KR20170058112A - Film laminate and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a method of laminating a laminate having a polyolefin resin film inserted between two metal plates, which can dramatically improve the adhesion between a metal plate and a film, and can realize excellent dimensional stability, and a method for manufacturing the film laminate .

Description

[0001] FILM LAMINATE AND MANUFACTURING METHOD THEREOF [0002]

The present invention relates to a film laminate and a method of producing the same. More particularly, the present invention relates to a method for laminating a laminate having a polyolefin resin film interposed between two metal plates, thereby remarkably improving the adhesion between the metal plate and the film, and realizing excellent dimensional stability, and a method for producing the laminate .

The lamination process is applied to various fields as a method of covering the surface of a metal material by thermally pressing a resin film, i.e., a film for lamination, on the surface of a metal plate. Such a lamination process is preferable from the viewpoint of environmental friendliness because it generates less waste gas such as a solvent that occurs during drying as compared with a method of forming a resin coating film by applying and drying a resin composition on the surface of a metal material, It is advantageous in that waste of raw materials can be suppressed as compared with a general resin coating film formed by applying and drying the resin composition, pinhole occurrence is small, and workability is excellent. It is applied to aluminum steel plate, steel steel plate, aluminum foil for packing or stainless steel foil, and it is widely used for containers such as food cans and battery containers.

However, as shown in FIG. 3, the roll-type laminator mainly used in the lamination process is not uniformly distributed in the adhesive force of the laminate produced according to the condition of the roll, Curl or wrinkle occurs when the right and left pressures of the rolls are different, resulting in a problem that the dimensional stability is remarkably deteriorated. Further, when there is a step or irregularity on the surface of a substrate such as a metal plate, a uniform pressure can not be applied, so that a difference in adhesion may partially occur. Accordingly, there is a demand for development of a film laminate manufacturing technique capable of realizing excellent dimensional stability while reducing adhesive force deviation so as to have a uniform adhesive force throughout the film laminate to be manufactured.

An object of the present invention is to provide a film laminate in which a high adhesive force is uniformly distributed throughout the laminate, curls and wrinkles are not generated, film thickness retention characteristics are excellent, and dimensional stability is excellent.

Another object of the present invention is to provide a method for manufacturing a film laminate capable of drastically reducing adhesive force variation throughout the film laminate and maximizing dimensional stability.

According to an aspect of the present invention, there is provided a method of manufacturing a polyolefin resin film, comprising the steps of: placing a laminate having a polyolefin resin film inserted between two metal plates on a lower substrate in a vacuum chamber having an upper substrate, a rubber plate, A vacuum step of converting the inside of the chamber into a vacuum state so as to surround the laminated body while the rubber plate positioned on the lower side moves, and a pressing step of releasing the vacuum state of the upper part of the chamber with respect to the rubber plate so as to apply pressure to the laminated body ≪ / RTI >

In the method for manufacturing a film laminate according to an embodiment of the present invention, the vacuum step may be performed at 80 to 200 ° C for 5 to 120 minutes.

In the method for manufacturing a film laminate according to an embodiment of the present invention, the pressing step may be performed at 80 to 200 ° C for 5 to 120 minutes.

The method of manufacturing a film laminate according to an embodiment of the present invention may further include an aging step of allowing the film laminate having been subjected to the pressing step to stand at 100 to 140 DEG C for 12 to 48 hours.

In the method for producing a film laminate according to an embodiment of the present invention, the polyolefin resin film may comprise 30 to 95% by weight of a polyolefin resin and 5 to 70% by weight of a polyamide resin.

At this time, the polyolefin resin may have a melt index (190 DEG C, 2160 g) of 0.3 to 60 g / 10 min and a density of 0.80 to 0.95 g / cm < 3 >. The polyamide resin may be a copolymer of nylon 6, nylon 66, nylon 46, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon 6/66/610 copolymer, nylon MXD6, nylon 6T , Nylon 6 / 6T copolymer, nylon 66 / PP copolymer, nylon 66 / PPS copolymer, 6-nylon methoxymethylate, 6-610-nylon methoxymethylate and 612-nylon methoxymethylate Or a mixture of two or more thereof.

In the method for manufacturing a film laminate according to an embodiment of the present invention, the metal plate may be at least one selected from stainless steel, aluminum, copper, zinc plating, metal plate, cold-rolled metal plate, color metal plate, pickled metal plate and corrosion-

The present invention provides a film laminate produced by the above-described production method.

The film laminate according to the present invention is a laminate obtained by laminating a metal plate on both sides of a polyolefin resin film, characterized in that the adhesive force between the film and the metal plate is 15 kgf / inch or more and satisfies the adhesive force variation range of the following formula (1).

(Equation 1)

(In the formula 1, X _i is the adhesive strength at the i-th measurement in the measurement interval of 10 to 240 mm, m is the average value of the adhesive force within the measurement interval, and n is the number of times of the adhesion force measurement at the interval. , And 60% RH) at a rate of 50 mm / min.

In the film laminate according to one embodiment of the present invention, the polyolefin resin film may comprise 30 to 95% by weight of the polyolefin resin and 5 to 70% by weight of the polyamide resin.

In the film laminate according to one embodiment of the present invention, the polyolefin resin may have a melt index (190 DEG C, 2160 g) of 0.3 to 60 g / 10 min and a density of 0.80 to 0.95 g / cm < 3 >.

In the film laminate according to one embodiment of the present invention, the polyamide resin is a copolymer of nylon 6, nylon 66, nylon 46, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon 6/66 / 610 copolymer, nylon MXD6, nylon 6T, nylon 6 / 6T copolymer, nylon 66 / PP copolymer, nylon 66 / PPS copolymer, 6-nylon methoxymethylate, 6-610- nylon methoxymethyl Cargo and a methoxymethylated product of 612-nylon, or a mixture of two or more thereof.

In the film laminate according to an embodiment of the present invention, the metal plate may be at least one selected from the group consisting of stainless steel, aluminum, copper, zinc plating, metal plate, cold-rolled metal plate, color metal plate, pickled metal plate and corrosion-

The film laminate according to an embodiment of the present invention is characterized in that the film thickness retention ratio before and after the laminating process is 92% or more.

The film laminate according to the present invention has an advantage that the adhesion between the metal plate and the film can be enhanced, and physical properties excellent in moldability and durability can be realized.

In addition, the film laminate according to the present invention has an advantage that the adhesive force is uniformly distributed over the whole, the thickness of the inserted film between the metal plates is constant, and excellent dimensional stability can be realized.

The present invention is also advantageous in that it is possible to provide a method of manufacturing a film laminate capable of drastically reducing adhesive force variation across the substrate to be laminated, maximizing dimensional stability, and improving productivity of a high quality film laminate .

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 schematically illustrates the interior of a laminate vacuum chamber with a pre-laminate.
Figure 2 schematically illustrates a vacuum step according to one embodiment of the present invention.
Figure 3 shows a good example and a bad example of the condition of the roll in the lamination process.

Hereinafter, the film laminate of the present invention and the method for producing the same will be described in detail with reference to preferred embodiments. However, this is not intended to limit the scope of protection defined by the claims. In addition, technical terms and scientific terms used in the description of the present invention have the meanings as commonly understood by those of ordinary skill in the art to which the present invention belongs, unless otherwise defined.

The inventors of the present invention have made it possible to distribute the adhesive force uniformly throughout the laminate by performing the lamination process in which the prepared laminate to be laminated is subjected to a vacuum and pressure process, that is, And it is possible to maximize the molding processability, the durability and the dimensional stability by reducing the variation of the film thickness retention rate without causing warpage or wrinkles. Thus, the present invention has been completed.

In the present invention, the term " film laminate " means a sandwich metal plate having a resin film inserted between two metal plates, which means that metal is laminated on both sides of the film. In particular, the term " film laminate " is used to substitute for a "metal plate laminate" having the same meaning because the film is used as a main component, while realizing the physical properties of the existing sandwich steel sheet and lighter weight.

Hereinafter, each configuration according to an embodiment of the present invention will be described in more detail.

The present invention

A preparation step of placing a laminate in which a polyolefin resin film is interposed between two metal plates, on a lower substrate in a vacuum chamber having an upper substrate, a rubber plate and a lower substrate,

A vacuum step of converting the inside of the chamber into a vacuum state so that the rubber plate located at the lower part surrounds the laminate while the upper substrate moves downward;

A pressing step of releasing the vacuum state of the upper part of the chamber with respect to the rubber plate and applying pressure to the laminated body

≪ RTI ID = 0.0 > a < / RTI > film laminate.

In the present invention, a laminate is formed by inserting a polyolefin resin film between two metal plates, which is laminated by a structure of a metal plate / polyolefin resin film / metal plate, and is integrated through a lamination process. At this time, the polyolefin resin film can be used without limitation as long as it is a resin for a metal plate laminate, and may be a film comprising a polyolefin resin alone or a modified polyolefin resin.

The polyolefin resin film may preferably include a polyolefin resin and a polyamide resin in consideration of the mechanical properties of the film laminate as well as the weight and economy of the film laminate. Specifically, it is preferable that 30 to 95% by weight of the polyolefin resin and 5 to 70% by weight of the polyamide resin, more preferably 60 to 95% by weight of the polyolefin resin and 5 to 40% by weight of the polyamide resin, It is good in terms of mechanical properties. It is better. When the above-mentioned range is satisfied, it is possible to maximize the dimensional stability while reducing the adhesive property and the rate of film thickness change by combining with the lamination process according to the present invention.

Examples of the polyolefin resin include, but are not limited to, polyethylene homopolymer, polypropylene homopolymer, polyethylene and (C3-C10) alpha olefin copolymer, polypropylene and (C3-C10) alpha olefin copolymer, polyethylene and polypropylene Or a mixture of polyethylene and polypropylene. More preferably, the melt index (190 DEG C, 2160 g) is 0.3 to 60 g / 10 min, and the density is 0.80 to 0.95 g / cm3. Specifically, a low density polyethylene (LDPE), a linear low density polyethylene (LLDPE), a very low density polyethylene (VLDPE), a super low linear density polyethylene (VLLDPE) and a high density polyethylene (HDPE) having a melt index (190 DEG C, 2160 g) of 0.3 to 60 g / ) And a propylene (PP) resin. The polyolefin resin may be one having a density of 0.80 to 0.95 g / cm 3. It is possible to provide a film excellent in adhesiveness with a metal plate and light weight in a range where the melt index and density satisfy the above range.

The polyolefin resin may preferably be a modified polyolefin resin in which an ethylenically unsaturated carboxylic acid, a carboxylate, anhydride or an ester derivative monomer is grafted in order to further improve adhesion to a metal plate , But is not limited thereto.

The polyamide resin is used for imparting lighter weight while realizing excellent mechanical properties. Preferably, the polyamide resin is a polyamide resin which is used for imparting lighter weight, and more preferably a nylon 6, nylon 66, nylon 46, nylon 11, nylon 12, nylon 610, nylon 612, Nylon 66 / PP copolymers, nylon 66 / PPS copolymers, methoxymethylates of 6-nylon, 6-610 copolymers, nylon 6/66/610 copolymers, nylon MXD6, nylon 6T, nylon 6 / 6T copolymers, -Methoxymethylate of nylon, and methoxymethylate of 612-nylon may be used, but not always limited thereto.

In the present invention, the metal plate is not particularly limited, but any one or more selected from stainless steel, aluminum, copper, zinc plating, metal plate, cold rolled metal plate, colored metal plate, pickled metal plate and corrosion-

The above-mentioned polyolefin resin film has an adhesive force of 5 kgf / inch or more, preferably 8 kgf / inch or more, to the metal plate. When the above-mentioned range is satisfied, it is possible to prevent the phenomenon that the metal plate is bent to process the metal plate or the film and the metal plate are separated from each other during press forming.

The modulus of the polyolefin resin film may be 35 kgf / cm 2 or more. When the physical properties are satisfied, the film laminate according to the present invention is advantageously applied to various fields such as building materials and automobile materials.

The polyolefin resin film may be formed as a single layer, but is not limited thereto and may have a multilayer structure.

The preparation step in the present invention is to mount a preliminary laminate in which the above-mentioned polyolefin resin film is inserted between two metal plates in a laminate chamber capable of performing a lamination process. 1, the laminate chamber comprises an upper substrate 11 fixed to the upper substrate support 12, a lower substrate 41 fixed to the lower substrate support 42, and a rubber plate 21 , And a gas inlet / outlet unit is formed on the upper substrate support 12 and the lower substrate support 42 to control the pressure. At this time, the rubber plate 21 is a kind of sealing material, and any material can be used as long as it can adhere to the laminate under a vacuum pressure condition in the chamber.

In the present invention, the vacuum step is performed by converting the pressure into vacuum in the laminate chamber, and the preliminary laminate 31 (the first metal plate 32 / the second metal plate 32), which is placed on the lower substrate 41, The polyolefin resin film 33 / the second metal plate 34). More specifically, as can be seen from FIG. 2, in the vacuum process, the upper substrate 11 is lowered while the vacuum is applied to the chamber, and the rubber plate 21 located at the lower portion of the upper substrate 11 is brought into contact with the preliminary laminate The rubber plate 21 pushes the metal plates 32 and 34 and the film 33 naturally outward while lowering the lower pressure than the upper pressure in separating the upper and lower pressures in the chamber with respect to the rubber plate So that the preliminary laminate 31 as a lamination target can be wrapped. Such a process can remove foreign matter such as air bubbles between the metal plate and the film in the preliminary laminate and the lower substrate, between the preliminary laminate and the rubber plate, and in the preliminary laminate while converting the pressure inside the chamber to a vacuum state.

The vacuum process is preferably carried out at 80 to 200 ° C, preferably 140 to 180 ° C. When the process temperature is lower than 80 ° C, adhesion between the polyolefin resin film and the metal plate is difficult. When the temperature exceeds 200 ° C, it is difficult to maintain the thickness of the polyolefin resin film and the thickness is excessively decreased. Further, the vacuum process time is preferably 5 to 60 minutes.

In addition, the vacuum step can be adjusted without limitation as long as the pressure is such that the vacuum state can be maintained inside the reaction chamber.

After the completion of the vacuum step, a pressing step of releasing the vacuum state of the upper part of the chamber with respect to the rubber plate and applying pressure to the laminate is carried out. When the upper vacuum state is released, atmospheric pressure is applied from the upper surface of the rubber plate. At the same time, vacuum is applied to the lower portion of the chamber, and pressure is applied to the laminate due to the pulling force. This pressing step is carried out in a temperature range of from 80 to 200 DEG C, preferably from 40 to 180 DEG C in the vacuum step, and the pressing time is from 5 to 120 minutes. It is preferable that the temperature and the process time range are satisfied in order to achieve the intended effect of the present invention.

The laminate obtained by completing the pressing step may be further subjected to an aging step. At this time, the aging process is carried out at a temperature of 100 to 140 ° C, preferably 120 to 130 ° C for 12 to 48 hours, so that a uniform adhesive force can be achieved throughout the film laminate to be produced, good. Such an aging process can improve the initial adhesion of the laminate up to the pressing step and can be further carried out in accordance with the initial adhesion force.

The present invention provides a film laminate produced by the above-described production method.

The film laminate according to the present invention is a laminate obtained by laminating a metal plate on both sides of a polyolefin resin film, characterized in that the adhesive force between the film and the metal plate is 15 kgf / inch or more and satisfies the adhesive force variation range of the following formula (1).

(Equation 1)

X _i is the adhesive strength at the i-th measurement in the measurement range of the peeling distance of 10 to 240 mm, m is the average value of the adhesive force within the measuring interval, and n is the number of times of measuring the adhesive force within the interval. At this time, the adhesive strength was the adhesive strength when peeling the sample (width 25.4 mm, length 250 mm) at a rate of 50 mm / min under conditions of 25 캜 and 60% RH.

The adhesive strength variation range is more preferably 0.87 kfg / inch, which is more preferable for dimensional stability and moldability.

In addition, the film laminate has a film thickness retention ratio of 92% or more, which is a film thickness change ratio before and after the lamination process.

The film laminate is applied to various fields such as a building material and an automobile exterior material to be applied as a metal plate, thereby realizing mechanical properties similar to a metal plate, as well as being excellent in dimensional stability, molding processability and durability, .

Hereinafter, the present invention will be described in detail with reference to the following examples. However, the present invention is not limited to the following examples.

The physical properties of the present invention were measured as follows.

(1) Adhesion and adhesive force variation

After the film was laminated, the adhesive force between the film and the metal plate was measured by a Peel Test method using a measuring instrument (Instron 5566). The adhesive force deviation was calculated by the following equation (1).

(Equation 1)

(Where X _i is the adhesive strength during the i th measurement in the measurement interval, m is the average value of the adhesion within the measurement interval, and n is the number of times the adhesive force is measured within the interval).

- Sample size: 25.4 mm (1 inch) wide, 250 mm long

- Peeling speed: 50 mm / min

- Measurement conditions: 25 ° C, 60% RH

- Obtained the measured average value of the stripping distance of 10 ~ 240mm

(2) Film thickness retention

After the film was laminated, the cross section of the sample was observed with a microscope to measure the thickness of the film, and then calculated using the following thickness retention rate equation.

Thickness retention ratio (%) = (film thickness after lamination) / (thickness before lamination) x 100

(3) Curl

After the film was laminated, the sample was placed on a flat table, and whether or not the side of the sample was lifted visually was visually checked. When there was an excited portion, the height of the highest portion was measured to measure the degree of bending.

(Example 1)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / (Film / metal plate for laminating a metal plate / metal plate) by inserting a film for a metal plate laminate having a thickness of 350 mu m and a thickness of 350 mu m between two metal plates to prepare a preliminary laminate. , And a 200 mm long steel plate was used as the substrate 1. The prepared preliminary laminate was placed on a lower substrate in a vacuum laminate chamber and then a rubber plate placed on the lower surface of the upper substrate, (Vacuum stage), the process temperature of the vacuum stage was 140 ° C., and the vacuum time was 5 minutes. When the vacuum state was changed to a vacuum state, the pressure at the upper portion of the chamber was -0.45 kPa The pressure in the lower part was -0.65 kPa. Then, in the vacuum atmosphere, the vacuum in the upper part of the chamber was released and only the vacuum in the lower part of the chamber was maintained so that the pressure was applied to the laminate (pressing step) The laminate after completion of the aging step was aged by standing in a hot air oven at 125 ° C for 24 hours (aging step). The properties of the laminate after the aging step were measured according to the evaluation items, and are shown in Table 1 below.

(Example 2)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / (Film / metal plate for laminating a metal plate / metal plate) by inserting a film for a metal plate laminate having a thickness of 350 mu m and a thickness of 350 mu m between two metal plates to prepare a preliminary laminate. , And a 200 mm long steel plate was used as the substrate 1. The prepared preliminary laminate was placed on a lower substrate in a vacuum laminate chamber and then a rubber plate placed on the lower surface of the upper substrate, (Vacuum stage), the process temperature of the vacuum stage was 140 ° C., and the vacuum time was 10 minutes. When the vacuum state was changed to a vacuum state, the pressure at the upper portion of the chamber was -0.45 kPa The pressure in the lower part of the burr was -0.65 kPa. Then, in the vacuum atmosphere, the vacuum in the upper part of the chamber was released and only the vacuum in the lower part of the chamber was maintained so that the pressure was applied to the laminate (pressing step). And the laminate completed the steps was aged by standing in a hot air oven at 125 ° C for 24 hours (aging step). The properties of the laminate after the aging step were measured according to the evaluation items, and are shown in Table 1 below.

(Example 3)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / (Film / metal plate for laminating a metal plate / metal plate) by inserting a film for a metal plate laminate having a thickness of 350 mu m and a thickness of 350 mu m between two metal plates to prepare a preliminary laminate. , And a 200 mm long steel plate was used as the substrate 1. The prepared preliminary laminate was placed on a lower substrate in a vacuum laminate chamber and then a rubber plate placed on the lower surface of the upper substrate, (Vacuum stage), the process temperature of the vacuum stage was 140 ° C., and the vacuum time was 59 minutes. When the vacuum state was changed to a vacuum state, the pressure at the upper portion of the chamber was -0.45 kPa The pressure in the lower part of the burr was -0.65 kPa. Then, in the vacuum atmosphere, the vacuum in the upper part of the chamber was released and only the vacuum in the lower part of the chamber was maintained so that the pressure was applied to the laminate (pressing step). And the laminate completed the steps was aged by standing in a hot air oven at 125 ° C for 24 hours (aging step). The properties of the laminate after the aging step were measured according to the evaluation items, and are shown in Table 1 below.

(Example 4)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / (Film / metal plate for laminating a metal plate / metal plate) by inserting a film for a metal plate laminate having a thickness of 350 mu m and a thickness of 350 mu m between two metal plates to prepare a preliminary laminate. , And a 200 mm long steel plate was used as the substrate 1. The prepared preliminary laminate was placed on a lower substrate in a vacuum laminate chamber and then a rubber plate placed on the lower surface of the upper substrate, (Vacuum stage), the process temperature of the vacuum stage was 150 ° C., and the vacuum time was 10 minutes. When the vacuum state was changed to a vacuum state, the pressure at the upper portion of the chamber was -0.45 kPa The pressure in the lower part of the burr was -0.65 kPa. Then, in the vacuum atmosphere, the vacuum in the upper part of the chamber was released and only the vacuum in the lower part of the chamber was maintained so that the pressure was applied to the laminate (pressing step). And the laminate completed the steps was aged by standing in a hot air oven at 125 ° C for 24 hours (aging step). The properties of the laminate after the aging step were measured according to the evaluation items, and are shown in Table 1 below.

(Example 5)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / (Film / metal plate for laminating a metal plate / metal plate) by inserting a film for a metal plate laminate having a thickness of 350 mu m and a thickness of 350 mu m between two metal plates to prepare a preliminary laminate. , And a 200 mm long steel plate was used as the substrate 1. The prepared preliminary laminate was placed on a lower substrate in a vacuum laminate chamber and then a rubber plate placed on the lower surface of the upper substrate, (Vacuum stage), the process temperature of the vacuum stage was 150 ° C., and the vacuum time was 10 minutes. When the vacuum state was changed to a vacuum state, the pressure at the upper portion of the chamber was -0.45 kPa The pressure in the lower part of the burr was -0.65 kPa. Then, in the vacuum atmosphere, the vacuum in the upper part of the chamber was released and only the vacuum in the lower part of the chamber was maintained so that the pressure was applied to the laminate (pressing step). And the laminated body after completion of the steps was measured for physical properties according to the evaluation items, and is shown in Table 1 below.

(Example 6)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / (Film / metal plate for laminating a metal plate / metal plate) by inserting a film for a metal plate laminate having a thickness of 350 mu m and a thickness of 350 mu m between two metal plates to prepare a preliminary laminate. , And a 200 mm long steel plate was used as the substrate 1. The prepared preliminary laminate was placed on a lower substrate in a vacuum laminate chamber and then a rubber plate placed on the lower surface of the upper substrate, (Vacuum stage), the process temperature of the vacuum stage was 160 ° C., and the vacuum time was 5 minutes. When the vacuum state was changed to a vacuum state, the pressure at the upper portion of the chamber was -0.45 kPa The pressure in the lower portion was -0.65 kPa. Then, in the vacuum atmosphere, the vacuum in the upper portion of the chamber was released and only the vacuum in the lower portion of the chamber was maintained so that the pressure was applied to the layered body (pressing step) , And the layered product obtained by completing the steps was measured for properties according to the evaluation items, and is shown in Table 1 below.

(Example 7)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / (Film / metal plate for laminating a metal plate / metal plate) by inserting a film for a metal plate laminate having a thickness of 350 mu m and a thickness of 350 mu m between two metal plates to prepare a preliminary laminate. , And a 200 mm long steel plate was used as the substrate 1. The prepared preliminary laminate was placed on a lower substrate in a vacuum laminate chamber and then a rubber plate placed on the lower surface of the upper substrate, (Vacuum stage), the process temperature of the vacuum stage was 170 ° C., and the vacuum time was 5 minutes. When the vacuum state was changed to a vacuum state, the pressure at the upper portion of the chamber was -0.45 kPa The pressure in the lower portion was -0.65 kPa. Then, in the vacuum atmosphere, the vacuum in the upper portion of the chamber was released and only the vacuum in the lower portion of the chamber was maintained so that the pressure was applied to the layered body (pressing step) , And the layered product obtained by completing the steps was measured for properties according to the evaluation items, and is shown in Table 1 below.

(Example 8)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / (Film / metal plate for laminating a metal plate / metal plate) by inserting a film for a metal plate laminate having a thickness of 350 mu m and a thickness of 350 mu m between two metal plates to prepare a preliminary laminate. , And a 200 mm long steel plate was used as the substrate 1. The prepared preliminary laminate was placed on a lower substrate in a vacuum laminate chamber and then a rubber plate placed on the lower surface of the upper substrate, (Vacuum stage), the process temperature of the vacuum stage was 180 ° C., and the vacuum time was 5 minutes. When the vacuum state was changed to a vacuum state, the pressure at the upper portion of the chamber was -0.45 kPa The pressure in the lower portion was -0.65 kPa. Then, in the vacuum atmosphere, the vacuum in the upper portion of the chamber was released and only the vacuum in the lower portion of the chamber was maintained so that the pressure was applied to the layered body (pressing step) , And the layered product obtained by completing the steps was measured for properties according to the evaluation items, and is shown in Table 1 below.

(Example 9)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / (Film / metal plate for laminating a metal plate / metal plate) by inserting a film for a metal plate laminate having a thickness of 350 mu m and a thickness of 350 mu m between two metal plates to prepare a preliminary laminate. , And a 200 mm long steel plate was used as the substrate 1. The prepared preliminary laminate was placed on a lower substrate in a vacuum laminate chamber and then a rubber plate placed on the lower surface of the upper substrate, (Vacuum stage), the process temperature of the vacuum stage was 180 ° C., and the vacuum time was 5 minutes. When the vacuum state was changed to a vacuum state, the pressure at the upper portion of the chamber was -0.45 kPa The pressure in the lower part was -0.65 kPa. Subsequently, in the vacuum atmosphere, the vacuum in the upper part of the chamber was released and only the vacuum in the lower part of the chamber was maintained so that the pressure was applied to the laminate (pressing step) , And the layered product obtained by completing the steps was measured for properties according to the evaluation items, and is shown in Table 1 below.

(Example 10)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / (Film / metal plate for laminating a metal plate / metal plate) by inserting a film for a metal plate laminate having a thickness of 350 mu m and a thickness of 350 mu m between two metal plates to prepare a preliminary laminate. , And a 200 mm long steel plate was used as the substrate 1. The prepared preliminary laminate was placed on a lower substrate in a vacuum laminate chamber and then a rubber plate placed on the lower surface of the upper substrate, (Vacuum stage), the process temperature of the vacuum stage was 180 ° C., and the vacuum time was 5 minutes. When the vacuum state was changed to a vacuum state, the pressure at the upper portion of the chamber was -0.45 kPa The pressure in the lower part was -0.65 kPa. Then, in the vacuum atmosphere, the vacuum in the upper part of the chamber was released and only the vacuum in the lower part of the chamber was maintained so that the pressure was applied to the laminate (pressing step) , And the layered product obtained by completing the steps was measured for properties according to the evaluation items, and is shown in Table 1 below.

(Comparative Example 1)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / A steel plate having a thickness of 250 탆, a width of 25.4 mm and a length of 200 mm was prepared as a metal plate laminate film having a thickness of 350 탆 and a thickness of 350 탆. Then, the laminate was taken out at a rate of 1.2 sec / cm, and then the laminate was heated to 125 ° C And the mixture was allowed to stand for 24 hours in a hot air oven (aging step). The laminate after completion of the steps was measured for properties according to the evaluation items and is shown in Table 1 below.

(Comparative Example 2)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / A steel plate having a thickness of 250 탆, a width of 25.4 mm and a length of 200 mm was prepared as a metal plate laminate film having a thickness of 350 탆 and a thickness of 350 탆. Then, the laminated body was taken out at a rate of 1.2 sec / cm. Then, the laminated body was heated at 125 DEG C And the mixture was allowed to stand for 24 hours in a hot air oven (aging step). The laminate after completion of the steps was measured for properties according to the evaluation items and is shown in Table 1 below.

(Comparative Example 3)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / A steel plate having a thickness of 250 탆, a width of 25.4 mm and a length of 200 mm was prepared as a metal plate laminate film having a thickness of 350 탆 and a thickness of 350 탆. Then, the laminate was taken out at a rate of 1.2 sec / cm. Then, the laminate was heated at 125 DEG C And the mixture was allowed to stand for 24 hours in a hot air oven (aging step). The laminate after completion of the steps was measured for properties according to the evaluation items and is shown in Table 1 below.

(Comparative Example 4)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / A steel plate having a thickness of 250 탆, a width of 25.4 mm and a length of 200 mm was prepared as a metal plate laminate film having a thickness of 350 탆 and a thickness of 350 탆. The laminated body was taken out at a rate of 1.2 sec / cm. Then, the laminated body was heated to 125 deg. C And the mixture was allowed to stand for 24 hours in a hot air oven (aging step). The laminate after completion of the steps was measured for properties according to the evaluation items and is shown in Table 1 below.

(Comparative Example 5)

90% by weight of a polyolefin resin (Lotte Chemicals SEETEC, LLDPE UL814 (MI: 20 g / 10 min (ASTM D1238), density: 0.924 g / A steel plate having a thickness of 250 탆, a width of 25.4 mm and a length of 200 mm was prepared as a metal plate laminate film having a thickness of 350 탆 and a thickness of 350 탆. Then, the laminate was taken out at a rate of 1.2 sec / cm, and then the laminate was heated at 125 ° C And the mixture was allowed to stand for 24 hours in a hot air oven (aging step). The laminate after completion of the steps was measured for properties according to the evaluation items and is shown in Table 1 below.

[Table 1]

As shown in Table 1, Examples 1 to 4 according to the present invention exhibited a uniform film lamination through vacuum, pressure, and aging steps, and showed a uniform adhesive force of at least 0.51 kgf / inch ) Can be implemented. Further, the film thickness retention property was excellent, and no curl phenomenon occurred. In addition, Examples 5 to 10 according to the present invention did not perform the aging step, but it was confirmed that high initial adhesion was achieved by controlling the vacuum process temperature and press time, and that the film had excellent film thickness retention characteristics. On the other hand, the comparative examples were able to achieve a high adhesive strength after aging by performing a roll lamination process unlike the film lamination method according to the present invention. However, the deviation of the adhesive force was 6.6 times larger than the embodiment of the present invention, The holding property and the bending property were remarkably decreased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Various modifications and variations are possible in light of the above teachings.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

11: upper substrate 12: upper substrate support
21: Rubber plate 31: Laminate
32: first metal plate 33: resin film
34: second metal plate 41: lower substrate
42: Lower substrate support

Claims (15)

A preparation step of placing a laminate in which a polyolefin resin film is interposed between two metal plates, on a lower substrate in a vacuum chamber having an upper substrate, a rubber plate and a lower substrate,
A vacuum step of converting the inside of the chamber into a vacuum state so that the rubber plate located at the lower part surrounds the laminate while the upper substrate moves downward;
A pressing step of releasing the vacuum state of the upper part of the chamber with respect to the rubber plate and applying pressure to the laminated body
≪ / RTI >
The method according to claim 1,
And the vacuum step is carried out at 80 to 200 DEG C for 5 to 60 minutes.
The method according to claim 1,
Wherein the vacuum step is such that the upper substrate is lowered and the rubber plate located at the lower portion of the upper substrate contacts the laminate and then the rubber plate surrounds the laminate by vacuum.
The method according to claim 1,
And the pressing step is carried out at 80 to 200 DEG C for 5 to 120 minutes.
The method according to claim 1,
Further comprising aging the film laminate after completion of the pressing step at a temperature of 100 to 140 占 폚 for 12 to 48 hours.
The method according to claim 1,
Wherein the polyolefin resin film comprises 30 to 95% by weight of a polyolefin resin and 5 to 70% by weight of a polyamide resin.
The method according to claim 6,
Wherein the polyolefin resin has a melt index (190 DEG C, 2160 g) of 0.3 to 60 g / 10 min and a density of 0.80 to 0.95 g / cm < 3 >.
The method according to claim 6,
The polyamide resin may be a copolymer of nylon 6, nylon 66, nylon 46, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon 6/66/610 copolymer, nylon MXD6, nylon 6T, nylon 6 / 6T copolymers, nylon 66 / PP copolymers, nylon 66 / PPS copolymers, methoxymethylates of 6-nylon, methoxymethylates of 6-610-nylons and methoxymethylates of 612-nylons Or a mixture of two or more thereof.
The method according to claim 1,
Wherein the metal plate is at least one selected from the group consisting of stainless steel, aluminum, copper, zinc plating, metal plate, cold-rolled metal plate, colored metal plate, pickled metal plate and corrosion-resistant coated metal plate.
A laminate obtained by laminating a metal plate on both sides of a polyolefin resin film, wherein the adhesive strength between the film and the metal plate is 15 kgf / inch or more and satisfies the adhesive force variation range of the following formula (1).
(Equation 1)

(In the formula 1, X _i is the adhesive strength at the i-th measurement in the measurement interval of 10 to 240 mm, m is the average value of the adhesive force within the measurement interval, and n is the number of times of the adhesion force measurement at the interval. , And 60% RH) at a rate of 50 mm / min.
11. The method of claim 10,
Wherein the polyolefin resin film comprises 30 to 95% by weight of a polyolefin resin and 5 to 70% by weight of a polyamide resin.
11. The method of claim 10,
The polyolefin resin has a melt index (190 DEG C, 2160 g) of 0.3 to 60 g / 10 min and a density of 0.80 to 0.95 g / cm < 3 >.
11. The method of claim 10,
The polyamide resin may be a copolymer of nylon 6, nylon 66, nylon 46, nylon 11, nylon 12, nylon 610, nylon 612, nylon 6/66, nylon 6/66/610 copolymer, nylon MXD6, nylon 6T, nylon 6 / 6T copolymers, nylon 66 / PP copolymers, nylon 66 / PPS copolymers, methoxymethylates of 6-nylon, methoxymethylates of 6-610-nylons and methoxymethylates of 612-nylons A film laminate which is either one or a mixture of two or more.
11. The method of claim 10,
Wherein the metal plate is at least one selected from the group consisting of stainless steel, aluminum, copper, zinc plating, metal plate, cold-rolled metal plate, colored metal plate, pickled metal plate and corrosion-resistant coated metal plate.
11. The method of claim 10,
The film laminate has a film thickness retention of 92% or more before and after the laminating process.

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