JP2022026113A - Manufacturing method of laminate - Google Patents

Abstract

To provide a manufacturing method of a laminate capable of bonding a plurality of members comprising different materials without causing warpage.SOLUTION: A manufacturing method of a laminate includes bonding a first member, a second member comprising different materials from the first member, and an adhesion layer arranged between the first member and the second member for bonding the first member and the second member. The method includes an arrangement step of laminating the first member, the adhesion layer, and the second member in this order, a bonding step, after the arrangement step, of heating the first member to a first temperature while heating the second member to a second temperature which is different from the first temperature. At least one of the first member and the second member is resin, a thermal expansion coefficient of the first member is higher than a thermal expansion coefficient of the second member, and the first temperature is lower than the second temperature.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for producing a laminate.

In clinical tests, food tests, environmental tests, etc., high-precision analysis of cells, trace amounts of proteins, nucleic acids, and other substances to be analyzed may be required. As one of the methods for analyzing a minute amount of an object to be analyzed, a method using a fluid handling device having a minute flow path or a minute chamber is known.

In such a fluid handling device, a flow path for flowing the object to be analyzed and a well or the like for accommodating the object to be analyzed may be formed separately. For example, in Patent Document 1, after molding a member constituting a flow path and a member constituting a well by injection molding or the like, a resin sheet is sandwiched between them and heated from both sides to be bonded. (For example, Patent Document 1).

JP-A-2015-199340

Here, in a fluid handling device or the like as described in Patent Document 1, a flow path, a well, or the like may be manufactured from a different resin material. However, it has been clarified that when members made of different resins are bonded to each other by the method described in Patent Document 1, the resulting fluid handling device (laminated body) is warped or peeled off.

The thermal expansion rate of each member is determined by the type of material constituting the member. That is, a plurality of members made of different materials have different thermal expansion rates from each other. Therefore, as described above, when bonding is performed by heating from both sides at the same temperature, the resin member having a high thermal expansion rate is bonded to the other member in a state where the volume is larger than room temperature. When the laminate is cooled to room temperature, the amount of shrinkage of each member is different, so that the other member is pulled toward the member having a large amount of shrinkage and warps, or a load is applied to the adhesive surface to cause peeling. In the fluid handling device, when such warpage or peeling occurs, problems such as leakage of the object to be analyzed to the outside or mixing of a plurality of objects to be analyzed occur.

The present invention has been made in view of the above problems. That is, a method for manufacturing a laminated body capable of bonding a plurality of members made of different materials without causing warpage is provided.

The present invention provides the following method for producing a laminate.
Adhesion arranged between the first member, the second member made of a material different from the first member, the first member and the second member, and adhering the first member and the second member. A method for manufacturing a laminate having a layer, wherein the first member, the adhesive layer, and the second member are overlapped in this order, and after the arrangement step, the first member is placed at a first temperature. The first member comprises a bonding step of heating the second member to a second temperature different from the first temperature while heating the first member, and at least one of the first member and the second member is a resin. A method for manufacturing a laminated body, wherein the thermal expansion rate of the member is higher than the thermal expansion rate of the second member, and the first temperature is lower than the second temperature.

According to the method for manufacturing a laminated body of the present invention, it is possible to bond a plurality of members made of different materials without causing warpage.

1A to 1C are schematic cross-sectional views for explaining a method for manufacturing a laminated body according to the first embodiment of the present invention. 2A to 2D are schematic cross-sectional views for explaining a method for manufacturing a laminated body according to a second embodiment of the present invention.

Hereinafter, the method for producing a laminated body of the present invention will be described in detail based on two specific embodiments. However, the method for producing the laminate of the present invention is not limited to the following embodiments.

1. 1. First Embodiment The manufacturing method of the laminated body in this embodiment is shown in FIGS. 1A to 1C. In the method for manufacturing a laminated body of the present embodiment, as shown in FIG. 1A, the first member 11, the adhesive layer 12, and the second member 13 are superposed in this order (arrangement step). Then, as shown in FIG. 1B, the heating members 21a and 21b are arranged outside the first member 11 and outside the second member 13, respectively. Then, while heating the first member 11 at the first temperature, the second member 13 is heated at a second temperature higher than the first temperature (adhesion step). As a result, the first member 11 and the second member 13 are respectively adhered to the adhesive layer 12, and as shown in FIG. 1C, the first member 11, the adhesive layer 12, and the second member 13 are laminated in this order. 100 is obtained.

The first member 11 and the second member 13 to be overlapped in the above arrangement step are made of different materials. The material constituting the first member 11 and the second member 13 may be a resin or an inorganic material such as glass or metal. However, at least one is a resin. Further, the thermal expansion rate of the first member 11 is higher than the thermal expansion rate 13 of the second member. When both members are made of resin and their thermal expansion rates are significantly different, the effect of the present invention can be easily obtained.

The resin constituting the first member 11 and the second member 13 is not particularly limited, and examples of the resin constituting the first member 11 and the second member 13 include polyesters such as polyethylene terephthalate; polycarbonate; polymethylmethacrylate and the like. Acrylic resin; Polyvinyl chloride; Polyethylene, polypropylene, cycloolefin polymer, polyolefin such as cycloolefin copolymer; polyether; polystyrene; silicone resin; polyamide; and various elastomers. The first member 11 and the second member 13 may contain only one kind thereof, or may contain two or more kinds thereof. Among them, the first member 11 is preferably a crystalline resin such as polypropylene or polyamide, and the second member 13 is preferably an amorphous resin such as cycloolefin polymer or polymethylmethacrylate.

Hereinafter, the case where the first member 11 contains polypropylene and the second member 13 contains a cycloolefin polymer will be described as an example, but the present invention is not limited to these combinations. For example, examples of preferred combinations include polypropylene and cycloolefin copolymers, polyamides and polymethylmethacrylates and the like.

Here, the shapes of the first member 11 and the second member 13 are not particularly limited, and are appropriately selected depending on the use of the laminated body. In the present embodiment, both the first member 11 and the second member 13 are flat plate-shaped members, but the shape is not limited to such a shape, and a three-dimensional structure may be used. Further, the first member 11 and the second member 13 may have grooves, uneven structures, through holes, and the like at arbitrary positions.

Further, the surface of the first member 11 facing the adhesive layer 12 and the surface of the second member 13 facing the adhesive layer 12 may be a flat surface or a curved surface, or may have a step or the like.

Further, the thickness of the first member 11 and the second member 13 is such that when heated by the heating members 21a and 21b in the bonding step described later, the interface between the first member 11 and the adhesive layer 12 and the thickness of the second member 13 are adhered to each other. It suffices as long as it has a thickness sufficient to transfer heat to the interface with the layer 12, and is appropriately selected depending on the use of the laminated body (functions of the first member 11 and the second member 13, etc.).

On the other hand, the adhesive layer 12 may be a layer that can be adhered to the first member 11 and the second member 13 by heating, and examples thereof include a sheet made of an elastomer having viscoelasticity. The adhesive layer 12 may or may not have adhesiveness at room temperature.

The elastomer constituting the adhesive layer 12 may be a thermoplastic elastomer or a thermosetting elastomer resin. Examples of thermosetting elastomers include polyurethane-based elastomers, polysilicone-based elastomers, and the like. Examples of thermoplastic elastomers include styrene-based elastomers, olefin-based elastomers, polyester-based elastomers, and the like. Specific examples of the olefin-based elastomer include a polypropylene-based elastomer, and examples thereof include ZELAS (registered trademark of Mitsubishi Chemical Corporation) manufactured by Mitsubishi Chemical Corporation. Examples of polyester-based elastomers include Perprene manufactured by Toyobo Co., Ltd. (registered trademark of the same company), Hytrel manufactured by Toray DuPont Co., Ltd. (registered trademark of the same company), and the like. The adhesive layer 12 may contain only one kind of these, or may contain two or more kinds of them.

The plan-view shape of the adhesive layer 12 is appropriately selected according to the shapes of the first member 11 and the second member 13, and may have through holes or the like according to the shapes of the first member 11 and the second member 13. ..

The thickness of the adhesive layer 12 is not particularly limited, but is preferably about 100 to 500 μm, more preferably about 200 to 400 μm, from the viewpoint of increasing the strength of the obtained laminated body. Further, the thickness of the laminated body may be uniform or may be partially different. It is appropriately selected according to the structure of the first member 11 and the second member 13.

In the arrangement step in the present embodiment, the above-mentioned first member 11, the adhesive layer 12, and the second member 13 are overlapped with each other. At this time, the first member 11 and the second member 13 may be fixed by a jig or the like, if necessary. The stacking order is not particularly limited, and the first member 11 and the adhesive layer 12 may be overlapped first, or the second member 13 and the adhesive layer 12 may be overlapped first.

Then, while heating the first member 11 to the first temperature, the bonding step of heating the second member 13 to a second temperature different from the first temperature is performed. In the present specification, heating the first member 11 to the first temperature means heating the temperature of at least a part of the first member 11 (in the present embodiment, the interface with the heating member 21a) to the first temperature. That is, the temperature of the entire first member 11 does not necessarily have to be the first temperature. Similarly, heating the second member 13 to the second temperature means that the temperature of at least a part of the second member 13 (in the present embodiment, the interface with the heating member 21b) is heated to the second temperature. However, the temperature of the entire second member 13 does not necessarily have to be the second temperature.

In the present embodiment, the heating members 21a and 21b are arranged on the outside of the first member 11 and the second member 13 (both are on the opposite side of the adhesive layer 12), and the first member 11 becomes the first temperature. As described above, the second member 13 is further heated so as to reach the second temperature.

Here, the temperature of the first member (first temperature) and the temperature of the second member (second temperature) in the bonding step are the easiness of shrinkage of the first member 11 and the second member 13, respectively (at the time of cooling). It is appropriately selected depending on the amount of shrinkage), the type of the adhesive layer 12, and the like. In the present embodiment, the first member 11 contains polypropylene which is a crystalline resin, and the second member 13 contains a cycloolefin polymer which is an amorphous resin. That is, the first member 11 contains a material having a higher thermal expansion rate and shrinking even at a relatively low temperature. Therefore, in the present embodiment, the first temperature is about 70 to 110 ° C., and the second temperature is about 110 to 160 ° C. (however, the first temperature <second temperature).

Here, it is conceivable that the first temperature and the second temperature are set to about 90 ° C. in accordance with the member having a high thermal expansion rate (here, the first member 11). However, in this case, although the obtained laminated body is unlikely to warp, the second member 13 is not sufficiently softened by heating, and the adhesive strength between the second member 13 and the adhesive layer 12 tends to be low. On the other hand, it is conceivable that the first temperature and the second temperature are both set to about 135 ° C. in accordance with the member having a low thermal expansion rate (here, the second member 13). However, in this case, although the adhesive strength between the second member 13 and the adhesive layer 12 is increased, the deformation (shrinkage) of the first member 11 is increased after the adhesion, and the obtained laminated body 100 is liable to warp.

When the first member 11 contains a crystalline resin as in the present embodiment, the first temperature can be determined based on the crystallization temperature Tc ₁ of the crystalline resin constituting the first member 11. preferable. Specifically, it is particularly preferable that the _{first temperature is (Tc 1-50) ° C. or higher and (Tc 1-10 )} ° C. or lower. For example, when the first member 11 contains polypropylene having a crystallization temperature of 120 ° C. as in the present embodiment, the first temperature is preferably 70 to 110 ° C. When the first temperature is in such a temperature range, when the temperature of the first member 11 is lowered from the first temperature to room temperature, the volume is very unlikely to change, and the obtained laminate 100 is unlikely to warp. However, if the first temperature is excessively low, the adhesive strength between the first member 11 and the adhesive layer 12 becomes low. Therefore, the lower limit of the first temperature is preferably a temperature 50 ° C. lower than the crystallization temperature Tc ₁ of the _first member 11, that is, (Tc 1-50) ° C.

On the other hand, when the second member 13 contains an amorphous resin, the second member 13 is unlikely to shrink due to heat. Therefore, in such a case, it is more preferable to determine the second temperature based on the melting point Tm ₂ of the adhesive layer 12. Specifically, it is particularly preferable that the second temperature is (Tm _2-50 ) ° C. or higher and Tm ₂ ° C. or lower. For example, when the adhesive layer 12 contains a polypropylene-based elastomer having a melting point of 160 ° C. as in the present embodiment, the second temperature is preferably 110 to 160 ° C. When the second temperature is in such a temperature range, the volume change is unlikely to occur when the second member 13 is lowered from the second temperature to room temperature. Further, by setting the temperature higher than the first temperature, the second member 13 and the adhesive layer 12 can be firmly adhered to each other.

The heating time of the first member 11 and the second member 13 is appropriately selected depending on the shape, thickness, etc. of the first member 11 and the second member 13, but is preferably about 10 seconds to 90 seconds, preferably 20 to 60 seconds. Seconds are more preferable. When the heating time is within the range, heat is sufficiently transferred to the interface between the first member 11 and the adhesive layer 12 and the interface between the second member 13 and the adhesive layer 12, and these can be sufficiently adhered. On the other hand, when the heating time is within the range, the laminated body 100 can be efficiently manufactured, and further, the first member 11 and the second member 13 can be prevented from being excessively softened and deformed.

The timing of starting heating of the first member 11 and the second member 13 may be the same or different. Similarly, the timings for ending the heating of the first member 11 and the second member 13 may be simultaneous or different.

Further, the first member 11, the adhesive layer 12, and the second member 13 may be pressed against each other, if necessary. The pressure at this time is appropriately selected according to the type of the first member 11, the material of the second member 13, and the like.

Here, the heating members 21a and 21b for heating the first member 11 and the second member 13 are not particularly limited, and are appropriately selected according to the shapes of the first member 11 and the second member 13. For example, a known press device or a known heating device can be used.

After the heating, the laminated body 100 in which the first member 11, the adhesive layer 12, and the second member 13 are laminated in this order is cooled, if necessary.

(Modification example)
In the above, the adhesive layer 12 for adhering the first member 11 and the second member 13 has been described as a self-supporting sheet. However, the adhesive layer 12 does not have to be self-supporting, and the adhesive layer 12 may be formed between the first member 11 and the second member 13 by, for example, applying an adhesive.

(effect)
In the above-mentioned first embodiment, the heating temperature (first temperature) of the first member 11 and the heating temperature of the second member 13 when the first member 11, the adhesive layer 12, and the second member 13 are adhered to each other. It is different from (second temperature). More specifically, the first member 11 having a large thermal expansion rate (shrinkage at the time of cooling) is heated at a relatively low temperature. On the other hand, the second member 13 having a low thermal expansion rate and being difficult to soften is heated at a relatively high temperature. Therefore, in any of the first member 11 and the second member 13, shrinkage is unlikely to occur after bonding, and the obtained laminated body 100 is unlikely to warp. Further, since the adhesive strength of the first member 11 and the adhesive layer 12 and the adhesive strength of the second member 13 and the adhesive layer 12 are improved, peeling and gaps are unlikely to occur between them, and a highly reliable laminated body is formed. 100 is obtained.

Therefore, the method for manufacturing a laminate of the embodiment can be applied to, for example, the manufacture of a fluid handling device and the manufacture of various industrial products.

2. 2. Second Embodiment The manufacturing method of the laminated body in this embodiment is shown in FIGS. 2A-2D. In the method for manufacturing a laminated body of the present embodiment, as shown in FIG. 2A, the first member 111 and the adhesive layer 112 are overlapped with each other, and these are heated and bonded (temporary bonding step). After that, as shown in FIG. 2B, the second member 113 is superposed on the adhesive layer 112 bonded to the first member 111 (arrangement step). Then, as shown in FIG. 2C, the heating members 21a and 21b are arranged outside the first member 111 and outside the second member 113, respectively, and the second member 113 is heated at the first temperature while heating the first member 111. Is heated at a second temperature higher than the first temperature (adhesion step). As a result, the first member 111 and the second member 113 are respectively bonded to the adhesive layer 112, and as shown in FIG. 2D, the first member 111, the adhesive layer 112, and the second member 113 are laminated in this order. 200 is obtained.

Also in this embodiment, the first member 111 and the second member 113 are made of different materials, and the thermal expansion rate of the first member 111 is higher than the thermal expansion rate of the second member 113. The material constituting the first member 111 and the second member 113 may be a resin or an inorganic material such as glass or metal. However, at least one is a resin. When both members are made of resin and their thermal expansion rates are significantly different, the effect of the present invention can be easily obtained. Here, the first member 111 and the second member 113 used in the method of the present embodiment are the same as the first member 11 and the second member 13 of the first embodiment described above. Further, the adhesive layer 112 is the same as the adhesive layer 12 of the first embodiment. Therefore, the description of these will be omitted. Hereinafter, the case where the first member 111 contains polypropylene and the second member 113 contains a cycloolefin polymer will be described as an example, but the present invention is not limited to these combinations.

In the present embodiment, first, a temporary bonding step of stacking the first member 111 and the adhesive layer 112 and heating and adhering them is performed. The heating temperature in the temporary bonding step is not particularly limited, and may be any temperature as long as the first member 111 and the adhesive layer 112 can be adhered to each other. The heating temperature in the temporary bonding step may be higher than the first temperature described later. The temperature may be set based on the melting point Tm ₂ of the adhesive layer 112. In particular, when the heating temperature in the temporary bonding step is set to the melting point (Tm _2-50 ) ° C. or higher and Tm ₂ ° C. or lower of the adhesive layer 112, the adhesive strength between the adhesive layer 112 and the first member 111 becomes high. For example, when the adhesive layer 112 contains a polypropylene-based elastomer having a melting point of 160 ° C., the heating temperature in the temporary bonding step is preferably 110 to 160 ° C.

The method for heating the first member 111 and the adhesive layer 112 in the temporary bonding step is not particularly limited. For example, a heating member (not shown) may be arranged on the first member 111 side to heat from the first member 111 side, or a heating member (not shown) may be arranged on the adhesive layer 112 side to arrange the adhesive layer 112. It may be heated from the side. Further, heating members (not shown) may be arranged on both sides to heat the surface. The type of the heating device that heats the first member 111 and the adhesive layer 112 is not particularly limited, and may be any of various ovens, press devices, and the like. Further, during the temporary bonding step, the surface of the adhesive layer 112 opposite to the first member 111 may be protected by a protective member or the like.

Further, the heating time in the temporary bonding step is not particularly limited. After the temporary bonding step, the first member 111 and the adhesive layer 112 may be appropriately adhered to each other, and the first member 111 and the adhesive layer 112 may be completely adhered to each other. There may be.

After the temporary bonding step, the laminate of the first member 111 and the adhesive layer 112 is cooled to about room temperature 1. At this time, it may be cooled by a cooling device or the like, or it may be air-cooled.

Subsequently, in the temporary bonding step, an arrangement step of arranging the second member 113 on the adhesive layer 112 bonded to the first member 111 is performed. As a result, the first member 111, the adhesive layer 112, and the second member 113 are arranged in this order.

Then, after the arranging step, the bonding step of heating the second member 113 to a second temperature different from the first temperature is performed while heating the first member 111 to the first temperature. In the present embodiment, the heating members 21a and 21b are arranged on the outside of the first member 111 and the second member 113 (both are on the opposite side of the adhesive layer 112), and the first member 111 and the second member 113 are arranged. Heat to different temperatures.

Also in this embodiment, the first member 111 contains polypropylene and the second member 113 contains a cycloolefin polymer. That is, the first member 111 contains a material that shrinks at a relatively low temperature. Therefore, in the present embodiment, the first temperature is set to about 70 to 110 ° C., and the second temperature is set to about 110 to 160 ° C. (however, the first temperature <second temperature).

Also in this embodiment, when the first member 111 contains a crystalline resin, it is more preferable to determine the first temperature based on the crystallization temperature Tc ₁ of the crystalline resin constituting the first member 111. .. Specifically, it is particularly preferable that the _{first temperature is (Tc 1-50) ° C. or higher and (Tc 1-10 )} ° C. or lower. For example, when the first member 111 contains polypropylene having a crystallization temperature of 120 ° C. as in the present embodiment, the first temperature is preferably 70 to 110 ° C. as described above. Within such a temperature range, the volume change at the time of cooling after raising the temperature of the first member 111 to the first temperature is small, and the warp can be reduced. In this embodiment, since the temporary bonding step has already been performed, the adhesive strength between the first member 111 and the adhesive layer 112 can be sufficiently increased even if the temperature is relatively low. At this time, the lower limit of the _first temperature is preferably (Tc 1-50) ° C.

On the other hand, when the second member 113 contains an amorphous resin, the second member 113 is unlikely to shrink due to heat. Therefore, it is more preferable to determine the second temperature based on the melting point Tm ₂ of the adhesive layer 112. Specifically, it is particularly preferable that the second temperature is (Tm _2-50 ) ° C. or higher and Tm ₂ ° C. or lower. For example, when the adhesive layer 112 contains a polypropylene-based elastomer having a melting point of 160 ° C., the second temperature is preferably 110 to 160 ° C. as described above. Within such a temperature range, the second member 113 is unlikely to shrink during cooling, and the adhesive strength between the second member 113 and the adhesive layer 112 is sufficiently increased.

The heating time of the first member 111 and the second member 113 is appropriately selected depending on the shape, thickness, etc. of the first member 111 and the second member 113, but is preferably 5 to 60 seconds, preferably 10 to 30 seconds. More preferred. When the heating time is within the range, heat is sufficiently transferred to the interface between the first member 111 and the adhesive layer 112 and the interface between the second member 113 and the adhesive layer 112, and these can be sufficiently adhered. On the other hand, when the heating time is within the range, the laminated body 200 can be efficiently manufactured, and the first member 111 and the second member 113 can be suppressed from being excessively softened and deformed.

The timing of starting heating of the first member 111 and the second member 113 may be the same or different. Similarly, the timings for ending the heating of the first member 111 and the second member 113 may be simultaneous or different.

Further, in the bonding step, the first member 111, the adhesive layer 112, and the second member 113 may be pressed against each other, if necessary. The pressure at this time is appropriately selected according to the type of the first member 111, the material of the second member 113, and the like.

The heating members 21a and 21b for heating the first member 111 and the second member 113 are not particularly limited, and are appropriately selected according to the shapes of the first member 111 and the second member 113. For example, a known press device, a known heating device, or the like can be used.

After the heating, the laminated body 200 in which the first member 111, the adhesive layer 112, and the second member 113 are laminated in this order is cooled, if necessary.

(Modification example)
In the above, the adhesive layer 112 for adhering the first member 111 and the second member 113 has been described as a self-supporting sheet. However, the adhesive layer 112 does not have to be self-supporting, and the adhesive layer 112 may be formed on the first member 111 by, for example, coating.

Further, in the above description, in the temporary bonding step, the first member 111 having a high thermal expansion rate and the bonding layer 112 are bonded first. However, in the temporary bonding step, the second member 113 having a low thermal expansion rate may be bonded to the bonding layer 112 first.

(effect)
In the second embodiment described above, the first member 111 and the adhesive layer 112 are first bonded by a temporary bonding step. The adhesive layer 112 is usually more flexible than the first member 111, and easily expands and contracts according to the shape of the first member 111. Therefore, even if the first member 111 expands or contracts in the temporary bonding step, the laminated body of the first member 111 and the adhesive layer 112 is less likely to bend. Therefore, the first member 111 and the adhesive layer 112 can be heated to a high temperature, and the adhesive strength thereof can be sufficiently increased.

Further, in the second embodiment, in the bonding step performed after the temporary bonding step, the heating temperature of the first member 111 (first temperature) and the heating temperature of the second member 113 (second temperature) are different. Let me. More specifically, the first member 111 having a large thermal expansion rate is heated at a relatively low temperature. On the other hand, the second member 113, which has a low thermal expansion rate and is difficult to soften, is heated at a relatively high temperature. Therefore, in any of the first member 111 and the second member 113, shrinkage is unlikely to occur after bonding, and the obtained laminated body 200 is unlikely to warp. Further, since the adhesive strength of the first member 111 and the adhesive layer 112 and the adhesive strength of the second member 113 and the adhesive layer 112 are improved, peeling and gaps are unlikely to occur between them, and a highly reliable laminated body is formed. 200 is obtained.

Therefore, the method for manufacturing the laminate of the embodiment can also be applied to, for example, the manufacture of a fluid handling device and the manufacture of various industrial products.

Hereinafter, specific examples of the present invention will be described together with comparative examples, but the present invention is not limited thereto.

[Example 1]
A first member made of rectangular parallelepiped polypropylene (PP, crystallization temperature: 120 ° C.) having a width of 1 cm, a length of 10 cm and a thickness of 0.15 cm, and a rectangular parallelepiped cycloolefin having a width of 1 cm, a length of 10 cm and a thickness of 0.15 cm. A second member made of polymer (COP) was prepared. Then, ZELAS (registered trademark of Mitsubishi Chemical Corporation, melting point: 160 ° C.) manufactured by Mitsubishi Chemical Corporation was placed between the first member and the second member. Then, while heating the first member side to 70 to 110 ° C. (first temperature) by the heating device, the second member side is heated to 110 to 160 ° C. (second temperature) by the heating device (however, the first temperature <first temperature). It was heated to 2 temperatures) and held for 60 seconds. Then, it was air-cooled to obtain a laminated body in which the first member, the adhesive layer, and the second member were laminated.

[Comparative Example 1]
Examples except that the first temperature on the first member side at the time of heating was 80 to 100 ° C. and the second temperature on the second member side was 80 to 100 ° C. (however, the first temperature = the second temperature). A laminated body was produced in the same manner as in 1.

[Comparative Example 2]
Examples except that the first temperature on the first member side at the time of heating was 120 to 140 ° C. and the second temperature on the second member side was 120 to 140 ° C. (however, the first temperature = the second temperature). A laminated body was produced in the same manner as in 1.

[Example 2]
The first member made of rectangular parallelepiped polypropylene (PP, crystallization temperature: 120 ° C) with a width of 1 cm, a length of 10 cm, and a thickness of 0.15 cm and ZELAS manufactured by Mitsubishi Chemical Corporation (registered trademark of the company, melting point: 160 ° C). Was layered, heated at a temperature of 110 to 160 ° C., and temporarily bonded. Then, a second member made of a rectangular parallelepiped cycloolefin polymer (COP) having a width of 1 cm, a length of 10 cm, and a thickness of 0.15 cm was placed on the adhesive layer. Then, while heating the first member side to 70 to 110 ° C. (first temperature) by the heating device, the second member side is heated to 110 to 160 ° C. (second temperature) by the heating device (however, the first temperature <first temperature). It was heated to 2 temperatures) and held for 60 seconds. Then, it was air-cooled to obtain a laminated body in which the first member, the adhesive layer, and the second member were laminated.

[evaluation]
(1) Adhesive strength The laminates produced in Examples and Comparative Examples were fixed to the push-pull gauge and pulled in the direction of pulling the first member and the second member apart. Then, the strength immediately before the adhesive portion is peeled off is defined as the adhesive strength. The results are shown in Table 1.

(2) Warpage The laminates produced in Examples and Comparative Examples were placed on a flat plate, and the thickness at the center of the laminate in the length direction was measured with a dial gauge, and the thickness was set to 0. Then, the thickness of both ends of the laminated body was measured with a dial gauge, and the value obtained by dividing the total thickness of both ends by 2 was taken as the amount of warpage. The results are shown in Table 1.

[result]

As shown in Table 1 above, when both the first temperature and the second temperature were set to 80 to 100 ° C. (however, the first temperature = the second temperature), warpage was unlikely to occur, but the adhesive strength was low. rice field. It is probable that the adhesive strength between the second member and the adhesive layer was low. On the other hand, when both the first temperature and the second temperature were set to 120 to 140 ° C. (however, the first temperature = the second temperature), the adhesive strength was increased, but warpage occurred.

On the other hand, when the temperature of the first member and the temperature of the second member are different temperatures (however, the first temperature <the second temperature) (Examples 1 and 2), the adhesive strength is high and the warp is further increased. Was also unlikely to occur. In particular, when the temporary bonding step was performed, the bonding strength was very high.

According to the method for producing a laminated body of the present invention, a plurality of different members can be firmly bonded without causing warpage. Therefore, it can be applied to various methods for manufacturing laminated bodies, and is also useful for, for example, manufacturing a fluid handling device that requires very strict adhesiveness.

11,111 First member 12, 112 Adhesive layer 13, 113 Second member 21a, 21b Heating member 100, 200 Laminated body

Claims (4)

Adhesion arranged between the first member, the second member made of a material different from the first member, the first member and the second member, and adhering the first member and the second member. A method for manufacturing a laminate having a layer and
The arrangement step of superimposing the first member, the adhesive layer, and the second member in this order,
After the arrangement step, the bonding step of heating the second member to a second temperature different from the first temperature while heating the first member to the first temperature.
Including
At least one of the first member and the second member is a resin.
The thermal expansion rate of the first member is higher than the thermal expansion rate of the second member, and the first temperature is lower than the second temperature.
A method for manufacturing a laminate. The first member contains a crystalline resin and contains
The first temperature is −50 ° C. or higher with respect to the crystallization temperature of the first member and −10 ° C. or lower with respect to the crystallization temperature of the first member.
The second member contains an amorphous resin and contains
The second temperature is −50 ° C. or higher with respect to the melting point of the adhesive layer and lower than the melting point of the adhesive layer.
The method for manufacturing a laminate according to claim 1. Prior to the arrangement step, the first member and the adhesive layer are overlapped and heated to further have a temporary bonding step of adhering the first member and the adhesive layer.
The arranging step is a step of arranging the second member on the adhesive layer bonded to the first member.
The method for producing a laminate according to claim 1 or 2. The first member comprises polypropylene and the second member comprises a cycloolefin polymer.
The method for producing a laminate according to any one of claims 1 to 3.

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