JP6509023B2 - Room temperature curable adhesive - Google Patents

Description

  The present invention relates to a room temperature curable adhesive for bonding floor coverings onto floor substrates laid on a floor base.

  In recent buildings, a floor base material is laid on a floor base such as a concrete floor slab via leg members, and a floor structure in which a floor finish is adhered to the floor base material via an adhesive is adopted. ing.

  In particular, vinyl floor coverings such as polyvinyl chloride sheets are used for floor coverings in indoor passages of condominiums and hospitals, but solvent-based adhesives are mainly used for renovations, etc. When the floor finish is replaced, the solvent smell makes the residents feel uncomfortable. In some cases, there are problems such as rash of sick house syndrome.

  As an adhesive to be used, a urethane solvent-based adhesive or a water-based adhesive is used. However, urethane solvent-based adhesives have a strong solvent odor, and water-based adhesives have poor water resistance and have problems with durability.

  In order to prevent such solvent odor, bonding using a modified silicone-based adhesive is known (Patent Document 1).

JP 2000-38457 A

  However, when the above modified silicone adhesive is used, the viscosity is high, the construction work is a problem, and a sufficient peel adhesion strength can not be developed with respect to a vinyl floor finish, and the adhesion performance is obtained. Was inadequate.

  In addition, Table 4-1 of JIS A5536: 2003 stipulates that the peel adhesion strength of the floor finish adhesive is 20.0 N / 25 mm or more in normal condition and 10.0 N / 25 mm or more in water immersion. However, conventional modified silicone adhesives did not meet these criteria.

  The present invention is a room temperature curable adhesive for bonding a floor finish on a floor base material laid on a floor base, which does not emit a solvent odor like a solvent based adhesive and has excellent adhesion. The present invention provides a room temperature curable adhesive which is low in viscosity and excellent in coatability and can be easily applied using a general purpose tool such as a comb.

The room temperature curable adhesive of the present invention has a crosslinkable silyl group and has 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 100 parts by mass of 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 I assume.

  The room temperature curable adhesive is characterized in that the viscosity at 23 ° C. of the room temperature curable adhesive is 10000 to 70,000 mPa · s.

  The room temperature curing adhesive of the present invention can be cured by moisture in the air or moisture contained in the floor finish and the floor base material, and the floor finish can be bonded and integrated to the floor base material. Even when the floor finish is a vinyl floor finish such as a polyvinyl chloride sheet, the floor finish can be firmly bonded and integrated onto the floor base.

  The room temperature curable adhesives of the present invention do not require a solvent and therefore do not have the solvent odor like solvent based adhesives. Therefore, there is no solvent odor at the time of using a room temperature curable adhesive, and the environmental hygiene is excellent. In addition, no solvent odor is generated from the adhesive layer formed by curing the room temperature curable adhesive, and the environment hygiene is excellent even when the structure using the room temperature curable adhesive is used.

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

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 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]
The main chain of the polyoxyalkylene polymer having a crosslinkable silyl group has a general formula:-(R-O) _n- (wherein R represents an alkylene group having 1 to 14 carbon atoms, and n is The polymer containing the repeating unit represented by the number of repeating units and it is a positive integer is mentioned preferably. The main chain skeleton of the polyoxyalkylene polymer may be composed of only one kind of repeating unit, or may be composed of two or more kinds of repeating units.

  Examples of the main chain skeleton of the polyoxyalkylene polymer include polyoxyethylene, polyoxypropylene, polyoxybutylene, polyoxytetramethylene, polyoxyethylene-polyoxypropylene copolymer, and polyoxypropylene-polyoxybutylene copolymer. A polymer etc. are mentioned and polyoxypropylene is preferable.

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

  As the crosslinkable silyl group, for example, an alkoxysilyl group such as dimethoxysilyl group, trimethoxysilyl group, methyldimethoxysilyl group, dimethylmethoxysilyl group, triethoxysilyl group, methyldiethoxysilyl group, dimethylethoxysilyl group, etc., trichloro The silyl group which halogen, such as a silyl group, couple | bonded is mentioned, A dimethoxy silyl 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, which can impart 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 at both ends of the polyoxyalkylene chain via the urethane bond, or may be crosslinkable without via the urethane bond at both ends of the polyoxyalkylene chain. It may have a silyl group.

  A polyoxyalkylene polymer having a crosslinkable silyl group at both ends of the polyoxyalkylene chain via a urethane bond is, 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 prepolymers having hydroxyl groups at both ends of the polyoxyalkylene chain include polyoxyethylene glycol, polyoxypropylene glycol, polyoxybutylene glycol, polyoxytetramethylene glycol, polyoxyethylene-polyoxypropylene glycol, and polyoxyethylene glycol. Propylene-polyoxybutylene glycol and the like can be mentioned.

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

  In order to synthesize a polyoxyalkylene polymer having a crosslinkable silyl group at both ends of the polyoxyalkylene chain via a urethane bond, a prepolymer having a hydroxy group at both ends of the polyoxyalkylene chain, and a crosslinkable silyl Mixing the 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. In addition, the reaction can be promoted by stirring while heating the above mixture.

  A polyoxyalkylene polymer having a crosslinkable silyl group without having 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 end. It is produced by reacting an organic compound having an active group and an unsaturated group reactive to a functional group, and then reacting the obtained reaction product with a hydrosilane having a hydrolysable group to hydrosilylate. be able to.

  The number average molecular weight of the polyoxyalkylene polymer is 15,000 to 50,000, and preferably 20,000 to 40,000. When the number average molecular weight of the polyoxyalkylene polymer is 50000 or less, the room temperature curable adhesive is excellent in the coatability. When the number average molecular weight of the polyoxyalkylene polymer is 15,000 or more, the mechanical strength, the adhesive strength and the rubber elasticity of the adhesive layer formed 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, the coatability and adhesion of the room temperature curable adhesive can be improved.

  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 GPC (gel permeation chromatography) method. Specifically, 6 to 7 mg of a polyoxyalkylene polymer is collected, and the collected polyoxyalkylene polymer is supplied to a test tube, and then 0.05 mass% of BHT (dibutylhydroxytoluene) is added to the test tube. A solution containing o-DCB (orthodichlorobenzene) is added to dilute the concentration of the polyoxyalkylene polymer to 1 mg / mL to prepare a diluted solution.

  The diluted solution is shaken at a rotational speed of 25 rpm for 1 hour at 145 ° C. using a dissolution filtration apparatus to dissolve the polyoxyalkylene polymer in an o-DCB solution containing BHT to form 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, with the following measuring device and measuring conditions.
Measuring device made by TOSOH, trade name "HLC-8121GPC / HT"
Measurement conditions Column: TSK gel GMH HR-H (20) HT x 3
TSKguard column-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 (TOSOH molecular weight: 500 to 8420000)
Elution conditions: 145 ° C
SEC temperature: 145 ° C

  The viscosity of the polyoxyalkylene polymer at 25 ° C. is preferably 5,000 to 200,000 mPa · s, and more preferably 5,000 to 100,000 mPa · s. When the viscosity of the polyoxyalkylene polymer is 200,000 mPa · s or less, the room temperature curable adhesive is excellent in the coatability. In addition, when the viscosity of the polyoxyalkylene polymer is 5000 mPa · s or more, the mechanical strength, the adhesive strength and the rubber elasticity of the adhesive layer formed by curing the room temperature curing adhesive are excellent.

  In the present invention, the viscosity of the polyoxyalkylene polymer at 25 ° C. is allowed to stand at 25 ° C. for 24 hours or more in accordance with JIS K 1557, and then the rotation speed is 12 rpm using a BM type viscometer. It 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, a dimethoxysilyl group at the end of the main chain skeleton and no urethane bond, for example, a product manufactured by Asahi Glass Co., Ltd. under the trade name "ESS 4530" And the like.

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

The BET specific surface area of the precipitated calcium carbonate is preferably 19 m ² / g or more, and 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 adhesion and excellent coatability. The BET specific surface area of precipitated calcium carbonate is preferably 26 m ² / g or less, and 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 curing adhesive has excellent adhesion. Preferably, precipitated calcium carbonate has a cubic shape. The BET specific surface area of 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 "NOVA 2000".

  The surface of precipitated calcium carbonate is preferably surface-treated with a fatty acid, fatty acid ester or fatty acid metal salt. The surface-treated precipitated calcium carbonate can impart thixotropy to a room temperature curable adhesive, can improve the handleability of the room temperature curable adhesive, and cause aggregation of precipitated calcium carbonates. Can be prevented.

  Examples of the above-mentioned fatty acids include caproic acid, caprylic acid, pelargonic acid, capric acid, undecanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, araenic acid, behenic acid, lignoceric acid, cerotic acid, montanic acid, Melisinic acid, obsic acid, carroreic acid, undecylenic acid, lindelic acid, thus acid, fizethelic acid, morestrenic acid, palmitoleic acid, petroselinic acid, oleic acid, oleic acid, asiendic acid, ascorbic acid, bacicic acid, gadolinic acid, gondin Examples thereof include acids, cetoleic acid, erucic acid, brassic acid, ceracolein acid, ximenic acid, lumenic acid, sorbic acid, linoleic acid, etc. Lauric acid, myristic acid, palmitic acid, stearic acid and oleic acid are preferable.

  Examples of the fatty acid ester 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 above fatty acid, 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 the adhesive layer obtained by curing a room-temperature curable adhesive, it is treated in an aqueous alkali metal solution such as an aqueous solution of sodium hydroxide or aqueous potassium hydroxide. It is also good.

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

  For example, precipitated calcium carbonate having a pH of 9.3 or more is commercially available from Maruo Calcium Co., Ltd. under the product name "Calfine 200M", and Shiroishi Calcium Co., Ltd. under the product names "CCR S-10" and "Viscolite-EL20". ing.

  The pH of precipitated calcium carbonate is measured as follows. After 5 g of precipitated calcium carbonate is supplied to the conical flask, 100 mL of pure water is added to the conical flask and the mouth of the conical flask is closed, and then the mixed solution of precipitated calcium carbonate and pure water in the conical flask is maintained for 10 seconds. Stir to be uniform. After completion of the stirring of the mixture in the Erlenmeyer, the mixture in the Erlenmeyer is allowed to stand for 30 minutes to prepare a slurry. After gently stirring the slurry in the Erlenmeyer flask, transfer the slurry to a beaker and measure the pH of the slurry under an atmosphere of 23 ° C. and 50% relative humidity using a glass electrode pH meter in accordance with JIS Z 8802. This pH is taken as the pH of precipitated calcium carbonate.

  The content of precipitated calcium carbonate in the room temperature curing 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 precipitated calcium carbonate is 30 parts by mass or more, the room temperature curable adhesive has excellent adhesion. When the content of the precipitated 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 contains an aminosilane coupling agent. The aminosilane coupling agent means a compound containing a silicon atom to which an alkoxy group is bonded in one molecule, and a functional group containing a nitrogen atom.

  Specifically, 3-aminopropyltrimethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropyltriethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxy as an aminosilane coupling agent 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] hexamethylene diamine And the like. These aminosilane coupling agents may be used alone or in combination of two or more.

  Among them, as aminosilane coupling agents, 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, and N- (2-aminoethyl) -3-aminopropyltriol Ethoxysilane is preferably mentioned, and N- (2-aminoethyl) -3-aminopropyltrimethoxysilane is more preferably mentioned.

  With regard to the content of the aminosilane coupling agent in the room temperature curable adhesive, the curability of the room temperature curable adhesive is improved to improve the brittleness of the adhesive layer, or the adhesion of the room temperature curable adhesive is improved. Therefore, the amount is 1 to 10 parts by mass, preferably 1 to 5 parts by mass, with respect to 100 parts by mass of the polyoxyalkylene polymer.

[Silanol condensation catalyst]
The room temperature curable adhesive may contain a silanol condensation catalyst. The silanol condensation catalyst is a catalyst for promoting the dehydration condensation reaction of silanol groups formed by hydrolysis or the like of the crosslinkable silyl group contained in the polyoxyalkylene polymer. In addition, a silanol group means the hydroxyl group ((triangle | delta) Si-OH) directly couple | bonded with the silicon atom.

  As a silanol condensation catalyst, for example, dioctyltin dineodecanoate, dibutyltin bis (triethoxy silicate), dibutyltin dilaurate, dibutyltin oxide, dibutyltin diacetate, dibutyltin phthalate, 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 bis tris Ethoxysilicates) and organotin-based compounds such as dibutyltin oxybisethoxy silicate; organo-titanium-based compounds such as tetra-n-butoxytitanate and tetraisopropoxytitanate; 1 5,7-Triazabicyclo [4.4.0] dec 5-ene, 7-methyl-1,5,7-triazabicyclo [4.4.0] dec 5-ene, 1,8-diazabicyclo [5 5.4.0] Undec-7-ene, 6-dibutylamino-1,8-diazabicyclo [5.4.0] undec-7-ene, 1,5-diazabicyclo [4.3.0] nona 5- Examples include cycloamidine compounds such as ene; dibutylamine-2-ethylhexoate and the like. 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.

  Among them, preferred examples of the silanol condensation catalyst include organotin compounds, dioctyltin compounds and dibutyltin bis (triethoxy silicate) are more preferable, and dioctyltin dineodecanoate and dibutyltin bis (triethoxy). Particular preference is given to silicates).

  The content of the silanol condensation catalyst in the room temperature curable adhesive adjusts the curing rate of the room temperature curable adhesive, and the storage stability and the handleability of the room temperature curable adhesive are improved. 0.1-5 mass parts is preferable with respect to 100 mass parts of union, and 0.5-3 mass parts is more preferable.

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

  As a dehydrating agent, 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. Among them, 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 because the storage stability and the handleability of the room temperature curable adhesive are improved. A part is preferable, 1-15 mass parts is more preferable, 1-5 mass parts is especially preferable.

[Other additives]
The room temperature curable adhesives of the present invention may contain other additives such as antioxidants, UV absorbers, pigments, dyes, plasticizers and antisettling agents. Among them, antioxidants and ultraviolet light absorbers are preferably mentioned. In the room temperature curable adhesive of the present invention, it is preferred that the solvent is not contained.

  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.

  10000-70 000 mPa * s is preferable and, as for the viscosity at 23 degrees C of a room temperature curable adhesive, 30000-60000 mPa * s is more preferable. When the viscosity at 23 ° C. of the room temperature curable adhesive is 10000 mPa · s or more, the dripping of the room temperature curable adhesive is suppressed, and the room temperature curable adhesive has excellent coatability. 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 viscosity at 23 ° C. of the room temperature curable adhesive is a value measured under the condition of 10 rpm using a B-type viscometer according to JIS K6833.

  The room temperature curing adhesive is produced by mixing a polyoxyalkylene polymer, a precipitated calcium carbonate and an aminosilane coupling agent, and, if necessary, other additives in a predetermined weight ratio. be able to. The 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 finish on a floor base material laid on a floor base via an adhesive layer formed by curing a room temperature curing 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 adhesively integrated with the floor base material, and the bonding. A floor covering is disposed on the agent layer and adhesively integrated with the adhesive layer.

  The floor structure uses an adhesive layer formed by curing a room temperature curable adhesive containing the polyoxyalkylene polymer, the precipitated calcium carbonate and the aminosilane coupling agent. The floor finish and the floor base are adhesively integrated with the adhesive layer, respectively. By using the adhesive layer in this manner, the floor finish can be firmly bonded and integrated onto the floor base, while the floor finish can be easily peeled off from the floor base when the floor finish is being refurbished. It is possible to provide a floor structure that can be

  An example of a schematic cross-sectional view of a floor structure in which a room temperature curable adhesive is used is shown in FIG. The floor structure shown in FIG. 1 is an adhesive which is formed on the floor base material 30 laid on the floor base 1 via the spacer 2 and is formed on the floor base material 30 and is adhesively integrated with 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 30 in a non-contact state, the floor base 30 is laid on the floor base 1 via the spacer 2. However, the floor base material 30 may be laid directly on the floor base 1 without the spacer 2.

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

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

  Examples of members constituting the floor covering include plywood, medium density fiberboard (MDF), tiles, polyvinyl chloride sheets, and stone materials. In the floor structure, a plurality of floor coverings are arranged without gaps.

  As a member which comprises a floor base material, a plywood, particle board, a wood joist, a plaster board, a slate board, a concrete board etc. are mentioned, for example. Among them, it is preferable to use a floor base material made of wood members such as plywood and particle board. When the floor finish is adhered and integrated to the floor base made of wood members by a conventional adhesive, it becomes difficult to peel the floor finish from the floor base, and the floor finish is forcibly peeled from the floor base If this is done, a problem is likely to occur particularly that part of the floor base material peels off along with the floor finish to damage the floor base material. However, according to the above-mentioned room temperature curing 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 while the floor finish material is being repaired, and the floor finish material is under the floor. The room temperature curable adhesive of the present invention is preferably used to bond a floor base material made of a wood member to a floor finish, since it can be easily peeled off from the base material.

  Furthermore, even when the floor finish is a vinyl floor finish such as a polyvinyl chloride sheet, the room temperature curable adhesive exhibits excellent adhesion to the floor finish, so the floor base material And the floor covering material can be firmly adhered and integrated.

  Further, as the floor base material, as shown in FIG. 2, it is also possible to use a damping composite 40 in which the damping sheet 42 and the base substrate 43 are bonded and integrated by the adhesive layer 41. The floor structure shown in FIG. 2 has the same configuration as that of the floor structure shown in FIG. 1 except that a damping composite 40 is used in place of the floor base material 30.

  Examples of the 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 substance include inorganic powders such as barium sulfate, and metal powders such as lead and iron. Moreover, polyethylene, polyurethane, vinyl chloride etc. are mentioned as a synthetic resin. As a member which comprises a foundation | substrate base material, a plywood, particle board, a wood joist, a gypsum board, a slate board, a concrete board etc. are mentioned, for example. Further, as the adhesive layer 41, a material obtained by curing a conventionally known adhesive such as an epoxy adhesive or a urethane adhesive is used.

  EXAMPLES The embodiments of the present invention will be described in more detail by way of examples, but 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 without having a urethane bond (viscosity at 25 ° C .: 23000 mPa · s, number average molecular weight: 20000, molecular weight distribution (Mw / Mn): 1.16, manufactured by Asahi Glass Co., Ltd., product name “ESS 4530”), the main chain skeleton is polyoxypropylene and dimethoxysilyl group without using urethane bond at both ends of the main chain skeleton (A viscosity at 25 ° C .: 6000 mPa · s, number average molecular weight Mn: 35000, molecular weight distribution (Mw / Mn): 1.51, Kaneka Co., Ltd. product name “Syryl SAX720”) The main chain skeleton is polyoxypropylene and through urethane bonds at both ends of the main chain skeleton (A viscosity at 25 ° C .: 15,000 mPa · s, number average molecular weight Mn: 18,000, molecular weight distribution (Mw / Mn): 1.39, manufactured by Asahi Glass Co., Ltd.) ESS 2420 "), precipitated calcium carbonate (product name" CCR S-10 "manufactured by Shiraishi Calcium, pH: 9.5, BET specific surface area: 21 m ² / g), precipitated calcium carbonate (product manufactured by Maruo Calcium Co., Ltd.) 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) Precipitable calcium carbonate (manufactured by Shiraishi Calcium Co., Ltd. Product name "Viscolite-EL20", 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 Co., Ltd., dibutyltin bis (triethoxy silicate) (product name "Neostan S-303" manufactured by Nitto Kasei Co., Ltd.), 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 Co., Ltd.) as a plasticizer; It supplied to the stirrer so that it might become the compounding quantity shown to. A room temperature curable adhesive was produced by sealing the inside of the stirrer and mixing under reduced pressure in the stirrer until uniform.

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

(Normal state peel adhesion strength)
The normal-state peel adhesion strength (90 ° peel test) of the room temperature curable adhesive was measured in accordance with JIS A5536 5.3.3 e) 1). A sheet commercially available from Tori under the product name “Floor Reusable Plane Thickness 2 mm” was used as a floor finish for testing. A 5 mm thick slate plate (JIS A5536 Table 7) was used as the base material.

(In-water immersion adhesion strength)
The immersion adhesion strength (90 degree peel test) of the room temperature curable adhesive in water was measured in accordance with 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 floor finish for testing. A 5 mm thick slate plate (JIS A5536 Table 7) was used as the base material.

(viscosity)
The viscosities at 23 ° C. and 5 ° C. of the room temperature curable adhesive were measured using a B-type viscometer according to JIS K 6833 under the condition of 10 rpm.

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

Reference Signs List 1 floor base 2 spacer 10 adhesive layer 20 floor finish 30 floor base 40 damping composite 41 adhesive 42 base base 43 damping sheet

Claims (1)

A room temperature curable adhesive for bonding floor coverings onto floor substrates laid on a floor base,
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 And 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 the viscosity at 23 ° C. is 10000 to 70,000 mPa · s A room temperature curable adhesive characterized in that.

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