JPH10102729A - Polyurethane leveling material, and leveling method using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyurethane leveling material and a leveling method which are capable of performing correct leveling and fixing of an interior decorative member even when a surface of a concrete structure is slightly uneven, rapid in hardening so as to enable the next work in the next day, free from generation of stain, mold, etc., caused by water content, light in weight, small in burden on a worker during carriage and transport, easy in distribution arrangement, sufficient in strength, and favorable in cost. SOLUTION: A polyurethane leveling material consists of 2-40 ps.vol. urethane polymer to the total 100 ps.vol. of the foamed body and non-foamed body and the ethylether catalyst of the catalytic quantity mixed therewith. In a leveling method using the leveling material, the polyurethane leveling material is arranged distributed and on a surface of a surface of a concrete structure, an interior decorative member is pressed against the surface to perform the leveling, and the interior decorative member is fixed to the concrete structure.

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 a concrete structure, in which an interior member is provided on the surface of the concrete structure so that the construction surface becomes flat. The present invention relates to a polyurethane leveling material for mounting and a leveling method using the same.

[0002]

2. Description of the Related Art Conventionally, in the construction of concrete structures such as condominiums and offices, after constructing a concrete structure, heat insulating and heat insulating materials, wooden boards, decorative boards, plywood, 2. Description of the Related Art An interior member such as a tile is attached and fixed. However, since the surface of the concrete structure has considerable irregularities, the distance from the interior member is generally not constant, and the gap may be as large as several cm. Conventionally, as a method of fixing the interior member to the uneven surface of such a concrete structure so that the construction surface becomes flat, 1) cement or gypsum plaster is kneaded with water or a synthetic resin emulsion and divided into a number of small blocks. These are dispersed and arranged in a state of being thickly raised on the concrete surface, and then the interior member is pressed and fixed from above, or 2) the foam and urethane preform described in Japanese Patent Application Laid-Open No. 6-173462 proposed by the present inventors. A method using a urethane leveling material made of a polymer is known. In these methods, small cement or urethane-based leveling material is deformed between the concrete structure and the interior member according to the gap, and the surface of the interior member is adjusted to a uniform plane (leveling).
While fixing.

[0003]

However, in the above method 1), a large amount of water or a synthetic resin emulsion is used to knead cement or gypsum plaster. For this reason, it takes several days to one week to cure and dry. During that time, the next construction cannot be performed, and the construction period is prolonged. If the finish is performed with insufficient drying, the level will go wrong, the moisture will come out and stains will occur, Or cause it to grow. In addition, cement and plaster plaster are heavy and put a heavy burden on workers. The method 2) is light in weight and easy to transport, and has no problem of generation of spots and molds because it does not use water, and has a high curing speed. However, in this method, when a material having a low specific gravity is arranged in a dispersed manner due to stickiness of the resin, it is difficult to put it on a hand or the like, and it is necessary to take measures such as packing in a net, which has a disadvantage that the construction is complicated. , Strength was not enough. Further, using a foam having a large specific gravity has a disadvantage of increasing cost.

[0004] Therefore, an object of the present invention is to enable accurate leveling and fixing of an interior member easily without adjusting the groundwork even when the surface of the concrete structure has some irregularities, and hardening is achieved. It is fast, and the next day, the next work will be started, there is no occurrence of stains and molds due to moisture, it is lightweight, the burden on workers during transportation and work is small, and the distribution is easy and the strength is sufficient An object of the present invention is to provide a polyurethane leveling material which is advantageous in cost and a leveling method using the same.

[0005]

According to the present invention, there is provided a polyurethane-based leveling material comprising 2 to 40 parts by volume of a urethane prepolymer per 100 parts by volume of a total of a foamed material and a non-foamed material, and a catalytic amount of an ethyl ether-based catalyst. The leveling method using this is a total amount of foamed and non-foamed materials, 2 to 40 parts by volume of a urethane prepolymer per 100 parts by volume of a urethane prepolymer and a catalytic amount of an ethyl ether-based catalyst. Are mixed and dispersed on the surface of the concrete structure, and the interior member is pressed against the surface to level the surface and fix the interior member to the concrete structure.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
In the leveling material of the present invention, first, a foam and a non-foam are used as main materials. When using foam and non-foam together, the strength of the leveling material after curing becomes larger and the level of the floor where heavy objects such as chests, pianos, etc. are placed, compared to foam with the expansion ratio adjusted alone. It can also be used as a starting material. The usage ratio of the foam and the non-foam differs depending on the apparent specific gravity and the particle size of the foam. Generally, the apparent specific gravity of the obtained polyurethane leveling material is in the range of 0.2 to 1, particularly in the range of 0.3 to 0.8. It is blended to be inside. If the apparent specific gravity is less than 0.2, the strength will be poor, and the leveling material will be sticky at the time of construction, impairing the workability. If it exceeds 1, sufficient weight reduction will not be achieved.

[0007] As the foam, organic materials such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer resin, polystyrene, polyurethane, AB
S resin, vinyl chloride resin, polyvinyl formal, acrylic resin, epoxy resin, phenol resin, urea resin,
Homopolymers or copolymers such as silicone resins, cellulose acetate, cellulose, a porous foam having closed cells or open cells made of a high molecular compound such as rubber, and inorganic materials such as calcined pearlite , Shirasu balloon, porous glass, hollow glass, mine pit, pumice, etc., and these are used alone or in combination of two or more. These foams may have a surface coated with a paint or the like in order to close pores on the surface.

[0008] The non-foamed material is a granular material other than a foamed material, and specifically, as an organic material, for example, polyethylene, polypropylene, ethylene-vinyl acetate copolymer resin, polystyrene, polyurethane, ABS resin , Vinyl chloride resin, polyvinyl formal, acrylic resin,
Epoxy resin, phenol resin, urea resin, homopolymer or copolymer such as silicone resin, cellulose acetate, cellulose, granules composed of high molecular compounds such as rubber, non-foamed, and inorganic , For example, natural particles such as sand, metal particles such as iron and aluminum,
Glass beads and the like can be mentioned, all of which are used alone or in combination of two or more.

The size of the particles constituting these foams and non-foams is not particularly limited, but those having a particle size of usually 0.05 to 10 mm, preferably 0.05 to 7 mm, more preferably 0.05 to 5 mm are used. Can be These particle sizes may be uniform or a mixture of large and small particles may be used.

The urethane prepolymer used as the second component is a one-part, moisture-curable type and has an isocyanate group at the terminal obtained by reacting a polyol with a polyisocyanate. The amount of the urethane prepolymer used in the leveling material is 2 to 40 parts by volume, preferably 10 to 30 parts by volume, based on 100 parts by volume of the total of the foamed and non-foamed materials. If the amount is less than 2 parts by volume, the granular material cannot be cured with sufficient strength, and if it exceeds 40 parts by volume, the gap between the granular materials cannot be sufficiently secured, and when the urethane prepolymer is cured by moisture, There is no escape route for the generated carbon dioxide gas, and the leveling material may be swollen and the mounting position of the interior member may be shifted.

Examples of the polyol include low molecular weight polyols (eg, ethylene glycol, propylene glycol, glycerin, etc.), amines (eg, ethylene diamine, diethylene triamine, tolylene diamine, etc.) and polyphenols, and alkylene oxides (eg, ethylene oxide). , Propylene oxide, etc.); polyester polyols obtained by the dehydration condensation reaction of low molecular weight polyols with dicarboxylic acids (eg, adipic acid, phthalic acid, etc.); lactones (eg, γ- Polylactone polyol by ring-opening polymerization of butyl lactone, ε-caprolactone, etc .; polytetramethylene glycol by ring-opening polymerization of tetrahydrofuran; castor oil or its alkylene oxalate Iid adducts: Polymers of diene compounds such as butadiene and isoprene, and polydiene polyols having a hydroxyl group at the terminal and hydrogenated products thereof, and the like, and these can be used alone or in combination of two or more.

On the other hand, examples of the polyisocyanate 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 imide-modified or isocyanurate-modified polyisocyanates thereof. It is used in combination of two or more. Of these, aromatic polyisocyanates such as 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, p-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate, and carbodiimide- or isocyanurate-modified polyisocyanates thereof are preferred.

In order to obtain a urethane prepolymer having an isocyanate group at the terminal, the mixing ratio of the above polyol and polyisocyanate is usually from 1.2 to 10 equivalents of polyisocyanate per equivalent of polyol, preferably from 1.5 to 5 equivalents.
Is equivalent. 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 has a viscosity at room temperature of 10 to 20.
00P, preferably 15 to 1000P.

In the leveling material of the present invention, an ethyl ether catalyst is used from the viewpoint of storage stability. This includes
For example, bis (dimethylaminoethyl) ether, bis (morpholinoethyl) ether, bis (dimethylmorpholinoethyl) ether and the like can be mentioned, and these are used alone or in combination of two or more. The amount of catalyst used varies depending on the type of catalyst, but generally, the urethane prepolymer 100
It is preferably 0.01 to 5 parts by weight based on parts by weight. In actual use, for example, a short time of 5 to 30 minutes is desirable for fixing the wall material, while a very fast curing is not necessary for fixing to the floor surface, and it may be about 8 hours. It may be increased or decreased according to the curing time.

In the leveling material, in addition to the above components, if necessary, stabilizers, defoamers, antioxidants, flame retardants, coloring agents (pigments, dyes), fillers (calcium carbonate, titanium dioxide, etc.) ) May be added.

In preparing the leveling material, the foamed material and the non-foamed material, the urethane prepolymer and the ethyl ether-based catalyst as the main materials described above are successively or collectively combined in the above-mentioned amount ratio by a conventionally known method, For example, by uniformly mixing using a kneader or the like, the surfaces of the foam and the non-foam are coated with a urethane prepolymer. At the time of the above preparation, it is preferable that each component is dried and mixed under an atmosphere of nitrogen gas or the like so that moisture in the air does not enter.

After each component of the leveling material is mixed at the construction site, it may be directly applied to the leveling method, or the mixture may be sealed and stored in a moisture-impermeable container, and removed as necessary. May be applied. When filling in a moisture-impermeable container, it is necessary to take care not to allow moisture to enter as in the above preparation. Examples of moisture-impermeable containers include sealable cans, bottles, films of polyethylene, polypropylene, nylon, polyester, etc., bags, cylinders, and tubes obtained by laminating these films and paper with aluminum. And the like.

In carrying out the leveling method of the present invention, the mixture at the construction site or the opened material from the closed container is divided into a number of small fist-sized lumps and dispersed and arranged on the surface of the concrete structure. Press the interior member against
This is performed by fixing the level at the same time. In addition,
On the surface where the leveling material is to be bonded,
For example, a one-component moisture-curable urethane-based adhesive may be applied.

[0019]

In the leveling material of the present invention, since the main material is composed of a foam and a non-foamed material, the leveling is achieved by the reinforcing effect of the non-foamed material as compared with the foaming material having the expansion ratio adjusted alone. The strength of the material after curing increases; urethane prepolymer cures due to moisture in the air and moisture contained in concrete, etc., and fixes foam and non-foam together. Ethyl ether-based catalyst has the effect of increasing the curing speed of the urethane prepolymer and setting the bonding time to an appropriate time. The apparent specific gravity of the foam and the non-foam is 1 The following mixture is lighter overall; the urethane prepolymer is coated on the surface of the foam and non-foam, so that the particles of the granular material are shifted by the pressure of the interior member. And shape to facilitate leveling of the interior member.

[0020]

EXAMPLES Hereinafter, specific embodiments of the present invention will be described with reference to examples and comparative examples, but the present invention is not limited to the description of the examples. (Production of urethane prepolymer) PPG-
2000 (manufactured by Sanyo Chemical Industries, trade name, polypropylene ether glycol, hydroxyl value 56mg-KOH / g) 700g
BYK-A 525 (B-Chemical Co., trade name, defoamer) 1g
After dehydration under reduced pressure while heating, at 60 ℃ ISONATE 125M
(4,4′-diphenylmethane diisocyanate, manufactured by Mitsubishi Kasei Dow) was added and stirred. After stirring and mixing for an additional 3 hours, 0.5 g of bis (morpholinoethyl) ether and 0.05 g of methanesulfonic acid were added at 50 ° C., and a further 1 hour was added.
The mixture was stirred and mixed for an hour to obtain a urethane prepolymer (UP-1).

(Preparation of Leveling Material) Examples 1 to 6 and Comparative Examples 1 to 4 Foams, non-foamed materials and the urethane prepolymer (UP-1) described below were blended in the proportions shown in Table 1. Mix well in a mixer replaced with nitrogen gas, and measure and evaluate each test item of tack-free time, swelling property, apparent specific gravity, and compressive strength of the obtained leveling material by the following method.
The results are shown in Table 1.

[Specifications of Components] (Foam) ST-1: Expanded styrene beads with an apparent specific gravity of 0.033 and a particle size of 1.3 to 2.6 mm obtained by expanding Eslen beads HE (trade name, manufactured by Sekisui Plastics) 30 times. -2: Foamed styrene beads with apparent specific gravity 0.02, particle size 1.6 to 3.1 mm, foamed 50 times of ethlen beads HE (same as above) ST-3: Crushed product of foamed styrene board, apparent specific gravity 0.03, particle size 1.0 to 1.5 mm・ ST-4: Expanded styrene beads (non-foamed) with an apparent specific gravity of 0.02 and a particle size of 1.2 to 2.4 mm obtained by foaming Eslen beads HCE (same as above) five times. Particle size 0.5 ~ 1.7mm ・ Quartz sand No.5: Rokuriya mining, apparent specific gravity 1.5, particle size 0.2 ~ 0.85mm

[Measurement / Evaluation Method of Test Items] Tack-free time: Leveling material is 4cm × 4cm × 4
It was packed in a mold having a size of cm and left to cure at 25 ° C. and a relative humidity of 60%. The time (minute) until the tack on the surface disappeared was defined as tack free time.・ Swelling property: For the sample whose tack free time was measured,
The difference between the height of the cured product after 24 hours and the height before the curing was less than 1 mm, and the difference was 1 mm or more. -Apparent specific gravity: The weight (g) and the length, width, and height dimensions (cm) of the cured product of the sample whose tack-free time was measured after 24 hours were measured, and were calculated by the following formula. Apparent specific gravity (g / cm ³ ) = (weight of cured product) / (length) ×
(Width) × (height) Compressive strength: Using the same mold as in the measurement of tack-free time, left for 24 hours under the same conditions to obtain a cured product having a size of 4 cm × 4 cm × 4 cm. Six days after demolding, a compression test was performed at a crosshead speed of 0.5 mm / min using a tensile tester manufactured by Shimadzu Corporation, and the strength (kg / cm ² ) at a displacement of 1 mm was measured.

[0024]

[Table 1]

Example 9 The leveling material of Example 1 was packed in an aluminum laminate bag and stored at room temperature. Even after 3 months, it could be used satisfactorily in the same manner as in the production without curing. After storage, the tack free time is 150 minutes, the swelling is good, and the compressive strength is 7kg / c.
It was m ^2.

[0026]

The leveling material according to the present invention can be applied to anyone without any special skills; it is lightweight and easy to handle, and the curing time can be arbitrarily adjusted by adjusting the amount of catalyst. In addition, it is excellent in storage stability; it cures in the installed state, so that the level of the interior member can be accurately leveled and fixed to the concrete structure without shifting from a predetermined position.

Claims (2)

[Claims] 1. A polyurethane leveling material obtained by mixing 2 to 40 parts by volume of a urethane prepolymer and a catalytic amount of an ethyl ether-based catalyst with respect to a total of 100 parts by volume of a foam and a non-foam. 2. A mixture of 2 to 40 parts by volume of a urethane prepolymer and a catalytic amount of an ethyl ether-based catalyst in a total amount of 100 parts by volume of a foamed body and a non-foamed body is dispersed and arranged on a concrete structure surface. A leveling method using a polyurethane-based leveling material, wherein an interior member is pressed against the surface thereof, and the interior member and the concrete structure are fixed together with the leveling.