JP3003738B2 - Resin plate bonding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for bonding a resin plate to another material having a different coefficient of thermal expansion, and preferably relates to a method for bonding a resin glass plate and a metal frame which are preferably used as a substitute for inorganic glass in automobiles. The present invention relates to a bonding method, particularly to a bonding method between a resin glass plate subjected to hard coating treatment and a metal frame.

[0002]

2. Description of the Related Art For example, when an inorganic glass for automobiles is generally mounted on a window frame, the peripheral portion of the inorganic glass is directly bonded to the window frame using a urethane-based adhesive having excellent adhesive strength.

[0003] Instead of the inorganic glass, an organic material such as an organic glass such as polycarbonate and acrylic, or an organic glass subjected to a hard coat treatment for imparting abrasion resistance to the material is also used. Has a coefficient of linear expansion of 7 compared to inorganic glass or metal frames such as steel frames.
Up to 8 times, on the other hand, urethane-based adhesives generally have high adhesive strength, but lack flexibility, so they cannot absorb the difference in expansion and contraction due to heating and cooling, causing distortion in the hard coat layer or organic glass, As a result, cracks are generated in the hard coat layer.

[0004] The present invention, including these, when bonding a resin plate and a different material having a different coefficient of thermal expansion with an adhesive,
An object of the present invention is to provide a method of bonding a resin plate that solves the above-mentioned problems.

[0005]

Means for Solving the problems] The present invention, a different heterologous materials resin plate and the thermal expansion coefficient, when the adhesive with an adhesive mating portion whole or a desired portion overlapping them, breaking elongation
Rate 400% to 1500%, tensile strength of 10kg / cm ² ~30kg / cm ² der
That the adhesive highly flexible, elongation at break of 200% to 500%,
The tensile strength is arranged alternately and adhesive-rich tensile strength is ^{40kg / cm 2 ~80kg / cm 2} , bonding, further, a resin plate and which should be supported metal frame, and a resin plate when adhesively bonded over the overlapping portion of the metal frame, and an adhesive-rich the flexible, arranged alternately adhesive rich the tensile strength, gluing, added 20 of adhesive gamut 50%, the soft <br/> placing the adhesive-rich flexible, preferably adhesive silicone rubber adhesive which is rich in the flexibility, adhesive-rich the tensile strength of one-component urethane is an adhesive, also,
It resin plate is polycarbonate-based or acrylic subjected to hard coat treatment, in addition, at the corner portion of at least a resin plate placing the adhesive-rich the flexible, made of.

The present invention is applied to the bonding between a resin plate and a dissimilar material having a different coefficient of thermal expansion. For example, the bonding between a resin plate and an inorganic glass, the bonding between an inorganic glass having a functional film, and a metal. It can be adopted in a wide variety of ways such as bonding with a plate, especially when a polycarbonate or acrylic resin plate hard coated is used as a substitute for inorganic glass for automobiles as described above, and its peripheral portion is bonded to a metal frame, for example, a steel frame. It can be suitably adopted. At that time, if the method of bonding the entire area with a urethane-based adhesive widely used for bonding inorganic glass for automobiles is directly employed, the adhesive lacks flexibility and has a high adhesive strength, so that a hard coat layer,
Alternatively, the resin plate may be distorted, causing cracks in the hard coat layer.

For example, when a car is exposed to insolation in the summer in a temperate zone, the temperature of the resin plate reaches 70 to 90 ° C., or in a cold region in the winter, it reaches -20 to -40 ° C. In many cases, the above-mentioned adverse effects are likely to occur.

According to the present invention, the occurrence of the above-mentioned distortion and cracks is suppressed by the buffering action of the highly flexible adhesive layer, while the adhesive layer having a high adhesive strength has the effect of maintaining the adhesive strength.

Of course, when bonding a very small resin plate, the difference in expansion from the steel frame is not so large.
For example, when one side of the resin plate is around 200 mm or 2000 mm or more, the bonding method of the present invention is effective.

The arrangement of the adhesive is basically based on the center portion of each side of the resin plate as a base point. It is preferable to employ it. Conventionally, cracks in the hard coat layer at the corners are not a little scattered, but by taking the above measures, it can be greatly reduced.

Since an adhesive having high flexibility does not itself have a high adhesive strength, it is not preferable to use an excessively large adhesive area, and the adhesive area should be 50% or less of the entire adhesive area. Although the lower limit depends on the size of the resin plate, the lower limit is 20
% Or less, and if it is less than that, the effect of suppressing the distortion and cracks lacks remarkable effect.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The bonding between a resin plate and a steel frame as a specific embodiment of the present invention will be described in detail below, but the present invention is not limited to this.

FIG. 1 is a side sectional view showing the relation between a resin plate (a polycarbonate plate as an example) and a steel frame in the present invention, wherein 1 is a resin plate, 2 is a steel frame, and 3 is a resin plate. 2 shows a superposed or bonded portion of a steel frame.

2 to 4 are plan views each showing an example in which each adhesive layer is disposed on a resin plate (steel frames are not shown). The overlapping portion, that is, the bonding portion is shown.

A1 to a4, a'1 to a'4, and a "1 to a" 4 indicate the locations of the highly flexible adhesives at the corners of the resin plate, respectively. An adhesive with high strength is arranged. Alternatively, in addition to the above, in consideration of the size of the resin plate and the like, a flexible adhesive b1 to b
4, one or a plurality of b'1 to b'4, b "1 to b" 4, etc. may also be arranged at appropriate positions on each side.

An adhesive having high flexibility has an elongation at break.
400-1500%, tensile strength is adopted as the order of 10 to 30 kg / cm ^2. As the adhesive having such properties, a silicone adhesive is generally suitable, such as Tosseal 380 (trade name, manufactured by Toshiba Silicone Co., Ltd.).

As the adhesive having high adhesive strength, an adhesive having an elongation at break of 200 to 500% and a tensile strength of about 40 to 80 kg / cm ² is employed. As an adhesive having such properties,
One-component urethane adhesives such as WS-55 (trade name, manufactured by Yokohama Rubber Co., Ltd.), SR Seal U80 (trade name, manufactured by Sunrise Meisei Co., Ltd.), and Solid Seal (trade name, manufactured by Sunstar Giken Co., Ltd.) can be recommended.

Example 1 1) Preparation of sample A black paint was applied to the periphery of a polycarbonate flat plate by screen printing, and both sides were made of, for example, an acrylic primer solution, and Toshiba Silicone Co., Ltd., trade name PH91, was nozzle flow coated. Coating method, and further apply a silicone-based coating solution as a hard coat layer, Tosgard 510 (trade name, manufactured by Toshiba Silicone Co., Ltd.), and dry to 800 mm in size.
A resin plate having a square shape of 400 mm and a thickness of 5 mm was prepared.

Since the black paint tends to impair the aesthetic appearance of the adhered portion, it is applied to the resin plate in advance so as to cover the adhered portion, and various organic and inorganic paints are employed. Separately, outer frame 840mm as a frame assuming a fixed window frame of a car
A steel frame of × 440 mm, inner side 740 mm × 340 mm (board width 50 mm) and thickness 3 mm was prepared.

Next, a flexible adhesive is disposed at the corners of a1 to a4 in FIG. 2 to form a superposed portion of resin plates a1 to a4 and a superposed portion of a steel frame (not shown). In each case, after applying Tosprim D (trade name, manufactured by Toshiba Silicone Co., Ltd.) as a primer, and applying Tosseal 380, brand name, a silicone rubber-based adhesive manufactured by Toshiba Silicone Co., Ltd. GC-20 and GS-81 (trade name, manufactured by Yokohama Rubber Co., Ltd.) were applied as a primer to the overlapping portion of the plate, and RC-2 (trade name, manufactured by Yokohama Rubber Co., Ltd.) was applied as a primer to the overlapping portion of the steel frame. Then, a one-part urethane adhesive (trade name: WS-55, manufactured by Yokohama Rubber Co., Ltd.) was applied and bonded.

A thick steel plate as a load substrate was placed on the plate, pressed for about one day and night, and allowed to stand at room temperature for 6 days to complete a sample. In this example, the area of application of the highly flexible adhesive is about 30% of the total adhesive application area. The illustration of the black coating film is omitted.

2) Heat cycle test The sample was set in a hot air dryer, and the temperature was raised from room temperature to 105 ° C.
Immediately after (3.5 hours), a heat cycle test was performed for 10 cycles, with one cycle of cooling from 105 ° C. to room temperature (3.5 hours).

After the test, the hard coat layer was visually observed for cracks. Further, a reflection image of the zebra board was projected on the sample surface by a known zebra board method, and the degree of reflection distortion was evaluated based on the degree of distortion of the lattice pattern of the board. This method prepares limit samples of various levels in advance,
The degree of distortion is evaluated by comparison with it. Level 5 = distortion equal to ordinary glass ~ level 1 as a limit sample in advance
= Prepare five levels of remarkable stripe distortion and judge which one of the sample distortion matches. Table 1 shows the results
Shown in

3) Heating load test A steel frame was fixed in the state shown in FIG. 1, a 30 kg weight was placed on a resin plate, and kept at 50 ° C. for 24 hours in a constant temperature bath. A heating load test for observing a fixed state and creep property was performed. The results are shown in Table 1.

[Embodiment 2] In FIG. 3, the same flexible adhesive as in Embodiment 1 is applied at a'1 to a'4, and the applied area is about 20% of the total adhesive applied area. did. The same test was performed after performing the bonding treatment in the same manner as in Example 1.

[Embodiment 3] In FIG. 4, the portions of the flexible adhesive similar to those in the embodiment 1 are a "1 to a" 4, and the applied area is about 20% of the entire adhesive applied area. did. The same test was performed after performing the bonding treatment in the same manner as in Example 1.

[Embodiment 4] In FIG. 2, the same flexible parts as those of the embodiment 1 are applied with adhesives b1 to b4 in addition to a1 to a4.
Thus, the application area was set to about 40% of the entire adhesive application area. The same test was performed after performing the bonding treatment in the same manner as in Example 1.

[Embodiment 5] In FIG. 3, the same flexible adhesive as in Embodiment 1 is applied to b'1 in addition to a'1 to a'4.
Bb′4, the applied area was about 50% of the entire adhesive applied area. The same test was performed after performing the bonding treatment in the same manner as in Example 1.

[Embodiment 6] In FIG. 4, as in the case of the first embodiment, the portion coated with the highly flexible adhesive is b "1 in addition to a" 1 to a "4.
~ B "4, the application area was set to about 50% of the entire adhesive application area. The same test was carried out after performing the same adhesive treatment as in Example 1. In addition to Example 1, Example 2 Tables 1 to 6 also show the results.

REFERENCE EXAMPLE 1 In FIG. 2, the same flexible adhesive portions as those in Example 1 were applied at a1 to a4, and the applied area was about 15% of the entire adhesive applied area. The same test was performed after performing the bonding treatment in the same manner as in Example 1.

REFERENCE EXAMPLE 2 In FIG. 3, the same flexible adhesive as in Example 1 is applied at b'1 to b'4, and the applied area is about 20% of the total adhesive applied area. did. The same test was performed after performing the bonding treatment in the same manner as in Example 1. The results of Reference Examples 1 and 2 are also shown in Table 1.

COMPARATIVE EXAMPLE 1 The same test as in Example 1 was performed after applying an adhesive having a high tensile strength as in Example 1 to the entire bonding area.

[Comparative Example 2] The same test as in Example 1 was carried out after applying the same highly flexible adhesive as in Example 1 to the entire adhesive area. The results of Comparative Examples 1 and 2 are also shown in Table 1.

[0034]

[Table 1]

As is clear from Table 1, the results are extremely good in the examples and generally good in the reference examples, but it is clear that they cannot be put to practical use together with those shown in the comparative examples.

[0036]

According to the present invention, it is possible to improve the adhesion between resin sheets having different coefficients of thermal expansion and materials to be bonded, and to suppress the occurrence of distortion and cracks.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a relation between a resin plate and a steel frame in the present invention.

FIG. 2 is a plan view showing an example in which each adhesive layer is arranged on a resin plate (a steel frame is not shown).

FIG. 3 is a plan view showing another embodiment in which each adhesive layer is arranged on a resin plate.

FIG. 4 is a plan view showing still another embodiment in which each adhesive layer is arranged on a resin plate.

[Explanation of symbols]

 1-Resin plate 2-Steel frame 3-Laminated portion of resin plate and steel frame a1 to a4, a'1 to a'4, a "1 to a" 4-Adhesive with high flexibility Agents b1 to b4, b'1 to b'4, b "1 to b" 4-flexible adhesive

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI // B29L 7:00 (56) References JP-A-3-51817 (JP, A) JP-A-3-17170 (JP, A) JP-A-63-61071 (JP, A) JP-A-53-24007 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08J 5/12 C09J 5/00

Claims (4)

(57) [Claims] When a resin plate and a dissimilar material having a different coefficient of thermal expansion are bonded to each other with an adhesive over the entire area of the overlapped portion or a desired portion, an elongation at break of 400% to 1500% and a tensile strength of
There the adhesive highly flexible is ^{10kg / cm 2 ~30kg / cm 2} , broken
Sectional elongation of 200% to 500%, a tensile strength of 40kg / cm ² ~80kg / c
placing an adhesive-rich tensile strength is m ² alternately, a method of bonding a resin plate, characterized in that the adhesive. 2. A resin plate and a metal frame for supporting the resin plate,
When the resin plate and the metal frame are bonded together with the adhesive over the overlapping part, the elongation at break is 400% to 1500% and the tensile strength is 10%.
and adhesive highly flexible is ^{kg / cm 2 ~30kg / cm 2} , breaking elongation
Beauty rate 200% to 500%, a tensile strength of at 40kg / cm ² ~80kg / cm ²
A method of bonding resin plates, comprising alternately arranging and bonding adhesives having a certain tensile strength. Wherein 20 to 50% adhesion area, the bonding method according to claim 1 or 2, wherein the resin plate and said placing the adhesive-rich flexibility. 4. The method of bonding a resin plate according to claim 1 , wherein an adhesive having high flexibility is provided at least at a corner portion of the resin plate.