JP2016210839A - Room temperature curable adhesive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a room temperature curable adhesive without generating solvent odor such as a solvent-based adhesive, having excellent adhesive power, excellent in coating property at low viscosity and capable of easily being constructed by using general purpose tools such as a combing trowel.SOLUTION: The room temperature curable adhesive contains 100 pts.mass of a polyoxyalkylene-based polymer having crosslinkable silyl group, number average molecular weight of 15000 to 50000, molecular weight distribution (weight average molecular weight (Mw)/number average molecular weight (Mn)) of 1.3 or less, 30 to 300 pts.mass of settleable calcium carbonate having BET specific surface area of 19 m/g or more and 1 to 10 pts.mass of an aminosilane coupling agent.SELECTED DRAWING: Figure 1

Description

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

  In a recent building, a floor structure in which a floor base material is laid on a floor base such as a concrete floor slab via a leg member, and a floor finishing material is bonded to the floor base material via an adhesive is adopted. ing.

  In particular, vinyl flooring materials such as polyvinyl chloride sheets are used as flooring materials for indoor passages in condominiums and hospitals, but solvent-based adhesives are mainly used for renovation, etc. When the floor finish is replaced, the solvent odor causes the residents to feel uncomfortable. 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 using a modified silicone adhesive (Patent Document 1).

JP 2000-38457 A

  However, when the above modified silicone adhesive is used, the viscosity is high, construction work is a problem, and sufficient peel adhesion strength cannot be expressed with respect to vinyl-based floor finish materials. Was insufficient.

  Further, Table 4-1 of JIS A5536: 2003 stipulates that the peel adhesion strength of an adhesive for floor finish is 20.0 N / 25 mm or more in a normal state and 10.0 N / 25 mm or more when immersed in water. However, conventional modified silicone adhesives do not satisfy these criteria.

  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, and does not emit a solvent odor like a solvent-based adhesive and has excellent adhesive strength. In addition, the present invention provides a room temperature curable adhesive that has a low viscosity and excellent coatability and can be easily applied using a general-purpose instrument such as a crimping iron.

The room temperature curable adhesive of the present invention has a crosslinkable silyl group, a number average molecular weight of 15,000 to 50,000, and a molecular weight distribution (weight average molecular weight (Mw) / number average molecular weight (Mn)) of 1.3 or less. It contains 100 parts by mass of a polyoxyalkylene polymer, 30 to 300 parts by mass of precipitated calcium carbonate having a BET specific surface area of 19 m ² / g or more, and 1 to 10 parts by mass of an aminosilane coupling agent. And

  In the room temperature curable adhesive, the room temperature curable adhesive has a viscosity at 23 ° C. of 10,000 to 70000 mPa · s.

  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, and the floor finishing material can be bonded and integrated with the floor base material. Even when the floor finishing material is a vinyl floor finishing material such as a polyvinyl chloride sheet, the floor finishing material can be firmly bonded and integrated on the floor base material.

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

  Furthermore, in the floor structure using the adhesive layer formed by curing the room temperature curable adhesive, it can be easily peeled off from the floor base material without damaging the floor base material. Therefore, the floor finishing material can be efficiently replaced when the floor finishing material is repaired.

1 is a schematic cross-sectional view of a floor structure that is a preferred embodiment of the present invention. It is a schematic cross section of the floor structure which is another preferred embodiment of the present invention.

  The room temperature curable adhesive of the present invention contains a polyoxyalkylene polymer, precipitated calcium carbonate, and an aminosilane coupling agent.

[Polyoxyalkylene polymer]
In the polyoxyalkylene polymer having a crosslinkable silyl group, the main chain has a general formula:-(R-O) _n- (wherein R represents an alkylene group having 1 to 14 carbon atoms, n is A polymer containing a repeating unit represented by the number of repeating units and a positive integer is preferred. 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 includes polyoxyethylene, polyoxypropylene, polyoxybutylene, polyoxytetramethylene, polyoxyethylene-polyoxypropylene copolymer, and polyoxypropylene-polyoxybutylene copolymer. Examples thereof include polymers, and polyoxypropylene is preferable.

  The polyoxyalkylene polymer has a crosslinkable silyl group. As the crosslinkable silyl group, for example, a condensation reaction may be performed by using a catalyst or the like, if necessary, in the presence of moisture or a crosslinker such as a silicon-containing group or silanol group having a hydrolyzable group bonded to a silicon atom. Refers to a group that yields

  Examples of the crosslinkable silyl group include dimethoxysilyl group, trimethoxysilyl group, methyldimethoxysilyl group, dimethylmethoxysilyl group, triethoxysilyl group, methyldiethoxysilyl group, dimethylethoxysilyl group and other alkoxysilyl groups, trichloro Examples include a silyl group to which a halogen such as a silyl group is bonded, 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, thereby imparting an appropriate adhesive force to the adhesive layer formed by curing the room temperature curable adhesive.

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

  The polyoxyalkylene polymer having a crosslinkable silyl group via a urethane bond at both ends of the polyoxyalkylene chain includes, for example, a prepolymer having hydroxyl groups at both ends of the polyoxyalkylene chain, 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-isocyanate methyltrimethoxysilane, 2-isocyanateethyltrimethoxysilane, 3-isocyanatepropyltrimethoxysilane, 3-isocyanatebutyltrimethoxysilane, 3-isocyanatepentyltril. Examples include methoxysilane and 1-isocyanatopropyltrimethoxysilane.

  In order to synthesize a polyoxyalkylene polymer having a crosslinkable silyl group via a urethane bond at both ends of the polyoxyalkylene chain, a prepolymer having a hydroxy group at both ends of the polyoxyalkylene chain and a crosslinkable silyl Mixing a compound having a group and an isocyanate group to obtain a mixture, and stirring the mixture to react the hydroxy group of the prepolymer with the isocyanate group of the compound to form a urethane bond. it can. Moreover, reaction can be accelerated | stimulated by stirring the said mixture, heating.

  A polyoxyalkylene polymer having a crosslinkable silyl group without a urethane bond at both ends of the polyoxyalkylene chain is, 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 that are reactive to a functional group, and then hydrolylating the resulting reaction product with hydrosilane having a hydrolyzable group. be able to.

  The number average molecular weight of the polyoxyalkylene polymer is 15000 to 50000, preferably 20000 to 40000. When the number average molecular weight of the polyoxyalkylene polymer is 50000 or less, the room temperature curable adhesive is excellent in its coatability. Further, when the number average molecular weight of the polyoxyalkylene polymer is 15000 or more, the mechanical strength, adhesive force and rubber elasticity of the adhesive layer obtained by curing the room temperature curable adhesive are excellent.

  The molecular weight distribution (weight average molecular weight (Mw) / number average molecular weight (Mn)) of the polyoxyalkylene polymer is 1.3 or less, preferably 1.2 or less. According to the polyoxyalkylene polymer having a molecular weight distribution of 1.3 or less, it is possible to improve the coating property and adhesive force 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 values converted to polystyrene measured by a GPC (gel permeation chromatography) method. Specifically, 6 to 7 mg of a polyoxyalkylene polymer is sampled, and after the collected polyoxyalkylene polymer is supplied to a test tube, 0.05% by mass of BHT (dibutylhydroxytoluene) is added to the test tube. An o-DCB (orthodichlorobenzene) solution containing is added to dilute the polyoxyalkylene polymer to a concentration of 1 mg / mL to prepare a diluted solution.

  The dilution liquid is shaken for 1 hour at a rotation speed of 25 rpm at 145 ° C. using a dissolution filter, and the polyoxyalkylene polymer is dissolved in an o-DCB solution containing BHT to obtain a measurement sample. . Using this measurement sample, the number average molecular weight and the weight average molecular weight of the polyoxyalkylene polymer can be measured by the GPC method.

The number average molecular weight and the weight average molecular weight in the polyoxyalkylene polymer can be measured, for example, with the following measuring apparatus and measurement conditions.
Product name "HLC-8121GPC / HT" manufactured by TOSOH
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 refractometer
Reference material: Polystyrene (Molecular weight: 500-8420000, manufactured by TOSOH)
Elution conditions: 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. When the viscosity of the polyoxyalkylene polymer is 200000 mPa · s or less, the room temperature curable adhesive is excellent in its coatability. Further, when the viscosity of the polyoxyalkylene polymer is 5000 mPa · s or more, the mechanical strength, adhesive strength and rubber elasticity of an adhesive layer obtained by curing a room temperature curable adhesive are excellent.

  In the present invention, the viscosity of the polyoxyalkylene polymer at 25 ° C. is determined according to JIS K1557, after being allowed to stand at 25 ° C. for 24 hours or more, and then using a BM viscometer under the condition of 12 rpm. Can be measured.

  A commercially available polyoxyalkylene polymer having a crosslinkable silyl group can be used. For example, as a polyoxyalkylene polymer having a main chain skeleton of polyoxypropylene, having a dimethoxysilyl group at the end of the main chain skeleton and having no urethane bond, for example, trade name “ESS4530 manufactured by Asahi Glass Co., Ltd.” Or the like.

[Precipitated calcium carbonate]
The room temperature curable adhesive forms an adhesive layer having an appropriate adhesive force by using the above-described polyoxyalkylene polymer in combination with precipitated calcium carbonate having a BET specific surface area of 19 m ² / g or more. can do. According to such an adhesive layer, the floor base material and the floor finishing material can be bonded and integrated, while an adhesive having good workability can be obtained. Furthermore, in the room temperature curable adhesive of the present invention, the above-mentioned adhesive layer is made flexible by using a combination of the above-described polyoxyalkylene polymer and precipitated calcium carbonate having a BET specific surface area of 19 m ² / g or more. It is possible to impart appropriate mechanical strength and appropriate rubber elasticity to the adhesive layer so as not to become too much. Precipitated calcium carbonate can be produced through a chemical reaction using, for example, limestone as a raw material.

The BET specific surface area of the precipitated calcium carbonate is preferably 19 m ² / g or more, more preferably 20 m ² / g or more. When the BET specific surface area of the precipitated calcium carbonate is 19 m ² / g or more, the room temperature curable adhesive has excellent adhesiveness and excellent coating properties. The BET specific surface area of the precipitated calcium carbonate is preferably 26 m ² / g or less, more preferably 23 m ² / g or less. When the BET specific surface area of the precipitated calcium carbonate is 26 m ² / g or less, the dispersibility of the precipitated calcium carbonate is improved, and the room temperature curable adhesive has excellent adhesiveness. The precipitated calcium carbonate preferably has a cubic shape. The BET specific surface area of the precipitated calcium carbonate is a value measured by a one-point method using a BET specific surface area meter. The BET specific surface area meter is commercially available, for example, from Yuasa Ionics under the trade name “NOVA2000”.

  The surface of the precipitated calcium carbonate is preferably surface-treated with a fatty acid, a fatty acid ester or a fatty acid metal salt. Surface-treated precipitated calcium carbonate can impart thixotropic properties to room temperature curable adhesives, improve handling properties of room temperature curable adhesives, and precipitate calcium carbonates aggregate together. Can be prevented.

  Examples of the fatty acid include caproic acid, caprylic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, alignic acid, behenic acid, lignoceric acid, serotic acid, montanic acid, Melicic acid, obsylic acid, carloleic acid, undecylenic acid, Lindellic acid, tuzuic acid, fizeteric acid, molistoleic acid, palmitoleic acid, petrothelic acid, oleic acid, elaidic acid, asclebic acid, vaccenic acid, gadoleic acid, gondoin Examples thereof include acid, celetic acid, erucic acid, brassic acid, ceracoleic acid, ximenoic acid, lumcitric acid, sorbic acid and linoleic acid, and lauric acid, myristic acid, palmitic acid, stearic acid and oleic acid are preferred.

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

  Examples of the fatty acid metal salt include sodium salt and potassium salt of the 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.

  In addition, since precipitated calcium carbonate is excellent in rubber elasticity of an adhesive layer obtained by curing a room temperature curable adhesive, it is treated in an aqueous alkali metal solution such as an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution. Also good.

  The pH of the precipitated calcium carbonate is preferably 9.3 or higher, and more preferably 9.5 or higher. When the pH of the precipitated calcium carbonate is 9.3 or more, the adhesive layer obtained by curing the room temperature curable adhesive has excellent rubber elasticity despite its low modulus. The pH of the precipitated calcium carbonate is preferably 12 or less, more preferably 10 or less. When the pH of the precipitated calcium carbonate is 12 or less, the adhesive layer obtained by curing the room temperature curable adhesive has excellent extensibility, and the adhesive layer has excellent peel adhesion strength.

  Precipitated calcium carbonate having a pH of 9.3 or more is commercially available from Maruo Calcium Co., Ltd. under the product names “Calfine 200M” and Shiraishi Calcium Co., Ltd. under the product names “CCR S-10” and “Viscolite-EL20”. ing.

  The pH of the precipitated calcium carbonate is measured as follows. After supplying 5 g of precipitated calcium carbonate to the Erlenmeyer flask, 100 mL of pure water was added to the Erlenmeyer flask and the mouth of the Erlenmeyer flask was closed, and then the mixed solution of precipitated calcium carbonate and pure water in the Erlenmeyer flask was kept for 10 seconds. And stir so as to be uniform. After finishing the stirring of the mixed solution in the Erlenmeyer flask, the mixed solution in the Erlenmeyer flask is allowed to stand for 30 minutes to prepare a slurry. After lightly stirring the slurry in the Erlenmeyer flask, the slurry is transferred to a beaker, and the pH of the slurry is measured in an atmosphere of 23 ° C. and 50% relative humidity using a glass electrode pH meter according to JIS Z 8802. This pH is taken as the pH of precipitated calcium carbonate.

  The content of precipitated 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 preferred. When the content of precipitated calcium carbonate is 30 parts by mass or more, the room temperature curable adhesive is excellent in adhesive strength. When the content of the precipitated calcium carbonate is 300 parts by mass or less, the coating property of the room temperature curable adhesive is improved.

[Aminosilane coupling agent]
The room temperature curable adhesive 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.

  Specific examples of aminosilane coupling agents include 3-aminopropyltrimethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropyltriethoxysilane, and N- (2-aminoethyl) -3-aminopropyltrimethoxy. 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 '-Bis- [3- (triethoxysilyl) propyl] hexamethylenediamine And the like. These aminosilane coupling agents may be used alone or in combination of two or more.

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

  The content of the aminosilane coupling agent in the room temperature curable adhesive improves the room temperature curable adhesive and improves the brittleness of the adhesive layer, or improves the adhesive strength of the room temperature curable adhesive. From this, it is 1-10 mass parts with respect to 100 mass parts of polyoxyalkylene-type polymers, and 1-5 mass parts is preferable.

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

  Examples of the silanol condensation catalyst include dioctyltin dineodecanoate, dibutyltin bis (triethoxysilicate), dibutyltin dilaurate, dibutyltin oxide, dibutyltin diacetate, dibutyltin phthalate, and bis (dibutyltin lauric acid) oxide. , Dibutyltin bis (acetylacetonate), dibutyltin bis (monoester malate), tin octylate, dibutyltin octoate, dioctyltin oxide, dibutyltin bis (triethoxysilicate), dioctyltin dilaurate, bis (dibutyltin bistri) Ethoxy silicate) oxide and organotin compounds such as dibutyltin oxybisethoxysilicate; organotitanium compounds such as tetra-n-butoxy titanate and 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-diazabicyclo [5.4.0] undec-7-ene, 1,5-diazabicyclo [4.3.0] noner 5- And cycloamidine compounds such as ene; dibutylamine-2-ethylhexoate and the like. Other acidic catalysts and basic catalysts can also be used as the silanol condensation catalyst. These silanol condensation catalysts may be used alone or in combination of two or more.

  Among these, as the silanol condensation catalyst, an organic tin compound is preferably exemplified, and a dioctyltin compound and dibutyltin bis (triethoxysilicate) are more preferably exemplified, and dioctyltin dineodecanoate, dibutyltin bis (triethoxy). Silicate) is particularly preferred.

  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 handling of the room temperature curable adhesive. 0.1-5 mass parts is preferable with respect to 100 mass parts of coalescence, and 0.5-3 mass parts is more preferable.

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

  Examples of 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. Of these, vinyltrimethoxysilane is preferable.

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

[Other additives]
The room temperature curable adhesive of the present invention may contain other additives such as antioxidants, ultraviolet absorbers, pigments, dyes, plasticizers and antisettling agents. 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 phenolic antioxidants, monophenolic antioxidants, bisphenolic antioxidants, and polyphenolic antioxidants. 0.1-20 mass parts is preferable with respect to 100 mass parts of polyoxyalkylene polymers, and, as for content of antioxidant in room temperature curable adhesive, 0.3-10 mass parts is more preferable.

  The viscosity at 23 ° C. of the room temperature curable adhesive is preferably 10,000 to 70000 mPa · s, and more preferably 30000 to 60000 mPa · s. When the viscosity at 23 ° C. of the room temperature curable adhesive is 10000 mPa · s or more, dripping of the room temperature curable adhesive is suppressed, and the room temperature curable adhesive has excellent coatability. When the viscosity at 23 ° C. of the room temperature curable adhesive is 70000 mPa · s or less, the room temperature curable adhesive has excellent coatability. In addition, the viscosity at 23 ° C. of the room temperature curable adhesive refers to a value measured under a condition of a rotation speed of 10 rpm using a B-type viscometer in accordance with JIS K6833.

  The room temperature curable adhesive is produced by a method in which a polyoxyalkylene polymer, precipitated calcium carbonate, an aminosilane coupling agent, and other additives as necessary are mixed in a predetermined weight ratio. be able to. Mixing is preferably performed under reduced pressure.

  Room temperature curable adhesives are used, for example, in the construction of floor structures. For example, the floor structure is constructed by bonding and integrating a floor finishing material on a floor base material laid on a floor base via an adhesive layer formed by curing a room temperature curable adhesive. 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 integrated with the floor base material, and the adhesive And a floor finish material laid on the adhesive layer and bonded and integrated with the adhesive layer.

  The floor structure uses an adhesive layer obtained by curing a room temperature curable adhesive containing the polyoxyalkylene polymer, the precipitated calcium carbonate, and the aminosilane coupling agent. The floor finishing material and the floor base material are each bonded and integrated with the adhesive layer. By using the adhesive layer in this way, the floor finish can be firmly bonded and integrated on the floor base material, while the floor finish is easily peeled off from the floor base material when the floor finish is repaired. It is possible to provide a floor structure that can.

  An example of a schematic cross-sectional view of a floor structure using a room temperature curable adhesive is shown in FIG. The floor structure shown in FIG. 1 includes 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 bonded and integrated with the floor base material 30. And a floor finish 20 laid on the adhesive layer 10 and bonded and integrated with the adhesive layer 10.

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

  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 via a spacer 2 as necessary. Next, after applying a room temperature curable adhesive onto the floor base material 30, the laminate is obtained by laying the floor finishing material 20 on the applied room temperature curable adhesive. Thereafter, by curing the room temperature curable adhesive, the adhesive layer 10 is formed, and the floor base material 30 and the floor finishing material 20 are bonded and integrated by the adhesive layer 10 to thereby form the floor structure. Construction is done. The curing of the room temperature curable adhesive is not particularly limited, but is performed, for example, by leaving the laminate.

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

  Examples of the members constituting the floor finishing material include plywood, medium density fiberboard (MDF), tile, polyvinyl chloride sheet, and stone. In the floor structure, a plurality of floor finishing materials are arranged without gaps.

  Examples of the members constituting the floor base material include plywood, particle board, tree joist, gypsum board, slate board, and concrete board. Among them, it is preferable to use a floor base material made of a wooden member such as plywood or particle board. When a floor finish is bonded and integrated with a floor base material made of wood using a conventional adhesive, it will be difficult to peel the floor finish from the floor base material. Forcibly peel the floor finish from the floor base material. Then, a problem that a part of the floor base material peels off together with the floor finish and damages the floor base material is particularly likely to occur. However, according to the above room temperature curable adhesive, even if the floor base material and the floor finish material are bonded and integrated using this, the floor finish material is not damaged when the floor finish material is repaired. Since it can be easily peeled off from the ground material, the room temperature curable adhesive of the present invention is preferably used for bonding a floor base material made of a wood member and a floor finish material.

  Furthermore, even when the floor finish is a vinyl-based floor finish such as a polyvinyl chloride sheet, the room temperature curable adhesive exhibits excellent adhesion to the floor finish. And the floor finish can be firmly bonded and integrated.

  Further, as the floor base material, as shown in FIG. 2, a vibration damping composite 40 in which a vibration damping sheet 42 and a base base material 43 are bonded and integrated by an adhesive layer 41 can also be used. 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 in a synthetic resin or asphalt. Examples of the high specific gravity material include inorganic powders such as barium sulfate, and metal powders such as lead and iron. Examples of the synthetic resin include polyethylene, polyurethane, and vinyl chloride. As a member which comprises a base substrate, a plywood, a particle board, Kineta, a gypsum board, a slate board, a concrete board etc. are mentioned, for example. Further, as the adhesive layer 41, a layer obtained by curing a conventionally known adhesive such as an epoxy-based adhesive or a urethane-based adhesive is used.

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

(Examples 1-4, Comparative Examples 1-6)
A polyoxyalkylene polymer having a main chain skeleton of polyoxypropylene and having a dimethoxysilyl group at the end of the main chain skeleton without a urethane bond (viscosity at 25 ° C .: 23000 mPa · s, number average molecular weight: 20000, molecular weight distribution (Mw / Mn): 1.16, product name “ESS4530” manufactured by Asahi Glass Co., Ltd.), main chain skeleton is polyoxypropylene, and dimethoxysilyl group without urethane bonds at both ends of the main chain skeleton Is bonded to a polyoxyalkylene polymer (viscosity at 25 ° C .: 6000 mPa · s, number average molecular weight Mn: 35000, molecular weight distribution (Mw / Mn): 1.51, product name “Syryl SAX720” manufactured by Kaneka Corporation) The main chain skeleton is polyoxypropylene and urethane bonds are interposed at both ends of the main chain skeleton. Polyoxyalkylene polymer having a dimethoxysilyl group bonded thereto (viscosity at 25 ° C .: 15000 mPa · s, number average molecular weight Mn: 18000, molecular weight distribution (Mw / Mn): 1.39, manufactured by Asahi Glass Co., Ltd. ESS2420 "), precipitated calcium carbonate (product name" CCR S-10 "manufactured by Shiraishi Calcium Co., Ltd., pH: 9.5, BET specific surface area: 21 m < ² > / g), precipitated calcium carbonate (manufactured by Maruo Calcium Co., Ltd., product name" Calfine 200M ", BET specific surface ^{area: 16m 2 / g pH: 9.5} ), precipitated calcium carbonate (Shiraishi calcium Co., Ltd. product name" CCR ", BET specific surface area: 18m ² /g,pH:8.9) Precipitated calcium carbonate (product name “Viscolite-EL20” manufactured by Shiraishi Calcium Co., Ltd., pH: 10.7, BET specific surface area: 11 ² / g), N-a-amino silane coupling agent (2-aminoethyl) -3-aminopropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd. product name "KBM-403"), dioctyltin Jineodeka as a silanol condensation catalyst Noate (product name “Neostan U-830” manufactured by Nitto Kasei), dibutyltin bis (triethoxysilicate) (product name “Neostan S-303” manufactured by Nitto Kasei), and vinyltrimethoxysilane (Shin-Etsu Chemical Co., Ltd.) as a dehydrating agent Product name “KBM-403”), hindered phenolic antioxidant (product name “IRGANOX (registered trademark) 1010” manufactured by BASF), and isononyl phthalate (manufactured by Sumitomo 3M) as plasticizers, respectively. The mixture was supplied to a stirrer so as to achieve the blending amount shown in FIG. A room temperature curable adhesive was produced by sealing the inside of the stirrer and mixing until uniform while reducing the pressure in the stirrer.

  The peel adhesion strength and the viscosity at 23 ° C. and 5 ° C. of the obtained room temperature curable adhesive were measured in the following manner, and the results are shown in Table 1.

(Normal peel 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). A sheet commercially available from Toli Co., Ltd. under the product name “Floor Room Plane Thickness 2 mm” was used as a flooring material for testing. A slate plate (JIS A5536 Table 7) having a thickness of 5 mm was used as the base material.

(Underwater immersion adhesion strength)
The underwater immersion peel strength (90 degree peel test) of the room temperature curable adhesive was measured according to JIS A5536 5.3.3 e) 2). A sheet commercially available from Takiron Co., Ltd. under the product name “Takistron NSC Tough Slip Type” was used as a test floor finish. A slate plate (JIS A5536 Table 7) having a thickness of 5 mm was used as the base material.

(viscosity)
The viscosity at 23 ° C. and 5 ° C. of the room temperature curable adhesive was measured using a B-type viscometer in accordance with JIS K6833 under the condition of a rotation speed of 10 rpm.

  According to the present invention, a floor structure can be constructed by firmly bonding a floor finishing material on a floor base material laid on a floor base.

DESCRIPTION OF SYMBOLS 1 Floor base 2 Spacer 10 Adhesive layer 20 Floor finishing material 30 Floor base material 40 Damping composite 41 Adhesive 42 Base material 43 Damping sheet

Claims (2)

100 parts by mass of a polyoxyalkylene polymer having a crosslinkable silyl group and having a number average molecular weight of 15,000 to 50,000 and a molecular weight distribution (weight average molecular weight (Mw) / number average molecular weight (Mn)) of 1.3 or less; A room temperature curable adhesive comprising 30 to 300 parts by mass of precipitated calcium carbonate having a BET specific surface area of 19 m ² / g or more and 1 to 10 parts by mass of an aminosilane coupling agent. 2. The room temperature curable adhesive according to claim 1, wherein the room temperature curable adhesive has a viscosity at 23 ° C. of 10,000 to 70000 mPa · s.

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