JP2000072512A - Laminated layer structure and its construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polymer cement laminated layer structure of a high durability and its construction method. SOLUTION: In this laminated layer structure and its construction, the substrate, the undercoat layer formed on the substrate surface, and the upper surface are laminated to give the objective laminated layer structure. The undercoat layer comprises a hydraulic cement, water, a polyol and an isocyanate and is formed by hardening the composition substantially containing no aggregate and has a thickness of >=0.5 mm. The uppercoating layer is formed by hardening a composition containing a polymer, a hydraulic cement, aggregate, water, polyol and isocyanate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated structure excellent in acid resistance, alkali resistance, heat resistance, impact resistance, and abrasion resistance, and a method for constructing the same.

[0002]

2. Description of the Related Art Conventional coated floor materials are generally made of urethane resin, epoxy resin, methyl methacrylate (MM).
A) system. However, when these are used for floors of food factories, machinery factories, chemical factories, and the like, they do not always have sufficient heat resistance, acid resistance, and alkali resistance, and there has been a demand for more excellent materials. Further, a material containing a large amount of a solvent or emitting a strong odor is not particularly preferable in a food factory or the like.

[0003] Therefore, a polymer cement composition containing hydraulic cement, aggregate, water, a polyol and an isocyanate compound has been proposed (JP-A-8-16974).
4). This polymer cement composition is prepared by mixing the above components on site to form a hydration reaction between water and hydraulic cement, a urethane reaction between a polyol and an isocyanate compound, and a urea reaction accompanied by the generation of carbon dioxide by the isocyanate compound and water. Are considered to proceed at the same time. The cured product after curing of the composition is hard, has excellent abrasion resistance, and also has heat resistance and chemical resistance, making it a durable material suitable for floors of factories, including food factories, machinery factories or chemical factories. It can be used as a floor material with excellent properties.

[0004]

However, in an actual site, the condition of the underlying concrete is greatly different from one another, and there are cases where the amount of moisture is large or the strength is not sufficient. When the above-mentioned polymer cement composition is directly applied to a foundation concrete having a large amount of moisture, pinholes and blisters are easily generated on the surface of the coating film due to the pressure of the moisture of the foundation moisture. If the strength of the groundwork is insufficient, the basement may be peeled from the fragile groundwork concrete due to deformation due to curing shrinkage of the polymer cement.

The polymer cement composition is usually spread with a thickness of 3 to 8 mm. However, since the resin component slightly floats on the surface during the curing after the application, it is considered that a smooth surface finish is obtained. I have. However, at this time, depending on the state of the base, pinholes or swelling may occur on the surface of the coating film due to the pressure of the water vapor of the base moisture.

In order to prevent pinholes and blisters on the surface of the coating film, a method of applying the polymer cement composition of 3 to 8 mm in two or more applications is considered. If the thickness is less than 3 mm, the aggregates protrude from the surface of the coating film, making it impossible to obtain a smooth surface appearance. Therefore, there has been a demand for an odorless undercoating material which can prevent the underwater moisture from being pushed up, has good workability and can be applied with a roller brush.

[0007]

SUMMARY OF THE INVENTION The present invention is the following invention which has solved the above problems. An undercoat, an undercoat layer provided on the undercoat surface, and a laminated structure including an overcoat layer provided on the undercoat layer surface, wherein the undercoat layer contains hydraulic cement, water, a polyol, and an isocyanate compound. And a layer having a thickness of 0.5 mm or more obtained by curing a composition containing substantially no aggregate, and the overcoat layer is formed of a polymer, a hydraulic cement, an aggregate, water, a polyol and an isocyanate. A laminated structure, which is a layer obtained by curing a composition containing a compound.

A composition containing hydraulic cement, water, a polyol and an isocyanate compound and containing substantially no aggregate is applied to a substrate and cured to a thickness of 0.5%.
mm or more, a hydraulic cement, an aggregate, water, a composition containing a polyol and an isocyanate compound is applied to the surface of the undercoat layer and then cured to form an overcoat layer. Construction method of laminated structure.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
In a method for constructing a laminated structure, a composition containing hydraulic cement, water, a polyol and an isocyanate compound and containing substantially no aggregate (hereinafter referred to as an undercoat material)
Is applied to the base. The undercoat material acts as a base filling material, and the undercoat material is cured to a thickness of 0.5 mm or more, preferably 0.5 to 2 mm, more preferably 0.8 to 0.8 mm.
By setting the thickness to 1.8 mm, it is possible to prevent the underwater from being pushed up and to eliminate pinholes and blisters on the surface layer.
Further, by applying the undercoat material to the undercoat, the peeling phenomenon is not observed even on the fragile base.

Preferably, the undercoat material is substantially solvent-free. Even if the solvent is not used, the viscosity is low and the fluidity is high. Therefore, even if the coating thickness is small, it can be easily applied by a roller brush.

The hydraulic cement used as a raw material of the undercoating material refers to cements which harden or set when mixed with water. Portland cement and fast setting cements with a high alumina content are preferred. Portland cement includes ordinary Portland cement, early-strength Portland cement, iron, and white Portland cement (white cement) which is a cement having a low carbon content.

The isocyanate compound used as a raw material for the undercoat material is not particularly limited, but a compound having two or more isocyanate groups is preferred. Organic polyisocyanates or isocyanate terminated prepolymers are preferred.

Examples of the organic polyisocyanate include aliphatic diisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate and xylylene diisocyanate, tolylene diisocyanate, diphenylmethane-4,4'-diisocyanate (MDI), and polyphenyl polyisocyanate (crude MDI). And aromatic diisocyanates. Further, a modified uretdione, a modified isocyanurate, a modified carbodiimide, or a modified buret may be used.

The isocyanate group-terminated prepolymer is preferably one obtained by reacting the above organic polyisocyanate with, for example, the polyol described below in an excess of isocyanate groups.

Although the content of the isocyanate compound in the undercoating material is not particularly limited, the hydraulic cement 100
10 to 100 parts by weight, preferably 10 to 100 parts by weight,
50 parts by weight is more preferred.

Water is essential in the undercoat material. The content of water in the undercoat material is preferably 5 to 500 parts by weight, more preferably 10 to 100 parts by weight, and particularly preferably 10 to 50 parts by weight with respect to 100 parts by weight of the hydraulic cement.

As the polyol used as a raw material of the undercoat material, ethylene glycol, propylene glycol,
Low molecular weight polyols such as 1,4-butanediol, 1,6-hexamethylene glycol, glycerin and trimethylolpropane, and polyether polyols and dicarboxylic acids obtained by polymerizing alkylene oxides such as propylene oxide and ethylene oxide using these as initiators Examples include polyester polyols obtained by reacting an acid with a low molecular weight glycol, and hydrophobic polyols such as castor oil-based polyols, polybutadiene-based polyols, and hydrogenated polybutadiene-based polyols. Hydrophobic polyols are preferred, and castor oil-based polyols are particularly preferred.

In the present invention, castor oil-based polyol refers to castor oil or a modified polyol obtained by further introducing a hydroxyl group into castor oil. The number of functional groups is preferably 2 or more, and more preferably 3. Specifically, Euri H-30 manufactured by Ito Oil Co., Ltd. (hydroxyl value 160 mgKOH / g,
Functional group number 3), Euri H-57 manufactured by Ito Oil Co., Ltd.
(Hydroxyl value 100 mg KOH / g, number of functional groups 3), Iric Oil Co., Ltd., Euryk H-52 (hydroxyl value 200 mg)
KOH / g and the number of functional groups 3) are preferred.

The content of the polyol in the undercoat material is as follows:
The amount is preferably 5 to 5,000 parts by weight, particularly preferably 10 to 250 parts by weight, per 100 parts by weight of the hydraulic cement.

The undercoat material may further contain a plasticizer, a surfactant and an antifoaming agent. It is preferable to contain a plasticizer. The plasticizer is not particularly limited, but specific examples include dibutyl phthalate, dioctyl phthalate, dinonyl phthalate, butylbenzyl phthalate, and dioctyl adipate.

The undercoating material of the present invention is characterized in that it contains substantially no aggregate. When an aggregate such as silica sand is contained, the undercoating material becomes heavy and the workability at the time of application deteriorates. Also, addition of a filler or the like is not preferable because it increases the viscosity of the undercoating material and deteriorates the workability during application.

The undercoat material is preferably produced by preparing an emulsion in which the above-mentioned water and polyol are dispersed in advance, further adding an isocyanate compound and a hydraulic cement, and mixing.

In the present invention, the above-mentioned undercoat material is applied to a substrate and then cured to have a thickness of 0.5 mm or more, preferably 0.5 to 2 mm, more preferably 0.8 to 1.8.
It is preferable to provide an undercoat layer having a thickness of 1 mm. If it is less than 0.5 mm, the sealing effect is insufficient, and it becomes difficult to completely eliminate pinholes and blisters on the coating film surface due to the pressure of the water vapor of the underlying moisture. If it exceeds 2 mm, the effect of the sealing property is maintained, but it is not preferable because it is difficult to apply a uniform thickness with a roller brush.

In the present invention, a composition containing hydraulic cement, aggregate, water, a polyol and an isocyanate compound (hereinafter referred to as an overcoat material) is applied to the surface of the undercoat layer and cured.

As the hydraulic cement used as a raw material for the overcoat material, the same ones as described for the undercoat material can be used. It is preferable to use the same hydraulic cement as the undercoat material and the overcoat material.

As the aggregate used as a raw material of the overcoating material, known inorganic aggregates or organic aggregates such as pulverized plastics can be used. Inorganic aggregates are particularly preferred. An inorganic aggregate having a particle size of 0.05 to 4 mm, particularly 0.1 to 1 mm is particularly preferred. River sand,
A material obtained by pulverizing a natural siliceous material such as silica sand or an inorganic material such as glass, ceramics, fused alumina, or silicon carbide can be used. Further, a hollow material such as a glass balloon or a shirasu balloon can also be used. These materials may be in a natural state, for example, artificially colored by using a dye or a pigment. The most preferred aggregate is silica sand.

The content of the aggregate in the overcoating material is preferably from 10 to 10,000 parts by weight, more preferably from 25 to 5,000 parts by weight, based on 100 parts by weight of the hydraulic cement.
Particularly preferred is from 00 to 1000 parts by weight.

As the isocyanate compound used as a raw material of the overcoat material, the same ones as described for the undercoat material can be used. It is preferable that the same isocyanate compound is used for the undercoat material and the overcoat material.

Although the content of the isocyanate compound in the overcoating material is not particularly limited, the hydraulic cement 100
10 to 100 parts by weight, preferably 30 to 100 parts by weight,
80 parts by weight are more preferred.

Water is essential in the overcoat material. The content of water in the overcoat material is preferably 5 to 500 parts by weight, more preferably 10 to 100 parts by weight, and particularly preferably 10 to 50 parts by weight with respect to 100 parts by weight of the hydraulic cement.

As the polyol used as a raw material of the overcoat material, the same polyols as described for the undercoat material can be used. It is preferable to use the same polyol as the undercoat material and the overcoat material.

The content of the polyol in the overcoat material is as follows:
The amount is preferably 5 to 5,000 parts by weight, particularly preferably 10 to 250 parts by weight, per 100 parts by weight of the hydraulic cement.

The overcoating material may further contain a plasticizer, a surfactant and an antifoaming agent. It is preferable to contain a plasticizer. The plasticizer is not particularly limited, but specific examples include dibutyl phthalate, dioctyl phthalate, dinonyl phthalate, butylbenzyl phthalate, and dioctyl adipate.

In the present invention, the overcoating material and the undercoating material preferably have substantially the same composition except for the presence or absence of aggregate.

The overcoating material is preferably prepared by previously dispersing water and a polyol to prepare an emulsion, and further adding and mixing an isocyanate compound, hydraulic cement and aggregate.

In the present invention, an overcoat material is applied on the undercoat layer and cured to provide a cured polymer cement layer of the polymer cement composition. The thickness of the overcoat layer is
2.5 to 20 mm is preferable, and 3 to 7 mm is particularly preferable. If the thickness is less than 2.5 mm, the impact resistance is insufficient, and as described above, the aggregate protrudes from the surface of the coating film, making it impossible to obtain a smooth surface appearance.

The laminated structure of the present invention is preferably provided with a floor of a factory, a floor of a building, a stair, a roof, or a pavement of a road as a foundation. In particular, floors that require durability, such as floors of food factories, machine factories, and chemical factories, are preferable.

[0038]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples and Comparative Examples, but the present invention is not limited to only these Examples.

<Evaluation Method> (1) Workability: An undercoating material was applied using a 5 mm short bristle roller brush, and the ease of spreading was evaluated. (2) Number of surface pinholes: The number of pinholes on the surface after applying and curing an undercoat material on a mortar plate of 300 mm square and 60 mm thickness, and then applying and coating an overcoat material and curing (unit: / 0. 09 m ² ). (3) Peeling state / warping state of coating film: After applying and curing an undercoat material on a 5 mm thick slate plate, applying a topcoat material again, leaving it at 20 ° C. for 7 days, and cutting it into 100 mm × 50 mm. After further curing at 80 ° C. for one day, the state of peeling of the coating film from the slate plate and the warping state of the coating film were observed.

The raw materials used are as follows. Castor oil A: (Euric H-30 manufactured by Ito Oil Co., Ltd .;
Hydroxyl value 160 mgKOH / g). Castor oil B: (Euric H-52, manufactured by Ito Oil Co., Ltd.)
Hydroxyl value 200 mgKOH / g). Isocyanate C: Crude MDI (MR-200 manufactured by Nippon Polyurethane Co., Ltd.). White cement: manufactured by Nippon Cement Co., Ltd. Cement water reducing agent: Naphthalene sulfonate formaldehyde condensate-based cement water reducing agent (Mighty 2000R manufactured by Kao Corporation).

Example 1 "Example" 30 parts by weight of water (hereinafter referred to as "parts"), 1 part of sodium lauryl sulfate, 35 parts of dioctyl phthalate, and castor oil A
Were mixed to obtain an aqueous dispersion of castor oil (this is referred to as an aqueous dispersion X).

100 parts of aqueous dispersion X, isocyanate C
Was uniformly mixed with 100 parts of white cement and 150 parts of white cement to produce an undercoat material. This was applied to each of a slate plate and a mortar plate using a roller brush so as to have a thickness of 1 mm, and was cured.

After 16 hours, 100 parts of aqueous dispersion X, 100 parts of isocyanate C, 150 parts of white cement, and silica sand No. 6 (particle size: 0.15 to 0.3 mm, the same applies hereinafter) 3
An overcoating material produced by mixing 50 parts was overcoated with a gold iron to a thickness of 5 mm and cured to obtain a two-layer laminated structure.

(Example 2) "Example" 30 parts of water, 1 part of sodium lauryl sulfate, 35 parts of dioctyl adipate, and 34 parts of castor oil B were mixed to prepare an aqueous dispersion of castor oil (this was mixed with an aqueous dispersion Y). To do).

100 parts of the aqueous dispersion Y, isocyanate C
Was uniformly mixed with 100 parts of white cement and 150 parts of white cement to produce an undercoat material. This was applied to a slate plate and a mortar plate using a roller brush to a thickness of 1.2 mm, respectively, and cured.

After 16 hours, 100 parts of the aqueous dispersion X, 100 parts of isocyanate C, 150 parts of white cement, and 350 parts of silica sand No. 6 were uniformly mixed, and an overcoating material was prepared by using a gold trowel to a thickness of 4 mm. Overcoat to a thickness of
By curing, a laminated structure composed of two layers was obtained.

(Example 3) "Example" 26 parts of water, 2 parts of a cement water reducing agent, 35 parts of butylbenzyl phthalate, and 36 parts of castor oil A were mixed to form an aqueous dispersion of castor oil (this was used as an aqueous dispersion Z). And).

100 parts of aqueous dispersion Z, isocyanate C
Was uniformly mixed with 100 parts of white cement and 150 parts of white cement to produce an undercoat material. This was applied to a slate plate and a mortar plate using a roller brush to a thickness of 1.5 mm, and cured.

After 16 hours, an overcoating material produced by mixing 100 parts of the aqueous dispersion Z, 100 parts of the isocyanate C, 150 parts of white cement, and 350 parts of silica sand No. 6 was coated with a 4 mm-thick gold trowel. And then cured to obtain a two-layer laminated structure.

Example 4 Comparative Example 100 parts of aqueous dispersion X, 100 parts of isocyanate C,
150 parts of white cement and 350 parts of silica sand No. 6 were mixed, and this composition was applied to a slate plate and a mortar plate so as to have a thickness of 5 mm using a gold iron, respectively, and cured to obtain a monolayer body. .

Example 5 Comparative Example 100 parts of aqueous dispersion X, 100 parts of isocyanate C,
And 150 parts of white cement were uniformly mixed to produce an undercoat material. This was applied to a slate plate and a mortar plate respectively using a roller brush so as to have a thickness of 0.3 mm, and was cured.

After 16 hours, an overcoating material prepared by mixing 100 parts of the aqueous dispersion X, 100 parts of the isocyanate C, 150 parts of white cement, and 350 parts of silica sand No. 6 was mixed to a thickness of 5 mm using a gold iron. And then cured to obtain a two-layer laminated structure.

Example 6 Comparative Example 100 parts of aqueous dispersion X, 100 parts of isocyanate C,
Undercoat material was manufactured by uniformly mixing 150 parts of white cement and 350 parts of silica sand No. 6. This was applied to each of a slate plate and a mortar plate so as to have a thickness of 2 mm using a roller brush, and was cured.

After 16 hours, an overcoating material produced by mixing 100 parts of the aqueous dispersion X, 100 parts of the isocyanate C, 150 parts of white cement, and 350 parts of silica sand No. 6 was coated with a 4 mm-thick gold trowel. And then cured to obtain a two-layer laminated structure.

Workability of the laminated structure obtained in Examples 1 to 6,
Table 1 shows the number of surface pinholes and the peeling / warping of the coating film.

[0056]

[Table 1]

[0057]

According to the present invention (Examples 1 to 3), when a composition containing the same components except for the overcoating material and the aggregate component is applied as an undercoating material, a resin comprising an overcoating layer and an undercoating layer is obtained. Peeling due to warpage of the layer and pinholes in the surface layer can be sufficiently suppressed, and it is suitable for applications where the finished appearance is particularly important.

Although the undercoating material is solventless, it has a low viscosity and a high fluidity, so that it can be easily applied with a roller brush even if the application thickness is small, and since it has no odor, its workability is also favorable. .

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) C04B 26:16)

Claims (4)

[Claims] 1. A laminated structure comprising an undercoat, an undercoat layer provided on the surface of the undercoat, and an overcoat layer provided on the surface of the undercoat layer, wherein the undercoat layer comprises hydraulic cement, water, polyol And containing an isocyanate compound, which is obtained by curing a composition substantially containing no aggregate,
It is a layer having a thickness of 0.5 mm or more, and the overcoat layer is a layer obtained by curing a composition containing a polymer, a hydraulic cement, an aggregate, water, a polyol and an isocyanate compound. A laminated structure. 2. The laminated structure according to claim 1, wherein the substrate is a factory floor, a building floor, a staircase, a rooftop or a road pavement. 3. A composition containing a hydraulic cement, water, a polyol and an isocyanate compound and containing substantially no aggregate is applied to a substrate and cured to a thickness of 0.5%.
mm or more, a hydraulic cement, an aggregate, water, a composition containing a polyol and an isocyanate compound is applied to the surface of the undercoat layer and then cured to form an overcoat layer. Construction method of laminated structure. 4. The method according to claim 3, wherein the polymer cement composition is substantially solvent-free.