars, pillars, Suitable.

1 is a view showing a flame temperature by a general torch lamp,
2 is a diagram showing the results of the heat differential performance test according to the first embodiment.

Hereinafter, the present invention will be described in detail.

According to the present invention,

(a) 5 to 40% by weight of an inorganic mixed powder comprising 25 to 75% by weight of MGP having a particle size of 5 to 54 micrometers and 25 to 75% by weight of a sericite powder having a particle size of 1 to 54 micrometers;

(b) 10 to 20% by weight of ammonium polyphosphate as a dehydrate agent;

(c) 15 to 25% by weight of melamine as a foaming agent;

(d) 5 to 10% by weight of a water-soluble acrylic emulsion resin as a binder; And

(e) 30 to 40% by weight of a mixture of 75% by weight of alcohol and 25% by weight of water as a solvent.

More particularly, the present invention relates to a carbonized layer formed by pyrolysis of MGP, a carbonized layer formed by decomposition of melamine, which is a foaming agent, And the strength of the porous pore layer is improved by the formation of the coating film in the cross link form of the drate agent and the water soluble acrylic which is a binder, An inorganic / organic composite fugitive fireproofing coating composition excellent in thermal and puncture resistance and excellent in foaming efficiency and foam density is provided.

In order to exhibit an excellent fire resistance performance of a fire-proof and fireproof composite material composition, the carbonization layer and porous porosity expansion must be performed well. In the present invention, the carbonization layer formed by thermal decomposition of MGP and the silica The formation of a porous pore layer in the pore layer produced by the decomposition of melamine, which is a blowing agent, and the foaming density inside the pore layer by carbonization are increased, Blocking performance.

The MGP uses general impression graphite or expanded expanding graphite, and preferably has a particle size of 5 to 54 micrometers.

The MGP is a material composed of a carbon source and is generally a refractory material having a characteristic of expanding by a flame. However, the known expandable graphite is carbonized when the temperature rises excessively during a fire, and decomposed into carbon dioxide, which makes it difficult to produce a porous carbonized layer. In the present invention, known intumescent graphite is used but a sericite powder is used to prevent the carbonized layer from disappearing. The sericite is an inorganic powder with high heat resistance. It prevents the decomposition of the expanded graphite into carbon dioxide due to the heat resistance performance of the expandable graphite and the sericite when used, and plays a supporting role in forming the carbonized foam layer.

The MGP and the sericite powder may be used in a mixture of 25 to 75% by weight of MGP having a particle size of 5 to 54 micrometers and 25 to 75% by weight of a sericite powder having a particle size of 1 to 54 micrometer. 75% by weight, and preferably 40 to 60% by weight of MGP and 40 to 60% by weight of sericite powder. The inorganic powder in which the MGP and sericite are mixed preferably contains 5 to 40% by weight, more preferably 20 to 30% by weight based on the total weight of the components (a) to (e). When the amount of the inorganic powder mixed with the MGP and the sericite is less than 5% by weight based on the total weight of the components (a) to (e), it is difficult to form the carbonized layer by complete combustion, If it is included, the film strength is lowered due to the formation of an excessive carbonized layer, which causes problems of peeling and peeling.

Ammonium polyphosphate, which is a dehydrate agent, plays a role of producing a solid coating film by dehydration at a temperature higher than a certain temperature.

Ammonium polyphosphate, which is a dehydrate agent, is preferably contained in an amount of 10 to 20% by weight, more preferably 13 to 17% by weight, based on the total weight of the components (a) to (e) have. When the content of the ammonium polyphosphate as the dehydrate agent is less than 10% by weight based on the total weight of the components (a) to (e), the resulting coating film layer is thinly formed, If it is contained in an amount exceeding 20% by weight, the coating film layer is formed thick and it is difficult to form a porous coating film by foaming.

In addition, the hydrophobic organic-inorganic composite porous fire retardant coating composition of the present invention uses melamine as a foaming agent to further improve the production of porous carbon layer and foam layer more effective in case of fire. Melamine used as a blowing agent is a known melamine resin for refractory materials and is preferably contained in an amount of 15 to 25% by weight, more preferably 18 to 22% by weight based on the total weight of the components (a) to (e) % ≪ / RTI > by weight. If the amount of the melamine used as the foaming agent is less than 15% by weight, the foaming performance is weak, so that the porous carbonized layer is not produced sufficiently, resulting in insufficient heat shielding performance. If more than 25% by weight of the foaming agent is used, There is a disadvantage in that the strength of the coating film on the forbidden layer is lowered and is easily broken.

In the present invention, it is preferable to use a water-soluble acrylic emulsion resin as the binder. By using the binder, it is possible to improve the adhesion strength at the time of applying the fireproof coating composition to a building, and to prevent cracking of the coating film due to evaporation of water after a long time at room temperature after completion of the application.

As the binder, the water-soluble acrylic emulsion resin is characterized by using a generally known acrylic emulsion. The water-soluble acrylic emulsion resin used as the binder is preferably contained in an amount of 5 to 10% by weight, more preferably 6 to 8% by weight based on the total weight of the components (a) to (e). If the amount of the water-soluble acrylic emulsion resin used as the binder is less than 5% by weight, the adhesion performance as a binder is weakened. If the amount is more than 10% by weight, the film strength of the foamed carbonized layer and the pore layer is decreased, There are disadvantages.

In the present invention, a solvent is used to improve the startability of the refractory coating composition. The solvent is a mixture of 75 wt% of alcohol and 25 wt% of water. The total weight of the components (a) to (e) By weight, more preferably from 33 to 38% by weight, based on the total weight of the composition. If the content of the solvent is less than 30% by weight based on the total weight of the components (a) to (e), the viscosity of the refractory coating composition of the present invention may become too low, If the amount is more than 40% by weight, the appearance and workability may deteriorate, and the dispersibility may be deteriorated when the coating material is produced.

The alcohol used in the solvent may be one or two selected from ethyl alcohol, methyl alcohol, propyl alcohol and butyl alcohol, but is not limited thereto.

The thus formed organic / inorganic composite refractory coating composition of the present invention is characterized in that MGP in which an expansive carbonization layer is formed by a flame in the event of fire, a sericite powder having foam stability and porosity at a certain temperature, ammonia polyphosphate , Melamine as a foaming agent, water-soluble acrylic emulsion resin as a binder, solvents for improving workability and workability are mixed at appropriate ratios, and cracking and insufficient heat resistance of the carbonized layer and the pore layer are effectively controlled. And the fire resistance performance is maintained.

Also, the oil-based composite fugitive fireproofing coating material obtained according to the present invention can be used as an excellent covering material for fireproof coating materials for general buildings, factory buildings, columns and beams of dangerous goods storage and treatment facilities.

Hereinafter, examples and experimental examples of the present invention will be illustrated. The following Examples and Experimental Examples are provided only to aid understanding of the present invention, and thus the technical scope of the present invention is not limited thereto.

Example 1

55% by weight of MGP having a particle size of 5 to 54 micrometers and 10% by weight of a sericite powder having a particle size of 1 to 54 micrometers were mixed and the mixture was stirred for 30 minutes at a rotation speed of 200 as shown in FIG. 1, The particle size distribution of the mixed inorganic powders is shown in Fig. 19.8% by weight of the mixed inorganic powder after mixing, 15% by weight of ammonium polyphosphate as a dehydrate agent, 18% by weight of melamine as a foaming agent, 7.2% by weight of a water-soluble acrylic resin as a binder, 75% And 40 wt% of a mixture containing 25 wt% of the mixture was added and mixed at a rotational speed of 400 for 40 minutes to prepare a refractory coating composition of the present invention.

The refractory coating composition prepared according to the above example was subjected to the fire resistance test as follows.

Experimental Example 1. Heating /

The purpose of this test is to test the fire resistance of the fireproof coating material by applying the fireproof coating material to the structural parts of beams and posts such as general buildings, factory buildings, and hazardous materials storage and treatment facilities. Specifically, a thermocouple was installed at uniform intervals on the steel plate and the plywood, and then the refractory covering material was painted and subjected to a heating test for 3 hours, so that the foamed coating of the refractory covering material was heat- As shown in Fig. At this time, a torch lamp was used as a heat source. The fire resistance performance is managed separately from the Korean industry standard (KS) by the heat capacity and the secondary performance. For the heat performance, the average temperature should be within T ₀ +140 ° C for the initial temperature (T ₀ ) ₀ + 180 ° C should not be exceeded. In the case of wood, there should be no flame propagation on the back.

Experimental Example 1: Fire resistance performance test

FIG. 3 shows the results of the fire resistance test of the refractory coating composition of Example 1 with respect to the iron plate, and the results are shown in Table 1 below.

As a result, as shown in Table 1 below, it was found that the fire resistance performance of the standard for the above-mentioned fire resistance condition was satisfied.

The standard temperature curve for the fire test is shown in Fig.

Therefore, it can be seen from the above-mentioned experimental results that the composition for fire-resistant fire-resistant coating of organic / inorganic composite according to the present invention is excellent in the ability to prevent flame blocking and fire temperature rise in case of fire.

Claims (5)

(a) 25 to 75% by weight of expandable graphite (MGP) whose particle size is adjusted to 5 to 54 micrometers and 25 to 75% by weight of a sericite powder having a particle size of 1 to 54 micrometer are mixed 5 to 40% by weight of the inorganic mixed powder;
(b) 10 to 20% by weight of ammonium polyphosphate as a dehydrate agent;
(c) 15 to 25% by weight of melamine as a foaming agent;
(d) 5 to 10% by weight of a water-soluble acrylic emulsion resin as a binder; And
(e) a mixture of 75 wt% alcohol and 25 wt% water as a solvent, and 30-40 wt% The method according to claim 1,
Wherein a mixture of 75% by weight of alcohol and 25% by weight of water is used as the solvent. The method according to claim 1,
Wherein the alcohol used in the solvent is one or two selected from the group consisting of ethyl alcohol, methyl alcohol, propyl alcohol and butyl alcohol. The method according to claim 1,
Wherein the expandable graphite (MGP) is an expandable graphite having a particle size of 5 to 54 micrometers. The method according to claim 1,
The composite material according to claim 1, wherein the warp-resistant powder is one having a particle size of 1 to 54 micrometers.

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