JPS60138150A - Composite material for interior constitution - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite material for interior construction in which a concrete casting form is used as an interior material as it is.

Conventionally, in this type of composite material, the concrete casting surface of the decorative panel that also serves as a formwork has been provided with unevenness, fibrous twisted wires, or adhesives to bond with the poured concrete. Measures have been taken such as applying sand to the concrete and gluing insulating material on it, but in all of the above conventional methods, the processing of the panels is complicated and it is difficult to mix with the poured concrete. There were problems with integration,
The present invention has been proposed in order to eliminate such problems, and includes an impregnated film-like adhesive having a resin composition of ethylene-vinyl acetate-based resin, which is applied to a frame-cum-interior board made of fiber-reinforced gypsum board. The present invention relates to a composite material for interior decoration, which is characterized by being formed by layering an agent.

Now, if a composite material that is not layered with the above-mentioned impregnated film adhesive is set at a specified location and concrete is poured inside it, a breathing phenomenon will occur in the initial stage of setting of cement in the poured concrete. However, water in the concrete moves and accumulates at the interface between the concrete and the composite material, forming a separated water layer or a cement suspension layer, which inhibits the bonding and integration of the concrete and the composite material. In addition, if the composite material has high water absorption, it absorbs water at the interface excessively, hindering the hardening of the cement at the interface, and hindering the integration of the concrete and the composite material. Therefore, in order to control the interfacial water absorption characteristics of the composite material, an adhesive layer that can be mixed with the poured concrete and impregnated into the composite material and has a high affinity for both is applied to the main body of the composite material as in the present invention. It is necessary to layer it on the formwork/interior board that makes up the structure.

In order to satisfy these requirements, the composite material for interior construction according to the present invention can be used as a formwork and interior plate, unlike conventional asbestos slate, concrete plates, and calcium silicate plates.
It uses fiber-reinforced gypsum board, which is an aggregate of crystals of industrial water gypsum, does not contain gelling substances such as cement matrix, and has a large pore radius. Therefore, it has excellent properties such as a high moisture dissipation rate and a low equilibrium moisture content.

Further, in the present invention, an impregnated film adhesive having a resin composition of ethylene vinyl acetate resin is used as the adhesive layered on the fiber-reinforced gypsum soil. Compared to vinyl acetate, acrylic, and other copolymers, the ethylene-vinyl acetate copolymer that makes up the adhesive has considerably less swelling and solubility in water and alkaline solutions, and has high water resistance. It has the excellent property of being alkaline.

Since the composite material for interior construction according to the present invention is constructed as described above, some of the moisture in the concrete poured inside the composite material is absorbed by the concrete poured into the concrete and the plate forming the main body of the composite material. It moves to the interface with the adhesive layered on the body,
It absorbs enough water to become the same adhesive, activates the adhesive, and the surface of the adhesive is saponified by Cα(OH)2 in the cement concrete to become ethylene vinyl acetate popal, which further increases its water resistance and alkali resistance. When it is saponified to become ethylene-vinyl acetate resin, 10H groups are generated on the surface, which increases the affinity and bonding properties with cement concrete and improves the bond between the poured concrete and the plate-shaped body. A strong adhesive force acts between them.

Furthermore, since the adhesive is an emulsion film, the residual excess water that has moved to the interface passes through the adhesive to an appropriate extent and is absorbed by the formwork/interior board made of the fiber-reinforced gypsum board. Ru.

At this time, in parallel with the curing of the poured concrete, concrete IJ
- Excess moisture in the mold will quickly dissipate to the outside, and if the formwork and interior plate is not air-dried, it will cause problems in finishing the plate, such as painting, cloth pasting, tiling, etc. However, this will also impede the shortening of the construction period, but since the plate-shaped body is made of fiber-reinforced gypsum board, which has a high moisture dissipation rate as described above, the moisture absorbed by the plate-shaped body is is quickly dissipated to the outside, allowing the plate-shaped body to be finished quickly and shortening the construction period.

The impregnated film adhesive having a resin composition of ethylene vinyl acetate resin constituting the adhesive layer has excellent properties as described above for both cast concrete and the plate-like body made of fiber-reinforced gypsum board. Since it has adhesive properties, the composite material for interior decoration according to the present invention is integrally bonded to the poured concrete surface.

The drawings show the state in which the composite phase for interior construction according to the present invention is used. (A) is an aggregate of crystals of industrial water gypsum, which does not contain any gel material, has a small pore radius, and has no water escape. For formwork and interior use, made of fiber-reinforced gypsum board, which has excellent characteristics such as fast dispersion rate, low equilibrium moisture content, small dimensional change due to temperature and humidity, good workability, and relatively high strength. Composite material (A) for interior construction made by layering an impregnated film-like adhesive (2) made of an emulsion of ethylene-vinyl acetate copolymer having a composition of 28 rrLOI of ethylene and 86 m01 of vinyl acetate on a plate-shaped body <11 (A) Then, as shown in Figure 1, set it in a predetermined position and set up a general temporary frame β) facing each other at a predetermined interval, and pour concrete (C) between both (A) (B1). After the poured concrete hardens,
Remove the temporary frame (B).

In Fig. 2, a pair of the composite materials (Al (A) are set in a predetermined position and adhesive (2) is layered between the two composite materials (A) (A) (Conc IJ -) ( C).

Next, an experimental example of the present invention will be given.

Thickness 10mm, moisture content 0.2%, water absorption rate 13%, length change rate 0.07%, bending strength when air-dried 260"9/blind 2,
The above case where an adhesive made of ethylene vinyl acetate copolymer emulsion is layered on the surface of a formwork/interior board made of fiber-reinforced gypsum with a bending strength of 130 KSMm2 when saturated with water, and concrete is poured. The adhesion strength between the plate and concrete was 8 to 10 KSE/m2, and the plate broke during the adhesion test.

As a comparative example, a concrete adhesion test was conducted for cases in which an adhesive other than the above-mentioned adhesive was layered on the plate-shaped body and in cases in which no adhesive was applied, and the adhesion strength was 2 to 3 KVcrn2. In the latter case 1-2 K9/crr
*2 also caused damage at the interface between the concrete and the adhesive.

Furthermore, as another comparative experiment example, the thickness was 12 mm and the moisture content was 16%.
, water absorption rate 60%, length change rate 0.15%, bending strength when air-dried 270 KycrrL2, bending strength when saturated with water 130
When an adhesive made of ethylene vinyl acetate copolymer emulsion is applied to a formwork and interior plate made of KMm20 reinforced calcium silicate plate, when an adhesive other than the same adhesive is applied, when no adhesive is used When a concrete adhesion test was conducted for the first example, the adhesion strength was 2 to 3.
K51/arb2, 2-3 KycIrL in the second case
2. In the sixth example, 0 to 1 KV-2, in the first example the interface between the plate and the adhesive, in the second example the interface between the concrete and the adhesive, and in the sixth example the interface between the plate and the concrete. In addition, lifting and peeling of the formwork material and concrete frame, which were not observed at all when fiber-reinforced gypsum boards were used, occurred in 10 to 20% of the total number in the first example, and 10 to 10% of the total number in the second example. ~60%, and in the sixth case, 80-100% of the total.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIGS. 1 and 2 are longitudinal cross-sectional views showing the state in which the composite material for interior construction according to the present invention is used. (A) Temporary frame (C) of composite material for interior construction
...Conch! J-) (1) Formwork and interior plate (2) Impregnated film adhesive agent Patent attorney 6 persons other than Kaihon Important Cultural Properties

Claims (1)

[Claims] A composite material for interior construction, characterized in that it is formed by layering an impregnated film-like adhesive having a resin composition of ethylene vinyl acetate resin on a formwork-cum-interior plate made of fiber-reinforced gypsum board.