JPH037207Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of an automobile windshield window using two-layer safety glass.

Laminated glass, which is made by laminating two glass plates with a polyvinyl butyral film, is widely used in automobiles and the like as a three-layered laminated glass that does not scatter fragments even if broken. Recently, as an alternative safety glass, a two-layer safety glass has been proposed in which one glass plate and one synthetic resin film are laminated.
This two-layer safety glass panel has a synthetic resin film placed on the inside of the vehicle, so even if the occupant's head comes into contact with the glass in the event of a collision and the glass shatters, the organic film acts as a protective layer to protect the glass from being shattered. This can prevent skin damage caused by debris. This type of safety glass plate is made by, for example, stacking a glass plate constituting a two-layer safety glass plate and a synthetic resin film, and further making the exposed surface of the synthetic resin film smooth and subjected to mold release treatment using silicone or the like. The pressed glass plates are stacked, this assembled laminate is placed in a pre-pressing bag, deaerated and pre-pressed, then this assembled laminate is placed in an autoclave and heat-pressed, and the glass plate and synthetic resin are bonded together. It is manufactured by bonding the film and removing the pressed glass plate. The two-layer safety glass plate 1 manufactured in this way is
For example, it is attached to a window frame 3 of an automobile body with the sealant 2, as shown in FIG. 1, with the synthetic resin film side facing the interior. However, current sealants and primers are designed to optimize adhesion between glass and metal, and are not necessarily suitable for adhesion between a synthetic resin film and metal as in the present invention. For example, according to various tests and studies, it has been found that due to the difference in the surface condition of the synthetic resin film and that of glass, or when mold release agents such as silicone are applied to the surface of the presser glass plate during crimping of assembled laminates, synthetic resin It has been found that transfer to the film surface may reduce adhesion to sealants and primers depending on conditions such as resin composition or manufacturing method.

Based on this knowledge, the present invention was devised as a result of various studies and examinations with the aim of providing a structure for attaching a double-layer safety glass plate type windshield to an automobile window without the above-mentioned drawbacks. The gist is an automobile windshield window in which a window glass plate is bonded to a window frame of an automobile body via a sealant or an adhesive, and the window glass plate has the above-mentioned structure on the opposite surface of the bonding surface between the glass plate and the glass plate. A sealant or a synthetic resin film whose adhesion with the adhesive is inferior to that of a glass plate is laminated, and a part or all of the synthetic resin film in the peripheral area is cut out to form a synthetic resin film missing part. is formed, the two-layer safety glass plate having at least a portion between a part of the edge of the synthetic resin film near the synthetic resin film missing part and the window frame. The present invention relates to an automobile windshield window characterized in that it is bonded and attached using a sealant or adhesive.

The present invention will be explained in more detail below.

In Figures 2 and 3, reference numeral 1 indicates a two-layer safety glass type window glass plate, and this window glass plate 1 is coated with a sealant 2 or adhesive such as urethane resin, polysulfide resin, silicone resin, butyl rubber, etc. It is attached to a frame 3, and a molding 4 is inserted into the gap between the edge of the window glass plate 1 and the window frame 3 to hide this gap and the edge of the window glass plate from the outside.

In the present invention, the window glass plate 1 is the glass plate 1
0 and a synthetic resin film 11 are laminated, and as shown in the figure, a part or all of the synthetic resin film 11 in the peripheral part is cut out to The size of the resin film 11 is the same as that of the glass plate 10.
The size of the synthetic resin film cutout 12 is smaller than that of the synthetic resin film. Generally, in a front window that is inclined so that the lower side of the window glass plate is located at the front of the car and the upper side is located at the rear of the car, the adhesive strength between the glass plate and the window frame at the lower side is lower than that at the upper side. In this invention, the adhesive strength between the lower edge of the two-layer safety glass plate and the lower window frame is more important than the adhesive strength between the two-layer safety glass plate and the lower window frame. In order to increase adhesive strength, a synthetic resin film cutout 12 is formed on the lower side of at least the two-layer safety glass plate. It is preferable to form this synthetic resin film cutout part 12 over the entire lower side of the two-layer safety glass plate from the viewpoint of adhesive strength and the work of forming the cutout part. There is no need to provide the synthetic resin film cutout portion on the lower side. Such synthetic resin film missing parts are not limited to the lower part of the two-layer safety glass plate,
It is more preferable to provide it around the entire circumference of the top and side parts from the viewpoint of improving adhesive strength, but if it is unnecessary, install it on the double layer safety glass plate part, the side part, or the top and side parts. It is not necessary to form a synthetic resin film-deleted portion partially or entirely.
The width A of the part in contact with the sealant or adhesive of such synthetic resin missing part is 5 to 20 mm, and sufficient adhesive strength between the two-layer safety glass and the window frame to which the safety glass is attached can be obtained. It is preferable to secure a width that allows for

By forming the synthetic resin film-free portion as described above, the synthetic resin film itself of the two-layer safety glass plate,
Alternatively, a synthetic resin film on which a release agent such as silicone has been transferred and adhered from the presser glass plate surface used when crimping the two-layer safety glass plate is formed on the exposed surface of the two-layer safety glass plate. Therefore, if such a two-layer safety glass plate is attached to the periphery of a car window frame using a sealant or adhesive using its interior side periphery, the 2-layer safety glass plate will be damaged directly at least on the lower side of the plate. Since the surface of the glass plate on the side from which the synthetic resin film of the layer safety glass plate has been removed and the adhesive are bonded together, there is no decrease in adhesive strength as would be the case when a release agent is used.

In the present invention, when the two-layer safety glass plate 1 is attached to the window frame 3 of an automobile body through the sealant 2 or adhesive, the sealant 2 is attached to the synthetic resin film missing part 12 and the synthetic resin film 11 as shown in FIG. It is preferable to cover the edges of the In this way, synthetic resin film 1
By adhering and covering the ends of the window frame 1 with the sealant 2, it is possible to reduce the risk of the glass panel breaking and the two-layer safety glass panel coming off the window frame in the event of a collision. The width of the end of the synthetic resin film 11 covered by the sealant 2 is at least 5 mm or more so that the end of the synthetic resin film 11 can be sufficiently held by adhesion with the sealant 11.
Usually, it is preferable to set it to about 5 to 20 mm.

In the present invention, various inorganic glass plates can be used as the glass plates constituting the two-layer safety glass plate. Normally, a glass plate containing silica, sodium, and calcium as its main components called soda-lime glass plate, which is used as window glass for automobiles and other various vehicles, or for construction, is suitable, but depending on the purpose. is borosilicate glass, alumina silicate glass, lithium silicate glass,
Alimina silicate glass and other glasses can also be used. This glass plate may be a raw glass plate that is not reinforced, or may be a glass plate that has been strengthened by a physical strengthening method or a chemical strengthening method. Further, the glass plate may be colorless and transparent, colored and transparent, or partially opaque. In addition, glass plates that have been subjected to surface treatments that are commonly performed, such as colored coatings made of thin films of inorganic materials, heat ray reflective coatings, conductive coatings, and antireflection coatings, can be coated using vacuum evaporation, sputtering, etc. It is also possible to use one that is fixedly formed on the surface by a method such as a method or a printing method and is integrated with a glass plate.

In this case, in order to achieve the effects of the present invention, the glass plate formed by fixing and molding the above-mentioned thin film should have higher adhesion with the sealant or adhesive material at least at the bonded portion than the synthetic resin film. is necessary. This glass plate may be a flat plate or may be a glass plate bent into a desired shape. The thickness of the glass plate constituting such double-layer safety glass is not particularly limited, but the plate thickness is 1.5 mm or more, particularly 2.0 mm.
~5 mm is common.

In addition, various synthetic resin films can be used as the material for the synthetic resin film that constitutes the two-layer safety glass plate.
In particular, a strong synthetic resin with high impact resistance is preferred. The surface of the synthetic resin film that comes into contact with the glass plate is particularly preferably one that has high adhesion to glass because pressure bonding is easy. Synthetic resins that can be firmly bonded to glass by thermocompression bonding are thermoplastic resin films, such as polyurethane thermoplastic resins, polyvinyl butyral resins, polydiene resins, ethylene-vinyl acetate copolymer resins, polyolefin elastomers, Other thermoplastics and elastomers are suitable. Among these, polyurethane thermoplastic resins are most preferred in terms of transparency, impact resistance, penetration resistance, and other aspects. The polyurethane thermoplastic resin can be used not only for the part bonded to glass but also for the entire synthetic resin film or the main part of the synthetic resin film. For example, as shown in FIG. 5, the entire synthetic resin film may be made of a thermoplastic polyurethane film 11, or as shown in FIGS. 6 to 8, the glass side of the synthetic resin film may be made of a thermoplastic polyurethane layer 11a with excellent adhesive properties. Alternatively, as shown in FIG. 7, the synthetic resin film 11 is formed by a thermoplastic polyurethane layer 11a having excellent adhesive properties and a thermoplastic polyurethane layer 1 having excellent impact resistance and toughness.
1c may be combined.

Note that polyurethane thermoplastic resins have relatively low chemical durability such as surface solvent resistance and physical durability, so it is preferable to perform surface treatment to improve these durability, such as crosslinking treatment, or Alternatively, it is preferable to provide another thermoplastic resin layer with high solvent resistance or a thermosetting synthetic resin layer with high solvent resistance. For example, in the example shown in FIGS. 6 and 7, the polyurethane thermoplastic resin-free film 1
A polyurethane in which a functional group that can be crosslinked by heat, light, moisture, or the like is introduced into the surface of 1 in advance, before or during crosslinking, and the crosslinking improves durability such as solvent resistance. This figure shows a surface-crosslinked synthetic resin film 11b. Furthermore, in the example shown in FIG. 8, a thermosetting, photocurable, or moisture-curable crosslinked polyurethane layer 11d is provided on the surface of the polyurethane thermoplastic resin film 11a to improve durability such as solvent resistance. This is what I did.

The synthetic resin film is preferably transparent as a whole and has excellent optical properties. Like the glass layer, a portion of the synthetic resin film may be opaque, or it may be partially or entirely a colored transparent body. The overall thickness of the synthetic resin film is not particularly limited, but it should be 0.2 mm or more, especially
It is preferably 0.4 mm to 10 mm.

Next, embodiments of the present invention will be described.

A rectangular glass plate with a thickness of 3.0 mm and dimensions (500 mm x 1100 mm) with a thickness of 0.5 mm made by cross-linking the exposed surface.
A laminated glass assembly was prepared by overlapping a thermoplastic polyurethane film having the same dimensions as the above-mentioned glass plate. on the other hand,
After cleaning and drying an ion-exchange tempered glass plate with a thickness of 1.5 mm and the same dimensions as the above glass plate, it is immersed in a dimethylpolysiloxane solution to form a film made of dimethylpolysiloxane on the glass plate surface,
A pressed glass plate was prepared by drying and then baking at 350° C. for 30 minutes to form a release treatment film. Layer the pressed glass plate on the thermoplastic polyurethane film surface of the laminated glass assembly above so that the release-treated surface faces the polyurethane film surface, and place this assembled laminate in a pre-crimping bag to degas it. Preliminary pressure bonding was performed by heating to approximately 125°C. Next, this assembled laminate was placed in an autoclave and heated and pressurized at 13 atmospheres and 140°C to perform main compression bonding. Next, the assembled laminate that had undergone main compression bonding was taken out from the autoclave and allowed to cool, and the presser glass plate was peeled off to produce a two-layer safety glass.

Three double-layer safety glass plates were manufactured using the above method, one of which had a 5mm-wide synthetic resin membrane cutout formed around its entire circumference (Sample No. 1), and the other one had a synthetic resin film cutout formed around its entire circumference. A synthetic resin film trimming with a width of 15 mm was formed on the surface (Sample No. 2), and the remaining one was left as it was (Sample No. 3).

For sample No. 1, polyurethane sealant 2 was applied all around the 5 mm width of the missing part of the synthetic resin film and the edges of the synthetic resin film with a width of 7 mm, as shown in Figure 4a. Synthetic resin film 1 on test frame 12
It was joined and installed so that 1 faced the top. (This installation is called Type 1.) In addition, for sample No. 2, from the edge of the two-layer safety glass plate 1 in the 15 mm wide synthetic resin membrane missing part.
With a width of 12 mm, polyurethane sealant 2 is provided around the entire circumference of the synthetic resin film 11 so as not to cover the edges thereof, and the synthetic resin film 1 is placed on the test frame 12 as shown in FIG. 4b.
It was joined and installed so that 1 faced the top. (This installation is Type 2.) In addition, for sample No. 3, 10 mm from the edge of the two-layer safety glass plate 11 is attached to the entire circumference of the synthetic resin membrane side.
The polyurethane sealant 2 was applied with a width of , and was bonded and attached to the test frame 12 with the synthetic resin film 11 facing upward as shown in FIG. 4c. (This installation is referred to as Type 3.) The two-layer safety glass plates of Types 1 to 3 described above were tested by dropping a 10Kg head form specified in JIS R3212 from a height of 4m, and the results were as follows. Ta.

(i) Test results for Type 1 (Example of the present invention) Although the glass plate was destroyed, the two-layer safety glass plate did not come off the test frame and remained in place.

(ii) Test results for Type 2 (comparative example) At the same time as the glass plate was destroyed, a total of 70 cm in the longitudinal and short sides of the glass plate between the missing synthetic resin film and the sealant bonded area was destroyed. A large glass plate came loose from the frame.

(iii) Test results for Type 3 (comparative example) The glass plate was destroyed and peeled off for about 25 cm from the center of the sealant in the longitudinal direction, but the glass plate did not come off.

As described above, according to the present invention, the two-layer safety glass plate can be firmly bonded and attached to the window frame of a car, and when a car crash test is conducted, the two-layer safety glass plate can be firmly attached to the window frame. It is possible to reduce the risk that the windshield glass window will come off and the occupant will fly out of the window, and it is possible to provide a highly safe automobile windshield window.

[Brief explanation of drawings]

FIG. 1 shows a cross-sectional view of a windshield glass window for an automobile according to a comparative example, and FIG. 2 shows a vertical cross-sectional view of a two-layer safety glass plate used in the present invention. Figure 3 shows a longitudinal cross-sectional view of a windshield glass window for an automobile according to a specific example of the present invention.
Figure 4 shows an explanatory diagram of the test method,
5 to 8 are cross-sectional views schematically showing a cross section of a part of a two-layer safety glass plate used in the present invention. 1: 2-layer safety glass plate, 2: Sealant, 3:
Automobile window frame, 4: adhesive layer, 10: glass plate,
11: Synthetic resin film.

Claims (1)

[Scope of utility model registration request] In an automobile windshield window in which a window glass plate is bonded to a window frame of an automobile body via a sealant or an adhesive, the window glass plate is bonded with the sealant on a surface opposite to the bonding surface between the glass plate and the glass plate. Alternatively, a synthetic resin film whose adhesion with the adhesive is inferior to that of a glass plate is laminated,
Part or all of the synthetic resin film in the peripheral area is cut out to form a synthetic resin film missing part 2
A layered safety glass plate, the two-layered safety glass plate is arranged on a window frame so that the synthetic resin film of the two-layered safety glass plate is on the inside of an automobile, and the two-layered safety glass plate has at least a portion lacking the synthetic resin film. A sealant or adhesive is interposed between the glass plate surface of the removed part, a part of the edge of the synthetic resin film near the removed part of the synthetic resin film, and the window frame, and the window frame is joined and attached. Windshield glass windows for automobiles.