JPS6223663B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminated panel having excellent heat resistance, abrasion resistance, weather resistance, and fracture resistance, which is constructed by laminating a glass plate on a plastic plate or a plastic laminate, for example.

The present inventors have already invented a glass-plastic laminate having sufficient fracture resistance using a thin glass plate of 2 mm or less, and the present applicant has filed a patent application for this invention. That is, in this case, a buffer layer made of soft plastic is laminated in a sandwich-like manner with hard polycarbonate plates to form a plastic laminate, and thin glass plates of, for example, 2 mm or less in thickness are placed on both outer surfaces of the laminate to a thickness of 0.5 mm. This is a laminated panel joined by the following adhesive layer. This product is made by gluing a thin glass plate to a plastic plate and reinforcing it from the back, and has sufficient fracture resistance.
It has sufficient fracture resistance even when the following thin glass plates are bonded together. These laminated panels are used in a wide range of applications such as sound insulation walls, partition walls, window panels, etc., and they have the advantages of glass, which has a scratch-resistant surface and is easy to remove dirt, and the light weight and flexibility of plastic. By laminating both types of materials, it is possible to increase the fracture resistance of the glass.

However, this laminate is a composite made by firmly adhering a glass plate and a plastic plate with an adhesive layer, and the physical and chemical properties of both remain intact, and these properties may not be compatible with each other. Therefore, it may not be possible to obtain the expected characteristics of the composite. One of the problems is that the laminated composite itself lacks heat resistance strength. The reason for this is that plastic plates, especially polycarbonate plates, and glass plates have different coefficients of thermal expansion. Gluing a glass plate and a plastic plate or plastic laminate,
When this laminate is heated to a high temperature after the adhesive has hardened, the glass plate or adhesive layer will become distorted at a temperature lower than the heat resistance temperature of the lower constituent material due to the difference in thermal expansion coefficient between the two. This causes cracks and cracks. For this reason, the usable temperature of a laminated panel made of a thin glass plate and a plastic plate firmly bonded is limited to a temperature lower than the above-mentioned raised temperature.
This is up to a limited temperature below the heat resistance temperature of each material.

An object of the present invention is to eliminate the conventional drawbacks and provide a laminated panel of glass and other plate-like bodies that has sufficient heat resistance strength even when using thin surface glass. This panel is made of a glass plate with a thickness of 1 mm or less,
This is a laminated panel in which a plate-shaped body having a coefficient of thermal expansion different from that of the glass plate is bonded with an adhesive layer having a thickness of 100 μm or less that maintains fluidity interposed between the opposing principal surfaces. The adhesive layer has the effect of reliably adhering the different types of plate-like bodies on both sides thereof, and maintains fluidity within the adhesive layer even after adhesion. The term fluidity as used herein refers to a material having a viscosity of 10 ³ to 10 ¹³ poise.

In the laminated panel of the present invention, the adhesive layer between the glass plate and other plate-shaped body maintains fluidity, so that when the panel is heated and the temperature is increased, both the above-mentioned types have different coefficients of thermal expansion on both sides of the adhesive layer. Even if each plate material undergoes its own thermal expansion, the difference in thermal expansion is absorbed and relaxed between the adhesive layers due to the fluidity maintained within the adhesive layer, and almost no stress is generated. Therefore, the temperature at which the laminated panel of the present invention can be used is the lowest among the heat-resistant temperatures of the respective materials constituting the panel. This temperature is much higher, typically 110°C, compared to the temperature at which cracks occur in any of the materials in conventional panels made of strongly bonded glass and plastics, at about 65°C. No cracks even after using it.

In the laminated panel of the present invention, the surface glass and plastic plate are closely bonded with an extremely thin adhesive layer, so even if an impact is applied to the surface glass plate, local deformation is prevented by the support of the plastic plate behind it. This also has the effect that the glass plate will not be damaged.

The present invention will be described in detail below with reference to the drawings showing embodiments. FIG. 1 shows an example in which a plastic laminate is used in the central part, and the laminate includes a buffer layer 2 of a soft elastic material such as silicone resin interposed between plastic plates 1A and 1B such as polycarbonate. It is what it is. Thin glass 4A,
4B is adhered to form a laminated panel. These adhesive layers 3A and 3B may be any material as long as it has sufficient adhesive strength as described above and maintains fluidity within the adhesive layer after adhesion. A suitable example is the product name "SH-200" manufactured by Toray Silicone Co., Ltd.
Alternatively, a silicone oil commercially available under the trade name "KF-96" manufactured by Shin-Etsu Chemical Co., Ltd. or a solvent-diluted wax-like silicone varnish such as "SR-2203" manufactured by Toray Silicone Co., Ltd. may be used.
The thickness of the adhesive layers 3A and 3B is determined by the thickness that prevents damage due to local deformation of the glass when an impact force is applied to the glass surface. In the case of a glass plate with a thickness of 2 mm or less, especially a glass plate with a thickness of 1 mm or less, when the surface glass receives an impact, the glass locally bends. At this time, if the adhesive layer is soft and the adhesive layer is thick, the glass will easily break, so in order to prevent this damage, if the glass plate thickness is 2 mm or less, the thickness of the adhesive layer must be 100 μm or less.
Especially when the glass plate thickness is 1mm or less, the layer thickness should be 60μ.
It is preferable to make it less than m.

In the embodiment of FIG. 1, the plastic plate 1A,
If the material of the buffer layer 2 between 1B and 1B is hard, the joint between the surface glass plate and the plastic plate will lose its flexibility, which will cause the glass plate surface to collapse and break if a local external force is applied. It is more likely to occur. Therefore, it is generally desirable to select a soft plastic material having a Young's modulus E of 300 Kg/cm ² or less, particularly 60 Kg/cm ² or less, as the buffer layer, taking into account the thickness of the glass plate and the plastic plate. In addition, when an impact external force is applied to one side of the panel, it reduces the strain that occurs on the surface glass plate on the opposite side and prevents damage.
The vibration damping coefficient of the buffer layer is 1 (per second) or more, especially 3
(per second) or more is desirable. A plastic laminate made with such a buffer layer will flex and deform appropriately when an impact is applied, and it has a rigidity that absorbs impact energy and a hardness that does not easily dent the point of impact. can be made to last. Therefore, a thin glass plate bonded to both sides of this laminate by means of a thin layer of said adhesive, such as silicone oil or silicone wax, not only withstands the impact forces applied to the glass surface, but also withstands the effects of heating. It also has better heat resistance than conventional laminated panels of this type.

The plastic plates 1A and 1B are selected from polycarbonate resin, hard vinyl chloride resin, acrylic resin, etc., and polycarbonate resin plates are particularly suitable because of their high impact resistance and high temperature resistance.

As mentioned above, the laminated panel of the present invention maintains fluidity in the adhesive layer between the glass plate and the plastic plate, so it can be used at higher temperatures than this type of laminated panel made of materials with different coefficients of thermal expansion. It has high heat resistance, high strength, and is lightweight, and has excellent wear resistance and weather resistance, making it suitable for soundproof walls, vehicle window panels,
Used for partitions, outdoor signboards, etc.

Example 1 Two sheets of polycarbonate resin with a size of 300 mm x 300 mm and a thickness of 2 mm. Silicone resin sheets with a thickness of 2 mm in 1A and 1B ("SYLGARD" manufactured by Dow Corning)
184'') on both sides of a plastic laminate board sandwiched with a buffer layer 2 of about 50 μm thick (silicone oil: Toray Silicone SH-200, viscosity approx.
10 ⁵ centipoise) 1mm thick through 3A and 3B
A laminated panel shown in FIG. 1 was prepared by bonding ordinary glass plates 4A and 4B together. This was placed in a drying oven at 110°C, but no discernible change occurred. In addition, when this panel was placed horizontally on a wooden frame and a 225gr steel ball was dropped from a height of 2.3m above the panel, no damage was observed to either the top or bottom glass plate. It was confirmed that the glass had the same breaking strength as a commercially available laminated glass made by laminating two glass plates with a polyvinyl butyral film.

Example 2 300mm instead of the plastic laminate of Example 1
× 300 mm On both sides of a 5 mm thick polycarbonate plate 1, 1 mm thick ordinary glass plates 4A and 4B are laminated via silicone oil adhesive layers 3A and 3B of about 50 μm as in the previous example, and the lamination shown in Fig. 2 is made. I made a panel. When the same heat resistance test as in Example 1 was conducted, no abnormality was observed at 110°C. Furthermore, even when a steel ball was dropped from a height of 1.2 m, no damage was observed to the glass plates on either the top or bottom of the panel.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views showing embodiments of the present invention, respectively. 1, 1A, 1B: plastic plate, 2: buffer layer, 3A, 3B: adhesive layer, 4A, 4B: glass plate.

Claims (1)

[Scope of Claims] 1. An adhesive layer that maintains fluidity and has a thickness of 100 μm or less is interposed between the opposing principal surfaces of a glass plate with a thickness of 1 mm or less and a plate-like body having a coefficient of thermal expansion different from that of the glass plate. A laminated panel made by joining together. 2. The laminated panel according to claim 1, wherein the plate-like body is a plastic plate, and the glass plate is bonded to both main surfaces of the plastic plate via the adhesive layer. 3. The laminated panel according to claim 1, wherein the plate-like body is formed by interposing a soft plastic plate between two hard plastic plates and joining them together. 4. The laminated panel according to claims 1 to 3, wherein the adhesive layer is made of transparent silicone oil or solvent-diluted wax-like silicone varnish.