JPH0673198A - Bonding of resin plate - Google Patents

Abstract

PURPOSE:To excellently bond a hard-coated resin glass for an automobile to a metal frame without generation of strain or crack by alternately putting an adhesive excellent in flexibility and another adhesive excellent in tensile strength on an adherend part and bonding them. CONSTITUTION:When putting a resin plate (preferably a hard coated polycarbonate or acrylate resin plate) on a different kind of a material having a different thermal expansion coefficient and bonding them, the bonding is carried out by alternately putting (A) an adhesive excellent in flexibility and (B) another adhesive excellent in tensile strength. A silicone rubber-based adhesive exhibiting 400 to 1500% breaking elongation and 10 to 30kg/cm<2> tensile strength is preferably used as the adhesive (A) and a one pot type urethane-based adhesive exhibiting 200 to 500% breaking elongation and 40 to 80kg/cm<2> tensile strength is preferably used as the adhesive (B). In addition, the adhesive (A) is recommendably used for a corner part of the resin plate and the ratio of the used adhesive (A) is preferably for 20 to 50% of the whole adherend area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adhering a resin plate to another material having a different coefficient of thermal expansion, preferably a resin glass plate and a metal frame used as a substitute for inorganic glass in an automobile. The present invention relates to an adhesion method, particularly an adhesion method between a hard coat-treated resin glass plate and a metal frame.

[0002]

2. Description of the Related Art Generally, when mounting an inorganic glass for automobiles on a window frame, for example, a peripheral edge of the inorganic glass is directly bonded to the window frame by using a urethane adhesive having excellent adhesive strength.

Instead of the above-mentioned inorganic glass, organic materials such as polycarbonate, acrylic, etc., or organic glass obtained by subjecting these to a hard coat treatment for imparting abrasion resistance, etc. are also used. Has a linear expansion coefficient of 7 compared to inorganic glass and metal frames, such as steel frames.
On the other hand, urethane adhesives generally have high adhesive strength, but lack flexibility, so that they cannot absorb the difference in expansion and contraction due to heating and cooling, causing distortion in the hard coat layer or the organic glass, As a result, cracks may occur in the hard coat layer.

In the present invention, including these, when a resin plate and different materials having different thermal expansion coefficients are bonded by an adhesive,
The present invention provides a method for adhering a resin plate that solves the above problems.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides a highly flexible adhesive when a resin plate and a different material having a different thermal expansion coefficient are bonded to each other over the entire overlapping portion or a desired portion with an adhesive. , And adhesives rich in tensile strength are alternately arranged,
Further, when the resin plate and the metal frame on which the resin plate is to be carried are adhered by an adhesive over the overlapping portion of the resin plate and the metal frame, the adhesive having high flexibility and the tensile strength The adhesive having a high degree of elasticity is alternately arranged and bonded, and the breaking elongation of the adhesive having a high flexibility is 400% to 1500% and the tensile strength is
10kg / cm ^{2 to} 30kg / cm ² , adhesive with high tensile strength, elongation at break of 200% to 500%, tensile strength of 40kg / cm ^{2 to} 80kg / cm ² Approximately 50% of the flexible adhesive is placed, preferably the flexible adhesive is a silicone rubber adhesive, and the tensile strength adhesive is a one-component urethane adhesive And the resin plate is a hard-coated polycarbonate-based or acrylic-based resin plate, and in addition, a flexible adhesive is provided at least at the corners of the resin plate.

INDUSTRIAL APPLICABILITY The present invention is applied to adhesion between a resin plate and a different material having a different thermal expansion coefficient. For example, adhesion between a resin plate and an inorganic glass, adhesion between an inorganic glass with a functional film, or metal. It can be used in a wide variety of applications such as adhesion to plates, especially when the hard-coated polycarbonate or acrylic resin plate is used as a substitute for inorganic glass for automobiles, and its peripheral portion is adhered to a metal frame, for example, a steel frame. It can be preferably used. At that time, when the method of bonding the entire peripheral region with the urethane-based adhesive that is widely used for bonding the inorganic glass for automobiles is adopted as it is, the adhesive lacks flexibility and has a high adhesive strength.
Alternatively, the resin plate may be distorted and the hard coat layer may be cracked.

For example, when a car is exposed to solar radiation in summer even in a warm zone, the temperature of the resin plate reaches 70 to 90 ° C, or reaches -20 to -40 ° C in a cold district in winter, and a remarkable temperature difference from room temperature. In many cases, the above-mentioned adverse effect is likely to occur.

The present invention has the function of suppressing the occurrence of strain and cracks by the buffering action of the adhesive layer having high flexibility, while maintaining the adhesive force with the adhesive layer having high adhesive strength.

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

The arrangement of the adhesive is basically based on the central portion of each side of the resin plate, and is separated from the central portion, and the portion having the largest difference in expansion and contraction, that is, the corner portion, has a flexible adhesive layer. It is preferable to adopt it. Although cracks in the hard coat layer in the conventional corners are not a few, they can be greatly reduced by taking the above measures.

Since an adhesive having high flexibility does not have a large adhesive strength by itself, it is not preferable to take the adhesive area excessively, and the adhesive area should be 50% or less of the total adhesive area. Also, the lower limit depends on the size of the resin plate, but it is 20 including the corners.
% Or more, and if it is less than 50%, the effect of suppressing the strain and crack is not remarkable.

[0012]

EXAMPLES The adhesion between the resin plate and the steel frame will be described in detail below as a specific example of the present invention, but the present invention is not limited to this.

FIG. 1 is a side sectional view showing the relationship between a resin plate (polycarbonate plate as an example) and a steel frame according to the present invention. 1 is a resin plate, 2 is a steel frame, and 3 is a resin plate. The overlapping portion, that is, the adhesive portion, of the steel frame is shown.

2 to 4 are plan views showing an example in which each adhesive layer is arranged on a resin plate (steel frame is not shown). 1 is a resin plate, 3 is a resin plate and a steel frame. An overlapping portion, that is, an adhesive portion is shown.

Each of a1 to a4, a'1 to a'4, and a "1 to a" 4 indicates the arrangement of the flexible adhesive at the corners of the resin plate, and the other bonded portions are stretched. An adhesive with high strength is arranged. Alternatively, in addition to the above, consider the size of the resin plate and other factors, and use a flexible adhesive b1-b
One or a plurality of b'1 to b'4, b "1 to b" 4, etc. may be arranged at appropriate positions on each side.

As a flexible adhesive, the elongation at break is
Adopt one with a tensile strength of 400 to 1500% and a tensile strength of 10 to 30 kg / cm ² . As an adhesive having such a property, a silicone adhesive such as Tosseal 380 manufactured by Toshiba Silicone Co., Ltd. is generally suitable.

As the adhesive having a high adhesive strength, an adhesive having a breaking elongation of 200 to 500% and a tensile strength of 40 to 80 kg / cm ² is adopted. As an adhesive having such properties,
One-component urethane adhesives such as the product name WS-55 manufactured by Yokohama Rubber Co., Ltd., the product name SR Seal U80 manufactured by Sunrise Meisei Co., Ltd., and the product name Solid Seal 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 surfaces were coated with acrylic primer liquid, Toshiba Silicone Co., Ltd., trade name PH91, by nozzle flow coating. Method, and then apply a silicone-based coating solution for the hard coat layer, Toshiba Silicone Co., Ltd., trade name Tosgard 510, and dry to a size of 800 mm.
A resin plate with a quadrilateral size of 400 mm and a thickness of 5 mm was prepared.

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

Next, in the form of arranging a highly flexible adhesive at the corners of a1 to a4 in FIG. 2, the superposed portions of the resin plates a1 to a4 and the superposed portion of the steel frame (not shown) ) Are coated with Toshiba Silicone Co., Ltd., trade name Tosprime D, as a primer, and then Toshiba Silicone Co., Ltd., silicone rubber adhesive, trade name Tosseal 380 is applied, and the resin in the parts other than a1 to a4 Yokohama Rubber Co., Ltd. product name GC-20 and GS-81 were applied as a primer to the overlapping parts of the plate, and Yokohama Rubber Co., Ltd. product name RC-2 was applied as a primer to the steel frame overlapping part. Then, a one-component urethane adhesive product name WS-55 manufactured by Yokohama Rubber Co., Ltd. was applied and adhered.

A thick steel plate as a load base material was placed on this, pressure-bonded for about 1 day and night, and then left at room temperature for 6 days to complete a sample. In this example, the flexible adhesive coating area is about 30% of the total adhesive coating area. The black coating film is not shown.

2) Heat cycle test Set the sample in the hot air dryer and raise the temperature from room temperature to 105 ° C.
Immediately after (3.5 hours), a temperature cycle from 105 ° C to room temperature (3.5 hours) was set as one cycle, and a 10-cycle thermal cycle test was performed.

After the test, the presence or absence of cracks in the hard coat layer was visually observed. Furthermore, a reflection image of the zebra board was projected on the surface of the sample by a known zebra board method, and the degree of the reflection distortion was evaluated based on the degree of distortion of the checkerboard pattern on the board. This method prepares limit samples of various levels in advance,
The degree of strain is evaluated by comparison with that, and level 5 is used as a limit sample beforehand.
= Prepare five levels of stripe pattern distortion, and judge which one matches the sample distortion. The results are shown in Table 1.
Shown in.

3) Heating load test A steel frame was fixed in the state shown in FIG. 1, a weight of 30 kg was placed on the resin plate, and it was kept at 50 ° C. in a thermostat for one day and then taken out. A heating load test for observing the adhered state and the creep property was carried out. The results are also shown in Table 1.

[Embodiment 2] In FIG. 3, the adhesive application portions having the same flexibility as in Embodiment 1 are a'1 to a'4, and the application area is about 20% of the total adhesive application area. did. After the same adhesion treatment as in Example 1, the same test was performed.

[Embodiment 3] In FIG. 4, the adhesive application portion having the same flexibility as in Embodiment 1 is a "1 to a" 4, and its application area is about 20% of the total adhesive application area. did. After the same adhesion treatment as in Example 1, the same test was performed.

[Embodiment 4] As shown in FIG. 2, in addition to a1 to a4, a flexible adhesive-coated portion similar to that of Embodiment 1 is added to b1 to b4.
The coating area was set to about 40% of the total adhesive coating area. After the same adhesion treatment as in Example 1, the same test was performed.

[Embodiment 5] As shown in FIG. 3, a flexible adhesive-coated portion similar to that of Embodiment 1 includes b'1 in addition to a'1 to a'4.
~ B'4, the coating area was about 50% of the total adhesive coating area. After the same adhesion treatment as in Example 1, the same test was performed.

[Embodiment 6] As shown in FIG. 4, a portion having a flexible adhesive similar to that of Embodiment 1 is applied with b "1 in addition to a" 1 to a "4.
.About.b "4, the coating area was set to about 50% of the entire adhesive coating area. Similar bonding treatment was carried out in the same manner as in Example 1 and the same test was carried out. In addition to Example 1, Example 2 The results of ~ 6 are also shown in Table 1.

[Reference Example 1] In FIG. 2, the flexible adhesive coating portions similar to those in Example 1 were a1 to a4, and the coating area was about 15% of the total adhesive coating area. After the same adhesion treatment as in Example 1, the same test was performed.

[Reference Example 2] In FIG. 3, the adhesive application portion having the same flexibility as in Example 1 was b'1 to b'4, and the application area was about 20% of the total adhesive application area. did. After the same adhesion treatment as in Example 1, the same test was performed. 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 carried out after the adhesive having the same tensile strength as in Example 1 was applied to the entire bonding area.

[Comparative Example 2] The same flexible adhesive as in Example 1 was applied to the entire bonding area, and the same test as in Example 1 was carried out. 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 Examples and almost good in Reference Examples, but it is clear that they cannot be put to practical use together with those shown in Comparative Examples.

[0036]

According to the present invention, the resin plate having a different thermal expansion coefficient and the dissimilar material to be adhered are adhered well, and the generation of strain and crack is suppressed.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a relationship between a resin plate and a steel frame according to 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 mode in which each adhesive layer is arranged on a resin plate.

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

[Explanation of symbols]

 1 --Resin plate 2 --Steel frame 3 --Overlapping part of resin plate and steel frame a1 to a4, a'1 to a'4, a "1 to a" 4 --Flexible bonding Agents b1 to b4, b'1 to b'4, b "1 to b" 4 --Flexible adhesive

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Claims (7)

[Claims] 1. A resin plate and a different material having a different coefficient of thermal expansion are bonded to each other over the entire overlapping portion or a desired portion by an adhesive, and the adhesive has a high tensile strength. A method for adhering a resin plate, which comprises alternately arranging and adhering an agent. 2. A resin plate and a metal frame for supporting the resin plate,
When the resin plate and the metal frame are bonded to each other by the adhesive, the flexible adhesive and the adhesive having a high tensile strength are alternately arranged and bonded. Bonding method. 3. A flexible adhesive having an elongation at break of 400% to 400%.
1500%, Tensile strength 10kg / cm ² ~ 30kg / cm ² , Adhesive rich in tensile strength Elongation at break 200% ~ 500%, Tensile strength 40kg
3. The method for adhering a resin plate according to claim 1 or 2, wherein the resin plate has a thickness of / cm ^{2 to} 80 kg / cm ² . 4. The method for adhering a resin plate according to claim 1, wherein an adhesive agent having high flexibility is provided in 20 to 50% of the adhering area. 5. The resin plate according to claim 1, wherein the adhesive having high flexibility is a silicone rubber adhesive and the adhesive having high tensile strength is a one-component urethane adhesive. Bonding method. 6. The method for adhering a resin plate according to claim 1, wherein the resin plate is a hard-coated polycarbonate-based or acrylic-based resin plate. 7. A flexible adhesive is provided at least at the corners of the resin plate.
7. A method for adhering a resin plate according to any one of 6 to 6.