JP3181152B2 - Composition for fireproof coating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire-resistant coating for coating various structural members such as structural members of steel-framed buildings, ceramic sizing materials, cement sizing materials, metal members, resin members, and wooden members. The present invention relates to a composition for use.

[0002]

2. Description of the Related Art A fire-resistant structure covering a structural member of a steel-framed building such as a steel beam material has a fire-resistant performance that is determined by the building standard law, Article 107, in each part of a building such as a wall, a floor, and a column. The fire resistance time is specified in accordance with JIS A1304 as a specific test method of the fire resistance performance in the notification method of the Ministry of Construction, No. 2999 of 1969, “Method of Designating Fire Resistance Structure”.
"Fire resistance test method for building structural parts" is specified. Specifically, the fire resistance performance test according to JIS A1304 includes a heating test, a load heating test, and an impact test. For example, in the heating test method, a 30 minute fire resistance test, a 1 hour fire resistance test, a 2 hour fire resistance test, and a 3 hour The temperature of the structural member where the refractory coating material was applied in the furnace heated to about 1000 ° C. was divided into the fire resistance test and the average temperature was 350
The temperature must not exceed ℃.

[0003] In order to satisfy such fire resistance performance standards, various types of fire-resistant coating materials, including a wet type and a dry type, have been tried, and one example is a fire-resistant coating composition described in JP-B-2-28555. This is because aluminum hydroxide and carbonate are blended in hydraulic cement, the endothermic effect of the dehydration reaction of aluminum hydroxide and the decomposition reaction of carbonate during heating, and the incombustible steam gas and carbon dioxide generated during these reactions. The aim is to enhance the fire resistance using gas.

[0004]

The improvement in fire resistance means that the thickness of the fire-resistant coating material can be reduced. Therefore, in the case of fire-resistant coating materials, in addition to satisfying the above-mentioned fire resistance performance standards, from the viewpoint of reducing the load burden on structural members and shortening the construction period by making the construction thickness of the fire-resistant coating materials as thin as possible. However, there is a demand for a fireproof covering material having excellent fireproof performance. However, the above-mentioned composition for a fire-resistant coating does not sufficiently satisfy such a demand, and a composition for a fire-resistant coating capable of exhibiting even more excellent fire-resistant performance has been desired.

An object of the present invention is to provide a composition for a fire-resistant coating which is more excellent in fire resistance than existing ones in order to solve such problems.

[0006]

Means for Solving the Problems] refractory coating composition of the present invention, 100 in order to achieve the object, and d Torinjaito, with respect to the ettringite 100 parts by weight
Inorganic compound powder 5 releasing non-combustible gas at 1000 ° C.
Or 500 parts by weight of the composition for refractory coating, or the ettringite, and the ettringite 10
0 to 50 parts by weight of a titanium oxide powder particle to 0 part by weight, or a composition for a fire-resistant coating containing the ettringite, and 100 parts by weight of the ettringite, the inorganic compound powder 5 It is a composition for a fire-resistant coating comprising about 500 parts by weight and 0.01 to 50 parts by weight of titanium oxide particles.

FIG. 1 is a graph showing a temperature rise pattern of a structural member coated with a refractory material in the above-mentioned heating test.
The temperature rises to 00 ° C. (a), and stagnates at 100 ° C., which is the boiling point of water, while the moisture contained in the refractory coating material is released as steam gas (b), and then the temperature rises with time (c) ), The time required 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 rise area (c), the smaller the fire resistance. 350 ° C
, The fire resistance time is prolonged, and it can be said that the fire resistance performance is good.

[0008] Ettringite is a hydrated sulfate of calcium and aluminum having large voids between crystal skeletons, and the voids contain as much as about 45 to 55% by weight of water of crystallization. Ettringite used in the present invention may be naturally occurring or artificially synthesized. In ettringite, when heated, the water of crystallization starts to be released from the crystal skeleton at around 60 ° C., and the water of crystallization is released as incombustible steam gas. This has the effect of extending the stagnation region (b) at 100 ° C. Also, when kneaded with water, it becomes enameled and hardens, and also functions as a binder.

As the inorganic compound powder, 100 to 100%
Hydrate of inorganic compound or inorganic carbonate which releases non-flammable gas of water vapor or carbon dioxide by release or decomposition reaction of water of crystallization in the temperature range of 1000 ° C. Granules are used, but those which release 10% or more of their weight as nonflammable gas are preferred. Specifically, aluminum hydroxide that produces steam gas at 200 to 250 ° C., calcium carbonate that produces carbon dioxide gas at about 800 ° C., bentonite and sepiolite that produces steam gas at about 900 ° C., steam gas at about 150 ° C. And baking soda that produces carbon dioxide gas, magnesium hydroxide that produces steam gas at about 400 ° C., and the like. One of these may be used alone, or two or more may be used in combination. . The particle size of the inorganic compound powder is not particularly limited, but the average particle size is 1.0 mm in order to achieve uniform mixing of the refractory coating composition.
Less than or equal to the degree is desirable.

In the above-mentioned inorganic compound powder, the temperature rise is suppressed during the generation of the non-combustible gas because heat is taken away for the gas generation, and the temperature in the temperature rise region (c) of FIG. The gradient becomes smaller. If the amount of the inorganic compound powder is less than 5 parts by weight with respect to 100 parts by weight of the ettringite, there is almost no effect of reducing the temperature gradient. The blending amount decreases, the effect of extending the stagnation region (b) at 100 ° C. decreases, and curing becomes difficult. Therefore, the blending amount of the inorganic compound powder needs to be in the range of 5 to 500 parts by weight based on 100 parts by weight of ettringite. Particularly preferred compounding 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.
It is desirably about 0 mm or less. If the amount of the titanium oxide powder is less than 0.01 part by weight with respect to 100 parts by weight of the ettringite, there is almost no effect of lowering the thermal conductivity. Since the effect of lowering the thermal conductivity is saturated, there is no point in blending a large amount. Therefore, the amount of the titanium oxide powder should be in the range of 0.01 to 50 parts by weight based on 100 parts by weight of ettringite. Particularly preferred compounding amount is 5-2.
0 parts by weight.

Further, in addition to the above-mentioned components, various materials for improving the function of the composition for fire-resistant coating may be arbitrarily compounded within a range not to impair the fire-resistance performance. For example, hydraulic cement for strength improvement and cost reduction, lightweight aggregates such as obsidian perlite, perlite perlite, fired vermiculite, shirasu balloon, etc. to promote weight reduction,
Water glass for improving strength, fibers such as alkali-resistant glass fiber and ceramic fiber for preventing cracks, and water retention agent for improving workability can be blended. The above may be used in combination.

[0013]

In the heating process, the water of crystallization of ettringite, which is a characteristic component of the refractory coating composition of the present invention, begins to be liberated at about 60 ° C., and while steam gas is generated and released, The heat absorption suppresses the temperature rise of the refractory coating material, and the temperature rise of the structural member stagnates at 100 ° C. In addition, ettringite has as much as 45 to 55% by weight of crystallization water, and a conventional refractory material utilizing the endothermic effect of the release of crystallization water, for example, water of crystallization of aluminum hydroxide 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 since the crystal water is released from the crystal skeleton in a low temperature range, the stagnation zone (b) of the structural member at 100 ° C becomes longer, and excellent fire resistance is exhibited.

The inorganic compound particles absorb heat in a temperature range of 100 to 1000 ° C. to cause a release or decomposition reaction of water of crystallization. The heat absorption suppresses a temperature rise of the refractory coating material, and a temperature rise of the structural member does not occur. The fire resistance time can be extended by reducing the temperature gradient in the temperature range of 100 ° C. or higher, that is, the temperature rise range (c) in FIG. like this
In addition, the temperature rise pattern differs from ettringite
By blending powdered organic compound with ettringite
Thus, synergistically excellent fire resistance is exhibited.

The non-combustible gas resulting from the ettringite and the inorganic compound powder not only has an endothermic effect at the time of generation, but also delays heat conduction by forming a non-combustible gas layer. Performance can be improved.

Further , the titanium oxide powder blocks the radiant heat and lowers the thermal conductivity, so that it has the effect of extending the refractory time immediately after heating. Thus , ettringite is temperature
Titanium oxide with different rising patterns to ettringite
By blending, synergistically excellent fire resistance performance is exhibited. Furthermore, mineralization with different temperature rise patterns
Ethrin using both the compound powder and titanium oxide
Even more synergistically excellent by blending with Kite
It exhibits excellent fire resistance performance.

Therefore, when a refractory coating material is formed from each of the refractory coating compositions of the present invention, the same refractory performance can be exhibited even when the construction thickness is reduced as compared with the conventional refractory composition. In addition to reducing the load on structural members,
The construction time and curing period can also be shortened. In addition, by optionally blending the above-mentioned other refractory materials into the refractory composition, it is possible to improve the strength, reduce the weight, prevent cracks, improve the workability of the refractory coating material, and reduce the cost. Can be easily performed.

[0018]

EXAMPLES Next, specific examples of the composition for refractory coating of the present invention will be described.

In preparing the refractory coating composition, ettringite having a water content of 46% by weight as main refractory material, aluminum hydroxide having an average particle diameter of 0.1 mm as 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. Further, white cement, pearlite having an average particle size of 2.5 mm, and alkali-resistant glass fiber were used as optional materials.

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

In the fire resistance test, the mixture 25
Add 13 liters of water per kg, knead, apply 15mm thick on both sides of iron plate of width 100mm x length 100mm x thickness 1.5mm, then cure and cure at 25 ° C and 70% humidity for 28 days. Body.

A thermocouple was attached to the surface of the iron plate and the refractory coating material of the test piece and placed in a heating furnace.
According to the method of 4, the heating furnace was heated so that the surface temperature of the refractory coating material became 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 fire resistance time.

The test results are shown in Tables 1 and 2.

[0024]

[Table 1]

[Table 2] As is clear from the results in Table 1, Examples 1 to 1 of the present invention were used.
No. 4 could be a fireproof covering material having excellent fireproof performance.
Further, the combined use of non-aircraft compounds granular material and a titanium oxide powder and granular material was still E sure to improve even more fire resistance.

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

[Brief description of the 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 rise area

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI C04B 28/14 C04B 28/14 C09D 1/00 C09D 1/00 5/00 5/00 Z E04B 1/94 E04B 1/94 T (58) Field surveyed (Int. Cl. ⁷ , DB name) C04B ^7/ 00-28/36

Claims (3)

(57) [Claims] 1. An ettringite, and said ettringite.
Incombustible gas at 100-1000 ° C for 100 parts by weight
5 to 500 parts by weight of an inorganic compound powder that releases
A composition for a refractory coating, comprising: 2. Ettringite and said ettringite
Titanium oxide powder 0.01 to 5 parts by weight per 100 parts by weight
0 parts by weight for refractory coatings
Composition. 3. Ettringite and said ettringite
Incombustible gas at 100-1000 ° C for 100 parts by weight
5 to 500 parts by weight of an inorganic compound powder which releases
0.01 to 50 parts by weight of titanium oxide powder
A composition for a refractory coating, comprising: