JPH0825810B2 - Water glass and fire resistant coating material with hydroxide compound - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fireproof coating material having improved fireproof performance.

[0002]

2. Description of the Related Art Conventionally, asbestos and rock wool-based fire-resistant coating materials have been dominated by fire-resistant coating materials by the spraying method. Wood is being developed.

[0003]

[Problems to be Solved by the Invention] Ministry of Construction Notification No. 2999
No., JIS A1304 stipulates a fire resistance performance standard for a fire resistant coating material used for a steel frame building in which beams and columns can have a fire resistant structure. The standard is to perform a 1-hour fire resistance test, a 2-hour fire resistance test, and a 3-hour fire resistance test on the beam portion and the column portion, and a beam that has been subjected to a fireproof coating material in a furnace heated to about 1000 ° C. The internal steel frame temperature of the pillar is
This means that the average temperature should not exceed 350 ° C in a predetermined time.

The general performance of the current non-asbestos and non-rock wool type fire-resistant coating materials is that the fire-resistant coating material has a thickness of 20 mm in the 1-hour fire-resistant test in the pillar portion and 30 mm in the 2-hour fire-resistant test.
The time fire resistance test is about 40 mm. That is, the thickness satisfying the 3-hour fire resistance test is about 40 mm, and with this thickness, it is not possible to spray to a predetermined thickness at one time, and since it has to be sprayed twice, the working efficiency in spraying work is considerably deteriorated.

It is an object of the present invention to provide a fireproof coating material having a thinner thickness and a high fireproof performance which satisfies the required fireproof performance.

[0006]

The refractory coating material according to the present invention is obtained by keeping water vapor gas generated by dehydration reaction of a hydroxide compound during heating between the refractory coating material with water glass for a long time. The feature is that heat conduction due to heating is delayed, and thereby higher fire resistance performance is realized.

It is composed of 40 to 300 parts by weight of water glass and 20 parts of hydroxide compound with respect to 100 parts by weight of hydraulic cement.
The gist is to have a composition of about 800 parts by weight. Further, it is desired to include 5 to 500 parts by weight of the inorganic lightweight aggregate. Further, it is desired to further contain 1 to 50 parts by weight of inorganic fiber. Furthermore, 1 to 3 parts of the re-emulsified synthetic resin powder are added.
It is desirable to include 100 parts by weight.

(Explanation of Specific Structure) Specific examples of the hydraulic cement include Portland cement, alumina cement, silica cement, blast furnace cement, fly ash cement, and sulfate resistant cement. The hydraulic cement is used for the purpose of improving the adhesive strength of the fire-resistant coating material to the steel frame under high temperature conditions and improving the mechanical strength of the fire-resistant coating material. Specific examples of the hydroxide compound include aluminum hydroxide ((Al (OH) ₃ )) and gibbsite. The hydroxide compound can be expected to have an endothermic effect by decomposing by heating during fireproofing and an effect of delaying heat conduction due to formation of a water vapor gas layer. The mixing ratio is 20 to 80 with respect to 100 parts by weight of hydraulic cement.
It is 0 part by weight, but preferably 100 to 500 parts by weight. If the compounding ratio of the hydroxide compound is below the lower limit, the decomposition endothermic action due to heating during fireproofing and the effect of delaying heat conduction due to the formation of the steam gas layer cannot be expected, and if above the upper limit, heating during fireproofing No further effect can be obtained by the decomposition and endothermic action by the above and the action of delaying the heat conduction due to the formation of the water vapor gas layer.

Specific examples of the water glass include those belonging to the first and second types of sodium metasilicate and in the form of powder or granules. Similar to hydraulic cement, water glass is used for the purpose of improving the adhesion strength of the fireproof coating material to the steel frame at high temperature, the mechanical strength, and the surface strength. Furthermore, water glass is a feature of the present invention, by delaying the vapor gas, which is an incombustible gas generated by the decomposition and endothermic reaction of the hydroxide compound, between the fireproof coating materials for a long time, delaying heat conduction. Is expected to work. The mixing ratio is 40 to 300 parts by weight with respect to 100 parts by weight of hydraulic cement, and preferably 50 to 2 parts.
It is 00 parts by weight. Most preferably, it is 100 to 200 parts by weight. If the compounding ratio of water glass is below the lower limit, the above effects cannot be expected, and if it is above the upper limit, further effects of the above actions cannot be expected, and the viscosity increases and coating work The sex becomes worse.

Next, examples of the inorganic lightweight aggregate include obsidian perlite and pearlite perlite, and more specific examples include unburned vermiculite. When unfired vermiculite is used, it is desirable to use inorganic fibers together for the purpose of preventing the refractory coating material from falling and peeling because the refractory coating material expands due to heating during fireproofing. The inorganic lightweight aggregate is used for the purpose of reducing the weight and reducing the thermal conductivity of the fireproof coating material of the present invention. The mixing ratio is 5 to 500 with respect to 100 parts by weight of hydraulic cement.
Part by weight, but preferably 30 to 120 parts by weight. If the compounding ratio of the inorganic lightweight aggregate is less than the lower limit value, the weight reduction of the fire resistant coating material and reduction of thermal conductivity cannot be expected, and if it is more than the upper limit value, the mechanical strength of the fire resistant coating material deteriorates. It will be. Specific examples of the inorganic fibers include alkali resistant glass fibers and ceramic fibers. The inorganic fiber is used for the purpose of preventing the fireproof coating material of the present invention from falling off and peeling off during fireproofing. When inorganic fibers are added, the compounding ratio is 1 to 50 parts by weight, preferably 2 to 10 parts by weight, based on 100 parts by weight of hydraulic cement. If the blending ratio is less than the lower limit, it is not possible to prevent the refractory coating from falling off or peeling off during fire, and if it is more than the upper limit, the effect of preventing further dropping off or peeling cannot be obtained.

Further, as the re-emulsified synthetic resin powder, a preferred specific example is vinyl acetate copolymer-based re-emulsified synthetic resin powder. The re-emulsified synthetic resin powder can be expected to improve the adhesive strength of the refractory coating to the steel frame at room temperature and the surface strength of the refractory coating. When the re-emulsified synthetic resin powder is added, the compounding ratio thereof is 1 to 300 parts by weight, preferably 5 to 50 parts by weight, based on 100 parts by weight of hydraulic cement. If the blending ratio of the re-emulsified synthetic resin powder is less than the lower limit value, the improvement of the adhesive strength of the fire resistant coating material to the steel frame cannot be expected, and even if it is added above the upper limit value, there is no further effect, rather the fire resistant coating material Detract from the fire resistance of.

In the present invention, in addition to the above-mentioned components, calcium carbonate, silica sand powder, and viscous mineral may be added, respectively, if necessary.
It may be added in the range of 0 to 300 parts by weight.

[0013]

The fireproofing principle of the fireproof coating material of the present invention is that the hydroxide compound decomposes and undergoes an endothermic reaction at the time of heating. This endothermic action and heat conduction due to the formation of a nonflammable gas layer by the steam gas generated by this It is thought to consist of a delay effect.

In the present invention, it should be noted that water glass is added in an appropriate amount, that is, 40 to 100 parts by weight of hydraulic cement.
By blending a specific amount of 300 parts by weight, a non-combustible gas called water vapor gas, which could not be obtained when the blending amount of water glass was out of this range, was used for long-term fireproofing with a dense glass film made of water glass. It is possible to keep them between the covering materials, so that the effect of delaying heat conduction can be further enhanced. Furthermore, 6
At temperatures above 50 ° C., water vapor changes from anhydrous sodium silicate to a hydrate having a viscosity of sodium hydrosilicate, which further delays the escape of water vapor from the refractory coating material. It is considered that the fire resistance performance is improved.

[0015]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples. In Examples and Comparative Examples, white cement is used as the hydraulic cement, sodium metasilicate type 1 is used as the water glass, aluminum hydroxide is used as the hydroxide compound, obsidian perlite is used as the inorganic lightweight aggregate, and inorganic fiber is used as the inorganic fiber. As the alkali resistant glass fiber and the re-emulsified synthetic resin powder, a vinyl acetate copolymer-based re-emulsified synthetic resin powder was used. The mixing ratio of these materials was changed for each of the Examples and each of the Comparative Examples, and the mixture obtained by hydro-kneading these materials was applied to an iron plate of 100 × 100 × 1.5 mm assuming a steel frame to have a thickness of 15 mm. Was exposed to a furnace heated to 1000 ° C., and the time until the average temperature of the internal steel frame reached 350 ° C. was determined.

Examples 1 to 7 As shown in Table 1, the mixing ratio of water glass was changed from the lower limit to the upper limit of the range specified in the present invention (Examples 1 to 1).
4), and the addition amount of components other than the essential components of the present invention was changed (Examples 5 to 7). In all of Examples 1 to 7, the 15 mm thick fire resistance time was over 60 minutes, which was required to achieve the conventional 60 minutes fire resistance time.
It can be seen that sufficient fire resistance can be obtained with a thickness far below 0 mm.

[0017]

[Table 1] Comparative Examples 1-2 As shown in Table 2, Comparative Example 1 is an example in which only the hydroxide compound is added at the same blending ratio as in Example 1. In this case, the fire resistance was remarkably deteriorated, and the 15 mm thick fire resistance time was 31 minutes. From this it can be seen that the fireproof principle of the fireproof coating according to the invention does not hold if the hydroxide compound is lacking. Further, Comparative Example 2 is an example in which the mixing ratio is the same as that of Example 1 and only water glass is not added this time. Since the hydroxide compound was added in the same amount as in Example 1, the decomposition endothermic action and the generation of water vapor gas are presumed to occur to the same extent, but the 15 mm thick fire resistance time was 45 minutes. From this, it is understood that the high fire resistance performance of the fire resistant coating material according to the present invention is obtained by the synergistic effect of the hydroxide compound and water glass.

[0018]

[Table 2] Further, the fire-resistant coating materials obtained from the above-mentioned examples were close to mortar concrete in terms of surface strength, and there was absolutely no risk of scattering, peeling or dropping after the construction. In addition, a white fireproof coating material having excellent durability and weather resistance was obtained, and it was suitable for makeup work such as coloring.

[0019]

EFFECTS OF THE INVENTION A remarkable point of the present invention is that a water vapor gas generated by a dehydration reaction of a hydroxide compound during heating is generated between a fireproof coating material for a long time by a dense glass film made of water glass added in an appropriate amount. Therefore, the effect of delaying heat conduction is further enhanced, and higher fire resistance performance is realized.

Therefore, it becomes possible to reduce the construction thickness of the fire-resistant coating material, and the spraying work, which conventionally required to be sprayed twice, can be completed once, shortening the construction period, improving the work efficiency, and the working process. It is possible to simplify the work and reduce the work labor.

When water glass, re-emulsified synthetic resin powder or hydraulic cement is added, the surface strength of the cement is similar to that of mortar concrete, so there is no risk of scattering, peeling or dropping after the construction. At all, there is no need to reinforce the surface strength with a cement filler or the like in the finishing work in the pillar portion. For this reason, the plastering work process such as the cement filler can be omitted, so that the work period can be further shortened, the work efficiency can be improved, the work process can be simplified, and the work labor can be reduced. Also, in terms of makeup, durability,
Since it is a white fireproof coating material with excellent weather resistance, it is also suitable for makeup work such as coloring.

Claims (4)

[Claims] 1. To 100 parts by weight of hydraulic cement,
Water glass 40 to 300 parts by weight, hydroxide compound 20 to 80
A refractory coating material comprising 0 parts by weight of a blended composition. 2. An inorganic lightweight aggregate is used as a hydraulic cement 10.
The fire-resistant coating material according to claim 1, wherein the content is 5 to 500 parts by weight with respect to 0 parts by weight. 3. The fire resistant coating material according to claim 1, wherein the inorganic fiber is contained in an amount of 1 to 50 parts by weight with respect to 100 parts by weight of the hydraulic cement. 4. The fire resistant coating material according to claim 1, wherein the re-emulsified synthetic resin powder is contained in an amount of 1 to 300 parts by weight based on 100 parts by weight of the hydraulic cement.