Composite material

Abstract

The present specification discloses a composite material and a use thereof. The present specification discloses a composite material comprising a plastic plate and a metal plate which are bonded to each other while exhibiting excellent bonding force, wherein an inner space can be formed at a bonding interface between the plastic plate and the metal plate, and excellent airtightness is ensured in the inner space together with the excellent bonding force. The present specification also discloses a composite material having a large area, while also exhibiting excellent bonding force and excellent airtightness. The present specification also discloses a use of the composite material.

Description

composite materials

[0001] This application claims the benefit of priority to Republic of Korea Patent Application No. 10-2023-0098469, dated July 27, 2023, and Republic of Korea Patent Application No. 10-2023-0143283, dated October 24, 2023, the entire contents of which are incorporated herein by reference.

[0002] This specification discloses composite materials and their uses.

[0003] The technology to firmly attach dissimilar materials, such as metal and plastic, without deformation of the appearance is useful in various fields.

[0004] Heat dissipation materials, such as heat sinks, are typically made of metals with high thermal conductivity. However, metals are generally disadvantageous for weight reduction and offer limited freedom in shape. Therefore, by forming the portions of a heat dissipation material, such as a heat sink, that primarily require heat transfer from metal, while forming the other portions from materials like plastic, we can achieve a material that simultaneously satisfies both heat transfer and lightweight characteristics, while also offering greater freedom in shape design.

[0005] However, it is not easy to firmly and stably attach dissimilar materials such as metal and plastic.

[0006] For example, even when using adhesives, achieving high adhesion and durability between dissimilar materials like metal and plastic is challenging. This is because adhesives that exhibit both high adhesion to metal and high adhesion to plastic are rare.

[0007] Additionally, to obtain the above heat sink, an internal space (cavity) must be formed at the bonding interface of the dissimilar materials through which a cooling medium can flow. To improve heat dissipation properties, the area of ​​the internal space must be increased. However, as the internal space increases, the bonding area between the metal and plastic decreases.

[0008] Manufacturing a composite material that stably bonds dissimilar materials while still containing the aforementioned internal space is a challenging task. This challenge becomes even more challenging when manufacturing composite materials on a large scale.

[0009] Additionally, in order to apply composite materials to parts such as heat sinks, strong bonding between dissimilar materials and airtightness of the internal space must be provided.

[0010] To cool and dissipate heat, a cooling medium, such as coolant or air, circulates within the heat sink. Since this cooling medium is typically a fluid, if the internal space is not airtight, leakage of the cooling medium to the outside may occur. This airtightness is not achieved simply by ensuring high bonding strength.

[0011] The present specification discloses a composite material and its uses. The purpose of the present specification is to disclose a composite material comprising a plastic plate and a metal plate that are bonded to each other while exhibiting excellent bonding strength. The purpose of the present specification is to disclose a composite material in which an internal space is formed at the bonding interface between the plastic plate and the metal plate, and in which excellent bonding strength and excellent airtightness are secured in the internal space. The purpose of the present specification is also to disclose a method for securing the excellent bonding strength and excellent airtightness even when the composite material is manufactured on a large area. The purpose of the present specification is also to disclose uses of the composite material.

[0012] Among the properties mentioned in this specification, properties that are affected by temperature are properties measured at room temperature, unless otherwise specified.

[0013] The term room temperature means a natural temperature that has not been artificially heated or cooled, for example, a temperature within the range of about 10°C to 30°C, for example, a temperature of about 23°C or about 25°C.

[0014] Unless otherwise specified in this specification, the unit of temperature is ℃.

[0015] Among the properties mentioned in this specification, the properties affected by pressure are properties measured at atmospheric pressure, unless otherwise specified.

[0016] The term atmospheric pressure refers to the natural pressure that has not been artificially pressurized or depressurized, and is usually a pressure within the range of about 700 mmHg to 800 mmHg.

[0017] Among the properties mentioned in this specification, properties affected by humidity are properties measured at standard humidity, unless otherwise specified.

[0018] Standard humidity means a relative humidity within the range of 40% to 60%, for example, a relative humidity of about 40% or 60%.

[0019] The present specification discloses a composite material.

[0020] The term composite material refers to a material that includes at least two different materials. For example, the composite material may include a plastic plate and a metal plate as different materials.

[0021] In the above composite material, the plastic plate and the metal plate may be bonded to each other. The bonding may be a bonding that does not use another material such as an adhesive, and in this case, at least a portion of the plastic plate and at least a portion of the metal plate may be in direct contact with each other.

[0022] For example, the composite material may include a metal plate having a first surface and a second surface opposite the first surface; and a plastic plate having a third surface and a fourth surface opposite the third surface.

[0023] The first surface of the metal plate is either a surface having the largest area among the surfaces of the metal plate or an opposite surface thereof, and the second surface is a surface opposite the first surface. The first and second surfaces may have the same areas. In addition, the third surface of the plastic plate is either a surface having the largest area among the surfaces of the plastic plate or an opposite surface thereof, and the fourth surface is a surface opposite the third surface. The third and fourth surfaces may have the same areas.

[0024] For example, in a composite material, the first surface of the metal plate and the third surface of the plastic plate may be bonded to each other. In the structure, no other element may exist between the first surface of the metal plate and the third surface of the plastic plate. That is, an element that attaches the metal plate and the plastic plate to each other, such as an adhesive or a pressure-sensitive adhesive, may not exist between the two.

[0025] As used herein, the term "bonding region" refers to the region where the metal plate and the plastic plate are attached to each other. A bonding strength of a certain level or higher may be secured in the bonding region. In one example, the bonding region may be a region where at least one or both of the metal plate and the plastic plate are melted or softened and then cooled to attach the metal plate and the plastic plate to each other, for example, a region where the metal plate and the plastic plate are fused.

[0026] In the above composite material, excellent and stable bonding strength can be secured in the bonding area.

[0027] There is no particular limitation on the type of plastic plate included in the above composite material. For example, a plastic plate containing a resin component and a filler component can be used as the above plastic plate.

[0028] There is no particular limitation on the type of resin component included in the above plastic plate. For example, the resin component may be selected and used appropriately from among resin components known to be moldable by applying heat or the like.

[0029] For example, a thermoplastic polymer can be used as the resin component. Applicable thermoplastic polymers include various crystalline or amorphous polymers, and examples thereof include, but are not limited to, polyolefin polymers such as PP (polypropylene) or PE (polyethylene), polyalkylene oxide polymers such as mPPO (Modified PPO (Polyethylene oxide)), polyamide polymers such as PA (polyamide), acetal polymers such as POM (polyoxymethylene), polyester polymers such as PC (polycarbonate), PBT (polybutylene terephthalate) or PET (polyethylene terephthalate), acrylic polymers such as PMMA (poly(methyl methacrylate)), and polystyrene polymers such as PS (polystyrene) or ABS (Acrylonitrile butadiene styrene). One or a mixture of two or more of the above may be included in the plastic plate.

[0030] There is no particular limitation on the ratio of the resin component within the plastic plate. For example, based on the total weight of the plastic plate, the lower limit of the ratio of the resin component within the plastic plate may be approximately 60 wt%, 65 wt%, 70 wt%, 75 wt%, or 80 wt%, and the upper limit may be approximately 100 wt%, 95 wt%, 90 wt%, 85 wt%, or 80 wt%. The ratio may be within a range that is equal to or greater than any one of the lower limits listed above and equal to or less than any one of the upper limits listed above. The closer this ratio range is to the value in the composite material exemplified in the examples, the more improved effects can be expected.

[0031] The above plastic plate may include a filler component as an additional component. Such a filler component may be included, for example, as a reinforcing material.

[0032] There are no special limitations on examples of filler components. For example, filler components may include organic fillers such as glass fillers, carbon fillers, and / or silica fillers, inorganic fillers, or organic-inorganic fillers.

[0033] The shape of the above filler is determined according to the purpose and there are no special limitations. For example, the filler may be a particulate filler (a particulate filler of a spherical, angular, irregular or other shape), a plate-shaped filler or a fibrous filler.

[0034] There is no specific limitation on the thickness of the above plastic plate. The thickness of the plastic plate can be adjusted to an appropriate level considering the desired strength, bonding strength, and other physical properties. For example, the lower limit of the thickness of the plastic plate may be about 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0, and the upper limit may be about 20.0, 19.0, 18.0, 17.0, 16.0, 15.0, 14.0, 13.0, 12.0, 11.0, 10.0, 9.0, 8.0, 7.0, 6.0, 5.0, 4.0, 3.0 or 2.0. The unit of the thickness is mm. The above thickness may be within a range that is equal to or greater than any one of the lower limits listed above and equal to or less than any one of the upper limits listed above. The closer this thickness range is to the values ​​in the composite materials exemplified in the examples, the more improved effects can be expected.

[0035] There are no specific restrictions on the type of metal plate included in the composite material. The metal plate may be selected based on the intended use of the composite material. For example, when applying the composite material as a heat-dissipating material, a metal or metal alloy having a certain level of thermal conductivity or higher may be used.

[0036] For example, the lower limit of the thermal conductivity of the metal or metal alloy may be about 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 120, 140, 160, 180 or 200, and the upper limit may be about 1000, 900, 800, 700, 600, 500, 400, 300, 200, 190, 180, 170 or 160. The unit of the above thermal conductivity is W / mK. When applied as a heat-radiating material, the thermal conductivity may be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The closer this range of thermal conductivity is to the values ​​of the composite materials exemplified in the examples, the more improved effects can be expected.

[0037] Examples of the above materials include, but are not limited to, metals such as aluminum, SUS (stainless steel), tungsten, iron, cast iron, and / or copper, or metal alloys containing the above metals.

[0038] The above metal plate may have a unique melting temperature (Tm) depending on the type of metal. For example, the lower limit of the melting temperature of the metal plate may be about 300°C, 350°C, 400°C, 450°C, 500°C, 550°C, 600°C, 650°C, 700°C, 750°C, 800°C, 850°C, 900°C, 950°C, 1000°C, 1050°C, 1100°C, 1150°C, 1200°C, 1250°C, 1300°C, 1350°C or 1400°C, and the upper limit may be about 3000°C, 2500°C, 2000°C, 1900°C, 1800°C, 1700°C, 1600°C, 1500°C, 1400°C, 1300°C, It can be about 1200℃, 1100℃, 1000℃, 900℃, 850℃, 800℃, 750℃ or 700℃. The melting temperature of the metal plate can be within a range that is equal to or greater than any one of the lower limits listed above; within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and less than or equal to any one of the upper limits listed above. The closer this melting temperature range is to the values ​​in the composite materials exemplified in the examples, the more improved effects can be expected.

[0039] There is no specific limitation on the thickness of the metal plate. The thickness of the metal plate can be adjusted to an appropriate level considering the desired bonding strength, thermal conductivity, and airtightness. For example, the lower limit of the thickness of the metal plate may be about 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3.0, and the upper limit may be about 20.0, 19.5, 19.0, 18.5, 18.0, 17.5, 17.0, 16.5, 16.0, 15.5, 15.0, 14.5, 14.0, 13.5, 13.0, It can be about 12.5, 12.0, 11.5, 11.0, 10.5, 10.0, 9.5, 9.0, 8.5, 8.0, 7.5, 7.0, 6.5, 6.0, 5.5, 5.0, 4.5, 4.0, 3.5 or 3.0. The unit of the thickness is mm. The thickness can be within a range that is equal to or greater than any one of the lower limits listed above and equal to or less than any one of the upper limits listed above. The closer this thickness range is to the value in the composite material exemplified in the embodiment, the more improved effect can be expected.

[0040] In the composite material, the plastic plate and / or metal plate may have a rough shape. In this case, an internal space due to the rough shape may be formed at the bonding interface between the plastic plate and the metal plate.

[0041] The above-mentioned uneven shape can be formed with a convex shape and a concave shape. Fig. 1 is an example in which, among the plastic plate (100) and the metal plate (200), the plastic plate (100) is formed with an uneven shape having a convex shape (1001) and a concave shape (1002), thereby forming an internal space (C) at the bonding interface. In the uneven shape, the convex shape and the concave shape are relative concepts, and in this specification, the shape that forms a surface that comes into contact with another material is called a concave shape. This shape of Fig. 1 can be formed by attaching a plastic plate (100) and a metal plate (200) having an uneven shape to each other, as shown in Fig. 2.

[0042] In the examples of FIGS. 1 and 2, the plastic plate (100) has a rough shape, but the metal plate (200) may also have a rough shape, and in some cases, both the plastic plate (100) and the metal plate (200) may have a rough shape.

[0043] The internal space of the above composite material can exhibit excellent airtightness.

[0044] The above-mentioned airtightness refers to the property of withstanding the pressure of a fluid, such as coolant or air, injected into the sealed internal space, and preventing the fluid from leaking to the outside. This airtightness is not achieved simply by achieving high bonding strength.

[0045] The airtightness of this internal space can be represented by the maximum allowable internal pressure. The maximum allowable internal pressure is the internal pressure achieved by injecting air into the internal space of the composite material (the internal space in a sealed state), and refers to the internal pressure that can maintain the pressure substantially constant in units of bar for a certain period of time (approximately 60 seconds) from the time when the injection of the fluid being injected to achieve the internal pressure is stopped. In this case, the injected fluid may be, for example, air. The internal pressure being maintained substantially constant may refer to a case in which the pressure drop over 60 seconds is described below.

[0046] The method for evaluating this maximum allowable internal pressure is described in the item of “Test Example 4” of this specification. For example, the lower limit of the maximum allowable internal pressure may be about 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4 or 2.5, and the upper limit may be about 5, 4.5, 4, 3.5, 3, 2.9, 2.8, 2.7, 2.6 or 2.5. The unit of the maximum allowable internal pressure is bar. The maximum allowable internal pressure may be within a range that is equal to or greater than any one of the listed lower limits; or within a range that is equal to or greater than any one of the listed lower limits and at the same time less than or equal to any one of the listed upper limits. The closer the range of this maximum allowable internal pressure is to the value in the composite material exemplified in the embodiment, the more improved effect can be expected.

[0047] The internal space may also have a sealing property that exhibits a certain level of pressure drop rate. The pressure drop rate is the rate of pressure drop measured from the point in time when the injection of fluid is stopped after air is injected into the internal space of the composite material (the internal space in a sealed state) so as to achieve the maximum allowable internal pressure or a higher pressure, and its unit is Pa / sec. The method for evaluating the pressure drop rate is described in “Test Example 4” of the present specification. The upper limit of the pressure drop rate may be about 20, 18, 16, 14, 12, 10, 8, or 6, and the lower limit may be about 1, 2, 3, 4, 5, or 6. The pressure drop rate may be within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The closer the above range is to the value in the composite material exemplified in the example, the more improved effect can be expected.

[0048] The internal space of the above composite material may have an airtightness that indicates a certain level of 60-second pressure drop. The 60-second pressure drop refers to a value (P1-P2) obtained by subtracting the pressure (P2) at a point in time 60 seconds after the injection of air is stopped after the target pressure (P1) is achieved in the internal space. The target pressure may be the maximum allowable internal pressure or a pressure higher than the maximum allowable internal pressure. The method for evaluating the 60-second pressure drop is described in “Test Example 4” of the present specification. The lower limit of the 60-second pressure drop may be about 1, 1.5, 2, 2.5, 3, 3.5, or 4, and the upper limit may be about 20, 18, 16, 14, 12, 10, 8, 6, 5.5, 5, 4.5, 4, or 3.5. The unit of the 60-second pressure drop is mbar. The 60-second pressure drop may be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and less than or equal to any one of the upper limits listed above. The closer the range is to the value in the composite material exemplified in the embodiment, the more improved the effect can be expected.

[0049] The above internal space may also exhibit an appropriate level of pressure reduction. This pressure reduction level can be confirmed according to the following equation I.

[0050] [Formula I]

[0051] LP = 100 × (P MAX -P 60 ) / P MAX

[0052] In Equation I, LP is the pressure reduction level, and P MAX is the maximum allowable internal pressure, and P 60is the pressure drop over the above 60 seconds.

[0053] The above P to check the LP of Equation I 60 When measuring, the target pressure is set as the maximum allowable internal pressure. A specific method for verifying Formula I is described in “Test Example 4” of this specification.

[0054] The upper limit of the above pressure reduction level LP may be about 0.5, 0.4, 0.3, 0.200, 0.197, 0.194, 0.191, 0.188, 0.185, 0.182, 0.179, 0.176, 0.173, 0.170, 0.167, 0.164, 0.161, 0.158, 0.155, 0.152, 0.149, 0.146, 0.143 or 0.140, and the lower limit may be about 0, 0.01, 0.05, 0.1 or 0.15. The unit of the above LP is %. The above pressure reduction level LP may be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and less than or equal to any one of the upper limits listed above. The closer the range is to the value in the composite material exemplified in the examples, the more improved the effect can be expected.

[0055] In the above composite material, the plastic plate and the metal plate bonded to each other can exhibit a bonding strength above a certain level.

[0056] For example, the upper limit of the bonding strength between the plastic plate and the metal plate in the composite material is 200, 150, 100, 99, 98, 97, 96, 95, 94, 93, 92, 91, 90, 89, 88, 87, 86, 85, 84, 83, 82, 81, 80, 79, 78, 77, 76, 75, 74, 73, 72, 71, 70, 69, 68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, It can be 48, 47, 46, 45, 44, 43, 42, 41 or 40, and its lower limit is 20.0, 21.0, 22.0, 23.0, 24.0, 25.0, 30.0, 31.0, 32.0, 33.0, 33.1, 33.2, 33.3, 33.4, 33.5, 33.6, 33.7, 33.8, 33.9, 34.0, 34.1, 34.2, 34.3, 34.4, 34.5, 34.6, 34.7, 34.8, 34.9, 35.0, 35.1, 35.2, 35.3Pa. 35.4, 35.5, 35.6, 35.7, 35.8, 35.9, 36.0, 36.1, 36.2, 36.3, 36.4, 36.5, 36.6, 36.7, 36.8, 36.9, 37.0, 37.1, 37.2, 37.3, 37.4, 37.5, 37.6, 37.7, 37.8, 37.9, 38.0, 38.1, 38.2, 38.3, 38.4, 38.5, 38.6, 38.7, 38.8, 38.9, 39.0, 39.1, 39.2, 39.3Pa, It can be about 39.4, 39.5, 39.6, or 39.7. The bonding strength can be measured in the manner described in "Test Example 5" of the present specification, and the unit is MPa. The bonding strength can be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above.The closer the above range is to the value in the composite material exemplified in the example, the more improved effect can be expected.

[0057] In composite materials, the bonding strength between the plastic plate and the metal plate can also be expressed by the shade ratio described later.

[0058] For example, the bonding area of ​​the composite material may exhibit a certain level of shading ratio. The shading ratio can be obtained using the following equation 1.

[0059] [Formula 1]

[0060] G R = 1 - (G a / G u )

[0061] G in Equation 1 R is the shading ratio, and G a is the average of the gray scale in the effective joint area of ​​the joint area between the plastic plate and the metal plate, and G u is the gray scale average of the effective joint area of ​​the reference specimen.

[0062] Average G of the above grayscale a is obtained by irradiating light to the above-mentioned bonding area, and when the irradiated light is reflected by the metal plate of the above-mentioned bonding area, the reflected light is received. In the gray scale graph obtained by the received light, which is obtained by second differentiating the gray scale graph, the point between the highest gray scale and the point with the next highest gray scale or the point between the two highest gray scale points can be designated as the effective bonding surface area, and the average of the gray scale in the effective bonding surface area is G a can be designated as

[0063] The above reflected light can be received after being transmitted through a polarizing plate before being received. This method can prevent the presence of irregularities in the bonding area that are unrelated to the bonding force from causing errors in the grayscale graph.

[0064] In the above, the reference specimen means a specimen in which a plastic plate and a metal plate identical to the composite material are laminated in contact with each other without the above-mentioned joint area.

[0065] The gray-scale average G obtained for these reference specimens u The gray-scale average G obtained for the above-mentioned joint area a The shading ratio G of equation 1 considered with R Silver can represent the bonding strength of the above bonding area.

[0066] G above R , G a and G u A more specific method of obtaining is outlined in “Test Example 6” of this specification.

[0067] The above shade ratio G R It was confirmed that the bonding strength of the bonding area of ​​the above composite material is substantially proportional.

[0068] The above shade ratio G R The lower bound may be about 0.130, 0.135, 0.140, 0.145, 0.150, 0.155, 0.160, 0.165, 0.170, 0.175, 0.180, 0.185, 0.190, 0.195, 0.200, 0.205, or 0.210, and the upper bound may be about 1.0, 0.99, 0.98, 0.97, 0.96, 0.95, 0.94, 0.93, 0.92, 0.91, 0.90, 0.89, 0.88, 0.87, 0.86, 0.85, 0.84, 0.83, It can be about 0.82, 0.81, 0.80, 0.89, 0.88, 0.87, 0.86, 0.85, 0.84, 0.83, 0.82, 0.81. The above G RIt may be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The closer the range is to the value in the composite material exemplified in the embodiment, the more improved effects can be expected.

[0069] The bonding strength or shading ratio G of the above plastic plate and metal plate R , and to ensure excellent confidentiality, several conditions must be met.

[0070] First, in the above composite material, the plastic plate must be molded so that there are no or minimal pores inside and the overall physical properties are uniform.

[0071] Additionally, the surface of the metal plate in contact with the plastic plate must be properly treated.

[0072] In addition, when joining the plastic plate and the metal plate, the process conditions must be controlled according to the properties of the plastic plate and the metal plate.

[0073] The above contents are explained below.

[0074] As described above, in order to form the internal space, the plastic plate may be formed to have a protruding shape. The method for forming the protruding shape in the plastic plate is not particularly limited. For example, the protruding shape may be formed by applying a known plastic forming method such as injection molding, vacuum molding, or press molding. However, in the process of forming the protruding shape in the plastic plate, uneven pressure may be applied to the plastic plate at a high temperature. During this process, pores or air bubbles may be formed inside the plastic plate. If the plastic plate contains a filler component, the likelihood of the formation of the air bubbles or air bubbles may increase. However, in order to secure the airtightness and bonding strength, it is necessary to prevent the formation of air bubbles and air bubbles inside the plastic plate, and therefore the conditions for forming the protruding shape must be considered. In addition, in order to secure the airtightness and bonding strength, the plastic plate itself must have a high and uniform strength, and additionally, the difference in strength between the convex and concave portions of the protruding and concave shape must be small.

[0075] To manufacture such a plastic plate, it is necessary to apply pressure to both the upper and lower portions of the plastic plate during the process of forming the above-mentioned uneven shape. For this purpose, for example, the above-mentioned uneven shape can be formed using a forming method that combines vacuum forming and press forming.

[0076] For example, the above-mentioned uneven shape can be formed by applying pressure to the upper and lower portions of the plastic plate while the plastic plate is heated to a constant temperature.

[0077] In this case, the relationship between the heating temperature and the glass transition temperature of the plastic plate (or the resin component included therein) can be adjusted. For example, when the heating temperature is T and the glass transition temperature is Tg, the upper limit of the absolute value of the temperature deviation calculated by the formula 100×(T-Tg) / Tg may be about 60%, 55%, 50%, 45%, 40%, or 35%, and the lower limit may be about 1%, 5%, 10%, 15%, 20%, 25%, or 30%. The absolute value of the temperature deviation may be within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The deviation may be a positive or negative number. By applying pressure to a heated plastic plate within this range to form a convex shape, a plastic plate with minimized internal pores and uniform strength can be provided. This effect can be further improved as the range approaches the value applied in the example.

[0078] Meanwhile, when applying pressure at the above temperature to form the unevenness, the pressure can be applied simultaneously to the upper and lower portions of the plastic plate. In this case, the magnitude of the pressure applied from the upper portion of the plastic plate is P U , and the size of the eye force applied from below is P L At one time, the equation 100×(P U -P L ) / P LThe upper limit of the absolute value of the pressure deviation calculated by may be about 60%, 55%, 50%, 45%, 40%, 35%, 30%, 28%, 26%, 24%, 22%, or 21%, and the lower limit may be about 1%, 5%, 10%, 15%, or 20%. The absolute value of the pressure deviation may be within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The deviation may be positive or negative. By applying pressure to a heated plastic plate in this range to form a concave-convex shape, a plastic plate having minimized pores inside and having uniform strength can be provided. This effect can be further improved as the range approaches the value applied in the embodiment.

[0079] The above-described forming method is exemplified in the embodiments of this specification. However, the method applicable to implementing the uneven shape is not limited to the above-described method.

[0080] The glass transition temperature Tg of the above plastic plate or the resin component included therein is selected according to the type of plastic plate to be applied, and there is no special limitation thereon. In one example, the lower limit of the glass transition temperature Tg of the plastic plate or the resin component included therein may be about 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, 135°C, 140°C or 145°C, and the upper limit may be about 400°C, 390°C, 380°C, 370°C, 360°C, 350°C, 340°C, 330°C, 320°C, 310°C, 300°C, 290°C, 280°C, 270°C, 260°C, 250°C. It may be about 240°C, 230°C, 220°C, 210°C, 200°C, 190°C, 180°C, 170°C, 160°C, or 150°C. The glass transition temperature Tg may be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and less than or equal to any one of the upper limits listed above.

[0081] The plastic plate formed in this manner can exhibit uniform physical properties overall while having a roughened structure. For example, even when a roughened shape is formed on the plastic plate, the physical properties of the convex and concave portions of the roughened shape can be substantially equivalent. Furthermore, the plastic plate can exhibit uniform strength while having a roughened structure.

[0082] For example, in the plastic plate, the difference between the tensile fracture strength of the concave portion and the tensile fracture strength of the convex portion can be controlled within a predetermined range. The difference between the tensile fracture strength of the concave portion and the convex portion is S Mand the tensile breaking strength of the convex part is S P When it was said that 100×(S P -S M ) / S M It is the absolute value of the value calculated, and its unit is %.

[0083] The upper limit of the deviation of the tensile fracture strength of the convex portion and the concave portion may be about 10%, 9%, 8%, 7%, 6%, 5%, or 4%, and the lower limit may be about 0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, or 3.5%. The deviation of the tensile fracture strength of the convex portion and the concave portion may be within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The closer the range is to the value applied in the embodiment, the more improved the effect may be.

[0084] For example, the lower limit of the tensile fracture strength of the concave portion or the convex portion of the plastic plate or the average (arithmetic mean) of the tensile fracture strength of the concave portion and the tensile fracture strength of the convex portion may be about 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82 or 84, and the upper limit may be about 1000, 950, 900, 850, 800, 750, 700, 650, 600, 550, 500, 450, 400, 350, 300, 250, 200, 150, 100 or 90. The method for measuring the above tensile breaking strength or average is described in "Test Example 2" of the present specification, and the unit thereof is MPa. The above tensile breaking strength or average may be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The closer the above range is to the value applied in the examples, the more improved the effect may be.

[0085] The above plastic plate can exhibit uniform strength overall. When the plate-shaped plastic plate has a side formed in an arbitrary first direction, the standard deviation of the tensile fracture strength of each of the upper part, the middle part, and the lower part obtained by dividing the molded body into three parts in a direction perpendicular to the side in the first direction can be controlled to be below a certain level. The first direction is a direction parallel to any side of the plastic plate confirmed when the plate-shaped plastic plate is observed along the thickness direction of the plastic plate. For example, referring to Fig. 3, if the plastic plate has a rectangular shape as shown in Fig. 3, the direction of the horizontal side (100) or the vertical side (200) of the rectangle can be the first direction. In Fig. 3, the result of dividing the molded body into three parts in a direction perpendicular to the side in the first direction with the vertical side (200) as the first direction and defining the upper part (U), the middle part (M), and the lower part (L) is indicated by a dotted line. In some cases, when the edge of the plastic plate is not in a straight line shape, the direction of an imaginary straight line connecting the two end points of the edge (2001, 2002 in the case of Fig. 3) may be set as the first direction.

[0086] Dividing the plastic plate into three parts along the first direction may mean dividing the plastic plate so that the upper part (U), middle part (M), and lower part (L) have equal areas.

[0087] The above standard deviations are S for the tensile breaking strength of the upper, middle and lower parts, respectively. U , S M and S L , and when the arithmetic mean is A, {[(S U -A) 2 +(S M -A) 2 +(S L -A) 2 ] / 3} 0.5 is the value calculated as .

[0088] For example, the lower limit of the arithmetic mean of the tensile breaking strength of the upper, middle and lower parts of the plastic plate may be about 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 85 or 86, and the upper limit may be about 1000, 950, 900, 850, 800, 750, 700, 650, 600, 550, 500, 450, 400, 350, 300, 250, 200, 150, 100 or 90. The method for measuring the above tensile breaking strength or average is described in "Test Example 3" of the present specification, and the unit thereof is MPa. The above tensile breaking strength may be within a range equal to or greater than any one of the lower limits listed above; or within a range equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The closer the above range is to the value applied in the examples, the more improved the effect may be.

[0089] The upper limit of the standard deviation of the tensile fracture strength of the upper, middle and lower portions of the plastic plate may be about 60, 55, 50, 45, 40, 35, 30, 25, 20, 15, 10, 5, 4.5 or 4, and the lower limit may be about 0, 1.5, 2, 2.5, 3 or 3.5. The standard deviation may be within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The closer the range is to the value applied in the embodiment, the more improved the effect may be.

[0090] By applying these plastic plates, a composite material having the desired bonding strength and airtightness can be provided.

[0091] Additionally, appropriate processing may be performed on the metal plate to secure the above bonding strength and airtightness.

[0092] For example, at least a surface of the metal plate that comes into contact with the plastic plate and forms the bonding area may be surface-treated. A pattern of Per may be formed on the surface of the metal plate that has been surface-treated.

[0093] The term "Per" refers to a shape having a groove and a burr. As used herein, the term "Groove" refers to an area that is recessed downwards based on the average surface of the metal plate in the cross-section of the metal plate, and the term "Burr" refers to an area that is protruded upwards based on the average surface of the metal plate in the cross-section of the metal plate.

[0094] The pattern of the fur may be a pattern formed by a groove on the surface of the metal plate, and the groove may exhibit a linear shape when the metal plate is observed from the surface. The fur may include the groove and the burr when observed in cross section, as exemplarily shown in Fig. 4. The surface of the metal plate, which serves as a reference for distinguishing the groove and the burr, may be the surface of the metal plate before the fur is formed. The cross section of the metal plate in which the groove and the burr are observed is a cross section of the metal plate formed along a direction substantially perpendicular to the linear shape of the fur recognized when the metal plate is observed toward the surface on which the fur pattern is formed. When the line of the fur is not a straight line, the cross section is a cross section of the metal plate formed along the width direction of the groove recognized when the metal plate is observed toward the surface on which the fur pattern is formed.

[0095] At least one surface of the metal plate that comes into contact with the plastic plate may have a pattern of the fur formed thereon.

[0096] For example, the lower limit of the ratio of the area of ​​the metal plate on which the fur pattern is formed based on the total area of ​​the metal plate is 14%, 15%, 15.5%, 15.9%, 16%, 16.05%, 16.1%, 16.15%, 16.2%, 16.25%, 16.3%, 16.35%, 16.4%, 16.45%, 16.5%, 16.55%, 16.6%, 16.65%, 16.7%, 16.75%, 16.8%, 16.85%, 16.9%, 16.95%, 17%, 17.05%, 17.1%, 17.15%, 17.2%, 17.25%, 17.3%, 17.35%, 17.4%, 17.45%, 17.5%, 17.55%, 17.6%, 17.65%, 17.7%, 17.75%, 17.8%, 17.85%, 17.9%, 17.95%, 18%, 18.05%, 18.1%, 18.15%, 18.2%, 18.25%, 18.3%, 18.35%, 18.4%, 18.45%, 18.5%, 18.55%, 18.6%, 18.65%, 18.7%, 18.75%, 18.8%, 18.85%, 18.9%, The ratio may be about 18.95%, 19%, 19.05%, 19.1%, 19.15%, 19.2%, 19.25%, 19.3% or 19.35%, and the upper limit may be about 40%, 35%, 30%, 29.5%, 29%, 28.5%, 28%, 27.5%, 27%, 26.5%, 26%, 25.5%, 25%, 24.5%, 24%, 23.5%, 23%, 22.5%, 22%, 21.5%, 21%, 20.5% or 20%. The ratio is within a range that is greater than or equal to any one of the lower limits listed above; Or within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The closer the range is to the value applied in the embodiment, the more improved the effect may be.

[0097] The lower limit of the ratio of the area of ​​the metal plate on which the fur pattern is formed to the area of ​​the surface of the metal plate in contact with the plastic plate may be about 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 98% or 100%, and the upper limit may be about 100%, 99%, 98%, 97%, 96%, 95%, 94%, 93%, 92%, 91% or 90%. The ratio is within a range that is greater than or equal to any one of the lower limits listed above; Or, it may be within a range that is equal to or greater than any one of the lower limits listed above, while at the same time being less than or equal to any one of the upper limits listed above. The closer the range is to the value applied in the embodiment, the more improved the effect may be.

[0098] Figure 4 is an exemplary drawing of a cross-section of a fur formed on the surface of a metal plate. The depth of the groove, the width of the groove, and the height of the burr in such fur can be adjusted in consideration of the desired bonding strength and airtightness.

[0099] For example, the lower limit of the sum of the burr height and the groove depth may be about 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165 or 170, and the upper limit may be about 180, 175, 170, 165, 160, 155, 150, 145 or 140. The unit of the sum of the burr height and the groove depth is μm. The sum of the burr height and the groove depth may be within a range that is equal to or greater than any one of the lower limits listed above, and at the same time less than or equal to any one of the upper limits listed above. Within this range, the desired bonding strength and airtightness can be more effectively secured. The closer the range is to the value applied in the embodiment, the more improved the effect can be. The height of the burr is the shortest distance between the surface of the metal plate and the most protruding part of the burr, and the depth of the groove is the shortest distance between the surface of the metal plate and the deepest part of the groove. In this case, the surface of the metal plate that serves as the reference for the height and depth may be the surface of the metal plate before the groove is formed.

[0100] For example, the lower limit of the groove depth may be about 50, 60, 70, 80, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145 or 150, and the upper limit may be about 175, 170, 165, 160, 155, 150, 145 or 140. The unit of the groove depth is μm. The groove depth may be within a range that is equal to or greater than any one of the listed lower limits; or within a range that is equal to or greater than any one of the listed lower limits and at the same time less than or equal to any one of the listed upper limits. Within this range, the desired bonding strength and sealing properties can be more effectively secured. The closer the range is to the values ​​applied in the examples, the more improved the effect can be.

[0101] For example, the lower limit of the groove width may be about 50, 70, 90, 110, 130, 150, 160, or 170, and the upper limit may be about 1,000, 900, 800, 700, 600, 500, 400, 300, 200, 190, 180, 170, or 160. The unit of the groove width is μm. The groove width may be within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. In this range, the desired bonding force and airtightness can be more effectively secured. The closer the range is to the value applied in the embodiment, the more improved the effect can be. The width of the above groove is the width at the midpoint of the groove depth.

[0102] For example, the lower limit of the height of the burr may be about 10, 15, 20, 25, 30, 35, 40, 45, or 55, and the upper limit may be about 180, 170, 160, 150, 140, 130, 120, 110, 100, 90, 80, 70, 60, 50, 40, or 30. The unit of the height of the burr is μm. The height of the burr may be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. In this range, the desired bonding strength and airtightness can be more effectively secured. The closer the above range is to the value applied in the example, the more improved the effect may be.

[0103] For example, the lower limit of the ratio (W / D) of the width (W) of the groove to the depth (D) of the groove may be about 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, or 1.3, and the upper limit may be about 2.5, 2.0, 1.9, 1.8, 1.7, 1.6, 1.5, 1.4, 1.3, 1.2, or 1.1. The ratio may be within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. Within this range, the desired bonding strength and sealing properties can be more effectively secured. The closer the range is to the values ​​applied in the examples, the more improved the effect can be.

[0104] For example, the lower limit of the ratio (D / H) of the depth (D) of the groove to the height (H) of the burr may be about 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 3.6, 3.7, 3.8, 3.9, 4.0, 4.1, 4.2, 4.3, 4.4 or 4.5, and the upper limit may be about 6.0, 5.5, 5.4, 5.3, 5.2, 5.1, 5.0, 4.9, 4.8, 4.7, 4.6, 4.5, 4.4, 4.3, 4.2, 4.1, 4.0, 3.9, 3.8 or 3.7. The above ratio may be within a range that is equal to or greater than any one of the lower limits listed above, while simultaneously being less than or equal to any one of the upper limits listed above. Within this range, the desired bonding strength and airtightness can be more effectively secured. The closer the range is to the values ​​applied in the examples, the more improved the effect may be.

[0105] There are no specific limitations on the method for forming the above-mentioned fur pattern on a metal plate. For example, the pattern can be formed by scanning the surface of the metal plate with a laser of appropriate power or by physically scratching it.

[0106] For example, the method of forming the pattern of Per may be a laser processing method. The laser scan speed during laser processing is not particularly limited, but, for example, the lower limit of the scan speed may be about 710, 720, 730, 740, 750, 760, 770, 780, 790, 800, 810, 820, 830, 840, 850, 860, 870, 880, 890 or 900, and the upper limit may be about 1000, 990, 980, 970, 960, 950, 940, 930, 920, 910, 900. The unit of the scan speed is mm / sec. The above speed may be within a range that is equal to or greater than any one of the lower limits listed above, while being less than or equal to any one of the upper limits listed above. Within the above range, a lower scan speed can increase the amount of energy applied for surface treatment, while a higher scan speed can decrease the amount of energy applied. Accordingly, the scan speed can be appropriately adjusted taking into account the desired fur pattern. However, the method for forming the pattern is not limited thereto.

[0107] The shape of the metal plate is not limited. For example, the metal plate may be plate-shaped. As described above, if necessary, the metal plate may also have a roughened shape. There is no particular limitation on the method for imparting the roughened shape to the metal plate. For example, the roughened shape may be formed by appropriately bending or forming the metal plate using a known metal forming method. However, in the process of forming the roughened shape on the metal plate, it may be difficult to ensure airtightness due to the bending portion, etc., and therefore the roughened shape may not be formed on the metal plate.

[0108] The internal space formed in the composite material may form a flow path through which a cooling medium, such as coolant or air, flows, for example.

[0109] The above internal space can be formed, for example, by forming a concave shape on the plastic plate and / or metal plate and joining the plastic plate to the metal plate.

[0110] The composite material having the above bonding strength and airtightness can be obtained by using the plastic plate and metal plate as described above, and can be obtained by bonding the plastic plate and the metal plate using the method described below.

[0111] For example, the method for manufacturing the composite material may include a step of manufacturing a laminate by laminating the plastic plate and the metal plate. In the process, a pattern of the Per may be formed on at least one surface of the metal plate facing the plastic plate and in contact with the plastic plate.

[0112] To manufacture the above composite material, a process of heating and / or pressurizing the laminate of the metal plate and the plastic plate may be performed. The conditions of the heating and / or pressurizing process may be adjusted to ensure the desired sealing and bonding strength.

[0113] For example, the above heating can be performed so as to satisfy the following condition 1.

[0114] [Condition 1]

[0115] A × Tg ≤ T P < Tg < T I < Tm

[0116] T in condition 1 P is the temperature of the plastic plate in the laminate measured during the heating, Tg is the glass transition temperature of the plastic plate or the resin component included in the plastic plate, and T I is the interface temperature of the metal plate and the plastic plate of the laminate measured during the heating, and Tm may be the melting temperature of the metal plate.

[0117] In condition 1, A is any number, for example, 0.35, 0.4, 0.45, 0.5, 0.55 or 0.6.

[0118] Temperature T of the plastic plate of the laminate measured during the heating as specified in Condition 1 P is controlled to be greater than or equal to A × Tg but less than Tg.

[0119] Temperature T of condition 1 P is adjusted according to the glass transition temperature Tg of the applied plastic plate or resin component. For example, the temperature T P The lower limit may be about 50℃, 52.5℃, 55℃, 57.5℃, 60℃, 62.5℃, 65℃, 67.5℃, 70℃, 72.5℃, 75℃, 77.5℃, 80℃, 82.5℃, 85℃, 87.5℃ or 90℃, and the upper limit may be about 200℃, 195℃, 190℃, 185℃, 180℃, 175℃, 170℃, 165℃, 160℃, 155℃, 150℃, 145℃, 130℃, 135℃, 130℃, 120℃, 125℃, 110℃, 105℃, 100℃, 95℃ or It can be around 90℃. The above temperature T P It may be within a range that is greater than or equal to any one of the lower limits listed above; or within a range that is less than or equal to any one of the upper limits listed above; or within a range that is greater than or equal to any one of the lower limits listed above and less than or equal to any one of the upper limits listed above. The closer the range is to the value applied in the embodiment, the more improved the effect may be.

[0120] The glass transition temperature (Tg) of the above plastic plate or the resin component contained therein is selected depending on the type of plastic plate to be applied, and there are no special restrictions thereon. In one example, the glass transition temperature of the above plastic plate may be applied in the same manner as described above.

[0121] In the heating process satisfying condition 1, the above T P The ratio of Tg to Tg / T P can be adjusted. For example, the ratio Tg / T P The upper limit of the ratio Tg / T may be about 2.5, 2.4, 2.3, 2.2, 2.1, 2, 1.9, 1.8, 1.7 or 1.65, and the lower limit may be about 1, 1.1, 1.2, 1.3, 1.4, 1.5 or 1.6. P It may be within a range that is greater than or equal to any one of the lower limits listed above; or within a range that is less than or equal to any one of the upper limits listed above; or within a range that is greater than or equal to any one of the lower limits listed above and less than or equal to any one of the upper limits listed above. The closer the range is to the value applied in the embodiment, the more improved the effect may be.

[0122] The interface temperature T of the metal plate and the plastic plate measured during heating under condition 1 I is determined by the glass transition temperature Tg and the melting temperature Tm. In one example, the temperature T IThe lower limit may be about 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, or 180°C, and the upper limit may be about 300°C, 290°C, 280°C, 270°C, 260°C, 250°C, 240°C, 230°C, 220°C, 210°C, 200°C, 190°C, or 180°C. The interface temperature may be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The closer the above range is to the value applied in the example, the more improved the effect can be.

[0123] In the case where condition 1 is satisfied, T for the above Tg I The ratio of T I / Tg can be further adjusted. For example, the above ratio T I The lower limit of / Tg may be about 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, or 1.1, and the upper limit may be about 3.0, 2.9, 2.8, 2.7, 2.6, 2.5, 2.4, 2.3, 2.2, 2.1, 2.0, 1.9, 1.8, 1.7, 1.6, 1.5, 1.4, 1.3, or 1.2. The ratio TI / Tg may be within a range that is equal to or greater than any one of the listed lower limits; within a range that is less than or equal to any one of the listed upper limits; or within a range that is equal to or greater than any one of the listed lower limits and less than or equal to any one of the listed upper limits. The closer the above range is to the value applied in the example, the more improved the effect can be.

[0124] The melting temperature of the above metal plate is adjusted depending on the type of metal and is determined based on the unique melting temperature Tm of the metal plate. In one example, the melting temperature of the above metal plate can be applied in the same manner as described above.

[0125] In the case where condition 1 is satisfied, the above T I The ratio of Tm to Tm / T I This can be adjusted. For example, the above Tm / T I The lower limit of may be about 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7 or 7.5, and the upper limit may be about 50, 45, 40, 35, 30, 25, 20, 15, 10, 9, 8, 7, 6, 5 or 4. The ratio Tm / T I It may be within a range that is greater than or equal to any one of the lower limits listed above; or within a range that is less than or equal to any one of the upper limits listed above; or within a range that is greater than or equal to any one of the lower limits listed above and less than or equal to any one of the upper limits listed above. The closer the range is to the value applied in the embodiment, the more improved the effect may be.

[0126] Maintaining the above conditions during the heating process effectively produces the desired composite material. While the reason is unclear, it is believed that adjusting the temperature to satisfy Condition 1 optimizes the melting state and / or fluidity of the plastic and / or metal plates, thereby producing a composite material with the desired sealing and bonding strength and no external deformation. Furthermore, the same effects can be achieved when producing the composite material on a large scale.

[0127] There are no limitations on the method for satisfying the above conditions during the heating process. For example, a method of applying heat from the top and / or bottom of the laminate may be used. As long as Condition 1 is satisfied, heat may be applied from either the top or bottom. However, to more effectively satisfy the above conditions, it is advantageous to apply the heat from the top and bottom of the laminate.

[0128] The heat described above can be applied using known heaters, such as ceramic heaters or coil heaters. For example, when a plastic plate is positioned on the upper side and a metal plate is positioned on the lower side, the upper heater can be positioned to heat the plastic plate and the lower heater can be positioned to heat the metal plate, and the upper and lower heaters can be operated simultaneously. Also, for example, when a metal plate is positioned on the upper side and a plastic plate is positioned on the lower side, the upper heater can be positioned to heat the metal plate and the lower heater can be positioned to heat the plastic plate, and the upper and lower heaters can be operated simultaneously.

[0129] In the above manufacturing method, the pressurization may be performed separately after the heating as described above, or may be performed simultaneously with the heating.

[0130] There are no specific restrictions on the method of applying this pressure. For example, a method of applying pressure to the plastic and metal plate laminate using an appropriate mold or other means may be used. In this case, pressure may be applied only to areas of the laminate where the convex portion is not formed, or to areas where the plastic and metal plates are in direct contact, by adjusting the shape of the mold, for example.

[0131] This pressurization may be performed simultaneously on the upper and lower portions of the laminate, for example, or may be performed only on the upper or lower portions of the laminate.

[0132] There is no special limitation on the size of the pressure (P1) applied during the above pressurization. The pressure can be adjusted to an appropriate level depending on the purpose. For example, the lower limit of the pressure (P1) may be about 1000, 1500, 2000, 3000, 4000, 5000, 6000, 7000, 7500, 7600, 7700, 7800, 7900, 8000, 8100, 8200, 8300, 8400, 8500, 8600, 8700, 8800, 8850, 8900, 8950, 9000, 8950, 9000, 9050, 9100, 9150 or 9200, and the upper limit may be about. 11000, 10950, 10900, 10850, 10800, 10750, 10700, 10650, 10600, 10550, 10500, 10450, 10400, 10350, 10300, 10250, 10200, 10150, 10100, 10050, 10000, 9950, 9900, 9850, 9800, 9750, 9700, 9650, 9600, 9550, 9500, 9450, 9400, 9350, 9300, 9250, or 9200 It can be a degree. The unit of the above pressure is gf / cm 2 The applied pressure (P1) during the pressurization may be within a range that is equal to or greater than any one of the lower limits listed above; within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and less than or equal to any one of the upper limits listed above. The closer the range is to the value applied in the embodiment, the more improved the effect may be.

[0133] The time of the above pressurization is also determined according to the purpose and is not greatly limited. For example, the lower limit of the pressurization time may be about 10 seconds, 20 seconds, 30 seconds, 40 seconds, 41 seconds, 42 seconds, 43 seconds, 44 seconds, 45 seconds, 46 seconds, 47 seconds, 48 ​​seconds, 49 seconds or 50 seconds, and the upper limit may be about 3600 seconds, 3400 seconds, 3200 seconds, 3000 seconds, 2800 seconds, 2600 seconds, 2400 seconds, 2200 seconds, 2000 seconds, 1800 seconds, 1600 seconds, 1400 seconds, 1200 seconds, 1000 seconds, 800 seconds, 600 seconds, 400 seconds, 200 seconds, 100 seconds, 85 seconds, 80 seconds, 75 seconds, 70 seconds. It can be about 65 seconds, 60 seconds, 55 seconds, or 50 seconds. The pressurization time can be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and less than or equal to any one of the upper limits listed above. The pressurization time can also be appropriately adjusted depending on the pressure applied during the pressurization, etc.

[0134] As described above, the heating and pressurization can be performed simultaneously or sequentially.

[0135] For example, the heating and pressurizing may be performed in a manner including a first step of heating the laminate of the plastic plate and the metal plate and a second step of pressurizing the laminate.

[0136] In the above case, the second step can be performed in a state that satisfies the condition 1. For example, the heating in the first step can be performed so as to satisfy the condition 1, and the second step can be started while maintaining this state.

[0137] The method for manufacturing the above composite material may additionally include a step of cooling the laminate following the heating and pressurizing process.

[0138] Conditions in the cooling process can be adjusted to produce the desired composite material. For example, the cooling process can also be performed while applying a certain level of pressure to the laminate.

[0139] For example, the cooling process can be performed under pressurized conditions in which △P of Equation 5 below falls within a predetermined range. For example, the cooling process can be performed in a state in which the pressure applied to the laminate following the heating and pressurizing process (or the second step) is adjusted so that △P of Equation 5 below falls within a predetermined range. In one example, the upper limit of △P can be about 600%, 550%, 500%, 450%, 400%, 350%, 310%, or 300%, and the lower limit can be about 50%, 100%, 150%, 200%, 250%, 290%, or 300%. The △P is within a range that is equal to or greater than any one of the lower limits listed above; or is less than or equal to any one of the upper limits listed above; Or, it may be within a range that is equal to or greater than any one of the lower limits listed above, while at the same time being less than or equal to any one of the upper limits listed above. The closer the range is to the value applied in the embodiment, the more improved the effect may be.

[0140] [Formula 5]

[0141] △P = 100 × (P2 - P3) / P3

[0142] In Equation 5, P2 is the pressure applied to the laminate during the pressurization process before cooling (e.g., the second step), and P3 is the pressure applied to the laminate during the cooling process. The P2 may be, for example, the same as the range of the pressure P1 applied during the pressurization described above.

[0143] The above cooling of the laminate may be natural cooling or forced cooling. Natural cooling is performed while maintaining the laminate at a low temperature (e.g., room temperature), and forced cooling may be performed by contacting the laminate with an appropriate cooling medium (e.g., cooling water).

[0144] The above-mentioned process can be used to manufacture the composite material. The method for manufacturing the composite material may additionally include any steps necessary for the above-mentioned process. For example, the method may additionally include a step of desorption after the cooling process.

[0145] As described above, in the composite material, the plastic plate and the metal plate can provide an internal space with secured airtightness while exhibiting excellent bonding strength.

[0146] These internal spaces may form channels through which a cooling medium, such as coolant or air, flows. These channels may be designed so that, when the cooling medium is applied, the cooling medium can effectively exchange heat with the heating element.

[0147] For example, the internal space of the joint interface between the plastic plate and the metal plate forms a path through which a fluid can move, and in this case, the joint surface between the plastic plate and the metal plate can be formed to include an external joint surface existing outside the path and a plurality of internal joint surfaces existing inside the path.

[0148] The term internal joint surface refers to a region where the plastic plate and the metal plate are joined, and is formed so that the fluid can be divided by the joined region and then rejoined during the process of moving the fluid through the passage.

[0149] The term outer joint surface refers to an area where the plastic plate and the metal plate are joined, and is not the inner joint surface.

[0150] The above bonding surface is described with reference to Fig. 5.

[0151] Fig. 5 is a schematic diagram of the composite material observed from the front (e.g., in a direction perpendicular to the normal direction of the surface of the plastic plate), in which the internal joint surface (500) and the external joint surface (600) are indicated by hatching, and the portion not indicated by hatching is the flow path (internal space).

[0152] As illustrated by arrows in Fig. 5, in a form like Fig. 5, the fluid can be injected into the inlet (In), move through the flow path, and then be discharged again through the outlet (Out).

[0153] Looking at the drawing, it can be seen that the fluid encounters the inner joint surface (500) during the movement process, is divided by the inner joint surface (500), and then rejoins within the flow path, but the outer joint surface does not perform this function.

[0154] Such fluid can move through the path while in contact with the metal plate.

[0155] In one example, the passage (internal space) may be formed so that the fluid injected into the joint interface between the plastic plate and the metal plate is discharged after moving an area equal to or greater than a certain percentage of the total area of ​​the metal plate (or plastic plate). This means, for example, that the area of ​​the passage occupies a certain percentage or greater of the area of ​​the metal plate. For example, the lower limit of the ratio of the area of ​​the passage (AF) to the area of ​​the metal plate (AM) (100×AF / AM) may be about 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, or 80%, and the upper limit may be about 99%, 97%, 95%, 93%, 91%, 89%, 87%, 85%, 83%, or 81%. The above ratio (100×AF / AM) is equal to the ratio of the area of ​​the metal plate (or plastic plate) through which the fluid injected into the joint interface between the plastic plate and the metal plate moves to the area of ​​the metal plate (or plastic plate). The ratio may be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The larger the ratio, the more effectively the fluid can exchange heat. However, the larger the ratio, the smaller the area of ​​the joint surface between the plastic plate and the metal plate, and in such a case, it is not easy to secure excellent bonding strength, etc. However, the composite material disclosed in the present specification can secure high bonding strength between the plastic plate and the metal plate and airtightness of the internal space (flow path) while securing the ratio of 100×AF / AM as much as possible.

[0156] As illustrated in Fig. 5, the internal bonding surface (500) is formed within the flow path, and the density of the internal bonding surface (500) can be controlled to enable effective heat exchange. The density of the internal bonding surface is a ratio of the number of internal bonding surfaces formed within the flow path to the total area of ​​the flow path. The lower limit of the density of the internal bonding surface may be about 10, 15, 20, 25, 30, 35, 40, 45, 50, 51, 52, 53, or 54, and the upper limit may be about 500, 450, 400, 350, 300, 250, 200, 150, 100, 95, 90, 85, 80, 75, 70, 65, 60, or 55. The unit of the density is number / m 2 The density may be within a range that is greater than or equal to any one of the lower limits listed above; or within a range that is greater than or equal to any one of the lower limits listed above and at the same time less than or equal to any one of the upper limits listed above. The internal bonding surface formed with the density may enable the fluid moving through the passage to effectively scan the entire area of ​​the passage, thereby enabling stable and efficient heat exchange. As the range of this ratio approaches the value in the composite material exemplified in the embodiment, a more improved effect can be expected.

[0157] The above internal joint surface can be designed so that R1 of the following equation 2 is within a certain range.

[0158] [Formula 2]

[0159] R1 = A1 / A2

[0160] In Equation 2, A1 is the total area of ​​the above-mentioned euro, A2 is the sum of the areas of the multiple internal joint surfaces (total area), and the units of A1 and A2 are the same.

[0161] The lower limit of R1 in Equation 2 may be about 2, 4, 6, 8, 10, 12, 14, 16, 18, or 20, and the upper limit may be about 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35, 30, 25, 23, or 21. R1 may be within a range that is equal to or greater than any one of the lower limits listed above; within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and less than or equal to any one of the upper limits listed above. The internal bonding surface formed to satisfy the above R1 range can enable the fluid moving through the flow path to effectively scan the entire area of ​​the flow path, thereby enabling stable and efficient heat exchange. As this ratio range approaches the values ​​of the composite materials exemplified in the examples, further improved effects can be expected.

[0162] The above internal joint surface can be designed so that R2 of the following equation 3 is within a certain range.

[0163] [Formula 3]

[0164] R2 = A1 / A3

[0165] In Equation 3, A1 is the total area of ​​the above-mentioned euro, and A3 is the area of ​​a single internal joint surface (a single internal joint surface). For example, if the areas of multiple internal joint surfaces are not constant, A3 may be the arithmetic mean of the areas of the multiple internal joint surfaces. The units of A1 and A3 are the same.

[0166] The lower limit of R2 in Equation 3 may be about 95, 100, 110, 120, 130, 140, 150, 160, or 165, and the upper limit may be about 500, 450, 400, 350, 300, 250, 200, 190, 180, or 175. The R2 may be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and less than or equal to any one of the upper limits listed above. The internal bonding surface formed to satisfy the range of R2 may enable a fluid moving in the passage to effectively scan the entire area of ​​the passage, thereby enabling stable and efficient heat exchange. The closer the range of these ratios is to the values ​​in the composite materials exemplified in the examples, the more improved effects can be expected.

[0167] The above internal joint surface can be designed so that R3 in Equation 4 below is within a certain range.

[0168] [Formula 4]

[0169] R3 = L 2 / A3

[0170] In Equation 4, L is the spacing between multiple internal joint surfaces, and A3 is the area of ​​a single internal joint surface (one internal joint surface).

[0171] In the above, the square of L and the unit of A3 are the same.

[0172] In the above, the spacing between the multiple internal joint surfaces is the spacing between the centers of adjacent internal joint surfaces (e.g., L1 and L2 in Fig. 5). For example, if there is no other internal joint surface on the imaginary line connecting the centers of any two internal joint surfaces, the two internal joint surfaces can be said to be adjacent to each other. In another example, if a fluid flows through a flow path and is divided by one of the internal joint surfaces, then rejoins, and then there is an internal joint surface where it meets, the two internal joint surfaces can be said to be adjacent to each other. Meanwhile, the center of the internal joint surface in the above refers to the center of gravity. In addition, when the spacing between the internal joint surfaces is multiple and not constant, Equation 5 applies the smallest spacing among the multiple spacings, the longest spacing among the multiple spacings, or the arithmetic mean of the multiple spacings.

[0173] The lower limit of R3 in Equation 4 may be about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, or 14, and the upper limit may be about 50, 45, 40, 35, 30, 25, 20, 15, 14, 13, 12, 11, 10, 9, or 8. R3 may be within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is less than or equal to any one of the upper limits listed above; or within a range that is equal to or greater than any one of the lower limits listed above and less than or equal to any one of the upper limits listed above. The internal bonding surface formed to satisfy the above R3 range can enable the fluid moving through the flow path to effectively scan the entire area of ​​the flow path, thereby enabling stable and efficient heat exchange. As this ratio range approaches the values ​​of the composite materials exemplified in the examples, further improved effects can be expected.

[0174] The above internal joint surface can be designed so that R4 of the following formula 5 is within a certain range.

[0175] [Formula 5]

[0176] R4 = A1 / T 2

[0177] In Equation 5, T is the thickness of the above-mentioned euro, and A1 is the total area of ​​the euro.

[0178] In the above, the square of T and the unit of A1 are the same.

[0179] The lower limit of R4 in Equation 5 may be about 5,000, 5,500, 6,000, 6,500, 7,000 7,500, 8,000, 8,500 or 9,000, and the upper limit may be about 50,000, 45,000, 40,000, 35,000, 30,000, 25,000, 20,000, 15,000, 10,000, 9,500 or 9,200. The R4 is within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is less than or equal to any one of the upper limits listed above; Or, it may be within a range that is equal to or greater than any one of the lower limits listed above, and at the same time less than or equal to any one of the upper limits listed above. The internal bonding surface formed to satisfy the range of R4 can move while effectively scanning the entire area of ​​the path at an appropriate speed, thereby enabling stable and efficient heat exchange. The closer the range of this ratio approaches the value in the composite material exemplified in the embodiment, the more improved the effect can be expected.

[0180] The shape of the above internal joint surface is not particularly limited, and can be formed into various shapes as long as the fluid flowing through the path can be appropriately divided and then recombined as described above.

[0181] In the above composite material, the ratio (AT / AA) of the total area (AT) of the composite material to the total area (AA) of the outer and inner joint surfaces can be adjusted. For example, the lower limit of the ratio (AT / AA) can be about 1.5, 2, 2.5, 3, 3.5, 4, 4.5, or 5, and the upper limit can be about 50, 45, 40, 35, 30, 25, 20, 15, 10, 9.5, 9, 8.5, 8, 7.5, 7, 6.5, 6, or 5.5. The ratio is within a range that is equal to or greater than any one of the lower limits listed above; or within a range that is less than or equal to any one of the upper limits listed above; Alternatively, it may be within a range that is equal to or greater than any one of the lower limits listed above, while simultaneously being less than or equal to any one of the upper limits listed above. The closer this ratio range is to the values ​​in the composite materials exemplified in the examples, the more improved effects can be expected.

[0182] A flow path designed to satisfy the above conditions can effectively perform heat exchange while allowing the fluid moving within it to effectively scan the entire area of ​​the flow path at an appropriate speed. However, such a design may make it difficult to ensure efficient bonding between the plastic and metal plates.

[0183] The present specification also discloses uses of the composite material. For example, the composite material can be used as a so-called heat sink. As is known, a heat sink is a component that can absorb or dissipate heat from another object through direct or indirect thermal contact. Since such a heat sink advantageously has a large surface area, a composite material comprising a plastic plate with a roughened shape and a surface-treated metal plate, as described above, can be advantageously used as a heat sink.

[0184] The heat sink may include a plate-shaped plastic plate having a roughened shape, like the composite material described above. In addition, it may include a metal plate having a Per pattern formed thereon, like the composite material described above. The content of the plastic plate, for example, the content of the resin component and the filler component, the absolute value of the difference in tensile fracture strength between the concave and convex portions, the standard deviation of the tensile fracture strength of each of the upper, middle, and lower portions, the thickness of the plate-shaped plastic plate, etc., may be equally applied to the content described above. In addition, the content of the metal plate, for example, the content of the Per pattern, the thickness of the metal plate, the melting temperature, etc., may be equally applied to the content described above.

[0185] In addition, the heat sink, like the composite material described above, can be applied in the same manner as described above in terms of the maximum allowable internal pressure, the pressure drop rate, the 60-second drop amount, and the pressure drop level LP according to Equation 1.

[0186] The present specification also discloses a device comprising the composite material.

[0187] For example, the device may include the composite material and a cooling medium. The cooling medium may be present in a flow path of the composite material or may be prepared to be injected into the flow path.

[0188] The above device may be a cooling device such as, for example, the aforementioned heat sink or thermal interface material (TIM).

[0189] The type of the above cooling medium is not particularly limited, and for example, a cooling liquid such as water or a gas such as air can be applied.

[0190] The device may also include a heating element and the composite material. The device may also include the heating element and the cooling device. In this case, the composite material and the heating element may be in thermal contact. As used herein, the term "thermal contact" refers to contact in which heat from the heating element can be transferred to the composite material, and does not necessarily mean that they are physically in contact with each other.

[0191] The type of the above-mentioned heating element is not particularly limited. A heating element may be any type of component, element, or device that generates heat during operation or storage and requires that such heat be controlled. Examples of such heating elements include, but are not limited to, battery cells, battery modules, or battery packs.

[0192] For example, the device may further comprise a cooling medium. The cooling medium may be present in the path of the composite material or may be prepared to be injected into the path.

[0193] The present specification discloses a composite material and its use. The composite material, for example, may be a composite material in which a metal plate and a plastic plate are bonded together, and an internal space exists at the bonding interface between the metal plate and the plastic plate. According to the disclosure herein, when the composite material is used as a heat-dissipating material (e.g., a heat sink) through which a fluid, such as a cooling medium, moves, the internal space can be designed so that the fluid can perform stable and effective heat exchange with a heating element, etc. Furthermore, according to the disclosure herein, high airtightness can be secured in the internal space so that the heat exchange performance can be maintained without loss over the long term. According to the disclosure herein, even when the composite material is manufactured on a large area or large scale, it can exhibit durability due to the excellent heat exchange performance and airtightness. The present specification also discloses uses of the composite material.

[0194] Figure 1 is a drawing showing one example of a cross-section of a composite material.

[0195] Figure 2 is an exemplary process for forming the composite material of Figure 1.

[0196] Figure 3 is an exemplary process for dividing a plastic plate into three parts.

[0197] Figure 4 is an exemplary drawing for explaining Per.

[0198] Figure 5 is an exemplary drawing for explaining the shape and joint surface of the euro.

[0199] Figure 6 is a drawing explaining the process of forming a plastic plate with a rough shape.

[0200] Figure 7 is a drawing explaining the process of forming a plastic plate with a rough shape.

[0201] Figure 8 is a drawing for explaining a laser processing area performed in an embodiment.

[0202] Figure 9 is an SEM image of a plastic plate with a rough shape manufactured in an example.

[0203] Figure 10 is an SEM image of a plastic plate with a rough shape manufactured in an example.

[0204] Figure 11 is a drawing explaining the process of collecting a sample from a plastic plate.

[0205] Figure 12 is a drawing derived from the process of evaluating the airtightness of an internal space.

[0206] Figure 13 is a drawing derived from the process of evaluating the airtightness of an internal space.

[0207] Figure 14 is a drawing for explaining a specimen for measuring tensile breaking strength.

[0208] Figure 15 is a diagram showing the process of evaluating the shade ratio.

[0209] Figure 16 is a drawing showing an example of the evaluation results in gray scale.

[0210] Figure 17 is a diagram showing the result of differentiating the graph of Figure 16.

[0211] Figure 18 is a drawing showing the relationship between the shading ratio and the bonding force.

[0212] The composite material and the like are described in detail through the following examples and comparative examples, but the scope of the composite material and the like is not limited to the following examples.

[0213]

[0214] Example 1

[0215] Plastic plate manufacturing

[0216] A plastic plate (100) having a convex shape (1001) and a concave shape (1002) as shown in Fig. 1 was manufactured.

[0217] The above convex and concave shapes (1001, 1002) were adjusted so that a flow path of the shape shown in Fig. 5 was formed after the plastic plate was bonded to the metal plate. The total area of ​​the flow path formed according to Fig. 5 was approximately 146,180 mm 2 The total area of ​​the external joint surface (600) is approximately 29,308 mm 2 The total area of ​​the internal joint surface (500) is approximately 7,050 mm 2 The above convex and concave shapes (1001, 1002) were formed to a degree. The internal joint surfaces (500) were designed to have a total of eight within the euro, and each internal joint surface (500) had the same area, and the area of ​​a single internal joint surface was approximately 881.26 mm. 2 The gap between adjacent internal joint surfaces was formed to be approximately 78.38 mm (L2 in Fig. 5) or 114.45 mm (L1 in Fig. 5). In addition, the total area of ​​the plastic plate confirmed from the front after forming the uneven shape was approximately 182,538 mm 2 In addition, the concave shape (1002) was formed to have a depth of approximately 4 mm.

[0218] A plastic plate (fabric) having a rectangular plate shape, a horizontal length of about 610 mm, a vertical length of about 308 mm, and a thickness of about 2 mm was prepared. The fabric was manufactured by applying a material in which mPPO (Modified PPO (Polyethylene oxide)) and glass fiber were mixed in a weight ratio of 8:2 (mPPO: filler component) to an extrusion process. The mPPO, which is a resin component, had a glass transition temperature (Tg) of about 145°C. The glass fiber used had a cross-sectional diameter of about 12.5 μm and an aspect ratio of about 24.

[0219] The above glass transition temperature was measured using a Differential Scanning Calorimeter (DSC 8000, Perkin Elmer (USA)). The temperature range during the measurement was from 40℃ to 350℃, and the glass transition temperature was measured while checking the heat flow change in the heating and cooling mode with a heating and cooling rate of 10℃. The sample used for the measurement was weighed to have a diameter of approximately 2 mm and a weight of approximately 10 mg.

[0220] As shown in Fig. 6, the fabric (1000) was positioned on a first mold (2000) having a negative shape corresponding to the desired uneven shape. A second mold (3000) having a positive shape corresponding to the uneven shape was positioned on top of the fabric (1000).

[0221] The temperature of the surface of the fabric (1000) was maintained at approximately 195°C using a ceramic heater. The ceramic heater was located inside a temperature-raising device, and the temperature was raised to the target temperature through temperature control of a PLC (Programmable Logic Controller) system while the ceramic heater was positioned on top of the fabric. Whether the surface temperature of the fabric was controlled to the target temperature was confirmed using a non-contact infrared thermometer.

[0222] Then, while maintaining the above temperature, suction (L) was performed at the bottom of the first mold (2000) as shown in FIG. 6, and the second mold (3000) was moved downward to apply pressure to the fabric (1000) in the form as shown in FIG. 7.

[0223] The above suction (L) was performed by opening the gauge of the equipment 100%. The vacuum flow based on the rate is approximately 1 atm, and the pressure applied to the fabric is approximately 690.2 gf / cm 2 (approved load is approximately 1500 kg). The pressing force of the second mold (3000) is approximately 548.7 gf / cm on the molded body formed through the suction. 2 (Approved load: approximately 1000 kg) pressure was applied.

[0224] After maintaining the above condition for about 10 seconds, the temperature of the fabric (1000) was reduced to about 40°C to perform a cooling process. After the cooling process, the first and second molds (2000, 3000) were separated, and the plastic plate, which is the molded body, was recovered.

[0225]

[0226] Metal sheet manufacturing

[0227] An aluminum plate (melting temperature of approximately 660.3°C) in the shape of a rectangular plate, with a horizontal length of approximately 610 mm, a vertical length of approximately 308 mm, and a thickness of approximately 3 mm was prepared. The melting temperature of the aluminum plate was measured under the same conditions and with the same equipment as those used to measure the glass transition temperature of the mPPO.

[0228] The surface of the metal plate was laser-treated to form a Per pattern. The laser treatment was performed only on the portion of the metal plate's surface that would come into contact with the plastic plate during the manufacture of the composite material. The area where the laser treatment was performed corresponds to the hatched area in Fig. 8. The area of ​​the hatched area is approximately 36358.42 mm 2 It was about that level.

[0229] The above laser treatment was performed using a laser irradiation device (50W Fiber marking machine, K2 Laser) having a fiber source. The surface of the metal plate was treated by irradiating the laser with the laser irradiation device. The laser irradiation was performed by cross-scanning (mesh form) the surface treatment surface at a scan rate of approximately 850 mm / sec, and the number of scans for the same surface was 4. The laser output was approximately 50 W, and the laser irradiation was performed at a repetition rate of approximately 70 kHz.

[0230] By the above treatment, a per was formed on the surface of the metal plate as shown in Fig. 4. Fig. 4 is a shape confirmed when observing a cross-section of the treated aluminum plate (a surface observed when cutting along the normal direction of the surface of the aluminum plate). As shown in Fig. 4, the per included a burr and a groove. The width of the groove was approximately 150 μm, the depth of the groove was approximately 110 to 120 μm, and the height of the burr was approximately 30 μm.

[0231]

[0232] Composite material manufacturing

[0233] The prepared plastic plate (100) and metal plate (200) were laminated in the form shown in Fig. 1 and bonded through heating and pressurization to manufacture a composite material.

[0234] The above bonding was performed using a device (BG-200 (Modified), Sungshin Hydraulic Machinery) that can form a sealed internal space, heat the internal space, control the pressure of the internal space to pressurize the laminate in a heated state, and also enable cooling. The laminate was positioned in the internal space of the device (BG-200 (Modified). The plastic plate (100) of the laminate was positioned on the upper side, and the metal plate (200) was positioned on the lower side.

[0235] In the above state, the laminate was heated (heating process). Heating was performed by simultaneously operating the upper heater located on the plastic plate (100) side of the laminate and the lower heater located on the metal plate (200) side. The heating was performed by operating the temperature (T) of the plastic plate (100) P ) is about 90℃, and the interface temperature (T) of the plastic plate (100) and the metal plate (200) I ) was performed until the temperature reached approximately 180°C. The temperature (T) of the plastic plate (100) P ) was measured by cross-checking using a TC (Thermal couple) built into the device (BG-200 (Modified) and a non-contact infrared thermometer, and the interface temperature (T) of the plastic plate (100) and the metal plate (200) I ) was confirmed by placing a thermometer (terminal couple) directly on the interface.

[0236] When the temperature of the upper heater was set to 90°C and the temperature of the lower heater was set to 180°C and the operation was started, when about 1400 seconds had passed from the time of operation, the temperature (T) of the plastic plate (100) P ) and the above interface temperature (T I ) was confirmed.

[0237] Temperature (T) of the plastic plate (100) P ) and interface temperature (T I) At the point where the temperature was reached, the pressure in the sealed internal space of the equipment was adjusted to pressurize the laminate (pressurization process). Pressurization was performed by applying a load by pressing a plastic plate using a mold. At this time, the pressurization was about 9,200 gf / cm 2 (Applied load: approximately 20 tons) was applied to the laminate. During the pressurization, only the joint of the laminate (the surface-treated portion of the plastic plate (100) and the metal portion (200)) was applied.

[0238] The above pressurization is achieved by heating the temperature (T) of the plastic plate (100) P ) and interface temperature (T I ) was maintained for approximately 50 seconds.

[0239] After the above pressurization, a cooling process was performed (cooling process).

[0240] The above cooling process was performed by flowing cooling water around the enclosed space. Cooling was performed by applying a pressure of about 2300 gf / cm to the laminate. 2 (approved load of about 5 tons) was reduced, and the temperature of the laminate (temperature of the plastic plate (100) (T) P ) and interface temperature (T I )) was performed until the temperature was approximately 60°C or lower. After cooling, the laminate was detached and the composite material was recovered.

[0241]

[0242] Example 2

[0243] The interface temperature (T) of the plastic plate (100) and the metal plate (200) in the heating and pressurizing process I ) was prepared in the same manner as in Example 1, except that the conditions were adjusted to be approximately 160°C.

[0244]

[0245] Example 3

[0246] A composite material was manufactured in the same manner as in Example 1, except that the scanning speed of the laser was changed to approximately 800 mm / sec when processing the metal plate, so that the width of the groove of the per was approximately 150 μm, the depth was approximately 140 μm, and the height of the burr was approximately 30 μm.

[0247]

[0248] Example 4

[0249] A composite material was manufactured in the same manner as in Example 1, except that a SUS 304 plate (melting temperature: approximately 1400°C) having a rectangular plate shape with a width of approximately 610 mm, a length of approximately 308 mm, and a thickness of approximately 3 mm was subjected to laser processing to form a pattern of Per having a groove with a width of approximately 150 μm, a depth of approximately 130 μm, and a burr with a height of approximately 30 μm.

[0250]

[0251] Comparative Example 1

[0252] A composite material was manufactured in the same manner as in Example 1, except that a SUS 304 plate (melting temperature: approximately 1400°C) having a rectangular plate shape with a horizontal length of approximately 610 mm, a vertical length of approximately 308 mm, and a thickness of approximately 3 mm was subjected to laser processing to form a pattern of Per having a groove with a width of approximately 150 μm, a depth of approximately 95 μm, and a burr with a height of approximately 10 μm.

[0253]

[0254] Comparative Example 2

[0255] A composite material was manufactured in the same manner as in Example 1, except that the scanning speed of the laser was adjusted when processing the metal plate so that the width of the groove of the Per was approximately 150 μm, the depth was approximately 155 μm, and the height of the burr was approximately 30 μm.

[0256]

[0257] Comparative Example 3

[0258] A composite material was manufactured in the same manner as in Example 1, except that the scanning speed of the laser was adjusted during processing of the metal plate so that the width of the groove of the per was approximately 150 μm, the depth was approximately 95 μm, and the height of the burr was approximately 10 μm.

[0259]

[0260] Test Example 1.

[0261] The cross-sections of the plastic plates of Example 1 and the reference plastic plates were photographed using a Scanning Electron Microscope (SEM) (JEOL, JSM-7800F model) to evaluate the presence or absence of pores. The plastic plates were cross-section-treated using a TXP pretreatment device and then photographed using the SEM device. The reference plastic plate is a plastic plate in which a concave-convex structure is formed in the same manner as in Example 1, but without pressurizing by the upper mold. The BED-C observation mode was applied during the photographing, and the magnification, working distance, and acceleration voltage were 100x, 15 mm (Working Distance), and 15.0 kV, respectively. Figure 9 shows the results for the plastic plate of Example 1, and Figure 10 shows the results for the reference plastic plate. Through Figures 9 and 10, it can be confirmed that almost no pores were observed inside the plastic plate applied in Example 1, whereas a large number of pores exist inside the reference plastic plate.

[0262]

[0263] Test Example 2.

[0264] The tensile breaking strength of the convex and concave shapes of the plastic plate of Example 1 and the reference plastic plate of Test Example 1 was evaluated. Fig. 11 is a photograph of the front of the plastic plate. As shown in Fig. 11, the concave shape (rectangle filled with hatched lines in Fig. 11) and the convex shape (rectangle filled with dots in Fig. 11) of the plastic plate were each cut to manufacture specimens. The specimens were cut using a water jet process, and the specimens were formed to have a horizontal length of about 45 mm and a vertical length of about 12.5 mm. As indicated by the rectangles in Fig. 11, a total of 32 specimens were obtained from the convex shape, and a total of 17 specimens were obtained from the concave shape.

[0265] The tensile breaking strength of the specimen was measured at room temperature (approximately 25°C) using a Universal Testing Machine (UTM). Approximately 8 mm from each transverse end of the specimen was fixed to the device, and the strength (tensile breaking strength) at the point of specimen fracture was measured while uniaxially stretching the specimen in the transverse direction (parallel to the two ends). The stretching was performed at a constant velocity of approximately 50 mm / sec.

[0266] The above measurement results are summarized and described in Table 1 below.

[0267] Convex shape (MPa) Concave shape (MPa) Deviation (%) Example 181.8284.91 Approximately 3.8 Standard plastic plate 44.5245.61 Approximately 2.4

[0268] The deviation (%) in Table 1 is the tensile fracture strength S of the concave shape. M and tensile fracture strength S of convex shape P The equation is 100×(S M -S P ) / S P This is the result calculated by substituting it into .

[0269]

[0270] Test Example 3.

[0271] The plastic plate of Example 1 and the reference plastic plate of Test Example 1 were divided into three equal lengths in the vertical direction (arrow direction of Fig. 11) and manufactured into upper, middle, and lower specimens. The tensile breaking strength of each section was then evaluated in the same manner as in Test Example 2. The specimens were cut using a water jet process.

[0272] As shown in Fig. 11, specimens were obtained from the convex shape (rectangle filled with dots in Fig. 11) and concave portion (rectangle filled with hatched lines in Fig. 11) of the plastic plate, and specimens were obtained from the upper, middle, and lower portions in the same manner as described above. When cutting the specimens, the specimens were cut so that the TD (Transverse direction) direction of the plastic plate was horizontal. The TD direction is the direction based on the extrusion process for manufacturing the fabric.

[0273] Using the above method, four specimens (a total of eight specimens) were collected from each of the convex and concave shapes of the upper part, and specimens were collected in the same manner from the middle and lower parts.

[0274] For the above specimens, the tensile breaking strength was evaluated in the same manner as in Test Example 2, and the results are summarized and presented in Table 2.

[0275] The unit of tensile breaking strength in Table 2 below is MPa, which is the average value of tensile breaking strength measured for specimens taken from the upper, middle, and lower parts, respectively.

[0276] In addition, the standard deviation in Table 2 below is the tensile breaking strength S of the upper part. U , tensile breaking strength S of the intermediate section M , tensile breaking strength S at the lower part L The formula {[(S U -A) 2 +(S M -A) 2 +(SL -A) 2 ] / 3} 0.5 The value obtained by substituting it into the above equation is A. In the above equation, S U , S M and S L is the arithmetic mean.

[0277] S U S M S L A Standard Deviation Example 18981.8290.7587.193.86 Standard Plastic Plate 53.9644.5273.3757.2812.01

[0278] Test Example 4.

[0279] The airtightness of the composite material was evaluated. A constant pressure was applied to the internal space formed by the bonding of the concave shape (1002) of the plastic plate (100) of the composite material and the metal plate (200), and the airtightness was evaluated by observing the tendency of the pressure to be maintained or decreased.

[0280] In the above composite material, there is an internal space formed by the joining of the plastic plate (100) and the metal plate (200), and this internal space is sealed by the joining portion of the plastic plate (100) and the metal plate (200). However, there are two passages communicating with the outside in the internal space, and one of the two passages is sealed by attaching a jig equipped with a rubber ring gasket. In addition, another passage is also sealed by attaching a jig equipped with a rubber ring gasket, and air can be injected into the passage.

[0281] Confidentiality was assessed in the following order:

[0282] Step 1: Inject air until the pressure in the internal space of the composite material reaches the target pressure;

[0283] Step 2: Stabilize by injecting air so that the target pressure is maintained and stabilized for 20 seconds from the time of starting to inject air;

[0284] Step 3: After Step 2, stop the air injection and check for a drop in pressure.

[0285]

[0286] Figure 12 shows the results of the airtightness evaluation for the composite material of Example 1. Figure 12 shows the airtightness evaluation performed while gradually increasing the target pressure in steps 1 to 3 to 0.5 bar, 1 bar, 1.5 bar, 2 bar, 2.5 bar, and 3.0 bar.

[0287] That is, steps 1 to 3 were first performed on the composite material with the target pressure set to 0.5 bar. Thereafter, steps 1 to 3 were sequentially performed on the composite material with the target pressure set to 1 bar. The same process was repeated while increasing the target pressure by 0.5 bar to 1.5 bar, 2 bar, 2.5 bar, and 3.0 bar.

[0288] Referring to Fig. 12, when the above process is performed, the pressure of the internal space is stably maintained for about 80 seconds up to the target pressure of 2.5 bar, but when the airtightness evaluation is performed with the target pressure as 3.0 bar, it can be confirmed that the internal pressure is not maintained as the pressure decreases rapidly when the internal pressure becomes 2.8 bar. It appears that this decrease in pressure is caused by the bonding destruction of the bonding interface between the plastic plate and the metal plate of the composite material. From these results, it can be confirmed that the maximum allowable internal pressure of the composite material of Example 1 is within the range of 2.5 bar or more and less than 2.8 bar. In the evaluations for Examples 2 and 3, the maximum allowable internal pressure was also confirmed to be within the range of 2.5 bar or more and less than 2.8 bar.

[0289] Fig. 13 is a result of confirming the pressure drop pattern within the internal space after stopping the injection of air following step 2 of the above confidentiality evaluation process. Since the result of Fig. 13 is a trend in step 3, 0 seconds on the x-axis of Fig. 13 is 20 seconds on the x-axis of Fig. 12. The y-axis of Fig. 13 is the pressure drop rate per unit time (unit: Pa / sec) at the corresponding point on the x-axis.

[0290] The results of the above confidentiality assessment are summarized and described in Table 3 below.

[0291] In Table 3, the standard is for a composite material formed in the same manner as Example 1, but the result is that the standard plastic plate of Test Example 1 is applied as the plastic plate of the composite material.

[0292] Example Comparative Example 123412 Standard P12.52.52.52.51.51.01.5Prate5.757.266.975.916.583.985.36P20.00340.00430.00420.00350.00390.00240.0032Q0.1360.1720.1680.140.260.240.21

[0293] In Table 3, P1 is the maximum allowable internal pressure obtained according to the above measurement, and its unit is bar; Prate is the pressure drop rate, and its unit is Pa / sec; P2 is the pressure drop per 60 seconds, and its unit is bar; and Q is the pressure reduction level, and its unit is %.

[0294] The P1 (maximum allowable internal pressure) in the above Table 3 is the maximum pressure that can maintain the target pressure for about 60 seconds or more from the time when the air injection is stopped when the airtightness evaluation is performed while gradually increasing the target pressure in steps 1 to 3 from 0.5 bar in increments of 0.5 bar in the order of 0.5 bar, 1 bar, 1.5 bar, 2 bar, 2.5 bar, and 3.0 bar. Here, maintaining the target pressure means that the pressure measured in bar is kept substantially constant. For example, in the case of Examples 1 to 4, when the target pressure was set to 2.5 bar, the pressure (bar) was maintained for about 60 seconds, but when it was set to 3.0 bar, a rupture occurred when it exceeded 2.8 bar, so the maximum allowable pressure was set to 2.5 bar. Meanwhile, the maximum allowable pressure of Comparative Example 3 was at the level of 1 to 1.5 bar.

[0295] Prate (pressure drop rate) describes the rate and level of pressure decrease from the point at which air injection was stopped (air was injected to maintain and stabilize the target pressure for 20 seconds in Step 2 above, and then the air injection was stopped immediately after stabilization). This rate was measured by injecting air up to the maximum allowable internal pressure (P1) for each composite material and then stopping the air injection immediately after the stabilization, and was evaluated through the pressure decrease until the point at which the pressure decrease no longer occurred.

[0296] In Table 3, the 60-second pressure drop P2 is the difference (P2-P60) between the maximum allowable internal pressure (P1) and the internal pressure (P60) at the point in time when 60 seconds have passed since the air was cut off during the process of evaluating the pressure drop rate.

[0297] The pressure reduction level Q in Table 3 is the result obtained by substituting the maximum allowable internal pressure P1 and the 60-second pressure drop P2 into the equation 100×{1-(P1-P2) / P1}.

[0298]

[0299] Test Example 5.

[0300] The bonding strength between the plastic plate and the metal plate was evaluated for the composite materials of the examples or comparative examples. The bonding strength was evaluated by cutting each composite material to produce a measurement specimen in the shape of Fig. 14. The specimen of Fig. 14 is a laminate of a plastic plate (100) and a metal plate (200) obtained from a composite material, and the length of the bonded portion in the specimen (part B of Fig. 14) is approximately 9 mm, the length of the portion of the non-bonded plastic plate (100) and metal plate (200) (parts A and C of Fig. 14) is approximately 36 mm, and the width of the specimen is approximately 12.5 mm. In cases where it is difficult to cut a specimen in the shape of Fig. 14 from the composite material, the same plastic plate and metal plate as in the production of each composite material were applied, and the same bonding method was applied to produce a specimen in the shape of Fig. 14, and the evaluation was performed.

[0301] The bonding strength of the above specimen was evaluated. The bonding strength evaluated in this test example was measured in a manner corresponding to the measurement method of the so-called tensile shear strength. The bonding strength was measured at room temperature (approximately 25°C) using a UTM (Universal Testing Machine, Zwick / roell Z030) device. After fixing the protruding portions of the metal plate (200) and the plastic plate (100) of the specimen as shown in Fig. 14 (the portions indicated by A and C in Fig. 14) to the device, the bonding strength was evaluated while peeling the plastic plate (100) from the metal plate (200). The peeling was performed at a peeling angle of approximately 180 degrees (parallel between the metal-plastic material portions) and a peeling speed of approximately 50 mm / min. The evaluation results are summarized in Tables 4 and 5 below. The unit of the bonding strength in Tables 4 and 5 is MPa.

[0302] Example 1234 Bonding strength 41.438.43939.2

[0303] Comparative Example 123 Bonding Strength 28.329.728.5

[0304] Test Example 6.

[0305] A specimen was manufactured by cutting the joint portion of the metal plate and plastic plate of the composite material of Example 1. The specimen was manufactured to have a horizontal length of approximately 12.5 mm and a vertical length of approximately 9 mm.

[0306] Next, as shown in Fig. 15, the specimen was placed on a stand (S) having an inclination of angle A. The metal plate (200) of the specimen was positioned closer to the stand (S) than the plastic plate (100). The angle A was approximately 30 degrees. Thereafter, as shown in Fig. 15, light was incident on the surface of the plastic plate (100) of the specimen using a light source (L) at an incident angle of approximately 30 degrees (A1 in Fig. 15).

[0307] As the above light source (L), an LED light emitting infrared light with a wavelength of approximately 1550 nm was used.

[0308] When light incident from a light source (L) was reflected by a metal plate (200), the reflected light was received by a NIR (Near Infrared) camera (N). A NIR (Near Infrared) polarizing plate (Edmund Optics, #12-475) (P) was positioned in the path of the reflected light, so that the reflected light was transmitted through the polarizing plate and then received by the NIR camera (N). The NIR polarizing plate (P) and the NIR camera (N) were positioned so that the reflected light was transmitted and received at an angle of about 30 degrees (angle B in Fig. 15) based on the plane of the measurement specimen. The distance from the light source to the light incident point of the measurement specimen (L1 in Fig. 15) was set to approximately 11 cm, the distance from the reflection point to the polarizing plate (P) (L2 in Fig. 15) was set to approximately 15 cm, and the distance from the polarizing plate (P) to the camera (N) (L3 in Fig. 15) was set to approximately 2 cm. As the NIR camera (N), Aval Global's ABA-003VIR was used.

[0309] By shooting in this manner, the ABA-003VIR provides a grayscale evaluation result as shown in Fig. 16. In Fig. 16, the pixels on the x-axis correspond to each point in the horizontal direction of the specimen. That is, for example, the 0 point of the pixels on the x-axis in Fig. 16 corresponds to the leftmost point in the horizontal direction of the measured specimen, and the 80 point may correspond to the rightmost direction in the horizontal direction.

[0310] Using the Origin program, if the grayscale graph as in Fig. 16 is differentiated for the second time, a grayscale graph as in Fig. 17 can be obtained. In the obtained second differentiation result, the point between the two highest grayscale points (or the highest and second highest grayscale points) is designated as the valid interface, and the average value of the graph within the valid interface is obtained as G a was saved.

[0311] A separate reference specimen was manufactured. The reference specimen was manufactured by simply laminating the cut plastic and metal plates, each approximately 12.5 mm in length and 9 mm in width, using the same plastic and metal plates used in the examples. That is, the heating, pressurizing, and cooling processes were not performed on the reference specimen. The lamination was performed so that the laser-treated surface of the metal plate was in contact with the plastic plate.

[0312] For the above reference specimen, a grayscale graph is obtained using ABA-003VIR in the same manner as the above measurement specimen, and a second-differentiated grayscale graph is obtained using the Origin program. Then, in the second-differentiated result, the point between the two highest grayscale points (or the highest grayscale point and the next highest grayscale point) is designated as the effective joint surface, and the average value of the graph within the effective joint surface is obtained to obtain G u was saved.

[0313] The grayscale average value G obtained above is shown in Table 6 below. a and G u And the above average value is expressed as formula G R =1-G a / G u The shading ratio G obtained by substituting Rwas organized and recorded.

[0314] Table 6 shows the total of three G tests for the composite material of Example 1. a , G u and G R It measures and presents the results.

[0315] Example 1 No. 1 No. 2 No. 3 Gu 129.8 129.8 129.8 Ga 104.2 9 103.9 1103.4 G R 0.1960.1990.203

[0316] Figure 18 shows the shading ratio G for each composite material. R This is a graph that summarizes the relationship between the results measured and the bonding force compared to each other. From Fig. 18, the shading ratio G R It can be confirmed that the bonding force and the shading ratio are proportional to each other. In the graph of Fig. 18, when the shading ratio is x and the bonding force is y, the two have a relationship of approximately y = 273.13 x - 16.015, and R 2 It was confirmed that the consistency between the data and the trend line was high, with a value of approximately 0.8727.

Claims

1. Contains a bonded plastic plate and a metal plate, A fur pattern is formed on the surface of the metal plate that comes into contact with the plastic plate. The above fur includes a groove formed downward and a burr protruding upward based on the surface of the metal plate, A composite material in which the sum of the height of the burr and the depth of the groove is within a range of 110 to 180 μm.

2. In paragraph 1, either one or both of the plastic plate and the metal plate have a rough shape, A composite material in which an internal space is formed by the uneven shape at the joint interface between the plastic plate and the metal plate.

3. A composite material in which the ratio of the area of ​​the metal plate on which the Per pattern is formed to the area of ​​the metal plate in contact with the plastic plate in the first paragraph is 70% or more.

4. A composite material in which the ratio of the depth of the groove to the height of the burr is within the range of 1.0 to 6 in the first paragraph.

5. A composite material in which the ratio of the groove width to the groove depth in the first paragraph is within the range of 0.5 to 2.

5.

6. A composite material in which the height of the burr is 10 μm or more in the first paragraph.

7. A composite material according to claim 1, wherein the depth of the groove is 50 μm or more.

8. In the first paragraph, a composite material in which the plastic plate has a side formed in the first direction, and the average value of the tensile breaking strength of each of the upper part, the middle part, and the lower part obtained by dividing the plastic plate into three parts in a direction perpendicular to the side in the first direction is 60 MPa or more, and the standard deviation of the tensile breaking strength of each of the upper part, the middle part, and the lower part is 10 or less.

9. In the first paragraph, the plastic plate has a concave-convex shape, and the average of the tensile breaking strength of the concave area and the convex area of ​​the concave-convex shape is 50 MPa or more, and the deviation of the tensile breaking strength of the concave area and the convex area is 10% or less. A composite material.

10. In the second paragraph, the internal space forms a path through which a fluid can move, The joint surface of the plastic plate and the metal plate is a composite material including an external joint surface existing outside the passage and a plurality of internal joint surfaces existing inside the passage.

11. In the 10th paragraph, the internal joint surface is a composite material formed so that the fluid can be recombined after being divided by the internal joint surface during the movement of the fluid.

12. In the 10th paragraph, a composite material in which R1 of the following formula 2 is within a range of 2 to 90 and R2 of the following formula 3 is within a range of 95 to 500: [Formula 2] R1 = A1 / A2 [Formula 3] R2 = A1 / A3 In equations 2 and 3, A1 is the total area of ​​the euro, A2 is the total area of ​​the internal joints, and A3 is the area of ​​a single internal joint.

13. In the 10th paragraph, a composite material in which R3 of the following formula 4 is in the range of 1 to 50: [Formula 4] R3 = L 2 / A3 In Equation 4, L is the spacing between the internal joint surfaces, and A3 is the area of ​​a single internal joint surface.

14. A composite material in which the ratio of the total area (AT) of the composite material to the total area (AA) of the external and internal joint surfaces (AT / AA) is within a range of 1.5 to 50 in the 10th paragraph.

15. A method for manufacturing a composite material by bonding a plastic plate and a metal plate, It includes a step of heating and pressurizing the laminate of the plastic plate and the metal plate, A method for manufacturing a composite material in which the above heating is performed to satisfy the following condition 1: [Condition 1] 0.35 × Tg ≤ T P < Tg < T I < Tm T in condition 1 P is the temperature of the plastic plate of the laminate measured during the heating, Tg is the glass transition temperature of the resin component of the plastic plate, and T I is the interface temperature of the metal plate and the plastic plate measured during the heating, and Tm is the melting temperature of the metal plate.

16. In the 15th paragraph, T for Tg of condition 1 P The ratio of Tg / T P A method for manufacturing a composite material by performing heating so that the temperature becomes 2 or less.

17. In the 15th paragraph, the pressure is 7000 to 11000 gf / cm 2 A method for manufacturing a composite material performed under pressure within a range of .

18. In paragraph 15, the heating and pressurizing process is A first step of heating a laminate of a plastic plate and a metal plate; and A method for manufacturing a composite material, comprising a second step of pressurizing the laminate following the first step.

19. A method for manufacturing a composite material, wherein the second step is performed in a state that satisfies condition 1 in paragraph 18.

20. In paragraph 16, a step of cooling the laminate is additionally performed following the heating and pressurizing process, The above cooling is performed under the condition that △P of the following equation 5 is 200% to 400%, a method for manufacturing a composite material: [Formula 5] △P = 100 × (P2 - P3) / P3 In Equation 5, P2 is the pressure applied to the laminate in the pre-cooling pressurization process, and P3 is the pressure applied to the laminate in the cooling process.

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