Laminated body for reinforcing plates

Abstract

To provide a laminated body for reinforcing a plate body capable of suppressing distortion of a plate body while sufficiently reinforcing a rigidity of the plate body.SOLUTION: A laminated body for reinforcing a plate body of the present invention includes an adhesive layer made of a thermosetting resin and a reinforcing layer laminated on one side of the adhesive layer. The reinforcing layer has a coefficient of thermal expansion of 11 to 14 (10-6 / K), a thickness of 0.050 mm or more and 0.30 mm or less, and a surface roughness Ra of 0.05 μm or more and 4.0 μm or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a laminate for reinforcing a plate, which is attached to one surface of a plate to reinforce the plate and improve its rigidity. [Background technology]

[0002] In recent years, there has been a demand in the industrial world for thinner plates that constitute structures. For example, in the case of vehicles, there is a strong demand for thinner plates that constitute the body in order to improve fuel efficiency by reducing the weight of the body. However, when thinner plates are used, a problem arises in that the rigidity of the plates is reduced.

[0003] Therefore, in recent years, plate reinforcing members have been used that are attached to one side of a plate to reinforce the plate and improve its rigidity. One known plate reinforcing member uses a padding material based on an epoxy resin with a high tensile modulus of elasticity, attached to one side of the plate, and hardened by a heat treatment during the plate coating process, thereby reinforcing the plate and ensuring its rigidity. Other known plate reinforcing members include a padding material in which glass cloth or a metal plate is laminated on the padding material to further enhance rigidity, and a padding material in which aluminum foil is attached as a surface to the glass cloth laminated on the padding material to reduce the moisture absorption of the glass cloth (Patent Document 1).

[0004] Also known is a plate reinforcing member in which woven or nonwoven fabric embedded in a thermosetting resin layer is sealed with a heat-resistant resin to prevent the fabric from fraying and ensure its rigidity (Patent Document 2). On the other hand, when a thermosetting resin is used for the plate reinforcing member, shrinkage may occur due to the characteristics of the thermosetting resin. The shrinkage force generated by the shrinkage of the plate reinforcing member is transmitted to the plate, causing distortion in the plate. In response to this, a plate reinforcing member has been proposed that is constructed by stacking reinforcing layers and thickening the center of the reinforcing layers to reduce this distortion (Patent Document 3). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 61-279550 [Patent Document 2] Japanese Patent Application Publication No. 2-80479 [Patent Document 3] Japanese Patent Application Laid-Open No. 2003-127897 Summary of the Invention [Problem to be solved by the invention]

[0006] However, with the technology of Patent Document 1, because the thermal expansion coefficients of glass cloth or aluminum foil differ from those of the plate material, it is difficult to significantly reduce the occurrence of thermal distortion, making it difficult to achieve high design quality in the plate. Furthermore, in Patent Document 2, because glass cloth is used as the reinforcing substrate, a difference in thermal expansion occurs between the reinforcing substrate and the plate, so the occurrence of thermal distortion cannot be sufficiently suppressed, making it difficult to achieve high design quality in the plate. Furthermore, in Patent Document 3, a room-temperature curable resin is used as a coating-type reinforcing material, which is applied to the surface of the plate at a constant width to impart rigidity to the plate, and deformation such as waviness is suppressed by controlling the thickness of the applied coating. However, since rigidity is ensured only by applying the resin to form a thickness, it cannot be said that the effect of increasing rigidity is sufficient.

[0007] Therefore, an object of the present invention is to provide a laminate for reinforcing a plate body, which can suppress distortion of the plate body while sufficiently reinforcing the rigidity of the plate body. [Means for solving the problem]

[0008] The gist and configuration of the present invention are as follows. (1) an adhesive layer made of a thermosetting resin; a reinforcing layer laminated on one surface of the adhesive layer, The reinforcing layer has a thermal expansion coefficient of 11 to 14 (10 -6 / K), having a thickness of 0.050 mm or more and 0.30 mm or less, and a surface roughness Ra of 0.05 μm or more and 4.0 μm or less.

[0009] Here, the "thermal expansion coefficient" is measured in accordance with JIS Z2285 by preparing a test piece from a sheet material of the same material as the reinforcing layer, with a diameter of 4 mm and a length of 20 mm. The measurement conditions are 20 to 300°C, a temperature rise rate of 5°C / min, and a push rod load of 0.196 N. The thermal expansion coefficient at 20°C is set to 0, and the thermal expansion coefficient at 300°C is measured. The average thermal expansion coefficient from 20 to 300°C is calculated and used as the linear expansion coefficient. Furthermore, to measure the "surface roughness Ra," a test piece was prepared by processing a sheet material made of the same material as the reinforcing layer into a 50 mm square, and a 10 mm area parallel to the surface was scanned 10 times at 100 μm intervals using a stylus-type surface roughness meter. The arithmetic mean roughness (Ra) for each scan line was calculated in accordance with JIS B0601, and the average was taken as the surface roughness Ra.

[0010] (2) The plate-reinforcing laminate according to (1) above, wherein the adhesive layer made of the thermosetting resin is an epoxy resin-based adhesive layer.

[0011] (3) The laminate for reinforcing a plate according to (1) or (2) above, wherein the reinforcing layer is a metal plate.

[0012] (4) The plate-reinforcing laminate according to any one of (1) to (3) above, wherein the reinforcing layer is a steel plate.

[0013] (5) The plate-reinforcing laminate according to any one of (1) to (4) above, wherein the reinforcing layer has a thickness of 0.075 mm or more and 0.25 mm or less. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a laminate for reinforcing a plate body, which can suppress distortion of the plate body while sufficiently reinforcing the rigidity of the plate body. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a front view showing a plate and a plate-reinforcing laminate according to one embodiment of the present invention adhered to the plate; DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0017] FIG. 1 is a front view showing a plate and a plate-reinforcing laminate according to one embodiment of the present invention adhered to the plate.

[0018] The plate 1 has one surface 1a and the other surface 1b. The plate-reinforcing laminate 2 of this embodiment is attached to one surface 1a of the plate 1 to reinforce the plate 1. First, the plate 1 whose rigidity is to be reinforced by the plate-reinforcing laminate 2 will be described.

[0019] <Board> The plate body 1 is, for example, a plate body that constitutes a vehicle body, with one surface 1a of the plate body 1 facing the inside of the vehicle and the other surface 1b facing the outside of the vehicle. The material of the plate body 1 is not particularly limited, but in this embodiment it is a steel plate. The thickness of the plate body 1 is not particularly limited, but can be 0.60 to 0.75 mm, and from the viewpoint of weight reduction, it is particularly preferable that it be 0.70 mm or less.

[0020] <Laminate for reinforcing plates> As shown in FIG. 1, the thin plate reinforcing laminate 2 includes an adhesive layer 3 made of a thermosetting resin, and a reinforcing layer 4 laminated on one surface 3b of the adhesive layer 3.

[0021] <<adhesive layer>> The adhesive layer 3 is a layer having self-adhesive properties (i.e., it has adhesive properties by itself without the use of other adhesives, etc.). As a result, one side 3b of the adhesive layer 3 can be attached to the reinforcing layer 4 as described below, and the opposite side 3a can be attached to the surface of the plate 1 (one side 1a in the illustration). In this way, the plate-reinforcing laminate 2 is constructed by utilizing the adhesive force of the adhesive layer 3. In the illustrated example, the adhesive layer 3 is formed in a sheet shape. In the illustrated example, the length (depth direction in the illustration) and width (vertical direction in the illustration) of the reinforcing layer 4 are smaller than the length and width of the plate 1, and the length and width of the adhesive layer 3 are the same as the length and width of the reinforcing layer 4.

[0022] The thermosetting resin is thermally cured (under predetermined curing conditions). By curing the adhesive layer 3, it is possible to exert the effect of reinforcing the rigidity of the plate body 1. In this embodiment, the adhesive layer 3 is made of a thermosetting resin, and can be cured by heat treatment. As the thermosetting resin, for example, a known epoxy resin-based material can be used. Furthermore, the adhesive layer 3 may be a non-foamed layer or a foamed layer.

[0023] <<Reinforcing layer>> The reinforcing layer 4 has a thermal expansion coefficient of 11 to 14 (10 -6 / K) (in this embodiment, it is a plate-shaped member (steel plate)), the thickness is 0.050 mm or more and 0.30 mm or less, and the surface roughness Ra is 0.05 μm or more and 4.0 μm or less. By using such a reinforcing layer 4, the deformation of the adhesive layer 3, which is a cured product, is restrained, thereby contributing to improving the rigidity of the plate body 1 by the adhesive layer 3, which is a cured product. In other words, the thermal expansion coefficient of the reinforcing layer 4 is 11 to 14 (10 -6 / K), the deformation of the reinforcing layer 4 follows the thermal deformation of the plate 1 during the heat treatment and when returning to room temperature, and the distortion of the plate 1b can be suppressed. -6 / K), distortion of the plate 1 during heat treatment and when returning to room temperature cannot be suppressed. -6 / K), distortion of the plate 1 cannot be suppressed during the heat treatment and when returning to room temperature. -6 / K) or more is more preferable, and 13.5 (10 -6 / K) or less. Furthermore, if the surface roughness Ra of the reinforcing layer 4 is less than 0.05 μm, distortion of the plate 1 cannot be suppressed during heat treatment or when returning to room temperature. On the other hand, if it exceeds 4.0 μm, distortion of the plate 1 cannot be suppressed during heat treatment or when returning to room temperature. For the same reason, the surface roughness Ra of the reinforcing layer 4 is more preferably 0.10 μm or more, and more preferably 3.5 μm or less. Furthermore, if the thickness of the reinforcing layer 4 is less than 0.050 mm, the effect of improving the rigidity of the plate 1 to which the plate reinforcing laminate 2 is attached is not achieved. On the other hand, if the thickness exceeds 0.30 mm, the effect of improving the rigidity of the plate 1 is enhanced, but the weight cannot be reduced. For the same reason, the thickness of the reinforcing layer 4 is preferably 0.075 mm or more, and more preferably 0.25 mm or less. Preferably, the area of ​​the surface of the reinforcing layer 4 laminated on the adhesive layer 3 is 10 to 50% of the area of ​​the surfaces 1a and 1b of the plate 1. By setting the ratio to 10% or more, the effect of improving the rigidity of the plate body 1 can be further improved, while by setting the ratio to 50% or less, weight reduction can be minimized. As the reinforcing layer 4, a plate-shaped member, particularly a metal plate, is preferably used, but other materials such as a resin plate can also be used. As the metal plate, a steel plate is preferably used. When a steel plate is used, it is preferably a steel type such as carbon steel, and it is also preferable that the steel have mechanical properties such as a tensile strength of 200 MPa to 700 MPa.

[0024] As described above, according to the plate-reinforcing laminate 2 of this embodiment, the adhesive layer 3 attached to one surface 1a of the plate 1 is made of a thermosetting resin that is thermally cured, and the thickness of the reinforcing layer 4 laminated on one surface 3b of the adhesive layer 3 is 0.050 mm or more, so that the rigidity of the plate 1 can be effectively improved. Furthermore, the thermal expansion coefficient of the reinforcing layer 4 is 11 to 14 (10 -6 / K), the reinforcing layer 4 can deform in accordance with the thermal deformation of the plate 1 during the heat treatment in the paint baking process (typically performed at a heat treatment temperature of about 170°C for a heat treatment time of about 20 minutes) that is performed after the adhesive layer 3 is attached to the plate 1, and when the plate 1 is returned to room temperature, thereby suppressing distortion of the plate 1b. In addition, since the thickness of the reinforcing layer 4 is 0.30 mm or less, weight reduction is also possible. For example, if the plate-reinforcing laminate 2 of this embodiment is applied to the plate constituting a vehicle body, the vehicle body can be made lighter while ensuring the rigidity of the vehicle body, and further, a beautiful vehicle body can be produced without distortion of the plate body.

[0025] Here, the plate-reinforcing laminate 2 is manufactured by forming the adhesive layer 3 by, for example, extrusion molding, injection molding, or the like, and laminating a separately prepared reinforcing layer 4 on one side 3b of the adhesive layer 3. The lamination can be performed by adhering one side 3b of the adhesive layer 3 to the reinforcing layer 4 in an unheated, tack-like state. The plate-reinforcing laminate 2 thus obtained is also tack-attached to the plate 1, and then thermally cured, for example, using the heat generated when painting the plate 1, to form a laminate structure in which the adhesive layer 3 is sandwiched between the plate 1 and the reinforcing layer 4.

[0026] In the present disclosure, a vehicle structural member includes a plate and a plate-reinforcing laminate attached to one surface of the plate to reinforce the plate, the plate-reinforcing laminate including an adhesive layer made of a thermosetting resin and a reinforcing layer laminated on one surface of the adhesive layer, and a surface opposite to the one surface of the adhesive layer is attached to one surface of the plate, and the reinforcing layer has a thermal expansion coefficient of 11 to 14 (10 -6 / K), the thickness is 0.050 mm or more and 0.30 mm or less, and the surface roughness Ra is 0.05 μm or more and 4.0 μm or less.

[0027] Examples of the present invention will be described below, but the present invention is not limited to the following examples. [Example]

[0028] (Test example) An experiment was conducted to confirm the effect of improving the rigidity of a plate body and the design surface distortion caused by the plate body reinforcing laminate. [Rigidity test] Opposing edges of a plate (size: plate thickness 0.6 mm x width 500 mm x length 500 mm) were grasped and bent to form a curved surface with a radius of 1200 mm, and a plate-reinforcing laminate (size: width 150 mm x length 400 mm) was attached to a predetermined location on one side of the plate. In this state, it was heated at a heat treatment temperature of 180°C for 30 minutes to fix the adhesive layer to the plate. It was then cooled to room temperature. Next, a pressing jig with a tip radius of 80 mm was used to press the center of the other side opposite the side to which the plate-reinforcing laminate was attached, and the displacement when a load of 100 N was applied was measured. [Design surface distortion test] A plate (size: plate thickness 0.6 mm x width 500 mm x length 500 mm) was press-molded into a curved surface with a radius of 1200 mm, and a plate-reinforcing laminate was attached to a predetermined location on one side of the plate. In this state, the displacement of the other side opposite the side to which the plate-reinforcing laminate (size: width 150 mm x length 200 mm) was attached was measured using a three-dimensional measuring device. The plate was then heated at 180°C for 30 minutes to fix the adhesive layer to the plate, and then cooled to room temperature. In this state, the displacement of the other side opposite the side to which the plate-reinforcing laminate (size: width 150 mm x length 200 mm) was attached was again measured using a three-dimensional measuring device. The difference in displacement before and after heating was determined, and a displacement difference of 0.2 mm or more was considered poor design surface distortion (×), while a displacement difference of less than 0.2 mm was considered good design surface distortion (○). To measure the linear expansion coefficient, a sheet material made of the same material as the reinforcing layer was processed to a diameter of 4 mm and a length of 20 mm to prepare a test piece, and the thermal expansion coefficient was measured in accordance with JIS Z2285. The measurement conditions were 20 to 300°C, a heating rate of 5°C / min, and a push rod load of 0.196 N. The thermal expansion coefficient at 20°C was set to 0, and the thermal expansion coefficient at 300°C was measured, and the average thermal expansion coefficient from 20 to 300°C was calculated and used as the linear expansion coefficient. To measure the surface roughness, a test piece was prepared by cutting a sheet material made of the same material as the reinforcing layer into a 50 mm square. A 10 mm area parallel to the surface was scanned 10 times at a pitch of 100 μm using a stylus surface roughness meter. The arithmetic mean roughness (Ra) for each scan line was calculated in accordance with JIS B0601, and the average was taken as the surface roughness Ra. The test results are shown in Table 1. No. 1 and No. 2 showed small displacement when a load of 100 N was applied, indicating improved rigidity of the plate body. It can also be seen that No. 1 and No. 2 showed good design surface distortion.

[0029] [Table 1] [Explanation of symbols]

[0030] 1: Plate 2: Laminated body for reinforcing plates 3: Adhesive layer 4: Reinforcement layer

Claims

1. an adhesive layer made of a thermosetting resin; a reinforcing layer laminated on one surface of the adhesive layer, The reinforcing layer has a thermal expansion coefficient of 11 to 14 (10 －６ / K), having a thickness of 0.050 mm or more and 0.30 mm or less and a surface roughness Ra of 0.05 μm or more and 4.0 μm or less, A laminate for reinforcing a plate, characterized in that the surface is in contact with the one side of the adhesive layer.

2. 2. The plate-reinforcing laminate according to claim 1, wherein the adhesive layer made of a thermosetting resin is an epoxy resin-based adhesive layer.

3. 3. The plate-reinforcing laminate according to claim 1, wherein the reinforcing layer is a metal plate.

4. The plate-reinforcing laminate according to claim 3 , wherein the reinforcing layer is a steel plate.

5. The plate-reinforcing laminate according to any one of claims 1 to 4, wherein the reinforcing layer has a thickness of 0.075 mm or more and 0.25 mm or less.

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