JP6347890B1 - Curable composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curable composition for adhering a floor finishing material on a floor base material laid on a floor base, having a low viscosity at the time of coating and excellent coating even in winter And can be laid beautifully without deforming the floor finish, and can be firmly laid and integrated on the construction surface without creating a gap after laying on the floor finish. A curable composition is provided. SOLUTION: The curable composition of the present invention comprises a polyoxyalkylene polymer (A) having a hydrolyzable silyl group having a number average molecular weight of 8000 to 30000, and a hydrolyzate having a number average molecular weight of 3000 to 6000. A polyoxyalkylene polymer (B) having a decomposable silyl group, surface-treated calcium carbonate (C), heavy calcium carbonate (D) not surface-treated, and silanol condensation catalyst (E) It is characterized by containing. [Selection] Figure 1

Description

  The present invention relates to a curable composition for bonding a floor finishing material 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. 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).

  However, since the cured product of the modified silicone-based adhesive is flexible, a gap is generated between the floor finishing materials adjacent to each other when the floor finishing material shrinks with a change in the temperature of the atmosphere. There is a problem of generating “intervals”.

  On the other hand, if the floor finish material is damaged, peel off the damaged floor finish material from the floor base material, bond the new floor finish material to the floor base material, and replace the floor finish material. As a result, floor finishing materials have been renovated. Furthermore, a new floor finishing material is further pasted on the existing floor finishing material.

  However, when performing such construction, there was a problem that the construction could not be performed well if the viscosity of the adhesive was high. In recent years, there has been a demand for improvement in workability in winter due to lack of skill of the installer, and a reduction in the viscosity of the adhesive is desired.

  In addition, when a new floor finish is pasted on the existing floor finish, the new floor finish should be used to prevent the newly formed floor from becoming as high as possible compared to the existing floor. It is formed thinner than the floor finishing material laid directly on the material.

  Accordingly, the new floor finish material is more likely to shrink with the change in the temperature of the atmosphere, and the above-described gap is more likely to occur.

  In addition, when laying new floor finish on existing floor finish, the adhesive should be applied in a bead shape (straight) at regular intervals on the back of the new floor finish or on the existing floor finish. A new floor finish is placed on the existing floor finish.

  At this time, if the viscosity of the adhesive is high, the adhesive does not flow between the new floor finish and the existing floor finish, and the new floor finish is partially supported by the adhesive. . As described above, the new floor finish has a problem that it is easily deformed due to its thin thickness, and irregularities are generated on the newly constructed floor surface and the appearance is impaired.

  In recent years, floor heating has become widespread, and since the floor finishing material is heated during use, there is a problem that the adhesiveness of the conventional modified silicone adhesive is insufficient.

JP 2000-38457 A

  The present invention is a curable composition 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 a viscosity at the time of coating. In addition, it can be laid beautifully without deforming the floor finish even when it is laid in a thin floor finish that has excellent coating properties even in winter. Even if it exists, the curable composition which can be laid and integrated firmly on a construction surface (existing floor finishing material or floor base material) without producing a gap after laying is provided.

The curable composition of the present invention comprises:
A polyoxyalkylene polymer (A) having a hydrolyzable silyl group having a number average molecular weight of 8000 to 30,000,
A polyoxyalkylene polymer (B) having a hydrolyzable silyl group having a number average molecular weight of 3000 to 6000,
Surface treated calcium carbonate (C);
Heavy calcium carbonate (D) which is not surface-treated;
Containing a silanol condensation catalyst (E)

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

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

  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, dimethoxymethylsilyl group, dimethylmethoxysilyl group, triethoxysilyl group, diethoxymethylsilyl group, dimethylethoxysilyl group and other alkoxysilyl groups, trichloro Examples include a silyl group having a halogen bonded thereto such as a silyl group, and a dimethoxysilyl group is preferable.

  It is preferable that the polyoxyalkylene polymer (A) does not contain a urethane bond. If the polyoxyalkylene polymer (A) has a urethane bond, the viscosity of the resulting curable composition may increase at low temperatures such as in winter, which may reduce coating properties and storage stability. is there.

  The polyoxyalkylene polymer (A) having a crosslinkable silyl group without a urethane bond at both terminals of the polyoxyalkylene chain is, for example, a polyoxyalkylene polymer having a functional group such as a hydroxyl group at the terminal. The compound is reacted with an organic compound having an active group and an unsaturated group that are reactive to the functional group, and then hydrosilylated by reacting the resulting reaction product with hydrosilane having a hydrolyzable group. Can be manufactured.

  The number average molecular weight of the polyoxyalkylene polymer (A) is 8000 to 30000, preferably 9000 to 20000, and more preferably 9500 to 15000. When the number average molecular weight of the polyoxyalkylene polymer (A) is 30000 or less, the viscosity at the time of coating of the curable composition is low, and the floor has excellent coating properties even in winter and is thin. Even when laying the finishing material, it can be laid beautifully without deforming the floor finishing material. Moreover, the adhesive strength of the hardened | cured material of a curable composition improves that the number average molecular weight of a polyoxyalkylene type polymer (A) is 8000 or more.

  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, and particularly preferably 1.3 or less. preferable. According to the polyoxyalkylene polymer (A) having a molecular weight distribution of 1.6 or less, the viscosity at the time of coating of the curable composition is low, and it has excellent coating properties even in winter and has a thickness of Even when laying a thin floor finish, the floor finish can be beautifully laid without being deformed. Furthermore, the adhesive strength of the cured product of the curable composition is improved.

  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

  A commercially available polyoxyalkylene polymer (A) containing a hydrolyzable silyl group can be used. The polyoxyalkylene polymer (A) is not particularly limited as long as it is a polyoxyalkylene polymer (A) containing a hydrolyzable silyl group. Since it is a liquid substance before curing and forms good rubber elasticity after curing, the main chain skeleton is polyoxypropylene, and has a dimethoxysilyl group as a hydrolyzable silyl group at the end of the main chain skeleton and urethane. It is preferable to use a polyoxypropylene polymer having no bond. A polyoxypropylene polymer whose main chain skeleton is polyoxypropylene, has a dimethoxysilyl group as a hydrolyzable silyl group at the end of the main chain skeleton, and does not have a urethane bond is manufactured by Kaneka Corporation. Names Cyril EST280, EST250, and EST400 Exastar 3430, Exestar 6250, etc. manufactured by Asahi Glass Co., Ltd. may be mentioned.

  In the curable composition, the content of the polyoxyalkylene polymer (A) having a hydrolyzable silyl group is the total amount of the polyoxyalkylene polymer having a hydrolyzable silyl group (hydrolyzable silyl group. 50-95 mass% is preferable in the polyoxyalkylene type polymer (A) and (B) total amount) to have, 55-85 mass% is more preferable, and 60-75 mass% is especially preferable. When the content of the polyoxyalkylene polymer (A) having a hydrolyzable silyl group is 50% by mass or more, not only a normal floor finishing material but also a thin floor finishing material, After laying the finishing material, it can be firmly laid and integrated on the construction surface without generating a gap. When the content of the polyoxyalkylene polymer (A) having a hydrolyzable silyl group is 95% by mass or less, the viscosity at the time of coating of the curable composition is lowered, and excellent coating properties even in winter. Even when laying a floor finishing material having a small thickness, the floor finishing material can be beautifully laid without deformation.

  The polyoxyalkylene polymer (A) having a hydrolyzable silyl group and the polyoxyalkylene polymer (B) having a hydrolyzable silyl group are collectively referred to as “polyoxyalkylene polymer having a hydrolyzable silyl group”. Sometimes referred to as “union”.

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

  Since the crosslinkable silyl group is the same as the polyoxyalkylene polymer (A) having a hydrolyzable silyl group, description thereof is omitted.

  It is preferable that the polyoxyalkylene polymer (B) having a hydrolyzable silyl group does not contain a urethane bond. If the polyoxyalkylene polymer (B) having a hydrolyzable silyl group has a urethane bond, the viscosity of the resulting curable composition will increase at low temperatures such as in winter, resulting in coating properties and storage stability. There is a risk that the performance will be reduced.

  The polyoxyalkylene polymer (B) having a crosslinkable silyl group without a urethane bond at both terminals of the polyoxyalkylene chain is, for example, a polyoxyalkylene polymer having a functional group such as a hydroxyl group at the terminal. The compound is reacted with an organic compound having an active group and an unsaturated group that are reactive to the functional group, and then hydrosilylated by reacting the resulting reaction product with hydrosilane having a hydrolyzable group. Can be manufactured.

  The number average molecular weight of the polyoxyalkylene polymer (B) is 3000 to 6000, preferably 3500 to 5500, and more preferably 4000 to 5000. When the number average molecular weight of the polyoxyalkylene polymer (B) is 6000 or less, the viscosity at the time of coating of the curable composition is low, and the floor has excellent coating properties even in winter and is thin. Even when laying the finishing material, it can be laid beautifully without deforming the floor finishing material. Moreover, the adhesive strength of the hardened | cured material of a curable composition improves that the number average molecular weight of a polyoxyalkylene type polymer (B) is 3000 or more.

  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, and more preferably 1.3 or less. According to the polyoxyalkylene polymer (B) having a molecular weight distribution of 1.6 or less, the viscosity at the time of coating of the curable composition is low, and it has excellent coating properties even in winter and has a thickness of Even when laying a thin floor finish, the floor finish can be beautifully laid without being deformed. Furthermore, the adhesive strength of the cured product of the curable composition is improved.

  A commercially available polyoxyalkylene polymer (B) containing a hydrolyzable silyl group can be used. The polyoxyalkylene polymer (B) containing a hydrolyzable silyl group can be used without any particular limitation. Since it is a liquid substance before curing and forms good rubber elasticity after curing, the main chain skeleton is polyoxypropylene, and has a dimethoxysilyl group as a hydrolyzable silyl group at the end of the main chain skeleton and urethane. It is preferable to use a polyoxypropylene polymer having no bond. A polyoxypropylene polymer whose main chain skeleton is polyoxypropylene, has a dimethoxysilyl group as a hydrolyzable silyl group at the end of the main chain skeleton, and does not have a urethane bond is manufactured by Kaneka Corporation. The name Cyril SAX015 is mentioned.

  In the curable composition, the content of the polyoxyalkylene polymer (B) having a hydrolyzable silyl group is the total amount of the polyoxyalkylene polymer having a hydrolyzable silyl group (hydrolyzable silyl group. 5-50 mass% is preferable in the polyoxyalkylene polymer (A) and the total amount of (B) to have, 15-45 mass% is more preferable, and 25-40 mass% is especially preferable. When the content of the polyoxyalkylene polymer (B) having a hydrolyzable silyl group is 5% by mass or more, the viscosity at the time of coating of the curable composition is lowered, and excellent coating properties even in winter. Even when laying a floor finishing material having a small thickness, the floor finishing material can be beautifully laid without deformation. When the content of the polyoxyalkylene polymer (B) having a hydrolyzable silyl group is 50% by mass or less, not only a normal floor finishing material but also a thin floor finishing material, After laying the finishing material, it can be firmly laid and integrated on the construction surface without generating a gap.

[Calcium carbonate (C) and heavy calcium carbonate (D)]
The curable composition is a combination of the above-described polyoxyalkylene polymer having a hydrolyzable silyl group, surface-treated calcium carbonate (C), and heavy calcium carbonate (D) that has not been surface-treated. By using it, the hardened | cured material layer which has strong adhesive force can be formed. This cured product layer does not become too flexible, and can impart appropriate mechanical strength and appropriate rubber elasticity and extensibility. Therefore, not only ordinary floor finishing materials but also thin floor finishing materials can be firmly integrated on the construction surface without causing gaps after the floor finishing material is laid. .

  The calcium carbonate is not particularly limited, and examples thereof include heavy calcium carbonate, precipitated calcium carbonate, corolide calcium carbonate, and light calcium carbonate. As the surface-treated calcium carbonate, surface-treated heavy calcium carbonate and surface-treated precipitated calcium carbonate are preferable.

  The average particle diameter of the surface-treated calcium carbonate is preferably 0.05 to 5 μm, more preferably 0.06 to 4 μm, particularly preferably 0.065 to 3 μm, and most preferably 0.07 to 2 μm. When the average particle diameter is 0.05 μm or more, it is preferable that the floor finishing material can be laid beautifully without deformation even when the floor finishing material is thin. When the average particle size is 5 μm or less, the viscosity at the time of coating is low, and the coating property is excellent even in winter.

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

  The average particle diameter of the surface-treated heavy calcium carbonate is preferably 0.5 to 5 μm, more preferably 0.5 to 4 μm. When the average particle size is 0.5 μm or more, the viscosity at the time of coating is low and the coating property is excellent even in winter. When the average particle size is 5 μm or less, the film strength of the cured product of the curable composition is improved, and rubber elasticity is preferably improved.

  The average particle diameter of the heavy calcium carbonate that has not been surface-treated is preferably 0.5 to 5 μm, and more preferably 0.5 to 4 μm. When the average particle size is 0.5 μm or more, the viscosity at the time of coating is low and the coating property is excellent even in winter. When the average particle size is 5 μm or less, the film strength of the cured product of the curable composition is improved, and rubber elasticity is preferably improved.

In addition, the average particle diameter of calcium carbonate means the value calculated based on the following formula using the specific surface area value per 1 g of calcium carbonate. In addition, the specific surface area value per 1g of calcium carbonate can use the powder specific surface area measuring apparatus marketed with the brand name "SS-100 type" from Shimadzu Corporation.
Average particle size of calcium carbonate (μm)
= 6 × 10000 / (specific gravity × specific surface area)

  Precipitated calcium carbonate can be produced through a chemical reaction using, for example, limestone as a raw material.

  The average particle diameter of the surface-treated precipitated calcium carbonate is preferably 0.01 to 0.3 μm, more preferably 0.08 to 0.25 μm, particularly preferably 0.09 to 0.23 μm, and 0.12 to 0 .2 μm is most preferred. When the average particle diameter is 0.01 μm or more, the dispersibility of the surface-treated precipitated calcium carbonate is improved, the film strength of the cured product of the curable composition is improved, and the rubber elasticity is preferably improved. When the average particle size is 0.3 μm or less, the viscosity at the time of coating is low and the coating property is excellent even in winter.

BET specific surface area of the surface-treated precipitated calcium carbonate is preferably 8~25m ² / g, more preferably 9~18m ² / g, particularly preferably ^{10~15m 2 / g, 11~13m 2 /} g is Most preferred. When the BET specific surface area of the precipitated calcium carbonate subjected to the surface treatment is within the above range, not only a normal floor finish but also a thin floor finish can be used after the floor finish is laid. Can be firmly laid and integrated on the construction surface without causing any problems. Furthermore, the viscosity of the curable composition is low when it is applied, it has excellent coatability even in winter, and it is laid beautifully without deforming the floor finish even when laying a thin floor finish. Can do. Moreover, the storage stability of the curable composition can be improved. In addition, the BET specific surface area of the precipitated calcium carbonate subjected to the surface treatment is a value measured according to JIS Z8830. Specifically, the BET specific surface area of precipitated calcium carbonate can be measured by a one-point method using a BET specific surface area meter commercially available from Yuasa Ionics under the trade name “NOVA2000”.

  In the curable composition, the combined use of calcium carbonate that has been surface-treated and heavy calcium carbonate that has not been surface-treated as calcium carbonate results in low viscosity during coating and excellent coatability even in winter. Even when laying a floor finishing material having a small thickness, the floor finishing material can be beautifully laid without deformation. Furthermore, thixotropy can be imparted to the curable composition.

  The surface treatment of calcium carbonate is not particularly limited, but surface treatment (hydrophobic treatment) with a fatty acid, a fatty acid ester, a fatty acid metal salt, or the like is preferable. By subjecting calcium carbonate to a surface treatment with a fatty acid, a fatty acid ester, a fatty acid metal salt, or the like, aggregation of calcium carbonate can be suppressed, and as a result, the viscosity during coating of the curable composition can be reduced. Furthermore, thixotropic properties can be imparted to the curable composition.

  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, lindelic acid, tuzuic acid, fizeteric acid, molistoleic acid, palmitoleic acid, petrothelic acid, oleic acid, elaidic acid, asclebic acid, vaccenic acid, gadoleic acid, gondoic acid, Examples thereof include cetoleic acid, erucic acid, brassic acid, ceracolic acid, ximenoic acid, lumenic acid, sorbic acid and linoleic acid, and lauric acid, myristic acid, palmitic acid, stearic acid and oleic acid are preferred.

  As the fatty acid, a long chain fatty acid is preferable, a long chain fatty acid having 8 to 25 carbon atoms is more preferable, a long chain fatty acid having 10 to 20 carbon atoms is particularly preferable, and stearic acid and lauric acid are more preferable.

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

  The fatty acid ester is preferably a long-chain fatty acid ester, more preferably an ester of a long-chain fatty acid having 8 to 25 carbon atoms, particularly preferably an ester of a long-chain fatty acid having 10 to 20 carbon atoms, stearic acid ester and Lauric acid esters are most preferred.

  Examples of the fatty acid metal salt include sodium salts and potassium salts of the above fatty acids, potassium lauric acid, potassium myristate, potassium palmitate, potassium stearate and potassium oleate, Sodium salt of lauric acid, sodium salt of myristic acid, sodium salt of palmitic acid, sodium salt of stearic acid and sodium salt of oleic acid are preferred, sodium salt of lauric acid, sodium salt of myristic acid, sodium salt of palmitic acid, More preferred are the sodium salt of stearic acid and the sodium salt of oleic acid.

  A curable composition containing precipitated calcium carbonate treated with a fatty acid metal salt is excellent in rubber elasticity of a cured product obtained by curing the curable composition. Examples of the method for treating precipitated calcium carbonate with a fatty acid metal salt include a method of immersing precipitated calcium carbonate in an aqueous alkali metal solution such as an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution.

  In the curable composition, the content of the surface-treated calcium carbonate is the total amount of the polyoxyalkylene polymer containing hydrolyzable silyl groups [polyoxyalkylene polymer (A) and polyoxyalkylene polymer weight]. The total amount of the combined (B)] is preferably 0.5 to 500 parts by mass, preferably 0.5 to 350 parts by mass, preferably 0.5 to 140 parts by mass, and 0.5 to 40 parts by mass with respect to 100 parts by mass. Is preferable, 5-40 mass parts is more preferable, 15-40 mass parts is especially preferable, and 18-35 mass parts is especially preferable. When the content of the surface-treated calcium carbonate is 0.5 parts by mass or more, not only a normal floor finish but also a thin floor finish can be used after the floor finish is laid. Can be firmly laid and integrated on the construction surface without causing any problems. When the surface-treated calcium carbonate content is 500 parts by mass or less, the viscosity of the curable composition at the time of coating is low, and it has excellent coating properties even in winter and has a thin floor finish. Even in laying, it can be laid beautifully without deforming the floor finish. Furthermore, the storage stability of the curable composition is excellent.

  In the curable composition, the content of the surface-treated heavy calcium carbonate is the total amount of the polyoxyalkylene polymer containing hydrolyzable silyl groups [polyoxyalkylene polymer (A) and polyoxyalkylene. Total amount of system polymer (B)] is preferably 30 to 500 parts by mass, more preferably 50 to 350 parts by mass, and particularly preferably 50 to 140 parts by mass with respect to 100 parts by mass. When the content of the surface-treated heavy calcium carbonate is 30 parts by mass or more, not only a normal floor finish but also a thin floor finish can be used after the floor finish is laid. Can be firmly laid and integrated on the construction surface without causing any problems. When the content of the surface-treated heavy calcium carbonate is 500 parts by mass or less, the viscosity of the curable composition at the time of coating is low, and it has excellent coatability even in winter and has a thin floor finish. Even in laying the material, it can be laid beautifully without deforming the floor finish.

  In the curable composition, the content of the surface-treated precipitated calcium carbonate is the total amount of polyoxyalkylene polymers containing hydrolyzable silyl groups [polyoxyalkylene polymer (A) and polyoxyalkylene. The total amount of the system polymer (B)] is preferably 0.5 to 60 parts by mass, more preferably 5 to 40 parts by mass, particularly preferably 15 to 40 parts by mass, and particularly preferably 18 to 35 parts by mass with respect to 100 parts by mass. When the content of the surface-treated precipitated calcium carbonate is 0.5 parts by mass or more, not only ordinary floor finishing materials but also thin floor finishing materials after laying the floor finishing material It can be firmly laid and integrated on the construction surface without causing gaps. When the content of the surface-treated precipitated calcium carbonate is 60 parts by mass or less, the viscosity of the curable composition at the time of coating is low, and it has excellent coatability even in winter and has a thin floor finish. Even in laying the material, it can be laid beautifully without deforming the floor finish. Furthermore, the storage stability of the curable composition can be improved.

  In the curable composition, the content of heavy calcium carbonate that has not been surface-treated is preferably 10 to 300 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer containing a hydrolyzable silyl group. -250 mass parts are preferable, 50-230 mass parts are preferable, 70-220 mass parts is preferable, 90-210 mass parts is especially preferable, 160-205 mass parts is the most preferable. It is preferable that the content of heavy calcium carbonate that has not been surface-treated is 10 parts by mass or more because the film strength of the cured product of the curable composition is improved and the rubber elasticity is improved. If the content of heavy calcium carbonate that has not been surface-treated is 300 parts by mass or less, not only ordinary floor finish materials, but also thin floor finish materials, It can be firmly laid and integrated on the construction surface without creating a gap. Furthermore, the viscosity of the curable composition is low when it is applied, it has excellent coatability even in winter, and it is laid beautifully without deforming the floor finish even when laying a thin floor finish. Can do.

  When the surface-treated heavy calcium carbonate and the surface-treated heavy calcium carbonate are contained in the curable composition, the surface-treated heavy calcium carbonate is not included in the curable composition. The content of is preferably 10 to 300 parts by mass, more preferably 10 to 150 parts by mass, and preferably 90 to 130 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer containing a hydrolyzable silyl group. The thixotropy excellent in the curable composition can be provided as content of the heavy calcium carbonate which is not surface-treated is 10 mass parts or more. If the content of heavy calcium carbonate that has not been surface-treated is 300 parts by mass or less, not only ordinary floor finish materials, but also thin floor finish materials, It can be firmly laid and integrated on the construction surface without creating a gap. Furthermore, the viscosity of the curable composition is low when it is applied, it has excellent coatability even in winter, and it is laid beautifully without deforming the floor finish even when laying a thin floor finish. Can do.

  When the curable composition contains precipitated calcium carbonate that has been surface-treated and heavy calcium carbonate that has not been surface-treated, heavy calcium carbonate that has not been surface-treated in the curable composition The content of is preferably 10 to 300 parts by weight, preferably 10 to 250 parts by weight, preferably 50 to 230 parts by weight, based on 100 parts by weight of the polyoxyalkylene polymer containing a hydrolyzable silyl group. -220 mass parts is more preferable, 90-210 mass parts is especially preferable, and 160-205 mass parts is the most preferable. The thixotropy excellent in the curable composition can be provided as content of the heavy calcium carbonate which is not surface-treated is 10 mass parts or more. If the content of heavy calcium carbonate that has not been surface-treated is 300 parts by mass or less, not only ordinary floor finish materials, but also thin floor finish materials, It can be firmly laid and integrated on the construction surface without creating a gap. Furthermore, the viscosity of the curable composition is low when it is applied, it has excellent coatability even in winter, and it is laid beautifully without deforming the floor finish even when laying a thin floor finish. Can do.

  In the curable composition, the ratio of the content of surface-treated calcium carbonate to the content of heavy calcium carbonate that has not been surface-treated (content of surface-treated calcium carbonate / weight that has not been surface-treated) 0.03 to 2 is preferable, 0.07 to 1.3 is preferable, 0.08 to 1.2 is preferable, 0.09 to 0.7 is more preferable, and 0.09 to 0.7 is more preferable. 095 to 0.5 is particularly preferable, and 0.096 to 0.3 is most preferable. When the ratio of the content of surface-treated calcium carbonate and the content of heavy calcium carbonate that has not been surface-treated is within the above range, not only ordinary floor finishing materials but also thin floor finishing materials Even so, after the floor finishing material is laid, it can be firmly laid and integrated on the construction surface without generating a gap. Furthermore, the viscosity of the curable composition is low when it is applied, it has excellent coatability even in winter, and it is laid beautifully without deforming the floor finish even when laying a thin floor finish. Can do.

  In the case where the curable composition contains surface-treated heavy calcium carbonate and non-surface-treated heavy calcium carbonate, the surface-treated heavy calcium carbonate in the curable composition The ratio of the content and the content of heavy calcium carbonate not surface-treated (the content of heavy calcium carbonate surface-treated / the content of heavy calcium carbonate not surface-treated) is 0.7. ˜2 is preferable, 0.8 to 1.3 is more preferable, and 0.9 to 1.2 is particularly preferable. If the ratio of the content of the surface-treated heavy calcium carbonate and the content of the non-surface-treated heavy calcium carbonate is within the above range, the floor is thin as well as the normal floor finish. Even if it is a finishing material, it can be firmly laid and integrated on the construction surface without creating a gap after laying the floor finishing material. Furthermore, the viscosity of the curable composition is low when it is applied, it has excellent coatability even in winter, and it is laid beautifully without deforming the floor finish even when laying a thin floor finish. Can do.

  In the case where the curable composition contains surface-treated precipitated calcium carbonate and non-surface-treated heavy calcium carbonate, the surface-treated precipitated calcium carbonate in the curable composition The ratio of the content and the content of heavy calcium carbonate not surface-treated (the content of precipitated calcium carbonate surface-treated / the content of heavy calcium carbonate not surface-treated) is 0.03. -2, 0.07-1.3 is preferred, 0.08-1.2 is preferred, 0.09-0.7 is more preferred, 0.095-0.5 is particularly preferred, 0.096 -0.3 is most preferred. If the ratio of the content of precipitated calcium carbonate that has been surface-treated and the content of heavy calcium carbonate that has not been surface-treated is within the above range, not only ordinary floor finish materials but also thin floors Even if it is a finishing material, it can be firmly laid and integrated on the construction surface without creating a gap after laying the floor finishing material. Furthermore, the viscosity of the curable composition is low when it is applied, it has excellent coatability even in winter, and it is laid beautifully without deforming the floor finish even when laying a thin floor finish. Can do.

[Hindered amine]
The hindered amine is usually used as a light stabilizer, but in the curable composition of the present invention, it is used to impart heat resistance to the cured product of the curable composition.

  The curable composition is used to lay and integrate a floor finishing material on a floor base material or an existing floor finishing material (sometimes collectively referred to as “construction surface”), and after laying the floor finishing material The cured product of the curable composition is not irradiated with light.

  As a result of intensive studies by the inventor, it has been found that hindered amine has an effect of imparting heat resistance to the curable composition in addition to the effect as a light stabilizer. That is, by including a hindered amine in the curable composition, the curing can be performed without improving the viscosity at the time of coating the curable composition and without inhibiting the excellent adhesiveness of the cured product of the curable composition. It has been found that heat resistance is imparted to the composition.

  Examples of the hindered amine include a mixture of bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and methyl 1,2,2,6,6-pentamethyl-4-piperidyl sebacate, bis (2 , 2,6,6-tetramethyl-4-piperidyl) sebacate, dibutylamine, 1,3,5-triazine, N, N′-bis (2,2,6,6-tetramethyl-4-piperidyl-1 , 6-Hexamethylenediamine and N- (2,2,6,6-tetramethyl-4-piperidyl) butylamine polycondensate, poly [{6- (1,1,3,3-tetramethylbutyl) Amino-1,3,5-triazine-2,4-diyl} {(2,2,6,6-tetramethyl-4-piperidyl) imino} hexamethylene {(2,2,6,6-tetramethyl- 4-pipe Zyl) imino}], polycondensate of dimethyl succinate and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol, dimethyl succinate and 4-hydroxy-2,2,6,6 A polymer of tetramethyl-1-piperidineethanol and N, N ′, N ″, N ′ ″-tetrakis- (4,6-bis- (butyl- (N-methyl-2,2,6, 6-tetramethylpiperidin-4-yl) amino) -triazin-2-yl) -4,7-diazadecane-1,10-diamine and the like, and the like, and dimethyl succinate and 4 -Polymers with -hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol and N, N ', N ", N' ''-tetrakis- (4,6-bis- (butyl- ( N-methyl-2,2,6,6-tetra 1-to-1 reaction product with tilpiperidin-4-yl) amino) -triazin-2-yl) -4,7-diazadecane-1,10-diamine, dibutylamine 1,3,5-triazine N , N′-bis (2,2,6,6-tetramethyl-4-piperidyl-1,6-hexamethylenediamine and N- (2,2,6,6-tetramethyl-4-piperidyl) butylamine Polycondensate, poly [{6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl} {(2,2,6,6-tetramethyl -4-Piperidyl) imino} hexamethylene {(2,2,6,6-tetramethyl-4-piperidyl) imino}] is preferred.

  The content of hindered amine in the curable composition is preferably 0.01 to 20 parts by mass, more preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer having a hydrolyzable silyl group. preferable. When the hindered amine content is 0.01 parts by mass or more, excellent heat resistance can be imparted to the curable composition. The adhesive strength of a curable composition improves that content of hindered amine is 20 mass parts or less.

[Silanol condensation catalyst (E)]
The curable composition preferably contains a silanol condensation catalyst (E). A silanol condensation catalyst is a catalyst for promoting a dehydration condensation reaction between silanol groups formed by hydrolyzing a hydrolyzable silyl group contained in a polyoxyalkylene polymer having a hydrolyzable silyl group. It is. The silanol group means a hydroxy group (≡Si—OH) bonded directly to a silicon atom.

  Silanol condensation catalysts (E) include dibutyltin dilaurate, dibutyltin oxide, dibutyltin diacetate, dibutyltin phthalate, bis (dibutyltin lauric acid) oxide, dibutyltin bis (acetylacetonate), dibutyltin bis (monoester) Malate), tin octylate, dibutyltin octoate, dioctyltin oxide, dibutyltin bis (triethoxysilicate), dioctyltin bis (triethoxysilicate), dioctyltin dilaurate, bis (dibutyltin bistriethoxysilicate) oxide, and dibutyl Organotin compounds such as tin oxybisethoxysilicate; Organotitanium compounds such as tetra-n-butoxy titanate and tetraisopropoxy titanate; 1,5,7-triazabicyclo [4. .0] deca5-ene, 7-methyl-1,5,7-triazabicyclo [4.4.0] deca5-ene, 1,8-diazabicyclo [5.4.0] undec-7-ene. Cycloamidine compounds such as 6-dibutylamino-1,8-diazabicyclo [5.4.0] undec-7-ene, 1,5-diazabicyclo [4.3.0] noner-5-ene; Examples include 2-ethylhexoate. 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.

  Above all, as silanol condensation catalyst, not only floor finish with normal thickness but also floor finish with thin thickness can be firmly laid on the construction surface without creating gaps after laying. Therefore, organotin compounds are preferred, octyltin compounds are more preferred, and dioctyltin bis (triethoxysilicate) is particularly preferred.

  The content of the silanol condensation catalyst in the curable composition is preferably 0.1 to 5 parts by mass, and 0.5 to 3 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer having a hydrolyzable silyl group. Is more preferable. Curability of a curable composition improves that content of the silanol condensation catalyst in a curable composition is 0.1 mass part or more. When the content of the silanol condensation catalyst in the curable composition is 5 parts by mass or less, the storage stability and handleability of the curable composition are improved.

[Hollow filler]
The curable composition includes a hollow filler. According to the hollow filler, it is possible to impart an appropriate mechanical strength and an appropriate rubber elasticity to the cured product layer obtained by curing the curable composition containing the filler, and the cured product layer is used. Generation of gaps in the floor structure can be reduced.

  The hollow filler is a hollow made of a hollow inorganic filler such as glass balloon, silica balloon, ceramic balloon, shirasu balloon, and fly ash balloon, or a synthetic resin such as polyvinylidene fluoride or polyvinylidene fluoride copolymer. And organic organic fillers. These hollow fillers may be used alone or in combination of two or more.

  As the hollow filler, hollow inorganic fillers are preferable, glass balloons, shirasu balloons, and fly ash balloons are more preferable, and shirasu balloons and fly ash balloons are particularly preferable.

  The glass balloon is a filler having a hollow spherical shape made of glass, and is also referred to as “glass hollow filler”. Such glass balloons are commercially available from, for example, Glass Bubbles S series and K series manufactured by Sumitomo 3M.

  The Shirasu balloon is a foam made by instantaneously heating volcanic ash (Shirasu) at about 1000 ° C., and is commercially available, for example, as a VS light series from Daiken Kogyo Co., Ltd.

  The fly ash balloon is a filler having a hollow sphere made of ash contained in flue gas in a coal-fired power plant or the like, and contains silica and alumina as main components. Such a fly ash balloon is commercially available, for example, as the Fillite series from Nippon Philite Co., Ltd.

  The average particle size of the hollow filler is a value measured using a laser diffraction / scattering particle size analyzer. For example, after putting a hollow filler into methanol so that the concentration becomes 10% by mass, an ultrasonic homogenizer is used to irradiate ultrasonic waves at an output of 1 kW for 10 minutes to obtain a suspension. For the liquid, the volume particle size distribution of the hollow filler is measured by a laser diffraction / scattering particle size analyzer (for example, SACD-2100 manufactured by Shimadzu Corporation), and the value of 50% of the cumulative volume particle size distribution is measured as the hollow filler. The average particle diameter can be calculated.

True density of the hollow filler is preferably from 0.1 to 1.0 g / cm ^3, more preferably 0.15~0.8g / cm ^3. According to the hollow filler having a density within the above range, the cured product layer obtained by curing the curable composition containing the filler gives an appropriate mechanical strength and an appropriate rubber elasticity, and the cured product layer Generation of gaps in the floor structure used can be reduced.

  The true density of the hollow filler can be measured, for example, by a gas displacement method using a density measuring device (for example, Akipic II 1340 manufactured by Shimadzu Corporation).

  The content of the hollow filler in the curable composition is preferably 1 to 30 parts by mass and more preferably 1 to 20 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer having a hydrolyzable silyl group. 5 to 20 parts by mass is preferable. When the content of the hollow filler in the curable composition is 1 part by mass or more, an appropriate mechanical strength and rubber elasticity are imparted to the cured product of the curable composition, and the cured product layer is used. Generation of gaps in the floor structure can be reduced. When the content of the hollow filler in the curable composition is 30 parts by mass or less, the viscosity at the time of application of the curable composition is low, and it has excellent coatability even in winter and is thin. Even when laying the floor finishing material, it can be laid beautifully without deforming the floor finishing material.

[Aminosilane coupling agent]
The curable composition preferably contains an aminosilane coupling agent. When the curable composition contains an aminosilane coupling agent, not only a normal floor finish but also a thin floor finish can be made without any gaps after the floor finish is laid. It can be firmly laid and integrated on the construction surface.

  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 Etc., and the like.

  The content of the aminosilane coupling agent in the curable composition is preferably 0.1 to 20 parts by mass, and 1 to 10 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer having a hydrolyzable silyl group. More preferred is 2 to 6 parts by mass. When the content of the aminosilane coupling agent is 0.1 parts by mass or more, not only ordinary floor finish materials but also thin floor finish materials may cause gaps after the floor finish material is laid. It can be firmly laid and integrated on the construction surface without causing it. The adhesive strength of a curable composition improves that content of an aminosilane coupling agent is 20 mass parts or less.

[Epoxysilane coupling agent]
It is preferable that the curable composition further contains an epoxy silane coupling agent. According to the hardened | cured material layer formed by hardening | curing the curable composition containing an epoxy silane coupling agent, it can reduce that a space | gap generate | occur | produces in the floor structure using the said hardened | cured material layer.

  The epoxy silane coupling agent means a compound containing a silicon atom having an alkoxy group bonded in one molecule and a functional group containing an epoxy group. Specific examples of the epoxy silane coupling agent include 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, and 3-glycidoxypropylethyldisilane. Examples thereof include ethoxysilane, and 2- (3,4 epoxycyclohexyl) ethyltrimethoxysilane. These epoxy silane coupling agents may be used alone or in combination of two or more. Of these, 3-glycidoxypropyltrimethoxysilane is preferable.

[Dehydrating agent]
The curable composition preferably further contains a dehydrating agent. According to the dehydrating agent, when the curable composition is stored, the curable composition can be prevented 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 curable composition is preferably 0.5 to 20 parts by mass, more preferably 1 to 15 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer having a hydrolyzable silyl group. 1 to 5 parts by mass is particularly preferable. When the content of the dehydrating agent in the curable composition is 0.5 parts by mass or more, the storage stability of the curable composition is improved. When the content of the dehydrating agent in the curable composition is 20 parts by mass or less, the storage stability and handleability of the curable composition are improved.

[Other additives]
The curable composition may contain other additives such as an antioxidant, an ultraviolet absorber, a light-resistant stabilizer, a pigment, a dye, an anti-settling agent, and a solvent. Of these, antioxidants are preferred.

  Examples of the antioxidant include hindered phenol antioxidants, monophenol antioxidants, bisphenol antioxidants, polyphenol antioxidants, and the like, and hindered phenol antioxidants are preferable. The content of the antioxidant in the curable composition is preferably 0.1 to 20 parts by mass, and 0.3 to 10 parts by mass with respect to 100 parts by mass of the polyoxyalkylene polymer having a hydrolyzable silyl group. Is more preferable.

[Production of curable composition]
Production of the curable composition includes polyoxyalkylene polymers (A) and (B) containing hydrolyzable silyl groups, surface-treated calcium carbonate (C) and surface-treated calcium carbonate (D). The silanol condensation catalyst (E) and other additives may be mixed as required. Mixing is preferably performed under reduced pressure.

[Floor structure]
An example of a schematic cross-sectional view of a floor structure using a curable composition 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 a cured product layer 10 formed by curing a curable composition on the floor base material 30. The floor finish 20 is bonded and integrated.

  In such a floor structure, for example, a floor base material 30 is laid on a floor base 1 such as dirt concrete or a concrete floor slab via a spacer 2, and a curable composition is placed on the floor base material 30. After coating, floor finishing materials 20 are laid, and these are allowed to stand for a predetermined time and cured by curing the curable composition with moisture in the air and moisture contained in the floor finishing material and floor base material. The physical layer 10 is obtained, and the floor base material 30 and the floor finishing material 20 are bonded and integrated by the cured product layer 10.

  In addition, in the above, in order to keep the floor base 1 and the floor base material 30 in a non-contact state, the floor base material 30 is laid on the floor base 1 via the spacer 2, but the spacer on the floor base 1 The floor base material 30 may be laid directly without using 2.

  Examples of the members constituting the floor finishing material include wood-based materials such as plywood and medium density fiberboard (MDF), tiles, vinyl chloride sheets, and stone materials. preferable.

  Examples of the members constituting the floor base material include plywood, particle board, tree joist, gypsum board, slate board, and concrete board.

  The said curable composition has the low viscosity at the time of coating of a curable composition, and has the coating property outstanding also in winter. Therefore, in applying the curable composition, the curable composition can be easily and uniformly applied on the floor base material without being an expert. The curable composition flows smoothly and uniformly spreads between the floor finish and the floor base material, and the curable composition is uniformly interposed between the floor base material and the floor finish. Become. Therefore, the floor finishing material can be laid and integrated in a beautiful state and firmly on the floor base material.

  And since the floor finishing material is firmly bonded and integrated on the floor base material by the cured product of the curable composition, the occurrence of gaps in the floor finishing material after construction is suppressed.

  Moreover, in renovation etc., as shown in FIG. 2, a floor structure may be constructed by laying and integrating a new floor finishing material on a floor finishing material of an existing floor structure using a curable composition.

  The case where the floor structure shown in FIG. 1 is an existing floor structure will be described as an example. After coating the curable composition on the existing floor finish 20, a new floor finish 40 is laid.

  After that, the cured product layer 50 is obtained by leaving it to stand for a predetermined time to cure the curable composition with moisture in the air or moisture contained in the floor finish and the floor base material. As a result, the existing floor finish 20 and the new floor finish 40 are bonded and integrated to construct a new floor structure.

  The cured product layer 10 ′ of the curable composition used in the existing floor structure is not limited to the cured product layer of the curable composition of the present invention, but is a cured product layer of a known curable composition. It's okay.

  In the case of the construction of the floor structure shown in FIG. 2, the floor material of the new floor construction is a floor where the thickness is normally used so that the floor surface of the newly constructed floor structure is not as high as possible compared to the floor surface of the existing floor structure. It is thinner than the finish. Such a floor finish is easily deformed and has a larger dimensional change rate with a temperature change than a floor finish having a normal thickness.

  As described above, the curable composition has a low viscosity at the time of coating even in a low temperature atmosphere such as in winter. After coating on an existing floor finish, a new floor finish is applied. When laid, it smoothly flows and spreads uniformly between the existing floor finish and the new floor finish.

  Therefore, the new floor finish is deformed by the presence of the partially thickened curable composition, and there is no unexpected situation where the surface is uneven. Will be laid.

  Furthermore, since the new floor finish is firmly bonded and integrated on the existing floor finish by the cured product of the curable composition, the floor finish is thin and has low dimensional stability. However, it is suppressed that a gap is generated in the floor finishing material after the construction.

  In the floor structure of FIG. 1, the case where the floor base material is laid and integrated on the floor base material via the cured product layer of the curable composition has been described, but a known floor heating panel is provided on the floor base material. The floor finishing material may be laid and integrated on the floor heating panel via a cured product layer of the curable composition.

  In the floor structure of FIG. 2 as well, in the existing floor structure, a known floor heating panel is disposed on the floor base material, and the floor finish is provided on the floor heating panel via a cured product layer of a known curable composition. The material may be laid and integrated.

  When the floor heating panel is provided, the floor finish is also heated by the floor heating panel, but when the curable composition contains a hindered amine, the curable composition exhibits excellent heat resistance.

  Therefore, in spite of the heating by the floor heating panel, the cured product layer of the curable composition is constructed by firmly laying and integrating the floor finish (new floor finish in the floor structure in FIG. 2) on the construction surface. The floor surface can be maintained in a beautiful state for a long period of time without causing a gap or the like in the floor finishing material constituting the floor surface of the structure.

  The Shore A hardness of the cured product layer obtained by curing the curable composition is preferably 55 to 85, and more preferably 60 to 75. When the Shore A hardness of the cured product layer is 55 or more, the cured product layer can firmly bond and integrate the floor finishing material on the construction surface, and the generation of gaps in the floor finishing material can be suppressed. A Shore A hardness of the cured product layer of 85 or less is preferable because the cured product layer has rubber elasticity and can further reduce floor noise.

  In the present invention, the Shore A hardness of the cured product layer obtained by curing the curable composition is measured by applying a curable composition as a base material on a softwood plywood with a width of 10 mm and a thickness of 10 mm, and then a temperature of 23 A cured product layer is formed by leaving it for 14 days in an atmosphere of 50 ° C. and a relative humidity of 50%, and the Shore A hardness of the cured product layer is measured using an A-type hardness meter in accordance with JIS K6253. Can be done.

  The curable composition of the present invention is cured by moisture in the air or moisture contained in the floor finish and the floor base material, and the floor finish is on the construction surface (floor base material or existing floor finish material). Can be firmly bonded and integrated.

  Therefore, not only when the floor finish has a normal thickness, but even when the floor finish is thin, the floor finish is tightly bonded and integrated on the construction surface, resulting in gaps in the floor finish. Can be effectively suppressed.

  Furthermore, the curable composition of the present invention has a low viscosity at the time of coating of the curable composition, and has excellent coating properties even in winter. The curable composition can be disposed with a uniform thickness between the floor finish and the construction surface.

  Therefore, not only when the floor finish has a normal thickness but also when the thickness is thin, the floor finish is beautifully integrated on the construction surface without causing irregularities in the floor finish. can do.

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

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. It is the perspective view which showed one of the procedures of the gap test. It is the perspective view which showed joined body (I) produced by the gap test. It is the perspective view which showed joined_body | zygote (II) produced by the gap test.

  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.

The compounds used in Examples and Comparative Examples are shown below.
[Polyoxyalkylene resin having hydrolyzable silyl group]
・ Polyoxyalkylene polymer having hydrolyzable silyl group (A) (polyoxypropylene polymer having dimethoxysilyl group as hydrolyzable silyl group and main chain skeleton being polyoxypropylene, urethane bond No, number average molecular weight: 10000, molecular weight distribution: 1.49, viscosity at 25 ° C .: 7000 mPa · s, product name “Syryl EST280” manufactured by Kaneka)
・ Polyoxyalkylene polymer having hydrolyzable silyl group (B) (polyoxypropylene polymer having dimethoxysilyl group as hydrolyzable silyl group and main chain structure being polyoxypropylene, urethane bond No, number average molecular weight: 4500, viscosity at 25 ° C. 400 mPa · s, product name “SAX015” manufactured by Kaneka Corporation

[Surface-treated calcium carbonate (C) and non-surface-treated heavy calcium carbonate (D)]
-Surface-treated heavy calcium carbonate (C1) (product name “NCC2310” manufactured by Nitto Flour Chemical Co., Ltd., surface treatment with stearic acid, average particle size: 1.0 μm)
Surface-treated precipitated calcium carbonate (C2) (product name “CALCIES PLS505” manufactured by Kamishima Chemical Co., Ltd., surface treatment with fatty acid, BET specific surface area: 12 m ² / g, average particle size: 0.19 μm)
Surface treated precipitated calcium carbonate (C3) (product name “CCR” manufactured by Shiroishi Kogyo Co., Ltd., surface treatment with fatty acid, BET specific surface area: 20 m ² / g, average particle size: 0.12 μm)
Surface treated precipitated calcium carbonate (C4) (product name “Calfine N-350” manufactured by Maruo Calcium, surface treatment with fatty acid, BET specific surface area: 24 m ² / g, average particle size: 0.097 μm)
Surface treated precipitated calcium carbonate (C5) (product name “CC” manufactured by Shiraishi Kogyo Co., Ltd., surface treatment with fatty acid, BET specific surface area: 26 m ² / g, average particle size: 0.089 μm)
-Untreated surface heavy calcium carbonate (D1) (product name “Whiteon SB” manufactured by Shiraishi Calcium Co., Ltd., average particle size: 2.0 μm)
-Untreated surface heavy calcium carbonate (D2) (product name “Whiteon P-30” manufactured by Shiraishi Calcium Co., Ltd., average particle size: 2.0 μm)

[Silanol condensation catalyst (E)]
Silanol condensation catalyst (E) (dioctyltin bis (triethoxysilicate), product name “Neostan S-1” manufactured by Nitto Kasei Co., Ltd.)

[Aminosilane coupling agent]
Aminosilane coupling agent (N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, trade name “KBM-603” manufactured by Shin-Etsu Chemical Co., Ltd.)

[Dehydrating agent]
・ Dehydrating agent (vinyltrimethoxysilane)

[Hindered amine]
Hindered amine (dibutylamine, 1,3,5-triazine, N, N′-bis (2,2,6,6-tetramethyl-4-piperidyl-1,6-hexamethylenediamine and N- (2,2 , 6,6-tetramethyl-4-piperidyl) butylamine, polycondensate, product name “Chimassorb2020FDL” manufactured by BASF, molecular weight: 3000)

[Antioxidant]
-Hindered phenolic antioxidant (IRGANOX (registered trademark) 1010 manufactured by BASF)
(Example 1-7, Comparative Example 1-6)
Polyoxyalkylene polymer (A) having a hydrolyzable silyl group, polyoxyalkylene polymer (B) having a hydrolyzable silyl group, surface-treated calcium carbonate (C), unsurface-treated heavy Each of calcium carbonate (D), silanol condensation catalyst (E), hindered amine, aminosilane coupling agent, dehydrating agent and hindered phenolic antioxidant is blended as shown in Table 1 or Table 2 and sealed. A curable composition was produced by mixing until uniform in a stirrer with reduced pressure.

  About the obtained curable composition, normal-state adhesive strength, a viscosity, the space | gap test 1, and the space | gap test 2 were measured in the following way, and the result was shown in Table 1 and Table 2.

  The Shore A hardness of the cured product of the obtained curable composition was measured, and the results are shown in Tables 1 and 2.

(Normal bond strength)
The normal adhesive strength (90 degree peel test) of the curable composition was measured in accordance with JIS A5536 5.3.3 e) 1). The floor finishing material marketed by Asahi Woodtech Co., Ltd. under the trade name “Live Natural (thickness: 12 mm) was used as the floor finishing material for testing. Softwood plywood was used as the floor base material for testing.

(viscosity)
The viscosity of the curable composition immediately after production was measured under the conditions of 23 ° C. and 10 revolutions / minute using a B-type viscometer in accordance with JIS K6833 to obtain an initial viscosity. The viscosity of the curable composition after leaving the curable composition for 6 months at 23 ° C. is measured and stored under conditions of 23 ° C. and 10 revolutions / minute using a B-type viscometer according to JIS K6833. It was set as the post viscosity.

The storage stability was calculated based on the following formula from the measured initial viscosity and the viscosity after storage.
Storage stability (%) = 100 × (viscosity after storage−initial viscosity) / initial viscosity

(Clearance test 1)
After drying the floor base material 70 (conifer plywood: length 300 mm × width 1800 mm × thickness 20 mm) by heating at 80 ° C. for 1 week, as shown in FIG. 3, the floor base material 70 is curable in the short direction. Six compositions 60 ′ were coated in a bead shape (width 6 mm, thickness 5 mm) so that the mutual distance was 6 mm.

  Thereafter, as shown in FIG. 4, two floor finish materials 80 (conifer plywood: length 300 mm × width 900 mm × thickness 12 mm) are provided on the surface of the floor base material 70 on which the curable composition 60 ′ is applied. The laminate was obtained by laminating such that one end surface in the short direction of one floor finish 80 and the other end surface in the short direction of the other floor finish 80 were in contact with each other.

  Next, nails 81 are struck in the four corners of the floor finish 80 of the laminate, and the floor finish 80 is fixed to the floor base material 70, and then the laminate is placed in an atmosphere of 23 ° C. and 55% relative humidity for 2 weeks. By curing, the curable composition 60 ′ is cured to form a cured product layer 60, and a joined body (I) in which the floor base material 70 and the floor finish material 80 are bonded and integrated by the cured product layer 60 is obtained. It was.

  The joined body (I) was dried for 1 week in an atmosphere of a temperature of 80 ° C. and a relative humidity of 2%. The dimension (mm) of the gap generated between the two floor finishing materials 80, 80 in the joined body (I) after drying was measured.

(Clearance test 2)
After completion of the gap test 1, six curable compositions are applied in the form of a bead (width 6 mm, thickness 5 mm) on two floor finishes 80 in a longitudinal direction so that the distance between them is 6 mm. did.

  Two new floor finishing materials 90 (conifer plywood: length 300 mm × width 900 mm × thickness 6.3 mm) were prepared. Two new floor finishes 90 on one side of the floor finish 90 and the other floor finish 90 short on the surface of the floor finish 80 coated with the curable composition. A laminate was obtained by laminating so that the other end surface in the hand direction was in contact.

  Next, nails 91 are struck at the four corners of the floor finish 90 of the laminate, and the floor finish 90 is fixed to the floor base material 70. Then, the laminate is placed in an atmosphere of 23 ° C. and 55% relative humidity for 2 weeks. By curing, the curable composition is cured to form a cured product layer 61, and the existing floor finish 80 and a new floor finish 90 are bonded and integrated by the cured product 61 (II) Was obtained (see FIG. 5).

  Then, the joined body (II) was dried in an atmosphere of a temperature of 80 ° C. and a relative humidity of 2% for one week. The dimension (mm) of the gap generated between two new floor finishing materials 90, 90 in the bonded body (II) after drying was measured.

1 Floor base
10 Hardened material layer
20 Floor finish
30 Floor material
50 Cured layer
60 'curable composition
60 Cured layer
61 Hardened material layer
70 Flooring material
80 Flooring material
90 Floor finish

Claims (3)

A polyoxyalkylene polymer (A) having a hydrolyzable silyl group having a number average molecular weight of 8000 to 30,000,
A polyoxyalkylene polymer (B) having a hydrolyzable silyl group having a number average molecular weight of 3000 to 6000,
Surface treated calcium carbonate (C);
Heavy calcium carbonate (D) which is not surface-treated;
Containing a silanol condensation catalyst (E) ,
The surface-treated calcium carbonate (C) contains a surface-treated heavy calcium carbonate . The curable composition according to claim 1 , further comprising a hindered amine. The curable composition according to claim 1 or 2 , wherein the silanol condensation catalyst (E) contains an octyltin compound.

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