JP2019093653A - Laminate - Google Patents

Abstract

To provide a laminate which can suppress warpage and deformation and the like even when one metal sheet material is thinned in front and rear metal sheet materials.SOLUTION: A laminate includes: a resin sheet material 20; a first metal sheet material 10 which is joined to one surface of the resin sheet material 20 and is made of aluminum or an aluminum alloy; a cardboard 30 joined to the other surface of the resin sheet material 20; and a second metal sheet material 40 which is joined to the cardboard 30 and is made of aluminum or an aluminum alloy thinner than the first metal sheet material 10. The cardboard 30 has Taber stiffness of 20-80 mN m and is a single layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminate used mainly for interior materials such as ceiling materials and wall materials.

  Generally, the laminated body which joined the metal sheet to both surfaces of the synthetic resin sheet | seat was used as interior materials, such as a roof material and an inner wall material. Such a laminate is cheaper and lighter than the case of using a single metal plate, is excellent in workability such as cutting, and is further excellent in bending strength and the like.

  In such a laminate, if the metal sheets on both sides are different types of material or the same material, the laminate is likely to warp due to temperature change, so the same material is generally used. Often substantially the same material is used, such as the same thickness.

For example, when titanium is used as the metal sheet, the corrosion resistance is excellent. However, since titanium is expensive, it is disclosed in Patent Document 1 that a titanium plate is formed on one side of the resin sheet and 20 to the other side. There is disclosed a metal-resin composite plate formed by bonding stainless steel plates having a thermal expansion coefficient of 11 × 10 ⁻⁶ / ° C. or less at 100 ° C., respectively. As described above, even if the metal sheets on both sides are different types of materials, warpage and deformation can be suppressed by using a material having specific physical properties.

Unexamined-Japanese-Patent No. 09-195518

  By the way, when using the metal-resin composite board of patent document 1 as an interior material, since there are many uses of a decorative material in which an installation place is attached to a ceiling surface, a wall surface, etc., the smoothness or strength of the decorative surface side facing indoor side A metal sheet is necessary when considering etc. However, the metal sheet is not always necessary on the ceiling or wall side of the mounting surface, but rather it is easy to follow the uneven surface to a certain extent when the mounting surface is considered uneven or the like It is preferable that it is a material, and in addition, what can suppress a curvature, a deformation | transformation, etc. was calculated | required.

  Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a laminate capable of suppressing warpage, deformation and the like even if one of the metal sheet materials in the metal sheet material on the front and back is made thinner. is there.

  In order to solve the above problems, as a result of intensive research conducted by the present inventor, in general, in a laminate in which a metal sheet material, a resin sheet material and a metal sheet material are joined, when one metal sheet material is made thinner, Although warping occurs due to cold heat at the time of molding or subsequent cooling, it has been found that warpage can be suppressed by arranging a thick paper having a predetermined thickness and strength between the resin sheet material and the thin metal sheet material, so that the cold heat cycle is repeated. It has been found that almost no occurrence of warpage occurs due to the above, and the present invention has been completed.

  That is, the laminate according to the present invention comprises a resin sheet material, a first metal sheet material made of aluminum or aluminum alloy joined to one surface of the resin sheet material, and the other surface of the resin sheet material. And a second metal sheet material made of aluminum or an aluminum alloy which is bonded to the opposite side of the thick sheet and is made opposite to the resin sheet material of the thick sheet and which is thinner than the first metal sheet material; Is 20 to 80 mN · m, and is a single layer.

  In the present invention, the thickness of the first metal sheet material is preferably 0.05 to 0.3 mm.

  According to the present invention, warpage, deformation and the like can be suppressed even if the metal sheets on both sides have different thicknesses.

BRIEF DESCRIPTION OF THE DRAWINGS The laminated body which concerns on this invention WHEREIN: It is a schematic diagram which shows one Embodiment.

  Next, the best mode for carrying out the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a schematic view showing an embodiment of a laminate according to the present invention. As shown in FIG. 1, a laminate P according to the present invention comprises a first metal sheet material 10, a resin sheet material 20, a thick paper 30, and a second metal sheet material 40.

  The first metal sheet material 10 is made of aluminum or an aluminum alloy, and is joined to one surface of the resin sheet material 20. In this embodiment, a primer layer (not shown) is provided on the resin sheet material 20 side, and the bonding strength with the resin sheet material 20 can be enhanced. Moreover, it is an opposite side to the resin sheet material 20, Comprising: The surface which hits the surface of the laminated body P is equipped with the decorative layer (not shown) which consists of synthetic resins in this form. The kind and color of the synthetic resin forming the decorative layer can be appropriately selected according to the installation place. Moreover, in order to increase the bonding strength between the first metal sheet material 10 and the decorative layer, an intermediate layer may be further provided. The thickness of the first metal sheet material 10 is preferably 0.05 to 1 mm, more preferably 0.1 to 0.5 mm, in consideration of moldability, strength, handleability, and the like.

  The first metal sheet material 10 is bonded to one surface of the resin sheet material 20, and a thick paper 30 described later is bonded to the other surface. The resin sheet material 20 is made of a thermoplastic resin, and examples thereof include easily molded resins such as polyolefins such as polyethylene and polypropylene. Further, both surfaces of the resin sheet material 20 are bonded to the first metal sheet material 10 and the thick paper 30 via an adhesive layer (not shown).

  The synthetic resin used in the resin sheet material 20 is not limited to this embodiment, and for example, polybutene, polybutene, polyisoprene, polymethylpentene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-α -An olefin copolymer, an ethylene-ethyl acrylate copolymer, an ethylene-unsaturated carboxylic acid copolymer metal neutralization product etc., or the mixture of 2 or more types of them etc. can be used suitably.

  In general, since the first metal sheet material 10 and the resin sheet material 20 have large thermal expansion coefficients, it is more preferable to be able to suppress the influence of the thermal expansion coefficient. For example, by using a foamed resin sheet material 20, it is possible to relieve the stress generated in thermal expansion and contraction. Further, the resin sheet material 20 contains an aggregate such as calcium carbonate, aluminum hydroxide, magnesium hydroxide or the like to lower the coefficient of thermal expansion, and the difference in coefficient of thermal expansion with the first metal sheet material 10 Can be made smaller.

  In the thick paper 30, the resin sheet material 20 is joined to one surface, and the second metal sheet material 40 is joined to the other surface. The type of cardboard 30 is preferably a so-called stiff material such as cardboard for paper tubes, and specifically, its strength can be represented by a physical property value called Taber stiffness. Taber stiffness is a value calculated based on JIS P8125, and is expressed by a bending moment required to bend to a specific angle, and indicates that the larger the value, the stronger the material.

  As the thick paper 30, if there is no stiffness, warping occurs when the laminate is prepared, but warp may occur even if the stiffness is too strong. The Taber stiffness of the thick paper 30 is preferably 20 to 80 mN · m.

  The second metal sheet material 40 is aluminum or an aluminum alloy, and is joined to the surface of the thick paper 30 opposite to the resin sheet material 20. In this embodiment, it is bonded to the cardboard 30 via an adhesive layer made of an adhesive. When the second metal sheet member 40 is disposed on the ceiling surface side or the wall surface side when the laminate P is attached to the ceiling surface or the wall surface, the second metal sheet material 40 is as thin as possible within a range in which the laminate P does not generate warpage. However, while being able to aim at the weight reduction of the laminated body P, cost can also be reduced. The thickness is preferably thinner than the first metal sheet material 10, and preferably less than 0.05 mm.

Example 1
Adhesive having a thickness of 0.1 mm and having a primer layer on the side facing the resin sheet material 20 side of a JIS series 3000 aluminum alloy of 0.1 mm thickness, adhesive of 50 μm thickness made of maleic acid-modified polyethylene As a resin sheet material 20, a foamed polyethylene sheet mainly composed of HDPE of 3 mm in thickness and a specific gravity of 0.5, an adhesive sheet of 50 μm in thickness composed of maleic acid modified polyethylene, for a paper tube of 0.5 mm in thickness as a thick paper 30 A thick paper (made by Nippon Paper Industries Co., Ltd., product number: FNN-B1), a 50 μm thick adhesive sheet made of maleic acid-modified polyethylene, and a 0.007 mm JIS 1N30 aluminum foil as a second metal sheet 40 the laminated in this order, 190 ° C. by a heat pressing machine, 10kg / ^cm 2, bonding the respective members in 3 minutes conditions Te to obtain a test piece formed of a laminate of a thickness of 4mm at 10cm square.

[Evaluation of warpage]
Evaluation of warpage was performed on the obtained test pieces. The same evaluation of warpage was carried out for each of the examples and comparative examples described below. As a specific evaluation method, after preparing a test piece, curing was performed at room temperature for 24 hours, and the occurrence of warpage was confirmed. When warping occurs, the central portion on the first metal sheet 10 side may be recessed or the central portion on the second metal sheet 40 side may be recessed. The sample is placed on a reference flat plate having a flat surface with the surface side down, and the gap between the reference flat plate and the recessed surface is measured, evaluated based on the following criteria, and the evaluation results are shown in Table 1 or Table 2. It described in the column of [after test piece preparation] of [evaluation of curvature]. In addition, when generation | occurrence | production of curvature was confusing, the 1st metal sheet 10 side and the 2nd metal sheet 40 side were made into the lower side, respectively, and the clearance gap was measured.
In the case where the first metal sheet 10 side and the second metal sheet 40 side are respectively placed on the reference flat plate with the lower side, the maximum value of the gap is 1 mm or less for all. When the maximum value of the gap exceeds 1 mm at any one of the metal sheet 10 side and the second metal sheet 40 side, when placed on the reference flat plate with each side down

  Subsequently, the warpage after the cooling and heating test was evaluated. Specifically, the test piece is put in an atmosphere of -20 ° C. to 80 ° C. (relative humidity 65% RH) in a greenhouse degree condition, taken out after 5 cycles, and aged at room temperature for 24 hours, as described above The maximum dimension of the gap was measured and evaluated based on the same criteria as described above, and the evaluation results were described in the column of [after the cold heat repeat test] in [Evaluation of warp] in Table 1 or Table 2.

(Note 1) A material used for forming a laminate, and the thickness also indicates the thickness of each material before forming a formed body.
(Note 2) The resin sheet described in the column of Example 1.
(Note 3) The resin sheet described in the column of Example 4.

[Measurement of Taber stiffness]
The Taber stiffness of the members of each material constituting each test piece was measured. Taber stiffness was measured based on JIS JIS P8125. The measurement results are shown in Table 3.

(Note 4) The cardboard described in the column of Comparative Example 4.
(Note 5) The thick paper described in the column of Comparative Example 5.
(Note 6) The thick paper described in the column of Comparative Example 7.
(Note 7) The cardboard described in the column of Comparative Example 8.

Example 2
The same material as in Example 1 except that the first metal sheet material 10 used was a 0.2 mm thick JIS series 3000 series aluminum alloy resin sheet material 20 facing the resin sheet material 20 side. The respective materials were joined using a heat press at 190 ° C. and 10 kg / cm ² for 3 minutes in a heat press machine to obtain a 10 mm square test piece having a thickness of 4 mm.

[Example 3]
The same material as in Example 1 was used at 190 ° C. with a heat press machine, except that a thick paper for paper tubes of 1 mm in thickness (manufactured by Nippon Paper Tube Industry Co., Ltd., product number: FNN-NC) was used as the thick paper 30. Each material was joined on 10 kg / cm < ² > and 3 minutes conditions, and the test piece of thickness 4 mm was obtained by 10 cm square.

Example 4
A heat press machine was prepared using the same material as in Example 1, except that a mixture obtained by extruding a mixture of polyethylene and magnesium hydroxide at 30:70 into a thickness of 3 mm was used as the resin sheet material 20. The respective materials were joined under the conditions of 190 ° C. and 10 kg / cm ² for 3 minutes to obtain a 10 mm square test piece with a thickness of 4 mm.

[Example 5]
As the first metal sheet 10, using a primer having a thickness of 0.2 mm and a primer layer on the side facing the resin sheet 20 of a 3000 series aluminum alloy of JIS designation JIS, for a thick paper 30 with a thickness of 1 mm Conditions of 190 ° C., 10 kg / cm ² , 3 minutes in a heat press using the same material as in Example 1 except that the thick paper (manufactured by Nippon Paper Industries Co., Ltd., product number: FNN-NC) was used The respective materials were joined together to obtain a 10 mm square test piece 4 mm thick.

[Example 6]
The same material as in Example 1 except that as the first metal sheet material 10, one having a primer layer on the side facing the resin sheet material 20 side of the aluminum alloy of 3000 series of JIS designation 0.5 mm thick was used. The respective materials were joined using a heat press at 190 ° C. and 10 kg / cm ² for 3 minutes in a heat press machine to obtain a 10 mm square test piece having a thickness of 4 mm.

[Example 7]
The first metal sheet 10 is a 0.5 mm thick JIS series 3000 series aluminum alloy using a primer having a primer layer on the side facing the resin sheet 20, for a thick paper 30 with a thickness of 1 mm Conditions of 190 ° C., 10 kg / cm ² , 3 minutes in a heat press using the same material as in Example 1 except that the thick paper (manufactured by Nippon Paper Industries Co., Ltd., product number: FNN-NC) was used The respective materials were joined together to obtain a 10 mm square test piece 4 mm thick.

Comparative Example 1
Using the same material as in Example 1 except that the thick paper 30 was not used, each material was joined under the conditions of 190 ° C., 10 kg / cm ² for 3 minutes with a heat press machine, and a thickness of 4 mm in 10 cm square. Test pieces were obtained.

Comparative Example 2
Each material is joined under the conditions of 190 ° C., 10 kg / cm ² and 3 minutes with a heat press using the same material as in Example 1 except that the second metal sheet material 40 is not used, 10 cm Test pieces of 4 mm in thickness were obtained at the corners.

Comparative Example 3
190 ° C., 10 kg by a heat press using the same material as in Example 1 except using aluminum hydroxide paper (Olivest Co., product number: WB-150) with a thickness of 0.15 mm as the thick paper 30 Each material was joined on condition of 3 cm / cm ² for 3 minutes to obtain a 10 mm square and 4 mm thick test piece.

Comparative Example 4
Three sheets of aluminum hydroxide paper (Olivest Co., Ltd., product number: WB-150) with a thickness of 0.15 mm as the thick paper 30 and an adhesive sheet with a thickness of 50 μm made of maleic anhydride-modified polyethylene disposed between the layers Each material is joined under the conditions of 190 ° C., 10 kg / cm ² and 3 minutes with a heat press machine using the same material as in Example 1 except that the laminated and integrated by heat welding is used, 10 cm Test pieces of 4 mm in thickness were obtained at the corners.

Comparative Example 5
Four sheets of aluminum hydroxide paper (Olivest Co., Ltd., product number: WB-150) with a thickness of 0.15 mm as the thick paper 30 and an adhesive sheet with a thickness of 50 μm made of maleic anhydride-modified polyethylene are disposed between the four sheets. Each material is joined under the conditions of 190 ° C., 10 kg / cm ² and 3 minutes with a heat press machine using the same material as in Example 1 except that the laminated and integrated by heat welding is used, 10 cm Test pieces of 4 mm in thickness were obtained at the corners.

Comparative Example 6
The same material as in Example 1 was used at 190 ° C. and 10 kg / kg with a heat press machine, except that calcium carbonate paper 0.15 mm thick (Olivest Co., product number: NCA-160) was used as the thick paper 30. Each material was joined on condition of cm ² for 3 minutes to obtain a 10 mm square and 4 mm thick test piece.

Comparative Example 7
Three sheets of calcium carbonate paper (Olivest Co., product number: NCA-160) with a thickness of 0.15 mm as the thick paper 30 and an adhesive sheet with a thickness of 50 μm made of maleic anhydride-modified polyethylene are disposed between the three Using the same material as in Example 1 except that laminated and integrated by welding, the respective materials are joined under the conditions of 190 ° C., 10 kg / cm ² and 3 minutes by a heat press machine, and a 10 cm square is obtained. Test pieces of 4 mm in thickness were obtained.

Comparative Example 8
Four sheets of calcium carbonate paper (Olivest Co., Ltd., product number: NCA-160) with a thickness of 0.15 mm as the thick paper 30 and an adhesive sheet with a thickness of 50 μm made of maleic anhydride-modified polyethylene are disposed between the four Using the same material as in Example 1 except that laminated and integrated by welding, the respective materials are joined under the conditions of 190 ° C., 10 kg / cm ² and 3 minutes by a heat press machine, and a 10 cm square is obtained. Test pieces of 4 mm in thickness were obtained.

  In the results of Table 1 and Table 2, when Example 1 and Comparative Example 2 are compared, the second metal sheet of the 0.007 mm thick aluminum foil which is not more than one tenth of the first metal sheet material 10 Even when 40 is used, it is understood that the occurrence of warping is suppressed by using the thick paper 30 in combination. In the second metal sheet 40 of this thickness, although contribution to suppression of warpage generation by heat contraction seems to be small, heat in the inside of the test sample is smoothly released from the surface to make distortion difficult to occur. it is conceivable that.

  Moreover, when Example 1 and Comparative Examples 3-8 are compared, although the predetermined Taber stiffness is required as thick paper 30, the comparison which increased the thickness of Taber 30 as shown in Table 3, and raised Taber stiffness. Warpage also occurs in Example 4, Comparative Example 5, Comparative Example 7, and Comparative Example 8. Although the cause is unclear, when the thick paper 30 has a laminated structure of paper and adhesive sheet, distortion accumulates in the thick paper 30 due to the difference between the thermal expansion coefficient of the paper and the adhesive sheet due to cold heat repetition, and expansion and contraction of the entire laminate It is considered that the thick paper 30 could not follow.

  As mentioned above, although the laminated body of this invention was demonstrated based on embodiment, this invention is not limited to these embodiment. It is within the scope of the present invention to apply various modifications that those skilled in the art would think within the scope of the present invention.

  The present invention can be widely used as interior materials of buildings such as ceiling materials and inner wall materials.

10 First metal sheet material 20 Resin sheet material 30 Thick paper 40 Second metal sheet material P Laminated body

Claims (2)

A resin sheet material, a first metal sheet material made of aluminum or aluminum alloy joined to one surface of the resin sheet material, a cardboard joined to the other surface of the resin sheet material, and a resin of the cardboard A sheet material and a second metal sheet material joined to the opposite side and thinner than the first metal sheet material and made of aluminum or aluminum alloy,
The laminate is characterized in that the thick paper has a Taber stiffness of 20 to 80 mN · m and is a single layer. The thickness of the said 1st metal sheet material is 0.05-0.3 mm, The laminated body of Claim 1 characterized by the above-mentioned.

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