JP3073846B2 - Polyurethane leveling material and leveling method using it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyurethane leveling material and a leveling method using the same, and particularly to the construction of concrete structures such as condominiums. The present invention relates to a polyurethane leveling material for attaching and fixing interior members such as a heat insulating material, a wooden board, a decorative board, a plywood, and a tile, and a leveling method using the same.

[0002]

2. Description of the Related Art Conventionally, in the construction of concrete structures such as condominiums, after a structure is made of concrete, a heat insulating material, a heat insulating material, a wooden board, a decorative board, a plywood, a tile are provided on the surface of the wall, floor, ceiling and the like. Attach and fix interior members such as. However, since the surface of the concrete structure has considerable irregularities, the distance from the interior member is usually not constant, and the gap may be as large as several centimeters. As a method of accurately fixing the interior member to the uneven surface of such a concrete structure, conventionally, a gypsum plaster is kneaded with water or a synthetic resin emulsion, divided into a large number of small blocks (commonly known as GL bonds), and these are crushed into a concrete surface. A method generally called a GL bonding method is known in which after being dispersed and arranged in a thickly raised state, an interior member is pressed and fixed from above. This GL bond method is GL
It is characterized in that the bond is deformed between the concrete structure surface and the interior member in accordance with the distance between the concrete structure surface and the interior member, so that the surface of the interior member can be adjusted (leveled) to a uniform plane and fixed.

[0003]

However, in the GL bonding method, a large amount of water or a synthetic resin emulsion is used to knead the GL plaster. For this reason, it takes about one week to cure and dry the GL plaster, and if the interior material is stretched while drying is insufficient, the moisture will come out and cause stains or mold on the interior material. The GL plaster is heavy and burdens the operator. Therefore, an object of the present invention is to enable accurate leveling and fixation of an interior member easily without adjusting the groundwork, even when the surface of the concrete structure has some irregularities. For example, in addition to contributing to shortening the construction period by speeding up wallpapering, there is no occurrence of stains, molds, etc. due to moisture, and it is lightweight and has a low burden on workers. It is intended to provide.

[0004]

According to the present invention, a polyurethane leveling material according to the present invention has a foaming amount of 2 to 30 parts per 100 parts by volume.
A volume part of a urethane prepolymer and a catalytic amount of an ethyl ether-based catalyst are added, mixed, and preferably filled in a net-like container. And a mixture of 2 to 30 parts by volume of a urethane prepolymer and a catalytic amount of an ethyl ether catalyst are divided into a large number of small blocks or placed in a large number of net-shaped containers and dispersed and arranged on the concrete structure surface, and then the interior is installed from above. The member is pressed to fix the interior member to the surface of the concrete structure together with the leveling.

Hereinafter, the present invention will be described in detail. The urethane prepolymer used in the leveling material of the present invention is a one-part moisture-curable type and has an isocyanate group at the terminal obtained by reacting a polyol with a polyisocyanate. Examples of the polyol include low molecular polyols (eg, ethylene glycol, propylene glycol, glycerin, etc.), amines (eg,
Polyether polyols obtained by adding alkylene oxides (eg, ethylene oxide, propylene oxide, etc.) to ethylenediamine, diethylenetriamine, tolylenediamine, etc.) or polyphenols; low molecular weight polyols and dicarboxylic acids (eg, adipic acid, phthalic acid) A polyester polyol obtained by a dehydration condensation reaction with an acid or the like); lactones (for example, γ
-Butyl lactone, ε-caprolactone); polylactone polyol by ring-opening polymerization of tetrahydrofuran; polytetramethylene glycol by ring-opening polymerization of tetrahydrofuran; castor oil or an alkylene oxide adduct thereof; and a polymer of a diene compound such as butadiene and isoprene. And a polydiene polyol having a hydroxyl group at a terminal or a hydrogenated product thereof, and these are used alone or in combination of two or more.

On the other hand, examples of polyisocyanates include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, p-phenylene diisocyanate and polyisocyanate. Aromatic polyisocyanate such as methylene polyphenylene polyisocyanate; aliphatic polyisocyanate such as hexamethylene diisocyanate; alicyclic polyisocyanate such as 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate; aryl such as xylylene diisocyanate Aliphatic polyisocyanates; and carbodiimide-modified or isocyanurate-modified polyisocyanates thereof, and the like. It is used as a seed or a combination.

In order to obtain a urethane prepolymer having a terminal isocyanate group, the blending ratio of the above polyol and polyisocyanate is usually 1.2 to 10 equivalents, preferably 1.5 to 5 equivalents, per equivalent of the polyol. This reaction is usually achieved by heating and stirring at 30 to 120 ° C. The viscosity of the urethane prepolymer is not particularly limited, but usually the viscosity at room temperature is 10 to 20.
00P, particularly preferably 20 to 500P.

[0008] The foam used in the leveling material of the present invention may be an organic one such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer resin, polystyrene, polyurethane, ABS resin, vinyl chloride resin, polyvinyl chloride. Foams with a hollow interior made of a homopolymer or copolymer such as formal, acrylic resin, epoxy resin, phenol resin, urea resin, and silicone resin, and high molecular compounds such as cellulose acetate, cellulose, and rubber. Structures, foams having a large number of pores on the surface, etc., and inorganic materials, for example, calcined perlite, shirasu balloon, porous glass, hollow glass, mine pit, pumice, etc. The surface may be coated to close the holes in the surface. These are used alone or in combination of two or more. The size of these foams is not particularly limited, but is usually 0.05 to 10 mm, preferably 0.1 to 7 mm, and more preferably 0.2 to 5 mm. In addition, these particles may have the same particle size, or a mixture of a small object and a large object may be used. The apparent specific gravity of the foam is usually 1 or less, preferably 0.5 or less, more preferably 0.2 or less. If this is one or more, sufficient weight reduction cannot be obtained.

[0009] The leveling material of the present invention comprises 2 to 30 parts by volume, preferably 10 to 40 parts by volume of a urethane prepolymer and a catalytic amount of an ethyl ether catalyst per 100 parts by volume of a foam. It can be obtained by uniform mixing using a method such as a kneader. If the amount of the urethane prepolymer is less than 2 parts by volume per 100 parts by volume of the foam, the foam cannot be cured with sufficient strength.
If it exceeds 30 parts by volume, the gap between the foams cannot be secured sufficiently, there is no way for carbon dioxide gas to escape when the urethane prepolymer cures due to moisture, and the leveling material is swollen and the mounting position of the interior member is shifted. May occur.

In the leveling material of the present invention, an ethyl ether-based catalyst is used from the viewpoint of storage stability. Examples thereof include bis (dimethylaminoethyl) ether, bis (morpholinoethyl) ether, and bis (dimethylmorpholino). Ethyl) ether and the like, and used alone or in combination of two or more. The amount of the catalyst used is generally 0.01 to 100 parts by weight of the urethane prepolymer.
Although it is 5 parts by weight, in actual use, for example,
A short time of 5 to 30 minutes is desirable for fixing to the wall material, while a time of about 8 hours is not necessary for fixing to the floor surface. I just need. In the leveling material of the present invention, in addition to the above three components, a stabilizer, an antifoaming agent,
Antioxidants, colorants (pigments, dyes), fillers (calcium carbonate, titanium dioxide, etc.) may be added.

The leveling material of the present invention can be subjected to the leveling method as it is, but since the urethane prepolymer is coated on the surface of a lightweight foam, the urethane prepolymer is hand-coated due to its adhesiveness. May be difficult to handle. The present inventors have solved this disadvantage by filling the netting container with a leveling material. FIG. 1 shows one embodiment of the present invention in a front view (FIG. A) and an enlarged longitudinal sectional view (FIG. B) taken along the line AA of FIG. It is a mesh container. In this configuration, the leveling materials are gathered in a net-like container, handling is facilitated, and the leveling materials protruding from the mesh are brought into contact with and fixed to the respective surfaces of the concrete structure and the interior member. Examples of such a net-like container include a natural fiber, a synthetic fiber knitted in a net, a net formed from a synthetic resin material, a cut in a film to form a net, and the like, in a bag shape or a cylindrical shape. An example of a commercially available product is Dai-Planetron (trade name, manufactured by Dai Nippon Plastics Co., Ltd.). Among them, those having elasticity are preferable. The size of the mesh of these mesh containers is not particularly limited, but is preferably slightly larger than the foam used.

In the leveling material of the present invention, a mixture of each component may be directly applied to a leveling method, or this mixture or the mixture placed in the mesh container may be further sealed and stored in a closed container. And may be taken out and applied as needed. When the leveling material is stored in a closed container, it is preferable to use a dried foam so as not to mix moisture, and to mix the mixture under an atmosphere of nitrogen gas or the like so that moisture in the air does not enter. When filling the container, it is necessary to take care not to allow moisture to enter. In addition, these containers have sealable cans, bottles,
Examples include aluminum-laminated plastic bags and cylindrical or tube-shaped plastic containers. FIG. 2 is a front view (FIG. A) and an AA thereof showing one embodiment of the sealed package.
This is shown in a vertical cross-sectional view (FIG. B) along the line of arrow. A tubular net-like container 3 containing a leveling material 1 of the present invention is spirally wound and sealed in an aluminum-laminated plastic bag 4. I have. In addition, 5 is a seal part.

In applying the leveling material of the present invention to the leveling method, the above components are mixed at the site where the interior member is fixed, and then divided into a large number of small fist-sized masses, or the mixture is mixed. Either the above-mentioned reticulated container filled as it is or the reticulated container cut to an appropriate size is dispersed and arranged on the surface of the concrete structure, and thereafter the interior member is pressed from above, and the concrete of the interior member is taken out together with the leveling. This is performed by fixing to the surface of the structure. Note that another adhesive, for example, a one-component moisture-curable urethane-based adhesive may be applied to the surface to which the leveling material is to be adhered.

[0014]

The urethane prepolymer is used not only for bonding foams but also for bonding concrete structures and foams. Ethyl ether-based catalysts are used to increase the curing speed of the urethane prepolymer and make the bonding time appropriate. The leveling material of the present invention is lightweight because it uses a foam. Because the urethane prepolymer is coated on the surface of the foam, the foam is displaced and deformed between the concrete structure and the interior member due to pressure, and the leveling of the interior member is facilitated,
The urethane prepolymer adhering to each foam is cured by the moisture in the air to fix each foam, and at the same time, the foam adheres to both the concrete structure and the interior member, thereby fixing both surfaces of the concrete structure and the interior member I do. The net-like container has the effect of facilitating the handling of the leveling material and has the effect of organizing the leveling material. When the leveling material is attached to the wall, it prevents the necessary level of thickness from being sagged by its own weight before curing. There is.

[0015]

EXAMPLES Hereinafter, specific embodiments of the present invention will be described with reference to examples, but the present invention is not limited thereto. The abbreviations in the examples mean the following. (Foam) ST-1: Eslenbead HE (manufactured by Sekisui Chemical Co., Ltd., trade name) was foamed into granules having a diameter of about 2 mm and an apparent specific gravity of about 0.2.
02 expanded styrene beads. ST-2: Eslen beads HE (same as above) were foamed to form granules having a diameter of about 7 mm and foamed styrene beads having an apparent specific gravity of about 0.018. ST-3: Ethylene beads HBY (same as above) is foamed styrene beads having an apparent specific gravity of about 0.018, which is formed into granules having a diameter of about 5 mm. P-1: baked pearlite having an apparent specific gravity of about 0.2. (Catalyst) BDM: bis (dimethylmorpholinoethyl) ether DME: bis (morpholinoethyl) ether

(Production of urethane prepolymer blend) Production Example 1 Polyether polyol urethane prepolymer: MEIW
AZOL CX-3H5 CONC (Meiwa Yuka Co., Ltd., trade name, NCO content: 16%, viscosity: 9000 cP (20 ° C)) 100 parts by weight of BDM
0.3 part by weight was added and stirred well to obtain a urethane prepolymer blend UP-1.

Production Example 2 Polypropylene ether glycol in a four-necked flask:
PPG-2000 (manufactured by Sanyo Chemical Industries, trade name, hydroxyl value)
After taking 700 parts by weight and dehydrating under reduced pressure while heating, 300 parts by weight of 4,4'-diphenylmethane diisocyanate: ISONATE 125M (trade name, manufactured by Mitsubishi Kasei Dow) at 60 ° C. is stirred. In addition, the reaction was further performed for 3 hours. Further, 1 part by weight of BDM was added and mixed for 1 hour to obtain a urethane prepolymer blend UP-2. NCO content 7%, 20
The viscosity at ℃ was 5000 cP.

Examples 1 to 10 and Comparative Examples 1 and 2 To a mixer replaced with dry nitrogen gas, a urethane prepolymer blend, a foam and other additives were added at the ratios shown in Table 1 and mixed well. Each of the obtained leveling materials was evaluated by the following method. The results are shown in Table 1.

(Evaluation Method) Tack Free Time The leveling material was packed in a cylinder having a diameter of 75 mm and a height of 5 cm, and was cured at room temperature. The time when the tack on the surface disappeared was defined as tack free time. Blistering In the samples for which the tack free time was measured, the blistering property was good when the difference between the height of the cured product after 24 hours and the height before curing was 2 mm or less, and the one exceeding 2 mm was bad.・ Adhesive strength The leveling material was placed on a gypsum board to a thickness of about 5 cm and cured. After 24 hours, the leveling material was pulled by hand.

[0020]

[Table 1]

Example 12 The leveling material of Example 3 was packed in an aluminum laminated plastic bag and stored at room temperature. Six months later, the bottle was opened and the tack-free time was measured, which was 25 minutes.

Example 13 The leveling material of Example 3 was packed in an elastic net of a large planetron (described above), made into a circular shape having a diameter of about 5 cm, and packed in an aluminum laminated plastic bag and stored at room temperature. Six months later, the bottle was opened and the tack-free time was measured, which was 25 minutes.

Example 14 The urethane prepolymer UP-1 of Production Example 3 was applied to a concrete wall, and a leveling material filled in the elastic net prepared in Example 11 was attached. The leveling material was coated with UP-1 and fixed by pressing a gypsum board. After 30 minutes, sufficient adhesive strength was obtained.

[0024]

The leveling material of the present invention does not need to be compounded before use in one component, and does not require any special technique, so that it can be applied to anyone. It is lightweight and easy to handle, has a short or long curing time, and has excellent storage stability. Further, since the hardening is performed in the applied state, the surface of the interior member does not shift from a predetermined position during the leveling method, and a uniform surface is always obtained.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a leveling material according to the present invention, wherein FIG. 1 (A) is a front view and FIG. 1 (B) is a view A of FIG.
FIG. 4 is an enlarged vertical sectional view taken along the line of arrow -A.

2A and 2B show another embodiment of the leveling material according to the present invention, wherein FIG. 2A is a front view, and FIG. 2B is a longitudinal sectional view taken along line AA of FIG. It is.

[Explanation of symbols]

1 ... leveling material, 2, 3 ... mesh container, 4 ... plastic bag, 5 ... seal part.

Claims (3)

(57) [Claims] 1. A polyurethane leveling material obtained by adding 2 to 30 parts by volume of a urethane prepolymer and a catalytic amount of an ethyl ether catalyst to 100 parts by volume of a foam and mixing them. 2. The polyurethane leveling material according to claim 1, wherein the mixture is filled in a net-like container. 3. A concrete structure in which a mixture of 100 parts by volume of a foam, 2 to 30 parts by volume of a urethane prepolymer and a catalytic amount of an ethyl ether catalyst is divided into a number of small lumps or placed in a number of net-like containers. A leveling method using a polyurethane-based leveling material, which comprises dispersing and disposing the interior member on the body surface, and then pressing the interior member from above, and fixing the interior member to the surface of the concrete structure together with the leveling.