JPH08333846A - Watertight connecting method of roof member - Google Patents

Abstract

PURPOSE: To seal and bond and fix roof members easily and efficiently by coating or filling the superposing sections of the roof members with expansion type adhesives and connecting the roof members. CONSTITUTION: One pack type moisture-curing type urethane resin adhesives or two pack type foamed urethane resin adhesives are used, and the superposing sections of roof members are coated or filled with the adhesives. It is desirable that the adhesives having the content of 4-25% of NCO groups in the former adhesives A are employed. A catalyst for adjusting a curing time and various additives as required are compounded with a urethane polymer acquired by a reaction between polyol and polyisocyanate in the adhesives A. When the roof members are coated with such adhesives A, the adhesives A react with moisture in air and cure. Bonding construction can be executed regardless of the extent and shape of the areas of adhesive surfaces without regard to the volume of the superposing sections of the roof members, and the clearances of the superposing sections of the roof members are coated or filled completely, thus holding watertightness and airtightness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a watertight connecting method for roof members, which is capable of completely waterproofing performance by applying or filling an expansive adhesive to the superposed portion of various roof members used for roof construction. .

[0002]

2. Description of the Related Art In the conventional roof construction, for example, when laying a plurality of Japanese tiles, the both ends of the Japanese tiles are raised, they are polymerized to drain, and rainwater is made to flow down using a roof slope, In the case of a flat plate, a method is adopted in which a large number of overlapping portions are taken and laid out. Further, in the case of color galvanized iron, various construction methods such as caulking the polymerized portion, winding the polymerized portion, or covering the polymerized portion with a roof bar are used.

[0003]

However, in any case, since there is a gap between the roof members, rain leakage due to strong wind cannot be prevented, and a spillage phenomenon (snow covered with snow hits the sunlight, Water accumulates in the upper part of the snow that has melted and has not melted, and since this accumulated water does not flow down, it is a phenomenon that causes rain leakage by intruding into the back side of the roof from the draining and caulking parts of the roof due to capillary phenomenon etc.) It cannot prevent rain leaks caused by.

A sealing gasket is conceivable as a material for ensuring the watertightness and airtightness of the polymerized portion. However, since the gaps in the polymerized portion of the roof member are non-uniform, many materials are required and it is economical. At present, it has not been put to practical use.

In addition, a roof member simply superposed like a Japanese roof tile has a risk that the superposed part is displaced due to vibration such as an earthquake to cause rain leakage or, in an extreme case, to fall off. Even if they are fixed with nails, they are not enough in the event of a large earthquake.

Therefore, the present invention has been made in view of the above situation, and its purpose is to make the area of the adhering surface large or small, regardless of the gap between the overlapping portions of the roof member. Not only can the bonding work be performed easily regardless of the shape, etc., but under any conditions,
It is an object of the present invention to provide a watertight connecting method for a roof member, which is capable of adhesively fixing the roof member while easily and efficiently sealing the roof member by preventing rain leakage.

[0007]

Means for Solving the Problems As a result of intensive research for solving the above-mentioned problems, the present inventor has found that roof members such as Japanese roof tiles, metal roof tiles, western roof tiles, slate, colored galvanized iron, asphalt, and inorganic single boards. The present invention provides a method for water-tightly connecting a roof member, which comprises:

As the adhesive, a one-component moisture-curable urethane resin adhesive (hereinafter, simply referred to as an adhesive A) or a two-component urethane foam resin adhesive (hereinafter, simply an adhesive B).
Called. ) Is used to coat or fill the polymerized portion of the roof member. The former adhesive A is N in the adhesive A.
It is preferable to use one having a CO group content of 4% to 25% because of the effect described later.

The adhesive A comprises a urethane polymer obtained by reacting a polyol and a polyisocyanate with a catalyst for adjusting the curing time and, if necessary, various additives.

As the polyol, low molecular weight polyols (ethylene glycol, propylene glycol, glycerin, trimethylolpropane, triethanolamino, pentaerythritol, sorbitol etc.), water, low molecular weight polyols and polyamines (ethylenediamine, diethylenetriamine tolylenediamine etc.) Polyether polyol having a structure in which alkylene oxide (ethylene oxide, propylene oxide, etc.) is added to dicarboxylic acid [succinic acid, maleic acid, sebacic acid, adipic acid, fumaric acid, phthalic acid, dimer (dimer) acid] Etc.] with the above-mentioned low molecular weight polyol, a polyester polyol obtained by the ring-opening polymerization of a lactone, a polylactone polyol obtained by the ring-opening polymerization of tetrahydrofuran, and the like. And tigers methylene glycol,
Castor oil or its alkylene oxide addition modified products,
Examples thereof include a polymerized product of a diene compound and a polydiene polyol having a hydroxyl group at the terminal or a hydrogenated product thereof. These polyols may be used alone or in combination of two or more.

Examples of polyisocyanates include aromatic polyisocyanates [2-4-tolylene diisocyanate (TDI) and the like], aliphatic isocyanates (hexamethylene diisocyanate (HDI) and the like], alicyclic polyisocyanates (3-isocyanate methyl). -3, 5, 5
-Trimethylcyclohexyl isocyanate, etc.), arylaliphatic polyisocyanates, and their carbodiimide-modified or isocyanurate-modified polyisocyanates. These polyisocyanates may be used alone or in combination of two or more.

Particularly preferred are 4,4'-diphenylmethane isocyanate, 2,4'-diphenylmethane diisocyanate, p-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate and the like.

The ratio of polyol to polyisocyanate is usually 1.5 equivalents of polyisocyanate to 1 equivalent of polyol. The total equivalent of both is preferably 1.7 to 5 equivalents.

As the catalyst, the adhesive A obtained by blending is used.
, Which are excellent in storage stability, for example, bis (morphoethyl ethyl) ether, bis (2,6 dimethyl morpho ether ether) ether and other bis morpho ethyl ethers, tris (2,6 dimethyl morpho ether) Amine, bis (dimethylamino ether) ether and the like are used. Although the amount of the catalyst used varies depending on the type, it is usually 0.01 parts by weight to 5 parts by weight with respect to 100 parts by weight of the urethane polymer, and particularly preferably 0.05 parts by weight to 3 parts by weight.

Various kinds of additives are used as needed. Examples of the additives include fillers (calcium carbonate, titanium dioxide, clay), thixotropy imparting agents, defoamers, ultraviolet absorbers, colorants, stabilizers. There are agents, etc.

The NCO group content of the adhesive A is 4%.
However, the range of 8% to 20% is particularly preferable. This is because if it is less than 4%, the foaming of the adhesive A will be less and the effect of filling the gaps in the polymerized portion will be too small, so a large amount of the adhesive A will be required.
On the other hand, if it exceeds 25%, the cured product of the adhesive A becomes brittle.

The adhesive A may be added with a catalyst, a stabilizer and various additives afterwards to the urethane polymer, but when the urethane polymer is produced, the catalyst, the stabilizer and various additives are added in advance. , Store in a container (can, cartridge) that can block moisture. And when opening,
The coating is applied to the overlapping portion of the roof member.
Then, the adhesive A reacts with moisture in the air and hardens. The viscosity of the caulking agent is 10 PS to 5000 P.
S.

Next, the latter adhesive B is obtained by mixing and stirring a polyisocyanate prepolymer and a foaming agent. The main material used in the present invention is a polyisocyanate-based prepolymer alone and a mixture of the catalyst and the catalyst. As the foaming agent, a catalyst, a surfactant, a thickener and various additives dissolved or dispersed in water, or a powdery filler is impregnated with water, the catalyst and various additives. Use what you have.

The content of NCO groups in the prepolymer obtained by the reaction of polyisocyanate and polyol is 4% or less. TD as polyisocyanate
I (tolylene diisocyanate), MDI (diphenyl methane 4-4 'diisocyanate), NDI (1-5 naphthalene diisocyanate), TODI (trizine diisocyanate), HDI (hexamethylene diisocyanate), IPDI (isophorone diisocyanate), X
DI (xylylene diisocyanate) etc. are mentioned.

Examples of the polyol include amine compounds, polyethers, polyester polyols, polylactone polyols, polydiene polyols and water additives thereof.

As the catalyst to be mixed, a foaming catalyst such as a morpholine type or piperazine is most suitable.

The surface active agent reduces the surface tension of water, so that the water is atomized and uniformly dispersed in the prepolymer. The reaction between the two rapidly proceeds while generating carbon dioxide gas. Foams and expands. The surfactant used for this is
A nonionic surfactant having an HLB value of 9 to 12. As the addition amount, it is preferable to use one having a dispersion equivalent amount of 1% to 10%.

When water, which is a foaming agent, is mixed with the polyisocyanate-based prepolymer, the viscosities of the two are largely different from each other, so that it is difficult to disperse them, and it is difficult to obtain a uniform foam. To facilitate mixing. As the thickener, gelatin, egg yolk, tragacanth gum, methyl cellulose and the like are used.

A powdery filler such as diatomaceous earth, kaolin, talc, perlite or calcium carbonate impregnated with water is mixed and dispersed in a polyisocyanate prepolymer, and water adsorbed on the powder is reacted. It is possible to obtain a uniform foam. Especially diatomaceous earth is 150% to 18
Since the powder is exposed to 0% of water, it can be easily mixed with the polyisocyanate prepolymer and uniformly dispersed, and the foaming reaction can be carried out promptly.
Most suitable. Further, fine powder of cement hydrate, slaked lime, etc. are also suitable foaming raw materials.

[0025]

EXAMPLES Example 1 I, II, III and I of Formulation 1 shown in Table 1
V in a universal mixer at 50 ° C to 60 ° C for 1 hour, then add V and mix for an additional 1 hour to prepare adhesive A [J. C-Composite Co., Ltd., trade name Bubble Bond 1, NCO group content 7%, viscosity 120 PS (25
℃)] is made. Then, this adhesive A was applied to or filled in the polymerized portion of the metal roof tile (Nakayama Kasei Co., Ltd., product name Roufix) and temporarily fixed by nailing. It was completely filled and kept airtight.

[0026]

[Table 1]

Example 2 An adhesive B is prepared by mixing and stirring the foaming agent prepared by the formulation 2 shown in Table 2 as shown in the formulation 3 shown in Table 3. When it is applied or filled to the polymerized portion of the roof member, the adhesive B foams and expands 10 to 20 times while generating carbon dioxide gas, and when the adhesive B is pressed against the adherend surface, the adhesive B has a desired thickness. In addition to having the flowability of deforming into, and having the adhesive strength and structural viscosity sufficient to hold the roof member, rain leakage can be prevented under any weather conditions.

[0028]

[Table 2]

[0029]

[Table 3]

Adhesives A and B obtained similar good results not only for metal roof tiles but also for Japanese roof tiles, slate, colored galvanized iron, western roof tiles, organic single boards, inorganic single boards and the like. .

[0031]

According to the present invention, not only can the bonding work be carried out easily regardless of the size of the gap in the overlapping portion of the roof member and regardless of the size or shape of the area of the bonding surface, but any Even under the conditions, by preventing rain leakage in advance, it is possible to easily and efficiently seal the roof member, and to completely apply or fill the gap to maintain watertightness and airtightness.

Further, in the case of the compounding 1, that is, when the adhesive prepared by mixing the urethane polymer with the additive and the catalyst is used, the watertightness and the airtightness are excellent, and the waterproof performance can be perfected.

Further, when using the compounding 3, that is, the adhesive prepared by mixing the one-component moisture-curable urethane resin-based adhesive and the foaming agent obtained by the compounding 2, the carbon dioxide gas is generated. It has 10 times to 20 times foaming and expansion and has flowability, adhesive strength and structural viscosity capable of being deformed to a desired thickness, so that rain leakage can be prevented under any weather condition.

In addition, by coating or filling the superposed portion of the roof member with an expansive adhesive, the roof member has some elasticity, so that even if the roof member is displaced due to an earthquake, a gap may be generated. There is nothing to do.

Claims (6)

[Claims] 1. A roof member such as a Japanese roof tile, a metal roof tile, a western roof tile, a slate, a color tin, an asphalt, and an inorganic single plate is polymerized, and the polymerized portion is coated or filled with an expansion adhesive to be connected. A watertight connection method for roof members. 2. A one-component moisture-curable urethane resin adhesive is used as an adhesive, and the content of isocyanate groups (hereinafter referred to as NCO groups) in the adhesive is 4% to 25%. The watertight connection method for a roof member according to claim 1, wherein the roof member is used. 3. The watertight connection method for a roof member according to claim 1, wherein a two-component urethane foam resin adhesive prepared by mixing a polyisocyanate prepolymer and a foaming agent is used as the adhesive. 4. The watertight connection method for roof members according to claim 3, wherein a polyisocyanate prepolymer containing a catalyst is used. 5. As a foaming agent, water, a catalyst, a surfactant,
The watertight connection method for roof members according to claim 3 or 4, wherein a material containing a thickener is used. 6. The watertight connecting method for a roof member according to claim 3, wherein a foaming agent containing a filler is used.