JPS58217347A - Laminated panel and its manufacture - 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 laminated panel of a plastic plate and a glass plate, and a method for manufacturing the same.

Conventionally, various laminated panels have been proposed in which glass plates with excellent scratch resistance and chemical resistance are bonded to both sides of a lightweight and unbreakable plastic plate via an adhesive layer.

These laminated panels are made of relatively thick plastic sheets, and by making the glass sheets thinner, a lighter and safer /ζ panel can be obtained.

However, such laminated panels have the disadvantage that bubbles are generated in the adhesive layer of the laminated panels when used at temperatures above about 30°C.

As a result of intensive research on these laminated panels, the inventors of the present invention focused on the moisture contained in the plastic plates. Plastic plates usually have a moisture content of about o, i to O0j weight percent, although it varies depending on the type, and it has been discovered that the moisture contained in these plastic plates causes bubbles.

In other words, in order to obtain a laminated panel that is lightweight, hard to break, and has excellent scratch resistance and chemical resistance, the glass plate bonded to the outer surface has a high specific gravity, so it must be thin from the viewpoint of weight reduction. This is desirable. The glass plate is -mm or less, especially 1
Since it is necessary to ensure the rigidity of the laminated panel when the thickness is reduced to less than 1 mm, it is preferable to use a relatively thick plastic plate having a thickness of Q or J mm or more. The adhesive layer used to join such thick plastic plates and glass plates is
In order to prevent the glass plate from collapsing and breaking when an impact is applied to the laminated panel, the thickness must be approximately 200 μm or less.

When a laminated panel having such a structure is heated above about jO''C, the equilibrium vapor pressure of the water contained in the plastic plate becomes high, and the water evaporates from the surface of the plastic plate to the adhesive interface, resulting in foaming. Especially 0.j m as mentioned above
In a laminated panel that has a relatively thick plastic plate of 200 μm or more and a thin adhesive layer of 200 μm or less, the amount of water evaporated from the plastic plate is far greater than the amount of water that can be dissolved and absorbed by the adhesive layer, so foaming inevitably occurs. do.

The present invention has been made in order to eliminate the above-mentioned drawbacks.The present invention provides a laminated panel in which a glass plate is bonded to both sides of a plastic plate via an adhesive layer, and the moisture content of the plastic plate is 0. 0.01% by weight or less.

The water content of the present invention is 0.01% by weight or less, preferably 0.01% by weight or less.
0! Since the laminated panel uses plastic plates of less than % by weight, the temperature of the laminated panel increases and
Even if the temperature exceeds that level, foaming will not occur due to moisture evaporating from the plastic plate.

In the present invention, when using a thin glass plate on the outer surface for the purpose of reducing the weight of the laminated panel, in order to prevent the glass plate from collapsing and breaking due to the impact applied to the laminated panel,
The thickness of the adhesive layer, which is easier to deform than a plastic plate, is io.
It is necessary to set it below ottm.

In addition, since the present invention is usually made to obtain a laminated panel that is lightweight, hard to break, and has excellent scratch resistance and chemical resistance, the glass plate bonded to the outer surface is usually 1 mm or less, particularly preferably / mm or less, is used, so in order to ensure the rigidity of the laminated panel, the thickness of the plastic plate is preferably QJ mm or more.

Furthermore, in the present invention, it is preferable to use a polycarbonate plate, an acrylic plate, or a polyvinyl chloride plate as the plastic plate in order to impart transparency and rigidity to the laminated panel.

Furthermore, in the present invention, in order to prevent moisture from entering and diffusing from the edge surface of the laminated panel, the periphery of the laminated panel has a water permeability of QJmm and a thickness of 03 g/m2. +hr or less 2
It is preferable to seal with a sealing material having a thickness of ~3 mm.

The sealed laminated panel according to the present invention can prevent foaming in the periphery of the laminated panel due to an increase in the temperature of the laminated panel, while protecting the edges of the laminated panel.

The present invention also provides a method for manufacturing the laminated panel according to the present invention described above.

That is, the present invention is a method for manufacturing a laminated panel by laminating glass plates on both sides of a plastic plate with adhesive layers interposed therebetween and then autoclaving the plastic plates, in which the plastic plates are dried in advance so that the moisture content is 0.03% by weight or less. This is a method for manufacturing a laminated panel characterized by:

The present invention aims to reduce the moisture content of a plastic plate to 0.01% by weight or less, but such a plastic plate cannot be obtained with normal air conditioning at normal temperature and relative humidity of 50% or less. This can be achieved by heating at a high temperature of r2 or higher for 2 hours or more, by vacuum drying under reduced pressure, or by performing heating and reduced pressure simultaneously.

The present invention also uses K170 to seal the periphery of the laminated panel.
In "C", the periphery of the laminate panel can also be sealed by supplying a hot melt sealant with a viscosity of 3000 voids or less to the periphery of the laminate panel from a hot melt gun.

/ Melt a hot melt sealing material that melts at a temperature of 70'C or less, preferably 750C or less and has a viscosity of 3000 voices or less in a tantameter, and then heat the heated and insulated sealing material with a hot melt gun (the cross-sectional shape of the laminated panel A concave nozzle matching the above is preferable.) If the adhesive is supplied to the periphery of the laminated panel, it is easy to uniformly seal every corner of the periphery of the laminated panel.

As a sealing material, polyisobutylene with a Staudinger viscosity average molecular weight of r, 7oo-xi, ooo by weight ratio is /j-, 15%, and a hydrocarbon tackifier is 10 to 30%.
%, microtalistaline wax, 10-20%
A hot melt sealing material containing 0 to 70% of paraffin wax, 0P-70% of polyethylene wax, and 0 to 70% of a copolymer of polyethylene and ethyl acrylate (ethyl acrylate (less than 10% by weight)) is suitable. .

Hereinafter, the present invention will be explained in more detail with reference to Examples. A plurality of 149 mm polycarbonate plates soaked with JJwt% water were heated in a drying oven at 005 to 9
After drying for hours, the moisture content ranged from 0.11 to 0.01 kg weight %.
The water content was adjusted to 0/-% by weight (incidentally, the moisture content of the polycarbonate board in the room was about 0.2% by weight).

A thickness of approximately 60 mm is applied to the out-of-plane surface of these polycarbonate plates 3.
μm saturated polyester adhesive sheet (CoA.

-B) (manufactured by Nippon Gosei Kagaku Co., Ltd., product name rXPA-0211
J) of the same size through a 1mm glass plate (/A
, /B) and heated to approximately / , 20"C under reduced pressure of approximately J Otorr or less, approximately 7.3 Kg/C
Temporary adhesion was performed using a hollow rubber roll pressurized to m2. After that, at /20℃, 10K g/Cm 20 condition
Autoclaving was performed for 0 minutes to produce a laminated panel with no bubbles within the surface.

These laminated panels were left in a drying oven at 100''C for 60 hours or more, and the state of in-plane foaming was examined.

The results are shown in Table 1. fang! As is clear from the table, K.

No foaming was observed in the samples that were dried at 100"C for more than one hour and the moisture content was adjusted to below O,OS weight percent.

Example 2 An acrylic plate (manufactured by Sumitomo Chemical Co., Ltd., trade name "Sumibec") with a thickness of tmm x qt4/mm x ttsom was immersed in distilled water to have a water content of about 1% by weight, and after drying at 100°C, it was dried at about 4% by weight. A laminated panel was prepared in the same manner as in Example 1 by drying for hours and adjusting the moisture content to o, oswt, %. No foaming was observed in this laminated panel even when it was left at 100° C. for more than 10 days.

In addition, the same acrylic plate was dried at IO'0℃ for /J hours,
A laminated panel whose moisture content was adjusted to about 0.7% produced approximately 1 bubble per square oata in the same test.

Example 3 A polycarbonate plate measuring immxsoommx3oomm was dried to reduce the moisture content to approximately 0.055 wt% or less, and then a laminated panel was prepared in the same manner as in Example 1.

Around this sample, Staudinger viscosity average molecular weight of polyimbutylene (manufactured by Exxon Chemical Co., Ltd., trade name ``Vistanex MML-ZaQ'') 7,! ;
Polyisobutylene with a molecular weight of about 9,300 (manufactured by Exxon Chemical Co., Ltd., trade name [Vistaenox LM])
MSJ) J7wt%, tackifier Toshite, alicyclic tackifier (manufactured by Exxon Chemical Co., Ltd., product name "Escolenotsu!; 3
gOJ) 30. ! wt%, microcrystalline wax, (manufactured by Mobil Oil Company, product name [Microwax/J OJ) / Q wt%, paraffin wax (manufactured by Mobil Oil Company, product name [paraffin wax/3! SPL J)] 7.3 wt% , copolymer of polyethylene and ethyl acrylate (trade name: rNUc Otsu 2.20J, manufactured by Nippon Unicar Co., Ltd.) 7.3; wt
%, and the water permeability is 0. JO! ; g/m2-211
hr (0,!; mm thickness) using a hot melt sealing material with a melt viscosity of about 0.5 oz. at 1700C, MELTEX CR-0! ; Using a hot melt system, the periphery of the laminated panel was sealed to a thickness of 2 mm as shown in Figure 1.

This laminated panel was kept under high temperature and high humidity at 95% relative humidity for one week in SO'C, and then left in an atmosphere of 100"C for more than 11 hours. As a result, no abnormality was found in the laminated panel. When the same test was performed without sealing the periphery, many small bubbles were observed in the periphery.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a laminated panel according to the present invention.

Claims (1)

[Scope of Claims] 1. A laminated panel comprising a glass plate bonded to both sides of a plastic plate via an adhesive layer, characterized in that the moisture content of the plastic plate is 0.106% by weight or less. 2. The laminated panel according to claim 7, wherein the adhesive layer has a thickness of 200 μm or less. 3. The thickness of the plastic plate is 0. , gmm or more, the laminated panel according to claim 7 or 2. 4. The laminate according to claim 3, wherein the plastic plate is one selected from a polycarbonate plate, an acrylic plate, and a polyvinyl chloride plate; ．． ! ;g/m”
- The laminated panel according to any one of claims 7 to 4, which is sealed with a sealant having a water permeability of 2'l hr or less. 6. In the method of manufacturing a laminated panel by laminating glass plates on both sides of a plastic plate via an adhesive layer and then autoclaving, the plastic plate is dried in advance so that the moisture content is 0.01% by weight or less. A method for manufacturing a laminated panel characterized by: '7. The method for manufacturing a laminated panel according to claim 4, characterized in that the periphery of the laminated panel is characterized by supplying a hot melt sealant having a viscosity of 770"C and 3000 voids or less from a hot melt gun to the periphery of the laminated panel. .