JPH07150763A - Concrete formwork forming plate body - Google Patents

Abstract

PURPOSE:To provide a concrete formwork forming plate body capable of being repeatedly used many times by sticking a sheet made of a fiber-reinforced polyolefin resin and a foam board made of a polyolefin resin together. CONSTITUTION:A sheet 1 is molded with a polypropylene resin containing glass fibers, and polypropylene is foam-molded to prepare a foam board 3. A multi-functional epoxy resin and polyamine are used as main constituents to prepare a solvent-less, ordinary temperature hardening, two-liquid type epoxy adhesive 2. The adhesive face of the sheet 1 is flame-processed, the adhesive face of the foam board 3 is corona discharge-processed, then both adhesive faces are stuck together with an adhesive 2. A concrete formwork forming plate body having high physical strength and a good concrete releasing property and capable of being repeatedly used many times can be manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete form forming plate used in various construction works such as civil works and building works.

[0002]

2. Description of the Related Art Conventionally, as a plate-like material for forming concrete formwork (hereinafter simply referred to as formwork plate body), a wood board having excellent physical strength (for example, Japanese Agriculture and Forestry Standard, Ministry of Agriculture, Forestry and Fisheries Notification No. 1515). No.) are preferably used.
However, since the formwork plate made of a wooden board has a drawback that the mold releasability of concrete is poor, the work of chipping concrete is difficult and the durability is poor, so it is repeated only about 5 to 10 times. Could not be used. Therefore, in recent years, for example, Japanese Patent Laid-Open No. 2-1178
No. 24, Japanese Patent Application Laid-Open No. 2-8459, and a plate member for a mold formed of fiber reinforced plastic, and an actual flat plate 3
-113015, Japanese Patent Laid-Open No. 4-16242, Japanese Utility Model Publication No. 4
-42552, the practical use of the form plate made of foamed plastic or polyolefin resin is under study. In addition to this, for example, Japanese Patent Laid-Open No. 3-1
No. 61655 discloses a plate body for formwork in which a woven fabric or a non-woven fabric is laminated on a wooden plate, a metal plate, or a flat plate made of a synthetic resin, and a paint or a film is applied to the surface of the wooden plate. Attempts have also been made to improve releasability and durability by sticking.

[0003]

However, although the form plate made of fiber reinforced plastic is excellent in concrete releasability, it is thick and heavy in weight in order to obtain sufficient strength for the purpose of use. Would be very large, and would be extremely expensive, so it was not universal. Forming plate made of foamed plastic or polyolefin resin is excellent in workability (easy to handle) and concrete releasability, but it has low physical strength and is easily damaged. It was used less often.
On the other hand, the form plate made by laminating a woven or non-woven fabric on a wooden plate, a metal plate, or a synthetic resin is difficult to be used repeatedly due to its low surface hardness.Because it is composed of different materials, If it was not separated, it could not be recycled, which was very troublesome. In addition, a formwork in which paint is applied or a film having concrete releasability is pasted to surface-treat a wooden board can be manufactured at a relatively low cost and has excellent concrete releasability. Since the surface treatment layer is as thin as several hundred μm,
Since the surface is likely to be scratched during transportation or during concrete pouring, especially when it comes into contact with a rod that gives a vibrate, the mold releasability of the concrete is impaired, and thus the number of times that it can be repeatedly used is also small. Therefore, the applicant is
Previously, in Japanese Patent Application No. 5-272473, we proposed a technique for attaching fiber-reinforced thermoplastic resin to wood. Although this technique is extremely effective, it will become more difficult to supply wood in the future. Therefore, it is necessary to consider a countermeasure against it.

[0004]

The present invention solves the above problems without using wood that is difficult to supply, can be manufactured at low cost, has high physical strength, and has good concrete releasability. The invention provides a plate member for a mold which can be repeatedly used many times and can be easily recycled, and its structure is a sheet made of a fiber-reinforced polyolefin resin and a foam made of a polyolefin resin. The boards were glued together. Further, the same series of polyolefins is used as the fiber-reinforced polyolefin-based resin forming the sheet and the polyolefin-based resin forming the foam board, and further, a multifunctional epoxy resin and a polyamine are used as main components as an adhesive. This is because a solvent-free two-component epoxy adhesive having room temperature curability was used.

The fiber-reinforced polyolefin-based resin used in the present invention is a polyolefin-based resin filled with fibers and reinforced with various physical properties. The polyolefin-based resin referred to herein is a known thermoplastic resin obtained by polymerizing one or two or more of olefin-based monomers represented by C _n H _2n such as ethylene, propylene and butylene. The fibers are known fibers such as glass fibers, rock fibers, carbon fibers, alumina fibers, polyamide fibers, and polyimide fibers. Among such polyolefin resins, polypropylene is more preferable from the viewpoint that the balance between strength and toughness of the sheet can be improved, while manufacturing cost can be kept low among the fibers filled in the resin. From the viewpoints, etc., glass fiber is more preferable. Further, the fiber to be filled may be in a filament form or a strand form, but it is preferable to fill the long fiber form because the durability is improved. Further, the filling rate of the fibers in the resin varies depending on the true specific gravity of the fibers, but is preferably 1 to 50% by weight.

As the fiber-reinforced polyolefin resin used in the present invention, known pigments such as titanium oxide and carbon black, extender pigments such as calcium carbonate, clay and talc, antioxidants and ultraviolet absorbers are used, if necessary. Stabilizers can be added.

The thickness of the sheet formed of the fiber reinforced polyolefin resin is preferably 0.5 to 7.0 mm, particularly preferably 0.8 to 3.0 mm. If the thickness of the sheet is 0.5 mm or less, the strength and surface hardness of the composite form will be significantly reduced, and conversely, if it is 7.0 mm or more, cutting with a circular blade saw or the like at the work site. Sex decreases.

On the other hand, as the polyolefin resin forming the foam board, for example, a known polyolefin resin obtained by polymerizing one or more olefin compounds such as ethylene and propylene can be used. Among them, it is particularly preferable to use polypropylene because the foamed board can have a good balance of strength and toughness.

When forming a foam board, the expansion ratio is
It is preferably adjusted to 1.2 to 4.0 times. If the foaming ratio is 1.2 or less, cracks are likely to occur in the mold plate during nailing or sawing. On the contrary, if the foaming ratio is 4.0 or more, the mold plate is used. It is not preferable because the body tends to lack rigidity. As a method of foaming, for example, a known foam molding method such as a method of extruding a resin containing a foaming agent can be used.

The thickness of the foam board is preferably from 5 to 50 mm, and when it is 5 mm or less, it is difficult to obtain sufficient rigidity as a plate member for a mold. It is not preferable because it is inconvenient to handle.

If the fiber-reinforced polyolefin resin forming the sheet portion and the polyolefin resin forming the foam board portion are polyolefins of the same series,
It is preferable because the recycled product after disposal tends to have uniform physical properties. Furthermore, among such combinations of polyolefins of the same series, the combination of polypropylenes is particularly preferable because the strength balance between the sheet portion and the foamed board portion becomes good and the physical properties of the recycled product become more uniform.

Examples of the adhesive for adhering the sheet to the foam board include a polyolefin hot melt adhesive, a one-component or two-component epoxy adhesive, a urethane adhesive, and the like. , Epoxy-based adhesives and urethane-based adhesives are preferable. Further, among the epoxy-based adhesives, a two-pack type epoxy-based adhesive containing polyfunctional epoxy resin and polyamine as main components (hereinafter referred to as polyfunctional epoxy-polyamine-based adhesive) is preferable,
Among the urethane-based adhesives, a two-pack type urethane-based adhesive containing polyfunctional polyisocyanate and polyol as main components (hereinafter referred to as polyfunctional polyisocyanate-polyol-based adhesive) is preferable. Among them, it is the polyfunctional epoxy-polyamine adhesive that can exhibit the highest adhesive strength.

As the polyfunctional epoxy resin constituting the polyfunctional epoxy-polyamine adhesive, bisphenol A is used.
Cyclic fatty acid type epoxy resin, glycerin type epoxy resin (for example, Epicote 812 manufactured by Shell Chemical Co., Ltd.)
Etc.), dimer acid type epoxy resin and the like. Further, among them, those which are liquid at room temperature (about 20 ° C.) and have low viscosity are preferable. Examples of polyamines include known polyamines such as polyaminoamide compounds, aliphatic polyamines, cycloaliphatic polyamines and aromatic polyamines. The polyamine is also preferably liquid at room temperature (about 20 ° C.) and low in viscosity. Among these polyfunctional epoxy resins and polyamines, calcium carbonate, fillers such as clay, or plasticizers such as dioctyl phthalate and the like, if necessary,
A curing accelerator, a coloring agent, a defoaming agent, etc. can be added.

On the other hand, examples of the polyfunctional polyisocyanate that constitutes the polyfunctional polyisocyanate-polyol adhesive include known polyfunctional polyisocyanate compounds having an isocyanate group at the terminal. Examples of the polyol include polyester polyols. Well-known polyols such as polyether polyols and polycarbonate polyols can be mentioned. These polyisocyanates and polyols are also preferably liquid at room temperature (about 20 ° C.) and have a low viscosity, and if necessary, a filler,
A plasticizer, a curing accelerator, a coloring agent, a defoaming agent, etc. can also be added.

Further, in the present invention, among the polyfunctional epoxy-polyamine adhesives and the polyfunctional polyisocyanate-polyol adhesives, particularly, the mixing ratio of the organic solvent can be regarded as substantially solvent-free, which is 5% or less. It is preferable to use a solventless type, and it is preferable to use a room temperature curable type that cures in the range of 0 to 80 ° C.

When the sheet and the foam board are bonded, the surface of the bonding surface of both sheets is previously made to have a surface tension of 35 dyn / cm or more by a known surface treatment method such as corona discharge treatment or flame treatment. It is preferable that the adhesive strength is increased because the adhesive strength between the two can be increased. Further, it is particularly preferable to apply a urethane-based or epoxy-based primer immediately after the surface treatment because the adhesive strength can be further improved. .

The formwork plate of the present invention is not limited to one in which a sheet is attached to one side of a foam board, and it may be formed by attaching the sheet to both front and back surfaces of the foam board, or at least one side. Any number of layers may be laminated as long as the sheet has a structure exposed. When making a laminated structure of three or more layers in which the sheets are exposed on both front and back surfaces, injection molding may be considered if the sheets and foam board are simply laminated,
In the present invention, the adhesive force is increased to prevent delamination,
In order to improve the reliability of the product, it is necessary to adhere and laminate with an adhesive.

[0018]

[Function] Since the formwork plate has a structure in which a sheet made of a fiber-reinforced polyolefin resin is firmly attached to a foam board, the sheet portion has high physical strength and good concrete separation. The moldability is exhibited, and the foam board portion achieves weight reduction. Further, since the sheet portion has a high surface hardness and has an appropriate thickness, the surface is not easily scratched and the foamed board portion is not exposed, so that good concrete releasability can be maintained. Therefore, the plate body for molds of the present invention is excellent in workability and can be repeatedly used any number of times. In addition, since the sheet portion and the foam board portion are both formed of a polyolefin-based resin and exhibit good water repellency,
It does not absorb the water in the concrete and becomes heavy, and when it is discarded and recycled, it does not need to be separated.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. [Example 1] 1. Production of Formwork Plate (a) Sheet A 2.0 mm-thick sheet made of polypropylene resin containing 40% of glass fiber was used. (b) Foam board A foam board having a thickness of 10 mm and an expansion ratio of 3.0, which was obtained by foam molding polypropylene, was used. (c) Preparation of Adhesive A polyfunctional epoxy resin-containing composition and a polyamine-containing composition, each containing a filler and a colorant, were mixed to prepare a polyfunctional epoxy-polyamine-based adhesive.
The organic solvent content in the prepared adhesive was 5% or less. (d) Adhesion of sheet and foam board The surface of the above sheet is frame treated to reduce the surface tension to 5
Immediately after adjusting to 0 dyn / cm, a one-component urethane primer (Instar Bond X-12992, manufactured by Matsue Chemical Co., Ltd.) was applied, and the foamed board adhesive surface was frame-treated in the same manner as the sheet adhesive surface. , Surface tension 50dy
Adjusted to n / cm. After that, both adhesive surfaces are adhered by the above-mentioned polyfunctional epoxy-polyamine adhesive, and the thickness is about 1
A plate body for formwork of Example 1 having a size of 2 mm and a size of length × width of 1800 mm × 900 mm was obtained. The sheet and the foam board were adhered immediately after mixing the adhesive. The obtained form plate is shown in FIG. 1 is a sheet and 3 is a foam board. 2 is an enlarged view of a partial cross section of the form plate.
It was shown to. 2. Performance Evaluation of Formwork Plate The apparent specific gravity of the formwork plate of Example 1 was 0.45,
It was much smaller than the wood board, while the physical strength was good. Furthermore, as a result of forming a form using the form plate of Example 1 and using it for concrete pouring, it shows excellent concrete releasability and can be used 50 times repeatedly, and 50 times. Even after repeated use, although some scratches were observed on the surface, concrete adhesion was not seen, and it was in a state in which further repeated use was possible. Further, the obtained form plate was immersed in water for 24 hours, and the weight change before and after the immersion was examined. As a result, the weight change rate was 1% or less.

[Embodiment 2] 1. Production of Form Plate (a) Sheet The same sheet as in Example 1 was used. (b) Foam board The same board as in Example 1 was used. (c) Preparation of adhesive A polyfunctional polyisocyanate-polyol-based adhesive was prepared by mixing a polyfunctional polyisocyanate-containing composition and a polyol-containing composition, each containing a filler or the like. The organic solvent content in the prepared adhesive was 5% or less. (d) Adhesion of Sheet and Foam Board For the mold of Example 2, the sheet and the foam board were adhered in the same manner as in Example 1 except that the adhesive surface of the sheet was frame-treated and no primer was applied. I got a plate. 2. Performance Evaluation of Formwork Plate The obtained formwork plate of Example 2 had an apparent specific gravity of 0.45, which was the same as that of the formwork plate of Example 1, and had good physical strength. . Furthermore, as a result of using this plate to form a mold and using it for concrete pouring, as in the case of the plate for mold of Example 1, excellent concrete releasability is exhibited, and it can be used repeatedly 50 times. It was possible, and even after repeated use 50 times, some scratches were observed on the surface, but no adhesion of concrete was observed, and it was in a state where it could be used repeatedly. The rate of change in weight after immersion in water for 24 hours was also 1% or less, as in the case of the plate member for mold of Example 1.

As mentioned above, since the formwork plate of the present invention has excellent properties such as physical strength, it can be sufficiently used for purposes other than construction. deep.

[0022]

EFFECTS OF THE INVENTION Since the formwork plate of the present invention has high physical strength and good mold releasability of concrete, it is possible to reduce the work of chipping the adhering concrete, which conventionally requires a great deal of physical labor. And the number of times it can be used repeatedly
Compared with the conventional form plate, it can be greatly improved. In addition, the surface hardness is high, it is hard to scratch, and the flexible foam board is laminated, so it has excellent toughness and will never crack or crush even when subjected to a strong impact such as nailing. Can firmly hold a dripping nail. Moreover, since the formwork plate of the present invention is much lighter than that of a conventional wood board, it can be transported, installed,
It excels in workability such as cutting, and since it can be used as a substitute for a form plate made of a wooden board, it can also contribute to the protection of wood resources. Moreover, when it is discarded, it can be easily recycled without the trouble of separating each member.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a concrete form forming plate body of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of the concrete form forming plate body of the present invention.

[Explanation of symbols]

 1 ... sheet, 2 ... adhesive, 3 ... foam board.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Akira Shintani Akira Shintani, 1-3-3, Rokuno, Atsuta-ku, Nagoya City Matsu Sakae Chemical Industry Co., Ltd. (72) Toshiyuki Nakajima, Sakae 1-23, Sakae, Naka-ku, Nagoya Kiso Kogyo Co., Ltd.

Claims (3)

[Claims] 1. A plate for forming concrete formwork, comprising a sheet made of fiber reinforced polyolefin resin and a foam board made of polyolefin resin bonded together by an adhesive. 2. A concrete formwork forming plate according to claim 1, wherein the same series of polyolefins is used for the fiber-reinforced polyolefin resin forming the sheet and the polyolefin resin forming the foam board. 3. A solvent-free adhesive having a polyfunctional epoxy resin and a polyamine as main components as an adhesive and having room temperature curability.
The plate body for concrete formwork formation according to claim 1 or 2, wherein a liquid epoxy adhesive is used.