JPH11336819A - Forming method of complex laminated body and complex laminated body obtained thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming method of comprex laminated body and a complex laminated body obtained thereby in which the interfacial peeling of a hard quality plate and a rubber sheet is hardly generated even though a shearing force is received in any direction, so as to obtain an excellent peeling strength. SOLUTION: This is a manufacturing method of a complex laminated body made by laminating plural hard quality plates and rubber sheets alternately, and it has a process to punch a rolled unvulcanized rubber sheet by a specific die; a process to divide the punched unvulcanized rubber sheet into plural pieces, to provide the respective divided pieces by combining to make lines going from the U-shape closing hole direction of the U-shape oritation formed by the rolling process in the unvulcanized rubber sheet forming time to the opening hole direction, in different directions each other, and to laminate with the hard quality plates each other; and a process to harden the rubber sheet by vulcanizing the laminated body of the above rubber sheets and the hard quality plates, so as to form a complex laminated body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite laminate in which hard plates and rubber sheets used for a seismic isolation device or the like are alternately laminated, and a composite laminate obtained by the production method. The present invention relates to a composite laminate having excellent peel strength against force and a method for producing the same.

[0002]

2. Description of the Related Art A composite laminate formed by alternately laminating hard plates and soft plates is widely used for, for example, relaxation of shear stress applied to a building due to an earthquake or the like and seismic isolation rubber for mechanical devices. . Generally, a metal plate is used as a hard plate, and a rubber sheet is used as a soft plate.

Conventionally, this rubber sheet is formed by punching an unvulcanized rubber sheet rolled and molded into a sheet shape into a desired shape of a composite laminate such as a disc shape or a square shape, and simply laminated alternately with a metal plate. , Vulcanized to produce products.

It is well known that when unvulcanized rubber is rolled, that is, when it is formed into a thin plate with a controlled thickness by a known method, orientation occurs in the rolling direction and directionality occurs after vulcanization. Therefore, when molding a rubber product, the rubber product is molded in consideration of the influence of physical properties due to the rolling direction.

[0005] The rubber sheet used for the composite laminate is also formed by rolling unvulcanized rubber into a sheet. In this case as well, an orientation grain is formed in the thickness direction inside the sheet. In the case of such a thin sheet-shaped molded body, the orientation direction has hardly been considered in the past.

The inventors of the present invention have proposed a direction in which a shear stress is applied as in a composite laminate used for a building seismic isolation structure, that is,
It has been found that, for a product whose deformation direction is not constant, when a rolled rubber sheet is punched and laminated, a direction in which the adhesive force is weak always occurs.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a liquid crystal display device in which a shear force is applied from any direction.
It is an object of the present invention to provide a method for producing a composite laminate having excellent peel strength, in which interface peeling between a hard plate and a rubber sheet hardly occurs.

[0008]

Means for Solving the Problems In view of the above-mentioned objects, the present inventors have studied in detail the relationship between the orientation direction by rubber rolling and the peel strength. As a result, a U-shaped orientation in a specific direction is formed in the thickness direction, depending on the rolling method, inside the rolled rubber sheet. On the other hand, when peeled in a direction different from this line and parallel to the line from the U-shaped closing direction to the opening direction of the U-shaped orientation, good rubber breakage occurs and strong adhesion is exhibited. On the other hand, when peeling in parallel and in the same direction as this line, peeling occurs at a portion close to the interface, and it is clear that peel strength is greatly reduced. By controlling the direction of this alignment direction, excellent peel strength is obtained. The inventors have found that a composite laminate can be obtained, and have completed the present invention.

That is, the method for forming a composite laminate of the present invention comprises:
A method for producing a composite laminate in which a plurality of hard plates and rubber sheets are alternately laminated, wherein the unvulcanized rubber sheet is rolled into a sheet. The step of punching with a predetermined mold and the punched rubber sheet, the line from the U-shaped closing direction of the U-shaped orientation formed by the rolling process at the time of molding the unvulcanized rubber sheet to the opening direction is the composite laminate. The step of disposing differently from the shear direction, the step of alternately laminating with a hard plate, the step of vulcanizing a laminate of the rubber sheet and the hard plate to cure the rubber sheet, and forming a composite laminate, It is characterized by having.

[0010] The method for forming a composite laminate according to the present invention according to claim 2 is a method for producing a composite laminate in which hard plates and rubber sheets are alternately laminated. Punching the unvulcanized rubber sheet with a predetermined mold,
The punched rubber sheet is divided into a plurality of pieces, and each of the divided pieces is formed by rolling at the time of molding an unvulcanized rubber sheet. Arranged in combination so as to be, a step of alternately laminating with the hard plate, and a step of vulcanizing the laminate of the rubber sheet and the hard plate to cure the rubber sheet, and forming a composite laminate, It is characterized by having.

Although the mechanism of action of the present invention is not clear, the change in peel strength depending on the orientation direction of the rolled rubber sheet is as follows in the line from the U-shaped closing direction to the opening direction.
While the destruction proceeds along the portion close to the interface and makes it easy to peel off, it does not match the above direction, if it has some angle, or conversely from the U-shaped opening direction of the U-shaped orientation In the line toward the closing direction, destruction tends to be promoted in the direction away from the interface, and peeling along the orientation is unlikely to occur.Thus, by controlling these directions according to the direction of the shearing force, strong It is considered that peel strength is developed.

In the present invention, the term "rolling" refers to a step of thinning an unvulcanized rubber sheet using a rolling roller, an extrusion die or the like.

[0013]

FIG. 1 is a schematic sectional view showing the structure of a composite laminate manufactured by the manufacturing method of the present invention.

The composite laminate 10 is formed by alternately laminating a rubber sheet 12 as a hard plate and a soft plate 14 and bonding them.

Here, the rubber sheet 12 used as a soft plate is rolled in the state of unvulcanized rubber, formed into a sheet shape, punched out with a predetermined mold, and alternately with a hard plate such as a metal plate. The composite sheet is laminated, and the rubber sheet is vulcanized and cured, and is brought into close contact with the hard plate to produce a composite laminate.

When the unvulcanized rubber is rolled and processed into a sheet, the inside of the rolled rubber sheet depends on the rolling method,
As shown in the schematic diagram of FIG. 2, an orientation occurs in the thickness direction as defined in the present invention as a U-shaped orientation. FIG. 2 (A) shows a case where rolling is performed by a pair of opposing rolls. In this case, the U-shaped orientation is formed such that the line from the U-shaped closing direction to the opening direction matches the rolling direction. Is done. On the other hand, FIG. 2 (B) shows a case where rolling is performed by an extrusion die, and a line in which the U-shape is oriented from the U-shaped closing direction to the opening direction is formed in a direction opposite to the rolling direction. From these examples, it can be seen that U-shaped orientations in the opposite directions caused by the rolling methods have occurred. As described above, when the sheet is peeled along the line from the U-shaped closing direction to the opening direction with respect to the U-shaped orientation in the thickness direction in a sheet shape, peeling occurs at a portion close to the interface, and the peeling strength is reduced. On the other hand, when the rubber material is greatly reduced, if it is peeled off in a direction different from that direction, for example, along a line from the U-shaped opening direction to the closing direction, good rubber breakage is exhibited and a strong adhesive force is exhibited.

Accordingly, when the composite laminate is placed at a position where shear stress is applied from a predetermined direction, the shear direction and the U-shaped orientation are determined by the line of the line from the U-shaped closing direction to the opening direction. The rubber sheet may be arranged on the hard plate so that the directions do not match.For example, the line may be arranged so as to have an angle different preferably by 10 degrees or more with respect to the shearing direction. It is preferable to arrange a rubber sheet on a hard plate so that the line in the orientation direction is vertical. The hard plate and the rubber sheet may be alternately laminated in this manner, and the formed laminate may be cured.
FIG. 3 shows the direction of the shear stress applied to the composite laminate.
It is the schematic which shows the state which arrange | positioned the rubber sheet 12 on the hard plate which is not illustrated so that the U-shaped orientation direction by rolling may become perpendicular. If the direction of the line from the U-shaped closing direction to the opening direction is perpendicular to the shearing direction, the U-shape of the orientation direction described in the rubber sheet 12 is reversed as shown by the broken line in the figure. It may be arranged in the direction.

In general, a composite laminated body constituting a seismic isolation structure or the like is required to exhibit a strong peel strength even when a shearing force is applied in any direction from any direction. Is done.

When producing such a composite laminate,
This will be described by taking a cylindrical laminated rubber as an example. FIG. 4 (A)-
(C) is a diagram in which the rubber sheet 12 is divided into a plurality of parts, and the divided pieces are combined so that the U-shaped orientation directions formed by rolling during molding of the unvulcanized rubber sheet are different from each other. It is the schematic which shows the state arrange | positioned on the hard board which is not performed. The number of divided pieces is arbitrary, but from the viewpoint of operability at the time of division and lamination, about 2 to 4 divisions are preferable.

Further, for the composite laminate subjected to the shearing stress from the determined direction, more effective peeling can be achieved by arranging the rubber sheets divided in the same manner and combining the orientation directions in different directions. Strength can be achieved. FIGS. 5A and 5B are schematic diagrams showing a state in which the divided rubber sheets are arranged in a composite laminate subjected to shear stress from a fixed direction. In this way, the rubber sheet can be used for two shear forces from a certain direction.
It is effective to control the peeling resistance according to the U-shaped orientation direction formed by stamping into four or four parts and rolling at the time of molding the rubber sheet.

As described above, by controlling the orientation direction formed by rolling the rubber sheet, the breakage performance of the product is greatly improved, and the advantage that the spring precision is also improved by always keeping the molding direction constant. Show.

Even if the unvulcanized rubber sheet is divided and arranged, the cut pieces adhere to each other and are cured by passing through a vulcanization curing step after forming the laminate, so that the rubber sheet is cut. No decrease in the strength of the rubber sheet after vulcanization due to this is observed.

Hereinafter, members which can be used in the method for producing a composite laminate of the present invention will be briefly described.

Examples of the material used for the soft plate of the composite laminate according to the present invention include thermoplastic rubber, urethane rubber, natural rubber, finely crosslinked rubber, and the like. These unvulcanized rubber materials are rolled into a sheet. What is necessary is just to use what was shape | molded as a raw material. The material may be used alone or in combination of two or more.

The shape of the rubber sheet is not particularly limited, and is appropriately selected according to the required characteristics of the composite laminate.
The cross-sectional shape is generally circular, elliptical, square, or rectangular.

As the hard plate according to the present invention, various materials having required rigidity such as metal, ceramics, plastics, FRP, polyurethane, wood, paper board, slate board, decorative board and the like can be used. Here, the desired rigidity greatly varies depending on design conditions, but means rigidity that does not easily cause a buckling phenomenon when subjected to shear deformation.

The thickness and shape of the hard plate are not particularly limited.
It can be selected depending on the material used and the desired performance,
Generally, a material having a thickness of about 0.5 to 5 mm is used. The shape is arbitrary as in the case of the laminated soft plate, but usually, the same shape as the soft plate used together is used.

The hard plate and the rubber sheet are alternately laminated in a plurality of stages. At this time, as described above, the rubber sheet is
It is important to arrange in consideration of the U-shaped orientation formed at the time of rolling. The hard plate and the rubber sheet thus laminated are vulcanized in a predetermined mold to produce a composite laminate.

When the composite laminate is used in a seismic isolation structure, various components such as a plastic body or a friction plate laminate for improving the seismic isolation performance of the composite laminate, or filling of hard particles are used. Means can also be applied, and in that case, the composite laminate may have a hollow portion.

[0030]

EXAMPLES The present invention will be described below in more detail with reference to specific examples, but the present invention is not limited to these examples.

Example 1 Laminated Rubber for Bridges A natural rubber G10 for bridges having the following composition was rolled to a thickness of 8 mm, and punched into 240 mm × 240 mm to form an unvulcanized rubber sheet.

[Blending of natural rubber G10 for bridge] Natural rubber 100 parts by weight Carbon black (HAF) 40 parts by weight Aroma oil 5 parts by weight Crosslinking agent (sulfur) 1.5 parts by weight Zinc white 5 parts by weight Antioxidant 3 parts by weight (Norak 6C: trade name, manufactured by Ouchi Shinko Chemical Industry Co., Ltd.) Vulcanization accelerator 2 parts by weight (Noxeller NS: trade name, manufactured by Ouchi Shinko Chemical Industry Co., Ltd.) Layers were prepared and alternately laminated with four layers of internal steel plates (thickness: 2.3 mm) as hard plates. At this time, as shown in FIG. 3, the composite laminate was arranged such that the U-shaped orientation direction formed by rolling the rubber sheet was perpendicular to the shear direction of the composite laminate.

This laminate was vulcanized at 135 ° C. for 2.5 hours to obtain a composite laminate.

Test conditions: A surface pressure of 50 kgf / cm ^{2 was applied} , and 70% and 150% shearing of the rubber thickness was performed at 0.2 Hz for 3 cycles.
A simple shear rupture test was performed in, and the shear elongation at rupture and rupture stress were measured and compared.

The results are shown in Table 1 below.

Example 2 An unvulcanized rubber sheet was molded in two parts, and the U-shaped orientations formed by rolling were opposite to each other, and the U-shaped closing direction was U-shaped. The composite laminate was obtained in the same manner as in Example 1 except that the lines extending from the opening to the opening direction were directed outward from the center, that is, as shown in FIG. The same evaluation was performed. The results are shown in Table 1 below. (Comparative Example 1) Same as Example 1 except that the unvulcanized rubber sheet was arranged such that the U-shaped orientation direction formed by rolling matched the shear direction as shown in FIG. 6 (A). To obtain a composite laminate, and the same evaluation as in Example 1 was performed.
The results are shown in Table 1 below. (Comparative Example 2) An unvulcanized rubber sheet was molded in two parts, and FIG.
As shown in (B), the U-shaped orientation directions formed by rolling are opposite to each other, and the lines from the U-shaped closing direction of the U-shaped orientation to the opening direction face each other inward. Except for the arrangement, a composite laminate was obtained in the same manner as in Example 1, and the same evaluation as in Example 1 was performed. The results are shown in Table 1 below.

[0037]

[Table 1] As shown in Table 1, it can be seen that the composite laminate obtained by the method of the present invention has significantly improved breaking performance as compared with the comparative example.

Example 3 Laminated Rubber for Buildings A natural rubber G10 for a bridge having the following composition was rolled to a thickness of 1.9 mm.
Then, it was punched out into a 225 mmφ circle divided into two parts to prepare an unvulcanized rubber sheet.

[Blending of natural rubber G10 for building] Natural rubber 100 parts by weight Carbon black (ISAF) 35 parts by weight Crosslinking agent (sulfur) 1.5 parts by weight Zinc white 5 parts by weight Antioxidant 5 parts by weight (Norak 6C: Brand name, Ouchi Shinko Chemical Co., Ltd.) Vulcanization accelerator 1.5 parts by weight (Noxeller NS: trade name, Ouchi Shinko Chemical Co., Ltd.) 20 layers of this unvulcanized rubber sheet are prepared. And each 2
Internal steel plate (thickness 1.6mm) which is a hard plate by dividing
Nine layers were alternately laminated. At this time, as shown in FIG. 4 (A), the U-shaped orientation formed by rolling was arranged such that the line from the U-shaped closing direction to the opening direction was directed outward from the center of the composite laminate.

This laminate was vulcanized at 135 ° C. for 2.5 hours to obtain a composite laminate.

Test conditions: 200 to rubber sheet thickness
After giving% shear deformation, simple tension, elongation at break, and stress were measured. The results are shown in Table 2 below. (Example 4) An unvulcanized rubber sheet was prepared as shown in FIG.
Punched into a 0 ° fan shape (3 division molding), and as shown in FIG. 4B, a line from the U-shaped closing direction to the opening direction of the U-shaped orientation formed by rolling in each cut piece. A composite laminate was obtained in the same manner as in Example 2, except that the composite laminate was arranged so as to face outward from the center of the composite laminate.
The same evaluation as in Example 2 was performed. The results are shown in Table 2 below. (Comparative Example 3) An unvulcanized rubber sheet was punched into a circular shape, and FIG.
The composite laminate was obtained in the same manner as in Example 2 except that the laminate was randomly arranged as shown in Table 2 and evaluated in the same manner as in Example 2. The results are shown in Table 2 below.

[0042]

[Table 2] As shown in Table 2, the composite laminate obtained by the method of the present invention has significantly improved pull-out performance as compared with Comparative Example 3 in which the orientation direction of the unvulcanized rubber was not controlled. Recognize.

[0043]

According to the method for producing a composite laminate of the present invention, even when a shear force is applied from any direction,
It is possible to obtain a composite laminate excellent in peel strength, in which interface peeling between the hard plate and the rubber sheet hardly occurs.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing one embodiment of a composite laminate produced by a production method of the present invention.

FIG. 2A is a schematic diagram showing an orientation direction generated inside a rolled rubber sheet when rolled by a pair of opposed rolls, and FIG. 2B is a rolled rubber when rolled by an extrusion die. It is a schematic diagram which shows the orientation direction generated inside the sheet.

FIG. 3 is a schematic diagram showing a state in which a rubber sheet is arranged so that an orientation direction by rolling is perpendicular to a direction of shear stress applied to a composite laminate.

FIG. 4A shows a case where a rubber sheet is divided into two parts.
(B) shows a state in which each of the divided pieces is divided and divided into three parts, and (C) is a state in which the divided pieces are combined and arranged so that the orientation directions by rolling at the time of molding the unvulcanized rubber sheet are different from each other. It is a schematic diagram.

FIG. 5 (A) shows a state in which a rubber sheet is divided into two parts and arranged in a direction perpendicular to the direction of shear stress and in different orientation directions, and FIG. 5 (B) is divided into four parts and directions different from each other. FIG.

6A is a schematic diagram illustrating a state of a rubber sheet of Comparative Example 1 in an orientation direction, and FIG. 6B is a schematic diagram illustrating a state of a rubber sheet of Comparative Example 2 in an orientation direction.

FIG. 7 is a schematic view showing a state of an orientation direction of a rubber sheet of Comparative Example 3.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Composite laminated body 12 Rubber sheet 14 Hard plate

Claims (4)

[Claims] 1. A method for producing a composite laminate in which a plurality of hard plates and rubber sheets are alternately laminated, wherein the composite laminate is arranged at a position where a shear force in a certain direction acts, and A step of punching the vulcanized rubber sheet with a predetermined mold, and a line from the U-shaped orientation to the opening direction of the U-shaped orientation formed by rolling the punched rubber sheet at the time of rolling at the time of molding the unvulcanized rubber sheet. Arranging the composite laminate differently from the shearing direction and alternately laminating with the hard plate; and vulcanizing the laminate of the rubber sheet and the hard plate to cure the rubber sheet, thereby forming the composite laminate. A method of molding a composite laminate, comprising: a molding step. 2. A method for producing a composite laminate comprising a plurality of hard plates and rubber sheets alternately laminated, wherein a step of punching an unvulcanized rubber sheet rolled into a sheet shape with a predetermined mold; The punched rubber sheet is divided into a plurality of pieces, and each of the divided pieces is formed by rolling at the time of molding an unvulcanized rubber sheet. And a step of vulcanizing a laminate of the rubber sheet and the hard plate to cure the rubber sheet and form a composite laminate, A method for molding a composite laminate, comprising: 3. An unvulcanized rubber rolled into a sheet, which is a composite laminate in which a plurality of hard plates and rubber sheets are alternately laminated and arranged at a position where a shear force in a certain direction acts. The sheet is punched out in a predetermined mold, and the rubber sheet thus punched out has a U-shaped orientation formed by rolling at the time of molding the unvulcanized rubber sheet. A composite laminate obtained by disposing differently from the shear direction, alternately laminating with a hard plate, and vulcanizing the composite laminate. 4. A composite laminate comprising a plurality of hard plates and rubber sheets alternately laminated, wherein an unvulcanized rubber sheet rolled into a sheet is punched out by a predetermined mold and then divided into a plurality of pieces. Then, the divided pieces are arranged in combination so that the lines extending from the U-shaped closing direction to the opening direction of the U-shaped orientation formed by rolling at the time of molding the unvulcanized rubber sheet are in different directions. A composite laminate obtained by alternately laminating with a hard plate and vulcanizing the laminate.