JP7072187B2 - Floor structure and its construction method - Google Patents

Description

The present invention relates to a floor structure and a construction method thereof.

Conventionally, a floor structure has been constructed by laying and integrating a floor finishing material on a floor base material using an adhesive. In apartments and other condominiums, there is a noise problem in which the sound generated on the upper floors is transmitted to the rooms downstairs.

In order to solve the above noise problem, a cushioning material such as a synthetic resin foam sheet is laminated and integrated on the back surface of the floor finishing material to suppress the sound generated on the upper floor from being transmitted to the room downstairs through the floor finishing material. Is being tried.

In recent years, floor heating has become widespread. In a floor structure in which floor heating is installed, a floor heating panel is arranged on the floor base, and a floor finishing material is laid and integrated on the floor heating panel using an adhesive to form the floor structure. Has been done.

On the other hand, after the floor finishing material is completely peeled off to solve problems after construction of the floor structure or for remodeling, a new floor finishing material is arranged and integrated on the floor base material to form the floor structure. Construction is being done.

However, in the conventional floor structure, when the floor finishing material is peeled off, the cushioning material provided on the back surface of the floor finishing material is destroyed and remains on the floor base material side, the floor base material is destroyed, or the floor base material is destroyed. There is a problem that the adhesive remains on the floor base material side.

When the above situation occurs, repair work of the floor base material and removal work of the adhesive occur, and there is a problem that the construction efficiency is lowered.

In order to solve such a problem, in Patent Document 1, a new base material is provided on the existing floor finish material without peeling and removing the floor finish material, and the floor finish is performed on the base material. The method of pasting the lumber is disclosed.

Further, Patent Document 2 describes an adhesive method for a floor structure in which a floor finishing material is attached to a base material with an adhesive, and when the floor finishing material is reattached, a back cushion of the floor finishing material and a back cushion of the floor finishing material are used. A method for adhering a floor structure in which breakage occurs at the interface with an adhesive for fixing the floor finishing material is disclosed.

Japanese Unexamined Patent Publication No. 2012-246663 Japanese Unexamined Patent Publication No. 2011-236620

However, in the construction method described in Patent Document 1, the height of the floor surface becomes higher than the height of the floor surface before construction. Therefore, when the door is opened and closed, the lower surface of the door comes into contact with the floor surface. It has a problem that the floor surface is scratched.

Even in the method of adhering the floor structure described in Patent Document 2, since the adhesive layer remains on the floor base material side, the same problem as in the case of the method described in Patent Document 1 occurs. Further, Patent Document 2 describes that the adhesive is not particularly limited as long as it is a modified silicone resin adhesive, but some of the modified silicone resin adhesives are cushioning materials provided on the back surface of the floor finishing material. However, there are some cases where the material is destroyed and remains on the floor base material side.

INDUSTRIAL APPLICABILITY The present invention can firmly bond and integrate a floor finishing material onto a metal sheet of a floor base material or an underfloor arrangement for a long period of time (adhesiveness), and is curable on the floor base material or the underfloor arrangement. Provided is a floor structure capable of easily peeling and removing a floor finishing material from a floor base material or an underfloor arrangement (peeling property) while reducing the residual cured product of the composition.

The floor structure of the present invention is
Floor base material and
A floor finishing material laid on the floor base material and containing a synthetic resin layer laminated and integrated on the floor finishing material main body and the back surface of the floor finishing material main body.
A floor structure including a cured material layer that integrates the floor base material and the floor finishing material.
The cured product layer is composed of 100 parts by mass of a modified silicone resin, 0.5 to 8 parts by mass of a crosslinkable silyl compound having a glycidyl group, 60 to 200 parts by mass of a filler, and 0 a crosslinkable silyl compound having a functional group derived from an amino group. It contains a cured product of a curable composition containing up to 0.3 parts by mass, and is characterized in that the maximum stress of the cured product is 1.0 MPa or more and the elongation at break is 80% or more.

The floor structure of the present invention is
Floor base material and
An underfloor arrangement having a metal sheet laid on the floor base material and having an alumite-treated surface or a synthetic resin layer laminated and integrated on the surface forming the upper surface.
A floor finishing material laid on the underfloor arrangement and containing a synthetic resin layer laminated and integrated on the floor finishing material main body and the back surface of the floor finishing material main body.
A floor structure including a metal sheet of the underfloor arrangement and a cured material layer in which the floor finishing material is integrated.
The cured product layer is composed of 100 parts by mass of a modified silicone resin, 0.5 to 8 parts by mass of a crosslinkable silyl compound having a glycidyl group, 60 to 200 parts by mass of a filler, and 0 a crosslinkable silyl compound having a functional group derived from an amino group. It contains a cured product of a curable composition containing up to 0.3 parts by mass, and is characterized in that the maximum stress of the cured product is 1.0 MPa or more and the elongation at break is 80% or more.

The construction method of the floor structure of the present invention
The process of applying the curable composition on the floor base material and
A step of laying a floor finishing material containing a synthetic resin layer laminated and integrated on the floor finishing material main body and the back surface of the floor finishing material main body on the curable composition.
A method for constructing a floor structure, which comprises a step of curing the curable composition to form a cured product layer and integrating the floor base material and the floor finishing material with the cured product layer.
The curable composition comprises 100 parts by mass of a modified silicone resin, 0.5 to 8 parts by mass of a crosslinkable silyl compound having a glycidyl group, 60 to 200 parts by mass of a filler, and a crosslinkable silyl compound having a functional group derived from an amino group. It is characterized by containing 0 to 0.3 parts by mass.

The construction method of the floor structure of the present invention
A process of laying an underfloor arrangement having a metal sheet having an alumite-treated surface or a synthetic resin layer laminated on the surface forming an upper surface on the floor base material.
The step of applying the curable composition onto the metal sheet of the underfloor arrangement, and
A step of laying a floor finishing material containing a synthetic resin layer laminated and integrated on the floor finishing material main body and the back surface of the floor finishing material main body on the curable composition.
A method for constructing a floor structure, which comprises a step of curing the curable composition to form a cured product layer and integrating the metal sheet and the floor finishing material with the cured product layer.
The curable composition comprises 100 parts by mass of a modified silicone resin, 0.5 to 8 parts by mass of a crosslinkable silyl compound having a glycidyl group, 60 to 200 parts by mass of a filler, and a crosslinkable silyl compound having a functional group derived from an amino group. It is characterized by containing 0 to 0.3 parts by mass.

Since the floor structure of the present invention has the above-mentioned structure, the floor finishing material can be firmly adhered and integrated on the metal sheet of the floor base material or the underfloor arrangement for a long period of time, while the underfloor. The floor finishing material can be easily peeled off and removed from the floor base material or the underfloor arrangement while reducing the residual of the cured product of the curable composition on the base material or the underfloor arrangement.

It is a schematic cross-sectional view which showed the floor finishing material. It is a schematic sectional drawing which showed the floor structure of this invention. It is a schematic sectional drawing which showed another example of the floor structure of this invention.

An example of the floor structure of the present invention will be specifically described. The floor structure A comprises a floor base material 1, a floor finishing material 2 laid on the floor base material 1 and having a synthetic resin layer laminated and integrated on the back surface, and a floor base material 1 and a floor finishing material 2. Includes the integrated cured product layer 3.

[Floor base material]
The floor base material 1 constituting the floor structure A is not particularly limited, and examples thereof include a floor base material containing concrete such as a slate board.

[Floor finishing material]
The floor finishing material 2 is laid and integrated on the floor base material 1. As shown in FIG. 1, the floor finishing material 2 includes a floor finishing material main body 21 and a synthetic resin layer 22 laminated and integrated on the back surface of the floor finishing material main body 21.

The floor finishing material main body 21 is made of plywood, wood materials such as Medium Density Fiberboard (MDF), polyvinyl chloride resin, polyolefin resin, tiles, stone materials, etc. The floor finishing material main body formed from the wood material is preferable.

The synthetic resin layer 22 preferably has a shock absorbing action of absorbing the shock applied to the floor finishing material. Examples of the synthetic resin layer 22 include a polyurethane foam sheet, a polyethylene foam sheet, a synthetic resin foam sheet such as a polypropylene foam sheet, a shock absorbing sheet such as a thermoplastic elastomer sheet, and the like, and a polyethylene foam sheet is preferable.

A non-foamed sheet 23 made of synthetic resin may be laminated and integrated on the back surface of the shock absorbing sheet (the surface opposite to the floor finishing material 21) to prevent moisture permeation. Examples of such non-woven fabric 23 include non-woven fabrics, polyethylene non-woven fabrics, and the like, preferably non-woven fabrics, and more preferably spunbonded non-woven fabrics.

[Curing product layer of curable composition]
The floor base material 1 and the floor finishing material 2 are integrated by a cured product layer 3 of a curable composition. The curable composition comprises 100 parts by mass of a modified silicone resin, 0.5 to 8 parts by mass of a crosslinkable silyl compound having a glycidyl group, 60 to 200 parts by mass of a filler, and 0 a crosslinkable silyl compound having a functional group derived from an amino group. Contains up to 0.3 parts by mass.

[Modified silicone resin]
The modified silicone resin is a polymer having a hydrolyzable silyl group. The modified silicone resin may be used alone or in combination of two or more.

The polymer that becomes the main chain of the modified silicone resin is not particularly limited, and includes, for example, a polyoxyalkylene-based polymer, a polyalkyl (meth) acrylate-based polymer, an oxyalkylene block, and an alkyl (meth) acrylate block. Examples thereof include block copolymers, and polyoxyalkylene-based polymers are preferable. In addition, in this invention, (meth) acrylate means acrylate or methacrylate.

In the polyoxyalkylene polymer, the main chain has a general formula:-(RO) n- (in the formula, R represents an alkylene group having 1 to 14 carbon atoms, and n is the number of repeating units. A polymer containing a repeating unit represented by (is a positive integer) is preferable. The main chain skeleton of the polyoxyalkylene polymer may consist of only one type of repeating unit or may consist of two or more types of repeating units.

Examples of the main chain skeleton of the polyoxyalkylene polymer include polyethylene oxide, polypropylene oxide, polybutylene oxide, polytetramethylene oxide, polyethylene oxide-polypropylene oxide copolymer, and polypropylene oxide-polybutylene oxide copolymer. Be done. Of these, polypropylene oxide is preferable. According to polypropylene oxide, the curable composition has excellent adhesiveness.

Examples of the alkyl (meth) acrylate component constituting the polyalkyl (meth) acrylate-based polymer include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate. And so on. The alkyl (meth) acrylate may be used alone or in combination of two or more.

Examples of the polyalkyl (meth) acrylate-based polymer include polymethyl (meth) acrylate, polyethyl (meth) acrylate, polybutyl (meth) acrylate, and poly2-ethylhexyl (meth) acrylate.

In a block copolymer having an oxyalkylene block and an alkyl (meth) acrylate block, the oxyalkylene block is a general formula:-(RO) n- (in the formula, R is an alkylene having 1 to 14 carbon atoms. Represents a group, where n is the number of repeating units and is a positive integer) and refers to a block containing repeating units.

Examples of the oxyalkylene block include ethylene oxide block, propylene oxide block, butylene oxide block, and tetramethylene oxide block. Of these, propylene oxide is preferable. According to propylene oxide, the curable composition has excellent adhesiveness. The oxyalkylene block may consist of only one type of repeating unit or may consist of two or more types of repeating units.

In a block copolymer having an oxyalkylene block and an alkyl (meth) acrylate block, the alkyl (meth) acrylate block is a polymer block of an alkyl (meth) acrylate. Examples of the alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate. The alkyl (meth) acrylate may be used alone or in combination of two or more.

The modified silicone resin has a hydrolyzable silyl group. In the present invention, the hydrolyzable silyl group is a group in which 1 to 3 hydrolyzable groups are bonded to a silicon atom.

The hydrolyzable group of the hydrolyzable silyl group is not particularly limited, and examples thereof include a hydrogen atom, an alkoxy group, an acyloxy group, a ketoximate group, an aminooxy group, a mercapto group, and an alkenyloxy group.

Among them, as the hydrolyzable silyl group, an alkoxysilyl group is preferable because the hydrolysis reaction is mild. Examples of the alkoxysilyl group include a trialkoxysilyl group such as a trimethoxysilyl group, a triethoxysilyl group, a triisopropoxysilyl group, and a triphenoxysilyl group; a dialkoxysilyl group such as a methyldimethoxysilyl group and a methyldiethoxysilyl group. Groups; as well as monoalkoxysilyl groups such as dimethylmethoxysilyl group and dimethylethoxysilyl group. Of these, a dialkoxysilyl group is more preferable, and a methyldimethoxysilyl group is particularly preferable, because the curable composition is excellent in adhesiveness.

Since the modified silicone resin can improve the curability of the curable composition and increase the initial strength of the cured product of the curable composition (hereinafter, may be simply referred to as “cured product”), it can be contained in one molecule. It is preferable to have 1.0 to 5.0 hydrolyzable silyl groups on average, and more preferably 1.0 to 3.0 hydrolyzable silyl groups. It is particularly preferable to have an average of 1.5 to 3.0 hydrolyzable silyl groups in one molecule. When the average number of hydrolyzable silyl groups in one molecule is 1.0 or more, the adhesiveness of the curable composition is excellent, the curability of the curable composition is improved, and the cured product is obtained. Initial strength is improved. When the average number of hydrolyzable silyl groups in one molecule is 5.0 or less, the peelability of the cured product of the curable composition is improved, which is preferable.

Since the modified silicone resin improves the adhesiveness of the curable composition, it is preferable that the modified silicone resin has a hydrolyzable silyl group at at least one of the ends of the molecular chain.

The average number of hydrolyzable silyl groups in one molecule of the modified silicone resin can be calculated from the ratio of the peak areas derived from the hydrolyzable silyl groups in the modified silicone resin obtained by ¹ H-NMR. ..

The number average molecular weight of the modified silicone resin is preferably 2000 to 20000, more preferably 3000 to 12000, particularly preferably 3000 to 10000, and most preferably 4000 to 6000. When the number average molecular weight is 2000 or more, the peelability of the cured product of the curable composition is improved. When the number average molecular weight is 20000 or less, the coatability of the curable composition is improved.

In the present invention, the number average molecular weight of the modified silicone resin is a value converted from polystyrene using a gel permeation chromatography (GPC) method. For example, it can be measured with the following measuring device and measuring conditions.

<Measuring device>
Product name "Waters 2690" manufactured by Waters
<Measurement conditions>
Column: Shodex GPC KF800D
(4.6mm ID250mm) x 2 Column temperature: 40 ° C
Mobile phase: Tetrahydrofuran (0.3 mL / min)
Sample concentration: 0.2% by mass
Detector: RI WATERS product name "2414"

The viscosity of the modified silicone resin at 25 ° C. is preferably 200 to 10000 mPa · s.

The viscosity of the modified silicone resin at 25 ° C. can be measured by a method according to JIS K1557 using a Brookfield viscometer under the conditions of 25 ° C. and 10 rpm.

The modified silicone resin preferably contains a modified silicone resin having a viscosity at 25 ° C. of 200 to 2000 mPa · s and whose main chain polymer is a polyoxyalkylene polymer as a reactive diluent.

The reactive diluent is commercially available from Kaneka Corporation under the trade names "SAT010" and "SAX015".

The content of the modified silicone resin in the curable composition, which has a viscosity at 25 ° C. of 200 to 2000 mPa · s and whose main chain polymer is a polyoxyalkylene polymer, is 5 to 50 in the modified silicone resin. The mass% is preferable, 10 to 45% by mass is more preferable, and 20 to 35% by mass is particularly preferable.

When the viscosity at 25 ° C. is 200 to 2000 mPa · s and the content of the modified silicone resin in which the main chain polymer is a polyoxyalkylene polymer is 5% by mass or more, the cured product of the curable composition The peelability is improved.

When the viscosity at 25 ° C. is 200 to 2000 mPa · s and the content of the modified silicone resin in which the main chain polymer is a polyoxyalkylene polymer is 50% by mass or less, the adhesiveness of the curable composition is high. improves.

[Crosslinkable silyl compound with glycidyl group]
The curable composition contains a crosslinkable silyl compound having a glycidyl group. The crosslinkable silyl compound having a glycidyl group is a compound having 1 to 3 hydrolyzable groups bonded to a silicon atom and having a glycidyl group in the molecule. Since the hydrolyzable group is the same as described above, the description thereof will be omitted.

Examples of the crosslinkable silyl compound having a glycidyl group include 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, and 3-glycidoxypropyl. Examples thereof include triethoxysilane, and 3-glycidoxypropyltrimethoxysilane is preferable. The crosslinkable silyl compound having a glycidyl group may be used alone or in combination of two or more.

The content of the crosslinkable silyl compound having a glycidyl group in the curable composition is 0.5 to 8 parts by mass, preferably 1 to 5 parts by mass with respect to 100 parts by mass of the modified silicone resin. When the content of the crosslinkable silyl compound having a glycidyl group is 0.5 parts by mass or more, the adhesiveness of the curable composition is improved. When the content of the crosslinkable silyl compound having a glycidyl group is 8 parts by mass or less, the peelability of the cured product of the curable composition is improved.

[Filler]
The curable composition contains a filler. The filler is not particularly limited, and for example, calcium carbonate, magnesium carbonate, calcium oxide, hydrous silicic acid, anhydrous silicic acid, fine powder silica, calcium silicate, titanium dioxide, clay, talc, carbon black, glass balloon and the like. Calcium carbonate is preferable, and heavy calcium carbonate is more preferable. These fillers may be used alone or in combination of two or more.

The filler may be surface-treated. Examples of the surface treatment include surface treatment with organic compounds such as saturated fatty acids, unsaturated fatty acids, logonic acids and resin acids.

By including the surface-treated filler, the thixophilicity of the curable composition is easily improved, and the coatability of the curable composition is improved.

The content of the filler in the curable composition is 60 to 200 parts by mass, preferably 80 to 150 parts by mass with respect to 100 parts by mass of the modified silicone resin. When the content of the filler is 60 parts by mass or more, the adhesiveness of the curable composition is improved. When the content of the filler is 200 parts by mass or less, the coatability of the curable composition is improved.

In the filler, the content of the surface-treated filler is preferably 3% by mass or more, more preferably 5% by mass or more, and particularly preferably 8% by mass or more. In the filler, the content of the surface-treated filler is preferably 30% by mass or less, more preferably 25% by mass or less, and particularly preferably 20% by mass or less. When the content of the surface-treated filler is 3% by mass or more, the coatability of the curable composition is improved. When the content of the surface-treated filler is 30% by mass or less, the strength of the cured product of the curable composition is improved.

[Crosslinkable silyl compound having a functional group derived from an amino group]
The curable composition contains 0 to 0.3 parts by mass of a crosslinkable silyl compound having a functional group derived from an amino group with respect to 100 parts by mass of the modified silicone resin.

That is, when the curable composition does not contain a crosslinkable silyl compound having a functional group derived from an amino group, or contains a crosslinkable silyl compound having a functional group derived from an amino group, the amino group The crosslinkable silyl compound having a derived functional group is contained in an amount of 0.3 parts by mass or less with respect to 100 parts by mass of the modified silicone resin.

The curable composition preferably does not contain a crosslinkable silyl compound having a functional group derived from an amino group.

Since the crosslinkable silyl compound having a functional group derived from an amino group is contained in an amount of 0 to 0.3 parts by mass with respect to 100 parts by mass of the modified silicone resin, the cured product of the curable composition has excellent peelability. are doing.

From the viewpoint of achieving both adhesiveness and peelability, the crosslinkable silyl compound having a functional group derived from an amino group is preferably 0.01 to 0.25 parts by mass, preferably 0.05 to 0.25 parts by mass with respect to 100 parts by mass of the modified silicone resin. 0.2 parts by mass is more preferable.

The crosslinkable silyl compound having a functional group derived from an amino group is a compound having 1 to 3 hydrolyzable groups bonded to a silicon atom and having a functional group derived from an amino group in the molecule. Since the hydrolyzable group is the same as described above, the description thereof will be omitted.

The functional group derived from an amino group includes an amino group and a functional group in which the hydrogen atom of the amino group is substituted with another atom or an atomic group. Examples of the atom that replaces the hydrogen atom of the amino group include a chlorine atom and a bromine atom. Examples of the atomic group that replaces the hydrogen atom of the amino group include a 2-aminoethyl group; a 3- (trialkoxysilyl) propyl group such as a 3- (trimethoxysilyl) propyl group and a 3- (triethoxysilyl) propyl group. Examples thereof include a 3- (alkyldialkoxysilyl) propyl group such as a 3- (methyldimethoxysilyl) propyl group.

The crosslinkable silyl compound having a functional group derived from an amino group preferably does not have a glycidyl group. The crosslinkable silyl compound having an amino group-derived functional group is not particularly limited as long as it has an amino group-derived functional group, and is, for example, 3-aminopropyltrimethoxysilane or 3-aminopropylmethyldimethoxysilane. , 3-Aminopropyltriethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) ) -3-Aminopropyltriethoxysilane, N, N'-bis- [3- (trimethoxysilyl) propyl] ethylenediamine, N, N'-bis- [3- (triethoxysilyl) propyl] ethylenediamine, N, N'-bis- [3- (methyldimethoxysilyl) propyl] ethylenediamine, N, N'-bis- [3- (trimethoxysilyl) propyl] hexamethylenediamine, N, N'-bis- [3- (tri) Ethoxylyl) propyl] hexamethylenediamine and the like.

[Curing catalyst]
The curable composition preferably contains a curing catalyst. The curing catalyst is not particularly limited, and for example, dibutyltin dilaurate, dibutyltin oxide, dibutyltin diacetate, dibutyltin phthalate, bis (dibutyltin lauric acid) oxide, dibutyltin bis (acetylacetonate), and dibutyltin bis. (Monoestermalate), tin octylate, dibutyltin octate, dioctyltin oxide, dibutyltin bis (triethoxysilicate), bis (dibutyltin bistriethoxysilicate) oxide, dibutyltin oxybisethoxysilicate, 1,1,3 , 3-Tetrabutyl-1,3-dilauryloxycarbonyl-distanoxane and the like; organic tin compounds such as tetra-n-butoxytitanate and tetraisopropoxytitanate and the like. The curing catalyst may be used alone or in combination of two or more.

The content of the curing catalyst in the curable composition is preferably 0.1 to 10 parts by mass, more preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the modified silicone resin. When the content of the curing catalyst is 0.1 part by mass or more, the curability of the curable composition is improved. When the content of the curing catalyst is 10 parts by mass or less, the thermal stability of the curable composition is improved.

[Other additives]
The curable composition contains other additives such as thixotropic agents, antioxidants, UV absorbers, pigments, dyes, antioxidants, dehydrating agents and solvents, as long as the effects are not impaired. You may be.

Examples of the antioxidant include hindered phenol-based antioxidants, hindered amine-based antioxidants, monophenol-based antioxidants, bis-hindered phenol-based antioxidants, less hindered phenol-based antioxidants, and polyphenol-based oxidation. Examples thereof include a hindered phenol-based antioxidant, and a hindered amine-based antioxidant is preferable. The content of the antioxidant in the curable composition is preferably 0.1 to 20 parts by mass, more preferably 0.3 to 10 parts by mass with respect to 100 parts by mass of the modified silicone resin.

Examples of the ultraviolet absorber include a benzotriazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, and the like, and a benzotriazole-based ultraviolet absorber is preferable. The content of the ultraviolet absorber in the curable composition is preferably 0.1 to 20 parts by mass, more preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of the modified silicone resin.

In the curable composition, under a 23 ° C. atmosphere using a Brookfield type viscometer, the rotor No. The viscosity under the conditions of 5 and 10 rpm is preferably 100,000 mPa or less, more preferably 70,000 mPa or less, and particularly preferably 50,000 mPa or less. When the viscosity of the curable composition is 100,000 mPa or less, the coatability of the curable composition is improved.

In the curable composition, under a 23 ° C. atmosphere using a Brookfield type viscometer, the rotor No. Viscosity under the conditions of 5 and 1 revolution per minute, and under a 23 ° C atmosphere using a Brookfield viscometer, rotor No. Ratio to viscosity under conditions of 5 and 10 rpm (Viscosity under conditions of rotor No. 5 and 1 revolution per minute under a 23 ° C atmosphere using a Brookfield viscometer / Brookfield viscometer) The viscosity) under the conditions of rotor No. 5 and 10 rotations per minute) is preferably 3 or more, and more preferably 4 or more. When the viscosity ratio is 3 or more, the coatability of the curable composition is improved.

In the curable composition, under a 23 ° C. atmosphere using a Brookfield type viscometer, the rotor No. Viscosity under the conditions of 5 and 1 revolution per minute, and under a 23 ° C atmosphere using a Brookfield viscometer, rotor No. Ratio to viscosity under conditions of 5 and 10 rpm (Viscosity under conditions of rotor No. 5 and 1 revolution per minute under a 23 ° C atmosphere using a Brookfield viscometer / Brookfield viscometer) The viscosity) under the conditions of rotor No. 5 and 10 rotations per minute) is preferably 10 or less, more preferably 8 or less, and particularly preferably 7 or less.

In the curable composition, under a 23 ° C. atmosphere using a Brookfield type viscometer, the rotor No. 5 and the viscosity under a predetermined minute speed condition refer to a value measured according to JIS K6833-1.

[Manufacturing of curable composition]
The curable composition can be produced by mixing a modified silicone resin, a crosslinkable silyl compound having a glycidyl group and a filler, and a compound added as necessary in a known manner. Mixing is preferably performed under reduced pressure.

[Floor structure]
In the floor structure A, as shown in FIG. 2, a floor finishing material 2 is laid on the floor base material 1, and the floor base material 1 and the floor finishing material 2 include a cured product of a curable composition. It is integrally formed by the cured product layer 3.

The curable composition is cured by the humidity in the air to form a cured product, and the floor base material 1 and the floor finishing material 2 are integrated by this cured product. Since the curable composition has excellent adhesiveness, the floor base material 1 and the floor finishing material 2 are stably integrated over a long period of time.

The maximum stress of the cured product of the curable composition is preferably 1.0 MPa or more, more preferably 1.1 MPa or more, and particularly preferably 1.2 MPa or more. When the maximum stress of the cured product is 1.1 MPa or more, the cured product of the curable composition has excellent peelability.

The maximum stress of the cured product of the curable composition is preferably 10 MPa or less, more preferably 8 MPa or less, and particularly preferably 7 MPa or less.

The maximum stress of the cured product of the curable composition is a value measured according to JIS K6251 using a No. 3 dumbbell as a test piece.

The elongation at break of the cured product of the curable composition is preferably 80% or more, more preferably 90% or more, and particularly preferably 100% or more. When the elongation at break is 80% or more, when the floor finishing material is peeled off from the floor base material or the underfloor arrangement, the cured product of the curable composition remains on the floor base material or the underfloor arrangement. Can be reduced.

The elongation at break of the cured product of the curable composition is a value measured according to JIS K6251 using a No. 3 dumbbell as a test piece.

On the other hand, the floor finishing material 2 may be peeled off or removed from the floor base material 1 due to a defect or reform after construction. In such a case, since the cured product of the curable composition constituting the floor structure has excellent peelability, the synthetic resin layer laminated on the back surface of the floor finishing material 2 is damaged. The floor finishing material 2 can be easily peeled off and removed from the floor base material 1 while reducing the amount of the cured product of the curable composition remaining on the floor base material 1.

[Construction method of floor structure]
The construction method of the floor structure A will be described. First, the curable composition is applied onto the floor base material 1 by a general-purpose method.

Next, the floor finishing material 2 is laid on the curable composition applied on the floor base material 1 so that the synthetic resin layer thereof is on the curable composition side.

Then, by curing the curable composition for a predetermined period of time, the curable composition is cured by the humidity in the air to form a cured product layer 3, and the cured product layer 3 is used to finish the floor base material 1 and the floor. The floor structure A can be constructed by adhering and integrating the material 2 with the material 2.

[Another example of a floor structure]
In the above, the case where the floor finishing material 2 is laid and integrated by the cured material layer 3 containing the cured product of the curable composition on the floor base material 1 has been described, but the floor base material has been described. An underfloor arrangement 4 is arranged on the floor 1, and a floor finishing material 2 is laid and integrated on the underfloor arrangement 4 by a cured product layer containing a cured product of a curable composition. It may be a body.

Examples of the member constituting the floor base material 1 of this floor structure include plywood, plywood board, wood joist, gypsum board, slate board, concrete board and the like.

The underfloor heating panel 4 is not particularly limited as long as the upper surface is formed by a metal sheet having an alumite-treated surface or a synthetic resin layer laminated and integrated on the surface, and a floor heating panel is preferable.

As the floor heating panel, a general-purpose one can be used. It has a distributed distribution pipe and a metal sheet such as a metal foil arranged on the panel body.

The surface (upper surface) of the metal sheet is anodized or has a synthetic resin layer laminated and integrated. The synthetic resin constituting the synthetic resin layer is not particularly limited, and examples thereof include polyester resins such as polyethylene terephthalate and polyamide resins.

In the floor structure A, as shown in FIG. 3, the underfloor arrangement 4 is arranged on the floor base material 1. Further, the floor finishing material 2 is laid on the underfloor arrangement 4, and the metal sheet of the underfloor arrangement 4 and the floor finishing material 2 are integrated by the cured material layer 3 containing the cured product of the curable composition. It is composed of.

As described above, the curable composition is cured by the humidity in the air to form a cured product, and the metal sheet of the underfloor arrangement 4 and the floor finishing material 2 are integrated by the cured product. Since the curable composition has excellent adhesiveness to the alumite-treated surface and the synthetic resin, the metal sheet of the underfloor arrangement 4 and the floor finishing material 2 can be stably adhered to the floor finishing material 2 for a long period of time. Integrate.

On the other hand, the floor finishing material 2 may be peeled off and removed from the metal sheet of the underfloor arrangement 4 due to a defect or reform after construction. In such a case, since the cured product of the curable composition constituting the floor structure has excellent peelability to the alumite-treated surface and the synthetic resin, the back surface of the floor finishing material 2 is used. The floor finishing material 2 is applied to the underfloor arrangement 4 without damaging the synthetic resin layer laminated on the floor and reducing the amount of the cured product of the curable composition remaining on the metal sheet of the underfloor arrangement 4. Can be easily peeled off and removed from the metal sheet of.

[Construction method of floor structure]
The construction method of the floor structure A will be described. First, the underfloor arrangement 4 is arranged on the floor base material 1 in a general-purpose manner.

Next, the curable composition is applied onto the metal sheet of the underfloor arrangement 4 using a general-purpose method. After that, the floor finishing material 2 is laid on the curable composition applied on the floor base material 1 so that the synthetic resin layer thereof is on the curable composition side.

Subsequently, the curable composition is cured over a predetermined period of time to cure the curable composition by the humidity in the air to form a cured product layer 3, and the cured product layer 3 is used to cure the metal of the underfloor arrangement 4. The floor structure A can be constructed by adhering and integrating the sheet and the floor finishing material 2.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

The following materials and compounds were used in Examples and Comparative Examples.
[Floor finishing material]
Floor finishing material A made by laminating and integrating a foam sheet as a shock absorbing sheet on the back surface of the floor finishing material body made of wood material (Asahi Woodtec product name "Live Natural Nedareless 145").
A spunbonded non-woven fabric containing polypropylene fibers and polyethylene fibers was laminated and integrated on the back surface of the foam sheet (the surface opposite to the floor finishing material main body).

[Underfloor arrangement and floor base material]
-Underfloor arrangement (a hot water mat with a metal sheet forming the upper surface and a synthetic resin layer made of polyethylene terephthalate laminated and integrated on the upper surface of the metal sheet, manufactured by Mitsubishi Plastics Co., Ltd.)
・ Floor base material (slate board conforming to JIS A5430, board molded by mixing concrete and fiber)

[Cursable composition]
Modified Silicone Resin A (Polymer having a polyoxyalkylene polymer whose main chain skeleton is a polyoxyalkylene polymer and having methyldimethoxysilyl as a hydrolyzable silyl group: average number of hydrolyzable silyl groups in one molecule: 2.1, molecule It has a hydrolyzable silyl group at the end of the chain, number average molecular weight: 9000, viscosity at 25 ° C.: 8000 mPa · s, Kaneka Co., Ltd. trade name "EST280").

-Modified silicone resin B (polymer having a polyoxypropylene main chain skeleton and a dimethoxysilyl group as a hydrolyzable silyl group: average number of hydrolyzable silyl groups in one molecule: 2, at the end of the molecular chain Has a hydrolyzable silyl group, number average molecular weight: 4500, viscosity at 25 ° C.: 400 mPa · s, Kaneka Co., Ltd. trade name “SAX015”)

-Crosslinkable silyl compound having a glycidyl group (3-glycidoxypropyltrimethoxysilane, trade name "KBM403" manufactured by Shin-Etsu Chemical Co., Ltd.)

-Filler (heavy calcium carbonate surface-treated with saturated fatty acid, product name "NCC2310" manufactured by Nitto Flourka Co., Ltd.)

A crosslinkable silyl compound having a functional group derived from an amino group (N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, trade name "KBM603" manufactured by Shin-Etsu Chemical Co., Ltd.).

-Curing catalyst [dibutyl tin bis (acetylacetonate), manufactured by Nitto Kasei Co., Ltd., product name "U-220H"]
-Hindered phenolic antioxidant (BASF product name "Irganox 1010")
・ Dehydrating agent (vinylsilane coupling agent, product name "KBM1003" manufactured by Shin-Etsu Chemical Co., Ltd.)

(Manufacturing of curable compositions A to J)
A modified silicone resin, a crosslinked silyl compound having a glycidyl group, a filler, a crosslinkable silyl compound having an amino group, and a dehydrating agent were supplied to a stirrer in predetermined amounts shown in Table 1 and mixed uniformly, and then mixed for 10 minutes. The foam was defoamed under reduced pressure.

Next, a predetermined amount of the curing catalyst and the hindered phenolic antioxidant shown in Table 1 were supplied to the stirrer and mixed uniformly, and then defoamed under reduced pressure for 10 minutes to cure the white paste. A sex composition was obtained.

The obtained curable composition was subjected to rotor No. 1 in an atmosphere of 23 ° C. using a Brookfield type viscometer. Viscosity under 5 and predetermined minute speed conditions (1 rotation per minute or 10 rotations per minute) was measured according to JIS K6833-1, and the results are shown in Table 1.

In Table 1, under a 23 ° C. atmosphere using a Brookfield type viscometer, the rotor No. 5 and the viscosity at a predetermined speed of 1 revolution per minute are described in the column of "Viscosity [1 revolution per minute]".

In Table 1, under a 23 ° C. atmosphere using a Brookfield type viscometer, the rotor No. 5 and the viscosity at a predetermined speed of 10 revolutions per minute are described in the column of "viscosity [10 revolutions per minute]".

In Table 1, under a 23 ° C. atmosphere using a Brookfield type viscometer, the rotor No. Viscosity under the conditions of 5 and 1 revolution per minute, and under a 23 ° C atmosphere using a Brookfield viscometer, rotor No. Ratio to viscosity under conditions of 5 and 10 revolutions per minute (Viscosity under conditions of rotor No. 5 and 1 revolution per minute under a 23 ° C atmosphere using a Brookfield viscometer / Brookfield viscometer) The viscosity under the conditions of rotor No. 5 and 10 rotations per minute under the atmosphere of 23 ° C. using the above (viscosity ratio) is described in the column of "viscosity ratio".

With respect to the obtained curable composition, the maximum stress of the cured product of the curable composition and the elongation at break were measured as described above, and the results are shown in Table 1.

(Examples 1 to 12, Comparative Examples 1 to 7)
The curable composition shown in Tables 2 and 3 was applied onto the metal sheet of the underfloor arrangement or the floor base material shown in Tables 2 and 3 using a combing iron conforming to JIS A5536.

Next, after laying the floor finishing material A on the curable composition, the curable composition is cured in an atmosphere of 23 ° C. and a relative humidity of 50% for 4 weeks, and the curable composition is placed in the air. It was cured by moisture to form a cured product, and the cured product was used to bond and integrate the metal sheet or floor base material of the underfloor arrangement and the floor finishing material A to construct a floor structure.

At the time of construction of the floor structure, the applicability of the curable composition was evaluated according to the following criteria. The peelability and adhesiveness of the obtained floor structure were measured as follows. The results are shown in Tables 2 and 3.

(Applicability of curable composition)
At the time of construction of the floor structure, the load when the curable composition was applied on the metal sheet of the underfloor arrangement or the floor base material was evaluated based on the following criteria.
◎ ・ ・ It was possible to apply without feeling tired from beginning to end.
○ ・ ・ I gradually felt tired from the start of construction, but it was possible to apply.
× ・ ・ The trowel was heavy at the start of construction, making application work difficult.

(Removability)
The state when the floor finishing material was peeled off from the floor structure was visually observed and evaluated based on the following criteria. The amount of the cured product described below means the amount of the cured product when the cured product constituting the floor structure is 100%.
◎ ・ ・ The amount of the cured material remaining on the floor base material or the underfloor arrangement was less than 10%, and the material of the foam sheet of the floor finishing material was not destroyed.
The amount of the cured material remaining on the floor base material or the underfloor arrangement was 10% or more and less than 30%, and the foam sheet of the floor finishing material was not destroyed.
× ・ ・ The amount of the cured product remaining on the floor base material or the underfloor arrangement is 30% or more, or
Material destruction occurred in the foam sheet of the floor finishing material.

(Adhesiveness)
For each Example and Comparative Example, a test piece was prepared according to the method described in JIS A5536 using the predetermined underfloor arrangement, floor base material, curable composition and floor finishing material shown in Table 2. ..

The obtained test piece was subjected to a tensile test using a tensile tester (manufactured by Instron) and evaluated based on the following criteria.
◎ ・ ・ No material fracture occurred in the foam sheet of the floor finishing material and no cohesive fracture occurred in the cured product layer.
○ ・ ・ The foamed sheet of the floor finishing material was broken, and the cured material layer was also aggregated and broken.
Δ ・ ・ Aggregation fracture occurred in the cured product layer.
× ... Peeling occurred at the interface between the cured product layer and the underfloor arrangement or the floor base material.

1 Floor base material 2 Floor finishing material
21 Floor finishing material body
22 Synthetic resin layer
23 Non-foamed sheet 3 Hardened layer 4 Underfloor arrangement A Floor structure

Claims (3)

Floor base material and
A floor finishing material laid on the floor base material and containing a synthetic resin layer laminated and integrated on the floor finishing material main body and the back surface of the floor finishing material main body.
A floor structure including a cured material layer that integrates the floor base material and the floor finishing material.
The cured product layer contains 100 parts by mass of a modified silicone resin containing a polymer having a dialkoxysilyl group as a hydrolyzable silyl group, 0.5 to 5 parts by mass of a crosslinkable silyl compound having a glycidyl group, and 60 to 200 parts of a filler. It contains a cured product of a curable composition containing 0 to 0.1 parts by mass of a crosslinkable silyl compound having a functional group derived from an amino group and a mass portion, and the maximum stress of the cured product is 1.0 MPa or more and at break. A floor structure characterized by an elongation of 80% or more. The viscosity of the curable composition was such that the rotor No. was measured in an atmosphere of 23 ° C. using a Brookfield viscometer. The viscosity under the conditions of 5 and 10 rpm was 100,000 mPa or less, and the rotor No. Viscosity under the conditions of 5 and 1 revolution per minute, and under a 23 ° C atmosphere using a Brookfield viscometer, rotor No. Ratio to viscosity under conditions of 5 and 10 rpm (Viscosity under conditions of rotor No. 5 and 1 revolution per minute under a 23 ° C atmosphere using a Brookfield viscometer / Brookfield viscometer) The floor structure according to claim 1 , wherein the viscometer (viscosity under the conditions of rotor No. 5 and 10 rotations per minute) is 3 or more in an atmosphere of 23 ° C. The process of applying the curable composition on the floor base material and
A step of laying a floor finishing material containing a synthetic resin layer laminated and integrated on the floor finishing material main body and the back surface of the floor finishing material main body on the curable composition.
A method for constructing a floor structure, which comprises a step of curing the curable composition to form a cured product layer and integrating the floor base material and the floor finishing material with the cured product layer.
The curable composition comprises 100 parts by mass of a modified silicone resin containing a polymer having a dialalkylated silyl group as a hydrolyzable silyl group, 0.5 to 5 parts by mass of a crosslinkable silyl compound having a glycidyl group, and 60 to 60 parts of a filler. A method for constructing a floor structure, which comprises 200 parts by mass and 0 to 0.1 parts by mass of a crosslinkable silyl compound having a functional group derived from an amino group.

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