JPH06294167A - Thermal insulating board used for form - Google Patents

Abstract

PURPOSE:To obtain a thermal insulating board used for a concrete form with a multilayer having high adhesion strength at a low cost by using nonwoven fabric sheets having a large number of molten filmy parts. CONSTITUTION:Thermoplastic fibers are accumulated to form a sheet-like substance. After that, a plurality of projections heated in excess of the melting point of a fiber are pressed in the shape of a sheet, a part of the fibers is melted to make filmy, and nonwoven fabric sheets 3 are obtained. A thermal insulating board is obtained by laminating reinforcing sheets 2 and nonwoven fabric sheets 3 through adhesives 4 and S. The thermal insulating board is used for a concrete form and, at the same time, after the solidification, it is used for a thermal insulating material. Molten filmy parts are formed in the nonwoven fabric sheets 3, so that separation strength of the nonwoven fabric sheets 3 and concrete adhesion strength can be promoted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating board which also serves as a formwork for concrete driving, and more specifically, is formed by laminating a reinforcing layer and a concrete adhesive layer on a hard synthetic resin foam plate.
The present invention relates to a heat-insulating board that also serves as a formwork for concrete driving and has excellent adhesive strength and dimensional stability.

[0002]

2. Description of the Related Art When building a reinforced concrete structure or the like, a heat insulating board is used also as a formwork from the viewpoint of shortening the construction period, that is, even after concrete is placed and used as a formwork, concrete is hardened without being removed. In recent years, a heat insulating board driving method has been developed to function as a heat insulating material.

However, the heat insulating board used in this method must withstand the lateral pressure when concrete is poured in order to function as a formwork, and inevitably has a high strength hard plate on the surface of the heat insulating board. (For example, Class 1 plywood) must be attached. Furthermore, for outdoor use, it must have excellent dimensional stability against changes in the natural environment. However, in order to make a heat insulating board with excellent strength and dimensional stability,
Inevitably, the price will be high, and there is also the problem of wood resource overexploitation, which has been particularly highlighted in recent years.

Therefore, in order to solve such a point, a reinforcing layer, a moisture-proof layer, and a moisture-proof layer are formed on one or both sides of the hard synthetic resin foam.
Proposed is a heat insulating board that also serves as a mold and has a specific bending strength, which is obtained by attaching a soft surface material having at least a three-layer structure composed of an adhesive layer or a soft surface material having at least one layer structure of a reinforcing layer and an adhesive layer. (JP-A-61-294048 and JP-A-63-161241), and examples of the constituent material of the surface of the adhesive layer include carbon charcoal paper, aluminum hydroxide paper, glass nonwoven fabric, polyester nonwoven fabric and the like. .

[0005]

However, such a heat insulating board which also serves as a mold is not yet sufficiently satisfactory. That is, although carbon charcoal paper, aluminum hydroxide paper, glass non-woven fabric and the like used as the adhesive layer are expensive, and polyester non-woven fabric is relatively inexpensive, when using a normal non-woven fabric, satisfactory concrete adhesive strength is obtained. I can't get it.

Therefore, the present invention has been made in view of the above-mentioned conventional circumstances, and an object thereof is to provide a heat insulating board which also serves as a mold and which is inexpensive and has excellent adhesive strength to concrete.

[0007]

According to the present invention, there is provided a formwork-combined heat insulation board in which a reinforcing layer and a concrete adhesive layer are laminated in this order on a concrete driving surface of a heat insulation layer made of a hard synthetic resin foam plate, wherein the concrete is the above-mentioned concrete. Provided is a heat insulating board which also serves as a form, characterized in that the adhesive layer is made of a non-woven fabric sheet in which a large number of melted film portions are scattered on the sheet surface.

The heat insulating board which also serves as a formwork of the present invention comprises a non-woven fabric sheet comprising a reinforcing layer and a non-woven fabric sheet on which a large number of molten film portions are scattered on the concrete driving surface of the heat insulating layer made of a hard synthetic resin foam. Since the layers and the layers are laminated in that order, they are inexpensive and have excellent adhesiveness to concrete.

The formwork and heat insulating board of the present invention will be described in detail below. The basic layer structure of the heat insulating board which also serves as a mold of the present invention is shown in FIG. 1, for example. FIG. 1 shows that a reinforcing layer 2 is laminated on the concrete driving surface (both front and back sides in this case) of a heat insulating layer 1 made of a hard synthetic resin foam plate, and a concrete adhesive layer 3 made of a nonwoven fabric sheet is further laminated on the reinforcing layer 2. The configuration in the case of doing is shown. In FIG. 1, 4 is an adhesive layer for adhering the heat insulating layer 1 and the reinforcing layer 2 and 5 is an adhesive layer for adhering the reinforcing layer 2 and the concrete adhesive layer 3.

The heat insulating board of the present invention is characterized in that, as the non-woven fabric sheet constituting the concrete adhesive layer, one having a large number of melted film portions on the sheet surface is used. A non-woven fabric sheet having a large number of melt-filmed portions on the sheet surface is formed by stacking thermoplastic fibers by a conventional method to form a sheet-like material (web), and then heating a plurality of fibers at a temperature higher than the melting point of the fibers. It is obtained by pressing with a press platen or roll having such a protrusion to bond the fibers so that they do not fall off, and melting them to form a film.

The state of the sheet surface of this nonwoven fabric is shown in FIG. 3, for example. FIG. 3 is a diagram schematically showing a micrograph of the sheet surface of the non-woven fabric. In FIG. 3, the portion indicated by A is a portion formed into a melt film. It is preferable that the area of the melted film forming portion is 0.01 to ⁵ mm ² , and the number of the molten film forming portion per unit area (cm ² ) is 10 to 1,000. A nonwoven fabric sheet having a large number of portions formed into a melted film is commercially available (for example, trade name Stratec, manufactured by Idemitsu Petrochemical Co., Ltd.). The surface condition of the non-woven fabric sheet having no melted film portion is shown in FIG. 4, for example.

The nonwoven fabric sheet used as the concrete adhesive layer in the present invention has a large number of melted film portions on the sheet surface, whereby the peel strength in the thickness direction of the nonwoven fabric itself is improved. A heat insulating board using a sheet will have several steps of improved concrete adhesive strength. In addition, when using a non-woven fabric sheet without this melt-filmed portion, when the non-woven fabric sheet is pulled in the thickness direction, delamination occurs,
Concrete adhesive strength that can withstand practical use cannot be obtained.

As the non-woven fabric sheet constituting the concrete adhesive layer, any material can be arbitrarily selected as long as there are a large number of melted film portions on the sheet surface.
However, it is preferable to use a synthetic fiber non-woven fabric having alkali resistance because the adhesive strength of concrete such as glass fiber non-woven fabric having a weak resistance to alkali decreases after long-term use. As the synthetic fiber non-woven fabric, non-woven fabrics of all synthetic fibers such as polypropylene fiber, polyester fiber, polyamide fiber and the like can be used, but especially the use of polypropylene non-woven fabric, when forming a melt film forming portion on the sheet surface. It is preferable because the processing temperature can be lowered. Such non-woven fabric,
Generally, basis weight 30 to 100 g / m ² , thickness 0.2 to 1 m
The thing of about m is used.

In the heat insulating board of the present invention, this concrete adhesive layer adheres to the concrete on the one hand and to the interior material on the other hand. The concrete adhesive layer composed of the non-woven fabric sheet strongly adheres not only to concrete but also to GL bond, rubber adhesive, epoxy adhesive, mortar, etc. used as an interior material. Therefore, when the heat insulating board of the present invention is used, relatively heavy things such as tiles and mortar can be applied on the interior side.

In the heat insulating board of the present invention, a heat insulating layer made of a synthetic resin foam plate is used. Specific examples thereof include extruded expanded polystyrene board, rigid polyurethane foam, expanded phenolic resin board, expanded epoxy resin board, expanded urea resin board and the like. Of these, extruded expanded polystyrene board is particularly preferred from the viewpoint of water resistance. . Although the thickness of the heat insulating layer varies depending on the strength of the soft surface material including the reinforcing layer and the concrete adhesive layer, it is generally preferably in the range of 15 mm to 100 mm. Further, the density of the heat insulating layer is preferably about 0.025 to 0.1 g / cm ^{3 in} consideration of heat insulating performance and strength.

In the heat insulating board of the present invention, the reinforcing layer is first laminated on the driving surface of the heat insulating layer. As the reinforcing layer, for example, an impact-resistant polystyrene sheet or polyethylene having a thickness of 0.05 to 2.0 mm is used. It can be composed of a sheet, a polypropylene sheet, a polyester sheet, a biaxially oriented polystyrene sheet, a vinyl chloride sheet or the like.
Among these, impact-resistant polystyrene sheet is particularly preferable because it has high strength despite its low cost. With the reinforcing layer, the heat insulating board of the present invention can absorb the compressive tensile stress generated when concrete is poured, and can secure the dimensional stability against changes in the natural environment.

Since the heat insulating board of the present invention is used as a concrete driving form, it must have sufficient strength to withstand the lateral pressure of concrete. In order to obtain the strength of the heat insulating board of the present invention, it is necessary to appropriately combine the density of the hard synthetic resin foam plate and the thickness of the resin sheet used for the reinforcing layer, and to compare it with the low density foam plate. By combining a thick resin sheet with a high-density foam plate and a thin resin sheet, it is possible to obtain strength that can withstand concrete lateral pressure.

This concrete lateral pressure differs depending on the pouring speed, the pouring height, the hardening speed, the unit volume weight of the concrete, etc. of the concrete to be poured, and the thickness of the heat insulating board also depends on the required heat insulating performance, etc. When used as a concrete concrete formwork, the reinforcing layer resin sheet should have a tensile strength of 200 kg / cm ² or more, and the rigid resin foam board should have a bending strength of 5 kg / cm ² or more. preferable.

When the heat insulating board of the present invention is used as at least one of the molds of a concrete-cast formwork panel structure, the heat insulating board of the present invention is used as it is without using a control panel material as at least one of the molds. In addition, the board is not deformed, the heat insulating board is strongly adhered to the concrete as the concrete hardens, and a good heat insulating wall can be formed.

The heat insulating board of the present invention can be easily obtained by laminating a reinforcing layer sheet and a non-woven fabric sheet on a hard synthetic resin foam plate by a conventional method using a heat roll, an adhesive or the like. Therefore, it is excellent in productivity and also advantageous in cost. Further, since the heat insulating board of the present invention is lightweight and has a good cutting property on site, it has good workability in construction.

[0021]

EXAMPLES The present invention will be described in more detail below with reference to examples.

Example A heat insulating plate having a density of 0.050 g / cm ³ and a thickness of 25 m
m extruded polystyrene foam board, using a 0.2 mm thick impact-resistant polystyrene sheet as a reinforcing layer,
As a concrete adhesive layer, 0.2 mm on the sheet surface
The diameter of the molten film is 80 per cm ^2.
Polypropylene spun-bonded non-woven fabric (unit weight: 50 g / m ² , thickness: 0.39 mm) interspersed with each other was laminated with a hot-melt adhesive to obtain a heat insulating board also serving as a mold having the configuration shown in FIG. 1.

Comparative Example As a concrete adhesive layer, a general polyester-based non-woven fabric having no melted film portion (Basis weight 50 g /
A heat insulating board was obtained in the same manner as in the example except that m ² and thickness 0.5 mm) were used.

(Evaluation) With respect to the heat insulating board obtained above, the concrete adhesive strength was measured by the following method (cement mortar adhesion test method). The results are shown in Table 1.
Shown in.

Adhesion test of cement mortar Preparation method of sample A temporary frame was attached to a specimen (size 70 × 70 × 20 to 30 mm), and cement mortar (water / cement ratio 50
%) In a size of 50 × 50 × 10 mm. After the cement is hardened (about 14 days), the temporary frame is disassembled and used as a test sample. Test method As shown in FIG. 2, a measuring jig is attached to the cement mortar surface and a veneer plate is attached to the opposite surface with an adhesive respectively, the jig is fixed to the load cell and the veneer plate is fixed to the crosshead, and the test speed is 5 mm / min. A tensile test is performed to measure the peel load between the cement mortar and the sample surface.

[0026]

[Table 1]

From the results shown in Table 1, it can be seen that the heat insulating board which also serves as the mold of the present invention has excellent concrete adhesion.

[0028]

The heat-insulating board also used as a mold according to claim 1 is a heat-insulating board also used as a formwork, in which a reinforcing layer and a concrete adhesive layer are laminated in this order on the concrete driving surface of the heat-insulating layer made of a hard synthetic resin foam plate. Since the concrete adhesive layer is made of a non-woven fabric sheet having a large number of molten film portions scattered on the sheet surface, the following excellent effects are exhibited. Peeling between fibers is unlikely to occur in a non-woven fabric, and as a result, it is extremely excellent in concrete adhesion. Since it has sufficient strength as a formwork material, it can be used as a formwork when concrete is poured. (Labor saving and omission of work process) It is lightweight and has excellent workability because it is easy to cut on site. Since the reinforcing layer and the concrete adhesive layer can be continuously laminated, the productivity is excellent and the cost is low. Since the adhesive strength with GL bonds, rubber adhesives, epoxy adhesives, mortar and the like used for interior materials is also improved, relatively heavy materials such as tiles and mortar can be applied on the interior side.

The heat insulating board which also serves as a mold according to claims 2 and 3,
Since the rigid synthetic resin foam plate is an extruded expanded polystyrene board or / and the reinforcing layer is made of an impact-resistant polystyrene sheet, an effect of excellent strength and water resistance is added, and as a result, spring water or the like is adversely affected. It can be used even under conditions. Further, according to the combination of claims 2 and 3, the reinforcing layer can be laminated on the expanded polystyrene board by heat, and the processing cost can be further reduced.

Since the non-woven fabric sheet which is the surface layer is a polypropylene non-woven fabric sheet, the heat insulating board also used as the formwork has an effect of being excellent in alkali resistance, and as a result, is deteriorated even when it is contacted with concrete for a long period of time. There is nothing to do.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the basic layer structure of a heat insulating board that also serves as a mold of the present invention.

FIG. 2 is an explanatory view of a measuring device used for measuring the concrete adhesive strength of the heat insulating boards obtained in Examples and Comparative Examples.

FIG. 3 is an explanatory view schematically showing a micrograph showing a surface state of a nonwoven fabric sheet used as a concrete adhesive layer in the present invention.

FIG. 4 is an explanatory view schematically showing a micrograph showing the surface condition of a normal nonwoven fabric sheet.

[Explanation of symbols]

 1 ... Heat insulation layer 2 ... Reinforcement layer 3 ... Concrete adhesive layer

Claims (4)

[Claims] 1. A formwork / heat insulating board in which a reinforcing layer and a concrete adhesive layer are laminated in this order on a concrete-implanted surface of a heat insulating layer made of a hard synthetic resin foam plate, and the concrete adhesive layer is formed into a molten film on the sheet surface. A heat insulating board that also serves as a formwork, characterized in that it is made of a non-woven sheet with many scattered parts. 2. The heat insulating board serving also as a mold according to claim 1, wherein the rigid synthetic resin foam board is an extruded expanded polystyrene board. 3. The formwork / heat insulating board according to claim 1, wherein the reinforcing layer is formed of an impact-resistant polystyrene sheet. 4. The heat insulating board serving also as a mold according to claim 1, wherein the non-woven fabric sheet is a polypropylene non-woven fabric sheet.