JP7325077B2 - Curable composition - Google Patents

Description

The present invention relates to curable compositions.

A modified silicone-based curable composition containing a polyoxyalkylene polymer having a crosslinkable silyl group is safe because it does not generate toxic substances when cured, and has elasticity and durability after curing. It is widely used as an adhesive for floor structures and exterior walls.

Buildings these days are expected to undergo refurbishment and renovation in a few years, and construction adhesives are also required to be designed to be easily peeled off, taking into account renovations. Particularly in a floor structure in which a floor finishing material is bonded and integrated with an underfloor material via an adhesive, an adhesive that is easier to peel off is required because it is expected that the floor covering will be partially replaced due to stains or scratches.

However, when conventional adhesives such as epoxy-based adhesives, urethane-based adhesives, and modified silicone-based adhesives are used, the floor finishing material is firmly adhered to the underfloor material via the adhesive, and thus the floor cannot be In some cases, the finishing material could not be easily peeled off from the subfloor material. In such a case, if the floor finishing material is forcibly peeled off from the underfloor material, part of the underfloor material peels off together with the floor finishing material, resulting in damage to the underfloor material.

With respect to this problem, a method using a polyoxyalkylene polymer having three hydrolyzable groups bonded to terminal silicon atoms has been proposed as in Patent Document 1.

JP 2017-160368

However, the above method has a problem that the adhesion between the underfloor material and the floor finishing material is insufficient because the adhesive force is too weak.

INDUSTRIAL APPLICABILITY The present invention can be suitably used as an adhesive for bonding and integrating an underfloor material and a floor finishing material. To provide a curable composition which can be adhered and integrated with force and which can be easily peeled off from an adherend without damaging the adherend during repair.

The curable composition of the present invention comprises 100 parts by mass of a polyoxyalkylene polymer (A) having a dialkoxysilyl group,
A polyoxyalkylene polymer (B) having a trialkoxysilyl group;
It is characterized by containing 3 to 30 parts by mass of a dehydrating agent (C).

[Polyoxyalkylene polymer (A) having a dialkoxysilyl group]
The polyalkylene polymer (A) having a dialkoxysilyl group is a polymer having a dialkoxysilyl group represented by general formula (1) in its main chain. Incidentally, the polyoxyalkylene polymer (A) having a dialkoxysilyl group may be simply referred to as "polyoxyalkylene polymer (A)".
—SiR ¹ (OR ² ) ₂ (1)
Here, R ¹ represents a hydrogen atom or an optionally substituted alkyl group having 1 to 20 carbon atoms, and R ² represents an alkyl group having 1 to 6 carbon atoms.

The dialkoxysilyl group includes, for example, a dimethoxysilyl group, a methyldimethoxysilyl group, a diethoxysilyl group, a methyldiethoxysilyl group and the like, and a dimethoxysilyl group is preferred.

The polyoxyalkylene polymer (A) may have a dialkoxysilyl group at the end of its main chain or at a side chain, and preferably has a dialkoxysilyl group at the end of its main chain.

The main chain of the polyoxyalkylene polymer (A) is preferably a polymer containing repeating units represented by general formula (2).
—(R ³ —O) _n — (2)
(In the formula, R ³ represents an alkylene group having 1 to 14 carbon atoms, and n is the number of repeating units and is a positive integer.)

The main chain of the polyoxyalkylene polymer (A) may consist of one type of repeating unit, or may consist of two or more types of repeating units.

The main chain skeleton of the polyoxyalkylene polymer (A) includes polyoxyethylene, polyoxypropylene, polyoxybutylene, polyoxytetramethylene, polyoxyethylene-polyoxypropylene copolymer, and polyoxypropylene-poly Examples include oxybutylene copolymers, and polyoxypropylene is preferred.

The polyoxyalkylene polymer (A) preferably does not contain urethane bonds. If the polyoxyalkylene polymer (A) does not have a urethane bond, the viscosity of the resulting curable composition is suppressed from increasing at low temperatures such as in winter, and the coating properties and storage of the curable composition are improved. Stability can be improved.

The polyoxyalkylene polymer (A) preferably has a number average molecular weight of 8,000 to 50,000. When the polyoxyalkylene polymer (A) has a number average molecular weight of 8000 or more, it is possible to bond and integrate an adherend such as a floor finishing material to an adherend such as an underfloor material with sufficient adhesive strength. can. When the number average molecular weight of the polyoxyalkylene polymer (A) is 50000 or less, the coatability of the curable composition is improved.

The molecular weight distribution [weight average molecular weight (Mw)/number average molecular weight (Mn)] of the polyoxyalkylene polymer (A) is preferably 1.6 or less, more preferably 1.5 or less. When the molecular weight distribution is within the above range, an adherend such as a floor finishing material can be adhered and integrated with an adherend such as an underfloor material with sufficient adhesive strength.

In the present invention, the number average molecular weight and weight average molecular weight of the polyoxyalkylene polymer having a crosslinkable silyl group are values measured by GPC (gel permeation chromatography) and converted to polystyrene. Specifically, 6 to 7 mg of a polyoxyalkylene polymer is collected, the collected polyoxyalkylene polymer is supplied to a test tube, and 0.05% by mass of BHT (dibutylhydroxytoluene) is added to the test tube. A diluted solution is prepared by adding an o-DCB (ortho-dichlorobenzene) solution containing and diluting the concentration of the polyoxyalkylene polymer to 1 mg/mL.

Using a dissolution filtration device, the above-mentioned diluted solution is shaken at 145° C. and a rotation speed of 25 rpm for 1 hour to dissolve the polyoxyalkylene polymer in the o-DCB solution containing BHT to obtain a measurement sample. . Using this measurement sample, the number average molecular weight and weight average molecular weight of the polyoxyalkylene polymer can be measured by the GPC method.

The number-average molecular weight and weight-average molecular weight of the polyoxyalkylene-based polymer can be measured, for example, using the following measurement apparatus and measurement conditions.
Measuring device manufactured by TOSOH, trade 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 refractometer
Standard material: polystyrene (manufactured by TOSOH, molecular weight: 500-8420000)
Elution conditions: 145°C
SEC temperature: 145°C

A commercially available polyoxyalkylene polymer (A) having a dialkoxysilyl group in the molecule can be used. As the polyoxyalkylene polymer (A) having a dialkoxysilyl group in its molecule, any polyoxyalkylene polymer (A) can be used without particular limitation as long as it has a dialkoxysilyl group in its molecule. Since it is possible to impart appropriate flexibility and rubber elasticity to the cured product of the curable composition, the main chain skeleton is polyoxypropylene and the end of the main chain skeleton has a dimethoxysilyl group as a hydrolyzable silyl group. It is preferable to use a polyoxypropylene-based polymer having no urethane bond. Specific examples of commercial products having a polyoxypropylene main chain skeleton, having a dimethoxysilyl group as a hydrolyzable silyl group at the end of the main chain skeleton, and having no urethane bond include MS Polymer S203, Examples include MS Polymer S303, Cyryl SAT350, Cyryl SAT400, Cyryl EST280 (manufactured by Kaneka), Exester S2410, Exester S2420, and Exester S3630 (all manufactured by AGC).

[Polyoxyalkylene polymer (B) having a trialkoxysilyl group]
The polyoxyalkylene polymer (B) having a trialkoxysilyl group is a polymer having a trialkoxysilyl group represented by general formula (3) in the main chain. The polyoxyalkylene polymer (B) having a trialkoxysilyl group may be simply referred to as "polyoxyalkylene polymer (B)".
—Si(OR ⁴ ) ₃ (3)
Here, R ⁴ represents an alkyl group having 1 to 6 carbon atoms.

The trialkoxysilyl group includes, for example, a trimethoxysilyl group, a triethoxysilyl group and the like, and a trimethoxysilyl group is preferred.

The polyoxyalkylene polymer (B) may have a dialkoxysilyl group at the end of the main chain or at the side chain, and preferably has the dialkoxysilyl group at the end of the main chain.

The main chain of the polyoxyalkylene polymer (B) is preferably a polymer containing repeating units represented by general formula (4).
—(R ⁵ —O) _n — (4)
(In the formula, R ⁵ represents an alkylene group having 1 to 14 carbon atoms, and n is the number of repeating units and is a positive integer.)

The main chain of the polyoxyalkylene polymer (B) may consist of one type of repeating unit, or may consist of two or more types of repeating units.

The main chain skeleton of the polyoxyalkylene polymer (B) includes polyoxyethylene, polyoxypropylene, polyoxybutylene, polyoxytetramethylene, polyoxyethylene-polyoxypropylene copolymer, and polyoxypropylene-poly Examples include oxybutylene copolymers, and polyoxypropylene is preferred.

The polyoxyalkylene polymer (B) preferably has a number average molecular weight of 8,000 to 50,000. When the polyoxyalkylene polymer (B) has a number average molecular weight of 8000 or more, it is possible to bond and integrate an adherend such as a floor finishing material to an adherend such as a floor undercoat material with sufficient adhesive strength. can. When the number average molecular weight of the polyoxyalkylene polymer (B) is 50,000 or less, the coatability of the curable composition is improved.

The molecular weight distribution [weight average molecular weight (Mw)/number average molecular weight (Mn)] of the polyoxyalkylene polymer (B) is preferably 1.6 or less, more preferably 1.5 or less. When the molecular weight distribution is within the above range, an adherend such as a floor finishing material can be adhered and integrated with an adherend such as an underfloor material with sufficient adhesive strength.

A commercially available polyoxyalkylene polymer (B) having a trialkoxysilyl group in the molecule can be used. As the polyoxyalkylene polymer (B) having a trialkoxysilyl group in its molecule, any polyoxyalkylene polymer (B) can be used without particular limitation as long as it has a trialkoxysilyl group in its molecule. Since it is possible to impart appropriate flexibility and rubber elasticity to the cured product of the curable composition, the main chain skeleton is polyoxypropylene, and the terminal of the main chain skeleton is a trimethoxysilyl group as a hydrolyzable silyl group. It is preferable to use a polyoxypropylene-based polymer having Specific examples of commercially available products having a polyoxypropylene main chain skeleton and a trimethoxysilyl group as a hydrolyzable silyl group at the end of the main chain skeleton include MS Polymer MA451, Silyl SAX510 (manufactured by Kaneka Corporation), Exestar G3440ST (the above are manufactured by AGC) and the like can be mentioned.

As will be described later, the curable composition contains a large amount of 3 to 30 parts by mass of a dehydrating agent (C) with respect to 100 parts by mass of the polyoxyalkylene polymer (A), and a dialkoxysilyl group A polyoxyalkylene polymer (A) having a and a polyoxyalkylene polymer (B) having a trialkoxysilyl group are used in combination.

That is, the curable composition imparts brittleness to the cured product of the curable composition by containing a large amount of the dehydrating agent (C). On the other hand, in order to impart appropriate flexibility and rubber elasticity to the cured product of the curable composition, a polyoxyalkylene polymer (A) having a dialkoxylyl group and a polyoxyalkylene polymer having a trialkoxylyl group are used. It contains coalescence (B).

Thus, the curable composition contains the dehydrating agent (C) in a larger amount than usual, and the polyoxyalkylene polymer (A) having a dialkoxylyl group and the polyoxyalkylene polymer (A) having a trialkoxylyl group. By using the oxyalkylene polymer (B) in combination, the cured product of the curable composition has excellent tensile adhesive strength and moderate peel adhesive strength. Therefore, by using the curable composition, it is possible to bond and integrate an adherent such as a floor finishing material to an adherend such as an underfloor material with sufficient adhesive strength (adhesive fixability). When the adhesive is peeled off from the adherend, the adherend can be easily peeled off and removed without damaging the adherend (peelability).

Furthermore, the curable composition is obtained by using a predetermined amount of the dehydrating agent (C) and the polyoxyalkylene polymer (B) having a trialkoxysilyl group in combination to appropriately adjust the curing speed of the curable composition. It is controlled and can maintain an appropriate pot life at both low temperature in winter and high temperature in summer.

Moreover, the curable composition uses a predetermined amount of the dehydrating agent (C) together with the polyoxyalkylene polymer (B) having a trialkoxysilyl group. Therefore, in a state in which the adhesive is disposed on the adherend through the curable composition before curing, the curable composition has an appropriate cohesive force, and the adherend is placed on the adherend. While the adhesive can be fixed at a desired position, it is possible to easily adjust the position of the adherend on the adherend (initial adhesion).

The content of the polyoxyalkylene polymer (B) in the curable composition is preferably 1 to 30 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer (A), and further 2 to 20 parts by mass. 3 to 10 parts by mass is particularly preferred. When the content of the polyoxyalkylene polymer (B) is within the above range, the adherend and the adherend can be adhered and integrated with sufficient adhesive strength, and if necessary, adhesion An object can be peeled off and removed from an adherend without damaging the adherend.

[Dehydrating agent (C)]
The curable composition contains a dehydrating agent (C). Examples of the dehydrating agent (C) include silane compounds such as vinyltrimethoxysilane, dimethyldimethoxysilane, tetraethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, tetramethoxysilane, phenyltrimethoxysilane, and diphenyldimethoxysilane. and ester compounds such as methyl orthoformate, 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 preferred.

The content of the dehydrating agent (C) in the curable composition is 3 to 30 parts by mass and 4 to 20 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer (A) having a dialkoxysilyl group. is more preferable, 5 to 18 parts by mass is more preferable, and 8 to 15 parts by mass is particularly preferable. When the content of the dehydrating agent (C) is 3 parts by mass or more, the cured product of the curable composition is imparted with appropriate brittleness, thereby imparting excellent peelability to the cured product of the curable composition. can be done. When the content of the dehydrating agent (C) is 30 parts by mass or less, the curable composition has an appropriate cohesive force in a state in which the adhesive is disposed on the adherend via the curable composition before curing. It is possible to fix the adherend at a desired position on the adherend, and by imparting moderate brittleness to the cured product of the curable composition, the cured product of the curable composition Excellent releasability can be imparted.

[Inorganic filler]
The curable composition may contain inorganic fillers. By including an inorganic filler in the curable composition, the releasability of the curable composition is improved.

The curable composition uses both the inorganic filler and the polyoxyalkylene polymers (A) and (B) to bond and integrate the adherend and the adherend with sufficient adhesive strength. On the other hand, if necessary, the adherend can be peeled off and removed from the adherend without damaging the adherend.

Furthermore, the curable composition, by using an inorganic filler and polyoxyalkylene-based polymers (A) and (B) in combination, prevents the cured product of the curable composition from becoming too flexible and cures. Appropriate mechanical strength and rubber elasticity can be imparted to the product, and excellent adhesiveness and releasability can be imparted to the curable composition.

The inorganic filler is not particularly limited, and examples thereof include calcium carbonate, magnesium carbonate, calcium oxide, hydrous silicic acid, silicic anhydride, finely powdered silica, calcium silicate, titanium dioxide, clay, talc, carbon black, and glass. Examples include balloons, and calcium carbonate is preferred. The inorganic fillers may be used alone or in combination of two or more.

Preferred examples of calcium carbonate include heavy calcium carbonate and precipitated calcium carbonate.

Heavy calcium carbonate can be obtained, for example, by pulverizing natural calcium carbonate such as natural chalk (chalk), marble and limestone into fine powder.

Precipitated calcium carbonate can be produced, for example, by using limestone as a raw material and undergoing a chemical reaction. Examples of precipitated calcium carbonate include light calcium carbonate and colloidal calcium carbonate, with colloidal calcium carbonate being preferred. The primary particle size of light calcium carbonate is preferably 1 to 3 μm. Moreover, it is preferable that the precipitated calcium carbonate has a spindle shape or a columnar shape. The primary particle size of colloidal calcium carbonate is preferably 0.02 to 0.1 μm. The colloidal calcium carbonate preferably has a cubic shape.

As calcium carbonate, either one of ground calcium carbonate and precipitated calcium carbonate may be used, or both may be used. By using a combination of heavy calcium carbonate and precipitated calcium carbonate, thixotropy can be imparted to the curable composition, and uneven coating can be prevented.

In the curable composition, the ratio of the content of ground calcium carbonate to the content of precipitated calcium carbonate (content of ground calcium carbonate/content of precipitated calcium carbonate) is preferably 0.5-3. 7 to 2.5 are more preferred, and 0.8 to 2 are particularly preferred. When the ratio of the content of ground calcium carbonate to the content of precipitated calcium carbonate (content of ground calcium carbonate/content of precipitated calcium carbonate) is within the above range, the adhesive fixability and peelability of the curable composition are improved. You can balance both sexes.

Calcium carbonate may or may not be surface-treated on its surface. The surface-treated calcium carbonate and the surface-untreated calcium carbonate may be used alone or in combination of two or more. When the calcium carbonate is surface-treated, the surface treatment is preferably performed using a fatty acid, a fatty acid ester, or the like.

The content of the inorganic filler in the curable composition is preferably 100 to 500 parts by mass, more preferably 100 to 400 parts by mass, per 100 parts by mass of the polyoxyalkylene polymer (A). When the content of the inorganic filler is 100 parts by mass or more, the curable composition can be provided with sufficient adhesiveness and excellent releasability. When the content of the inorganic filler is 500 parts by mass or less, the rubber elasticity of the cured product of the curable composition can be improved, and the peelability of the curable composition can be improved. It is possible to suppress the viscosity before curing of the product and improve the coatability.

[Silane coupling agent]
The curable composition may further contain a silane coupling agent. By containing a silane coupling agent, excellent adhesiveness can be imparted to the curable composition.

Silane coupling agents include, for example, aminosilane coupling agents, epoxysilane coupling agents, isocyanatesilane coupling agents, mercaptosilane coupling agents, carboxysilane coupling agents, halosilane coupling agents, carbamatesilane coupling agents, Examples include alkoxysilane coupling agents and acid anhydride silane coupling agents. Among them, the synergistic effect with the polyoxyalkylene-based polymers (A) and (B) improves the adhesiveness and water resistance of the curable composition, so the combined use of an aminosilane coupling agent and an epoxysilane coupling agent is recommended. preferable.

Aminosilane coupling agents include 3-aminopropyltrimethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N- (2-aminoethyl)-3-aminopropylmethyldimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, N,N'-bis-[3-(trimethoxysilyl)propyl]ethylenediamine , N,N'-bis-[3-(triethoxysilyl)propyl]ethylenediamine, N,N'-bis-[3-(methyldimethoxysilyl)propyl]ethylenediamine, N,N'-bis-[3-( trimethoxysilyl)propyl]hexamethylenediamine, N,N'-bis-[3-(triethoxylyl)propyl]hexamethylenediamine and the like.

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

An epoxysilane coupling agent means a compound containing a silicon atom to which an alkoxy group is bonded in one molecule and a functional group containing an epoxy group. The epoxysilane coupling agent is not particularly limited, and examples thereof include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxy Propylethyldiethoxysilane, 2-(3,4 epoxycyclohexyl)ethyltrimethoxysilane, etc., and 3-glycidoxypropyltriethoxysilane are preferred.

The content of the silane coupling agent in the curable composition is preferably 0.5 to 20 parts by mass, more preferably 1 to 15 parts by mass, per 100 parts by mass of the polyoxyalkylene polymer (A). By setting the content of the silane coupling agent to 0.5 parts by mass or more, sufficient adhesiveness can be imparted to the cured product of the curable composition. By setting the content of the silane coupling agent to 20 parts by mass or less, the storage stability and handleability of the curable composition can be improved.

[Silanol condensation catalyst]
The curable composition may contain a silanol condensation catalyst. A silanol condensation catalyst is a catalyst for promoting a dehydration condensation reaction between silanol groups formed by hydrolysis of dialkoxysilyl groups and trialkoxysilyl groups of a 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 laurate) oxide, dibutyltin bis(acetylacetonate), dibutyltin bis(monoester ester). dibutyltin octoate, dioctyltin oxide, dibutyltin bis(triethoxysilicate), dioctyltin bis(triethoxysilicate), dioctyltin dilaurate, bis(dibutyltin bistriethoxysilicate) oxide, and dibutyltin Organotin compounds such as oxybisethoxysilicate; Organotitanium compounds such as tetra-n-butoxytitanate and tetraisopropoxytitanate; 1,5,7-triazabicyclo[4.4.0]deca-5-ene , 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-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]nona-5-ene and other cycloamidine compounds; dibutylamine-2-ethylhexoate, etc. is mentioned. 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, the silanol condensation catalyst is preferably an organic tin-based compound, more preferably dibutyltin bis(triethoxysilicate), since the curable composition can be uniformly cured.

The content of the silanol condensation catalyst in the curable composition is preferably 0.1 to 10 parts by mass, more preferably 0.5 to 6 parts by mass, based on 100 parts by mass of the polyoxyalkylene polymer (A). When the content of the silanol condensation catalyst is 0.1 parts by mass or more, the curability of the curable composition is improved. When the content of the silanol condensation catalyst is 10 parts by mass or less, the curable composition has excellent adhesiveness.

[Other additives]
The curable composition may contain other additives such as plasticizers, antioxidants, UV absorbers, light stabilizers, thixotropic agents, pigments, dyes, anti-settling agents and solvents. Among them, antioxidants are preferred.

Examples of antioxidants include hindered phenol antioxidants, monophenol antioxidants, bisphenol antioxidants, and polyphenol antioxidants, with hindered phenol antioxidants being preferred. The content of the antioxidant in the curable composition is preferably 0.1 to 20 parts by mass, more preferably 0.3 to 10 parts by mass, per 100 parts by mass of the polyoxyalkylene polymer (A).

The curable composition can be produced by a method of mixing the polyoxyalkylene polymer (A), the polyoxyalkylene polymer (B), the dehydrating agent (C), and optionally other additives. can. Mixing is preferably carried out under reduced pressure, and the curable composition is preferably stored in a sealed container in order to prevent reaction with moisture in the outside air.

Curable compositions are used, for example, in the construction of flooring structures. For example, a floor structure is constructed by bonding and integrating a floor finishing material onto an underfloor material laid on a floor base via a cured product made of a curable composition. The floor structure includes a floor base, an underfloor material laid on the floor base, a cured material formed on the underfloor material and bonded and integrated with the underfloor material, and the cured material. A floor covering overlying and adhesively integrated with the cured product.

Examples of members constituting floor finishing materials include wood materials such as plywood and medium density fiberboard (MDF: Medium Density Fiberboard), tiles, vinyl chloride sheets, and stone materials.

Examples of members constituting the underfloor material include plywood, particle board, wooden joists, gypsum board, slate board, and concrete board.

The curable composition is cured by the moisture contained in the adherend such as the floor finishing material and the underfloor material such as the adherend, and the adherend and the adherend are sufficiently bonded. It is possible to bond and integrate them with adhesive force.

The curable composition has an appropriate adhesive strength, so that the adherend can be peeled off and removed from the adherend during repair without damaging the adherend.

The curable composition can maintain an appropriate pot life at both low temperature in winter and high temperature in summer, and the distribution of the adhesive from the coating to the adherend regardless of the outside temperature. Work up to installation can be performed smoothly.

The curable composition has an appropriate cohesive force before curing, and can fix the adherend to a desired position on the adherend, while adjusting the position of the adherend on the adherend. If desired, the position of the adhesive can be easily adjusted.

EXAMPLES The aspects of the present invention will be described in more detail below with reference to Examples, but the present invention is not limited to these Examples.

The following raw materials were used in the preparation of the curable compositions of Examples and Comparative Examples.
[Polyoxyalkylene polymer (A) having a dialkoxysilyl group]
・ Polyoxyalkylene polymer having a dimethoxysilyl group at the end of the main chain skeleton (polyoxypropylene) (number average molecular weight: 10000, molecular weight distribution: 1.49, no urethane bond, manufactured by Kaneka under the product name “Silyl EST280")

[Polyoxyalkylene polymer (B) having a trialkoxysilyl group]
- A polyoxyalkylene polymer having a trimethoxysilyl group at the end of the main chain skeleton (polyoxypropylene) (number average molecular weight: 29000, molecular weight distribution: 1.3 to 1.4, manufactured by Kaneka under the product name "Silyl SAX510 ”)

[Dehydrating agent (C)]
・Vinyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd. product name “KBM-1003”)

[Inorganic filler]
・Heavy calcium carbonate (manufactured by Shiraishi Calcium Co., Ltd. product name “Whiten SB”)
・ Colloidal calcium carbonate (primary particle size: 0.05 μm, product name “Calfine 500” manufactured by Maruo Calcium Co., Ltd.)

[Silanol condensation catalyst]
・ Dibutyltin bis (triethoxysilicate) (product name “Neostan S-303” manufactured by Nitto Kasei Co., Ltd.)

(Examples 1 to 13, Comparative Examples 1 to 4)
The polyoxyalkylene polymer (A) having a dialkoxysilyl group, the polyoxyalkylene polymer (B) having a trialkoxysilyl group, the dehydrating agent (C), the inorganic filler and the silanol condensation catalyst are shown in Table 1. A curable composition was prepared by mixing until uniform in a sealed stirrer under reduced pressure.

In Table 1, the polyoxyalkylene polymer (A) having a dialkoxysilyl group is simply referred to as "polyoxyalkylene polymer (A)" and the polyoxyalkylene polymer (A) having a trialkoxysilyl group. B) is simply referred to as "polyoxyalkylene polymer (B)".

The initial adhesiveness, tensile adhesive strength (adhesive fixability), peelability and pot life of the obtained curable composition were measured in the following manner, and the results are shown in Table 1.

[Initial Adhesion]
The initial adhesion was evaluated using the method of JIS A5536 6.3.5 Floor Finishing Adhesive Slippage Variation. A mortar plate with a thickness of 8 mm was used as the test floor substrate. As the floor finishing material, a polymeric flooring material commercially available from Toli under the product name "Royal Stone" was used. The test was carried out in an environment of 23°C and a relative humidity of 50%, and the time from the start of coating of the curable composition until the floor finishing material was placed on the coated curable composition and crimped. was set to 30 minutes, and the distance traveled by the floor covering was measured 24 hours after the floor covering was pressed onto the curable composition. In Comparative Examples 2 to 4, the curable composition was completely cured 30 minutes after the application of the curable composition.

[Tensile adhesive strength (adhesive fixability)]
The normal tensile bond strength of the curable composition was measured according to JIS A5536 6.3.2 d)1). A sheet commercially available from Toli under the product name "Royal Stone" was used as a test floor tile. A mortar plate with a thickness of 20 mm was used as the base material. Evaluation was performed according to the following criteria based on the strength of JIS A5536 6.3.2 d)1).

Good: 0.5 N/mm ² or more and less than 1.5 N/mm ² .
Δ: 0.3 N/mm ² or more and less than 0.5 N/mm ² .
x: Less than 0.3 N/mm ² or 1.5 N/mm ² or more.

(Peelability)
A wood or mortar board was used as the underfloor material, and a polymer floor sheet commercially available from Toli under the product name "Cushion Floor CF Sheet" was used as the floor finishing material. It was measured in accordance with JIS A5536 6.3.3 Peel adhesion strength of adhesives for floor finishing, and the state of breakage was visually observed and evaluated according to the following criteria.

Good: Both the underfloor material and the floor finishing material were not destroyed.
Δ: The underfloor material was not destroyed, but the floor finishing material was destroyed.
x: The underfloor material was destroyed.

(pot life)
After applying the curable composition to the underfloor material (mortar plate) using a combed trowel in an environment of 35 ° C. or 5 ° C., floor finishing material (product name “Royal Stone” manufactured by Toli Co., Ltd.) is applied on the curable composition. ”) was placed. A hand roller was passed over the floor covering twice while applying a weight of 50N. The maximum time that the curable composition could be transferred to the floor finish was taken as the pot life.

If the visibility time is too short, the workability of the floor finishing material will be poor.

Claims (7)

100 parts by mass of a polyoxyalkylene polymer (A) having a dialkoxysilyl group;
1 to 30 parts by mass of a polyoxyalkylene polymer (B) having a trialkoxysilyl group and a molecular weight distribution of 1.5 or less;
A curable composition comprising 3 to 30 parts by mass of a dehydrating agent (C). 2. The curable composition according to claim 1, wherein the polyoxyalkylene polymer (A) has a dialkoxysilyl group at the terminal of the main chain skeleton. 3. The curable composition according to claim 1, wherein the polyoxyalkylene polymer (B) has a trialkoxysilyl group at the end of the main chain skeleton. 4. The curable composition according to any one of claims 1 to 3 , characterized by containing an inorganic filler. 5. The curable composition according to claim 4 , which contains 100 to 500 parts by mass of an inorganic filler with respect to 100 parts by mass of the polyoxyalkylene polymer (A) having a dialkoxysilyl group. 6. The curable composition according to any one of claims 1 to 5, wherein the polyoxyalkylene polymer (A) has a molecular weight distribution of 1.6 or less. 7. The curable composition according to any one of claims 1 to 6, which contains a silanol condensation catalyst containing an organic tin compound.