JPH05321448A - Non-combustible double floor panel - Google Patents

Abstract

PURPOSE:To provide e a non-combustible double floor panel lightweight, high in strength and easy to obtain double floor structure by curing cement-containing counter-emulsion formed of a vinyl monomer, water, cement and reinforcing fiber after molding this counter-emulsion. CONSTITUTION:A vinyl monomer, water, cement and reinforcing fiber are agitated and mixed under the existence of a normal counter-emulsifying agent to obtain counter-emulsion containing cement. After being extrusion-molded into plate shape by pressing, this counter-emulsion containing cement is inserted into a pressing machine with a metal mold mounted thereto and pressed to form a mold of desired shape integrally. This mold is cured to proceed with the hardened reaction of cement and the polymerized reaction of the vinyl monomer, and then dried to remove moisture, thus obtaining an integrally- molded double floor panel formed of cement-synthetic resin compound material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noncombustible double floor panel which facilitates underfloor wiring of office automation equipment and the like.

[0002]

2. Description of the Related Art In order to place wiring under the floor when arranging various office equipment, various types of double floor structures have been conventionally proposed. In particular, when the layout is changed after arranging various office equipment, it is necessary to rearrange the wiring under the floor, so that the double floor is often formed by combining block-shaped floor panel pieces.

As the block-shaped floor panel small pieces, a type in which a supporting member is attached to a lower portion of a floor plate, or an integrally molded floor plate and a supporting member is widely used. The former type has the advantage that various materials can be freely selected for the floor plate, but it is necessary to process the support member afterwards, and pre-process so that the support member can be attached to the floor plate. However, there is a drawback in that the manufacturing process is complicated because it is necessary to do so. Further, in the latter case, although there is no defect as in the former case, the material that can be molded is limited to synthetic resin and the like, and there is a problem in fireproofness and strength.

As a means for solving these problems to some extent, there is also a method of molding a block-shaped double floor panel small piece from cement-water slurry in which reinforcing fibers are added to cement. In this case, however, the block-shaped double floor panel obtained is obtained. There has been a problem that the floor panel pieces have a high specific gravity and are difficult to be post-processed. Further, when molding, it is necessary to reduce the viscosity of the cement-water slurry, and in that case, there is a problem in shape retention after molding. On the contrary, if the viscosity is increased, the shape-retaining property is improved, but unless the molding pressure is increased, the cement-water slurry does not reach all the corners of the mold. Furthermore, the commonly used reinforcing fibers such as glass fiber, synthetic fiber, carbon fiber and the like have poor affinity with cement-water slurry and the reinforcing effect is not sufficient, so that they cannot be used as a double floor panel.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to provide an integrally molded noncombustible double floor panel which is excellent in strength, productivity and workability.

[0006]

According to the present invention, a cement-synthetic resin composite containing reinforcing fibers is obtained by molding and curing a cement-containing inverse emulsion comprising vinyl monomer, water, cement and reinforcing fibers. An integrally molded non-combustible double floor panel is provided.

That is, the above cement-containing inverse emulsion has excellent fluidity at the time of molding and can be molded at a low pressure, and has excellent shape retention after molding, so that it is possible to integrally mold a double floor panel. Moreover, the obtained double floor panel has noncombustibility,
The present invention has been completed by finding that not only is it lightweight and high-strength, but it is also excellent in workability such as sawing.

The cement-containing inverse emulsion used in the present invention is a (meth) acrylic acid ester having a double bond in the molecule, vinyl monomer such as styrene and water, Portland cement, cement such as blast furnace slag, fly ash, etc., and synthetic. It is obtained by stirring and mixing reinforcing fibers such as fibers, glass fibers and carbon fibers in the presence of a usual inverse emulsifier.

The ratio of each component of the cement-containing inverse emulsion is 200 to 3 parts by weight of water based on 100 parts by weight of vinyl monomer.
000 parts by weight, 400 to 5000 parts by weight of cement, and 20 to 300 parts by weight of reinforcing fibers are preferable. Here, in the reverse emulsion, water is dispersed in the continuous layer of vinyl monomer, so if the ratio of cement to water is increased, the specific gravity is high but the strength is high. Conversely, the ratio of cement to water is increased. When it is lowered, it is light and has good workability.

The noncombustible double floor panel of the present invention can be manufactured, for example, as follows. First, the cement-containing inverse emulsion obtained by the above method is molded. This inverse emulsion has thixotropic properties and is excellent in fluidity and shape retention. Therefore, the molding method can be cast molding, press molding, extrusion molding,
Press molding is preferable from the viewpoint of the shape and productivity of the target block floor panel. In the case of press molding, for example, a cement-containing inverse emulsion is extruded into a plate shape, and then inserted into a press equipped with a mold and pressed, whereby a molded product having a desired shape can be easily integrally molded.

After the press molding, the mold is removed from the mold to obtain a molded product. Since the above cement-containing inverse emulsion has excellent shape-retaining property, it can be removed from the mold immediately after press molding. Then, the obtained molded product is cured to advance the hardening reaction of cement and the polymerization reaction of vinyl monomer, and then dried to remove water and integrally molded double-floor panel made of cement-synthetic resin composite. Is obtained. The floor panel thus obtained is nonflammable despite containing a synthetic resin (polymer of vinyl monomer).

[0012]

[Operation and effect] Since the cement-containing inverse emulsion is excellent in moldability as described above and also has excellent affinity with the reinforcing fiber, a lightweight and high-strength double floor panel can be obtained by using a small amount of the reinforcing fiber. It has the feature of being obtained. Further, since the volume shrinkage during curing is less than 1%, which is smaller than that of ordinary cement-water slurry molding, it can be molded with extremely high dimensional accuracy, and the obtained molded product has a workability that enables sawing. ing. Therefore, according to the present invention, it is possible to provide a non-combustible double floor panel which can be easily installed on site and has excellent fireproof property at low cost.

[0013]

The present invention will be described in detail below with reference to examples.
In this example, a four-legged floor panel having a side of 165 mm, a height of 50 mm, and a central portion thickness of 22 mm shown in FIG. Was evaluated by measuring. <1 point load fracture strength at the center of 4-point strut> The radius of curvature of the tip is 12.5 at the center of the noncombustible double floor panel shown in FIG.
The load was expressed by the load when the floor panel was broken by applying a load at a speed of 2 mm / min with a jig of mm. <Weight drop impact> When a weight of 1 kg is dropped from the height of 1.5 m on the floor surface of the non-combustible double floor panel shown in Fig. 1 and cracks reach the back surface: × Slight damage is recognized If observed: △ If almost no damage is observed: Judged according to the evaluation criteria of ○. <Non-flammability> The results measured according to JIS A1321 were evaluated.

Example 1 Obtained by dissolving 75 parts by weight of a styrene monomer as a vinyl monomer, 25 parts by weight of sorbitan monooleate as a reverse emulsifier and 1 part by weight of t-butyl perbenzoate as a polymerization initiator in a continuous kneader. Vinyl monomer solution, Portland cement, water and acrylonitrile fiber having a length of 5 mm were continuously fed at the composition ratio shown in Table 1 to form a cement-containing inverse emulsion, which was fed to an extruder to be thick on a pallet. Height 34 mm, width 160 m
m was extruded into a plate shape. Then, after inserting the pallet into a press equipped with a mold and press-molding with a press pressure of 1 kg / cm 2, the molded product is taken out of the mold and kept at 90 ° C. for 24 hours.
Steam-cured for an hour to obtain a non-combustible double floor panel of the present invention.
The properties of the obtained noncombustible double floor panel are shown in Table 1.

[0015]

[Table 1]

[0016]

[Brief description of drawings]

FIG. 1 is an example of a non-combustible double floor panel of the present invention and part 4 thereof.
It is a perspective view showing a 1 point load test method in the center of a point support.

[Explanation of symbols] 1 non-combustible double floor panel 2 central part 3 flat part 4 jig

Claims (1)

[Claims] 1. An integrally formed non-combustible double-layer made of cement-synthetic resin composite containing reinforcing fiber obtained by curing after curing a cement-containing inverse emulsion composed of vinyl monomer, water, cement and reinforcing fiber. Floor panel.