JPH0761841A - Fireproof coating composition - Google Patents

Abstract

(57) [Summary] [Purpose] It is an object of the present invention to provide a composition for fireproof coating which is more excellent in fireproof performance than existing ones. [Structure] The fire-resistant coating composition of the present invention is characterized in that it basically contains ettringite as a main component. Furthermore, 100 to 100 parts by weight of the ettringite and the ettringite are used.
Inorganic compound granules 5 that emit noncombustible gas at 1000 ° C
To 500 parts by weight, or the above-mentioned ettringite and the above-mentioned ettringite 1
A composition for refractory coating, which comprises 0.01 to 50 parts by weight of titanium oxide particles with respect to 00 parts by weight, the ettringite and the inorganic compound particles with respect to 100 parts by weight of the ettringite. A fire-resistant coating composition containing 5 to 500 parts by weight and titanium oxide powder of 0.01 to 50 parts by weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof coating composition for coating structural members of a steel building.

[0002]

2. Description of the Related Art Fire-resistant structures for covering structural members of steel-framed constructions such as steel beam materials have a fire-resistant performance in accordance with Article 107 of the Building Standards Act ordinance on each part of the building such as walls, floors and columns. According to JIS A1304, a concrete test method of the fire resistance performance is specified in the Ministry of Construction Notification No. 2999 “Method of Designating Fire Resistant Structure”.
"The fire resistance test method for building structures" is specified. Specifically, the fire resistance performance test according to JIS A1304 is composed of a heating test, a load heating test, and an impact test. For example, in the heating test method, a 30-minute fire-resistant test, a 1-hour fire-resistant test, a 2-hour fire-resistant test, and a 3-hour fire-resistant test. The temperature of the structural member, which is classified into the fire resistance test and in which the fire resistant coating material is applied in the furnace heated to about 1000 ° C., has an average temperature of 350 within each of the above-mentioned times.
It must not exceed ℃.

In order to satisfy such fire resistance performance standards, various fire resistant coating materials including wet type and dry type have been tried, and an example thereof is the fire resistant coating composition described in Japanese Patent Publication No. 28555/1990. This is because hydraulic cement and aluminum hydroxide and carbonate are mixed, and the endothermic action by dehydration reaction of aluminum hydroxide and decomposition reaction of carbonate during heating, and non-combustible steam gas and carbon dioxide generated during these reactions. The purpose is to improve the fire resistance by using gas.

[0004]

By the way, the improvement of the fire resistance performance means, in other words, the construction thickness of the fire resistant coating material can be reduced. Therefore, in the fireproof coating material, in addition to satisfying the fireproof performance criteria as described above, from the viewpoint of reducing the load burden on the structural member and shortening the construction period by making the construction thickness of the fireproof coating material as thin as possible. In particular, a fireproof coating material having excellent fireproof performance is desired. However, the above-mentioned fire-resistant coating composition does not sufficiently meet such a demand, and there is a demand for a fire-resistant coating composition capable of exhibiting even more excellent fire resistance performance.

The present invention is intended to solve the above problems and to provide a composition for fireproof coating which is more excellent in fireproofness than existing ones.

[0006]

The fire-resistant coating composition of the present invention is characterized by basically containing ettringite as a main component in order to achieve the above-mentioned object.

Further, the present invention provides the above-mentioned ettringite, and 100 to 100 parts by weight of the ettringite.
Inorganic compound granules 5 that emit noncombustible gas at 1000 ° C
To 500 parts by weight, or the above-mentioned ettringite, and the above-mentioned ettringite 10
A composition for refractory coating containing 0.01 to 50 parts by weight of titanium oxide particles with respect to 0 parts by weight, or the ettringite, and the inorganic compound particles 5 with respect to 100 parts by weight of the ettringite. It is a composition for refractory coating which comprises ˜500 parts by weight and 0.01 to 50 parts by weight of titanium oxide particles.

By the way, FIG. 1 is a graph showing a temperature rise pattern of the structural member coated with the refractory material in the above-mentioned heating test.
The temperature rises to 00 ° C. (a), the water contained in the refractory coating material stays at 100 ° C., which is the boiling point of water while being released as water vapor gas (b), and then the temperature rises with time (c ), The time to reach 350 ° C. is evaluated as the fire resistance time. As can be seen from FIG. 1, the longer the rising area (a), the longer the fire resistance time, the longer the stagnation area (b) at 100 ° C., the longer the fire resistance time, and the smaller the temperature gradient in the temperature rising area (c). 350 ° C
It can be said that the fire resistance performance is good because the fire resistance becomes longer and the fire resistance time becomes longer.

The above-mentioned ettringite is a hydrated sulfate of calcium and aluminum having a large void between crystal skeletons, and the void contains a large amount of crystal water of about 45 to 55% by weight. The ettringite used in the present invention may be naturally produced or artificially synthesized. When ettringite is heated, the water of crystallization begins to be released from the crystal skeleton from around 60 ° C., and the water of crystallization is released as a non-combustible water vapor gas. It has the effect of extending the 100 ° C stagnation region (b). When kneaded with water, it becomes an enamel and hardens, and also functions as a binder.

The inorganic compound powder is 100 to
Inorganic compound hydrate or inorganic carbonate powder or granular material, which releases water vapor gas or noncombustible gas of carbon dioxide gas by releasing or decomposing water of crystallization in the temperature range of 1000 ° C, or mineral powder mainly composed of these Although granules are used, those that release 10% or more by weight as a non-combustible gas are preferable. Specifically, aluminum hydroxide that produces steam gas at 200 to 250 ° C., calcium carbonate that produces carbon dioxide gas at approximately 800 ° C., bentonite and sepiolite that produces steam gas at approximately 900 ° C., vapor gas at approximately 150 ° C. Examples include sodium bicarbonate which produces carbon dioxide gas, magnesium hydroxide which produces steam gas at about 400 ° C., and one of these may be used alone, or two or more thereof may be used in combination. . The particle size of these inorganic compound powders is not particularly limited, but the average particle size is 1.0 mm in order to uniformly mix the refractory coating composition.
It is desirable that the degree is less than that.

In the above-mentioned inorganic compound particles, the temperature rise is suppressed because heat is taken away for the gas generation while the non-combustible gas is generated, and the temperature in the temperature rise region (c) in FIG. 1 is suppressed. The gradient becomes smaller. When the amount of the inorganic compound powder is less than 5 parts by weight relative to 100 parts by weight of the ettringite, there is almost no effect of reducing the temperature gradient, and when it exceeds 500 parts by weight, the amount of the ettringite is relatively small. As the blending amount decreases, the extension effect of the 100 ° C. stagnation region (b) decreases and the curing becomes difficult. Therefore, the blending amount of the inorganic compound powder is required to be in the range of 5 to 500 parts by weight with respect to 100 parts by weight of ettringite. Particularly preferable blending amount is 50 to 40
0 parts by weight.

The titanium oxide is very stable and does not decompose even in a high temperature range, and has an effect of blocking radiant heat and lowering the thermal conductivity of the refractory coating material. Therefore, in the temperature rise pattern of FIG. 1, there is an effect of extending the fire resistance time in all areas after the rising area (a) up to 100 ° C. Further, the particle size of the titanium oxide powder is not particularly limited,
The average particle size is 1. to ensure uniform mixing of the refractory coating composition.
It is preferably about 0 mm or less. If the amount of such titanium oxide powder is less than 0.01 parts by weight with respect to 100 parts by weight of ettringite, there is almost no effect of lowering the thermal conductivity, and even if it exceeds 50 parts by weight. Since the effect of lowering the thermal conductivity is saturated, there is no point in adding a large amount. Therefore, the amount of titanium oxide powder to be blended must be in the range of 0.01 to 50 parts by weight with respect to 100 parts by weight of ettringite. Particularly preferable blending amount is 5 to 2
0 parts by weight.

Further, in addition to the above-mentioned components, various materials for improving the function of the fireproof coating composition may be optionally blended within a range not impairing the fireproof performance. For example, hydraulic cement for strength improvement and cost reduction, lightweight aggregates such as obsidian perlite, pearlite perlite, calcined vermiculite, and shirasu balloon to promote weight reduction,
Water glass can be added to improve strength, fibers such as alkali glass fiber and ceramic fiber to prevent cracks, and water retention agent to improve workability. These two types can be added. The above can also be used together.

[0014]

EFFECT OF THE INVENTION During the heating process, water of crystallization of ettringite, which is a characteristic compounding ingredient of the fire-resistant coating composition of the present invention, begins to be liberated at about 60 ° C., and while steam gas is generated and released, Due to the endothermic effect, the temperature rise of the refractory coating material is suppressed and the temperature rise of the structural member stagnates at 100 ° C. Moreover, ettringite has 45 to 55% by weight of crystal water, and a conventional refractory material utilizing the endothermic action by the release of crystal water, for example, aluminum hydroxide crystal water described in Japanese Patent Publication No. 28555/1990. Is 2
Compared with 5 to 35% by weight, the amount of water of crystallization is extremely large and is released from the crystal skeleton in the low temperature region, so that the 100 ° C. stagnation region (b) of the structural member becomes long and excellent fire resistance performance is exhibited.

The inorganic compound powder granules absorb heat in the temperature range of 100 to 1000 ° C. to cause release or decomposition reaction of crystal water, and the endothermic action suppresses the temperature rise of the fireproof coating material and the temperature rise of the structural member. The refractory time can be extended by decreasing the temperature gradient in the temperature range of 100 ° C. or higher, that is, in the temperature rise range (c) in FIG. When such an inorganic compound powder is used in combination with ettringite, it exhibits synergistically superior fire resistance performance as compared with the case where ettringite is used alone.

Further, the non-combustible gas resulting from the ettringite and the inorganic compound powder and granules not only has an endothermic effect at the time of generation but also delays heat conduction by forming a non-combustible gas layer. It can improve performance.

Furthermore, since the titanium oxide powder granules block radiant heat and lower the thermal conductivity, they have the effect of extending the fireproof time immediately after heating. By blending such a titanium oxide powder or granules, a fireproof performance that is synergistically excellent is exhibited as compared with the case where ettringite is used alone or the case where a mixture of ettringite and an inorganic compound powder is used.

Therefore, if a fireproof coating material is formed from each of the fireproof coating compositions of the present invention, the same fireproof performance can be exhibited even if the construction thickness is thinner than that of the conventional fireproof composition. , In addition to reducing the load on the structural members,
The construction time and curing period can also be shortened. Further, by optionally blending the other refractory material as described above to the refractory composition, it is possible to improve the strength of the refractory coating material, reduce the weight, prevent cracks, improve the workability of work, and reduce the cost. Can be done easily.

[0019]

EXAMPLES Next, specific examples of the fire-resistant coating composition of the present invention will be described.

In preparing the composition for fireproof coating, ettringite having a water content of 46% by weight as a main fireproof material, aluminum hydroxide having an average particle diameter of 0.1 mm as an inorganic compound powder, and an average particle diameter of 0.1 mm Of calcium carbonate, bentonite having an average particle size of 0.2 mm, sepiolite having an average particle size of 1 mm, and titanium oxide having an average particle size of 1 μm were used. Further, white cement, pearlite having an average particle diameter of 2.5 mm, and alkali resistant glass fiber were used as an optional compounding material.

The above-mentioned materials were mixed in the proportions shown in Tables 1 and 2 below to obtain the fire-resistant coating compositions of Examples 1-15 and Comparative Examples 1-5. Fire resistance performance was tested by the method.

In the fire resistance test, the mixture 25
13 liters of water was added per 13 kg, and the mixture was kneaded, coated on both sides of an iron plate 100 mm wide x 100 mm long x 1.5 mm thick to a thickness of 15 mm, and then cured for 28 days at a temperature of 25 ° C and a humidity of 70% to test. I made it a body.

A thermocouple was attached to the surfaces of the iron plate and the fireproof coating material of the test body and placed in a heating furnace, and JIS A130 was used.
According to the method of 4, the heating furnace was heated so that the surface temperature of the refractory coating material reached a predetermined temperature, and the temperature of the iron plate was measured by the thermocouple. The time until the temperature of the iron plate reached 350 ° C was defined as the fireproof time.

The results of these tests are also shown in Tables 1 and 2.

[0025]

[Table 1]

[Table 2] As is clear from the results of Table 1, Examples 1 to 1 of the present invention
All of 5 could be fireproof coating materials having excellent fireproof performance. Further, by using the inorganic compound powder and titanium oxide powder together rather than using ettringite alone,
It was confirmed that the fire resistance was further improved.

On the other hand, in Comparative Examples 1 to 5 in which white cement was used instead of ettringite, the fire resistance time was short and the fire resistance performance was poor.

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[Procedure amendment]

[Submission date] June 9, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Added

[Correction content]

[Brief description of drawings]

FIG. 1 is a graph showing a temperature rise pattern of a structural member coated with a refractory material.

[Explanation of symbols] a ... rise area b ... 100 ° C stagnation area c ... temperature increase area

[Procedure amendment]

[Submission date] November 22, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

FIELD OF THE INVENTION The present invention relates to a fireproof coating composition for coating various building members such as structural members for steel-framed constructions, ceramic sizing materials, cement sizing materials, metal members, resin members and wooden members. It is about things.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

[0025]

[Table 1]

[Table 2] As is clear from the results of Table 1, Examples 1 to 1 of the present invention
5 are both obtained an excellent fire protection material fire performance.
It was also confirmed that the fireproof performance was further improved by using the inorganic compound powder and the titanium oxide powder in combination, as compared with the case where ettringite was used alone.

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Claims (4)

[Claims] 1. A fire-resistant coating composition comprising ettringite as a main component. 2. A refractory coating comprising ettringite and 5 to 500 parts by weight of an inorganic compound powder or granule that releases an incombustible gas at 100 to 1000 ° C. with respect to 100 parts by weight of the ettringite. Composition. 3. Ettringite and titanium oxide powder particles of 0.01 to 5 relative to 100 parts by weight of the ettringite.
A composition for refractory coating, characterized by containing 0 part by weight. 4. Ettringite, inorganic compound powder 5 to 500 parts by weight and titanium oxide powder 0.01 to 50 parts by weight based on 100 parts by weight of the ettringite, which releases a nonflammable gas at 100 to 1000 ° C. A fire-resistant coating composition comprising: