JP6961871B2 - Foam adhesive joint - Google Patents

Description

The present invention relates to a foamed adhesive bonded body in which a foamed member is adhesively bonded to the inner surface of a solid member.

Various foam-bonded bodies are known in which a foam member is bonded to the inner surface of a solid member.

For example, in Patent Document 1, water glass is used as a foaming agent and a thermoplastic resin is mixed to form a foaming raw material, and a solid (solid member) of the thermoplastic resin is formed of the same thermoplastic resin as the foaming raw material to form a solid member. The foamed material and the solid member are sealed and heated in a mold to remove the water glass contained in the open cell foamed portion of the thermoplastic resin so as to have the open cell foamed portion of a single material of the thermoplastic resin. A molded product in which and is heat-sealed has been proposed.

However, Patent Document 1 does not disclose a foamed adhesive joint body in which a solid member is not melted and a gas discharge path is formed in the solid member to bond the foamed member to the solid member made of various materials. ..

Therefore, Patent Document 2 proposes a bonded body in which a foamed member using water glass as a foaming agent and the solid member are adhesively bonded without heat-welding the solid member. This Patent Document 2 is a joint in a spiral gasket composed of a gasket main body formed in a ring shape by spirally winding a metal hoop material together with a filler material of expanded graphite and a metal outer ring, and is a gap portion of an outer peripheral portion of the gasket main body. Inorganic foam gaskets (foaming members) that release water of crystallization and foam when heated, such as sodium silicate (water glass) and sodium borate (borax), are formed to enhance the blocking effect.

However, although the bonded body of Patent Document 2 is adhesively bonded by heating and foaming a foaming agent of water glass, the foamed member is packed in the gap portion of the outer peripheral portion of the gasket body to be foamed and filled. Even if the gasket body and the metal outer ring are regarded as solid members, a gas discharge path is formed in the solid member, the foaming agent of water glass is heated and foamed, and the foamed member is filled in the gas discharge path to form the solid member. It is not configured to be adhesively bonded to the inner surface.

Further, in relation to the relationship between the solid member in which the exposed holes are formed and the foamed member that foams by heating, in Patent Document 3, the metal material is formed on both sides of the resin molded portion formed of the resin material having heat foaming property. In a separator in which two outer plates are laminated using an adhesive or an adhesive, exposed holes are formed in the flange where the outer plates are bent, and the outer surface of the flange and the inner peripheral surface of the vehicle body frame are formed. The resin molded portion is formed by containing a heat-foamable foaming agent in a thermoplastic resin such as polypropylene, for example, in the vehicle body to which the vehicle body is joined, and the vehicle body is heated to raise the temperature of the resin molded portion. As shown in FIG. 6 of Patent Document 3, a part of the resin molded portion is exposed from the exposed hole of the flange portion, and when the foaming is completed, the exposed resin molded portion of the vehicle body frame and the separator By filling the gap between the flange and the resin molded part with the resin molded part exposed from the exposed hole , a large number of bubbles are formed inside the resin molded part by foaming. A sound insulation structure for the vehicle body to be improved has been proposed.

However, the exposed holes in the sound insulation structure of the vehicle body of Patent Document 3 are resin-molded from the exposed holes formed in the flange portion of the outer plate portion by laminating the outer plate portion and the resin molded portion with an adhesive or an adhesive. Although it has the effect of exposing the portion, even if the flange portion of the outer plate portion corresponds to the solid member and the resin molded portion corresponds to the foamed member, the foamed member does not use an adhesive on the inner surface of the solid member. It is not disclosed that the exposed hole is used as a gas discharge path so as to have an adhesive bonding action, and the foamed member not only secures the sound absorbing function due to the foaming but also secures the adhesive bonding function.

Japanese Unexamined Patent Publication No. 2016-64626 Jikken Sho 63-40693 Japanese Unexamined Patent Publication No. 2014-172458

In order to solve the above problems, the present invention provides a foamed adhesive bonded body in which a foamed member is adhesively bonded to a solid member by effectively utilizing a foaming agent of water glass without using an adhesive. The purpose.

The foamed adhesive joint according to claim 1 of the present invention is a foamed adhesive joint in which a foamed member obtained by heat-foaming a foaming raw material having a foaming agent for water glass is bonded to the inner surface of the solid member. The member has a gas discharge path composed of a gap portion communicating with the outside, and the foamed member is adhesively bonded to the inner surface of the solid member by filling the gas discharge path, and the foamed member is sealed from the outside. It is characterized by being provided with a sealing member for stopping.

The foamed adhesive joint of the present invention is a foamed adhesive bonded body in which a foamed member obtained by heat-foaming a foaming raw material having a foaming agent of water glass is bonded to the inner surface of the solid member, and the solid member communicates with the outside. Since it has a gas discharge path composed of voids and the foaming member is filled in the gas discharge path to be adhesively bonded to the inner surface of the solid member, it is not necessary to melt the solid member by heating, and the solid member is adhered. A foam-adhesive bonded body is obtained in which a foaming member is bonded to a solid member by effectively utilizing a foaming agent of water glass without using an agent. Further, when the foamed member is exposed to the outside, water is received from the outside and the water glass is eluted by the moisture, and the adhesive bond between the foamed member and the solid member is liable to deteriorate. Since the foamed adhesive joint is provided with a sealing member for sealing, the foamed adhesive joint is waterproofed, and it is possible to prevent deterioration of the adhesive joint between the foamed member and the solid member even if moisture is received from the outside.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 2 in the first embodiment of the present invention. It is a top view of the foam adhesive joint body in Embodiment 1 of this invention. It is a front view of the foam adhesive joint body in Embodiment 1 of this invention. FIG. 5 is a cross-sectional view taken along the line BB of FIG. 5 in the first embodiment of the present invention. It is a top view of the solid member in Embodiment 1 of this invention. It is a front view of the solid member in Embodiment 1 of this invention. It is sectional drawing in the molding mold at the stage of preparing the molding work of the foam adhesive joint in Embodiment 1 of this invention. It is sectional drawing in the molding mold at the stage of performing the molding work of the foam adhesive joint in Embodiment 1 of this invention. It is sectional drawing which shows the work of taking out the foamed adhesive joint body formed by performing the molding work of the foam adhesive joint body in Embodiment 1 of this invention from a molding die. It is sectional drawing which shows the working state which performs the waterproof treatment by the sealing member in Embodiment 1 of this invention. It is sectional drawing of the foam adhesive joint body which performed the waterproof treatment by the sealing member in Embodiment 1 of this invention. FIG. 3 is a cross-sectional view taken along the line CC of FIG. 13 in the second embodiment of the present invention. It is a top view of the foam adhesive joint body in Embodiment 2 of this invention. It is sectional drawing in the molding mold of the 1st stage which prepares the molding work of the foam adhesive | molded body in Embodiment 2 of this invention. It is sectional drawing in the molding mold of the 2nd stage which prepares the molding work of the foam adhesive | molded body in Embodiment 2 of this invention. FIG. 5 is a cross-sectional view of the inside of a molding mold at a stage where a molding operation of a foamed adhesive joint according to a second embodiment of the present invention of the present invention is performed. It is sectional drawing which shows the working state which performs the waterproof treatment by the sealing member in Embodiment 2 of this invention. It is sectional drawing of the foam adhesive joint body which performed the waterproof treatment by the sealing member in Embodiment 2 of this invention. FIG. 2 is a cross-sectional view taken along the line DD of FIG. 20 according to the third embodiment of the present invention. It is a top view of the foam adhesive joint in Embodiment 3 of this invention. It is a top view of the solid member in Embodiment 3 of this invention. FIG. 21 is a cross-sectional view taken along the line EE of FIG. 21 according to the third embodiment of the present invention. It is sectional drawing in the molding mold of the 1st stage which prepares the molding work of the foam adhesive | molded body in Embodiment 3 of this invention. It is sectional drawing in the molding mold of the 2nd stage which prepares the molding work of the foam-bonded joint body in Embodiment 3 of this invention of this invention. It is sectional drawing in the molding mold at the stage of performing the molding work of the foam adhesive joint in Embodiment 3 of this invention. It is sectional drawing which shows the work of taking out the foamed adhesive joint body formed by performing the molding work of the foam adhesive joint body in Embodiment 3 of this invention from a molding die. It is sectional drawing of the foam adhesive joint body which performed the waterproof treatment by the sealing member in Embodiment 3 of this invention.

(Embodiment 1)
With reference to FIGS. 1 to 6, a foamed adhesive bonded body in which a foamed member obtained by foaming the water glass of the foamed raw material using a foaming raw material having a foaming agent for water glass is adhesively bonded to the inner surface of the solid member. The configuration of is described.

In FIGS. 1 to 3, the foamed member 2 is adhesively bonded to the inner surface (lower surface in FIG. 1) of the solid member 1. The foaming member 2 has a foaming agent for water glass, and when heated, the water glass expands and solidifies while generating a gas containing water vapor (hereinafter referred to as gas), and as described later, the solid member 1 As a foaming raw material having an adhesive action and having a foaming agent for water glass, preferably, olefin resins such as polyethylene and polypropylene exemplified in Reference 1, polyvinyl chloride resin, ABS resin, polyamide resin , polyester resin and The material is a mixture of a thermoplastic resin powder such as a fluororesin, and the material of the foaming raw material is the material of the foaming raw material shown in the second and third embodiments described later. Is the same.

Therefore, in FIGS. 4 to 6, it is not necessary to melt the solid member 1 by heating, and the foaming member 2 is adhesively bonded to the solid member 1 by effectively utilizing the foaming agent of water glass without using an adhesive. The configuration of a gas discharge path for filling the foamed member 2 with a gap formed on the inner surface of the solid member 1 in communication with the outside so that an adhesive bonded body can be obtained is shown.

In FIGS. 4 to 6, the solid member 1 is formed with a gas discharge path 11 formed of a through hole communicating from the inner surface (lower surface in FIG. 4) to the outer surface (upper surface in FIG. 4, which is the outer surface). The gas discharge path 11 of the through hole is formed in a trapezoidal shape in which the inner surface portion has a diameter larger than that of the outer surface. Further, on the inner surface of the solid member 1, gas discharge passages 12 and 13 formed of voids of the concave groove in the vertical and horizontal directions communicating with the gas discharge passage 11 of the through hole are formed. In this way, the gas discharge passage 11 of the through hole formed in the solid member 1 and the gas discharge passages 12 and 13 including the gap portion of the concave groove communicate with the outside. The material of the solid member 1 is the same as that of the solid member shown in the second and third embodiments described later, and is a metal material (for example, stainless steel, iron (containing alloy), aluminum (containing alloy), copper (containing alloy)). ), Wood (eg, cypress, cedar, pine, plywood veneer), rubber material, ceramic material, ceramic material, glass material, and thermoplastic resin materials including Empra (engineering plastic) (eg, olefins such as polyethylene and polypropylene). Resins, polyvinyl chloride resins, ABS resins, polyamide resins, polycarbonate resins, polyacetal resins, polyphenylene sulfide resins, polyimide resins) and thermosetting resin materials (for example, unsaturated polyester resins and epoxy resins). In particular, if the material of the solid member is wood (for example, cypress, cedar, pine, plywood veneer), the inner surface of the solid member 1 is made rough without finishing to smooth the inner surface. By utilizing the property of communicating with the outer surface (outside) to provide air permeability, the property of this wood may be used as a gas discharge path instead of the through hole. The shape of the solid member 1 is rectangular, but any shape such as a circular shape or a curved surface shape can be selected. Further, although the material of the flat plate is illustrated, it may be a material having a three-dimensional shape. The above materials and shapes may be selected according to the application of the foam adhesive joint.

A foamed adhesive joint is composed of a foamed member 2 and a solid member 1 using a foaming raw material having a foaming agent for water glass as described above, and the foamed raw material is heat-foamed on the inner surface of the solid member 1. As a result, the gas discharge passages 11, 12, and 13 formed so as to communicate with the outside become filling portions 21, 22, and 23 by the action of filling the foaming member 2, and the foaming member 2 at the end thereof is the outer peripheral surface thereof. It is exposed to the outside of the solid member 1 together with 2A and the lower surface 2B. In this way, the foamed member 2 is filled in the gas discharge passages 11, 12, and 13 so as to have an exposed portion, and a foamed adhesive bonded body is obtained by adhesively bonding to the inner surface of the solid member 1. In this case, as a configuration in which the solid member 1 and the foamed member 2 are adhesively bonded, although not shown, the lower surface 2B of the foamed member 2 may also be adhesively bonded to the inner surface of another solid member 1. In the first embodiment, a configuration in which a through hole and a recessed groove are combined is shown as a gas discharge path formed by the gap portion, but the gap portion having only the through hole or the gap portion having only the recessed groove is formed. It may be used as a gas discharge path.

(Molding method)
7 to 9 show a working state in which a foamed raw material having a foaming agent for water glass is heat-foamed using a molding die to obtain a foamed adhesive bonded body in which the solid member 1 and the foamed member 2 are adhesively bonded. Is shown.

In FIG. 7, the molding die 3 made of an iron material and made of a box mold having an open upper end is composed of a tubular portion 3A having an open upper and lower ends and a removable bottom portion 3B that closes the lower end of the tubular portion 3A. A hot plate 4 and a hot plate 5 are detachably arranged on the upper surface (the end surface that closes the opened upper end) and the lower surface (the lower surface of the bottom 3B), respectively. A mold release treatment such as a fluororesin coating is formed on the inner wall of the tubular portion 3A of the molding die 3. Further, the hot plate 4 and the hot plate 5 are made of an iron material or an aluminum material so as to be easily heated by a heat source. The hot plate 4 that closes the upper end of the opened tubular portion 3A is formed with a large number of through holes capable of discharging the gas generated during heating and foaming of the foaming raw material 20 having the foaming agent of water glass to the outside. Further, the hot plate 5 arranged on the lower surface of the bottom portion 3B may be integrated with the member of the bottom portion 3B, or may be shared by the same member. Therefore, by closing the lower end of the tubular portion 3A with the bottom portion 3B together with the hot plate 5 on the lower surface, a molding mold 3 of a box mold having an open upper end is formed, and water glass is foamed in the molding mold 3 of the box mold. A foaming raw material 20 formed in the form of powder or granules containing an agent is put in, and a solid member 1 is placed on the upper surface thereof so as to have a space 31 between the hot plate 4 and the solid member 1 and closed. .. In this case, the volume of the space 31 between the hot plate 4 and the solid member 1 expands when the foaming raw material 20 having the foaming agent of water glass expands when the foaming raw material 20 has heat foaming, so that the foaming member 2 expands on the inner surface of the solid member 1. The volume may be set so as to be adhesively bonded to. Although not shown, if a large number of through holes are formed in the bottom of the molding die 3 and the hot plate 5 so that the gas generated during heating and foaming of the foaming raw material 20 having a water glass foaming agent can be discharged to the outside. The solid member 1 may be placed on the bottom of the molding die 3.

In FIG. 8, the hot plate 4 and the hot plate 5 are heated in a state where the foamed raw material 20 and the solid member 1 are placed in the molding die 3, and the foamed raw material 20 and the solid member 1 in the molding die 3 are heat-treated. The foamed raw material 20 is foamed and the gas generated during the foaming is discharged from the gas discharge passages 11, 12, and 13 of the solid member 1 to the outside of the molding die 3 through the through holes of the heat plate 4, and the foamed raw material 20 is foamed. In the process from heating foaming to solidification of 20, the gas discharge passages 11, 12, and 13 of the solid member 1 are filled with the foaming member 2 to become the filling portions 21, 22, 23, and the foaming member 2 at the end thereof is exposed to the outside. Then, a molding member of the foamed adhesive bonded body in which the foamed member 2 is adhesively bonded to the inner surface of the solid member 1 is formed in the molding die 3. In order to take out the foamed adhesive joint formed in this way from the molding die 3, the hot plate 4 is moved in the direction of the arrow (may be upward or horizontal) as shown in FIG. 9, and the upper end of the tubular portion 3A is moved. By opening and moving the bottom portion 3B and the hot plate 5 in the direction of the arrow (may be downward or lateral) to open the lower end of the tubular portion 3A, the foamed adhesive joint formed is the tubular portion of the molding mold 3. Since it is temporarily held in 3A, although not shown, the molded foamed adhesive joint can be extruded from above or below by a pressing force P and taken out from the molding die 3. By taking out the molding member of the foamed adhesive joint body from the molding die 3 in this way, as shown in FIGS. 1 and 2, the gas discharge passages 11, 12, and 13 of the solid member 1 were filled with the foamed member 2. The foamed member 2 at the ends of the filling portions 21, 22 and 23 is exposed to the outside of the solid member 1 together with the outer peripheral surface 2A and the lower surface 2B, and the foamed member 2 is adhesively bonded to the inner surface of the solid member 1. The body is obtained.

(Waterproofing with sealing member)
In the foam adhesive joint, when moisture is received from the outside, the water glass is eluted by this moisture and the adhesive action of the water glass is reduced. It can be used as a recycling method in which the solid member 1 is separated from the foam member 2 and used, but an application requiring a foam adhesive joint that makes it difficult for the adhesive bond between the foam member 2 and the solid member 1 to deteriorate even if moisture is received from the outside. In this case, the foamed adhesive joint may be waterproofed. Therefore, as an example of waterproofing treatment, FIGS. 10 and 11 show a foamed adhesive joint provided with a sealing member that seals the foamed member 2 from the outside.

In FIG. 10, the lid member 61 is made to face the upper surface of the foamed adhesive joint, and the box member 62 having an open upper end is made to face the lower surface of the foamed adhesive joint and moved in the direction of the arrow, respectively, and the lid member 61 and the box member are moved. 62 is polymerized and closely bonded. In this case, the material of the lid member 61 and the box member 62 is a metal material such as a stainless steel material or a synthetic resin material, and the close contact joining of the lid member 61 and the box member 62 can be exemplified by welding or bonding with an adhesive.

By polymerizing the lid member 61 and the box member 62 and tightly joining them to form the sealing member 6, the filling portions 21, 22 and 23 (the filling portions 22 are shown in FIGS. 2 and 3) as shown in FIG. A foamed adhesive joint is obtained in which the foamed member 2 exposed to the outside of the end portion of (shown) and the outer peripheral surface 2A and the lower surface 2B of the foamed member 2 is sealed from the outside by the sealing member 6. In this way, since the sealing member 6 is provided with a waterproof treatment that makes it difficult for the foaming member 2 to receive moisture from the outside, the foamed adhesive bonding body that makes it difficult for the foaming member 2 and the solid member 1 to deteriorate in the adhesive bonding. Is obtained.
(Embodiment 2)

12 and 13 show the configuration of a foamed adhesive joint using a solid member different from that of the first embodiment, and will be described below with reference to the configuration of the solid member 1 in FIGS. 14 and 15.

In FIGS. 12 and 13, the solid member 1 is composed of a plurality of rectangular divided pieces, which are arranged apart from each other, but are made of the same material as in the first embodiment. The plurality of rectangular divided pieces may be arranged in a ring-shaped piece concentrically spaced apart from each other. A gas discharge path 16 having an uneven surface as a gap is formed on the inner surface (lower surface in FIG. 14) of each of the divided pieces of the solid member 1. The gas discharge passage 16 has the same configuration as the void portion of the minute uneven surface formed on the inner surface of the solid members 1A and 1B shown in the third embodiment described later. Further, the adjacent separated portions of the plurality of rectangular divided pieces form a gas discharge path 14 (see FIGS. 14 and 15), and have the same configuration as the gas discharge path of the through hole shown in the first embodiment. By heating and foaming the foaming raw material having the foaming agent of water glass through the gas discharge passage 16 and the gas discharge passage 14, the gas discharge passage 16 on the inner surface of each of the plurality of divided pieces of the solid member 1 is formed. The foaming member 2 is filled to become the filling portion 26, and the gas discharge path 14 at the separated portion of the solid member 1 is also filled with the foaming member 2 to become the filling portion 24. It is exposed to the outside of the solid member 1. Further, the filling portion 24 connects a plurality of divided pieces to form one solid member 1, and a foamed adhesive bonded body in which the foamed member 2 is adhesively bonded to the inner surface thereof can be obtained. At this time, the gas discharge passage 15 on the outermost peripheral surface of the foamed adhesive joint is filled with the foaming member 2 to form an annular filling portion 25, and a plurality of divided pieces are reinforced by the filling portion 24 to reinforce one. The foaming member 2 is filled with the foaming member 2 in the gas discharge path 16 on the inner surface of the solid member 1 to form the filling portion 26, and the foaming member 2 adhesively bonded to the inner surface of the solid member 1 is formed on the outer peripheral surface 2A and the outer peripheral surface 2A. The lower surface 2B is exposed to the outside of the solid member 1 together with the filling portions 24, 25, and 26.

(Molding method)
14 to 16 show a hot plate 4 and a hot plate 5 made of an iron material or an aluminum material so that they can be easily heated by a heat source. The working state is shown in which the foaming raw material to be possessed is heated and foamed to obtain a foamed adhesive bonded body in which the solid member 1 composed of the plurality of rectangular divided pieces and the foamed member 2 are bonded and bonded.

In FIG. 14, the molding die 3 having an open upper end has the same configuration as that of the first embodiment, and is composed of a tubular portion 3A having an open upper and lower ends and a removable bottom portion 3B that closes the lower end of the tubular portion 3A. A hot plate 5 is detachably arranged on the lower surface of 3 (the lower surface of the bottom 3B). In this case, although the hot plate 5 is arranged on the lower surface of the bottom portion 3B, it may be integrated with the member of the bottom portion 3B, or may be shared by the same member. Further, a mold release treatment such as a fluororesin coating is formed on the inner wall of the tubular portion 3A of the molding die 3. Using the tubular portion 3A, the bottom portion 3B, and the hot plate 5 configured in this way, the hot plate 5 is integrated with the lower surface of the bottom portion 3B to close the lower surface of the tubular portion 3A, and the upper end is opened. The foaming raw material 20 having a foaming agent for water glass is formed into powder or granules, and the foaming raw material 20 is placed in a molding die 3 having an open upper end, and is a solid composed of a plurality of rectangular divided pieces. The member 1 is put into the molding die 3 from the direction of the arrow.

In FIG. 15, a solid member 1 is arranged on the upper surface of a foamed raw material 20 placed in a molding die 3 having an open upper end via a space 31 and closed by a hot plate 4. The solid members 1 are arranged so as to be separated from each other, and the adjacent separated portions of the plurality of divided pieces are used as a gas discharge path 14, and the lower surface of each divided piece is used as a gas discharge path 16, and the solid members 1 are arranged so as to be separated from each other. The outermost outer peripheral surface of the divided piece is arranged in the molding die 3 via a gap with the tubular portion 3A of the molding die 3, and this gap serves as a gap portion forming the gas discharge path 15. At this time, a space portion 31 similar to that in the first embodiment is provided between the hot plate 4 and the solid member 1, and the volume of the space portion 31 expands when the foaming raw material 20 is heated and foamed. The volume may be set so that the foamed member 2 is adhesively bonded to the inner surface of the solid member 1. Although not shown, if a large number of through holes capable of discharging the gas generated during heating and foaming of the foaming raw material 20 to the outside are formed in the bottom of the molding die 3 and the hot plate 5, a plurality of solid members 1 can be formed. It may be placed on the bottom of the molding die 3 so that the gas discharge path 16 of the divided piece faces the upper surface.

In FIG. 16, the foamed raw material 20 and the solid member 1 are placed in the molding die 3, the hot plate 4 and the hot plate 5 are heated, and the foamed raw material 20 and the solid member 1 in the molding die 3 are heat-treated to foam. The gas generated when the raw material 20 foams is discharged to the outside of the molding die 3 from the gas discharge passages 14, 15 and 16 formed by the voids of the solid member 1 through the through holes of the heat plate 4, and heats the foamed raw material 20. In the process from foaming to solidification, the gas discharge passages 14, 15 and 16 of the solid member 1 are filled with the foaming member 2 to become filling portions 24, 25 and 26, respectively, and the foaming member 2 at the end thereof is exposed to the outside. A molding member of a foamed adhesive joint in which the foamed member 2 is adhesively bonded to the inner surface of the solid member 1 is formed in the molding die 3. In order to take out the foamed adhesive joint thus formed from the molding die 3, although not shown, the hot plate 4 and the bottom portion 3B are moved to open the upper end and the lower end of the tubular portion 3A as shown in the first embodiment. As shown in FIGS. 12 and 13, the molded foamed adhesive joint body temporarily held in the tubular portion 3A of the molding mold 3 is extruded and the molded foamed adhesive joint body is taken out from the tubular portion 3A. A solid member 1 in which the foamed member 2 is a divided piece becomes one solid member 1, and a foamed adhesive bonded body is obtained by adhesively bonding to the inner surface thereof.

(Waterproofing with sealing member)
17 and 18 show a foamed adhesive joint provided with a sealing member so as to make it difficult to receive moisture from the outside as in the first embodiment.

In FIG. 17, the portion where the foaming member 2 at the end of the filling portions 24, 25, 26 filled with the foaming member 2 is exposed to the outside of the solid member 1, and the outer peripheral surface 2A and the lower surface 2B of the foaming member 2 are also exposed to the outside. The lid member 61 is made to face the upper surface (the surface opposite to the lower surface 2B) of the foamed adhesive joint having the formed portion, and the box member 62 having an open upper end is made to face the lower surface 2B of the foamed adhesive joint. The box member 62 is moved in the direction of the arrow, and the lid member 61 and the box member 62 are overlapped and adhered to each other. By tight junction joining the lid member 61 and the box member 62 in this way, as shown in FIG. 18, the exposed portion of the foam member 2 is sealed from the outside by the sealing member 6 as in the first embodiment. The body is obtained. In this case, the material of the lid member 61 and the box member 62 constituting the sealing member 6 is a metal material such as a stainless steel material or a synthetic resin material as in the first embodiment, and the lid member 61 and the box member 62 are closely welded. Examples include welding and joining with an adhesive. Since the foamed member 2 is sealed from the outside by the sealing member 6 to make it difficult to receive moisture, a foamed adhesive joint body in which the adhesive joint between the foamed member 2 and the solid member 1 is less likely to be deteriorated can be obtained. ..
(Embodiment 3)

19 to 22 show the configuration of the foamed adhesive joint body different from that of the first embodiment in the gas discharge path formed on the inner surface of the solid member, and the configuration of the foamed adhesive joint body will be described below.

In FIGS. 21 and 22, the solid member is composed of a pair of solid members 1A and 1B made of the same material as in the first embodiment, and the inner surface of each solid member 1A and 1B has a gap of a minute uneven surface communicating with the outside. A gas discharge path 16 formed of the portion is formed. The gas discharge path 16 does not have the through hole shown in the first embodiment.

In FIGS. 19 and 20, the foaming raw material having the foaming agent of water glass is heated and foamed, so that the gas discharge passages 16 of the solid members 1A and 1B are filled with the foaming member 2 to form the filling portion 26, and the ends thereof. The foaming member 2 of the portion is located on the outer peripheral surface 2A of the foaming member 2, and the outer peripheral surface 2A is exposed to the outside and the foaming member 2 is adhesively bonded to the inner surfaces of the solid members 1A and 1B to obtain a foamed adhesive joint. Be done.

(Molding method)
In FIGS. 23 to 26, a foamed raw material having a foaming agent for water glass is heated and foamed using a molding die to obtain a foamed adhesive bonded body in which the solid members 1A and 1B and the foamed member 2 are adhesively bonded. Indicates the working status.

FIG. 23 shows the first step of preparing the molding work of the foam adhesive joint. In FIG. 23, the molding die 30 made of an iron material and made of a box mold having an open upper end comprises a tubular portion 30A having an open upper and lower ends and a removable bottom portion 30B that closes the lower end of the tubular portion 30A. A hot plate 40 and a hot plate 5 are detachably arranged on the upper surface (the end surface that closes the opened upper end) and the lower surface (the lower surface of the bottom portion 30B), respectively, and the hot plate 40 and the hot plate 5 are heat sources. It is made of iron or aluminum so that it can be easily heated by. Similar to the first embodiment, a mold release treatment such as a fluororesin coating is formed on the inner wall of the tubular portion 30A, and a plurality of recesses 32 communicating with each other inside and outside are formed on the peripheral wall surfaces at the upper end and the lower end. .. Further, although the hot plate 5 is arranged on the lower surface of the bottom portion 30B, it may be integrated with the member of the bottom portion 30B or may be shared by the same member. In this way, the lower end of the tubular portion 30A is closed by the bottom portion 30B together with the hot plate 5 on the lower surface to form the molding mold 30 of the box mold having an open upper end, and the solid member is formed in the molding mold 30 of the box mold. 1A is arranged so that the gas discharge path 16 is on the upper surface, and the foaming raw material 20 having a water glass foaming agent and formed in powder form or granules is placed on the upper surface of the solid member 1A (the surface on which the gas discharge path 16 is formed). ).

FIG. 24 shows the second step of preparing the molding work of the foam adhesive joint. In FIG. 24, the solid member 1B is arranged on the upper surface of the foamed raw material 20 at a distance from each other via the space 31 so that the gas discharge path 16 is on the lower surface, and then the hot plate 40 is placed on the upper end of the molding die 30. By placing the foam raw material 20 and the solid members 1A and 1B shown in FIG. 25, the foamed raw material 20 and the solid members 1A and 1B are put into the molding die 30 and closed.

In FIG. 25, in a state where the foamed raw material 20 and the solid members 1A and 1B are placed in the molding die 30, the heating plate 40 and the heating plate 5 are heated, and the foamed raw material 20 and the solid members 1A and 1B in the molding die 30 are heated. The gas generated when the foaming raw material 20 is foamed by the heat treatment is formed from the gas discharge passages 16 of the solid members 1A and 1B through a plurality of recesses 32 formed on the peripheral wall surfaces of the upper and lower ends of the molding die 30. The gas is discharged to the outside of the molding die 30 through the molding die 30, and in the process from heat foaming to solidification of the foaming raw material 20, the gas discharge passages 16 of the solid members 1A and 1B are filled with the foaming member 2 to become the filling portion 26, and the end portion thereof. The foamed member 2 is exposed to the outside of the solid members 1A and 1B, and the lower surface and the upper surface of the foamed member 2 are bonded to the inner surfaces of the solid members 1A and 1B, respectively. Is formed in.

In order to take out the foamed adhesive joint formed in this way from the molding die 30, the hot plate 40 is moved in the direction of the arrow (may be upward or horizontal) as shown in FIG. 26, and the upper end of the tubular portion 30A is moved. By opening and moving the bottom portion 30B and the hot plate 5 in the direction of the arrow (may be downward or lateral) to open the lower end of the tubular portion 30A, the foamed adhesive joint formed is the tubular portion of the molding die 30. Since it is temporarily held at 30A, it is not shown, but if this molded foam adhesive joint is extruded from above or below with a pressing force P and taken out from the molding die 30, it will be solid as shown in FIGS. 19 and 20. The gas discharge passages 16 of the members 1A and 1B are filled with the foaming member 2 to form a filling portion 26, and the foaming member 2 at the end thereof is exposed to the outside of the solid members 1A and 1B, and the lower surface and the upper surface of the foaming member 2 are solid, respectively. A foam adhesive joint body is obtained which is adhesively bonded to the inner surfaces of the members 1A and 1B. As the solid member, a pair of upper and lower parts is illustrated, but only the upper part or the lower part may be used.

(Waterproofing with sealing member)
FIG. 27 shows a foamed adhesive joint with a sealing member.

In FIG. 27, as shown in FIG. 19, the foaming member 2 at the end of the filling portion 26 of the foaming member 2 adhesively bonded to the solid members 1A and 1B and the outer peripheral surface 2A of the foaming member 2 are the solid members 1A and 1B. Since it is exposed to the outside, the sealing member 60 formed in a tubular shape is tightly bonded to the solid members 1A and 1B to seal the exposed foam member 2 portion, thereby making it difficult to receive moisture from the outside. A waterproof foam adhesive joint can be obtained. In this case, the material of the sealing member 60 is a metal material such as a stainless steel material or a synthetic resin material, and the close contact bonding between the sealing member 60 and the solid members 1A and 1B can be exemplified by welding, bonding with an adhesive, or a thin film layer. Since the foamed member 2 is sealed from the outside of the foamed adhesive joint in this way, it is made difficult to receive moisture, and the foamed member 2 and the solid members 1A and 1B are adhesively bonded as in the first embodiment. A foamed adhesive joint that is less likely to deteriorate can be obtained.

The present invention is useful for lightweight reinforcing materials, cushioning materials, heat insulating materials, sound absorbing materials or filtering materials.

1, 1A, 1B Solid member 2 Foaming member 11, 12, 13, 14, 15, 16 Gas discharge passage 6, 60, 61, 62 Sealing member 21, 22, 23, 24, 25, 26 Filling part

Claims (1)

In a foamed adhesive bonded body in which a foamed member obtained by heat-foaming a foaming raw material having a water glass foaming agent is bonded to the inner surface of the solid member, the solid member has a gas discharge path composed of a void portion communicating with the outside. The foaming member is filled with the gas discharge path so that the foaming member is adhesively bonded to the inner surface of the solid member, and the foaming member is provided with a sealing member for sealing the foaming member from the outside. Adhesive joint.

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