JPH01174744A - Outside wall joint structure - Google Patents

Abstract

PURPOSE:To prevent the spread of fire from a joint part in a fire accident by forming a foamed type fireproof paint layer which forms a foamed heat insulating layer through heating, onto the joint part between the outside wall panels. CONSTITUTION:A foamed type fireproof paint layer 6 which forms a foamed heat insulating layer through heating is formed on the joint part 5 between the outside wall panels. The fireproof paint at least contains the carbonized expansion agent, dehydrating catalyst, pigment, and emulsion type vehicle, and viscosity is adjusted to 10,000-100,000cps. Therefore, the spread of fire from the joint part 5 in a fire accident can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a joint structure of an exterior wall panel that is provided with fireproof performance.

[Conventional technology]

With the development of large exterior wall panels with fire-retardant properties, the fire-retardant properties of joints between exterior wall panels are being reconsidered in order to prevent the spread of fire in the event of an actual fire.

Conventionally, in order to impart fireproofing properties to these joints and prevent the spread of fire from the joints, foamed asbestos (product name: Litoflex, manufactured by Nichias, etc.) was inserted into the bottom of the joints, and caulking was applied over the top. The method of doing this has been adopted.

[Problem to be solved by the invention]

However, since the joint width has an error of about ±2 mm that occurs during manufacturing, in the above method, two to three types of Lidoflex with different width dimensions must be prepared accordingly. Furthermore, if they are even slightly larger than the joint width, it may be difficult to insert them into the joint.
It also has the following problems.

Therefore, this invention eliminates the need for such time-consuming and troublesome work, reduces the number of steps, increases workability, and
The objective is to provide an exterior wall joint structure that is efficient and has excellent fire prevention performance.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention uses a fireproofing paint that is foamable, that is, has the property of foaming when heated, for the joint portion. In other words, the present invention relates to a joint structure between exterior wall panels, which is characterized by being provided with a foamed fire protection paint layer that becomes a foamed heat insulating layer when heated. will be explained in detail with reference to the drawings.

Figure 1 schematically shows a cross section of an exterior wall panel and its joints, where ■ is a base material (base material), 2 is a core material that supports the panel, 3 is a heat insulating material, 4 is an exterior material, and 5 is an exterior material. Joint part of 4, 6
7 is a foamed fireproofing paint layer inserted into the joint portion 5, and 7 is a waterproof layer.

As the base material 1, a fire-retardant material such as gypsum board is used, but it is not limited to this, and plywood, particle board, asbestos slate, hard fiberboard (
Product name Nihard Board).

Common base materials such as soft fiberboard (-ship name: insulation board) are also used.

The core material 2, which mainly serves to provide strength to the entire exterior wall panel and support the panel, is not particularly limited to wooden frames, iron frames 9, synthetic wood (plastic processed/molded products), etc. The framework method etc. can also be arbitrarily selected, such as a normal large wall structure, a steel rigid frame structure, etc.

The heat insulating material 3 is not particularly limited, and rock wool, glass wool, plastic foam (styrene foam), etc. can be used.

As the exterior material 4, asbestos slate, asbestos cement calcium silicate board, ALC (autoclaved lightweight aerated concrete), etc. are used, but it is limited to these as long as it has flame retardancy (fire retardant). There isn't. These are pasted on the heat insulating material 3 by any method to form joint portions 5 such as vertical joints (joint joints) and horizontal joints (overlap joints).

The fire-retardant paint that constitutes the foam-type fire-retardant paint layer 6 inserted into and formed in this joint portion 5 can be foamed by heating to form a heat insulating layer (carbonized layer), and is not particularly limited, but at least Carbonized expansion agent.

Those containing a hydrocatalyst, a pigment, and an emulsion type vehicle have excellent performance. Furthermore, in consideration of workability, the viscosity is preferably adjusted to 10,000 to 100,000 cps so that it can be automatically inserted into the joint portion 5 by a pressure feeding method.

In this fire protection paint, the carbonized expansion agent carbonizes when heated to form a foam layer, and this foam layer acts as a heat insulating layer that blocks heat. For example, it is preferable to use dipentaerythritol, pentaerythritol, etc., but the present invention is not limited thereto.

The dehydration catalyst is a substance that dehydrates and carbonizes the substance that forms the carbonized layer, and at the same time, it is an inorganic phosphate (ammonium salt, etc.) that plays the role of forming a nonflammable inorganic phosphoric acid film. You can use things like
It is not limited to these. More specifically, primary phosphates.

Examples include dibasic phosphates, tertiary phosphates, and low condensation polyphosphates.

As the pigment, inorganic pigments having flame retardancy are appropriately selected, and examples include coloring pigments such as titanium white and carbon black, and extender pigments such as talc, calcium carbonate, pallite, mica, kaolin, and silica sand powder. Can be mentioned.

As a vehicle (color vehicle) for fire protection paints, the emulsion type color vehicle adheres to the object to be coated to form a continuous film and acts to bind the pigments, but is not particularly limited. It is preferable to use an expanding agent that does not inhibit the foaming properties of the expanding agent and has excellent properties such as adhesion to the object to be coated and flexibility. Examples of such color vehicles include acrylic resin emulsions, vinyl acetate resin emulsions, and rubber latexes. The acrylic resins include (meth)acrylic acid, esters of (meth)acrylic acid such as methyl, ethyl, butyl, and 2-ethylhexyl, and monomers such as (meth)acrylamide and (meth)acrylonitrile. Examples include polymers or copolymers of these (meth)acrylic monomers and copolymers of styrene, ethylene, vinyl chloride, vinyl acetate, maleic anhydride, and the like. Examples of the rubber latex mentioned below include styrene-butadiene rubber, modified styrene-butadiene rubber, chloroprene rubber, and natural rubber.

Each of the above components may be used alone, or
It goes without saying that multiple types may be used in combination, and their blending amounts are not particularly limited, but in consideration of various balances such as foamability and coating performance of the fire prevention paint, carbonized expansion agents 10 to 25 %Hydrothermia catalyst
20-30% pigment
5-15% emulsion type vehicle 25-45
% (where % indicates weight %) is preferable. Furthermore, it is diluted with water, etc., and the viscosity of the paint is 10,000 to 10,000 as described above.
It is preferable that it is adjusted to about 10,000 cps. By adjusting the viscosity in this way, it is possible to automatically feed the paint as described below, and the coating efficiency can be greatly improved.

In addition to the above-mentioned components, the above-mentioned foam-type fireproofing paint contains various additives such as an antifoaming agent, a thickener, a dispersant, a preservative/mold inhibitor, and a rust inhibitor. Good too.

These additives are not particularly limited, but antifoaming agents include silicone oils and higher alcohols, thickeners include methylcellulose, carboxymethylcellulose, and various acrylic emulsions, and dispersants include sodium alkylbenzenesulfonate. , organic types such as polyvinyl alcohol, hydroxyethyl cellulose, polyoxyethylene alkyl esters, fatty acid esters, inorganic types such as sodium phosphate and sodium silicate, and polymeric types such as polyester and epoxy as plasticizers. Monomeric products such as phthalate esters and formalin are used as preservatives and fungicides.

Examples include boric acid and the like, and all are appropriately blended within the range of amounts that do not impede the effects of the paint.

A method of forming such a foamed fire protection paint layer 6, that is,
There are no particular limitations on the method of inserting the fire prevention paint into the joints 5, and it can be done by normal brushing, spray painting, etc. However, from the standpoint of workability and efficiency, it can be done automatically by adopting a pressure-feeding method, etc. Preferably, it is delivered. For example, if a pressure-feed spray gun is used, it is possible to continuously form a thick coating film over a wide area, and it is also possible to paint with less paint scattering.

The thickness of the formed fire protection paint N6 is preferably one fin or more so as to exhibit sufficient fire protection performance. On the other hand, in consideration of the thickness of the exterior material 4 and the possibility of further layering a waterproof layer such as the caulking material layer 7 described below, etc., it is appropriate that the thickness be within about 10 mm.

In general, many foamable fireproofing paints have the drawback of poor water resistance and weather resistance, so a waterproof layer 7 is formed on the foamable fireproofing paint layer 6 to cover these drawbacks. You can leave it there. The material forming the waterproof layer 7 is not particularly limited, but it is preferable to use a flame-retardant material such as a silicone caulking material (sealing material). Alternatively, you may use a flame-retardant fire-prevention paint for topcoating (this is a coating film itself that is flame-retardant, such as a chlorine-containing resin such as vinyl chloride resin or chlorinated rubber) or a flame-retardant paint. Examples include organic types using bromine resin as a vehicle, and inorganic types consisting of silicates of alkali metal salts and phosphates.

Note that the exterior wall joint structure according to the present invention is not limited to the above-mentioned embodiments, and for example, foam type fire prevention paint M6
In addition, a refractory composition layer made of a refractory putty, a refractory cement, a composition containing inorganic powder, or the like may be provided. Further, the exterior wall panel may not include the heat insulating material 3, or may have an effect other than heat insulation such as soundproofing.In short, as long as the exterior wall panel has joints, The effects of this invention can be obtained.

〔Example〕

Next, examples and comparative examples of the present invention will be described with reference to the drawings.

■ ゛・゛の'' A foaming type fireproofing paint (non-flame ■ type) was prepared by blending the following components. (The numbers indicate weight%) Dipentaerythritol as a carbonization expansion agent 16.0 No. 1 as a dehydration catalyst Ammonium triphosphate 17.0 Titanium white as a pigment 10.0 Vinyl acetate-ethylene-vinyl chloride cofi combination as a co-mulsion type vehicle (Movinyl 117E manufactured by Hoechst Synthesis) 38.0 Sannopco 8034L as an antifoaming agent (Sannopco 8034L) as an antifoaming agent 0.5 Sodium tripolyphosphate as a dispersant 0.5 Polyvinyl alcohol as a thickener 1.0 Water as a diluting solvent 17
．． The viscosity of the obtained fire protection paint was 16,000 cps, and the solid content was 67±3%.

(Examples 1 to 4) As shown in FIG. 2, a particle board 10 and two fly ash slag cement type (NFC: non-asbestos) exterior boards 40 are pasted together and fixed at four locations with screws 8. A test plate was prepared.

In the figure, the length of particle board 1o.

The width Wl is 150 m, the thickness Dl is 12 m, the length of the exterior plate 40 is 144 m, the width W is 65 m, and the thickness D2 is
is 12 N@, and the joint width w3 is 8 mm. A thermometer insertion hole 9 with a diameter of 8 mm was provided on the back side of the center of the test plate so that the temperature on the back side of the joint could be measured.

As shown in FIG. 3 (al), the obtained fireproof paint non-frame ■ type was injected into the joint portion 50 with the thickness shown in Table 1 using a pressure-feeding tank (NP1844SV manufactured by Asahi Okuma Sangyo Co., Ltd.). After drying indoors for 5 days, fire protection and paint layer 6
0 was formed.

(Examples 5 to 8) In the same manner as in the above examples, after injecting the fire prevention paint as shown in Fig. 3, the fire prevention paint layer 60 is formed by drying at 120°C/1 minute in a dryer. Next, - Liquid moisture curing modified silicone sealant (National Housing Industry ■
A waterproof layer 70 was formed by injecting Panahome Sealant) and drying it indoors for 5 days.

(Comparative Example 1) The joint portion 50 of the test board similar to the above example was
1, the above sealing material alone was injected to a thickness of 120 mm and dried indoors for 5 days to form a waterproof layer 70.

(Comparative Example 2) As shown in FIG. 3(d), nothing was injected into the joint portion 50 of a test board similar to that of the example, and this was used as a test piece without coating.

(b) - A thermometer capable of measuring up to 1200° C. was inserted from the back side into the temperature needle insertion hole 9 of the test specimens obtained in the above Examples and Comparative Examples.

The flame of the propane gas burner was adjusted so that the temperature of the burning surface of the test piece was 900° C., and the flame was applied vertically to the center of the joint of the test piece, and heating was performed for 30 minutes and 50 minutes, respectively.

The measurement results of the joint back surface temperature are shown in FIGS. 4 to 6.

For Examples 1 to 4 in which only fire prevention paint was injected, the fourth
As shown in the figure, the thicker the paint film (in Figures 4 and 5, each symbol represents the following fire protection paint film thickness before drying; white circle: 2 + n, Δ: 3 m, Black○
: 4m, X: 5mm), there is little rise in temperature on the back side, there are few flames during heating, and the time for their generation is short. Almost no smoke is generated after heating is stopped after 30 minutes.

As shown in FIG. 5, in Examples 5 to 8 in which fireproof paint and sealant were injected, the temperature increase was suppressed in all cases, almost unaffected by the film thickness of the paint. When heated, the sealant burns and a flame is generated, but the flame subsides midway through, and almost no smoke is generated after 30 minutes of heating. As is clear from the comparison with FIG. 4, when the fire-retardant paint is combined with a sealant, the rise in back surface temperature is smaller and the fire-retardant performance is better. This is considered to be because the ash after combustion of the sealant also exerts a heat insulating effect.

In the test specimen of Comparative Example 1 in which only the sealant was injected, which is indicated by the broken line in FIG.
After 30 minutes, the temperature was relatively low at 192°C, but the test specimen emitted flames and burned, and even after heating was stopped after 30 minutes, the combustion with flames remained at 11! continued. In addition, even after the flames were blown out, smoke remained for more than 15 minutes and the smoldering state continued for a long time. The sealant after heating for 30 minutes turned into white ash. On the other hand, in the case of heating for 50 minutes, it was observed that the particle board had burned in the center of the test plate on the back side. Therefore, even if only Vanahome sealant is inserted into the joint, after the sealant itself burns,
It is thought that wood burning will continue indefinitely.

Similarly, in Fig. 6, the test piece of Comparative Example 2 with unpainted joints, where the solid line is drawn, started to burn due to heating, and the temperature rose rapidly while burning, reaching 300°C in 21 minutes, so the temperature dropped. Measurement was canceled. After heating for 30 minutes, the joints of the test specimen were deeply carbonized.

In addition, as a result of observing the state of the particle board of the test piece after the heating test, it was found that only in the test piece of Comparative Example 2 with unpainted joints, the combustion state did not spread to the sheet metal body, and blackening occurred mainly at the central joint. The situation was as follows. This is because in other test specimens, the flame spread horizontally due to the flame retardant sealant and/or fireproof paint injected into the joints, and the entire specimen was in a state of combustion. In contrast, in Comparative Example 2, combustion proceeded concentrated at one joint area where the flame hit, and a charred layer spread within the wood.

The above results are summarized in Table 1.

・As shown in Table 1, the test specimen of the example in which the foamed fire-retardant paint was inserted into the joints suppressed the temperature rise on the back side, produced less flame and smoke, and had good fire-retardant performance. It has been found. It has also been revealed that this fireproofing paint exhibits excellent effects when used in combination with flame-retardant sealants and the like.

〔Effect of the invention〕

The exterior wall joint structure according to the present invention is as described above,
It is characterized by a foam-type fire-retardant paint layer that forms a foam heat-insulating layer in the event of a fire, which prevents the spread of fire from the joints, making it possible to create an exterior wall with excellent fire-retardant performance.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of an example of an external wall joint structure according to the present invention, Fig. 2 is a perspective view of a test plate in an example of the invention and a comparative example, and Fig. 3 (al to (d)). are the same〈Schematic cross-sectional diagram of the joint part of the test specimen in the example and comparative example, Figures 4 to 6 are the same〈One combustion test result (temperature change on the back side of the test specimen) of the example and comparative example is shown in a graph. Yes. 1... Base material 4... Exterior material 5... Joint area 6
... Fire protection paint layer agent Patent attorney Takehiko Matsumoto 3rd (a) (c) (b) (d)

Claims (2)

[Claims] (1) An exterior wall joint structure characterized in that the joint between exterior wall panels is provided with a foamed fire prevention paint layer that becomes a foamed heat insulating layer when heated. (2) Claim 1, wherein the foaming type fireproofing paint contains at least a carbonized expansion agent, a dehydration catalyst, a pigment, and an emulsion type color vehicle, and has a viscosity adjusted to 10,000 to 100,000 cps. Exterior wall joint structure described.