JP5836920B2 - Honeycomb sandwich panel and elevator car using it as a car flooring - Google Patents

Description

  The present invention relates to a honeycomb sandwich panel formed by joining a honeycomb and a flat plate with an adhesive, and an elevator car using the honeycomb sandwich panel as a car floor material.

  In a conventional elevator car, a honeycomb plate is bonded in a sandwich between upper and lower metal plates, and a frame-shaped fixing member is disposed so as to surround the outer peripheral portion of the honeycomb plate between the upper and lower metal plates. A car floor was formed by bonding to upper and lower metal plates, and the upper and lower metal plates were fixed to a floor frame and a baseboard together with a fixing member (see, for example, Patent Document 1).

  However, Patent Document 1 discloses that a honeycomb sandwich panel formed by bonding a honeycomb plate between upper and lower metal plates in a sandwich shape is applied to an elevator car floor material. No mention is made as to what adhesive is used to bond the honeycomb plate.

  The adhesion between the metal plate and the honeycomb plate is different from the adhesion between the metal plates, that is, the surfaces, and it is important that the fillet is formed between the metal plate and the honeycomb plate. And in order to obtain big adhesive strength, it is necessary to increase a fillet and the usage-amount of an adhesive agent will increase compared with adhesion | attachment of surfaces. Further, unlike the bonding between the surfaces, the resin portion exposed to the air is widened and easily affected by thermal oxidation. Furthermore, when the honeycomb sandwich panel is applied to a car floor material, it becomes a large panel, so that peeling at the bonded portion is likely to occur due to a difference in thermal expansion coefficient between the adhesive and the panel member.

  As described above, when the honeycomb sandwich panel is applied to an elevator car flooring, it is required to reduce the coating amount of the adhesive to ensure the adhesive strength and durability.

  For example, Patent Document 2 proposes a technique in which a face plate and a honeycomb core are bonded with a silicone-based adhesive to form a honeycomb sandwich panel to reduce thermal deformation due to a difference in thermal expansion coefficient.

  Patent Document 3 discloses a self-adhesive honeycomb curing method in which prepreg is laminated on both sides of a honeycomb core and heated to simultaneously cure the prepreg and bond the prepreg and the honeycomb core. A technique has been proposed in which fillet formability is improved by controlling the amount within a predetermined range, and the adhesive strength is increased by reducing the amount of resin, that is, an adhesive.

  Further, in Patent Document 4, a resin having a viscosity at a fillet molding temperature of 3 to 3000 poise and a flow performance index of 2 to 60 is used to bond the core and the skin (surface plate) to the core and the skin. A technique has been proposed in which a good fillet having a concave cross-sectional curve is formed spreading on the surface of the face plate, and mechanical performance such as compressive strength and tensile strength is improved.

Japanese Patent No. 2723328 JP 2002-219759 A JP 2000-238154 A Japanese Patent Laid-Open No. 02-78536

  Since the honeycomb sandwich panel described in Patent Document 2 is configured by bonding a face plate and a honeycomb core with a silicone-based adhesive, it is excellent in heat resistance of the bonded portion and followability to stress during cooling. However, the honeycomb sandwich panel described in Patent Document 2 is unsuitable for application to an elevator floor because the adhesive is too soft to ensure rigidity.

  In the honeycomb sandwich panel described in Patent Document 3, since the prepreg and the honeycomb core are bonded using the resin in the prepreg, the amount of the adhesive used is reduced and the cost is reduced. However, since the prepreg and the honeycomb core are bonded using a resin that exudes from the prepreg during heating, porosity is generated inside the prepreg when the fillet height is higher than 700 microns. This fillet has a great influence on the adhesion between the prepreg and the honeycomb core, and it is preferable to increase the fillet height in order to obtain a large adhesive strength. However, since the honeycomb sandwich panel described in Patent Document 3 cannot increase the height of the fillet, it cannot secure high adhesive strength and excellent durability, and is not suitable for application to an elevator flooring.

In Patent Document 4, it is said that an FWT (flatwise) strength of 15 kg / cm ² or more can be obtained by forming a good fillet having a concave cross-sectional curve at the bonded portion between the core and the surface plate. No mention is made as to whether an effect on durability is recognized. Since the FWT test is performed by pulling up the surface plate in a state of surface bonding, even if the bonded portion becomes hard and brittle, it is easy to obtain a large strength. However, the cross-sectional shape of the fillet in Patent Document 4 is that the resin spreads on the surface of the core and the surface plate and is formed in a concave shape, and the thickness of the fillet becomes thinner toward the end, so stress concentrates on the end of the fillet and peels off. The starting point of occurrence is likely to occur. The climbing peel test is a method for measuring the peel resistance of a resin as a bulk body by rolling up the surface plate. In particular, when a load such as a heat cycle is applied, in the honeycomb sandwich panel described in Patent Document 4, High peeling torque cannot be obtained, excellent durability cannot be ensured, and it is unsuitable for application to elevator flooring.

  The present invention has been made in order to solve the above-described problems, and reduces the amount of adhesive applied to ensure adhesive strength and durability, and is inexpensive and applicable to elevator car flooring. An object of the present invention is to obtain a honeycomb sandwich panel and an elevator car using the honeycomb sandwich panel as a car flooring.

A honeycomb sandwich panel according to the present invention includes a honeycomb and a pair of surface plates arranged so as to sandwich the honeycomb, and the honeycomb and the surface plate are bonded and fixed by an adhesive. The adhesive is an adhesive having a storage elastic modulus after curing at 20 ° C. of 100 MPa or more, and is formed by applying and curing the adhesive on the adhesive surface of the surface plate, at least 1 mm in height, Convex-shaped first beads having a bulging cross-sectional curve containing a bulk having a diameter of 4 mm are discretely arranged, and the honeycomb and the surface plate are bonded and fixed by the first bead . the total length of the bead and the length direction of the edges of the cells in the contact portion between the honeycomb is 10% or more of the total length of the edges of the cells constituting the honeycomb, Ru der than 50%.

  According to this invention, since the adhesive is an adhesive having a storage elastic modulus after curing at 20 ° C. of 100 MPa or more, rigidity applicable to the elevator car flooring can be obtained. Further, since the adhesive is discretely applied to the adhesive surface of the surface plate, the amount of adhesive applied can be reduced, and the cost can be reduced. Since the first bead is formed in a size that incorporates at least a bulk of 1 mm in height and a diameter of 4 mm, the adhesive strength can be increased, and embrittlement of the resin due to thermal oxidation can be effectively suppressed, and the high temperature can be increased. Side durability can be increased. Further, since the first beads are arranged discretely, there is no propagation of resin cracks during cooling or cracks at the interface to other beads, and durability on the low temperature side can be improved. Furthermore, each of the first beads is formed in a convex shape having a bulging cross-sectional curve and is discretely arranged, so that an absolute value for peeling is increased, and durability of the climbing drum peeling of the adhesive is increased. Can be achieved with a small amount of adhesive.

It is a figure explaining the adhesion structure of the evaluation panel of the honeycomb sandwich panel concerning Example 1 of this invention. It is a figure explaining the adhesion structure of the evaluation panel of the honeycomb sandwich panel concerning Example 2 of this invention. It is a figure explaining the adhesion structure of the evaluation panel of the honeycomb sandwich panel concerning Example 3 of this invention. It is a figure explaining the adhesion structure of the evaluation panel of the honeycomb sandwich panel concerning Example 4 of this invention. It is a figure explaining the adhesion structure of the evaluation panel of the honeycomb sandwich panel concerning Example 5 of this invention. It is a figure explaining the adhesion structure of the evaluation panel of the honeycomb sandwich panel concerning Example 6 of this invention. It is a figure explaining the adhesion structure of the evaluation panel of a honeycomb sandwich panel concerning Example 7 of this invention. It is a figure explaining the adhesion structure of the evaluation panel of the honeycomb sandwich panel concerning Example 8 of this invention. 6 is a diagram illustrating an adhesion structure of an evaluation panel of a honeycomb sandwich panel of Comparative Example 1. FIG. 6 is a diagram for explaining an adhesion structure of an evaluation panel of a honeycomb sandwich panel of Comparative Example 2. FIG. It is a figure explaining the adhesion structure of the evaluation panel of the honeycomb sandwich panel of the comparative example 3. It is a figure explaining the adhesion structure of the evaluation panel of the honeycomb sandwich panel of comparative example 4. It is a figure explaining the adhesion structure of the evaluation panel of the honeycomb sandwich panel concerning Example 9 of this invention. It is a schematic diagram which shows the groove shape of the comb-shaped iron used for application | coating of an adhesive agent. It is a figure explaining the adhesion structure of the evaluation panel of the honeycomb sandwich panel concerning Example 10 of this invention. It is a figure explaining the adhesion structure of the evaluation panel of the honeycomb sandwich panel concerning Example 11 of this invention.

  The honeycomb sandwich panel according to the present invention is manufactured by bonding and fixing a honeycomb which is an aggregate of cells and a surface plate stacked on both sides thereof. And considering that it is applied to applications where people such as elevator car flooring get on, it is not a soft adhesive such as silicone adhesive or modified silicone adhesive, but epoxy resin, urethane resin, acrylic resin, phenol resin, etc. A structural adhesive having a high elastic modulus after curing is used as a polymer. From the viewpoint of rigidity, it is desirable that the storage elastic modulus at room temperature after curing of the adhesive is 100 MPa or more.

  The thickness of the honeycomb sandwich panel is suitably 5 mm to 100 mm. In order to ensure rigidity, the structure may be a combination of a honeycomb sandwich panel and a reinforcing material. When the reinforcing material is used frequently, the thickness of the honeycomb sandwich panel is about 5 mm. When the reinforcing material is reduced, the thickness of the honeycomb sandwich panel is set to about 100 mm to ensure rigidity. In the present invention, the durability of the bonded portion can be improved regardless of the thickness of the honeycomb sandwich panel.

  The area of the honeycomb sandwich panel is about 1000 mm × 1000 mm when using a plurality of sheets, and about 2500 mm × 2500 mm when using a single sheet.

  When the volume of a lump (hereinafter referred to as a bead) obtained by curing the adhesive protruding from the bonding surface between the honeycomb and the surface plate is small, thermal oxidation occurs and the resin becomes brittle. Moreover, when the adhesive is thickly spread and cured, the elastic modulus of the cured adhesive is increased during cooling, and the cured adhesive is easily cracked or peeled off from the surface plate. The applicant can effectively suppress the embrittlement of the resin due to thermal oxidation by using a bead having a size of at least 1 mm in height and 4 mm in diameter, and disposing the beads discretely. As a result, it was found that cracking of beads during peeling and occurrence of peeling from the surface plate can be effectively suppressed, and the present invention has been invented.

  Making a bead having a size of at least a 1 mm high and a 4 mm diameter built-in bulk increases the volume of the bead and leads to a dramatic improvement in heat resistance and oxidation resistance. Therefore, in a practical temperature range, the resin itself becomes an oxidation-resistant barrier layer, the toughness inside the bead is ensured, and the durability on the high temperature side of the bonded portion is enhanced.

  Further, by forming the bead into a convex shape having a cross-sectional curve that bulges out, the side surface in the cross-section has a bulge and the bead end is thick. Therefore, the stress concentration at the end of the bead can be reduced, and the occurrence of cracks at the interface from the honeycomb or the surface plate can be effectively suppressed. Increasing the peeling torque can effectively suppress the progress of breakage at the interface caused by heat cycle or vibration. In addition, even in a fillet having a concave cross-sectional curve as in Patent Document 4, it is possible to incorporate a bulk having a height of 1 mm and a diameter of 4 mm. However, in such a fillet, an adhesive layer of the fillet is used. The thickness of the film becomes thinner toward the end, and the ease of occurrence of the occurrence of peeling is not improved.

  By making a bead having a size of at least 1 mm in height and a bulk having a diameter of 4 mm, an absolute value for peeling increases by itself, and generation of peeling from the surface plate can be suppressed. Furthermore, by arranging the beads discretely, that is, discontinuously, even if a resin crack or an interface crack occurs in one bead, the crack or crack does not propagate to other beads. Thereby, the durability on the low temperature side in the bonded portion is enhanced.

  The height of the bead should just be 1 mm or more, and it is preferable to set to the height range of 1.2 mm-8 mm from a viewpoint of shape maintenance. Moreover, since the adhesive strength when viewed as a panel is evaluated as a surface, even if the beads are arranged discretely, the function can be sufficiently achieved if force is transmitted.

  If the places bonded with beads having a bulk of at least 1 mm in height and 4 mm in diameter are distributed as a whole, the total length of the bonded area is 10 times the total length of the contact portion between the honeycomb and the surface plate. By setting it as% or more, sufficient adhesive strength can be ensured. Note that if the total length of the bonding regions is less than 10% of the total length of the contact portion between the honeycomb and the surface plate, there is a possibility that the bonding strength varies. In addition, when the total length of the adhesion region is larger than 50% of the total length of the contact portion between the honeycomb and the surface plate, the resin flows and it is difficult to dispose the adhesive discretely. Therefore, it is desirable that the total length of the adhesion region is 50% or less of the total length of the contact portion between the honeycomb and the surface plate. Note that the total length of the adhesive region is the total length in the length direction of the cell side at the contact portion between the bead and the honeycomb (the total length in the length direction of the region in contact with the bead on the cell side). It is. The total length of the contact portion between the honeycomb and the surface plate is the total length of the sides of the cells constituting the honeycomb.

The upper limit of the application amount of the adhesive is not particularly specified, but practically, it only needs to have a peeling torque of about 20 N · mm / mm after the durability test. Therefore, the application amount of the adhesive may be set within a range in which a peeling torque of about 20 N · mm / mm is obtained after the durability test. Moreover, if the lump of adhesive having a height of 1.3 mm with a bottom surface of 10 mm in diameter is cured to form a bead containing a bulk having a height of 1 mm and a diameter of 4 mm, the amount of adhesive applied can be reduced. By setting it to 100 g / m ² or more, sufficient adhesive strength can be ensured.

  As the adhesive used in the present invention, an epoxy adhesive, an acrylic adhesive, a urethane adhesive, a phenol adhesive, or the like is used. These adhesives may be modified by rubber modification, and may be filled with organic or inorganic fillers. The form of curing of the adhesive may be thermosetting, anaerobic, reactive, or moisture-curing, but from the viewpoint of ease of production, a reactive type that can control the curing reaction rate by changing the heating temperature. The adhesive is desirable. Furthermore, since thermal stress increases when heated, the temperature during curing should be low, and a two-component reactive type that is preferably an adhesive that cures at 80 ° C. or lower, and that cures at room temperature at 50 ° C. or lower. More desirable.

  Considering that this honeycomb sandwich panel is applied to applications such as elevator car flooring, it is necessary to have a hardness that can ensure the rigidity of the panel. Soft adhesives such as silicone adhesive are not suitable. is there. Therefore, the adhesive used is preferably an adhesive having a storage elastic modulus E ′ of the cured product in a tensile mode at a frequency of 1 Hz at 20 ° C. of 100 MPa or more. Is desirable. Further, when the storage elastic modulus E ′ exceeds 4000 MPa, the cured product becomes too hard and the heat cycle property is lowered, so that it is desirable to set it to 4000 MPa or less.

  The storage elastic modulus of the cured product is a value obtained by separately preparing a cured adhesive film of 1 mm × 5 mm × 20 mm in order to measure the elastic modulus when producing a product.

If the applied adhesive flows before curing, it becomes difficult to form a bead having a size of at least 1 mm in height and a bulk with a diameter of 4 mm. It is desirable that the minimum value of the viscosity of the adhesive is 10,000 mPa · s or more. From the viewpoint of easy formation of a bead having a size of at least 1 mm in height and a bulk with a diameter of 4 mm, and ease of conformity between the adhesive and the surface plate during application, the viscosity of the adhesive is 15000 mPa · s to 100000 mPa · More preferably, s. Also, there is no upper limit of the viscosity of the adhesive, but when the adhesive is spread and applied to the surface plate by a manual operation such as a comb iron, a certain degree of viscosity is required, and it is preferably 400,000 mPa · s or less.
The thixotropy of the adhesive is not particularly specified, but a thixo such that a bead having a size of 1 mm in height and 4 mm in diameter when it is cured becomes a convex shape having a bulging cross-sectional curve. It is important to have sex.

  It is desirable to apply the adhesive to the face plate in order to create a fillet shape of the adhesive. The method of applying the adhesive is not particularly limited, but may be applied using an air pressure feed type or plunger type pump. Alternatively, the adhesive may be applied in the form of dots or lines using an automatic machine, or may be applied using a spatula or a comb iron to spread the adhesive.

  The honeycomb is preferably made of metal, and more preferably an aluminum alloy. The aluminum alloy is desirably 3003 or 5052 from the viewpoint of availability. The thickness of the aluminum alloy is preferably 0.05 mm to 0.3 mm, and more preferably 0.1 mm or less from the viewpoint of weight reduction. The honeycomb is manufactured using, for example, a laminated plate in which an aluminum alloy foil is bonded with an adhesive or joined by brazing.

  The shape of the cell is not particularly limited, such as a triangle, a quadrangle, or a hexagon, but a regular hexagon is desirable from the viewpoint of availability. When the shape of the cell is a regular hexagon, the length of one side of the regular hexagon is generally 3 mm to 20 mm, but from the viewpoint of the contact point with the adhesive, the length of one side of the regular hexagon is It is desirable to use a material that is 3 mm to 10 mm, and it is more desirable to use a material that is 3 mm to 6 mm.

  It is not necessary to apply special surface treatment to the honeycomb surface made of aluminum alloy, but surface treatment such as phosphoric acid, chromium, zirconium and manganese chemical treatments and anodization is applied to provide adhesion and corrosion resistance. May be given.

  The surface plate may be any material that can ensure rigidity. For example, aluminum alloy, stainless steel, painted steel plate, galvanized steel plate, nickel plated steel plate, ZAM steel plate (registered trademark of Nisshin Steel), fiber reinforced resin, resin and metal A composite plate, marble, artificial marble or the like can be used, and an aluminum alloy is desirable from the viewpoint of availability and weight reduction. The surface plate is subjected to surface treatment such as mechanical polishing, cleaning with alkali, acid, water, organic solvent, etc., short UV irradiation with a wavelength of 254 nm or less, plasma treatment, flame treatment or ozone treatment to improve the adhesion. Also good. Or a primer may be apply | coated to a surface board and adhesiveness may be improved.

  The surface plate to which the adhesive is applied and the honeycomb are superposed, the adhesive is cured while being pressurized, and then the pressure is released to bond the honeycomb and the surface plate. As a pressurizing method, for example, a method of uniformly placing a weight stone or a method by vacuuming can be used. Moreover, you may heat so that the viscosity of an adhesive agent may not fall too much, may be pressurized. A hot press may be used.

If the pressure is less than 10 gf / cm ² , the pressure is too small to obtain good adhesive strength, and if it is greater than 30 kg / cm ² , there is a risk of deformation of the manufactured honeycomb sandwich panel. It is desirable to set to 10 gf / cm ^{2 to} 30 kg / cm ^2, and it is more desirable to set to 50 gf / cm ² to ⁵ kg / cm ² .

When the adhesive is hard to flow and the viscosity is such that the adhesive applied to the upper surface plate does not sag, the honeycomb is sandwiched between the upper and lower surface plates to which the adhesive has been applied, and bonded in one step. A honeycomb sandwich panel may be produced.
Also, if the adhesive is easy to flow and the viscosity is such that the adhesive applied to the upper surface plate drips down, one surface plate coated with the adhesive is stacked on one side of the honeycomb, and one surface plate May be bonded on the lower side, and then the other surface plate coated with the adhesive may be stacked on the other surface of the honeycomb, and the other surface plate may be bonded on the lower side to produce a honeycomb sandwich panel.

Hereinafter, the present invention will be described specifically by way of examples. The results of Examples and Comparative Examples are shown in Table 1.
Here, the peeling torque of the samples produced in the examples and comparative examples was measured according to the ASTM-D1781 climbing drum peel method after 300 heat cycles of 100 ° C. × 60 minutes → −20 ° C. × 60 minutes. did. The measurement was performed at 23 ° C. with a crosshead speed of 25 mm / min. The shape of the honeycomb cell was a regular hexagon.

Example 1.
FIG. 1 is a view for explaining an adhesion structure of an evaluation panel of a honeycomb sandwich panel according to Example 1 of the present invention. FIG. 1 (a) is a cross section of the evaluation panel honeycomb cut by a plane perpendicular to the height direction. FIG. 1B schematically shows a cross-section of the evaluation panel cut by a plane parallel to the height direction.

  The honeycomb 1 was made of an aluminum A3003-H19 material having a foil thickness of 0.06 mm, a cell size of 6 mm on one side, and a height of 20 mm in a rectangular shape of 75 mm (short direction) × 240 mm (longitudinal direction). The honeycomb 1 developed in the direction of 240 mm. That is, the cells were arranged in a direction in which the two opposite sides of the cell were orthogonal to the direction (longitudinal direction) of 240 mm. The lower surface plate 3 was made of aluminum A5052-H34 and made into a flat plate of 75 mm × 300 mm × 1 mm. The upper surface plate 2 was made of aluminum A5052-H34 and formed into a flat plate of 75 mm × 240 mm × 2 mm.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, an epoxy-amine curing type two-component mixed epoxy adhesive adjusted to a viscosity of 35000 mPa · s was pumped using a plunger-type pump, mixed with a static mixer, and then mixed with a wiping machine. It was discretely applied to the bonding surface of the face plate 2 and the lower surface plate 3. At this time, the application amount of the adhesive was 135 g / m ² . Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by allowing it to stand at room temperature for 6 hours. Thereafter, the pressure was released and the sample was allowed to stand at room temperature for one week to prepare an evaluation sample.

In the evaluation sample, the cured adhesive was discretely arranged in the form of dots as shown in FIG. Each of the hardened adhesives, that is, the first beads 4a that are discretely arranged in the form of dots, is formed into a convex lump having a bulging cross-sectional curve having a circular outer shape and a maximum height of 1. It was 5 mm and the volume was 25.1 mm ³ . As shown in FIG. 1 (b), the first bead 4a has a size in which the honeycomb 1, the upper surface plate 2 and the lower surface plate 3 are joined, and a bulk 10 having a height of 1 mm and a diameter of 4 mm is incorporated. It is. When the total length in the length direction of the side of the cell at the contact portion between the first bead 4a and the honeycomb 1 was measured, the total length at the contact portion between the first bead 4a and the honeycomb 1 was the side of the cell constituting the honeycomb 1 The total length was 21.4%. When the storage elastic modulus E ′ of the adhesive used for the first bead 4a in the tensile mode at a frequency of 1 Hz at 20 ° C. was measured, it was 0.8 GPa. The peeling torque of the evaluation sample after the heat cycle test was 23 N · mm / mm.

Example 2
FIG. 2 is a view for explaining an adhesion structure of an evaluation panel of a honeycomb sandwich panel according to Example 2 of the present invention. FIG. 2A is a cross section of the evaluation panel honeycomb cut by a plane perpendicular to the height direction. 2 is schematically shown from the top surface plate side, and FIG. 2B schematically shows a cross section of the evaluation panel taken along a plane parallel to the height direction.

  The honeycomb 1 was made of an aluminum A3003-H19 material having a foil thickness of 0.076 mm, a cell size of 8 mm on one side, and a height of 30 mm in a rectangular shape of 75 mm (short direction) × 240 mm (longitudinal direction). The honeycomb 1 developed in the direction of 240 mm. The upper surface plate 2 and the lower surface plate 3 were the same as those in Example 1.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, an epoxy-amine curing type two-component mixed epoxy adhesive adjusted to a viscosity of 35000 mPa · s was pumped using a plunger-type pump, mixed with a static mixer, and then mixed with a wiping machine. It apply | coated to the adhesion surface of the face plate 2 and the lower surface board 3 discretely. At this time, the application amount of the adhesive was 127 g / m ² . Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by allowing it to stand at room temperature for 6 hours. Thereafter, the pressure was released and the sample was allowed to stand at room temperature for one week to prepare an evaluation sample.

In the evaluation sample, the cured adhesive was discretely arranged in the form of dots as shown in FIG. Each of the first beads 4b that are discretely arranged in a dot shape is formed into a convex lump having a bulging cross-sectional curve having an elliptical outer shape, a maximum height of 1.3 mm, and a volume of 60. It was 6mm ^3. As shown in FIG. 2 (b), the first bead 4b has a size in which the honeycomb 1 is joined to the upper surface plate 2 and the lower surface plate 3, and a bulk 10 having a height of 1 mm and a diameter of 4 mm is incorporated. It is. A region 11 shown in FIG. 2A is a region in which the bulk 10 is built. When the total length in the length direction of the side of the cell at the contact portion between the first bead 4b and the honeycomb 1 was measured, the total length at the contact portion between the first bead 4b and the honeycomb 1 was the side of the cell constituting the honeycomb 1 17.6% of the total length. The storage elastic modulus E ′ of the adhesive used for the first bead 4b in the tensile mode at a frequency of 1 Hz at 20 ° C. was measured and found to be 0.8 GPa. The peeling torque of the evaluation sample after the heat cycle was 25 N · mm / mm.

Example 3
FIG. 3 is a view for explaining the bonding structure of the evaluation panel of the honeycomb sandwich panel according to Example 3 of the present invention. FIG. 3A is a cross section of the evaluation panel honeycomb cut by a plane orthogonal to the height direction. 3 is schematically shown from the top surface plate side, and FIG. 3B schematically shows a cross section of the evaluation panel taken along a plane parallel to the height direction.

  The honeycomb 1 was made of an aluminum A3003-H19 material having a foil thickness of 0.076 mm, a cell size of 6 mm on a side, and a height of 50 mm in a rectangular shape of 75 mm (short direction) × 240 mm (longitudinal direction). The honeycomb 1 developed in the direction of 240 mm. The upper surface plate 2 and the lower surface plate 3 were the same as those in Example 1.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, an epoxy-amine curing type two-component mixed epoxy adhesive adjusted to a viscosity of 400000 mPa · s was pumped using a plunger-type pump, mixed with a static mixer, and the upper surface plate was mixed with a comb-shaped iron. 2 and the lower surface plate 3 were applied discretely to the bonding surface. At this time, the application amount of the adhesive was 480 g / m ² . Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by allowing it to stand at room temperature for 6 hours. Thereafter, the pressure was released and the sample was allowed to stand at room temperature for one week to prepare an evaluation sample.

In the evaluation sample, the cured adhesive was discretely arranged linearly as shown in FIG. Each of the first beads 4c that are discretely arranged in a linear shape is formed into a convex lump having a bulging cross-sectional curve that has a predetermined width, and has a maximum height of 4.0 mm and a volume of 1800 mm. ³ . As shown in FIG. 3 (b), the first bead 4c has a size in which the honeycomb 1 is joined to the upper surface plate 2 and the lower surface plate 3, and a bulk 10 having a height of 1 mm and a diameter of 4 mm is incorporated. It is. When the total length in the length direction of the cell side at the contact portion between the first bead 4c and the honeycomb 1 was measured, the total length at the contact portion between the first bead 4c and the honeycomb 1 was the side of the cell constituting the honeycomb 1 The total length was 20.2%. When the storage elastic modulus E ′ of the adhesive used in the first bead 4c in the tensile mode at a frequency of 1 Hz at 20 ° C. was measured, it was 1.1 GPa. The peeling torque of the evaluation sample after the heat cycle was 28 N · mm / mm. The volume 1800 mm ³ is a volume with a length of 15 cm.

Example 4
FIG. 4 is a view for explaining the bonding structure of the evaluation panel of the honeycomb sandwich panel according to Example 4 of the present invention, and FIG. 4 is schematically shown as viewed from the upper surface plate side, and FIG. 4B schematically shows a cross section of the evaluation panel taken along a plane parallel to the height direction.

  The honeycomb 1 was made of an aluminum A3003-H19 material having a foil thickness of 0.076 mm, a cell size of 8 mm on one side, and a height of 80 mm, and a rectangular shape of 75 mm (short direction) × 240 mm (longitudinal direction). The honeycomb 1 developed in the direction of 240 mm. The upper surface plate 2 and the lower surface plate 3 were the same as those in Example 1.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, an epoxy-amine curing type two-component mixed epoxy adhesive adjusted to a viscosity of 45000 mPa · s was pumped using a plunger-type pump, mixed with a static mixer, and then mixed with a wiping machine. It apply | coated to the adhesion surface of the face plate 2 and the lower surface board 3 discretely. At this time, the application amount of the adhesive was 146 g / m ² . Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by allowing it to stand at room temperature for 6 hours. Thereafter, the pressure was released and the sample was allowed to stand at room temperature for one week to prepare an evaluation sample.

In the evaluation sample, the cured adhesive was discretely arranged in the form of dots as shown in FIG. Each of the first beads 4d discretely arranged in the form of dots is formed into a convex lump having a bulging cross-sectional curve having a quadrangular outer shape, a maximum height of 1.1 mm, and a volume of 93.8 mm. ³ . As shown in FIG. 4B, the first bead 4d is a size that joins the honeycomb 1, the upper surface plate 2 and the lower surface plate 3, and incorporates a bulk 10 having a height of 1 mm and a diameter of 4 mm. It is. When the total length in the length direction of the side of the cell at the contact portion between the first bead 4d and the honeycomb 1 was measured, the total length at the contact portion between the first bead 4d and the honeycomb 1 was the side of the cell constituting the honeycomb 1 The total length was 10.3%. When the storage elastic modulus E ′ of the adhesive used for the first bead 4d in the tensile mode at a frequency of 1 Hz at 20 ° C. was measured, it was 1.4 GPa. The peeling torque of the evaluation sample after the heat cycle was 25 N · mm / mm.

Example 5 FIG.
FIG. 5 is a view for explaining an adhesion structure of an evaluation panel for a honeycomb sandwich panel according to Example 5 of the present invention. FIG. 5 (a) is a cross section of the evaluation panel honeycomb cut by a plane perpendicular to the height direction. FIG. 5B schematically shows a cross section of the evaluation panel taken along a plane parallel to the height direction.

  The honeycomb 1 was made of an aluminum A3003-H19 material having a foil thickness of 0.076 mm, a cell size of 4 mm on one side, and a height of 80 mm, and was made into a rectangle of 75 mm (short direction) × 240 mm (longitudinal direction). The honeycomb 1 developed in the direction of 240 mm. The upper surface plate 2 and the lower surface plate 3 were the same as those in Example 1.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, a two-component mixed modified acrylate adhesive adjusted to a viscosity of 23000 mPa · s was pumped using an air pressure pump and mixed with a static mixer, and the upper surface plate 2 and the lower plate were mixed using a wiping machine. It applied to the adhesion surface of the surface board 3 discretely. At this time, the application amount of the adhesive was 336 g / m ² . Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by leaving it at room temperature for 3 hours. Thereafter, the pressure was released and the sample was allowed to stand at room temperature for one week to prepare an evaluation sample.

In the evaluation sample, the cured adhesive was discretely arranged in a line as shown in FIG. Each of the first beads 4e that are discretely arranged in a linear shape is formed into a convex lump having a cross-sectional curve of a bulging shape, which has a predetermined width, and has a maximum height of 2.0 mm and a volume of 1260 mm. ³ . As shown in FIG. 5B, the first bead 4e has a size in which the honeycomb 1 is joined to the upper surface plate 2 and the lower surface plate 3, and a bulk 10 having a height of 1 mm and a diameter of 4 mm is incorporated. It is. When the total length in the length direction of the side of the cell at the contact portion between the first bead 4e and the honeycomb 1 was measured, the total length at the contact portion between the first bead 4e and the honeycomb 1 was the side of the cell constituting the honeycomb 1 The total length was 38.0%. When the storage elastic modulus E ′ of the adhesive used for the first bead 4e in the tensile mode at a frequency of 1 Hz at 20 ° C. was measured, it was 0.7 GPa. The peeling torque of the evaluation sample after the heat cycle was 26 N · mm / mm. The volume 1260 mm ³ is a volume at a length of 15 cm.

Example 6
FIG. 6 is a view for explaining the bonding structure of the evaluation panel of the honeycomb sandwich panel according to Example 6 of the present invention. FIG. 6A is a cross section of the evaluation panel honeycomb cut by a plane orthogonal to the height direction. FIG. 6B schematically shows a cross section obtained by cutting the evaluation panel along a plane parallel to the height direction.

  The honeycomb 1 was made of an aluminum A3003-H19 material having a foil thickness of 0.076 mm, a cell size of 6 mm on a side, and a height of 50 mm in a rectangular shape of 75 mm (short direction) × 240 mm (longitudinal direction). The honeycomb 1 developed in the direction of 240 mm. The upper surface plate 2 and the lower surface plate 3 were the same as those in Example 1.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, an epoxy-amine curing type two-component mixed epoxy adhesive adjusted to a viscosity of 35000 mPa · s was pumped using a plunger-type pump, mixed with a static mixer, and the above table was used using a comb-shaped iron. 275 g / m ² is discretely applied linearly to the adhesion surface of the face plate 2 and the lower surface plate 3, and then 44 g discretely in a dot shape on the adhesion surface of the upper surface plate 2 and the lower surface plate 3 by a wiping machine. / M ^{2 was} applied. The total application amount of the adhesive is 319 g / m ² . Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by allowing it to stand at room temperature for 6 hours. Thereafter, the pressure was released and the sample was allowed to stand at room temperature for one week to prepare an evaluation sample.

In the evaluation sample, as shown in FIG. 6A, the cured adhesive has discretely arranged convex lumps having a bulging cross-sectional curve with a circular outer shape in a linear pattern. It was formed in a pattern. Each of the first beads 4f having a circular outer shape of the cured adhesive had a maximum height of 2.5 mm and a volume of 23.6 mm ³ . As shown in FIG. 6B, the first bead 4f is a size in which the honeycomb 1 is joined to the upper surface plate 2 and the lower surface plate 3, and a bulk 10 having a height of 1 mm and a diameter of 4 mm is incorporated. It is. Each of the linear second beads 5a of the cured adhesive had a height of less than 1 mm. An adhesive fillet formed by being pulled by the surface tension of the honeycomb 1 is formed at the intersection of the honeycomb 1 with the second bead 5a. In addition, an adhesive fillet (not shown) formed by being pulled by the surface tension of the honeycomb 1 is formed in a portion of the honeycomb 1 located between the second beads 5a. When the total length in the length direction of the cell side at the contact portion between the first bead 4f and the honeycomb 1 was measured, the total length at the contact portion between the first bead 4f and the honeycomb 1 was the side of the cell constituting the honeycomb 1 It was 12.8% of the total length. The storage elastic modulus E ′ of the adhesive used for the first bead 4f in the tensile mode at a frequency of 1 Hz at 20 ° C. was measured and found to be 0.8 GPa. The peeling torque of the evaluation sample after the heat cycle was 25 N · mm / mm.

Example 7
FIG. 7 is a view for explaining an adhesion structure of an evaluation panel of a honeycomb sandwich panel according to Example 7 of the present invention. FIG. 7A is a cross section of the evaluation panel honeycomb cut along a plane perpendicular to the height direction. FIG. 7B schematically shows a cross section of the evaluation panel taken along a plane parallel to the height direction.

  The honeycomb 1 was made of an aluminum A3003-H19 material having a foil thickness of 0.06 mm, a cell size of 6 mm on one side, and a height of 30 mm, and a rectangular shape of 75 mm (short direction) × 240 mm (longitudinal direction). The honeycomb 1 developed in the direction of 240 mm. The upper surface plate 2 and the lower surface plate 3 were the same as those in Example 1.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, an epoxy-amine curing type two-component mixed epoxy adhesive adjusted to a viscosity of 45000 mPa · s was pumped using a plunger-type pump, mixed with a static mixer, and the above table was used using a comb-shaped iron. 275 g / m ^{2 is} applied discretely in a linear manner to the adhesion surface of the face plate 2 and the lower surface plate 3, and then 95 g in a dotted manner on the adhesion surfaces of the upper surface plate 2 and the lower surface plate 3 by a wiping machine. / M ^{2 was} applied. The total amount of adhesive applied is 370 g / m ² . Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by heating at 70 ° C. for 1 hour. Thereafter, the pressure was released and the sample was allowed to stand at room temperature for one week to prepare an evaluation sample.

In the evaluation sample, as shown in FIG. 7A, the cured adhesive has discretely arranged convex lumps having a bulging cross-sectional curve with a square outer shape in a linear pattern. It was formed in a pattern. Each of the first beads 4g having a rectangular outer shape of the cured adhesive had a maximum height of 2.0 mm and a volume of 48 mm ³ . That is, as shown in FIG. 7B, the first bead 4g joins the honeycomb 1, the upper surface plate 2 and the lower surface plate 3, and has a size in which a bulk 10 having a height of 1 mm and a diameter of 4 mm is incorporated. That's it. Each of the linear second beads 5b of the cured adhesive had a height of less than 1 mm. An adhesive fillet formed by being pulled by the surface tension of the honeycomb 1 is formed at the intersection of the honeycomb 1 with the second bead 5b. In addition, an adhesive fillet (not shown) formed by being pulled by the surface tension of the honeycomb 1 is formed in a portion of the honeycomb 1 located between the second beads 5b. When the total length in the length direction of the side of the cell in the contact portion between the first bead 4g and the honeycomb 1 was measured, the total length in the contact portion between the first bead 4g and the honeycomb 1 was the side of the cell constituting the honeycomb 1 The total length was 11.5%. When the storage elastic modulus E ′ of the adhesive used in the first bead 4 g in the tensile mode at a frequency of 1 Hz at 20 ° C. was measured, it was 1.4 GPa. The peeling torque of the evaluation sample after the heat cycle was 24 N · mm / mm.

Example 8 FIG.
FIG. 8 is a view for explaining the bonding structure of the evaluation panel of the honeycomb sandwich panel according to Example 8 of the present invention. FIG. 8A is a cross section of the evaluation panel honeycomb cut by a plane orthogonal to the height direction. FIG. 8B schematically shows a cross section of the evaluation panel taken along a plane parallel to the height direction, and FIG. 8C is a diagram of FIG. It is AA arrow sectional drawing of 8 (a).

  The honeycomb 1 was made of an aluminum A3003-H19 material having a foil thickness of 0.06 mm, a cell size of 6 mm on one side, and a height of 70 mm in a rectangular shape of 75 mm (short direction) × 240 mm (longitudinal direction). The honeycomb 1 developed in the direction of 240 mm. The upper surface plate 2 and the lower surface plate 3 were the same as those in Example 1.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, a two-component mixed modified acrylate adhesive adjusted to a viscosity of 26000 mPa · s was pumped using an air pressure pump, mixed with a static mixer, and the upper surface plate 2 and lower It apply | coated to the pattern in which the wide linear pattern and the narrow linear pattern were mixed on the adhesion surface of the surface board 3. At this time, the application amount of the wide linear pattern is 166 g / m ² , the application amount of the narrow linear pattern is 288 g / m ² , and the total application amount of the adhesive is 454 g / m ² . there were. Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by allowing it to stand at room temperature for 6 hours. Thereafter, the pressure was released and the sample was allowed to stand at room temperature for one week to prepare an evaluation sample.

In the evaluation sample, the cured adhesive was formed into a pattern in which a wide linear pattern and a narrow linear pattern were mixed, as shown in FIG. Each of the linear first beads 4h having a wide width of the cured adhesive was formed in a convex shape having a bulging cross-sectional curve, and had a maximum height of 1.8 mm and a volume of 1080 mm ³ . As shown in FIG. 8 (b), the first bead 4h has a size in which the honeycomb 1 is joined to the upper surface plate 2 and the lower surface plate 3, and a bulk 10 having a height of 1 mm and a diameter of 4 mm is incorporated. is there. Moreover, the linear second bead 5c having a narrow width of the cured adhesive had a height of less than 1 mm. An adhesive fillet formed by being pulled by the surface tension of the honeycomb 1 is formed at the intersection of the honeycomb 1 with the second bead 5c. Furthermore, as shown in FIG. 8C, an adhesive fillet 6 formed by being pulled by the surface tension of the honeycomb 1 is formed in the portion of the honeycomb located between the second beads 5c. . When the total length in the length direction of the cell side at the contact portion between the first bead 4h and the honeycomb 1 was measured, the total length at the contact portion between the first bead 4h and the honeycomb 1 was the total length of the sides of all the honeycombs. It was 20.5%. The storage elastic modulus E ′ of the adhesive used for the first bead 4h in the tensile mode at a frequency of 1 Hz at 20 ° C. was measured and found to be 0.7 GPa. The peeling torque of the evaluation sample after the heat cycle was 24 N · mm / mm. The volume 1080 mm ³ is a volume at a length of 15 cm.

Comparative Example 1
FIG. 9 is a diagram for explaining the bonding structure of the evaluation panel of the honeycomb sandwich panel of Comparative Example 1, and FIG. 9A shows a cross section of the evaluation panel honeycomb cut by a plane perpendicular to the height direction. The state seen from the side is schematically shown, and FIG. 9B schematically shows a cross section obtained by cutting the evaluation panel along a plane parallel to the height direction.

  The honeycomb 1 was made of an aluminum A3003-H19 material having a foil thickness of 0.06 mm, a cell size of 6 mm on one side, and a height of 70 mm in a rectangular shape of 75 mm (short direction) × 240 mm (longitudinal direction). The honeycomb 1 developed in the direction of 240 mm. The upper surface plate 2 and the lower surface plate 3 were the same as those in Example 1.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, an epoxy-amine curing type two-component mixed epoxy adhesive adjusted to a viscosity of 35000 mPa · s was pumped using a plunger-type pump, mixed with a static mixer, and the above table was used using a comb-shaped iron. It applied to the adhesion surface of the face plate 2 and the lower surface board 3 discretely and linearly. At this time, the application amount of the adhesive was 285 g / m ² . Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by allowing it to stand at room temperature for 6 hours. Thereafter, the pressure was released and the sample was allowed to stand at room temperature for one week to prepare an evaluation sample.

In the evaluation sample, the cured adhesive was discretely arranged in a line as shown in FIG. Each of the second beads 5d discretely arranged in a linear shape was formed into a linear lump having a predetermined width, and had a maximum height of 0.9 mm and a volume of 202 mm ³ . In the region of the honeycomb 1 in contact with the second bead 5d, an adhesive fillet formed by being pulled by the surface tension of the honeycomb 1 is formed as shown in FIG. 9B. The storage elastic modulus E ′ of the adhesive used for the second bead 5d in the tensile mode at a frequency of 1 Hz at 20 ° C. was measured and found to be 0.8 GPa. The peeling torque of the evaluation sample after the heat cycle was 9 N · mm / mm.

Comparative Example 2
FIG. 10 is a view for explaining the bonding structure of the evaluation panel of the honeycomb sandwich panel of Comparative Example 2, and FIG. 10 (a) shows the cross section of the evaluation panel honeycomb cut by a plane perpendicular to the height direction. The state seen from the side is schematically shown, and FIG. 10B schematically shows a cross section of the evaluation panel taken along a plane parallel to the height direction.

  The honeycomb 1 was made of an aluminum A3003-H19 material having a foil thickness of 0.076 mm, a cell size of 6 mm on one side, and a height of 60 mm in a rectangular shape of 75 mm (short direction) × 240 mm (longitudinal direction). The honeycomb 1 developed in the direction of 240 mm. The upper surface plate 2 and the lower surface plate 3 were the same as those in Example 1.

The upper surface plate 1 and the lower surface plate 2 were mechanically polished on the bonding surfaces and then washed with acetone. Next, an epoxy-amine curing type two-component mixed epoxy adhesive adjusted to a viscosity of 35000 mPa · s was pumped using a plunger-type pump, mixed with a static mixer, and the above table using a flat spatula. It apply | coated to the whole adhesive surface of the face plate 2 and the lower surface board 3 in uniform thickness. At this time, the application amount of the adhesive was 1650 g / m ² . Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by heating at 70 ° C. for 1 hour. Thereafter, the pressure was released and the sample was allowed to stand at room temperature for one week to prepare an evaluation sample.

In the evaluation sample, the cured adhesive layer 8 has a maximum height of 1.5 mm and a volume that covers the entire surface of the upper surface plate 2 and the lower surface plate 3 as shown in FIGS. It was formed in a layered form of 150,000 mm ³ or more. When the storage elastic modulus E ′ of the adhesive used for the cured adhesive layer 8 in the tensile mode at a frequency of 1 Hz at 20 ° C. was measured, it was 0.8 GPa. The peeling torque of the evaluation sample after the heat cycle was 12 N · mm / mm.

Comparative Example 3
FIG. 11 is a diagram for explaining an adhesion structure of an evaluation panel of a honeycomb sandwich panel according to Comparative Example 3 of the present invention. FIG. 11A is a cross section of the evaluation panel honeycomb cut by a plane perpendicular to the height direction. FIG. 11B schematically shows a cross section of the evaluation panel taken along a plane parallel to the height direction.

  The honeycomb 1 was made of an aluminum A3003-H19 material having a foil thickness of 0.076 mm, a cell size of 8 mm on one side, and a height of 30 mm in a rectangular shape of 75 mm (short direction) × 240 mm (longitudinal direction). The honeycomb 1 developed in the direction of 240 mm. The upper surface plate 2 and the lower surface plate 3 were the same as those in Example 1.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, an epoxy-amine curing type two-component mixed epoxy adhesive adjusted to a viscosity of 35000 mPa · s was pumped using a plunger-type pump, mixed with a static mixer, and then mixed with a wiping machine. It apply | coated to the adhesion surface of the face plate 2 and the lower surface board 3 discretely. At this time, the application amount of the adhesive was 63 g / m ² . Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by allowing it to stand at room temperature for 6 hours. Thereafter, the pressure was released and the sample was allowed to stand at room temperature for one week to prepare an evaluation sample.

In the evaluation sample, the cured adhesive was discretely arranged in a dot shape as shown in FIG. Each of the first beads 4i that are discretely arranged in a dot shape is formed into a lump having an outer shape of an ellipse, and has a maximum height of 1.4 mm and a volume of 65.0 mm ³ . As shown in FIG. 11 (b), the first bead 4i is a size in which the honeycomb 1, the upper surface plate 2 and the lower surface plate 3 are joined, and a bulk 10 having a height of 1 mm and a diameter of 4 mm is incorporated. It is. When the total length in the length direction of the side of the cell at the contact portion between the first bead 4i and the honeycomb 1 was measured, the total length at the contact portion between the first bead 4i and the honeycomb 1 was the side of the cell constituting the honeycomb 1 Was 9.5% of the total length. The storage elastic modulus E ′ of the adhesive used for the first bead 4i in the tensile mode at a frequency of 1 Hz at 20 ° C. was measured and found to be 0.8 GPa. The peeling torque of the evaluation sample after the heat cycle was 10 N · mm / mm.

Comparative Example 4
FIG. 12 is a view for explaining the bonding structure of the evaluation panel of the honeycomb sandwich panel according to Comparative Example 4 of the present invention. FIG. 12 (a) is a cross section of the evaluation panel honeycomb cut by a plane orthogonal to the height direction. FIG. 12B schematically shows a cross section of the evaluation panel taken along a plane parallel to the height direction.

  The honeycomb 1 was made of an aluminum A3003-H19 material having a foil thickness of 0.1 mm, a cell size of 10 mm on one side, and a height of 100 mm, and was made into a rectangle of 75 mm (short direction) × 240 mm (longitudinal direction). The honeycomb 1 developed in the direction of 240 mm. The upper surface plate 2 and the lower surface plate 3 were the same as those in Example 1.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, an epoxy-amine curing type two-component mixed epoxy adhesive adjusted to a viscosity of 45000 mPa · s was pumped using a plunger-type pump, mixed with a static mixer, and then mixed with a wiping machine. It apply | coated to the adhesion surface of the face plate 2 and the lower surface board 3 discretely. At this time, the application amount of the adhesive was 147 g / m ² . Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by allowing it to stand at room temperature for 6 hours. Thereafter, the pressure was released and the sample was allowed to stand at room temperature for one week to prepare an evaluation sample.

In the evaluation sample, the cured adhesive was discretely arranged in a dot shape as shown in FIG. Each of the first beads 4j arranged discretely in a dot shape was formed in a lump having a triangular outer shape, and had a maximum height of 1.8 mm and a volume of 93.8 mm ³ . As shown in FIG. 12 (b), the first bead 4j joins the honeycomb 1, the upper surface plate 2 and the lower surface plate 3, and incorporates a bulk 10 having a height of 1 mm or more and a diameter of 4 mm or more. It is a size. When the total length in the length direction of the side of the cell at the contact portion between the first bead 4j and the honeycomb 1 was measured, the total length at the contact portion between the first bead 4j and the honeycomb 1 was the side of the cell constituting the honeycomb 1 It was 6.7% of the total length. When the storage elastic modulus E ′ of the adhesive used for the first bead 4j in the tensile mode at a frequency of 1 Hz at 20 ° C. was measured, it was 1.4 GPa. The peeling torque of the evaluation sample after the heat cycle was 14 N · mm / mm.

  Here, the result of an Example and a comparative example is examined.

  From the results of Example 3 and Comparative Example 1, it was found that in Comparative Example 1, the peeling torque after the heat cycle was remarkably reduced as compared with Example 3. This is because, in the case of Comparative Example 1, the hardened adhesive lump, that is, the second bead 5d is formed in such a size that the bulk 10 having a height of 1 mm and a diameter of 4 mm cannot be incorporated, and the volume of the second bead 5d is small. It is presumed that thermal oxidation caused the resin to become brittle and the peel torque decreased. In Comparative Example 1, since the fillet is formed by being pulled by the surface tension of the honeycomb 1, the thickness of the adhesive at the end of the second bead 5d is thin. Therefore, it is presumed that due to the heat cycle, stress is concentrated on the end of the second bead 5d to cause peeling, and the peeling torque is reduced. On the other hand, in Example 3, since the first bead 4a is formed in a size that incorporates the bulk 10 having a height of 1 mm and a diameter of 4 mm, the resistance against thermal oxidation is increased, and the resin portion inside the bead is brittle. It is presumed that the predetermined peeling torque is secured. Furthermore, since the first bead 4a is formed in a convex shape having a bulging cross-sectional curve, the thickness of the adhesive at the end of the first bead 4a is increased. Therefore, it is presumed that the stress concentration at the end of the first bead 4a due to the heat cycle is relaxed and a predetermined peeling torque is secured.

From the results of Example 2 and Comparative Example 3, the number of beads, that is, the amount of adhesive applied, is 100 g / mm ² even if the beads are formed to have a size capable of containing a bulk 10 having a height of 1 mm and a diameter of 4 mm. It was confirmed that the peeling torque after the heat cycle was reduced when the ratio was less than 1.

  From the results of Example 3 and Comparative Example 2, it was found that when the adhesive was thickly spread and cured, the peeling torque after the heat cycle was significantly reduced. This is because the resistance against thermal oxidation increases when the height of the cured adhesive layer is 1 mm or more, but if a crack is formed in a part during cooling, the cured adhesive layer and the adhesive interface It is presumed that the spread torque became smaller and the peel torque became smaller. On the other hand, in Example 3, since the beads are discretely arranged, even if a crack enters one bead, the crack does not spread to other beads, and a predetermined peeling torque is secured. It is inferred.

From the results of Examples 1 to 8 and Comparative Example 4, the length of the contact portion between the bead and the honeycomb 1 having a height of 1 mm and a diameter of 4 mm in which the bulk 10 can be incorporated is determined as the side of the cell constituting the honeycomb 1. It was confirmed that the peeling torque after the heat cycle was 20 N · mm / mm or more by setting the total length to 10% or more. Also, with a small adhesive application amount of 127 g / m ² to 454 g / m ^{2, it} is possible to achieve a peeling torque after a heat cycle of 20 N · mm / mm or more, which is very useful for reducing the amount of adhesive used. I found out that

  In the evaluation samples of Examples 1 to 8, the peeling torque after the heat cycle showed a value of 20 N · mm / mm or more. In other words, it was confirmed that the durability was ensured regardless of the shape and arrangement of the beads if the beads were sized so as to contain the bulk 10 having a height of 1 mm and a diameter of 4 mm and arranged in a discrete manner. .

  In Examples 3 and 8, since the adhesive is applied using a comb-shaped trowel, the cross-sectional shape of the adhesive after the application is affected by the history of the groove of the comb-shaped trowel, and the cured adhesive The shape, that is, the dimensional accuracy of the bead could be improved. On the other hand, in Examples 1, 2, 4 and 5, since the adhesive is dropped and applied by a predetermined amount by a wiping machine, it is easy to apply the adhesive. It was difficult to improve the shape, that is, the dimensional accuracy of the beads. Therefore, in consideration of the shape stability of the bead, it is desirable to apply the adhesive using a comb iron.

  From the result of Comparative Example 1, it was confirmed that the beads do not contribute to the durability improvement in the case where the bead has a size not including the bulk 10 having a height of 1 mm and a diameter of 4 mm. This durability is relative to the peeling torque in the climbing drum peel. However, even a bead with a low height that does not contribute to durability in the climbing drum peel can contribute to increasing the bending rigidity of the panel itself. Therefore, from the viewpoint of increasing the bending rigidity, it is desirable to mix a bead having a size with a built-in bulk 10 having a height of 1 mm and a diameter of 4 mm and a bead having a size not having a built-in bulk 10 having a height of 1 mm and a diameter of 4 mm. In view of the shape stability of the bead, it is more desirable to adopt the form of Example 8.

  Next, a case where the present honeycomb sandwich panel is applied to an elevator car floor material will be described.

Example 9
FIG. 13 is a view for explaining the bonding structure of a honeycomb sandwich panel according to Embodiment 9 of the present invention. FIG. 13 (a) is a cross-sectional view of the honeycomb sandwich panel cut along a plane perpendicular to the height direction. FIG. 13B schematically shows a cross section of the honeycomb sandwich panel cut by a plane parallel to the height direction, as viewed from the surface plate side. FIG. 14 is a schematic view showing a groove shape of a comb-shaped iron used for applying an adhesive.

  In FIG. 13, the honeycomb 1 is made of aluminum A3003-H19, having a foil thickness of 0.1 mm, a cell size of 10 mm on one side, and a height of 30 mm, is formed into a rectangle of 720 mm (short direction) × 1400 mm (longitudinal direction). Produced. The honeycomb 1 developed in the direction of 1400 mm. The lower surface plate 3 was made of aluminum A5052-H34 and formed into a flat plate of 720 mm × 1400 mm × 1 mm. The upper surface plate 2 was made of aluminum A5052-H34 and formed into a flat plate of 720 mm × 1400 mm × 2 mm.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, a two-component mixed modified acrylate adhesive adjusted to a viscosity of 26000 mPa · s was pumped using an air pressure pump and mixed with a static mixer, and the comb stitch shown in FIG. 15 was applied to a pattern in which a wide linear pattern and a narrow linear pattern were mixed on the bonding surface of the upper surface plate 2 and the lower surface plate 3. At this time, the total application amount of the adhesive was 450 g / m ² . The total length of the contact portion between the first bead 4 and the honeycomb 1 was 31.8% of the total length of the sides of the cells constituting the honeycomb 1.

  Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by allowing it to stand at room temperature for 6 hours. Thereafter, the pressure was released and the mixture was allowed to stand at room temperature for a week to produce a large honeycomb sandwich panel 100.

In the honeycomb sandwich panel 100 manufactured in this way, the cured adhesive has a pattern in which a wide linear pattern and a narrow linear pattern are mixed, as shown in FIG. Is formed. Each of the linear first beads 4 having a wide width of the cured adhesive was formed in a convex shape having a bulging cross-sectional curve, and had a maximum height of 1.8 mm and a volume of 1080 mm ³ . As shown in FIG. 13B, the first bead 4 is a size in which the honeycomb 1 is bonded to the upper surface plate 2 and the lower surface plate 3, and the bulk 10 having a height of 1 mm and a diameter of 4 mm is incorporated. there were. Moreover, the linear second bead 5 having a narrow width of the cured adhesive had a height of less than 1 mm. The storage elastic modulus E ′ of the adhesive used for the first bead 4 in the tensile mode at a frequency of 1 Hz at 20 ° C. is 0.7 GPa.

  This honeycomb sandwich panel 100 has an adhesive structure equivalent to that of Example 8, and has excellent durability applicable to elevator car flooring.

  The present invention may be utilized for enhancing durability by selecting a portion where a load is easily applied in the honeycomb sandwich panel.

Example 10
FIG. 15 is a view for explaining the bonding structure of a honeycomb sandwich panel according to Example 10 of the present invention. FIG. 15 (a) is a cross-sectional view of the honeycomb sandwich panel cut along a plane perpendicular to the height direction. FIG. 15 (b) schematically shows a cross section of the central portion of the honeycomb sandwich panel taken along a plane parallel to the height direction, and FIG. 15 (c) shows the state viewed from the surface plate side. Shows schematically a cross section of a peripheral portion of the honeycomb sandwich panel cut by a plane parallel to the height direction.

  In FIG. 15, the honeycomb 1 is made of aluminum A3003-H19, having a foil thickness of 0.1 mm, a cell size of 10 mm on one side, and a height of 50 mm, is formed into a rectangle of 720 mm (short direction) × 1400 mm (longitudinal direction). Produced. The honeycomb 1 developed in the direction of 1400 mm. The lower surface plate 3 was made of aluminum A5052-H34 and formed into a flat plate of 720 mm × 1400 mm × 1 mm. The upper surface plate 2 was made of aluminum A5052-H34 and formed into a flat plate of 720 mm × 1400 mm × 2 mm.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, a two-component mixed modified acrylate adhesive adjusted to a viscosity of 26000 mPa · s was applied to the center part of the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3 with a comb-like iron shown in FIG. 16 is further applied to the peripheral portion surrounding the central portions of the bonding surfaces of the upper surface plate 2 and the lower surface plate 3 by using a comb iron 15 shown in FIG. The total amount of adhesive applied is 350 g / m ² . The total length of the contact portion between the first bead 4 and the honeycomb 1 was 17.7% of the total length of the sides of the cells constituting the honeycomb 1.

  Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by allowing it to stand at room temperature for 6 hours. Thereafter, the pressure was released, and the mixture was allowed to stand at room temperature for a week to produce a large honeycomb sandwich panel 101.

In the honeycomb sandwich panel 101 manufactured in this way, the cured adhesive is formed in a linear pattern with a narrow center part and a peripheral part surrounding the center part as shown in FIG. It is formed in a pattern in which a wide linear pattern and a narrow linear pattern are mixed. Each of the linear first beads 4 having a wide width of the cured adhesive was formed in a convex shape having a bulging cross-sectional curve, and had a maximum height of 1.8 mm and a volume of 1080 mm ³ . As shown in FIG. 15 (c), the first bead 4 is a size in which the honeycomb 1 is bonded to the upper surface plate 2 and the lower surface plate 3 and a bulk 10 having a height of 1 mm and a diameter of 4 mm is incorporated. there were. Moreover, the linear second bead 5 having a narrow width of the cured adhesive had a height of less than 1 mm. And in the area | region which contact | connects the 2nd bead 5 of the honeycomb 1, as shown in FIG.15 (b), the fillet of the adhesive agent formed by being pulled by the surface tension of the honeycomb 1 is formed. The storage elastic modulus E ′ of the adhesive used for the first bead 4 in the tensile mode at a frequency of 1 Hz at 20 ° C. is 0.7 GPa.

  In the tenth embodiment, as shown in FIG. 15, the first beads 4 are discretely arranged in the peripheral portion surrounding the central portions of the upper surface plate 2 and the lower surface plate 3, so that the load is applied to the peripheral portion. It is suitable for the use of a car floor material of a biased car.

Example 11
FIG. 16 is a view for explaining the bonding structure of a honeycomb sandwich panel according to Example 11 of the present invention. FIG. 16 (a) is a cross-sectional view of the honeycomb sandwich panel cut along a plane perpendicular to the height direction. FIG. 16B schematically shows a state of the peripheral portion of the honeycomb sandwich panel taken along a plane parallel to the height direction, and FIG. 16C shows the state viewed from the surface plate side. Fig. 4 schematically shows a cross section of a central portion of the honeycomb sandwich panel cut by a plane parallel to the height direction.

  In FIG. 16, the honeycomb 1 is made of aluminum A3003-H19, having a foil thickness of 0.1 mm, a cell size of 10 mm on one side, and a height of 80 mm, is formed into a rectangle of 720 mm (short direction) × 1400 mm (longitudinal direction). Produced. The honeycomb 1 developed in the direction of 1400 mm. The lower surface plate 3 was made of aluminum A5052-H34 and formed into a flat plate of 720 mm × 1400 mm × 1 mm. The upper surface plate 2 was made of aluminum A5052-H34 and formed into a flat plate of 720 mm × 1400 mm × 2 mm.

The upper surface plate 2 and the lower surface plate 3 were mechanically polished on the bonding surfaces and then washed with acetone. Next, a two-component mixed type modified acrylate adhesive adjusted to a viscosity of 26000 mPa · s was applied to the center part of the bonding surface of the upper surface plate 2 and the lower surface plate 3 with a comb-like iron shown in FIG. 15 is applied to the peripheral portion surrounding the central portion of the bonding surface of the upper surface plate 2 and the lower surface plate 3 by using a comb-shaped iron 16 shown in FIG. The total amount of adhesive applied is 322 g / m ² . The total length of the contact portion between the first bead 4 and the honeycomb 1 was 14.4% of the total length of all the honeycomb sides.

  Next, the honeycomb 1 is sandwiched between the adhesive surfaces of the upper surface plate 2 and the lower surface plate 3, and the laminate is evacuated using a polyethylene sheet with the lower surface plate 3 facing downward, and is pressurized at 0.07 MPa, The adhesive was cured by allowing it to stand at room temperature for 6 hours. Thereafter, the pressure was released, and the mixture was allowed to stand at room temperature for a week to produce a large honeycomb sandwich panel 102.

In the honeycomb sandwich panel 102 manufactured in this way, the cured adhesive has a mixture of a wide linear pattern and a narrow linear pattern at the center as shown in FIG. It is formed in a pattern, and the peripheral part surrounding the central part is formed in a narrow linear pattern. Each of the linear first beads 4 having a wide width of the cured adhesive was formed in a convex shape having a bulging cross-sectional curve, and had a maximum height of 1.8 mm and a volume of 1080 mm ³ . As shown in FIG. 16C, the first bead 4 is a size in which the honeycomb 1 is joined to the upper surface plate 2 and the lower surface plate 3, and the bulk 10 having a height of 1 mm and a diameter of 4 mm is incorporated. there were. Moreover, the linear second bead 5 having a narrow width of the cured adhesive had a height of less than 1 mm. And in the area | region which contact | connects the 2nd bead 5 of the honeycomb 1, as shown in FIG.16 (b), the fillet of the adhesive agent formed by being pulled by the surface tension of the honeycomb 1 is formed. The storage elastic modulus E ′ of the adhesive used for the first bead 4 in the tensile mode at a frequency of 1 Hz at 20 ° C. is 0.7 GPa.

  In the eleventh embodiment, as shown in FIG. 16, the first beads 4 are discretely arranged at the central portions of the upper surface plate 2 and the lower surface plate 3, so that the load is biased toward the central portion. It is suitable for the use of a car flooring of a car.

  DESCRIPTION OF SYMBOLS 1 Honeycomb, 2 Upper surface board, 3 Lower surface board, 4, 4a-4h 1st bead, 5, 5a-5c 2nd bead, 7 Resin part (2nd bead), 10 Bulk, 100, 101, 102 Honeycomb sandwich panel.

Claims (5)

A honeycomb sandwich panel comprising a honeycomb and a pair of surface plates arranged so as to sandwich the honeycomb, wherein the honeycomb and the surface plate are bonded and fixed with an adhesive,
The adhesive is an adhesive having a storage elastic modulus after curing at 20 ° C. of 100 MPa or more,
A convex first bead having a bulging cross-sectional curve containing a bulk of at least 1 mm in height and 4 mm in diameter formed by applying and curing the adhesive on the adhesive surface of the surface plate is discrete. Placed in
The honeycomb and the surface plate are bonded and fixed by the first bead ,
The total length of the longitudinal sides of the cells in the contact portion between the first bead and the honeycomb is 10% or more of the total length of the edges of the cells constituting the honeycomb, characterized in der Rukoto 50% Honeycomb sandwich panel. 2. The honeycomb according to claim 1 , wherein the first beads are formed in a linear pattern, and are arranged on a bonding surface of the surface plate by being arranged at a predetermined pitch in a width direction of the linear pattern. Sandwich panel. The second bead is less than the height of the adhesive is formed on the linear pattern is cured 1mm is, according to claim 2, characterized in that it is arranged at least one strip between adjacent said first bead Honeycomb sandwich panel. The honeycomb sandwich panel according to any one of claims 1 to 3 , wherein the honeycomb is made of an aluminum alloy. An elevator car comprising the honeycomb sandwich panel according to any one of claims 1 to 4 as a car flooring.

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