JPH09188577A - Refractory coating material, formation of refractory coated layer and refractory coated structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a refractory coating material excellent in refractory performances, capable of actualizing deceleration of rise in temperature on the surface of a steel material, etc., to be used, comprising a specific blending condition of at least a hydraulic cement-containing inorganic binder, an endothermic substance and a fixed lightweight aggregate. SOLUTION: This refractory coating material at least comprises 100 pts.wt. of a hydraulic cement-containing inorganic binder (e.g. Portland cement), 15-500 pts.wt. of an endothermic substance (e.g. aluminum hydroxide) and 12-220 pts.wt. of a lightweight aggregate obtained by blending an inorganic lightweight aggregate (e.g. perlite) with an organic lightweight aggregate (e.g. foamed PS) having preferably 0.1-3mm particle diameter in the ratio of 2:1 to 20:1 in the ratio of 100-300vol. pts. based on 100 vol.pts. of the total of the inorganic binder and the endothermic substance. The refractory coating material is added to water to prepare a mortar to be hardened, which is applied to a structural member by spraying or troweling to form a refractory coated layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire-resistant covering material, a method for forming a fire-resistant covering layer, and a fire-resistant covering structure for protecting, for example, high-rise buildings, parking lots and the like having a steel structure from a fire or the like.

[0002]

2. Description of the Related Art Conventionally, steel structures such as high-rise buildings and parking lots having a steel structure are softened and deformed due to a high temperature in a fire, so that the buildings are not collapsed. It is stipulated to cover with a covering material.

When a material having only a heat insulating effect, for example, a coating material mainly made of rock wool is used as a fire-resistant coating material, in order to keep the steel material at a specified temperature or less,
Since the construction thickness must be increased, a method for reducing the construction thickness by using a material that is endothermic at high temperatures is being studied in recent years.

For example, Japanese Patent Application Laid-Open No. 61-77687 discloses a refractory composition containing a hydraulic cement, a lightweight aggregate and a substance having a high degree of hydration, which is mixed with water. It is used as a sprayed refractory coating material.

[0005]

However, in the conventional composition, although there is no problem in the heating temperature curve in the fire resistance test for 1 hour to 3 hours, further improvement in fire resistance is required.

[0006] In recent years, there has been a demand for a composition which passes not only in Japan but also in a test method adapted to those in Europe and the United States. An object of the present invention is to provide a fire-resistant coating material having excellent fire-resistance performance, a method of forming a fire-resistant coating layer, and a fire-resistant coating structure capable of realizing a slowed temperature rise on the surface of a steel material or the like to be used. .

[0007]

According to a first aspect of the present invention, there is provided a method for manufacturing a fuel cell, comprising: an inorganic binder containing at least 100 parts by weight of hydraulic cement; It consists of 12 parts by weight to 220 parts by weight of a lightweight aggregate obtained by mixing the aggregate and the organic lightweight aggregate in a ratio of 2: 1 to 20: 1, and based on 100 parts by volume of the total of the inorganic binder and the endothermic substance. The gist of the present invention is a fire-resistant covering material, wherein the lightweight aggregate is 100 to 300 parts by volume.

[0008] The invention of claim 2 is that the heat absorbing substance is 15 to 500 parts by weight, the inorganic lightweight aggregate and the organic lightweight aggregate are 2: 1 to 20 parts by weight with respect to 100 parts by weight of the inorganic binder containing at least hydraulic cement. : 12 parts by weight to 220 parts by weight of a lightweight aggregate compounded in a ratio of 1: 1 and an inorganic filler 300
The refractory coating material is characterized in that the lightweight aggregate is 100 to 300 parts by volume with respect to 100 parts by volume of the inorganic binder, the endothermic substance, and the inorganic filler in addition to the parts by weight. I do.

According to a third aspect of the present invention, a curable mortar (for example, a slurry) prepared by adding water to the refractory coating material of the composition according to the first or second aspect is sprayed or troweled. The gist of the present invention is a method for forming a fire-resistant coating layer, which is formed on a member as a fire-resistant coating layer.

A fourth aspect of the present invention provides a method for forming a refractory coating layer according to the third aspect, wherein the cured product of the refractory coating layer has an air-drying specific gravity of 0.6 to 1.5. And According to a fifth aspect of the present invention, there is provided a fire-resistant coating structure characterized in that a fire-resistant coating layer obtained by hydrogenating and curing the fire-resistant coating material of the composition according to the first or second aspect is constructed on the surface of a steel structural member. And

According to a sixth aspect of the present invention, there is provided a fire-resistant coating structure according to the fifth aspect, wherein the cured product of the fire-resistant coating layer has an air-drying specific gravity of 0.6 to 1.5. .

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, each component of the present invention will be described in detail. (1) The inorganic binder is selected from hydraulic lime, portland cement, alumina cement, lime mixed cement, mixed portland cement, high sulfate slag cement and the like in the case of a binder hardened by water and / or moisture. Hydraulic cement is an essential component. Alternatively, in addition to the hydraulic cement, an air-hardening cement selected from gypsum, dolomite, magnesia cement and the like can be added and used.

(2) An endothermic substance is defined as a substance which, when heated, undergoes thermal decomposition to generate water. For example,
Examples of substances that lose weight when heated from 100 ° C. to 600 ° C. include aluminum oxide hydrates such as aluminum hydroxide, gibbsite mineral, boehmite, and diaspol, and chabazite, heurandite, and mordenite. Zeolite materials, silica-alumina materials such as allophane, halloysite, non-foamed or expanded vermiculite, magnesia materials such as brucite and attapulgite, and other materials such as satin white, ettringite, dolomite and boric acid are included.

Aluminum hydroxide is a material that is particularly suitable as an endothermic substance because it has an O in the total molecular weight of the molecular structure.
This is because it is considered that the ratio of the H group is larger than other substances, that the production amount is large, that it is easily available, and that it is safe. (3) The lightweight aggregate in the present invention refers to an inorganic lightweight aggregate and an organic lightweight aggregate.

The inorganic lightweight aggregate is formed by expanding expanded vermiculite, perlite, expanded shale, pumice, shirasu balloon, etc., which are expanded or expanded substances of natural minerals, as well as expanded silica gel and various slags. Artificial lightweight aggregates such as foamed material, glass scrap granulated and foamed, clay powder granulated and foamed, and the like. Among these, the expanded or foamed substance is preferably not vitrified as much as crystallized and has a low bulk specific gravity, and is preferably expanded vermiculite, perlite, pumice stone, and shirasu balloon.

As the organic lightweight aggregate, a synthetic resin or rubber foam is used, for example, polystyrene,
Examples include polyethylene, polyethylene-vinyl acetate copolymer, polypropylene, polyurethane, polyvinyl chloride, polyvinylidene chloride, natural rubber, and synthetic rubber. Of these, polystyrene, polyethylene, polyethylene-vinyl acetate copolymer, polyurethane, and polyvinyl chloride are desirable, and their shapes can be granular, foamed, and the like. Note that the material may be light as long as it is not a foam, and for example, a fibrous or non-woven material may be used.

When these organic lightweight aggregates have a particle size range of 0.1 to 3.0 mm,
Be more effective. This is because when the organic lightweight aggregate in this range is used, workability and smoothness are improved. When the organic lightweight aggregate has a particle size smaller than 0.1 mm, the amount of water for obtaining a predetermined flow value increases, and the workability decreases. Conversely, when a material larger than 3.0 mm is used, the smoothness of the surface is reduced.

By using these organic lightweight aggregates, the heat insulating effect is excellent in the low temperature region where the steel material temperature is around 100 ° C., and the degree of temperature rise thereafter becomes gentle. (4) The inorganic filler is a substance selected from powders such as refractory clay, refractory oxides, silica sand, lime, etc., and by proper mixing, improves spraying workability, cracking property, and surface smoothness. Is obtained.

(5) The mixing ratio of these essential components is as follows. The invention according to claim 1 Inorganic binder 100 parts by weight Endothermic substance 15 to 500 parts by weight Light aggregate 12 to 220 parts by weight Ratio of inorganic lightweight aggregate to organic lightweight aggregate 2: 1 to 20: 1 The volume is as follows.

Inorganic binder and endothermic substance 100 parts by volume Light aggregate 100 to 300 parts by volume Invention of claim 2 Inorganic binder 100 parts by weight Endothermic substance 15 to 500 parts by weight Light aggregate 12 to 220 parts by weight Inorganic filler 300 Parts by weight or less Ratio of inorganic lightweight aggregate to organic lightweight aggregate 2: 1 to 20: 1 The volume parts of the essential components are as follows.

Inorganic binder, endothermic substance, and inorganic filler: 100 parts by volume Light aggregate: 100 to 300 parts by volume Here, the blending amount of the endothermic substance with respect to 100 parts by weight of the inorganic binder is in the range of 15 to 500 parts by weight. However, when the amount is less than 15 parts by weight, the degree of slowing down of the temperature rise of the steel material due to heat absorption is small and the fire resistance is inferior. 5
When the amount exceeds 00 parts by weight, the amount of the binder is relatively small, and the strength required for practical use cannot be obtained.

Similarly, the amount of the lightweight aggregate is 12 to 22.
It is selected from the range of 0 parts by weight, but when it is less than 12 parts by weight, workability and fire resistance are inferior, and when it exceeds 220 parts by weight, the amount of kneading water of the mortar increases, and the mortar strength decreases. , Causing cracking.

According to the second aspect, the amount of the inorganic filler is 3
It is selected from 00 parts by weight or less, but when it exceeds 300 parts by weight, the amounts of the binder and the heat absorbing material are relatively reduced, and the strength required for practical use cannot be obtained,
Poor fire resistance.・ The ratio of inorganic lightweight aggregate to organic lightweight aggregate is 2: 1 to 1
20: 1 range, but when it is less than 2: 1
Although excellent in the heat insulating effect in the low temperature region near 100 ° C., a large amount of organic lightweight aggregate burns to increase the calorific value, resulting in an increase in the temperature of the steel material. The heat insulation effect can be expected.

The light-weight aggregate is 1 part per 100 parts by volume of the inorganic binder, the heat absorbing substance and the inorganic filler (in claim 2).
Selected in the range of 100 to 300 parts by volume,
When the amount is less than 0 parts by volume, the heat insulating property, the spraying workability, and the crack resistance are poor. When the amount exceeds 300 parts by volume, the strength, fire resistance and smoothness of the mortar are inferior.

(6) Other than the above-mentioned components, fibrous materials such as glass fiber, rock wool fiber, pulp fiber, etc. may be used as a material for preventing cracking of the refractory coating layer, which is a cured product, and adjusting the viscosity of the composition. Surfactants, as anti-sagging agents for compositions and anti-separation agents and viscosity modifiers for compounds, as well as cellulose-based water-soluble resins and liquid synthetic resin emulsions or synthetic resin powders that become emulsions when mixed with water, An appropriate amount can be blended within a range that does not impair the fire resistance performance and has no problem in mechanical strength and adhesion.

(7) When using the refractory coating material of the present invention, the mortar is mixed with an appropriate amount of water, and mortar is adjusted to the coating means. What is necessary is just to cover the target substrate to be covered. (8) The air-drying specific gravity of the cured product is selected in the range of 0.6 to 1.5. If it is smaller than 0.6, the strength, fire resistance and smoothness of the mortar are inferior. When it exceeds, the heat insulating property, the spraying workability and the crack resistance are inferior.

(9) The mortar made of the refractory coating material of the present invention is applied to the surface of the steel structural member by spraying or the like, and then cured to provide an excellent refractory coating layer on the surface of the steel structural member. A fire-resistant coated structure having fire-resistant performance can be obtained.

[0028]

The present invention will be described below with reference to examples. Here, the following tests were performed to confirm the performance according to the examples, and the respective performances were obtained.

(1) First, as a fire resistance test, J
A fire test was performed according to ISA 1304 “Fire Test Method for Building Structure”. In the fire resistance test, heating was performed according to the heating curve of JIS, and the fire was stopped in 2 hours.
The presence or absence of peeling or falling off was confirmed. The steel temperature at the time of temperature rise (see FIGS. 1 to 3) or the steel temperature at the end of heating (see Tables 5 and 6) were also recorded.

(2) In the workability test, using a snake-type pumping machine and a spray gun, which are used when spraying lightweight cement for walls, the spraying operation is performed for 5 hours, and the machine is clogged. It was confirmed that there was no load and that it could be used without any problems. (3) In the test of smoothness, a mold having a width of 30 cm to obtain a thickness of 40 mm is installed on a steel material, and a mortar adjusted to a flow value of 160 ± 20 mm is filled therein, and then a metal die is formed. Then, the surface was pressed, and the state of the surface after curing was observed to determine whether the surface was cured properly.

(4) In the test for cracking property, the test piece whose smoothness has been checked is placed in a constant temperature room at 20 ° C. and 65% RH and cured for one week, and it is confirmed whether or not cracking has occurred on the test piece surface. did. (5) In the strength test, a test body was prepared by a method according to JASS15M-102, a compression test was performed, and 10 k
gf / cm ² or more was confirmed.

Tables 1 and 2 below show examples (Examples 1 to 1).
The composition of the refractory coating material as 10) is shown. In addition, the numerical value of the upper part in the table shows the mixing ratio by weight part, and the numerical value of the lower part shows the mixing ratio by volume part (however, the volume ratio and the air-dry specific gravity are excluded). In calculating this volume, the bulk specific gravity of each component was calculated as follows: Portland cement; 1.2, dolomite plaster; 0.7, aluminum hydroxide; 1.2, fly ash; 0.9, calcium carbonate; 49, perlite; 0.2, expanded vermiculite; 0.15, expanded styrene: 0.067.

[0033]

[Table 1]

[0034]

[Table 2]

Tables 3 and 4 below show Comparative Examples (Comparative Examples 1 to 4).
7) shows the composition of the refractory coating material.

[0036]

[Table 3]

[0037]

[Table 4]

In Tables 1 to 4, when the inorganic binder is A component, the endothermic component is B component, the inorganic lightweight aggregate is C component, and the organic lightweight aggregate is D component,
The characteristics of the components of No. 10 and Comparative Examples 1 to 7 are as follows. -Example 1; C and D components are slightly higher-Example 2; C and D components are moderate-Example 3; B and D components are slightly higher and C components are lower-Example 4; B components are slightly higher-Example 5 -Example 6; A component less-Example 7; B component slightly less-Example 8; D component less-Example 9; D component slightly more-Example 10; C component slightly less, no powder emulsion-Comparative example 1; no D component ・ Comparative Example 2: no C component, the volume ratio is more than 3 times ・ Comparative Example 3: no D component ・ Comparative Example 4: slightly larger B component, no D component ・ Comparative Example 5;・ Comparative Example 6: C component slightly less, D component too much ・ Comparative Example 7: B component slightly larger, no D component, volume ratio is 1
Below, Tables 5 and 6 show various performance results of Examples and Comparative Examples. The evaluation criteria for the determination were as follows.

Evaluation of workability test ○ Work without clogging and overloading × No problem in construction due to clogging or overloading Evaluation of smoothness test ○ Not smoothed down × Smoothly pressed Cracking evaluation ○ Crack None △ Hair cracks are generated × Cracks are generated Evaluation of strength ○ Compressive strength is 10 kgf / cm ² or more × Compressive strength is 10 kgf / cm ² or more

[0040]

[Table 5]

[0041]

[Table 6]

As is evident from Tables 5 and 6, the composition of this example was excellent in workability, smoothness, cracking and compressive strength, and was suitable. On the other hand, the composition of the comparative example is inferior in any of workability, smoothness, cracking and compressive strength, and is not preferred.

FIGS. 1 to 3 show the temperature change during the temperature rise. As shown in FIG. 1, the composition of Example 7 had a gradual rise in temperature, and did not reach 350 ° C. even after 120 minutes. In FIG. 1, the reason why the temperature rise is stopped for a long time at around 100 ° C. seems to be that the added organic lightweight aggregate absorbs a large amount of heat from the outside when the added material changes in quality such as melting. It is. Thereby, it is determined that the subsequent temperature rise is also suppressed.

As shown in FIG. 2, the case where the organic light-weight aggregate of Comparative Example 3 was not used had a steep temperature rise, and after 120 minutes, exceeded 350 ° C., which was not preferable. As shown in FIG. 3, in the case where the organic lightweight aggregate of Comparative Example 6 excessively contained, the temperature rise was gradual at the beginning of heating, but then changed to a sharp rise in temperature, and exceeded 350 ° C. after 120 minutes. Not preferred.
In FIG. 3, the reason why the temperature rise stopped to some extent around 100 ° C. is considered to be that the added organic lightweight aggregate absorbs a large amount of heat from the outside when it undergoes deterioration such as melting. The rapid rise in the temperature is thought to be due to an increase in the amount of heat generated by burning a large amount of the organic lightweight aggregate.

It should be noted that the present invention is not limited to the above-described embodiment at all, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

[0046]

As described in detail above, the inventions of claims 1 to 6 have a remarkable effect that the temperature rise on the surface of the steel material used is slowed down. For example, it is excellent in heat insulation at a relatively low temperature portion of steel material. In addition, it can pass in the test method according to the test method of European and American countries

[Brief description of the drawings]

FIG. 1 is a graph showing experimental results of Example 7.

FIG. 2 is a graph showing experimental results of Comparative Example 3.

FIG. 3 is a graph showing experimental results of Comparative Example 6.

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 000251277 Suzuka Fine Co., Ltd. 1 Shiohama-cho, Yokkaichi-shi, Mie (71) Applicant 592067395 Nippon Kasei Co., Ltd. 7-21-1, Nishishinjuku, Shinjuku-ku, Tokyo (71) Applicant 390025612 Fujikawa Construction Materials Co., Ltd. Township, Kazuo Watanabe, 2-7-1457, Matsumotocho, Kakamigahara-shi, Gifu Prefecture, Kikusui Chemical Industry Co., Ltd. Inventor Takemi Yada Ichiba Shiohama-cho, Yokkaichi-shi, Mie Prefecture Suzuka Fine Co., Ltd. Kishi Saitama Prefecture Hiki-gun Namerikawa-cho, Odaigo 25-25, 11 Japan Chemical Industry Co., Ltd.Central Research Laboratories (72) Inventor Susumu Harada 13th Torihama-cho, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Fujikawa Construction Materials Industry Co., Ltd.

Claims (6)

[Claims] 1. An endothermic substance of 15 parts by weight to 50 parts by weight based on 100 parts by weight of an inorganic binder containing at least hydraulic cement.
0 parts by weight, inorganic lightweight aggregate and organic lightweight aggregate 2: 1 to 1
12: 1 by weight of lightweight aggregate blended at a ratio of 20: 1 to 2
20 weight parts, and the lightweight aggregate is 10 weight parts per 100 volume parts of the inorganic binder and the heat absorbing substance.
A fire-resistant covering material having a volume of 0 to 300 parts by volume. 2. An endothermic substance of 15 parts by weight to 50 parts by weight with respect to 100 parts by weight of an inorganic binder containing at least hydraulic cement.
0 parts by weight, inorganic lightweight aggregate and organic lightweight aggregate 2: 1 to 1
12: 1 by weight of lightweight aggregate blended at a ratio of 20: 1 to 2
20 parts by weight and 300 parts by weight or less of the inorganic filler are added, and the lightweight aggregate is added to 100 parts by volume of the inorganic binder, the heat absorbing substance and the inorganic filler in total.
A fire-resistant covering material having a volume of 00 to 300 parts by volume. 3. A curable mortar prepared by adding water to a refractory coating material of the composition according to claim 1 or 2,
A method for forming a fireproof coating layer on a structural member by spraying or ironing. 4. The method for forming a fire-resistant coating layer according to claim 3, wherein the cured product of the fire-resistant coating layer has an air-drying specific gravity of 0.6 to 1.5. 5. A fire-resistant coating structure comprising a fire-resistant coating layer obtained by hydrogenating and curing a fire-resistant coating material of the composition according to claim 1 or 2 on a surface of a steel structural member. 6. The fire-resistant coating structure according to claim 5, wherein the cured product of the fire-resistant coating layer has an air-drying specific gravity of 0.6 to 1.5.