JP6936912B1 - Manufacturing method of refractory coating material and refractory coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refractory coating material and a method for producing a refractory coating material, which can secure fire resistance without impairing the appearance of a joint portion of a steel frame structure and can be installed safely, quickly and easily. The purpose is to do. SOLUTION: A nut cap 1 is made of a foamable fire-resistant paint containing ammonium polyphosphate, and has an internal space 2 formed in which an internal space 2 capable of accommodating a nut 22 fastened to a bolt 20 for joining steel frame materials is formed. Has 3. In the nut cap 1, it is desirable that the covering portion 3 has a thickness capable of ensuring the fire resistance of the steel frame material. In the nut cap 1, when the covering portion 3 accommodates the nut 22, the covering portion 3 may be formed so that the inner surface of the covering portion 3 and the tip of the bolt 20 are separated from each other. [Selection diagram] Fig. 1

Description

The present invention relates to a refractory coating material and a method for producing a refractory coating material.

Conventionally, in order to maintain the fire resistance performance of the steel frame portion of a building, a foamable fire resistant paint is applied to the steel frame material. The foamable refractory paint is a thin film (for example, about several mm) at the time of application, and foams due to a temperature rise such as a fire to form a heat insulating layer of several tens of mm.

The effervescent refractory paint can be finished with a relatively small thickness on the steel frame surface like a normal paint. Therefore, unlike the case where a fireproof coating material such as a scroll is wrapped around a steel frame, the fireproof performance can be ensured without impairing the design in which the steel frame shape of the building is exposed to the exterior or interior.

The following Patent Document 1 discloses an invention relating to a foamable refractory paint. The foamable refractory paint is not limited to the one disclosed in Patent Document 1, and various kinds are known.

Japanese Unexamined Patent Publication No. 2004-315812

One-component foamable refractory paint requires several weeks as a building painting process due to drying and recoating of thin films.

In addition, there are two-component mixed curing type effervescent refractory paints, and the two-component mixed and cured effervescent refractory paint has high quick-drying property and dries to the touch in about 1 hour, and is 4 mm in one application. It is possible to apply a thick coat. The two-component mixed curing type foamable fireproof paint is usually applied by an airless spray gun or a brush at a construction site of a building. However, since the two-component mixed curing type foamable refractory paint has a high viscosity of about 5 Pas to several Pas (about 20 ° C.), the coating work is more difficult than the one-component foamable refractory paint.

In the coating process of the foamable refractory paint, it is necessary to ensure the predetermined fire resistance by performing the refractory paint having a specified film thickness on all the coated surfaces. Further, in the application work of the foamable refractory paint, particularly in the place where a plurality of high-strength bolts are installed at the joint portion between the steel frame materials in the steel frame structure, uniform application can be performed while ensuring fire resistance. It takes time and effort, and it is difficult to get a good finish. This problem occurs in any case of the one-component foamable refractory paint and the two-component mixture curing type foamable refractory paint.

The present invention has been made in view of such circumstances, and it is possible to secure fire resistance at a joint portion of a steel frame structure without impairing the appearance, and to construct the joint portion safely, quickly and easily. It is an object of the present invention to provide a refractory coating material capable of producing a refractory coating material and a method for producing the refractory coating material.

In order to solve the above problems, the following means are adopted as the refractory coating material and the method for producing the refractory coating material of the present invention.
That is, the fireproof coating material according to the present invention is made of a foamable fireproof paint containing a main material containing ammonium polyphosphate as a main component, a curing agent containing urethane resin as a main component, and a plasticizer, and is made of a steel frame. An internal space that can accommodate a nut fastened to a bolt that joins the materials is formed , and the shape is along the outer peripheral surface of the nut and the tip of the bolt, so that the fire resistance performance of the steel frame material can be ensured. It has a coating portion having a large thickness, and the foamable fire-resistant paint is cured and has elasticity.
The fire-resistant coating material according to the above invention may further have a flange provided at the end of the coating portion, and the thickness of the flange can ensure the fire-resistant performance of the steel frame material after curing and drying. It is the same as the film thickness of the foamable refractory paint before drying.

In the fire-resistant coating material according to the above invention, it is desirable that the covering portion has a thickness capable of ensuring the fire-resistant performance of the steel frame material.

In the refractory coating material according to the present invention, when the coating portion accommodates the nut, the coating portion may be formed so that the inner surface of the coating portion and the tip of the bolt are separated from each other.

In the refractory coating material according to the above invention, the foamable refractory paint may be a two-component mixture curing type paint.

In the method for producing a fireproof coating material according to the present invention, a first molding die capable of forming the outer peripheral surface shape of the coating portion and an internal space of the coating portion capable of accommodating a nut fastened to a bolt for joining steel aggregates to each other. The coating portion to be formed has a shape along the outer peripheral surface of the tip of the nut and the bolt, and it is possible to secure the fire resistance performance of the steel aggregate. Between the step of preparing a molding die having a thickness and the first molding die and the second molding die, a main material containing ammonium polyphosphate as a main component, a curing agent containing a urethane resin as a main component, and a curing agent. A step of injecting a foamable fireproof coating material containing a plasticizer, and a step of curing the foamable fireproof coating material injected between the first molding mold and the second molding mold so as to have elasticity. Has.

According to the present invention, fire resistance can be ensured at the joint portion of the steel frame structure without impairing the appearance, and the construction can be carried out safely, quickly and easily.

It is a vertical sectional view which shows the nut cap which concerns on one Embodiment of this invention. It is a cross-sectional view cut along line II-II of FIG. It is a vertical sectional view which shows the molding die for manufacturing the nut cap which concerns on one Embodiment of this invention. It is a top view which shows the 2nd molding mold for manufacturing the nut cap which concerns on one Embodiment of this invention.

Hereinafter, the nut cap 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2.
The nut cap 1 according to an embodiment of the present invention is a member capable of accommodating a nut fastened to a bolt 20.

The steel frame material 10 is a steel material generally used for a steel frame structure, such as H-shaped steel. The bolts 20 and nuts 22 join the steel frame members 10 used for the steel frame structure of a building to each other. The bolt 20 is, for example, a high-strength bolt used for a joint portion of a steel frame structure, and the nut 22 is fastened to the bolt 20 when the steel frame members 10 are joined to each other.

The size of the bolt 20 and the nut 22 may be a size capable of imparting a predetermined joint strength, and may be a size generally used for a joint portion of a steel frame structure.

The nut cap 1 is an example of a fireproof coating material. As shown in FIGS. 1 and 2, the nut cap 1 includes a covering portion 3 capable of covering one nut 22, and one nut cap 1 is formed for one nut 22. That is, one nut cap 1 is installed for each of the plurality of nuts 22 at the connecting portion of the steel frame structure.

The covering portion 3 has an internal space 2 capable of accommodating the nut 22. The covering portion 3 has a shape along the outer peripheral surface of the nut 22, the washer 24, and the tip 20a of the bolt 20.

The covering portion 3 may be formed so that the inner surface of the covering portion 3 and the tip end 20a of the bolt 20 are separated from each other when the covering portion 3 accommodates the nut 22. When the covering portion 3 is installed on the nut 22, an appropriate amount of a refractory paint or an adhesive (for example, an epoxy resin type) before curing is injected into the coating portion 3. As a result, the fireproof paint or adhesive is filled between the nut cap 1 and the nut 22, and the fireproof paint or adhesive joins the nut cap 1 and the nut 22.

The thickness of the covering portion 3 is a thickness capable of ensuring the fire resistance of the steel frame material 10. The thickness of the covering portion 3 is, for example, 1.75 mm or more. The thickness of the covering portion 3 is determined by the fire resistance required for the applied steel material. That is, it has the same thickness as the specified film thickness of the DRY film thickness, which is the film thickness after curing and drying of the refractory paint 12 applied to the portion other than the nut 22. As a result, the fire resistance around the nut 22 is ensured only by installing the nut cap 1 on the nut 22 at the joint portion between the steel frame members 10.

Further, a flange 3A may be provided at the end of the covering portion 3. It is desirable that the thickness of the flange 3A is the same as the film thickness of the refractory paint 12 before drying in order to ensure the fire resistance performance. The thickness of the refractory paint 12 is reduced to, for example, about 85% by drying after application. The WET film thickness, which is the film thickness immediately after coating the fire-resistant paint 12, is determined so that the DRY film thickness, which is the film thickness after curing and drying of the fire-resistant paint 12, is the specified film thickness. The thickness of the flange 3A is the same as the WET film thickness determined so that the DRY film thickness of the refractory paint 12 becomes the specified film thickness. As a result, when the refractory paint 12 is applied to the flat portion, it can be applied based on the thickness of the flange 3A, and it becomes easy to confirm the required film thickness that must be secured.

The material of the covering portion 3 is, for example, a foamable refractory paint containing ammonium polyphosphate. According to the effervescent fire-resistant paint, when the temperature rises due to a flame such as a fire, a carbonized layer is formed while decomposition of ammonium polyphosphate, and a foamed carbonized layer is formed by the generated gas such as carbon dioxide and ammonia. Is formed. That is, the covering portion 3 of several mm is foamed by a fire, and a carbonized layer having a heat insulating property of 10 and several mm is formed. As a result, the fire resistance of the steel frame portion (for example, the fire resistance of 1 hour or 2 hours) is ensured.

The refractory paint, which is the material of the covering portion 3 of the present embodiment, has, for example, urethane resin. The refractory paint also contains a plasticizer and has elasticity even when cured. Since the nut cap 1 has elasticity, it becomes easy to attach the nut cap 1 to the nut 22, and workability is improved.

The refractory paint is, for example, a two-component mixed curing type paint. The two-component mixed curing type paint has high quick-drying property and can be touch-dried in about 1 hour, and can be applied thickly by about 4 mm with one application. The two liquids before mixing are the main material and the curing agent. The main component of the main material is ammonium polyphosphate, and the main material also contains titanium dioxide, a plasticizer, clay, castor oil, additives and the like. The main component of the curing agent is a urethane-based composite polymer, and the curing agent also contains aminosilane. The viscosity (20 ° C.) is, for example, 14 Pas for the main material, 1 Pas for the curing agent, and 8 Pas for mixing. An example of a refractory paint is Nullifier Hybrid Base Coat SC902 (trade name), but the present invention is not limited to this example.

Next, a method of manufacturing the nut cap 1 will be described.
The nut cap 1 is manufactured by curing the paint injected into the molding die 30.

As shown in FIG. 3, the molding die 30 has an inside capable of accommodating a first molding die 31 capable of forming the outer peripheral surface shape of the covering portion 3 and a nut 22 fastened to a bolt 20 for joining the steel frame members 10 to each other. It has a second molding die 32 capable of forming the space 2.

The first molding mold 31 is a cavity (female mold) made of synthetic resin, having a plate shape, and having a concave hole formed in a flat surface portion. It is desirable that the first molding die 31 be formed with a plurality of concave holes so that a plurality of nut caps 1 can be formed at one time.

The first molding die 31 may be formed from a plurality of plates so that nut caps 1 of various sizes can be formed according to the size of the nut 22, and may be used by being overlapped with each other. For example, the first plate 33 has a plate thickness corresponding to the length of the nut 22 and the washer 24, and a through hole 33A corresponding to the outer peripheral shape of the nut 22 and the washer 24 is formed. The second plate 34 has a plate thickness corresponding to the length of the tip 20a of the bolt 20, and a through hole 34A corresponding to the thickness of the tip 20a of the bolt 20 is formed. A hole 35A having a bottom corresponding to the shape of the tip 20a of the bolt 20 is formed in the third plate 35. For example, a first plate 33 having a different thickness and a diameter of the through hole 33A is selected according to the length and outer peripheral shape of the nut 22 and the washer 24, and the thickness corresponds to the length and thickness of the tip 20a of the bolt 20. A second plate 34 having a different diameter of the sheath through hole 34A is selected.

As shown in FIGS. 3 and 4, the second molding mold 32 is a core (male mold) made of a synthetic resin such as fluororesin and having a shape corresponding to the internal space 2 of the covering portion 3. The core of the second molding mold 32 has a nut portion 36, a washer portion 37, and a bolt portion 38. The nut portion 36, the washer portion 37, and the bolt portion 38 have a shape corresponding to the tip 20a of the nut 22, the washer 24, and the bolt 20 applied to the joint portion of the steel frame structure. The nut portion 36, the washer portion 37, and the bolt portion 38 may be a combination of different members or may be integrally formed. The second molding mold 32 further includes a plate material 39, and the plate material 39 has a shape corresponding to the internal space 2 of the covering portion 3 and has the above-mentioned core (nut portion 36, washer portion 37, bolt portion 38). ) Is fixed.

Then, after preparing a mold having the first mold 31 and the second mold 32, the foamable fireproof paint containing the above-mentioned ammonium polyphosphate is injected into the first mold 31. Then, the second molding die 32 made of the plate material 39 to which the core is fixed is installed in the first molding die 31. As a result, the refractory paint is injected and filled between the first molding mold 31 and the second molding mold 32.

After a lapse of a predetermined time, when the fire-resistant paint injected into the mold is cured, the second mold 32 is removed from the first mold 31 and the nut cap 1 formed by the curing of the fire-resistant paint is released. do. From the above, the nut cap 1 is manufactured.

When a two-component mixed curable paint is used as the fire-resistant paint, the two liquids are mixed before the fire-resistant paint is injected into the mold, and the mixed two liquids are injected into the mold before being cured. In addition, in order to shorten the time until the nut cap 1 is formed in the molding die, the refractory paint which is semi-solidified by mixing the two liquids may be injected into the molding die. Further, since the two-component mixed curing type paint is cured by two-component mixing, it can be cured even in a closed container to form the nut cap 1.

Next, a method of installing the nut cap 1 at the joint portion of the steel frame structure will be described.
After the bolt 20 is connected to the through hole of the joint portion of the steel frame structure and the nut 22 is fastened to the bolt 20, a predetermined torque is applied to the bolt 20 to ensure the required performance as a high-strength bolt. Then, in the process of applying the refractory paint, the undercoat paint is applied.

After that, the nut caps 1 according to the present embodiment are installed one by one with respect to the nuts 22 at the joint portion. When the inner surface of the covering portion 3 and the tip 20a of the bolt 20 are formed so as to be separated from each other in the covering portion 3, before the covering portion 3 is installed on the nut 22, the inside of the covering portion 3 is not cured. A proper amount of fireproof paint or adhesive is injected. Further, the refractory paint 12 is applied to the flat portion between the nut caps 1 by an airless spray gun or a brush. When a two-component mixed-curable paint is used, the two-component mixed-curable paint has high quick-drying property and can be touch-dried in about 1 hour, and can be applied thickly by about 4 mm with one application.

After the refractory paint has hardened, the topcoat paint is applied to complete the coating process.

In the coating process of the foamable refractory paint, it is necessary to ensure the predetermined fire resistance by performing the refractory paint having a specified film thickness on all the coated surfaces. The one-component foamable refractory paint requires several weeks as a building painting process due to drying and recoating of thin films. Further, although the two-component mixed type refractory paint has a quick-drying property, the viscosity is as high as about 5 Pas to 10 and several Pas (about 20 ° C.), so that the coating work is difficult at the construction site of the building. In both cases of one-component foamable fireproof paint and two-component mixed curing type foamable fireproof paint, fire resistance is ensured where multiple high-strength bolts are installed at the joints between steel frames in the steel structure. However, it takes time and effort to apply evenly, and it is difficult to obtain a good finish.

On the other hand, according to the present embodiment, the nut cap 1 is formed of a foamable refractory paint having a thickness that ensures a predetermined fire resistance, and has the shape of a nut 22 fastened to the bolt 20. Then, the nut 22 can be covered. Therefore, instead of applying the fire-resistant paint along the bolt 20 with an airless spray gun or a brush, the worker simply installs the nut cap 1 on the nut 22 to obtain the same fire-resistant performance as the fire-resistant paint. Can be secured.

Therefore, in the joint portion of the steel frame structure, fire resistance can be ensured without impairing the appearance, and the construction can be carried out safely, quickly and easily. In particular, shortening the construction period of the coating work at the construction site will greatly contribute to cost reduction and safety assurance, especially at the site where the work can be done only at night. Further, in the application by an airless spray gun or a brush along the shape of the nut 22, the film thickness varies and a large amount of paint is required, it takes time to confirm the required film thickness, and a good finish is obtained. It was difficult. On the other hand, according to the present embodiment, the amount of paint can be reduced and the required film thickness can be surely secured. Also, the finish of the painted surface will be improved.

The fireproof coating material according to the present invention is not limited to the above-mentioned example. For example, when the distance between the plurality of nuts 22 at the connecting portion of the steel frame structure is known in advance, the fireproof coating material may have a plurality of covering portions 3 in which a plurality of covering portions 3 accommodating one nut 22 are connected. .. The connecting portion that connects the plurality of covering portions 3 is also formed of the same material as the covering portion 3. As a result, instead of installing the nut caps 1 for each of the plurality of nuts 22, a plurality of nuts can be installed by installing one fireproof coating material while installing the covering portion 3 in accordance with the nuts 22. 22 can be covered. As a result, the work of applying the refractory paint between the nuts 22 can be omitted.

1: Nut cap 2: Internal space 3: Covering part 3A: Flange 10: Steel aggregate 12: Fireproof paint 20: Bolt 20a: Tip 22: Nut 24: Washer 30: Molding mold 31: First molding mold 32: Second molding Mold 33: First plate 33A: Through hole 34: Second plate 34A: Through hole 35: Third plate 35A: Hole 36: Nut part 37: Washer part 38: Bolt part 39: Plate material

Claims (5)

A nut that is made of a foamable fire-resistant paint containing a main material containing ammonium polyphosphate as a main component, a curing agent containing a urethane resin as a main component, and a plasticizer, and is fastened to a bolt that joins steel aggregates to each other. An internal space is formed, which has a shape along the outer peripheral surface of the tip of the nut and the bolt, and has a coating portion having a thickness capable of ensuring the fire resistance performance of the steel aggregate. A fireproof coating material obtained by curing the foamable fireproof paint and having elasticity. Further having a flange provided at the end of the covering
The fire-resistant coating material according to claim 1, wherein the thickness of the flange is the same as the film thickness of the foamable fire-resistant paint before drying, which enables the fire-resistant performance of the steel frame material to be ensured after curing and drying. .. The fireproof coating material according to claim 1 or 2, wherein the coating portion is formed so that the inner surface of the coating portion and the tip of the bolt are separated from each other when the coating portion accommodates the nut. The fireproof coating material according to any one of claims 1 to 3, wherein the foamable fireproof paint is a two-component mixed curing type paint. It has a first molding mold capable of forming the outer peripheral surface shape of the covering portion and a second molding mold capable of forming an internal space of the covering portion capable of accommodating a nut fastened to a bolt for joining steel frames to each other. A step of preparing a molding mold having a shape in which the covering portion to be formed is formed along the outer peripheral surface of the tip of the nut and the bolt and having a thickness capable of ensuring the fire resistance performance of the steel frame material.
A foamable fire-resistant paint containing a main material containing ammonium polyphosphate as a main component, a curing agent containing urethane resin as a main component, and a plasticizer between the first molding die and the second molding die. Steps to inject and
A step of curing the foamable refractory paint injected between the first mold and the second mold so as to have elasticity.
A method for manufacturing a refractory coating material having.

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