JP6712414B2 - Room temperature curable adhesive - Google Patents

Description

TECHNICAL FIELD The present invention relates to a room temperature curable adhesive for adhering a floor finish to a floor base material laid on a floor base.

In recent years, a floor structure is used in which a floor base material is laid on a floor base such as a concrete floor slab via leg members, and a floor finish material is bonded to this floor base material via an adhesive. ing.

In particular, vinyl floor finishing materials such as polyvinyl chloride sheets are used as floor finishing materials for indoor passages in condominiums and hospitals, but solvent-based adhesives are mainly used for reforming, etc. Replacing the floor finishing material makes the occupants feel uncomfortable due to the solvent odor. In some cases, there are problems such as rash of sick house syndrome.

As the adhesive used, a urethane solvent-based adhesive or a water-based adhesive is used. However, the urethane solvent-based adhesive has a strong solvent odor, and the water-based adhesive has poor water resistance, and has a problem in durability.

In order to prevent such a solvent odor, it is known to bond with a modified silicone adhesive (Patent Document 1).

JP 2000-38457 A

However, when the modified silicone-based adhesive is used, sufficient peeling adhesive strength to the vinyl flooring material cannot be expressed, and the adhesive performance is insufficient.

In addition, in recent years, along with the high durability of houses, it has become necessary to satisfy not only peeling adhesive strength but also tensile adhesive strength, and conventional modified silicone adhesives have not been able to cope with this. ..

The present invention is a room temperature curable adhesive for adhering a floor finishing material on a floor base material laid on a floor base, which does not generate a solvent odor like a solvent-based adhesive and has excellent peel adhesion. Provided is a room-temperature curable adhesive which has strength and tensile adhesive strength and can be easily applied by a general-purpose procedure such as a squeezing iron.

The room temperature curable adhesive of the present invention has 100 parts by mass of a polyoxyalkylene polymer having a crosslinkable silyl group and a number average molecular weight of 15,000 to 50,000 and a BET specific surface area of 6.5 to 14 m ² /g. 30 to 300 parts by mass of the heavy calcium carbonate and 1 to 10 parts by mass of the aminosilane coupling agent.

[Polyoxyalkylene polymer]
The main chain of the polyoxyalkylene polymer having a crosslinkable silyl group is represented by the general formula: —(R—O) _n — (wherein R represents an alkylene group having 1 to 14 carbon atoms, and n is A polymer containing a repeating unit represented by the number of repeating units, which is a positive integer. The main chain skeleton of the polyoxyalkylene polymer may be composed of only one type of repeating unit or may be composed of two or more types of repeating units.

The main chain skeleton of the polyoxyalkylene polymer, polyoxyethylene, polyoxypropylene, polyoxybutylene, polyoxytetramethylene, polyoxyethylene-polyoxypropylene copolymer, and polyoxypropylene-polyoxybutylene copolymer Examples thereof include polymers, and polyoxypropylene is preferable.

As the crosslinkable silyl group, for example, a condensation reaction by using a catalyst or the like, if necessary, in the presence of moisture or a crosslinking agent such as a silicon-containing group having a hydrolyzable group bonded to a silicon atom or a silanol group. Means a group that produces

Examples of the crosslinkable silyl group include dimethoxysilyl group, trimethoxysilyl group, dimethoxymethylsilyl group, dimethylmethoxysilyl group, triethoxysilyl group, diethoxymethylsilyl group, alkoxysilyl group such as dimethylethoxysilyl group, trichloro, and the like. Examples thereof include a silyl group having a halogen bonded thereto such as a silyl group, and a dimethoxysilyl group is preferable.

The polyoxyalkylene polymer may further have a urethane bond in addition to the crosslinkable silyl group. The urethane bond can impart polarity to the polyoxyalkylene polymer, and can thereby impart appropriate adhesive force to the adhesive layer formed by curing the room temperature curable adhesive.

The polyoxyalkylene polymer may have a crosslinkable silyl group at both ends of the polyoxyalkylene chain via urethane bonds, or may be crosslinkable at both ends of the polyoxyalkylene chain without interposing urethane bonds. It may have a silyl group.

The polyoxyalkylene polymer having a crosslinkable silyl group via urethane bonds at both ends of the polyoxyalkylene chain, for example, a prepolymer having a hydroxyl group at both ends of the polyoxyalkylene chain, and a crosslinkable silyl group and It is obtained by reacting with a compound having an isocyanate group.

Examples of the prepolymer having hydroxyl groups at both ends of the polyoxyalkylene chain include polyoxyethylene glycol, polyoxypropylene glycol, polyoxybutylene glycol, polyoxytetramethylene glycol, polyoxyethylene-polyoxypropylene glycol, and polyoxyethylene. Examples include propylene-polyoxybutylene glycol.

Examples of the compound having a crosslinkable silyl group and an isocyanate group include 1-isocyanatomethyltrimethoxysilane, 2-isocyanateethyltrimethoxysilane, 3-isocyanatepropyltrimethoxysilane, 3-isocyanatebutyltrimethoxysilane, and 3-isocyanatopentyltrisilane. Methoxysilane, 1-isocyanatopropyltrimethoxysilane and the like can be mentioned.

To synthesize a polyoxyalkylene polymer having a crosslinkable silyl group at both ends of a polyoxyalkylene chain via urethane bonds, a prepolymer having a hydroxy group at both ends of the polyoxyalkylene chain and a crosslinkable silyl group are synthesized. A compound having a group and an isocyanate group is mixed to obtain a mixture, and the mixture is stirred to react a hydroxy group of the prepolymer with an isocyanate group of the compound to form a urethane bond. it can. Moreover, the reaction can be promoted by stirring the above mixture while heating.

The polyoxyalkylene polymer having a crosslinkable silyl group at both ends of the polyoxyalkylene chain without interposing a urethane bond, for example, an oxyalkylene polymer having a functional group such as a hydroxyl group at the terminal, It is produced by reacting an organic compound having an active group and an unsaturated group which are reactive to a functional group, and then reacting the obtained reaction product with a hydrosilane having a hydrolyzable group to effect hydrosilylation. be able to.

The number average molecular weight of the polyoxyalkylene polymer is 15,000 to 50,000, preferably 20,000 to 40,000. When the number average molecular weight of the polyoxyalkylene polymer is 15,000 or more, the mechanical strength, peel adhesion strength, tensile adhesion strength and rubber elasticity of the adhesive layer formed by curing the room temperature curable adhesive are improved. .. When the number average molecular weight of the polyoxyalkylene polymer is 50,000 or less, the coatability of the room temperature curable adhesive is improved.

The molecular weight distribution (weight average molecular weight (Mw)/number average molecular weight (Mn)) of the polyoxyalkylene polymer is preferably 1.6 or less, more preferably 1.3 or less. The polyoxyalkylene polymer having a molecular weight distribution of 1.6 or less can improve the coatability and peel adhesion strength of the room temperature curable adhesive.

In the present invention, the number average molecular weight and the weight average molecular weight of the polyoxyalkylene polymer are polystyrene-converted values measured by the GPC (gel permeation chromatography) method. Specifically, 6 to 7 mg of a polyoxyalkylene polymer is collected, the collected polyoxyalkylene polymer is supplied to a test tube, and then 0.05% by mass of BHT (dibutylhydroxytoluene) is added to the test tube. And an o-DCB (ortho-dichlorobenzene) solution containing the above are added to dilute the polyoxyalkylene polymer so that the concentration of the polyoxyalkylene polymer becomes 1 mg/mL to prepare a diluted solution.

The polyoxyalkylene-based polymer was dissolved in an o-DCB solution containing BHT using a dissolution/filtering apparatus at 145° C. and a rotation speed of 25 rpm for 1 hour to shake the diluted solution to obtain a measurement sample. .. The number average molecular weight and the weight average molecular weight of the polyoxyalkylene polymer can be measured by the GPC method using this measurement sample.

The number average molecular weight and the weight average molecular weight of the polyoxyalkylene polymer can be measured, for example, by the following measuring device and measuring conditions.
Measuring device TOSOH product name “HLC-8121GPC/HT”
Measurement conditions Column: TSKgelGMHHR-H(20)HT x 3
TSKguardcolumn-HHR(30)HT x 1
Mobile phase: o-DCB 1.0 mL/min
Sample concentration: 1 mg/mL
Detector: Bryce type refractometer
Standard substance: Polystyrene (Molecular weight of TOSOH company: 500-8420000)
Elution condition: 145°C
SEC temperature: 145°C

The viscosity at 25° C. of the polyoxyalkylene polymer is preferably 5000 to 200000 mPa·s, more preferably 5000 to 100000 mPa·s, and particularly preferably 16000 to 60000 mPa·s. When the viscosity at 25° C. of the polyoxyalkylene polymer is 5000 mPa·s or more, the mechanical strength, adhesive force and rubber elasticity of the adhesive layer formed by curing the room temperature curable adhesive are improved. When the viscosity of the polyoxyalkylene polymer at 25° C. is 100,000 mPa·s or less, the coatability of the room temperature curable adhesive is improved.

In the present invention, the viscosity of the polyoxyalkylene polymer at 25° C. is in accordance with JIS K1557, and after leaving it at 25° C. for 24 hours or longer, the rotor NO. 4. It can be measured under the condition of rotation speed 12 rpm.

As the polyoxyalkylene polymer having a crosslinkable silyl group, commercially available products can be used. For example, as the polyoxyalkylene polymer having a main chain skeleton of polyoxypropylene and having a dimethoxysilyl group at the end of the main chain skeleton and having no urethane bond, for example, Kaneka Co., Ltd., trade name “Cyryl SAX710”, “Cyril SAX720”, “Cyril SAX725” and “Cyril SAX770”, and the product name “ESS4530” manufactured by Asahi Glass Co., Ltd. may be mentioned.

Examples of the polyoxyalkylene polymer having a main chain skeleton of polyoxypropylene and having a trimethoxysilyl group at the end of the main chain skeleton via a urethane bond include, for example, Momentive's trade name “SPUR+1015LM” and “ "SPUR+1050MM", and product names "Desmoseal S XP2458" and "Desmoseal SXP2636" manufactured by Covestrourethane Co., Ltd.

Examples of the polyoxyalkylene polymer having a main chain skeleton of polyoxypropylene and having a dimethoxysilyl group at the end of the main chain skeleton through a urethane bond include, for example, product names “GENIOSIL WP1” and “GENIOSIL WP2” manufactured by Wacker. , "GENIOSIL XB502", "GENIOSIL STP-E10", and "GENIOSIL STP-E30".

[Heavy calcium carbonate]
The room-temperature curable adhesive of the present invention has an appropriate adhesive force by using the above-mentioned polyoxyalkylene polymer in combination with heavy calcium carbonate having a BET specific surface area of 5 to 14 m ² /g. An adhesive layer can be formed. With such an adhesive layer, the floor base material and the floor finish material can be firmly adhered and integrated, and can be easily applied in a general-purpose manner. Further, in the room temperature curable adhesive of the present invention, by using the above-mentioned polyoxyalkylene polymer and heavy calcium carbonate having a BET specific surface area of 5 to 14 m ² /g in combination, the above adhesive layer It becomes possible to impart appropriate mechanical strength and appropriate rubber elasticity to the adhesive layer so that the adhesive does not become too soft, and it is possible to achieve both sufficient peel adhesion strength and tensile adhesion strength. ..

The BET specific surface area of the heavy calcium carbonate is 6.5 m ² /g or more, and preferably 7 m ² /g or more, from the viewpoint of improving the rigidity of the adhesive layer and the tensile adhesive strength. The BET specific surface area of the heavy calcium carbonate is 14 m ² /g or less, and preferably 13 m ² /g or less, from the viewpoint of improving the flexibility of the adhesive layer and improving the peel adhesion strength. The BET specific surface area of heavy calcium carbonate refers to a value measured according to JIS Z8830:2013. For example, the BET specific surface area of heavy calcium carbonate can be measured by a one-point method using a BET specific surface area meter commercially available from Yuasa Ionics under the trade name “NOVA2000”.

The surface of the ground calcium carbonate is preferably surface-treated with a fatty acid, a fatty acid ester or a fatty acid metal salt. The surface-treated heavy calcium carbonate can impart thixotropy to the room temperature curable composition, can improve the handleability of the room temperature curable composition, and cause the heavy calcium carbonate to aggregate with each other. Can be prevented.

Examples of the above-mentioned fatty acid include caproic acid, caprylic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, aline acid, behenic acid, lignoceric acid, cerotic acid, montanic acid, melicine. Acid, obsillic acid, caroleic acid, undecylenic acid, linderic acid, tzunic acid, fizeteric acid, molistoleic acid, palmitoleic acid, petroselinic acid, oleic acid, elaidic acid, asclebic acid, vaccenic acid, gadoleic acid, gondoic acid , Cetoleic acid, erucic acid, brassic acid, ceracoleic acid, xymenoic acid, lumecic acid, sorbic acid, linoleic acid and the like, with lauric acid, myristic acid, palmitic acid, stearic acid and oleic acid being preferred.

Examples of the fatty acid ester include stearyl stearate, lauryl stearate, stearyl palmitate, and lauryl palmitate.

Examples of the fatty acid metal salt include sodium salt and potassium salt of the above fatty acid, such as sodium salt of lauric acid, sodium salt of myristic acid, sodium salt of palmitic acid, sodium salt of stearic acid or sodium salt of oleic acid. Is preferred.

The content of heavy calcium carbonate in the room temperature curable adhesive is 30 to 300 parts by mass, preferably 50 to 250 parts by mass, and 60 to 150 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer. More preferable. When the content of the heavy calcium carbonate is 30 parts by mass or more, the peeling adhesive strength and the tensile adhesive strength of the adhesive layer can be improved, which is preferable. When the content of the heavy calcium carbonate is 300 parts by mass or less, the coatability of the room temperature curable adhesive is improved.

[Aminosilane coupling agent]
The room temperature curable adhesive of the present invention contains an aminosilane coupling agent. The aminosilane coupling agent means a compound containing a silicon atom having an alkoxy group bonded in one molecule and a functional group containing a nitrogen atom.

As the aminosilane coupling agent, specifically, 3-aminopropyltrimethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane. Silane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, N,N'-bis-[3-(trimethoxysilyl)propyl]ethylenediamine, N,N'-bis-[3-(tri Ethoxysilyl)propyl]ethylenediamine, N,N'-bis-[3-(methyldimethoxysilyl)propyl]ethylenediamine, N,N'-bis-[3-(trimethoxysilyl)propyl]hexamethylenediamine, N,N Examples include'-bis-[3-(triethoxysilyl)propyl]hexamethylenediamine and the like. These aminosilane coupling agents may be used alone or in combination of two or more kinds.

Among them, the aminosilane coupling agents include 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane. Ethoxysilane is preferred, and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane is more preferred.

The content of the aminosilane coupling agent in the room temperature curable adhesive is 1 to 10 parts by mass, and preferably 1 to 5 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer.
When the content of the aminosilane coupling agent is within the above range, the curability of the room temperature curable adhesive is improved and the brittleness of the adhesive layer is improved, or the adhesiveness of the room temperature curable adhesive is improved.

[Silanol condensation catalyst]
The room temperature curable adhesive of the present invention may contain a silanol condensation catalyst. The silanol condensation catalyst is a catalyst for promoting a dehydration condensation reaction between silanol groups formed by hydrolysis of the crosslinkable silyl group contained in the polyoxyalkylene polymer. The silanol group means a hydroxy group (≡Si—OH) directly bonded to a silicon atom.

Examples of silanol condensation catalysts include dibutyltin dilaurate, dibutyltin oxide, dibutyltin diacetate, dibutyltin phthalate, bis(dibutyltin lauric acid) oxide, dibutyltin bis(acetylacetonate), dibutyltin bis(monoester malate). , Tin octylate, dibutyltin octoate, dibutyltin bis(triethoxysilicate), bis(dibutyltin bistriethoxysilicate) oxide, dibutyltin oxybisethoxysilicate, dioctyltin bis(triethoxysilicate), dioctyltin oxide, dioctyltin Organotin compounds such as dilaurate; Tetra-n-butoxy titanate and organotitanium compounds such as tetraisopropoxy titanate; 1,5,7-Triazabicyclo[4.4.0]deca5-ene, 7- Methyl-1,5,7-triazabicyclo[4.4.0]deca5-ene, 1,8-diazabicyclo[5.4.0]undec-7-ene, 6-dibutylamino-1,8- Cycloamidine compounds such as diazabicyclo[5.4.0]undec-7-ene and 1,5-diazabicyclo[4.3.0]non-5-ene; and dibutylamine-2-ethylhexoate. .. Further, other acidic catalysts and basic catalysts can also be used as silanol condensation catalysts. These silanol condensation catalysts may be used alone or in combination of two or more kinds.

Among them, the silanol condensation catalyst is preferably an organic tin compound, more preferably a dioctyltin compound, and particularly preferably dioctyltin bis(triethoxysilicate).

The content of the silanol condensation catalyst in the room-temperature-curable adhesive adjusts the curing rate of the room-temperature-curable adhesive and improves the storage stability and handleability of the room-temperature-curable adhesive. The amount is preferably 0.1 to 5 parts by mass, more preferably 0.5 to 3 parts by mass with respect to 100 parts by mass of the combined product.

[Dehydrating agent]
The room temperature curable adhesive of the present invention preferably further contains a dehydrating agent. According to the dehydrating agent, it is possible to prevent the room temperature curable adhesive from being hardened by moisture contained in the air or the like when the room temperature curable adhesive is stored.

Dehydrating agents include silane compounds such as vinyltrimethoxysilane, dimethyldimethoxysilane, tetraethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, tetramethoxysilane, phenyltrimethoxysilane, and diphenyldimethoxysilane; and methyl orthoformate. And ester compounds such as ethyl orthoformate, methyl orthoacetate, and ethyl orthoacetate. These dehydrating agents may be used alone or in combination of two or more kinds. Of these, vinyltrimethoxysilane is preferable.

The content of the dehydrating agent in the room-temperature-curable adhesive is 0.5 to 20 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer, since the storage stability and the handleability of the room-temperature-curable adhesive are improved. Parts are preferable, 1 to 15 parts by mass is more preferable, and 1 to 5 parts by mass is particularly preferable.

[Other additives]
The room temperature curable adhesive of the present invention may contain other additives such as an antioxidant, an ultraviolet absorber, a pigment, a dye and an anti-settling agent. Of these, antioxidants and ultraviolet absorbers are preferred. The room temperature curable adhesive of the present invention preferably contains no solvent.

Examples of the antioxidant include hindered phenol-based antioxidants, monophenol-based antioxidants, bisphenol-based antioxidants, and polyphenol-based antioxidants. The content of the antioxidant in the room temperature curable adhesive is preferably 0.1 to 20 parts by mass, and more preferably 0.3 to 10 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer.

The viscosity of the room temperature curable composition of the present invention at 23° C. is preferably 20,000 to 70,000 mPa·s, more preferably 30,000 to 60,000 mPa·s. When the viscosity of the room temperature curable composition at 23° C. is 20,000 mPa·s or more, the sag of the room temperature curable adhesive is suppressed and the handleability is improved. When the viscosity of the room temperature curable composition at 23° C. is 70,000 mPa·s or less, the coatability of the room temperature curable adhesive is improved. The viscosity of the room temperature curable composition at 23° C. is a value measured using a B-type viscometer in accordance with JIS K6833 at a rotation speed of 10 rpm.

The room temperature curable adhesive of the present invention is produced by a method of mixing a polyoxyalkylene polymer, an inorganic filler and an aminosilane coupling agent, and other additives, if necessary, in respective predetermined weight ratios. Can be done by. Mixing is preferably performed under reduced pressure.

The room temperature curable adhesive of the present invention is used, for example, in constructing a floor structure. For example, a floor structure is constructed by integrally bonding a floor finish material on a floor base material laid on a floor base via an adhesive layer. The floor structure includes a floor base, a floor base material laid on the floor base, an adhesive layer formed on the floor base material and integrally bonded to the floor base material, and the adhesive layer. The floor covering is laid on the agent layer and is integrally bonded to the adhesive layer.

The floor structure of the present invention comprises a polyoxyalkylene polymer having a crosslinkable silyl group and a number average molecular weight of 15,000 to 50,000, a heavy calcium carbonate having a BET specific surface area of 6.5 to 14 m ² /g, and An adhesive layer obtained by curing a room temperature curable adhesive containing an aminosilane coupling agent is used. The floor finishing material and the floor base material are respectively bonded and integrated with the adhesive layer. By using the adhesive layer in this way, the floor finishing material can be firmly adhered and integrated onto the floor base material.

FIG. 1 shows an example of a schematic sectional view of a floor structure using the room temperature curable adhesive of the present invention. The floor structure shown in FIG. 1 is a floor base material 30 laid on a floor base 1 via a spacer 2, and an adhesive formed on the floor base material 30 and integrally bonded to the floor base material 30. It has a layer 10 and a floor covering 20 laid on the adhesive layer 10 and adhesively integrated with the adhesive layer 10.

In the floor structure of FIG. 1, in order to keep the floor base 1 and the floor base material 30 in a non-contact state, the floor base material 30 is laid on the floor base 1 via the spacer 2. However, the floor base material 30 may be directly laid on the floor base 1 without the spacer 2.

Construction of such a floor structure is performed as follows, for example. First, a floor base material 30 is laid on the floor base 1 with a spacer 2 interposed as necessary. Next, after applying the room temperature curable adhesive on the floor base material 30, the floor finishing material 20 is laid on the applied room temperature curable adhesive to obtain a laminate. After that, by curing the room temperature curable adhesive, the adhesive layer 10 is formed, and the floor base material 30 and the floor finish material 20 are bonded and integrated by the adhesive layer 10 to form a floor structure. Construction is done. Curing of the room temperature curable adhesive is not particularly limited, but is performed by, for example, leaving the laminate to stand.

The floor base is not particularly limited, and examples include earth concrete and concrete floor slabs.

Examples of the member constituting the floor finishing material include plywood, medium density fiberboard (MDF), tile, polyvinyl chloride sheet, polyvinyl chloride tile, and stone material. It should be noted that in the floor structure, a plurality of floor finishing materials are arranged without a gap therebetween.

Examples of the member constituting the floor base material include plywood, particle board, wood joists, gypsum board, slate board, and concrete board. Above all, it is preferable to use a floor base material made of a wood member such as plywood and particle board.

Further, as the floor base material, as shown in FIG. 2, it is also possible to use a vibration damping composite body 40 in which a vibration damping sheet 42 and a base material 43 are bonded and integrated by an adhesive layer 41. The floor structure shown in FIG. 2 has the same configuration except that the vibration damping composite 40 is used in place of the floor base material 30 in the floor structure shown in FIG.

Examples of the vibration damping sheet 42 include a sheet in which a high specific gravity substance is mixed with synthetic resin or asphalt. Examples of the high specific gravity substance include inorganic powder such as barium sulfate, and metal powder such as lead and iron. Further, examples of the synthetic resin include polyethylene, polyurethane and vinyl chloride. Examples of the member constituting the base substrate include plywood, particle board, wood joists, gypsum board, slate board, and concrete board. As the adhesive layer 41, a layer obtained by curing a conventionally known adhesive such as an epoxy adhesive or a urethane adhesive is used.

The room-temperature-curable adhesive of the present invention can be cured by moisture in the air or moisture contained in the floor finishing material and the floor base material to bond and integrate the floor finish material with the floor base material. Even when the floor finishing material is a vinyl type floor finishing material such as a polyvinyl chloride sheet, the floor finishing material can be firmly adhered and integrated onto the floor base material.

Since the room temperature curable adhesive of the present invention does not require a solvent, it does not have a solvent odor like a solvent-based adhesive. Therefore, when the room temperature curable adhesive is used, it has no solvent odor and is excellent in environmental hygiene. Further, no solvent odor is generated from the adhesive layer formed by curing the room temperature curable adhesive, and the structure using the room temperature curable adhesive is excellent in environmental hygiene.

It is a schematic cross section of the floor structure which is one suitable embodiment of the present invention. It is a schematic cross section of the floor structure which is other suitable Embodiment of this invention.

Hereinafter, the embodiments of the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

(Examples 1 to 6, Comparative Examples 1 to 6)
A polyoxyalkylene polymer in which the main chain skeleton is polyoxypropylene and dimethoxysilyl groups are bonded to both ends of the main chain skeleton without interposing urethane bonds (viscosity at 25° C.: 42000 mPa·s, number average molecular weight Mn: 26000, molecular weight distribution (Mw/Mn) 1.42, Kaneka product name “Cyryl SAX750”), the main chain skeleton is polyoxypropylene, and dimethoxysilyl without the urethane bond at the end of the main chain skeleton. Group-containing polyoxyalkylene polymer (viscosity at 25°C: 23000 mPa·s, number average molecular weight: 20,000, molecular weight distribution (Mw/Mn) 1.16, product name “ESS4530” manufactured by Asahi Glass Co., Ltd.), main chain skeleton Is polyoxypropylene and a polyoxyalkylene polymer in which dimethoxysilyl groups are bonded to both ends of the main chain skeleton without interposing urethane bonds (viscosity at 25° C.: 7,000 mPa·s, number average molecular weight Mn:10000). , Molecular weight distribution (Mw/Mn) 1.35, Kaneka product name "Cyryl EST280"), and the main chain skeleton is polyoxypropylene and has a dimethoxysilyl group at the end of the main chain skeleton through a urethane bond. Polyoxyalkylene polymer (viscosity at 25° C.: 800 mPa·s, number average molecular weight: 18,000, molecular weight distribution (Mw/Mn): 1.20, product name “GENIOSIL WP1” manufactured by Wacker), heavy carbonic acid Calcium (manufactured by Bihoku Powder Co., Ltd. product name “μ-POWDER3N”, BET specific surface area is 11 m ² /g), heavy calcium carbonate (manufactured by Bihoku Powder Co., Ltd. product name “μ-POWDER3S”, BET specific surface area is 8 0.5 m ² /g), heavy calcium carbonate (product name “NS200” manufactured by Nitto Koka Kabushiki Kaisha, BET specific surface area 1.2 m ² /g), heavy calcium carbonate (product name “Bihoku Kogaku Kogyo KK, white” P-10", BET specific surface area of 5.8 m ² /g), heavy calcium carbonate (Product name "Whiten P-30" manufactured by Bihoku Powder Co., Ltd., BET specific surface area of 3.4 m ² /g)" , Precipitated calcium carbonate (trade name "CCR" manufactured by Shiraishi Calcium Co., BET specific surface area 18 m ² /g), N-(2-aminoethyl)-3-aminopropyltrimethoxysilane as an aminosilane coupling agent (Shin-Etsu Chemical Kogyo Co., Ltd. product name “KBM-403”), dioctyltin bis(triethoxysilicate) as silanol condensation catalyst, dehydrating agent As vinyltrimethoxysilane (product name "KBM-403" manufactured by Shin-Etsu Chemical Co., Ltd.), a hindered phenolic antioxidant (product name "IRGANOX (registered trademark) 1010" manufactured by BASF), and isononyl phthalate (Plasticizer). Sumitomo 3M) was supplied to the stirrer so that the blending amounts shown in Table 1 were obtained. An adhesive was produced by sealing the inside of the stirrer and mixing under reduced pressure in the stirrer until uniform.

The room-temperature curable adhesive thus obtained was measured for normal peel adhesive strength, tensile adhesive strength and viscosity at 23° C. according to the following procedure or the above procedure, and the results are shown in Table 1.

(Normal peel adhesion strength)
The normal peel adhesive strength (90 degree peel test) of the room temperature curable adhesive was measured according to JIS A5536 5.3.3 e) 1). As the floor sheet for the test, a sheet commercially available from Tori under the product name “Floor worm plane thickness 2 mm” was used. A slate plate having a thickness of 5 mm (JIS A5536 Table 7) was used as a base material.

(Tensile bond strength)
The tensile adhesive strength of the room temperature curable adhesive was measured according to JIS A5536 5.3.2. As the test floor tile, a sheet commercially available from Tori under the product name "Royal Stone" was used. A slate plate having a thickness of 5 mm (JIS A5536 Table 7) was used as a base material.

According to the present invention, it is possible to construct a floor structure by firmly adhering a floor finishing material onto a floor base material laid on a floor base.

1 Floor Base 2 Spacer 10 Adhesive Layer 20 Floor Finishing Material 30 Floor Substrate 40 Damping Complex 41 Adhesive 42 Base Substrate 43 Damping Sheet

Claims (2)

100 parts by mass of a polyoxyalkylene polymer having a crosslinkable silyl group and a number average molecular weight of 15,000 to 50,000, and a heavy calcium carbonate having a BET specific surface area of 6.5 to 14 m ² /g 30 to 300 parts by mass Parts and 1 to 10 parts by mass of an aminosilane coupling agent, a room temperature curable adhesive characterized by the above-mentioned. The room temperature curable adhesive according to claim 1, further comprising a plasticizer.

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