JP2019189701A - Building having wall construction - Google Patents

Abstract

To provide a building having wall construction using a precast reinforced concrete wall, in which a sealant used for the building is a sealant other than silicone sealant, has excellent elongation characteristics and restorability, and is excellent in adhesiveness to concrete, and does not contaminate the concrete.SOLUTION: The building having wall construction and using a precast reinforced concrete wall is provided in which a sealant used for joint between walls is the following one-component type sealant containing: an oxyalkylene polymer (A) having a hydroxyl group or a hydrolyzable group bound to a silicon atom, and a silicon-containing group capable of being crosslinked by forming a siloxane bond; an alkoxysilane compound (B) generating an amine compound having at least one alkoxysilane group in a molecule by reaction with water; (C) a tetravalent tin compound; (D) a (meth)acrylic acid ester polymer plasticizer; and (E) a compound having an epoxy group in a molecule.SELECTED DRAWING: None

Description

  The present invention relates to a building having a wall structure using precast concrete.

  The wall-type structure in a building is constructed with a load-bearing wall and a slab (such as a floor slab or roof slab) as the basic components, unlike a structure with columns and beams as in the case of a ramen structure. is there. Since a building having a wall structure is a box-shaped structure that supports a load on its surface, it is strong and excellent in earthquake resistance, and has high confidentiality and heat insulation.

  A reinforced concrete building (RC building) having a wall structure is also known, and a reinforced concrete building having a wall structure using precast reinforced concrete as a component of the wall is also known. When precast reinforced concrete is used, since many processes can be industrialized, it has the advantage that it is possible to shorten the construction period and make the quality of the building uniform.

  Some of the precast reinforced concrete walls used in the wall structure have a width of more than 3 m, and they repeatedly contract and expand as the temperature changes. For this reason, gaps (joints) are provided between the precast reinforced concrete walls to prevent adjacent walls from coming into contact with each other and being damaged. However, if the gap remains, wind and rain may enter the building, and the appearance of the building will be damaged. For this reason, the joint is filled with a sealing material.

  The sealing material must have a rubber property that can follow the shrinkage of the joint. Specifically, a large elongation characteristic is necessary so that it does not break when it is stretched. For example, it is necessary that the elongation at break is about 300%. In addition, it is necessary to return to the original length as much as possible (restorability) when the stress is removed after applying stress to deform such as elongation or compression. For example, it is required to maintain a length of 80% or more of the original length when the stress is removed. Furthermore, it is necessary that the adhesiveness to the concrete is large.

  As a sealing material having such characteristics, a moisture curable silicone sealing material is known. However, this sealing material has the above required properties and is excellent in ordinary adhesion to concrete, but has a problem of poor adhesion (water-resistant adhesion) in the presence of moisture. is doing. Further, as described in Patent Document 1, the silicone sealing material has a problem that impurities are oozed out from the silicone sealing material into the precast reinforced concrete wall and the concrete surface is contaminated. In particular, when the precast reinforced concrete wall is a concrete wall in which slabs are bonded together, contamination of the slabs is significant.

  Thus, it is a sealant other than the silicone sealant used for buildings having a wall-type structure using precast reinforced concrete walls, and has excellent elongation characteristics and resilience, adhesion to concrete, especially water-resistant adhesion There is a need for a sealing material that is excellent in properties and that does not contaminate concrete, in particular, concrete to which stone is bonded.

JP 2000-095946 A

  The problem to be solved by the present invention is a building having a wall-type structure using a precast reinforced concrete wall, and the sealing material used in this building is a sealing material other than a silicone sealing material, and has excellent elongation characteristics. An object of the present invention is to provide a building which is a sealing material which has a resilience, has excellent adhesion to concrete, particularly water-resistant adhesion, and does not contaminate concrete, particularly concrete to which stone is bonded.

  The present inventors have a silicon-containing group having a hydroxyl group or a hydrolyzable group bonded to a silicon atom and capable of crosslinking by forming a siloxane bond (hereinafter, this silicon-containing group is also referred to as a crosslinkable silicon group). It has been found that a sealing material using a specific oxyalkylene polymer and having a specific formulation added solves the above-mentioned problems. That is, the present invention relates to a building having a wall structure using the following precast reinforced concrete walls.

(1) A building having a wall-type structure that uses a precast reinforced concrete wall and the sealing material used for the joint between the walls is the following sealing material.
(A) (A-1) having a hydroxyl group or hydrolyzable group bonded to a silicon atom, having a silicon-containing group that can be cross-linked by forming a siloxane bond, and a polystyrene-equivalent number average by gel permeation chromatography An oxyalkylene polymer having a molecular weight of 20,000 or more is an essential component, and (A-2) has a hydroxyl group or hydrolyzable group bonded to a silicon atom and can be crosslinked by forming a siloxane bond. An oxyalkylene polymer having a group and having a polystyrene-equivalent number average molecular weight of less than 20,000 by gel permeation chromatography is an optional component, and the mass ratio of the component (A-1) to the component (A-2) is It has a hydroxyl group or hydrolyzable group bonded to a silicon atom that is 100: 0 to 100: 100, and forms a siloxane bond. Oxyalkylene polymer 100 parts by weight having a silicon-containing group capable of more crosslinked,
(B) 0.5-20 parts by mass of an alkoxysilane compound that reacts with water to produce an amine compound having at least one alkoxysilyl group in one molecule;
(C) 0.1-10 parts by mass of a tetravalent tin compound,
(D) 10-200 parts by mass of (meth) acrylic acid ester polymer plasticizer,
(E) 0.5 to 20 parts by mass of a compound having an epoxy group in the molecule,
One-component sealant containing
(2) Polystyrene by gel permeation chromatography having a hydroxyl group or hydrolyzable group bonded to the silicon atom as component (A-1), having a silicon-containing group that can be crosslinked by forming a siloxane bond. The oxyalkylene polymer having a reduced number average molecular weight of 20,000 or more has a wall structure as described in (1), which is a polymer obtained by polymerizing alkylene oxide using a double metal cyanide complex catalyst. Building.
(3) Polystyrene by gel permeation chromatography having a hydroxyl group or hydrolyzable group bonded to the silicon atom as component (A-2), having a silicon-containing group that can be crosslinked by forming a siloxane bond. The wall according to (1) or (2), wherein the oxyalkylene polymer having a reduced number average molecular weight of less than 20,000 is a polymer obtained by polymerizing an alkylene oxide using a double metal cyanide complex catalyst. A building with a formula structure.
(4) The wall type according to any one of (1) to (3), wherein the acrylic acid ester polymer plasticizer has a polystyrene-reduced number average molecular weight of 10,000 or less by gel permeation chromatography. Building with structure.
(5) (E) A building having a wall structure according to any one of (1) to (4), wherein the compound having an epoxy group in the molecule is a compound having one epoxy group in the molecule .

  The building having a wall-type structure of the present invention has excellent elongation characteristics and resilience in the sealing material used, and is excellent in adhesion to concrete, in particular water-resistant adhesion, so that sealing is ensured. Concrete, particularly stone It is possible to provide a building having an excellent appearance without contaminating the concrete to which the material is bonded.

  An oxyalkylene polymer having a crosslinkable silicon group as the component (A-1) used in the sealing material of the present invention and having a polystyrene-reduced number average molecular weight of 20,000 or more by gel permeation chromatography is known. It is a polymer.

  The crosslinkable silicon group in the polymer of component (A-1) is a group having a hydroxyl group or a hydrolyzable group bonded to a silicon atom and capable of crosslinking by forming a siloxane bond. As a representative example, the formula (1):

(In the formula, R ¹ represents an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, or R ¹ ₃ SiO— (R ¹ is the same as above), and when two or more R ¹ are present, they may be the same or different, and X is a hydroxyl group or a hydrolyzable group. Represents a group, and when two or more X are present, they may be the same or different, a represents 0, 1, 2 or 3, b represents 0, 1 or 2; And n formulas (2):

B in need not be the same. n shows the integer of 0-19. However, a + (sum of b) ≧ 1 is satisfied. ).

  The hydrolyzable group or hydroxyl group can be bonded to one silicon atom in the range of 1 to 3, and a + (sum of b) is preferably in the range of 1 to 5. When two or more hydrolyzable groups or hydroxyl groups are bonded to the crosslinkable silicon group, they may be the same or different.

  The number of silicon atoms forming the crosslinkable silicon group may be one or two or more, but in the case of silicon atoms linked by a siloxane bond or the like, there may be about 20 silicon atoms. Formula (3):

A crosslinkable silicon group represented by the formula (wherein R ¹ , X and a are the same as described above) is preferable from the viewpoint of easy availability. In the crosslinkable silicon group of the formula (3), a is preferably 2 or 3. When a is 3, the curing rate is higher than when a is 2.

Specific examples of R ¹ include an alkyl group such as a methyl group and an ethyl group, a cycloalkyl group such as a cyclohexyl group, an aryl group such as a phenyl group, an aralkyl group such as a benzyl group, and R ¹ ₃ SiO—. And triorganosiloxy group. Of these, a methyl group is preferred.

  It does not specifically limit as a hydrolysable group shown by said X, What is necessary is just a conventionally well-known hydrolysable group. Specific examples include a hydrogen atom, a halogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, an acid amide group, an aminooxy group, a mercapto group, and an alkenyloxy group. Among these, a hydrogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an amino group, an amide group, an aminooxy group, a mercapto group, and an alkenyloxy group are preferable, and an alkoxy group, an amide group, and an aminooxy group are more preferable. An alkoxy group is particularly preferred from the viewpoint of mild hydrolysis and easy handling. Among the alkoxy groups, those having a smaller number of carbon atoms have higher reactivity, and the reactivity increases as the number of carbon atoms increases in the order of methoxy group> ethoxy group> propoxy group. Although it can be selected according to the purpose and application, a methoxy group or an ethoxy group is usually used. In the case of the crosslinkable silicon group represented by the formula (3), a is preferably 2 or more in consideration of curability.

Specific examples of the crosslinkable silicon group include trialkoxysilyl groups such as a trimethoxysilyl group and a triethoxysilyl group, dialkoxysilyl groups such as —Si (OR) ₃ , a methyldimethoxysilyl group, and a methyldiethoxysilyl group. Group, —SiR ₁ (OR) ₂ . Here, R is an alkyl group such as a methyl group or an ethyl group.

  One type of crosslinkable silicon group may be used, or two or more types may be used in combination. The crosslinkable silicon group can be present in the main chain, the side chain, or both. In view of excellent physical properties of the cured product such as tensile properties of the cured product, a crosslinkable silicon group is preferably present at the molecular chain terminal.

  In the oxyalkylene polymer of the component (A-1), the crosslinkable silicon group should be present in an average of 1.0 to 5 and preferably 1.1 to 3 in one molecule of the polymer. When the number of crosslinkable silicon groups contained in the molecule is less than one, the curability is insufficient, and when the number is too large, the network structure becomes too dense, and good mechanical properties are not exhibited. When the content of the crosslinkable silicon group in the oxyalkylene polymer is moderately reduced, the crosslink density in the cured product is reduced, so that it becomes a more flexible cured product in the initial stage and the modulus characteristics become smaller, and the elongation characteristics at break Becomes larger.

  The (A-1) component oxyalkylene polymer used in the present invention is essentially a polymer having a repeating unit represented by the formula (4).

(Wherein R ² is a divalent organic group)
R ² in Formula (4) is preferably a linear or branched alkylene group having 1 to 14 carbon atoms, and more preferably 2 to 4 carbon atoms.

  Specific examples of the repeating unit represented by the formula (4) include, for example,

Etc. The main chain skeleton of the oxyalkylene polymer may consist of only one type of repeating unit, or may consist of two or more types of repeating units. In particular, it is preferably made of a polymer mainly composed of oxypropylene.

  The molecular weight of the oxyalkylene polymer having a crosslinkable silicon group is preferably larger because the tensile modulus, which is the tensile property of the cured product, is reduced and the elongation at break is increased. In the present invention, the lower limit of the number average molecular weight of the component (A-1) is 20,000. The upper limit of the number average molecular weight is preferably 50,000, and more preferably 40,000. In addition, the number average molecular weight as used in the field of this invention means the polystyrene conversion molecular weight by gel permeation chromatography. When the number average molecular weight is less than 20,000, the tensile modulus or elongation at break may not be sufficient. When the number average molecular weight exceeds 50,000, the viscosity of the composition may increase and workability during construction may decrease.

  The oxyalkylene polymer having a crosslinkable silicon group may be linear or branched. The molecular weight distribution of the oxyalkylene polymer having a crosslinkable silicon group is preferably 2 or less, particularly 1.6 or less.

  Examples of the method for synthesizing oxyalkylene polymers include polymerization methods using an alkali catalyst such as KOH, such as those disclosed in JP-A Nos. 61-197631, 61-215622, 61-215623, and 61-215623. Polymerization methods using organoaluminum-porphyrin complex catalysts obtained by reacting such organoaluminum compounds with porphyrins, such as double metal cyanide complex catalysts shown in, for example, JP-B-46-27250 and JP-B-59-15336 However, the polymerization method is not particularly limited. A polymerization method using a double metal cyanide complex catalyst is preferable because an oxyalkylene polymer having a number average molecular weight of 6,000 or more and a high molecular weight of Mw / Mn of 1.6 or less and a narrow molecular weight distribution can be obtained.

  The main chain skeleton of the polyoxyalkylenes may contain other components such as a urethane bond component. Examples of the urethane bond component include aromatic polyisocyanates such as toluene (tolylene) diisocyanate, diphenylmethane diisocyanate and xylylene diisocyanate; aliphatic polyisocyanates such as isophorone diisocyanate and hexamethylene diisocyanate and polyoxyalkylenes having a hydroxyl group; What can be obtained from this reaction can be mentioned.

  The introduction of a crosslinkable silicon group into an oxyalkylene polymer is reactive to this functional group in an oxyalkylene polymer having a functional group such as an unsaturated group, hydroxyl group, epoxy group or isocyanate group in the molecule. It can be performed by reacting a compound having a functional group having a crosslinkable silicon group. This method (hereinafter referred to as polymer reaction method) is also suitably used for polyester polymers, polyamide polymers, and polymers of unsaturated monomers obtained by living polymerization. This is because these polymers have a functional group such as a hydroxyl group at the end of the molecular chain, and therefore it is easy to introduce a crosslinkable silicon group at the end.

  As a specific example of the polymer reaction method, a hydrosilane or mercapto compound is produced by reacting an unsaturated group-containing oxyalkylene polymer with a hydrosilane having a crosslinkable silicon group or a mercapto compound having a crosslinkable silicon group to form a crosslinkable silicon group. The method of obtaining the oxyalkylene type polymer which has can be mention | raise | lifted. The unsaturated group-containing oxyalkylene polymer has an active group and an unsaturated group which are reactive to the functional group, such as an unsaturated halogen compound, in the oxyalkylene polymer having a functional group such as a hydroxyl group. By reacting an organic compound, an oxyalkylene polymer containing an unsaturated group can be obtained.

  Other specific examples of the polymer reaction method include a method of reacting an oxyalkylene polymer having a hydroxyl group at a terminal with a compound having an isocyanate group and a crosslinkable silicon group, or an oxyalkylene polymer having an isocyanate group at a terminal. And a method of reacting a compound having an active hydrogen group such as a hydroxyl group or an amino group and a crosslinkable silicon group. When an isocyanate compound is used, an oxyalkylene polymer having a crosslinkable silicon group can be easily obtained. The polymer reaction method can be applied to polymers other than oxyalkylene polymers.

  Specific examples of the oxyalkylene polymer having a crosslinkable silicon group include JP-B Nos. 45-36319 and 46-12154, JP-A Nos. 50-156599, 54-6096, and 55-13767. No. 57-164123, Japanese Patent Publication No. 3-2450, Japanese Patent Application Laid-Open No. 2005-213446, No. 2005-306891, International Publication No. WO 2007-040143, US Pat. Nos. 3,632,557, 4,345,053, The ones proposed in the publications such as 4,960,844 can be mentioned.

  In addition to the (A-1) component oxyalkylene polymer having a crosslinkable silicon group, another oxyalkylene polymer having a crosslinkable silicon group may be used for the sealing material used in the present invention. Examples of such a polymer include (A-2) an oxyalkylene polymer having a crosslinkable silicon group and having a polystyrene equivalent number average molecular weight of less than 20,000 by gel permeation chromatography. When this polymer is used, the viscosity of the sealing material can be reduced, and the work at the time of sealing construction becomes easy. The structure of the crosslinkable silicon group and the main chain in the component (A-2) can be the same as that of the component (A-1). Different components (A-1) and (A-2) may be used. The component (A-2) is not essential, but when the component (A-2) is used, the mass ratio of the component (A-1) to the component (A-2) is preferably in the range of 100: 10 to 100.

  In addition, a (meth) acrylic acid alkyl ester-based polymer having a crosslinkable silicon group can be used because the weather resistance of the cured product, adhesion to a substrate or chemical resistance can be improved. In particular, (meth) acrylic acid alkyl ester polymers having 1.1 or more crosslinkable silicon groups on average in the molecule are preferable because they can form an effective crosslinked network with the polymer of component (A). The (meth) acrylic acid alkyl ester polymer having a crosslinkable silicon group is essentially a polymer having a repeating unit represented by the formula (5).

(Wherein R ³ represents a hydrogen atom or a methyl group, and R ⁴ represents an alkyl group)
R ⁴ in Formula (5) is an alkyl group, and an alkyl group having 1 to 30 carbon atoms is preferable. R ⁴ may be linear or branched. Moreover, the substituted alkyl group which has a halogen atom, a phenyl group, etc. may be sufficient. Examples of R ⁴ include methyl group, ethyl group, propyl group, n-butyl group, t-butyl group, 2-ethylhexyl group, lauryl group, tridecyl group, cetyl group, stearyl group, and behenyl group. it can.

  The molecular chain of the (meth) acrylic acid alkyl ester polymer consists essentially of the monomer unit of the formula (5), and the term “essentially” as used herein means that of the formula (5) present in the polymer. It means that the total of monomer units exceeds 50% by mass. The total of the monomer units of the formula (5) is preferably 70% by mass or more.

  Examples of monomer units other than formula (5) include (meth) acrylic acid such as acrylic acid and methacrylic acid; amide groups such as acrylamide, methacrylamide, N-methylolacrylamide, and N-methylolmethacrylamide, glycidyl acrylate Monomers containing amino groups such as epoxy groups such as glycidyl methacrylate, diethylaminoethyl acrylate, diethylaminoethyl methacrylate, aminoethyl vinyl ether; other acrylonitrile, styrene, α-methylstyrene, alkyl vinyl ether, vinyl chloride, vinyl acetate, propionic acid Examples thereof include monomer units derived from vinyl, ethylene and the like.

  When a (meth) acrylic acid alkyl ester polymer having a crosslinkable silicon group is used in combination with an oxyalkylene polymer, the compatibility with the oxyalkylene polymer having a crosslinkable silicon group is great. A molecular chain having a crosslinkable silicon group has the following formula (6):

(Wherein R ³ is the same as above, R ⁵ represents an alkyl group having 1 to ⁵ carbon atoms) and a (meth) acrylate monomer unit represented by the following formula (7):

(Wherein R ³ is the same as described above, and R ⁶ represents an alkyl group having 6 or more carbon atoms). A copolymer comprising a (meth) acrylic acid ester monomer unit is preferred.

As R < ⁵ > of said Formula (6), C1-C5, such as a methyl group, an ethyl group, a propyl group, n-butyl group, t-butyl group, etc., Preferably it is 1-4, More preferably, it is 1-2. Of the alkyl group. Incidentally, R ⁵ may be a kind, or may be a mixture of two or more.

R ^{6 in the} formula (7) is, for example, 2-ethylhexyl group, lauryl group, tridecyl group, cetyl group, stearyl group, behenyl group and the like having 6 or more carbon atoms, usually 7-30, preferably 8-20. Long chain alkyl groups. R ⁶ may be a single type or a mixture of two or more types. In addition, the mass ratio of the monomer unit of the formula (6) and the monomer unit of the formula (7) is preferably 95: 5 to 40:60, and more preferably 90:10 to 60:40.

  The (meth) acrylic acid alkyl ester polymer having a crosslinkable silicon group can usually be obtained by radical copolymerization of a (meth) acrylic acid alkyl ester and a (meth) acrylic acid alkyl ester having a crosslinkable silicon group. . Further, when an initiator having a crosslinkable silicon group or a chain transfer agent having a crosslinkable silicon group is used, the crosslinkable silicon group can be introduced into the molecular chain terminal.

  JP 2001-040037 A, JP 2003-048923 A and JP 2003-048924 A have a crosslinkable silicon group (meth) obtained by using a mercaptan having a crosslinkable silicon group and a metallocene compound. Acrylic acid alkyl ester polymers are described.

  As disclosed in JP-A-2000-086999, a (meth) acrylic acid alkyl ester-based polymer having a crosslinkable silicon group, in which a crosslinkable silicon group is introduced at a high ratio at the molecular chain terminal, Are known. Since such a polymer is produced by living radical polymerization, a crosslinkable silicon group can be introduced into the molecular chain terminal at a high rate. In the present invention, a (meth) acrylic acid alkyl ester polymer as described above can be used.

  Specific examples of a (meth) acrylic acid ester-based polymer having a crosslinkable silicon group and a mixture of this polymer and an oxyalkylene polymer having a crosslinkable silicon group are disclosed in JP-A Nos. 59-122541 and 63-112642. And in each publication such as JP-A-6-172631. JP-A-59-78223, JP-A-59-168014, JP-A-60-228516, JP-A-60-228517, etc. disclose oxyalkylene polymers having a crosslinkable silicon group. (Meth) acrylic acid ester-based monomer is polymerized in the presence of a mixture of an oxyalkylene polymer having a crosslinkable silicon group and a (meth) acrylic acid alkyl ester polymer having a crosslinkable silicon group. The method of obtaining is described.

  When using the acrylic polymer which has a crosslinkable silicon group, the usage-amount is the range of 10-100 mass parts with respect to 100 mass parts of oxyalkylene type polymers which have a crosslinkable silicon group of (A) component.

  Further, a polymer having a main chain skeleton other than an oxyalkylene polymer or a (meth) acrylic acid alkyl ester polymer and having a crosslinkable silicon group may be used. In particular, a polymer having 1.1 or more crosslinkable silicon groups on average in the molecule is preferable because the polymer of component (A) can form an effective crosslink network. Examples of the main chain skeleton of such a polymer include the following polymers.

  Ethylene-propylene copolymer, polyisobutylene, copolymer of isobutylene and isoprene, polychloroprene, polyisoprene, isoprene or copolymer of butadiene and acrylonitrile and / or styrene, polybutadiene, isoprene or butadiene and acrylonitrile , And / or copolymers with styrene, etc., hydrocarbon polymers such as hydrogenated polyolefin polymers obtained by hydrogenation of these polyolefin polymers, and polymers such as adipic acid, terephthalic acid, oxalic acid, etc. Polyester polymers such as condensation polymers of basic acids and polyhydric alcohols such as bisphenol A, ethylene glycol and neopentyl glycol, and ring-opening polymers of lactones; nylon 6, hexamethylene by ring-opening polymerization of ε-caprolactam Diamine Nylon 6 · 6 by condensation polymerization of adipic acid, nylon 6 · 10 by condensation polymerization of hexamethylenediamine and sebacic acid, nylon 11 by condensation polymerization of ε-aminoundecanoic acid, nylon 12 by ring-opening polymerization of ε-aminolaurolactam Polyamide polymers such as copolymer nylon having two or more components among the above nylons; polysulfide polymers; polycarbonate polymers produced by condensation polymerization of bisphenol A and carbonyl chloride, diallyl phthalate systems Polymer.

  When the main chain skeleton is a polymer other than an oxyalkylene polymer or a (meth) acrylic acid alkyl ester polymer and a polymer having a crosslinkable silicon group is used, the amount of such a polymer used is (A) It is preferable to use 50 parts by mass or less, further 20 parts by mass or less, particularly 10 parts by mass or less with respect to 100 parts by mass of the component.

  As the sealing material used in the present invention, an alkoxysilane compound which reacts with water and forms an amine compound having at least one alkoxysilyl group in one molecule is used as the component (B). The alkoxysilyl group is a crosslinkable silicon group in which an alkoxy group is bonded to a silicon atom as a hydrolyzable group. As an example of such a compound, a compound obtained by ketiminizing an amino group of an amine compound having an alkoxysilyl group (hereinafter also referred to as an aminosilane compound) with a carbonyl compound can be given. Examples of aminosilane compounds that undergo ketimination include γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ- (2-aminoethyl) aminopropyltrimethoxysilane, and γ- (2-aminoethyl) aminopropyl. Examples thereof include triethoxysilane and γ- (2-aminoethyl) aminopropyltrimethyldimethoxysilane.

  Examples of the carbonyl compound include aldehydes such as acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, diethylacetaldehyde, glyoxal, and benzaldehyde; cyclic ketones such as cyclopentanone, trimethylcyclopentanone, cyclohexanone, and trimethylcyclohexanone; Aliphatic ketones such as acetone, methyl ethyl ketone, methyl propyl ketone, methyl isopropyl ketone, methyl isobutyl ketone, diethyl ketone, dipropyl ketone, diisopropyl ketone, dibutyl ketone, diisobutyl ketone; acetylacetone, methyl acetoacetate, ethyl acetoacetate, malonic acid Β-dicarbonyl such as dimethyl, diethyl malonate, methyl ethyl malonate, dibenzoylylmethane Compounds; and the like can be used. When an imino group is present in the ketimine, the imino group may be reacted with styrene oxide; glycidyl ether such as butyl glycidyl ether or allyl glycidyl ether; glycidyl ester or the like.

  When component (B) such as a compound having an amino group ketiminated is used, it does not react with a compound having an epoxy group in the molecule as component (B) during storage of the composition, so that it can be made into a one-component composition. . Component (B) is KBE-9103 (manufactured by Shin-Etsu Chemical Co., Ltd.), Sila Ace S340 (manufactured by Chisso Corporation), Z-6860 (manufactured by Toray Dow Corning Co., Ltd.), X-12-812H (Shin-Etsu Chemical Co., Ltd.) Etc.) and are commercially available. The component (B) acts as an adhesion promoter.

  (B) The usage-amount of a component is 0.1-20 mass parts based on 100 mass parts of oxyalkylene polymers which have a crosslinkable silicon group of (A) component, Preferably it is 1-10 mass parts. Component (B) can be used in combination of two or more.

  The sealing material used in the present invention uses a tetravalent tin compound which is component (C). The tetravalent tin compound acts as a curing catalyst (silanol condensation catalyst) for the oxyalkylene polymer having a crosslinkable silicon group as component (A). Since tetravalent tin compounds are more stable than other curing catalysts such as divalent tin compounds and compounds other than tin compounds, they do not deteriorate during storage and can be used as a one-component sealing.

  Examples of tetravalent tin compounds include dibutyltin dilaurate, dibutyltin diacetate, dibutyltin diethylhexanoate, dibutyltin dioctate, dibutyltin dimethylmalate, dibutyltin diethylmalate, dibutyltin dibutylmalate, dibutyltin Isooctylmalate, dibutyltin ditridecylmalate, dibutyltin dibenzylmalate, dibutyltin maleate, dioctyltin diacetate, dioctyltin distearate, dioctyltin dilaurate, dioctyltin diethylmalate, dioctyltin diisooctylmalate, etc. Dialkyltin dicarboxylates; dialkyltin alkoxides such as dibutyltin dimethoxide and dibutyltin diphenoxide; dibutyltin diacetylacetonate and dibutyltin diethylacetoacetate Intramolecular coordination derivatives of dialkyl tin; reaction products of dialkyl tin oxides such as dibutyl tin oxide and dioctyl tin oxide with ester compounds such as dioctyl phthalate, diisodecyl phthalate and methyl maleate; dibutyl tin bistriethoxy silicate And a reaction product of a dialkyltin oxide such as dioctyltin bistriethoxysilicate and a silicate compound, and an oxy derivative (stannoxane compound) of these dialkyltin compounds.

  (C) The usage-amount of a component is 0.1-20 mass parts based on 100 mass parts of oxyalkylene polymers which have a crosslinkable silicon group of (A) component, Preferably it is 1-10 mass parts. Component (C) can be used in combination of two or more.

  The (meth) acrylic acid ester polymer plasticizer which is (D) component is used for the sealing material used by this invention. The (meth) acrylic acid ester polymer referred to in the present invention is an acrylic acid ester polymer or a methacrylic acid ester polymer. When a low molecular weight plasticizer such as diethyl hexyl phthalate is used as a plasticizer, the physical properties of the cured product fluctuate over time due to migration of the plasticizer, the problem that the concrete surface is contaminated when the base material is concrete, When paint is applied on concrete, there is a problem that the paint is contaminated. If a polymer plasticizer is used, such a problem does not occur. Furthermore, the use of an acrylic acid ester polymer plasticizer as component (D) has the effect of increasing the restoration rate of the cured product as compared with the use of other polymer plasticizers such as polyoxyalkylene. can get.

  The glass transition temperature (Tg) of the (meth) acrylic acid ester polymer plasticizer is preferably −20 ° C. or lower, more preferably −40 ° C. or lower, and particularly preferably −50 ° C. or lower. The weight average molecular weight of the (meth) acrylic acid ester polymer plasticizer is preferably 500 to 20,000, more preferably 1,000 to 10,000. A weight average molecular weight is a polystyrene conversion molecular weight by gel permeation chromatography (GPC).

  Monomers constituting the (meth) acrylate polymer plasticizer include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, ( Lauryl (meth) acrylate, stearyl (meth) acrylate, 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 2-ethoxyethoxyethyl (meth) acrylate, (meth) acrylic acid 2 -Phenoxyethyl, 2-methoxypropyl (meth) acrylate, 4-methoxybutyl (meth) acrylate, 4-methoxybutyl acrylate (meth) acrylate, phenyl (meth) acrylate, (meth) acrylic acid (Meth) acrylic acid esters such as triorganosilyl are preferred.

  Among these, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, stearyl acrylate, 2-methoxyethyl acrylate, 2-ethoxyethyl acrylate, 2-ethoxy acrylate Acrylic esters such as ethoxyethyl, 2-phenoxyethyl acrylate, 2-methoxypropyl acrylate, 4-methoxybutyl acrylate, 4-methoxybutyl acrylate benzyl, and phenyl acrylate are more preferable. These monomers can be used alone or in combination of two or more.

  Specific examples of (meth) acrylic acid ester polymer plasticizers include polyisopropyl acrylate, polybutyl acrylate, polyisopropyl methacrylate, poly (methyl methacrylate / butyl methacrylate), poly (methyl methacrylate / 2-ethylhexyl methacrylate) and the like. Can do.

  The (meth) acrylic acid ester polymer plasticizer can be obtained by polymerizing the monomer in the presence of a polymerization initiator. Examples of the polymerization initiator used in the polymerization reaction include 2,2'-azobisisobutyronitrile (AIBN), 2,2'-azobis-2-methylbutyronitrile, dimethyl-2,2'- Peroxides such as azo compounds such as azobisisobutyrate, benzoyl peroxide, di-tert-butyl peroxide, tert-butyl peroxybenzoate, tert-butyl peroxyisopropyl carbonate, tert-butyl peroctoate, etc. Can be mentioned. These polymerization initiators can be used alone or in combination of two or more.

  As the polymerization method, solution polymerization or bulk polymerization is preferable in that the polymer plasticizer can be obtained easily and accurately. In the case of solution polymerization, a polymerization regulator such as α-methylstyrene dimer may be added as necessary. In the case of solution polymerization, the reaction temperature in the polymerization reaction may be appropriately set according to the type of the polymerization initiator and the like, and is usually 70 to 140 ° C, preferably 80 to 120 ° C. What is necessary is just to set reaction time suitably according to reaction temperature etc., and is about 4 to 8 hours normally. The polymerization reaction in the solution polymerization is preferably performed in an inert gas atmosphere such as nitrogen gas or argon gas.

  In the case of bulk polymerization, a (meth) acrylic polymer obtained by continuously polymerizing a raw material monomer at a high temperature of 150 to 350 ° C. is preferred. For example, a (meth) acrylic ester polymer described in JP-A No. 2001-207157 is preferred. Etc. are preferably used.

  The (meth) acrylic acid polymer plasticizer used in the present invention is most preferably a (meth) acrylic polymer obtained by the above-mentioned high-temperature continuous bulk polymerization. (Meth) acrylic polymer obtained by continuous high-temperature bulk polymerization is commercially available. Examples of non-functional polymers include UP series from Toagosei Co., Ltd., and UH series from Toagosei Co., Ltd. as hydroxyl group-containing polymers. Examples of the epoxy group-containing polymer include UG series manufactured by Toagosei Co., Ltd., and examples of the alkoxysilyl group-containing polymer include US series manufactured by Toagosei Co., Ltd.

Specific examples of the (meth) acrylic polymer obtained by high-temperature continuous bulk polymerization include the following polymers manufactured by Toagosei Co., Ltd.
UP1110 (non-functional acrylic liquid polymer, trade name: ARUFON UP1110, Mw = 2,500, Tg = −64 ° C.)
UP1170 (non-functional acrylic liquid polymer, trade name: ARUFON UP1170, Mw = 8,000, Tg = −57 ° C.)
UH2032 (Hydroxyl-containing acrylic liquid polymer, trade name: ARUFON UH2032, Mw = 2,000, Tg = −60 ° C., OHV = 110 mgKOH / g)
UH2000 (Hydroxyl-containing acrylic liquid polymer, trade name: ARUFON UH2000, Mw = 11,000, Tg = −55 ° C., OHV = 20 mgKOH / g)
UG4000 (epoxy group-containing acrylic liquid polymer, trade name: ARUFON UG4000, Mw = 3,000, Tg = −61 ° C., epoxy value = 0.7 meq / g)
US6110 (alkoxysilyl group-containing acrylic liquid polymer, trade name: ARUFON US6110, Mw = 3200, Tg = −57 ° C., Si group number = 0.9 / Mn)

  The (meth) acrylic acid ester polymer plasticizer as the component (D) preferably has no crosslinkable silicon group, but may have it. When it has a crosslinkable silicon group, it acts as a reactive plasticizer. If the number of crosslinkable silicon groups in the molecule is large, it will be difficult to act as a plasticizer. Therefore, the number of crosslinkable silicon groups is preferably 1 or less per molecule, and preferably 0.8 or less.

  (D) The usage-amount of a component is 20-300 mass parts based on 100 mass parts of oxyalkylene polymers which have a crosslinkable silicon group of (A) component, Preferably it is 50-200 mass parts, More preferably, it is 70-150. Part by mass. Component (C) can be used in combination of two or more.

  The compound having an epoxy group in the molecule as the component (E) used in the sealing material of the present invention includes a compound having one epoxy group in the molecule and a compound having two or more epoxy groups in the molecule. be able to.

  The compound having an epoxy group in the molecule is preferably a compound having one epoxy group in the molecule (hereinafter also referred to as a monofunctional epoxy compound).

  Examples of monofunctional epoxy compounds include butyl glycidyl ether, 2-ethylhexyl glycidyl ether, alkyl monoglycidyl ether, phenyl glycidyl ether, cresyl glycidyl ether, allyl glycidyl ether, pt-butylphenyl glycidyl ether, nonylphenyl glycidyl ether, p-sec-Butylphenyl glycidyl ether, alkylphenol monoglycidyl ether, versatic acid monoglycidyl ester, linear alcohol monoglycidyl ether, glycerol monoglycidyl ether, polyglycol glycidyl ether, glycidyl ether such as glycidyl methacrylate, glycidyl ester or these Mixture, 1,2 epoxy dodecane, 1,2 epoxy docosan, steel Epoxy hydrocarbons or mixtures thereof such as N'okishido, cyclohexane oxide, 4-vinyl epoxy cyclohexane, 3,4-epoxycyclohexyl methanol, 3,4-epoxycyclohexylmethyl methacrylate, epoxy hexahydrophthalic di-2-ethylhexyl,

Examples thereof include, but are not limited to, alicyclic epoxy compounds.

  Flame retardant epoxy resins such as epichlorohydrin-bisphenol A type epoxy resins, epichlorohydrin-bisphenol F type epoxy resins, tetrabromobisphenol A glycidyl ether, novolac type epoxy resins, as compounds having two or more epoxy groups in the molecule, Hydrogenated bisphenol A type epoxy resin, glycidyl ether type epoxy resin of bisphenol A propylene oxide adduct, p-oxybenzoic acid glycidyl ether ester type epoxy resin, m-aminophenol type epoxy resin, diaminodiphenylmethane type epoxy resin, urethane modified epoxy Resins, various alicyclic epoxy resins, N, N-diglycidylaniline, N, N-diglycidyl-o-toluidine, triglycidyl isocyanurate, polyalkylene Examples include glycidyl ethers of polyhydric alcohols such as recall diglycidyl ether and glycerin, epoxidized products of unsaturated polymers such as hydantoin-type epoxy resins, petroleum resins, etc., but are not limited to these. The epoxy resin being used can be used. Preferred epoxy resins include bisphenol A type epoxy resins or bisphenol F type epoxy resins, bisphenol AD type epoxy resins, novolac type epoxy resins and the like. Most preferred are bisphenol A type epoxy resins. A compound having two or more epoxy groups in the molecule has a function of improving the adhesiveness of the oxyalkylene polymer having a crosslinkable silicon group. The epoxy resin is preferably liquid at normal temperature. Moreover, it is preferable that the molecular weight of an epoxy resin is 500 or less.

  (E) The usage-amount of an epoxy compound is the range of 0.1-50 mass parts with respect to 100 mass parts of oxyalkylene polymers which have a crosslinkable silicon group of (A) component. If it is less than 0.1 part by mass, the recoverability of the cured product becomes insufficient. A preferred range is 0.2 to 20 parts by mass, particularly 0.5 to 10 parts by mass.

  The sealing material used in the present invention further includes a curing catalyst other than the component (C), a plasticizer other than the component (D), a filler, an anti-aging agent, an ultraviolet absorber, a diluent, a lubricant, a pigment, a foaming agent, and the like. Can be added as needed.

  Examples of curing catalysts other than the component (C) include metal salts of carboxylic acids such as alkyl titanates, organosilicon titanates, bismuth tris 2-ethylhexoate, tin octylate and tin naphthenate: Mention may be made of amine salts such as butylamine-2-ethylhexoate and the like, as well as other acidic and basic catalysts.

  When a silanol condensation catalyst other than the component (C) is used, it is preferably used within the range in which the effect of the present invention is achieved, and is based on 100 parts by mass of the oxyalkylene polymer having a crosslinkable silicon group as the component (A). Usually, it is good to use in the range of 0.1-20 mass parts, preferably 0.2-10 mass parts.

  Examples of polymer plasticizers other than component (D) include dibasic acids such as sebacic acid, adipic acid, azelaic acid, and phthalic acid, and divalents such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, and dipropylene glycol. Polyester plasticizers obtained from alcohols; polyether polyols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like, and polyethers such as derivatives obtained by converting hydroxyl groups of these polyether polyols to ester groups, ether groups, etc .; polystyrene and Polystyrenes such as poly-α-methylstyrene; polybutadiene, polybutene, polyisobutylene, butadiene-acrylonitrile, polychloroprene, chlorinated paraffins, etc.

  Examples of low molecular weight plasticizers include phthalic acid esters such as dibutyl phthalate, diheptyl phthalate, di (2-ethylhexyl) phthalate, and butyl benzyl phthalate; dioctyl adipate, dioctyl sebacate, dibutyl sebacate, and isodecyl succinate. Aromatic dibasic acid esters; aliphatic esters such as butyl oleate and methyl acetylricinoleate; esters of polyalkylene glycols such as diethylene glycol dibenzoate, triethylene glycol dibenzoate and pentaerythritol ester; tricresyl phosphate And phosphoric acid esters such as tributyl phosphate; trimellitic acid esters.

  When a plasticizer other than the component (D) is used, it is preferably used within the range in which the effect of the present invention is achieved, and with respect to 100 parts by mass of the oxyalkylene polymer having a crosslinkable silicon group as the component (A), It is usually used in the range of 10 to 300 parts by mass, preferably in the range of 20 to 250 parts by mass. When the amount of the plasticizer other than the component (D) is less than 10 parts by mass, the viscosity of the composition may be too high, and when it exceeds 300 parts by mass, the plasticizer exudes from the cured product. May occur, which is not preferable.

  The sealing material used in the present invention does not contain a low molecular weight plasticizer having a molecular weight of 800 or less and further a molecular weight of 1,000 or less, such as a phthalate ester plasticizer, and is a so-called non-plastic blending sealant. Is preferred.

  Examples of fillers include reinforcing fillers such as fumed silica, precipitated silica, silicic anhydride and carbon black; calcium carbonate, magnesium carbonate, diatomaceous earth, calcined clay, clay, talc, hardened titanium, bentonite, organic bentonite Further, fillers such as ferric oxide, zinc oxide, activated zinc white, shirasu balloon, etc .; fibrous fillers such as asbestos, glass fibers and filaments can be used.

  When it is desired to obtain a cured product having high strength by using these fillers, mainly fumed silica, precipitated silica, anhydrous silicic acid, hydrous silicic acid and carbon black, surface-treated fine calcium carbonate, calcined clay, clay, Preferred results are obtained by using fillers selected from activated zinc white and the like. In addition, when it is desired to obtain a cured product having low strength and large elongation, a filler selected from titanium oxide, calcium carbonate, magnesium carbonate, talc, ferric oxide, zinc oxide, shirasu balloon, etc. is mainly used. Preferred results are obtained when used. Of course, these fillers may be used alone or in combination of two or more.

  When using a filler, it is usually in the range of 1 to 300 parts by weight, preferably in the range of 5 to 300 parts by weight, more preferably in the range of 5 to 300 parts by weight with respect to 100 parts by weight of the polymer having a crosslinkable silicon group as component (A). It is good to use at 250 parts by mass.

  The sealant used in the present invention is a one-component sealant. However, it can also be a multi-component sealant. In the case of a one-component type sealant, it is easy to use because there is no need for mixing work when used. The oxyalkylene-based polymer having a crosslinkable silicon group as component (A) is preferably stored in a sealed container after removing the moisture, adding a dehydrating agent, since the curing reaction proceeds when moisture is present. In the case of a multi-component curable composition, components that react with each other can be used as separate components, but a mixing operation is required at the time of use. The sealant used in the present invention is a room temperature moisture curable sealant that cures with moisture at room temperature, but may be cured by heating as necessary.

(Synthesis Example 1)
Polypropylene triol was used as an initiator, and propylene oxide was reacted in the presence of a zinc hexacyanocobaltate-glyme complex catalyst to obtain a hydroxyl-terminated polyoxypropylene having a number average molecular weight of 26,000. A methanol solution of NaOCH ₃ was added to the hydroxyl group-terminated polyoxypropylene polymer to distill off the methanol, and allyl chloride was further added to convert the terminal hydroxyl group into an allyl group. After desalting and purification treatment, methyldimethoxysilane, which is a hydrosilyl compound, is reacted in the presence of a platinum catalyst to have a methyldimethoxysilyl group at the terminal and an average of 2.1 crosslinkable silicon groups in one molecule. A polymer (1) having an average molecular weight of 26,000 was obtained.

(Synthesis Example 2)
Polypropylene triol was used as an initiator, and propylene oxide was reacted in the presence of a zinc hexacyanocobaltate-glyme complex catalyst to obtain a hydroxyl-terminated polyoxypropylene having a number average molecular weight of 16,000. A methanol solution of NaOCH ₃ was added to the hydroxyl group-terminated polyoxypropylene polymer to distill off the methanol, and allyl chloride was further added to convert the terminal hydroxyl group into an allyl group. After desalting and purification treatment, methyldimethoxysilane, which is a hydrosilyl compound, is reacted in the presence of a platinum catalyst to have a methyldimethoxysilyl group at the terminal and an average of 2.2 crosslinkable silicon groups in one molecule. A polymer (2) having an average molecular weight of 16,000 was obtained. The number-average molecular weight is a polystyrene-equivalent molecular weight measured by gel permeation chromatography using Tosoh's HLC-8120GPC as the liquid delivery system, the column using Tosoh's TSK-GELH type, and the solvent using THF.

(Examples 1-2, Comparative Examples 1-3)
A one-component sealant having the composition shown in Table 1 was prepared, and a test sample using the sealant was prepared. Using this test sample, the elastic recovery rate and tensile properties (50% tensile modulus, 150% tensile modulus, breaking strength, elongation at break, fracture state) were measured. The method for preparing the sealing material and the method for measuring the physical properties are as follows. The results are shown in Table 1.

(Method for preparing sealing material)
The polymer (1) obtained in Synthesis Example 1 as the oxyalkylene polymer having a crosslinkable silicon group as the component (A-1) shown in Table 1, and the oxy having a crosslinkable silicon group as the component (A-2) Table 1 shows the polymer (2) obtained in Synthesis Example 2 as an alkylene polymer, the acrylic ester polymer plasticizer of the component (D), or the polymer plasticizer other than the component (D), a filler and a diluent. The amount shown was charged, and the mixture was stirred under heating and reduced pressure at 110 ° C. for 2 hours to dehydrate the compounded material. Further, a predetermined amount of a compound having an epoxy group as component (E), an alkoxysilane compound that reacts with water as component (B) to produce an amine compound having an alkoxysilyl group, and a tetravalent tin compound as component (C) The mixture was added and mixed by stirring to prepare a sealing material.

(Measurement method of elastic recovery rate)
About each obtained sealing material, "5.2 Elastic resilience test" prescribed | regulated by JIS A1439: 2016 "Test method of sealing material for construction" was done.

  In addition, the mortar was used for the to-be-adhered body and the urethane type primer was applied to the site | part which a mortar to-be-adhered body and a sealing material contact. However, except for Example 3 and Comparative Example 4, the curing conditions were 23 ° C., relative humidity 50%, 3 days, and 50 ° C., relative humidity 40%, 4 days, which are different from the above JIS regulations. This is because an accelerated test was conducted.

In Example 3 and Comparative Example 4, it was performed in accordance with the above JIS B curing rules. That is, the temperature was set at 23 ° C. and relative humidity 50% for 28 days, and the next cycle was repeated three times.
1) Use an air circulating incubator for 3 days at 70 ° C.
2) Place in water at 23 ° C for 1 day.
3) Use an air circulating incubator for 2 days at 70 ° C.
4) Place in 23 ° C water for 1 day.

(Measurement method of tensile properties)
About each obtained sealing material, perform "5.3 Tensile property test" prescribed | regulated by JIS A1439: 2016 "Test method of sealing material for construction", and also check the fracture condition visually after the sealing material is broken. did. CF in the fractured state represents cohesive failure of the sealing portion, and AF represents peeling from the adhesive interface.

  In addition, the mortar was used for the to-be-adhered body and the urethane type primer was applied to the site | part which a mortar to-be-adhered body and a sealing material contact. However, except for Example 3 and Comparative Example 4, the curing conditions were 23 ° C., relative humidity 50%, 3 days, and 50 ° C., relative humidity 40%, 4 days, which are different from the above JIS regulations. This is because an accelerated test was conducted. In Example 3 and Comparative Example 4, it was performed in accordance with the above JIS B curing rules.

(Example 4, Comparative Examples 5-7)
Sealing was prepared in the same manner as in Examples 1 and 2 and Comparative Examples 1 to 3 except that the tetravalent tin compound was changed, and each measurement was performed. The results are shown in Table 1.

In Table 1, the compounding quantity of each compounding substance is shown in parts by mass. Details of each compounding substance are as follows.
* 1: Polymer (1) obtained in Synthesis Example 1
* 2: Polymer (2) obtained in Synthesis Example 2
* 3: 3-Ethoxysilyl-N- (1,3 dimethylbutylidene), ketimine compound obtained by reaction of 3-aminopropyltriethoxysilane and methyl isobutyl ketone, manufactured by Shin-Etsu Chemical Co., Ltd., X-12-807H
* 4: Dioctyltin oxide reaction product (tin-based curing catalyst described in Production Example 2 of Patent No. 6052061)
* 5: Dibutyltin diacetylacetonate, manufactured by Nitto Kasei Co., Ltd., Neostan U220
* 6: Acrylic ester polymer plasticizer having a weight average molecular weight of 2500 obtained by high-temperature continuous bulk polymerization, UP1110, manufactured by Toagosei Co., Ltd.
* 7: Polypropylene glycol polymer plasticizer having a number average molecular weight of 3,200, manufactured by Asahi Glass Co., Ltd., Exenol 3020
* 8: 3-glycidoxypropyltrimethoxysilane, KBM-403 manufactured by Shin-Etsu Chemical Co., Ltd.
* 9: Fatty acid-treated colloidal calcium carbonate, manufactured by Maruo Calcium, Calfine 500
* 10: Surface-treated heavy calcium carbonate, manufactured by Bihoku Powder Chemical Co., Ltd., Ryton A5
* 11: Vinyltrimethoxysilane, manufactured by Shin-Etsu Chemical Co., Ltd., KBM1003
* 12: C11 paraffin, manufactured by Japan Energy, Cactus normal paraffin N-11

Claims (5)

A building having a wall-type structure, using a precast reinforced concrete wall and having a wall-type structure in which a sealing material used for a joint between the walls is the following sealing material.
(A) (A-1) having a hydroxyl group or hydrolyzable group bonded to a silicon atom, having a silicon-containing group that can be cross-linked by forming a siloxane bond, and a polystyrene-reduced number average by gel permeation chromatography An oxyalkylene polymer having a molecular weight of 20,000 or more is an essential component, and (A-2) has a hydroxyl group or hydrolyzable group bonded to a silicon atom and can be crosslinked by forming a siloxane bond. An oxyalkylene polymer having a group and having a polystyrene-equivalent number average molecular weight of less than 20,000 by gel permeation chromatography is an optional component, and the mass ratio of the component (A-1) to the component (A-2) is It has a hydroxyl group or hydrolyzable group bonded to a silicon atom that is 100: 0 to 100: 100, and forms a siloxane bond. Alkoxysilane compound 0.5 which reacts with 100 parts by mass of (B) water having an oxyalkylene-based polymer having a silicon-containing group which can be more crosslinked to produce an amine compound having at least one alkoxysilyl group in one molecule. ~ 20 parts by mass,
(C) 0.1-10 parts by mass of a tetravalent tin compound,
(D) 10-200 parts by mass of (meth) acrylic acid ester polymer plasticizer,
(E) 0.5 to 20 parts by mass of a compound having an epoxy group in the molecule,
One-component sealant containing   (A-1) Component having a hydroxyl group or hydrolyzable group bonded to a silicon atom, having a silicon-containing group that can be cross-linked by forming a siloxane bond, and a polystyrene-equivalent number average by gel permeation chromatography The building having a wall structure according to claim 1, wherein the oxyalkylene polymer having a molecular weight of 20,000 or more is a polymer obtained by polymerizing alkylene oxide using a double metal cyanide complex catalyst.   (A-2) A hydroxyl group or hydrolyzable group bonded to a silicon atom as a component, a silicon-containing group that can be cross-linked by forming a siloxane bond, and a polystyrene-equivalent number average by gel permeation chromatography The wall type structure according to claim 1 or 2, wherein the oxyalkylene polymer having a molecular weight of less than 20,000 is a polymer obtained by polymerizing an alkylene oxide using a double metal cyanide complex catalyst. Building that has.   (D) The building which has a wall type structure of any one of Claims 1-3 whose polystyrene conversion number average molecular weight by an acrylic ester polymer plasticizer is 10,000 or less by gel permeation chromatography.   (E) The building which has a wall type structure of any one of Claims 1-4 whose compound which has an epoxy group in a molecule | numerator is a compound which has one epoxy group in a molecule | numerator.