JP2007100378A - Sealing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing method of a joint formed between sidings, according to which a rubber-like elastic cured product free from damage can be formed even if a sealing material is displaced in the process of curing, by filling the sealing material that is curable by moisture or oxygen in the atmosphere, in the joint, and uniformly curing the sealing material on both of front and bottom sides thereof. <P>SOLUTION: The sealing method is provided for filling the sealing material in the siding joint having a joint bottom formed of an air-permeable molded body, and curing the sealing material. The air-permeable molded body is preferably an air-permeable open-cell foamed molded body. The sealing material is preferably one that is cured beginning from a surface making contact with the atmosphere, including a one-part moisture curable polyurethane sealing material, a one-part moisture curable modified silicone sealing material, and a one-part moisture curable silicone sealing material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides a sealing material that forms a cured rubber-like elastic body that is not damaged by uniform curing from both the front surface that is in contact with the atmosphere and the back surface that is not in contact with the air even when the sealing material is displaced during curing at the siding joint. Regarding the method.

Conventionally, in the field of architecture, as a member that mainly forms the outer wall of buildings for detached houses and apartment buildings, a dry-type board that has been manufactured in advance in a factory, called ceramic siding or metal siding, is pasted. Since the construction method that forms the outer wall is a dry construction method that is simply fastened to a wooden frame with screws etc., it has the advantage that it can be constructed in a short period of time and can be built at low cost, so it is widely adopted. .
In the outer wall formed by this siding, joints are formed at the butt of siding and siding, or the butt of sash and siding, and this joint is filled with a sealing material to prevent rain leakage and hardened. It is necessary to adhere and waterproof, and various sealing materials are used. In the field of siding outer wall construction, there is no need to mix the main agent and curing agent, and it has excellent workability, so it can be cured from surfaces that come into contact with air, such as one-component moisture-curing urethanes and modified silicones. Sealing material is widely used.

  In general, in joints formed by siding, movement due to shrinkage due to drying of siding, repeated expansion and contraction due to temperature difference between day and night, or wind pressure, etc. is larger than other building outer walls such as mortar and concrete, The joint width also varies greatly, and the sealing material filled in the joint is also subjected to a large displacement due to the joint width variation during curing. In the case of the above-mentioned one-component moisture-curing sealing material, curing proceeds from the surface open to the inside of the sealing material that comes into contact with moisture (humidity) in the atmosphere. As a material for forming the joint bottom of the joint having the member as a constituent member, a non-ventilating material such as a metal hat joiner or a closed-cell polyethylene backup material 15 as shown in FIG. 10 is used. Since the curing does not proceed from the bottom surface of the material, it is in an uncured state, and there is a difference in the curing rate between the surface and the interior. The uncured part of the material cannot follow the displacement, resulting in damage such as cracks, causing defects such as wrinkles on the surface of the sealing material after hardening, leading to water leakage accidents.This problem tends to occur particularly when the temperature difference between spring and autumn is large.

In addition, a backup material formed with a non-breathable surface layer for the purpose of effectively controlling the elliptical bulge that protrudes from the surface of the sealing material, so that the surface layer faces the opening side of the joint. A joint structure of ceramic siding boards loaded in the back part of the joint part has been proposed (see Patent Document 1), but it still prevents the occurrence of damage such as cracks when subjected to displacement during curing. It is not possible to solve this problem.
JP-A-10-219960

  In view of the above-mentioned problems of the prior art, the present invention is a method for sealing joints formed by siding, and is filled with a sealing material that is cured by moisture or oxygen in the atmosphere. It is an object of the present invention to provide a sealing method for forming a cured rubber-like elastic body that is not damaged even when the sealing material is displaced during the curing by curing almost uniformly from both sides of the bottom surface.

In order to achieve the above-mentioned object, the present inventors have intensively studied, and as a result, in the joint mainly formed on the outer wall of the building formed by siding, a breathable molded body was loaded at a location which becomes a bottom portion of the joint. By filling the joint with a sealing material for construction, constructing it, and curing it, the sealing material can be cured substantially without damage even if it is displaced by fluctuations in the joint width direction during the curing of the sealing material. The present invention has been completed by finding an architectural sealing method capable of obtaining objects.
That is, this invention is shown by the following (1)-(12).

(1) A sealing method characterized by filling a siding joint having a joint bottom made of a breathable molded body with a sealing material and curing.
(2) The sealing method according to (1), wherein the breathable molded article is a breathable open-cell foamed molded article.
(3) The sealing method according to (1), wherein the breathable molded body is a breathable adhesion preventing member.
(4) The sealing method according to (1), wherein the breathable molded body is a breathable backup material.
(5) The sealing method according to (1), wherein the breathable molded body is a breathable joiner.
(6) The sealing method according to any one of (1) to (5), wherein the air-permeable surface of the air-permeable molded body forms a joint bottom in a direction in contact with the sealing material.
(7) The sealing method according to (2), wherein the breathable open-cell foamed molded product is a polyurethane-based open-cell foamed molded product.
(8) The sealing method according to any one of (1) to (7), wherein the sealing material is a sealing material that cures from a surface that contacts the atmosphere.
(9) The sealing method according to (8), wherein the sealing material that is cured from the surface in contact with the air is a one-component moisture-curing urethane-based sealing material.
(10) The sealing method according to (8), wherein the sealing material that cures from the surface that contacts the atmosphere is a one-component moisture-curing modified silicone-based sealing material.
(11) The sealing method according to (8), wherein the sealing material that cures from the surface in contact with the air is a one-component moisture-curing silicone sealing material.
(12) The sealing method according to any one of (1) to (11), wherein a curing rate from the surface side opened to the atmosphere of the sealing material is substantially the same as a curing rate from the bottom surface side.

  In the sealing method for joints formed by siding for the first time according to the present invention, the surface of the sealing material is filled with a sealing material, particularly a sealing material that hardens from the surface that comes into contact with the atmosphere due to moisture or oxygen in the atmosphere. As the curing progresses almost uniformly from both sides of the bottom surface, it is possible to provide a sealing method for forming a cured rubber-like elastic body that is not damaged even if the sealing material undergoes a large displacement during the curing. It was.

Hereinafter, the present invention will be described in detail.
First, the siding joint in the present invention will be described.
In buildings where siding is mainly used as an outer wall material (including when it is used as an inner wall material), ceramic-based and metal-based siding members are mainly used for the base of wooden materials such as pillars and trunk edges of outer wall parts. The outer wall is constructed by attaching with screws. In this siding outer wall, a joint serving as a buffering portion is provided at the abutting portion between the siding member and the siding member, or the abutting portion between the siding member and the sash member, in order to prevent warpage or destruction due to mutual expansion of the members. . A joint formed by using this siding as at least one component is a siding joint.
This siding joint is filled with a breathable molded product (also referred to as breathable) to form the joint bottom, and then the sealing material, especially the atmosphere, is used for the purpose of absorbing waterproofing and distortion due to expansion / contraction and warpage of the siding. The sealing method of the present invention is a method of filling a sealing material that is cured by filling an elastic sealing material that hardens from a surface that contacts the sealant.
By adopting the sealing method of the present invention, even if the sealing material is subjected to a large displacement during the curing, it becomes a rubber-like elastic body cured without damage, and can form a sealed siding joint that is free from problems such as water leakage. Is. This is because a cured film is formed on the bottom surface side of the sealing material that contacts the air-permeable molded body almost simultaneously with the formation of a cured film on the surface of the sealing material filled in the joint that is open to the atmosphere. Therefore, damage such as cracks due to concentration of stress and strain does not occur.

Specifically, a sealing method using a breathable open-cell foamed molded article as a breathable molded article on the joint floor will be described with reference to the drawings, but the present invention is not limited thereto. As shown in (1) of FIG. 1, the siding member 2 and the siding member 3 are opposed to each other so as to have a distance W, and the body edge member 20 is bonded to each other with a screw to form an outer wall and a joint. 1 is formed. Next, a flat plate-shaped backup material 4 made of an open-cell foamed molded article having air permeability is loaded into the joint 1 so that the joint depth is D, thereby forming the bottom of the joint. A space surrounded by three surfaces of the end surfaces 2a and 3a of the siding members 2 and 3 and the surface 4a of the backup material 4 is filled with a sealing material. The W is a joint width, and the normal W is preferably set in a range of 5 to 15 mm. In addition, illustration of the screw is abbreviate | omitted in FIG. Next, a primer is applied to the surfaces 2a and 3a, which become adherend surfaces when filled with a sealing material, with a brush or the like, left for a predetermined time of about 20 minutes to 1 hour, and after taking an open time, the surface that comes into contact with the atmosphere 1 is filled with an elastic sealing material that cures from the surface, and the excess sealing material protruding from the joint is scraped with a spatula to flatten the surface and cured to form a sealed joint shown in (2) of FIG. The surface of the sealing material after curing is usually slightly depressed due to spatula finishing and solvent volatilization.
FIG. 3 is an example in which a hat joiner 6 made of an open-cell foamed molded product is used, and FIG. 4 is made of an open-cell foamed molded product at a joint provided at the butt portion between the siding member 2 and the sash circumference 8. This is an example in which a joint base is formed by using a round bar-shaped backup material 7, and the joint is filled with a sealing material 5 and cured to form a sealed joint. In FIG. 4, the siding member 2 is screwed to the trunk edge 20 attached to the column 21, and the illustration of this screw is omitted.
In FIG. 1, open cells having air permeability are indicated by black dots, but a part A of the open cell foamed molded body of FIG. 1 is enlarged to schematically show the state of continuous open cells. This is A in FIG. In FIG. 2, white portions indicate bubbles. The same applies to FIGS. 3 and 4 and FIGS. 6 to 9 described later.
The backup material 4 or 7 or the hat joiner 6 forms the bottom of the joint and is used for the purpose of adjusting the depth D of the joint. In the present invention, the material used for forming the joint bottom is aeration. The air-permeable open-cell foamed molded product is used as a molded product having the property, and the air-permeable open-cell foamed molded product has a direction in which the air-permeable surface is in contact with the sealing material. Loaded. By adopting such a configuration, the bottom surface of the sealing material opposite to the surface that is open to the atmosphere comes into contact with the air-permeable surface of the molded body. ) And oxygen can be supplied.
In the present invention, the back-up material, the hat joiner, and the bond breaker described later are part names of the molded body forming the joint bottom.

More specifically, when the joint is filled with a sealing material that cures from the surface in contact with the atmosphere, such as a one-component moisture-curing urethane-based sealing material, the atmosphere of the sealing material Curing progresses from the open surface by moisture (humidity) in the atmosphere, and moisture in the atmosphere is also supplied by ventilation from the boundary surface that contacts the surface of the open cell foam that becomes the bottom of the sealing material. Accordingly, curing proceeds from the bottom surface of the sealing material. Therefore, the curing progresses more uniformly as a whole sealing material, and during the curing of the sealing material, due to fluctuations in the joint width direction due to shrinkage and expansion of the siding member (this is also referred to as movement in the joint width direction), Even if the sealing material is displaced, the cured sealing material becomes a cured material that is substantially free of damage such as cracks and wrinkles on the surface. It is a sealing method that can form a sealed joint of a building composed of a joint bottom and a cured sealing material, and has good movement followability during curing. Here, it is preferable that the curing rate from the surface side of the sealing material opened to the atmosphere and the curing rate from the bottom side are substantially the same. “Approximately the same” means that the thickness of the cured film cured from the bottom side is 50% or more, more than 70%, particularly 80% or more of the thickness of the cured film cured from the surface side. Means preferred.
In the present invention, “substantially no damage” means that there are small bubbles or small bubbles on the surface of the cured product, depending on the filling of the sealing material, construction method, or curing conditions. This means that it is not damage that leads to accidents such as water leakage over a long period of time.

Next, the breathable open-cell foamed molded product used in the present invention will be described.
Specifically, the open-cell foamed molded article is made of a synthetic resin or a synthetic rubber that is foamed by using a foaming agent or the like to form a large number of bubbles, and achieves the object of the present invention. In addition, it is necessary that the bubbles are continuous open cells and have air permeability. Examples of the type include a so-called joiner represented by the above-described hat joiner or a backup material.
The joiner is used not only to adjust the joint depth as described above, but also to facilitate the work of attaching the siding members so that the joint width is constant, as shown in FIG. The shape is a typical one. As shown in FIGS. 3 and 8, the entire joiner may be made of open-cell foam, or as shown in FIG. 9, only the portion 12 in contact with the sealant serving as the joint base of the joiner is open-cell. The other portions 13 and 14 may be made of a non-foamed material such as a steel plate or polypropylene.
As described above, the backup material is used for the purpose of forming a joint bottom by inserting the joint into the joint so that the joint has a predetermined depth, and the shape thereof is a flat plate as shown in FIG. 1 and FIG. In addition to the round bar shape shown in FIG. 4 and FIG. 7, various shapes such as a semicircular bar shape, a square bar shape, and a string shape are included. The synthetic resin as the material of the open-cell foamed molded article may be either thermosetting or thermoplastic. For example, polyurethane resin, polyethylene resin, polypropylene resin, fluorine resin, polyester resin, acrylic resin, vinyl chloride resin, phenol Various types of resins are exemplified, and examples of the synthetic rubber as a material include EPDM rubber, butyl rubber, chloroprene rubber, SBR, NBR, and silicone rubber.
In addition to the breathable open-cell foamed molded product, the backup material and the joiner are those in which a large number of holes are physically drilled with a tool such as a needle in the molded product such as the synthetic resin. There are various types such as pipes made of synthetic resin that have been gathered together and molded by adhesive or heat fusion, etc., and granules such as synthetic resin or inorganic substances gathered together and solidified by adhesive or heat. An open-cell foamed molded article having air permeability is preferable because it can be manufactured at low cost and is easy to use.
In addition, it is preferable that the surface used as a joint base, such as a backup material and a joiner, has a property which a sealing material does not adhere | attach. This will be explained with reference to FIG. 1. When the sealing material is bonded to the three surfaces of the surfaces 2a, 3a and 4a (so-called three-surface bonding), the stress concentrates on the corners of the three surfaces when the joint is displaced. This is to prevent breakage and cohesive failure. The non-adhesive property may be that the material itself is non-adhesive, or the surface in contact with the sealing material may be subjected to a release treatment with a silicone release agent or the like. The backup material or the joiner may be properly used depending on the joint design.

Next, a sealing method using an air-permeable adhesive preventing member as the air-permeable molded body will be described with reference to FIG.
FIG. 5 is an example of a joint joint formed by combining the end side of the siding 9 formed into a male mold and the end of the siding 10 formed into a female mold. A tape-like breathable anti-adhesion member 11 is attached to the bottom portion of the joint so that the air-permeable surface is in contact with the sealing material to form the joint bottom. Next, a primer is applied to the surfaces 9a and 10a, which become adherend surfaces when filled with a sealing material, with a brush or the like. After being left for a predetermined time, the atmosphere surrounded by the three surfaces of the surfaces 9a and 10a and the joint surface 11a Fill with an elastic sealing material that hardens from the surface that touches the surface, scrape off the excess sealing material that protrudes from the joint with a spatula, flatten the surface, and cure to form a sealed joint (sealing method) .
This adhesion preventing member 11 is also called a bond breaker, and is a porous thin film made of various synthetic resins and fibers similar to those mentioned as materials for the backup material such as a fluororesin-based porous thin film material (trade name Gore-Tex). Examples thereof include a material, a woven fabric or a non-woven fabric, or a film-like material made of an open-cell foam, and the shape is preferably a tape. The surface 11a of the adhesion preventing member 11 needs to have a property that the sealing material 5 that comes into contact does not adhere. This non-adhesive property may be that the material itself may be non-adhesive. The contacting surface may be subjected to a release treatment with a silicone release agent or the like.

Next, the sealing material used in the present invention will be described.
As described above, the sealant is a one-part curable sealant that cures from the surface that comes into contact with air. There is no need to mix the main agent and the curing agent, and there is no problem of poor curing due to poor mixing. Preferred examples include the favorable point and the point that the effect of the sealing method of the present invention can be maximized. Of course, it is also possible to use a two-component curable sealing material in which the main agent and the curing agent are mixed and cured. is there.
Examples of the one-component curable sealing material include a modified polysulfide-based one-component oxygen curable sealing material that cures by contacting with oxygen in the air, and by contacting with moisture (humidity) in the air. One-component moisture-curing type sealing materials that progress in curing can be mentioned. Among these, one-component moisture-curing type sealing materials are preferred because they are easy to use, have low modulus, high elongation, and excellent rubber elasticity.

  Specific examples of the one-component moisture-curable sealing material include one-component moisture-curable urethane-based sealing materials, modified silicone-based sealing materials, silicone-based sealing materials, and polysulfide-based sealing materials. Of these, urethane-based sealing materials, modified silicone-based sealing materials, and silicone-based sealing materials are preferred because they have excellent workability, low modulus after curing, high elongation, excellent adhesion, and weather resistance. A urethane-based sealing material and a modified silicone-based sealing material are preferable in terms of excellent curability and low surface contamination.

The one-component moisture curable urethane-based sealing material contains an isocyanate group-containing urethane prepolymer as a curing component, and is blended with various additives described later to form a sealing material. The isocyanate group-containing urethane prepolymer is a compound in which an isocyanate group reacts with moisture (water) to form a urea bond to crosslink and cure, and an active hydrogen compound and an organic isocyanate are combined with the active hydrogen (group). When an alcoholic hydroxyl group-containing compound is used under an excess of isocyanate groups or as an active hydrogen compound, those obtained by reacting with hydroxyl groups under an excess of isocyanate groups are preferred.
More specifically, an active hydrogen compound (particularly an alcoholic hydroxyl group-containing compound) and an organic isocyanate have an isocyanate group / active hydrogen (group) (particularly hydroxyl group) equivalent ratio of 1.1 to 10 / 1.0, particularly It can be preferably produced by reacting simultaneously or sequentially within a range of 1.3 to 2.5 / 1.0. When the equivalent ratio is less than 1.1 / 1.0, the viscosity of the resulting urethane prepolymer becomes too high, resulting in a risk of gelation. When the equivalent ratio exceeds 10 / 1.0, the isocyanate group becomes damp. This is not preferable because the amount of carbon dioxide gas generated by the reaction with a large amount causes foaming.

Examples of the active hydrogen compound include polyols, amino alcohols, and polyamines.
The polyol includes a low molecular weight polyol and a high molecular weight polyol, and among these, a high molecular weight polyol is preferable. Examples of the polymer polyol include polyoxyalkylene polyols, polyester polyols, polyester amide polyols, polyether / ester polyols, polycarbonate polyols, poly (meth) acrylic polyols, hydrocarbon polyols, and the like. The number average molecular weight is 500 or more. , Preferably 1,000 or more.
Examples of the polyoxyalkylene-based polyol include those obtained by ring-opening addition polymerization of alkylene oxide, and those obtained by ring-opening addition polymerization of alkylene oxide in an initiator such as a compound containing two or more active hydrogens.
Examples of the initiator include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, neopentyl glycol, 1,4-butanediol, 1,6-hexanediol, glycerin, trimethylolpropane, pentaerythritol, diglycerin and the like. Low molecular weight polyhydric alcohols, sorbitol, sucrose, glucose, lactose, low molecular weight polyhydric alcohols such as glucose, lactose, sorbitan, low molecular weight polyphenols such as bisphenol A and bisphenol F, low molecular weight such as ethylenediamine and butylenediamine Polyamines, low molecular amino alcohols such as monoethanolamine and diethanolamine, low molecular polycarboxylic acids such as adipic acid and terephthalic acid, and at least one of these is alkylene oxide Polyoxyalkylene polyol having a low molecular weight below the molecular weight of 500 obtained by reacting the like.
Examples of the alkylene oxide include ethylene oxide, propylene oxide, butylene oxide, and tetrahydrofuran.
Specifically, polyoxyalkylene polyols are specifically polyoxyethylene polyols, polyoxypropylene polyols, polyoxybutylene polyols, polytetramethylene ether polyols, poly (oxyethylene) -poly (oxypropylene). -Random or block copolymer polyols, poly (oxypropylene)-poly (oxybutylene)-random or block copolymer polyols, etc., and these various polyols and organic isocyanates can be used as isocyanate groups. On the other hand, there may be mentioned those having a hydroxyl group at the molecular end by reacting with an excess of hydroxyl groups.
From the viewpoint of workability, the polyoxyalkylene polyol preferably has a number average molecular weight of 500 to 100,000, more preferably 1,000 to 30,000, particularly 1,000 to 20,000, and one molecule. The average number of alcoholic hydroxyl groups per hit is 2 or more, more preferably 2 to 4, and most preferably 2 to 3.
Furthermore, polyoxyalkylene-based polyols can be used in the production of cesium-based compounds (cesium hydride, cesium methoxide, cesium alkoxides such as cesium alkoxide, cesium hydroxide, etc.), diethyl zinc, iron chloride, metals. Porphyrin, phosphazenium compound, complex metal cyanide complex, etc., obtained by using complex metal cyanide complex such as glyme complex or diglyme complex of zinc hexacyanocobaltate among others, total unsaturation is 0.1 meq / g or less, Further, 0.07 meq / g or less, particularly 0.04 meq / g or less is preferable, and molecular weight distribution [of weight average molecular weight (Mw) and number average molecular weight (Mn) in terms of polystyrene by gel permeation chromatography (GPC)]. Ratio = Mw / Mn] is 1.6 or less, especially A narrow one of 0.0 to 1.3 can lower the viscosity of the resulting isocyanate group-containing urethane prepolymer, and the rubber elastic properties after curing are good, and the one-component moisture-curing urethane-based sealing obtained therefrom This is preferable in that the movement followability during the curing of the material is good.
Examples of polyester polyols and polyester amide polyols include, for example, known dicarboxylic acids such as succinic acid, adipic acid, and terephthalic acid, their acid esters, acid anhydrides, and the like, and initiators for the synthesis of the above polyoxyalkylene polyols. Examples thereof include compounds obtained by a dehydration condensation reaction with a compound containing two or more active hydrogens to be used. Further examples include lactone polyester polyols obtained by cleavage polymerization of cyclic ester (ie, lactone) monomers such as ε-caprolactone.
Examples of the polyether ester polyol include compounds produced from the polyoxyalkylene polyol and the dicarboxylic acid, acid anhydride and the like.
Examples of the polycarbonate polyol include a dehydrochlorination reaction between low molecular polyhydric alcohols used for the production of the polyoxyalkylene polyol and phosgene, or transesterification with diethylene carbonate, dimethyl carbonate, diethyl carbonate, diphenyl carbonate, and the like. The compound obtained from reaction etc. is mentioned.
Examples of the poly (meth) acrylic polyol include those obtained by copolymerizing hydroxyethyl (meth) acrylate containing a hydroxyl group with other (meth) acrylic acid alkyl ester monomers.
Examples of the hydrocarbon-based polyol include polybutadiene polyol, hydrogenated polybutadiene polyol, polyisoprene polyol, hydrogenated polyisoprene polyol, chlorinated polyethylene polyol, and chlorinated polypropylene polyol.
Examples of the polyol further include low molecular weight polyhydric alcohols having a number average molecular weight of less than 500, which are listed as raw materials for producing the polyoxyalkylene polyol.
Examples of the polyamine include high molecular weight polyamines such as polyoxyalkylene polyamines having a number average molecular weight of 500 or more and polyoxyalkylene polyols having amino groups at the ends, such as terminal diaminated products of polypropylene glycol.
Examples of the polyamine further include low-molecular polyamines having a number average molecular weight of less than 500, such as ethylenediamine, hexamethylenediamine, isophoronediamine, diaminodiphenylmethane, and diethylenetriamine.
Examples of amino alcohols include monoethanolamine, diethanolamine, N-methyldiethanolamine, N-methyldipropanolamine, and N-phenyldiethanolamine.
Any of these may be used alone or in combination of two or more.
Among these, since the viscosity of the isocyanate group-containing urethane prepolymer obtained is low and the internal curability is good, the viscosity of the one-part moisture curable urethane-based sealing material composition obtained therefrom is low and the work is good. In terms of good movement followability during curing, polymeric polyols are preferred, polyoxyalkylene polyols are more preferred, and polyoxypropylene polyols are particularly preferred.
As the active hydrogen compound, a monool compound may optionally be used for modifying the isocyanate group-containing urethane prepolymer. As the monool compound, in addition to low-molecular monoalcohols such as methyl alcohol, ethyl alcohol, and propyl alcohol, these low-molecular monoalcohols were used as initiators to carry out ring-opening addition polymerization of alkylene oxides such as propylene oxide. The compound similar to the polyoxyalkylene type monool used for the synthesis | combination of the below-mentioned liquid polyoxyalkylene type urethane resin is mentioned. Of these, polyoxypropylene monools are preferred.
The polyoxyalkylene polyol is 50% by mass or more of the portion excluding the hydroxyl group in 1 mol of the molecule, more preferably 80% by mass or more, and particularly preferably 90% by mass or more of polyoxyalkylene. , Which means that the remaining part may be modified with urethane, ester, polycarbonate, polyamide, polyacrylate, polyolefin, etc., but the polyol whose polyoxyalkylene is 95% by mass or more of the part excluding the hydroxyl group is the most. preferable.

Specific examples of the organic isocyanate include organic polyisocyanate and organic monoisocyanate that is optionally used for modifying an isocyanate group-containing urethane prepolymer.
The organic polyisocyanate is a compound containing two or more isocyanate groups in the molecule. Specifically, for example, toluene diisocyanates such as 2,4-toluene diisocyanate and 2,6-toluene diisocyanate, 4,4′- Diphenylmethane diisocyanate, 2,4′-diphenylmethane diisocyanate, diphenylmethane diisocyanates such as 2,2′-diphenylmethane diisocyanate, phenylene diisocyanates such as 1,2-phenylene diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, 2,4,6-trimethylphenyl-1,3-diisocyanate, 2,4,6-triisopropylphenyl-1,3-diisocyanate, 1,4-naphthalene diisocyanate, Naphthalene diisocyanates such as 1,5-naphthalene diisocyanate, chlorophenylene-2,4-diisocyanate, 4,4'-diphenyl ether diisocyanate, 3,3'-dimethyldiphenylmethane-4,4'-diisocyanate, 3,3'-dimethoxydiphenyl Aromatic polyisocyanates such as -4,4'-diisocyanate, 1,6-hexamethylene diisocyanate, 1,4-tetramethylene diisocyanate, 2,2,4-trimethyl-1,6-hexamethylene diisocyanate, 2,4,4 Aliphatic polyisocyanates such as 4-trimethyl-1,6-hexamethylene diisocyanate, decamethylene diisocyanate, lysine diisocyanate, o-xylylene diisocyanate, m-xylylene diisocyanate Alicyclic polyisocyanates such as xylylene diisocyanates such as p-xylylene diisocyanate, 1,4-cyclohexyl diisocyanate, isophorone diisocyanate, hydrogenated toluene diisocyanate, hydrogenated xylylene diisocyanate, hydrogenated diphenylmethane diisocyanate and the like Isocyanates. Furthermore, organic polyisocyanates such as polymethylene polyphenyl polyisocyanate and crude toluene diisocyanate can also be used. In addition, modified isocyanates containing one or more uretdione bonds, isocyanurate bonds, allophanate bonds, burette bonds, uretonimine bonds, carbodiimide bonds, urethane bonds, urea bonds and the like obtained by modifying these organic polyisocyanates can also be used.
These can be used singly or in combination of two or more, but aromatic polyisocyanates and araliphatic polyisocyanates are obtained in that the adhesive property after curing of the obtained one-component urethane sealant composition is good. Diphenylmethane diisocyanates are preferred, and 4,4'-diphenylmethane diisocyanate is particularly preferred.
Examples of the organic monoisocyanate include n-butyl monoisocyanate, n-hexyl monoisocyanate, n-tetradecyl monoisocyanate, n-hexadecyl monoisocyanate, and octadecyl monoisocyanate. These can be used alone or in combination of two or more.

In the synthesis of the isocyanate group-containing urethane prepolymer, a reaction catalyst similar to the curing acceleration catalyst described later can be used.
Further, a known organic solvent can also be used.
The isocyanate group content of the isocyanate group-containing urethane prepolymer is preferably 0.3 to 15.0 mass%, particularly preferably 0.5 to 5.0 mass%. When the isocyanate group content is less than 0.3% by mass, there are few crosslinking points in the urethane prepolymer, so that sufficient adhesiveness cannot be obtained. When the isocyanate group content exceeds 15.0% by mass, the number of crosslinking points in the urethane prepolymer increases and the rubber elasticity deteriorates, and the amount of carbon dioxide generated by the reaction with moisture increases and the cured product is foamed. This is not preferable.
In the molecular weight distribution measurement by GPC, the isocyanate group-containing urethane prepolymer has a molecular weight distribution (Mw / Mn) of a main peak (a peak having an area exceeding 50% of the peak area) of 1.6 or less, particularly 1.0. The sealing material from which a narrow one of -1.3 is obtained is preferable in that the internal curability is good and the effects of the present invention can be maximized.

（式中、Ｒは炭化水素基であり、炭素数１〜２０のアルキル基、炭素数６〜２０のアリール基又は炭素数７〜２０のアラルキル基が好ましく、メチル基が最も好ましい。Ｘで示される反応性基はハロゲン原子、水素原子、水酸基、アルコキシ基、アシルオキシ基、ケトキシメート基、アミド基、酸アミド基、メルカプト基、アルケニルオキシ基及びアミノオキシ基より選ばれる加水分解性の基であり、Ｘが複数の場合には、Ｘは同じ基であっても異なった基であってもよい。このうちＸはアルコキシ基が好ましく、メトキシ基又はエトキシ基が最も好ましい。ａは０、１又は２の整数であり、０又は１が最も好ましい。） The one-part moisture-curing modified silicone-based sealing material contains a crosslinkable silyl group-containing resin as a curing component, and is blended with various additives described later to form a sealing material. Examples of crosslinkable silyl group-containing resins (also referred to as modified silicone resins) include, for example, JP-A-52-73998, JP-A-55-9669, JP-A-59-122541, and JP-A-60-6747. JP, 61-233043, JP 63-6003, JP 63-112642, JP 3-79627, JP 4-283259, JP 5-5 No. 287186, JP-A-11-80571, JP-A-11-116763, JP-A-11-130931, specifically, a crosslinkable silyl group is contained in the molecule. , Main chain is aliphatic polymer such as vinyl polymer, polyoxyalkylene polymer, polyisoprene, polyisobutylene, polybutanediene, poly Ester-based polymer, polysulfide polymers, copolymers thereof, and mixtures thereof. This crosslinkable silyl group is hydrolyzed and condensed by moisture, and curing proceeds. The crosslinkable silyl group has 0.4 in the molecule from the viewpoint of the curability of the composition and the physical properties after curing. It is preferable to contain at least one, particularly 1.0 to 5.0. Further, the crosslinkable silyl group is preferably one represented by the following general formula which is easily crosslinked and easily produced.

Wherein R is a hydrocarbon group, preferably an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms or an aralkyl group having 7 to 20 carbon atoms, and most preferably a methyl group. The reactive group is a hydrolyzable group selected from a halogen atom, hydrogen atom, hydroxyl group, alkoxy group, acyloxy group, ketoximate group, amide group, acid amide group, mercapto group, alkenyloxy group and aminooxy group, When X is plural, X may be the same group or different groups, among which X is preferably an alkoxy group, most preferably a methoxy group or an ethoxy group, and a is 0, 1, or 2. And is most preferably 0 or 1.)

Introduction of the crosslinkable silyl group into the main chain can be performed, for example, by the following known method.
(A) An organic compound (for example, allyl isocyanate) having an active group and an unsaturated group which are reactive to this functional group in a polymer such as a polyoxyalkylene type or vinyl type having a functional group such as a hydroxyl group at the terminal. Then, the resulting reaction product is hydrosilylated by allowing hydrosilane having a hydrolyzable group to act.
(B) A polyoxyalkylene-based or vinyl-based polymer having a functional group such as a hydroxyl group, an epoxy group or an isocyanate group at the terminal has a functional group and a crosslinkable silyl group that are reactive with the functional group. The compound is reacted.
Examples of the compound having a reactive functional group and a crosslinkable silyl group include amino group-containing silanes, mercapto group-containing silanes, epoxy group-containing silanes, vinyl type unsaturated group-containing silanes, chlorine atom-containing silanes, and isocyanates. Examples thereof include group-containing silanes and hydrosilanes.
(C) A compound having a polymerizable unsaturated bond and a crosslinkable silyl group (for example, CH ₂ ═CHSi (OCH ₃ ) ₃ or CH ₂ ═CHCOO (CH ₂ ) ₂ Si (OCH ₃ ) ₃ ) and (meth) acrylic An acid alkyl ester monomer is copolymerized.
(D) A compound having a polymerizable unsaturated bond and a functional group (for example, hydroxyethyl (meth) acrylate or allyl (meth) acrylate) is added to the (meth) acrylic acid alkyl ester monomer and copolymerized. Then, the resulting copolymer is a compound having a reactive functional group and a crosslinkable silyl group (for example, a compound having an isocyanate group and —Si (OCH ₃ ) ₃ group, trimethoxysilane, triethoxysilane, etc. And hydrosilane having a hydrolyzable group).

Specific examples of commercial products of the crosslinkable silyl group-containing resin include those having a main chain of polyoxypropylene, Kaneka MS polymer S203 and S303, Exastar ES-S2410, ES manufactured by Asahi Glass Co., Ltd. -S2420, ES-S3610, ES-S3620, ES-S3630, and the like. Examples of the main chain that is acrylic-modified polyoxypropylene include Kaneka MS polymer S903, MSX908, MSX911, and the like. .
Moreover, the crosslinkable silyl group containing resin obtained by carrying out the urethanation reaction of the polyol and isocyanate group containing silanes which were mentioned by the synthesis | combination of the above-mentioned isocyanate group containing urethane prepolymer is also mentioned.
The number average molecular weight in terms of polystyrene by GPC of the crosslinkable silyl group-containing resin is 1,000 or more, particularly 6,000 to 30,000, and the molecular weight distribution of the main peak (peak having an area exceeding 50% of the peak area) is The narrow one of 1.6 or less, especially 1.0 to 1.3, is easy to handle because the viscosity of the sealing material is low, has excellent physical properties such as strength, elongation and modulus after curing, and has internal curability. It is preferable in that it is excellent and the effects of the present invention can be maximized.

  The one-part moisture curable silicone-based sealing material contains a silicone resin as a curing component and is blended with various additives described later to form a sealing material. The silicone resin is a resin having a main chain of organopolysiloxane and a crosslinkable silyl group in the molecule.

The one-part moisture-curing polysulfide-based sealing material contains a liquid polysulfide resin as a curing component, and a peroxide of an alkali or an alkali metal such as BaO ₂ and CaO ₂ as a latent curing agent. Further, various additives described later are blended to form a sealing material.

  Examples of the additive to be added to the above-mentioned curing component include a curing acceleration catalyst, a weather resistance stabilizer, a filler, an adhesion imparting agent, a thixotropic imparting agent, a storage stability improving agent (dehydrating agent), and a coloring agent.

The curing accelerating catalyst is added to accelerate the reaction of the various sealing materials with moisture or oxygen to increase the curing speed, and specifically includes organometallic compounds, amines, and the like. As, for example, divalent organic tin compounds such as tin octylate and tin naphthenate, dibutyltin dioctoate, dibutyltin dilaurate, dibutyltin diacetate, dibutyltin dimaleate, dibutyltin distearate, dioctyltin dilaurate, dioctyltin diversate, Dibutyltin oxide, dibutyltin bis (triethoxysilicate), tetravalent organic tin compounds such as reaction products of dibutyltin oxide and phthalates, dibutyltin bis (acetylacetonate), tin-based chelate compounds manufactured by Asahi Glass Co., Ltd. EXCESTAR C-501, Zirconite Various metal chelate compounds such as trakis (acetylacetonate), titanium tetrakis (acetylacetonate), aluminum tris (acetylacetonate), aluminum tris (ethylacetoacetate), acetylacetone iron, acetylacetone copper, acetylacetone bismuth, tetra-n -Titanates such as butyl titanate and tetrapropyl titanate, and other metals other than tin such as manganese, iron, cobalt, copper, zinc, zirconium, lead and bismuth such as lead octylate and zirconium octylate, and octyl Examples thereof include metal organic acid salts with various organic acids such as acid, stearic acid, and naphthenic acid. Examples of amines include triethylamine, tributylamine, triethylenediamine, hexamethylenetetramine, 1, -Tertiary amines such as diazabicyclo [5,4,0] undecene-7 (DBU), 1,4-diazabicyclo [2,2,2] octane (DABCO), N-methylmorpholine, N-ethylmorpholine, Or these amines and salts, such as carboxylic acid, etc. are mentioned.
Of these, organometallic compounds are preferred because of their high reaction rate and relatively low toxicity and volatility, more preferred are organic tin compounds and metal chelate compounds, and particularly preferred is dibutyltin dilaurate.
It is preferable that the curing accelerating catalyst is blended in an amount of 0.001 to 10 parts by mass, particularly 0.01 to 2 parts by mass with respect to 100 parts by mass of the curing component, from the viewpoint of the curing speed and the physical properties of the cured product.

  A weathering stabilizer is used to prevent oxidation, light degradation, and thermal degradation after curing of the sealing material, and to further improve not only the weather resistance but also the heat resistance. Specific examples of the weather resistance stabilizer include an antioxidant, an ultraviolet absorber, and a photocurable compound.

Specific examples of the antioxidant include hindered amine-based and hindered phenol-based antioxidants. Examples of the hindered amine-based antioxidant include bis (1,2,2,6,6-pentamethyl). -4-piperidyl) [[3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl] methyl] butyl malonate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) Examples include sebacate, methyl-1,2,2,6,6-pentamethyl-4-piperidyl sebacate, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine. In addition to Sanyo LS-292, trade names manufactured by Sankyo Co., Ltd., trade names Adeka Stub series LA-52, LA-57, LA-62, LA-67, LA-77, LA- 82, LA-87 and other low molecular weight hindered amine antioxidants with a molecular weight of less than 1,000, also LA-63P, LA-68LD or Ciba Specialty Chemicals' product names CHIMASSORB series 119FL, 2020FDL, 944FD, 944LD And high molecular weight hindered amine antioxidants having a molecular weight of 1,000 or more.
Examples of the hindered phenol antioxidant include pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-). tert-butyl-4-hydroxyphenyl) propionate], N, N′-hexane-1,6-diylbis [3- (3,5-di-tert-butyl-4-hydroxyphenylpropionamide)], benzenepropanoic acid Examples include 3,5-bis (1,1-dimethylethyl) -4-hydroxy C7-C9 side chain alkyl ester, 2,4-dimethyl-6- (1-methylpentadecyl) phenol, and the like.

  Examples of the ultraviolet absorber include benzotriazole-based ultraviolet absorbers such as 2- (3,5-di-tert-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole, and 2- (4,6-diphenyl- 1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol and other triazine UV absorbers, benzophenone UV absorbers such as octabenzone, 2,4-di-tert-butylphenyl Examples include benzoate-based ultraviolet absorbers such as -3,5-di-tert-butyl-4-hydroxybenzoate.

  Examples of the photocurable compound include a compound containing one or more groups that are reactively cured by light such as an acryloyl group or a methacryloyl group in the molecule, and specifically, for example, an isocyanate group-containing urethane resin and a hydroxyl group-containing acrylate compound Polyester acrylate or polyester methacrylate such as urethane acrylate, urethane methacrylate, ester acrylate or ester methacrylate such as trimethylolpropane triacrylate or trimethylolpropane trimethacrylate, acrylate or methacrylate of polyethylene adipate polyol, etc. Polyether acrylate such as ether polyol acrylate or methacrylate, polyether methacrylate, or poly Examples thereof include vinyl cinnamates and azido resins, and monomers and oligomers having a molecular weight of 10,000 or less, and more preferably a molecular weight of 5,000 or less are preferred. Particularly, acryloyl groups and / or methacryloyl groups are averaged per molecule. The thing containing 2 or more is preferable.

  The weathering stabilizer is preferably blended in an amount of 0 to 30 parts by mass, particularly 0.01 to 10 parts by mass with respect to 100 parts by mass of the curing component.

  Fillers, adhesion-imparting agents, thixotropic agents, storage stability improvers (dehydrating agents), colorants, etc. are used for reinforcement and weight gain, improved adhesion, thixotropic properties, improved storage stability, coloring, etc. Can be used for

  As the filler, for example, mica, kaolin, zeolite, graphite, diatomaceous earth, white clay, clay, talc, silicic anhydride, quartz fine powder, aluminum powder, zinc powder, synthetic silica such as precipitated silica, heavy calcium carbonate, Inorganic powder fillers such as light calcium carbonate, magnesium carbonate, and alumina, inorganic fillers such as fiber fillers such as glass fiber and carbon fiber, rubber powder, polyamide resin, polyester resin, polyurethane resin, vinyl chloride resin In addition to organic fillers such as polyolefin resin such as polyethylene and polypropylene, thermoplastic resin such as acrylic resin, epoxy resin, phenol resin or thermosetting resin powder, flame retardant such as magnesium hydroxide and aluminum hydroxide Examples include a property-imparting filler, and a particle size of 0.01 to 1,000. Those of m is preferred.

Examples of the adhesion imparting agent include a coupling agent, an epoxy resin, a phenol resin, an alkyd resin, an alkyl titanate, and an organic polyisocyanate.
Examples of the coupling agent include various coupling agents such as silane, aluminum and zircoaluminate and / or partial hydrolysis condensates thereof. Of these, a silane coupling agent and / or a partially hydrolyzed condensate thereof is preferred because of its excellent adhesiveness.
Examples of the silane coupling agent include 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, vinyltrimethoxysilane, vinyldimethylmethoxysilane, 3-aminopropyltrimethoxysilane, N- (2- Aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-glycidoxypropylmethyldiisopropenoxysilane, 3-glycidoxypropyltriethoxysilane N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltriethoxysila , N-phenyl-3-aminopropyltrimethoxysilane and other low molecular weight compounds having functional groups such as alkoxysilanes and isopropenoxysilanes having a molecular weight of 500 or less, preferably 400 or less, and / or of these silane coupling agents A compound having a molecular weight of 200 to 3,000 may be used as one or more partial hydrolysis condensates.

  The thixotropic agent is used for imparting thixotropic properties so that it does not sag when filled with a sealing material in a vertical joint or the like (for example, colloidal silica, organic surface-treated calcium carbonate). And inorganic thixotropic agents such as organic bentonites, modified polyester polyols, and fatty acid amides. However, in order to promote the internal curing of the sealing material, when using a curing accelerator, which will be described later, depending on the thixotropic agent used, if the curing promoting catalyst coexists, the thixotropic structure is destroyed and the outer wall joint is filled. When it is constructed, it causes a problem that it cannot be constructed due to dripping (slump). In order to prevent this, as the thixotropic agent, organic surface-treated calcium carbonate is preferable.

  Examples of the storage stability improver include low-molecular crosslinkable silyl group-containing compounds such as vinyltrimethoxysilane, calcium oxide, magnesium oxide, p-toluenesulfonyl isocyanate, which react with moisture present in the sealing material. It is done.

  Examples of the colorant include inorganic pigments such as titanium oxide and iron oxide, organic pigments such as copper phthalocyanine, and carbon black.

  The total amount of the filler, the adhesiveness imparting agent, the thixotropic imparting agent, the storage stability improving agent (dehydrating agent) and the colorant is 1 to 500 parts by mass, and further 10 to 300 parts per 100 parts by mass of the curing component. Part by mass, particularly 10 to 200 parts by mass is preferred.

  Each said additive component can be used individually or in combination of 2 or more types, respectively.

An organic solvent can be further blended for the purpose of lowering the viscosity of the various sealing materials and improving workability. However, with the recent increase in environmental conservation awareness, it is preferable to suppress the amount used as much as possible. It is preferable to use so that it may become less than 10 mass%.
The organic solvent may be any as long as it is inert with respect to a functional group such as an isocyanate group or a crosslinkable silyl group. For example, a ketone solvent such as acetone or methyl ethyl ketone, an ethyl acetate or butyl acetate, etc. Conventional solvents such as ester solvents, aliphatic solvents such as n-hexane, alicyclic solvents such as cyclohexane, aromatic solvents such as toluene and xylene, petroleum fraction solvents such as mineral spirits and industrial gasoline, etc. A solvent is mentioned.

Since the various sealing materials are used for filling and applying to siding joints, the plasticizer migrates (bleeds) to the surface of the cured sealing material, and gives dust to the surface of the cured material by providing adhesiveness. Since it adheres and causes surface contamination, it is preferable not to mix it with the sealing material as much as possible, but it can also be used as long as the object of the present invention is not impaired.
Examples of the plasticizer include phthalic acid esters such as dioctyl phthalate, dibutyl phthalate and butyl benzyl phthalate, dicarboxylic acid adipate, diisodecyl succinate, dibutyl sebacate and butyl oleate, Esters of polyhydric alcohols such as pentaerythritol acetates, phosphate esters such as trioctyl phosphate and tricresyl phosphate, paraffinic hydrocarbons such as chlorinated paraffin, polybutadiene, butadiene-acrylonitrile copolymer, poly Examples thereof include olefin polymers such as chloroprene, polyisoprene, and hydrogenated polybutene.

As a method for producing the sealing material, for example, in a stirring vessel such as an iron or stainless steel kneader or a planetary mixer, one kind of curing components such as the above-mentioned isocyanate group-containing urethane prepolymer and the above-mentioned addition An agent appropriately selected according to the required performance is charged, and the mixture is stirred and mixed in a state where moisture is shut off, such as in a nitrogen gas stream, and the mixture is made uniform, and then depressurized and defoamed to prepare a sealing material.
Since the obtained sealing material thickens and hardens upon contact with moisture, it is preferably stored in a container that can block moisture, sealed and stored in order to maintain the storage stability of the contents. The container may be anything as long as it can block moisture, and examples include various kinds of containers such as drum cans, metal or synthetic resin pail cans and bag-like containers, and paper or synthetic resin cartridge-like containers. .

Next, the sealing method of the present invention will be described.
In the sealing method of the present invention, first, for example, a siding joint portion having at least one of the above-described sidings is cleaned using a brush or cloth. Next, the joint material is formed by filling the joint with a back-up material or a hat joiner as a molded article having air permeability described above, or an adhesion preventing member (bond breaker) as a molded article having air permeability is provided at the bottom of the joint. A joint joint is formed by sticking to the part. The hat joiner is loaded when the siding is set. Next, a masking tape is applied to the surface of the siding along the joint, and a predetermined primer is applied to the adherend surface of the joint using a brush or the like, and a sealing material is placed on the siding joint (filling and construction). Get ready. Next, after taking the primer drying time for a predetermined time, the sealing material that hardens from the surface that comes in contact with the air packed in the sealed container prepared in advance is opened, and the gun is extruded manually, electrically or pneumatically, etc. Installed on the prepared siding joint, scraped off the excess sealing material with a spatula, etc. to flatten the surface, and then quickly removed the masking tape and cured, so that the joint could be removed during curing. The sealing method which forms the hardened | cured material which is not substantially damaged even if it fluctuates, and forms the waterproof sealing joint which does not have a fear of causing a water leak accident can be mentioned suitably.
The sealing method of the present invention is particularly effective for joints formed by siding with large shrinkage.

  Hereinafter, the present invention will be described in more detail with reference to examples.

Example 1
As a one-part moisture curable sealing material, a one-part moisture curable urethane sealant (manufactured by Auto Chemical Industry Co., Ltd., auton siding sealant, GPC of isocyanate group-containing urethane prepolymer has a main peak molecular weight distribution of 1.6 or less) , OP-2531 manufactured by Auto Chemical Co., Ltd. was used as a primer, and as a molded body forming the joint base, a backup material made of polyurethane resin open-cell foam having air permeability (manufactured by Saint-Gobain, thermal bond V-2112, width 12 mm × thickness 10 mm), the following movement followability test and the deep curability test described below were performed. The results are shown in Table 1.

Example 2
In Example 1, as a one-component moisture-curing sealant, a one-component moisture-curing modified silicone sealant (manufactured by Cemedine, POS seal LM, GPC of a crosslinkable silyl group-containing resin has a main peak molecular weight distribution of 1. 6 or less) and a dedicated primer (MP-1000) were used, and a movement followability test and a deep curability test during curing were performed in the same manner. The results are shown in Table 1.

Example 3
In Example 1, curing was carried out in the same manner except that a one-component moisture-curing silicone sealant (manufactured by Shin-Etsu Chemical Co., Ltd., sealant 45) and a dedicated primer (primer MT) were used as the one-component moisture-curing sealing material. An intermediate movement follow-up test and a deep-curing test were performed. The results are shown in Table 1.

Example 4
As a one-part moisture curable sealing material, a one-part moisture curable urethane sealant (manufactured by Auto Chemical Industry Co., Ltd., auton siding sealant, GPC of isocyanate group-containing urethane prepolymer has a main peak molecular weight distribution of 1.6 or less) , OP-2531 manufactured by Auto Chemical Industry Co., Ltd. is used as a primer, and an air-permeable fluororesin porous thin film (tape-shaped) adhesive prevention member (Japan Gore-Tex, Pillar No. 3330, width 10 mm), and the following movement followability test (use of siding with 12 mm thick lap type mating joint specifications) and deep hardenability test were performed. The results are shown in Table 1.

Comparative Example 1
In Example 1, as a material for forming the joint bottom, a backup material made of a non-breathable or non-breathable polyethylene closed cell foam (manufactured by Koei Processing Co., Ltd., pack backer, width 12 mm, thickness 10 mm) was used. In the same manner, a movement follow-up test during curing and a deep-curing test were performed. The results are shown in Table 2.

Comparative Example 2
In Example 1, as a one-part moisture-curing type sealing material, a one-part moisture-curing type silicone sealant (manufactured by Shin-Etsu Chemical Co., Ltd., sealant 45) and a dedicated primer (primer MT) are used as a material for forming a joint base. A movement follow-up test during curing in the same manner except that a back-up material (made by Koei Processing Co., Ltd., pack backer, width 12 mm, thickness 10 mm) made of non-breathable or hardly breathable polyethylene closed cell foam was used. And a deep curing test. The results are shown in Table 2.

〔performance test〕
One-component moisture-curing urethane-based sealing material in Example 1, one-component moisture-curing modified silicone-based sealing material in Example 2, one-component moisture-curing silicone-based sealing material in Example 3, one-component in Example 4 The following tests were conducted using the moisture-curable urethane-based sealing material, the one-component moisture-curable urethane-based sealing material in Comparative Example 1 and the one-component moisture-curable silicone-based sealing material in Comparative Example 2, respectively.
(1) Movement followability test in the middle of curing JIS A 1439 (1997) “Testing method of sealing material for building”, 4.11 of 4.11 durability test A scale that can be set to enlargement / reduction cycles of 1 to 14 or 400 cycles per day is used as a repetitive testing machine. The expansion / reduction displacement cycle is 1 cycle per day, and the displacement width is ± 10% of the joint width. It set so that it might become.
Next, for Examples 1 to 3 and Comparative Examples 1 and 2, siding with a thickness of 24 mm (manufactured by Nichiha Co., Moen Xcellade) was cut out, and an adherend with a thickness of 24 mm × vertical 50 mm × horizontal 50 mm was prepared, This was fixed to each of the fixed part and the movable part of the testing machine so that the facets face each other so that the movement of the testing machine was transmitted to the joint made by siding. A back-up material (width 12 mm × thickness 10 mm × length 50 mm) is mounted on the small face of one adherend so that the joint depth is 12 mm, the joint bottom is formed, and the other adherend is brought closer to the joint. A joint was prepared by fixing the width to 12 mm. Therefore, the shape of the joint at this time was 12 mm wide × 12 mm deep × 50 mm long, and the enlargement and reduction displacements were each 1.2 mm.
In addition, for Example 4, a 12 mm thick mating joint specification siding (manufactured by Nichiha Co., Moen Siding W) was cut out to produce an adherend having a thickness of 12 mm × length 50 mm × width 50 mm. Fix each of the tester's fixed part and movable part one by one so that the mating surfaces are combined, and attach a tape-like anti-adhesive member (bond breaker) to the bottom part of the joint. Formed. The shape of the joint at this time was 10 mm wide × 6 mm deep × 50 mm long, and the expansion and contraction displacements were each 1.0 mm.
Next, apply a masking tape along the joint, apply a specified primer, and take an open time of around 30 minutes, then fill with a one-component moisture-curing type sealing material so that no air bubbles enter, and extra sealing The material was scraped off with a spatula and the masking tape was quickly removed to give a test specimen. After removing the masking tape, the tester was immediately operated and cured while applying a movement under the condition of 1 cycle / day in the order of reduction and enlargement of joints. At this time, the ambient temperature was 23 ° C. and 50% relative humidity. Discontinuation of deformation repeated during curing in 3 cycles (3 days), carefully removed from the tester so that the joint width does not move, and then post-cured for 7 days under the conditions of 35 ° C. and 70% relative humidity. . Next, the cured sealant was cut off from the adherend, and the vicinity of the center was cut at right angles to the length direction. The damage state of the cross section was visually observed and evaluated according to the following criteria.
〔Evaluation criteria〕
○: A state in which damage that adversely affects waterproofing is hardly observed.
(Triangle | delta): The state in which the damage which has a bad influence on waterproofing is recognized a little.
X: A state in which many damages adversely affecting waterproofing are observed.
(Here, damage that has an adverse effect on waterproofing refers to cracks and cavities inside the cured product, dents and bumps on the cured product surface, etc.)
(2) Deep Curability Test A back-up material made of an open-cell foam having a thickness of 10 mm for Examples 1 to 3 is formed on the bottom surface by combining polypropylene plates having a thickness of 2 to 3 mm without moisture permeability. For Example 4, an adhesion preventing member (bond breaker) made of a porous thin film material was applied, and for Comparative Examples 1 and 2, a back-up material made of a closed cell foam having a thickness of 10 mm was stretched to form a bottom portion. A rectangular parallelepiped space having a length of 100 mm, a width of 40 mm, and a depth of 40 mm was produced. This space was filled with a one-component moisture-curing type sealing material, and the excess sealing material was scraped flat with a spatula and cured and cured under an atmosphere of 23 ° C. and 50% relative humidity. 24 hours, 48 hours and 72 hours after filling, after cutting off at right angles to the length direction, removing the uncured part, the thickness (mm) of the film cured from the surface side and from the bottom side, respectively. It was measured.

In this invention, it is sectional drawing which shows an example which formed the joint bottom in the siding joint with the backup material which consists of a breathable open-cell foaming molding. FIG. 2 is a cross-sectional view schematically showing a partially enlarged state of the breathable open cell in FIG. 1. In this invention, it is sectional drawing which shows an example which formed the joint bottom in the siding joint with the hat joiner which consists of an open-cell foaming molding. In this invention, it is sectional drawing which shows an example which formed the joint bottom in the joint formed between the siding member and the sash member with the backup material which consists of an open cell foaming molding. In this invention, it is sectional drawing which shows an example which affixed the bond breaker to the joint joint of the siding and formed the joint bottom. It is a perspective view which shows a part of flat backup material which consists of an open-cell foaming molding in this invention. It is a perspective view which shows a part of round bar-shaped backup material which consists of an open-cell foaming molding in this invention. It is a perspective view which shows a part of hat-joiner which consists entirely of an open-cell foaming molding in this invention. It is a perspective view which shows a part of hat-joiner in which the surface which contacts a sealing material in this invention consists of an open-cell foaming molding. It is sectional drawing which shows the example which formed the joint base with the backup material which consists of the conventional closed cell foaming molding which does not have air permeability.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint 2, 3 Siding 2a, 3a Adhering surface of siding 4 Flat backup material which consists of a breathable open-cell foaming molding 4a The surface which contacts the sealing material of flat backup material 5 Sealing material hardened material 6 All are continuous Hat joiner made of cellular foam molded body 7 Round bar-shaped backup material 8 Sash portion 9 Siding with end formed into male mold 10 Siding with end formed into female mold 9a, 10a Siding surface 11 Bond breaker 11a The surface of the bond breaker that comes into contact with the sealing material. 12 The surface that comes into contact with the sealing material is a hat joy made of an open-cell foamed molded product.
14, 14, 14, 14, 14, 14, 14, 14, 13, 14, each of which is in contact with the sealing material is made of an open cell foamed molded product
The collar part 15 of the back 15 The backup material which consists of the conventional closed cell foaming molding which does not have air permeability 20 Trunk edge 21 Pillar

Claims (12)

  A sealing method comprising filling a sealing material into a siding joint having a joint base made of a breathable molded body and curing the sealing material.   The sealing method according to claim 1, wherein the breathable molded body is a breathable open-cell foamed molded body.   The sealing method according to claim 1, wherein the breathable molded body is a breathable adhesion preventing member.   The sealing method according to claim 1, wherein the breathable molded body is a breathable backup material.   The sealing method according to claim 1, wherein the breathable molded body is a breathable joiner.   The sealing method according to any one of claims 1 to 5, wherein the air-permeable surface of the air-permeable molded body forms a joint bottom in a direction in contact with the sealing material.   The sealing method according to claim 2, wherein the breathable open-cell foamed molded product is a polyurethane-based open-cell foamed molded product.   The sealing method according to any one of claims 1 to 7, wherein the sealing material is a sealing material that cures from a surface in contact with air.   The sealing method according to claim 8, wherein the sealing material that cures from the surface in contact with the air is a one-component moisture-curing urethane-based sealing material.   The sealing method according to claim 8, wherein the sealing material that cures from the surface in contact with the atmosphere is a one-component moisture-curing modified silicone-based sealing material.   The sealing method according to claim 8, wherein the sealing material that cures from the surface in contact with the air is a one-part moisture-curing silicone-based sealing material.   The sealing method according to any one of claims 1 to 11, wherein a curing rate from the surface side opened to the atmosphere of the sealing material is substantially the same as a curing rate from the bottom surface side.

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