JP2022132713A - Coating structure and film thickness measurement method - Google Patents

Abstract

To provide a coating structure capable of stably obtaining an objective heat-resistant stability performance.SOLUTION: In a coating structure in which a thermally foaming coating material layer is laminated on a substrate, the substrate is a non-metallic material, an auxiliary member is fixed to the substrate, the auxiliary member has a metallic material at least on an upper surface thereof, and the thermally foaming coating material layer is laminated so as to cover the auxiliary member on the substrate.SELECTED DRAWING: Figure 1

Description

The present invention relates to a novel coating structure and film thickness measurement method.

BACKGROUND ART For the purpose of protecting foundations such as steel frame materials and steel materials constituting buildings from fire, various thermally foaming coating materials have been proposed that foam when the temperature rises in the event of a fire and form a carbonized heat insulating layer. As such a thermally foamable coating material, there is known a synthetic resin compounded with a foaming agent, a carbonizing agent, a flame retardant, and the like. The heat-resistant protective performance of thermally foamable coating materials is often determined by the thickness of the coating, and in order to obtain the desired heat-resistant protective performance, it is necessary to form a uniform coating with a predetermined coating thickness on the underlying surface. is important. In general, the film thickness of a thermally foamable coating material layer formed on a base surface such as a steel frame material or steel material is measured using an electromagnetic or eddy current film thickness meter (for example, Patent Document 1, Patent document 2).

On the other hand, in recent years, for the purpose of further heat-resistant protective performance of buildings, in addition to steel frame materials and steel materials, for example, various substrates such as concrete, mortar, wood, synthetic resin, and fibrous materials. Formation of foam dressing layers has been considered.

Japanese Patent Application Laid-Open No. 2003-088799 JP 2018-159065 A

However, depending on the type of substrate, there are cases where the film thickness cannot be measured or the film thickness cannot be measured accurately. SUMMARY OF THE INVENTION It is an object of the present invention to provide a covering structure capable of measuring the film thickness of a thermally foamable covering material regardless of the type of substrate.

In order to solve such problems, the present inventors have found that in a structure in which a thermally foamable coating material layer is laminated on a substrate, by fixing a specific auxiliary member to the substrate surface, The present inventors have found that the film thickness of a thermally foamable coating material can be measured without using a thermally foamable coating material, and have completed the present invention.

That is, the present invention has the following features.
1. A covering structure in which a thermally foamable covering material layer is laminated on a base,
The base is a non-metallic material,
An auxiliary member is fixed to the surface of the base,
The auxiliary member has a metal material at least on its upper surface,
A covering structure, wherein a thermal foamable covering material layer is laminated so as to cover the auxiliary member on the base.
2. 1. The head has an area of 1 cm ² or more and a thickness of 0.1 μm or more and 5 mm or less. The covering structure according to .
3. 1 above. or 2. A method for measuring the film thickness of the thermally foamable covering material layer in the covering structure according to
A film thickness measuring method, wherein the distance from the surface of the thermally foamable covering material layer to the head of the auxiliary member is measured by an electromagnetic or eddy current film thickness meter.
5. A method for forming a covering structure in which a thermally foamable covering material layer is laminated on a base,
After fixing the auxiliary member to the surface of the base, a step of applying a thermally foamable coating material,
The base is a non-metallic material,
The auxiliary member has a metal material at least on its upper surface,
A method for forming a covering structure, characterized in that a thermally foamable covering material is applied onto the underlayer so as to cover the auxiliary member.

The structure of the present invention can stably measure the film thickness of the thermally foamable covering material regardless of the type of substrate. As a result, the desired heat resistance protection performance can be stably obtained when the temperature rises due to a fire or the like.

1 shows an example of the covering structure of the present invention. 1 shows an example of the covering structure of the present invention. An example (enlarged view) of the covering structure of the present invention is shown. 1 shows an example of the covering structure of the present invention. An example (enlarged view) of the covering structure of the present invention is shown. An example of the film thickness measuring method of the present invention is shown. 1 shows an example of the covering structure of the present invention.

1. groundwork 2. Thermal foam dressing layer3. Auxiliary member 31 . adhesive 32 . stop 4. Substrate 41 . H-shaped steel frame5. film thickness gauge

Hereinafter, the present invention will be described in detail based on its embodiments.

<Coating structure>
FIG. 1(I) is a cross-sectional view showing an example of the covering structure of the present invention. In FIG. 1(I), a heat-foamable covering material layer 2 is laminated on a substrate 1 . Further, an auxiliary member 3 is fixed to the surface of the substrate 1, and a thermal foamable covering material layer 2 is laminated so as to cover the auxiliary member 3. As shown in FIG.

FIG. 1(II) is a cross-sectional view showing another example of the covering structure of the present invention. As shown in FIG. 1(II), the underlayer 1 may be a layered base material 4 such as a steel frame material or steel material constituting a building. Specifically, in FIG. 2, a base 1 is coated on an H-shaped steel frame 41, an auxiliary member 3 is fixed to the base 1, and a thermal foaming coating material is applied so as to cover the auxiliary member 3. Layer 2 is laminated.

(groundwork)
The underlayer 1 of the present invention is characterized by being made of a non-metallic material. Examples of nonmetallic materials include wood materials; inorganic materials such as lightweight mortar, lightweight concrete, calcium silicate board, ALC board, siding board, gypsum board, slate board, concrete, and mortar; glass wool, rock wool, and cellulose fiber. , insulation boards and other fiber-based heat-insulating materials, and foamed plastic-based heat-insulating materials such as polyethylene foam, polystyrene foam, and polyurethane foam. In particular, the present invention can stably measure the thickness of the thermally foamed covering material layer 2 formed on the surface of a flexible material such as a fiber-based heat insulating material or a foamed plastic-based heat insulating material. Therefore, the desired heat resistance protection performance can be stably obtained.

Although the thickness of the underlayer 1 is not particularly limited, it is preferably 5 to 500 mm (more preferably 10 to 300 mm). In the present invention, even if the substrate 1 has a thickness, the thickness of the thermally foamed covering material layer formed on the surface thereof can be stably measured, so that the desired heat resistance protection performance can be stably obtained. be able to. In the present invention, "α to β" has the same meaning as "more than or equal to α and less than or equal to β".

(Thermal Foaming Covering Material Layer)
In the thermally foamable coating material layer 2 of the present invention, the surrounding temperature rises due to a fire or the like, and the coating temperature reaches a predetermined foaming temperature (preferably 150° C. or higher, more preferably 180° C. or higher, further preferably 200 to 400° C.). It is formed of a thermally foamable coating material that foams when the temperature reaches 100°C and forms a carbonized heat insulating layer in that temperature range. As such a thermally foamable coating material, one containing a resin component, a flame retardant, a foaming agent, a carbonizing agent, and a filler as constituent components is suitable.

Examples of the resin component include water-dispersible type, water-soluble type, NAD type, solvent-soluble type, solvent-free type, and the like, and one-liquid type, two-liquid type, etc. are not particularly limited and can be used. Specifically, vinyl acetate resin, vinyl acetate/vinyl versatate copolymer resin, vinyl acetate/ethylene copolymer resin, vinyl acetate/vinyl versatate/acrylic copolymer resin, vinyl acetate/acrylic copolymer resin, acrylic Organic synthetic resins such as resins, acrylic/styrene resin copolymer resins, epoxy resins, urethane resins, polyester resins, polybutadiene resins, alkyd resins, and vinyl chloride resins can be used. These can also be used individually or in combination of 2 or more types.

The flame retardant of the present invention generally exerts at least one effect such as a dehydration cooling effect, a nonflammable gas generation effect, a carbonization promotion effect, etc. in the event of a fire, and has an action of suppressing combustion of the resin component. The flame retardant used in the present invention is not particularly limited as long as it has such action, and known flame retardants can be used. For example, tricresyl phosphate, diphenyl cresyl phosphate, diphenyloctyl phosphate, tri(β-chloroethyl) phosphate, tributyl phosphate, tri(dichloropropyl) phosphate, triphenyl phosphate, tri(dibromopropyl) phosphate Organophosphorus compounds such as phate, chlorophosphonate, bromophosphonate, diethyl-N,N-bis(2-hydroxyethyl)aminomethylphosphate, di(polyoxyethylene)hydroxymethylphosphonate; chlorination Chlorine compounds such as polyphenyl, chlorinated polyethylene, diphenyl chloride, triphenyl chloride, pentachlorinated fatty acid ester, perchloropentacyclodecane, chlorinated naphthalene, tetrachlorophthalic anhydride; antimony compounds such as antimony trioxide and antimony pentachloride; phosphorus compounds such as phosphorus trichloride, phosphorus pentachloride, ammonium phosphate and ammonium polyphosphate; and other boron compounds such as zinc borate and sodium borate. These can be used singly or in combination of two or more. Moreover, although an uncoated product can be used, a coated product or the like can also be used.

The mixing ratio of the flame retardant is preferably 50 to 1000 parts by weight, more preferably 100 to 800 parts by weight, and more preferably 200 to 600 parts by weight with respect to 100 parts by weight (solid content) of the resin component. In the present invention, by including the flame retardant in such a relatively high proportion, good performance in terms of heat protection can be obtained.

The foaming agent of the present invention generally has the effect of generating a nonflammable gas in the event of a fire, foaming the carbonizing resin component and the carbonizing agent, and forming a carbonized heat insulating layer having pores. The foaming agent is not particularly limited as long as it has such action, and known foaming agents can be used. Examples thereof include melamine and its derivatives, dicyandiamide and its derivatives, azodicarbonamide, urea and thiourea. These can be used singly or in combination of two or more. The mixing ratio of the foaming agent is preferably 5 to 500 parts by weight, more preferably 30 to 200 parts by weight, per 100 parts by weight (solid content) of the resin component. Within such a range, excellent foamability can be exhibited, and good performance in heat protection can be obtained.

The carbonizing agent of the present invention generally has the effect of forming a thick carbonized heat-insulating layer with excellent heat-insulating properties by dehydrating and carbonizing itself along with the carbonization of the resin component in the event of a fire. The carbonizing agent used in the present invention is not particularly limited as long as it has such effects, and known carbonizing agents can be used. Examples thereof include polyhydric alcohols such as pentaerythritol, dipentaerythritol and trimethylolpropane; starch, casein and the like. These can be used singly or in combination of two or more. The mixing ratio of the carbonizing agent is preferably 5 to 600 parts by weight, more preferably 10 to 400 parts by weight, per 100 parts by weight (solid content) of the resin component. Within such a range, a dehydration cooling effect and a carbonization heat insulating layer forming action can be exhibited, and good performance in terms of heat protection can be obtained.

The filler of the present invention generally has the effect of maintaining the strength of the carbonized heat insulating layer. In the present invention, examples of fillers include titanium dioxide, calcium carbonate, inorganic fibers, and the like. These can be used singly or in combination of two or more. The mixing ratio of the filler is preferably 5 to 600 parts by weight, more preferably 10 to 400 parts by weight, per 100 parts by weight (solid content) of the resin component.

In addition to the components described above, the thermally foamable coating material of the present invention may contain various additives. Examples of such components include pigments, fibers, thickeners, film-forming aids, leveling agents, wetting agents, plasticizers, antifreeze agents, pH adjusters, preservatives, antifungal agents, anti-algae agents, antibacterial agents, agents, dispersants, antifoaming agents, adsorbents, cross-linking agents, ultraviolet absorbers, antioxidants, catalysts and the like. Expandable substances such as expandable graphite and unexpanded vermiculite can also be blended.

The thickness of the thermally foamable covering material layer 2 of the present invention is set according to the desired heat resistance protection performance, and is preferably about 0.2 to 10 mm, more preferably about 0.5 to 6 mm. By laminating such a thermally foamable covering material layer 2, it is possible to exhibit excellent heat resistance protection when exposed to high temperatures such as in the event of a fire.

(Auxiliary member)
The auxiliary member 3 of the present invention is fixed to the substrate 1 and is an auxiliary member for measuring the film thickness of the thermal foamable coating material layer 2 laminated on the substrate 1 .

The auxiliary member 3 is characterized by having a metal material at least on its upper surface (the surface opposite to the base surface). As such an auxiliary member 3, for example, a metal material or a material having a metal material laminated on the surface of at least one selected from resin, wood, fiber material, paper, and the like can be used. Examples of metal materials include magnetic metals and non-magnetic metals, such as iron, steel, stainless steel, aluminum, copper, and brass. These can be used singly or in combination of two or more. Moreover, the surfaces of these metal materials may be subjected to some surface treatment within a range that does not impair the effects of the present invention. By using such an auxiliary member 3, the film thickness of the thermally foamable coating material layer 2 laminated on the substrate 1 can be easily measured by an electromagnetic or eddy current film thickness meter.

The auxiliary member 3 preferably has an area of 1 cm ² or more (more preferably 1 cm ² or more and 25 cm ² or less, still more preferably 1 cm ² or more and 10 cm ² or less) and a thickness of preferably 0.1 μm or more and 5 mm or less (more preferably 0.5 μm or more and 3 mm or less). In such a case, the film thickness can be stably measured. Moreover, when the area and thickness satisfy the above ranges, it is possible to suppress the transfer of heat to the underlayer 1 and ensure sufficient heat resistance protection.

The upper surface of the auxiliary member 3 is preferably flat, and for example, a film-like, sheet-like, or plate-like one can be used. The planar shape is not particularly limited, but examples thereof include triangles, quadrilaterals (rectangles, trapezoids, rhombuses, etc.), polygons, circles, ellipses, etc., and the corners thereof are rounded. There may be.

A method for fixing the auxiliary member 3 of the present invention may be appropriately set depending on the substrate 1, and for example, an adhesive, a fastener, or the like can be used.
FIG. 3 is an enlarged view of the covering structure of the present invention, showing an example when the auxiliary member 3 is fixed with an adhesive 31. As shown in FIG. In the case of fixing with the adhesive 31, for example, the adhesive 31 may be applied to the lower surface (base surface side) of the base 1 and/or the auxiliary member 3, and the auxiliary member may be adhered to the base surface. Alternatively, one surface of the auxiliary member 3 in which an adhesive 31 is laminated in advance (for example, a metal tape) can be used.

FIGS. 4(I) and 4(II) are sectional views showing an example of the covering structure of the present invention. In FIG. 4 , the auxiliary member 3 is fixed to the substrate 1 using the fasteners 32 , and the thermally foamable covering material layer 2 is laminated so as to cover the auxiliary member 3 . Moreover, FIG. 5 is an enlarged view of the covering structure of the present invention, showing an example when the auxiliary member 3 is fixed by the fastener 32. As shown in FIG. For fixing with the fastener 32, for example, a method of fitting the fastener 32 into a hole provided in the auxiliary member 3 (FIG. 5(I)), or a method in which the auxiliary member 3 and the fastener 32 are joined in advance. 5 (II)). Moreover, two or more (plurality) of the stoppers 32 may be used (Fig. 5 (III)). Furthermore, in the present invention, the adhesive 31 and the fastener 32 can be used together.

The fastener 32 is not particularly limited as long as it can be fixed to the substrate 1, and a plurality of fasteners 32 can be provided. The stopper 32 is preferably fixed by piercing the base 1, and preferably has a sharp shape. Moreover, the stopper 32 may have a threaded portion. The length (H32) of the stopper 32 is preferably 5 to 100 mm (more preferably 8 to 50 mm), and the thickness of the stopper 32 is preferably 0.5 to 5 mm (more preferably 1 to 4 mm). is. In such a case, the auxiliary member 3 can be sufficiently fixed to the base 1 . In particular, the auxiliary member 3 can be stably fixed even if the substrate 1 is made of a flexible material or an existing material that has deteriorated over time. As a result, when the coating structure of the present invention is exposed to high temperatures such as in the event of a fire, the thermally foamable coating material layer can be stably foamed to form a carbonized heat insulating layer, and the formed It is possible to prevent the carbonized heat insulating layer from coming off from the base 1 .

Furthermore, the length (H32) of the stopper 32 is preferably shorter than the thickness of the base 1. Specifically, the length (H32) of the needle portion 32 is preferably shorter than the thickness (H1) of the base 1 by 5 mm or more (more preferably 8 mm or more). In such a case, heat is less likely to be conducted to the underlayer 1, and the desired heat resistance protection can be sufficiently obtained.

The material of the stopper 32 is not particularly limited, and examples thereof include metal materials, resins, and wood. In the present invention, nonflammable materials are preferred, and metal materials are particularly preferred.

The configuration of the covering structure of the present invention will be specifically described below.

(Method for Forming Coating Structure)
The coated structure of the present invention can be obtained by, for example, forming the thermally foamable coating material layer 2 by applying the thermally foamable coating material after fixing the auxiliary member 3 to the substrate 1 .

The auxiliary member 3 is preferably fixed along the surface of the base 1 using an adhesive 31 and/or a fastener 32 . As a result, it can be stably fixed to the substrate 1, and the thickness of the thermally foamable covering material layer can be stably measured. Moreover, it is preferable to use a plurality of auxiliary members 3 according to the shape and size of the substrate 1 . Thereby, a thermally foamable covering material layer having a uniform thickness can be formed.

The thermally foamable coating material layer 2 is formed by applying a thermally foamable coating material to the substrate 1 with the auxiliary member 3 fixed thereto. In the coating of the thermally foamable coating material, spray coating using a spray gun, airless spray gun, pumping machine or the like, trowel coating, brush coating, roller coating, or the like can be employed. At the time of coating, the viscosity can be appropriately adjusted with a diluting solvent.

The thickness of the heat-foamable coating material layer 2 can be appropriately set according to the heat-resistant protection performance, application site, etc., but it is usually about 0.1 to 20 mm, preferably about 0.3 to 10 mm. In the coating of the thermally foamable coating material, it is also possible to apply multiple coatings so that the coating film has a predetermined thickness.

In the covering structure of the present invention, due to the anchoring effect of the auxiliary member 3, when exposed to high temperatures such as in the event of a fire, the thermally foamable covering material layer 2 stably expands to form a carbonized heat insulating layer. In addition, it is possible to prevent the formed carbonized heat insulating layer from coming off from the substrate 1 . Further, the substrate 1 and the thermally foamable covering material layer 2 excluding the fixing portion of the auxiliary member 3 have excellent adhesion, and the desired heat resistance protection can be sufficiently obtained.

<Film thickness measurement method>
In the covering structure of the present invention, as shown in FIG. 6, the film thickness of the thermally foamable covering material layer 2 laminated on the substrate 1 can be measured using an electromagnetic or eddy current film thickness meter. . The auxiliary member 3 is fixed to the substrate 1, and the thermally foamable covering material layer 2 is laminated so as to cover the auxiliary member 3, so that the auxiliary member 3 can be seen from the surface of the thermally foamable covering material layer 2. By measuring the distance X to , the film thickness of the thermally foamable covering material layer 2 can be measured.

Examples are shown below to further clarify the features of the present invention.

(Thermal Foaming Covering Material)
After adding 250 parts by weight of an acrylic resin solution (solid content: 40% by weight) and 90 parts by weight of a diluting solvent, they were mixed and stirred with a dissolver. Next, 100 parts by weight of melamine, 100 parts by weight of dipentaerythritol, 400 parts by weight of ammonium polyphosphate, and 120 parts by weight of titanium oxide were added and stirred until uniform to prepare a thermally foamable coating material.

(Test example 1)
As shown in FIG. 2, an aluminum tape [1. 5 cm x 1.5 cm x thickness 80 µm (aluminum layer 50 µm, adhesive layer 30 µm)] was adhered and fixed. At this time, auxiliary members were fixed at intervals of 300 mm in the length direction of the H-shaped steel frame 41 . Next, the thermally foamable coating material was applied with a roller to form a thermally foamable coating material layer, and a specimen was prepared. At this time, while measuring the film thickness using an eddy current film thickness meter at the portion where the auxiliary member of the specimen was fixed, the thermal foaming coating material layer was applied so that the film thickness was uniform (3.7 mm). formed.
A heating test was performed for 3 hours according to the standard heating curve of ISO834 for the prepared specimen. As a result, a substantially uniform carbonized heat insulating layer was formed without falling off, exhibiting good heat resistance performance.

(Test example 2)
As shown in FIG. 7, the surface of H-shaped steel frame 41 (H400 × 200 × 8 × 13 mm, length 1200 mm) is covered with a fiber-based heat insulating material having a thickness of 25 mm. [Auxiliary member shown in FIG. 5 (II) (iron, rectangular plate shape: 1.5 cm × 1.5 cm × thickness 0.6 mm, area 2.25 cm ² , fastener (iron, length 15 mm, thickness 1.2 mm )] was pierced and fixed.At this time, auxiliary members were fixed at intervals of 300 mm in the length direction of the H-shaped steel frame 41. Then, the thermal foaming coating material was applied with a roller to form a thermal foaming coating material layer. At this time, while measuring the film thickness using an electromagnetic film thickness meter, the film thickness is uniform (3.7 mm) at the part where the auxiliary member is fixed. A thermally foamable coating layer was formed as follows.
A heating test was performed for 3 hours according to the standard heating curve of ISO834 for the prepared specimen. As a result, a substantially uniform carbonized heat insulating layer was formed without falling off, exhibiting good heat resistance performance.

Claims (3)

A covering structure in which a thermally foamable covering material layer is laminated on a base,
The base is a non-metallic material,
An auxiliary member is fixed to the surface of the base,
The auxiliary member has a metal material at least on its upper surface,
A covering structure, wherein a thermal foamable covering material layer is laminated so as to cover the auxiliary member on the base. 2. The covering structure according to claim 1, wherein the auxiliary member has an area of 1 cm< ² > or more and a thickness of 0.1 [mu]m or more and 5 mm or less. A method for measuring the film thickness of the thermally foamable covering material layer in the covering structure according to claim 1 or 2,
A film thickness measuring method, wherein the distance from the surface of the thermally foamable covering material layer to the auxiliary member is measured by an electromagnetic or eddy current film thickness gauge.

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