KR20240050506A - Manufacturing method of multilayer adhesive film having polarity for composite panel and steel sheet - Google Patents

Abstract

The present invention relates to a method of manufacturing a polar multilayer adhesive film for attaching composite panels and steel plates. It secures the functional properties of each layer of the inner, middle, and outer layers of the film, improves adhesion to heterogeneous adhesives on both sides, and improves the manufacturing process. The purpose is to improve productivity and reduce manufacturing costs by simplifying.
The multilayer adhesive film according to the present invention is composed of a first film forming an inner layer, a second film forming a middle layer, and a third film forming an outer layer, and the first film is made of low-density polyethylene (LDPE) 30. To a composition of 60 to 60% by weight and 20 to 50% by weight of polyolefin elastomer (POE), a functional rubber capable of creating a reactor is added to react with the metal adherend attached to one side of the inner layer, and the second film is , It consists of a composition mixed with 40 to 60% by weight of low-density polyethylene (LDPE) and 40 to 60% by weight of linear low-density polyethylene (LLDPE), and the third film includes 20 to 50% by weight of low-density polyethylene (LDPE) and polyolefin elastomer. (POE) A functional rubber capable of creating a reactor is added to the mixed composition at 20 to 50% by weight, so that it reacts with the metal adherend or polyethylene terephthalate (PET) adherend attached to one side of the outer layer, The multilayer adhesive film is characterized in that it is manufactured by a bottom-up coextrusion method.

Description

Manufacturing method of polar multilayer adhesive film for attaching composite panels and steel sheets {MANUFACTURING METHOD OF MULTILAYER ADHESIVE FILM HAVING POLARITY FOR COMPOSITE PANEL AND STEEL SHEET}

The present invention relates to a method of manufacturing a polar multilayer adhesive film attached to composite panels and steel plates used in various home appliances, building materials, automobiles, etc., and more specifically, to a method of manufacturing a multi-functional thermoplastic film using a single manufacturing process using a bottom-up co-extrusion method. It relates to a method of manufacturing a polar multilayer adhesive film for attaching composite panels and steel plates that can produce a polymer multilayer adhesive film.

In general, multilayer adhesive film refers to an adhesive film made up of several layers.

These multilayer adhesive films are bonded to composite panels and steel plates used in various home appliances, building materials, automobiles, etc.

A metal adhesive is usually attached to the inner layer of the multilayer adhesive film (hereinafter simply referred to as 'adhesive film' or 'film'), and an organic adhesive such as PET foam or non-woven fabric is attached to the outer layer.

In the case of the metal adherend, adhesion is possible using polyolefin (PO) among the polymer polymer raw materials, and various adhesion strengths can be achieved depending on the composition.

In addition, when using the above organic materials, the product can be made lighter and can be applied to various fields such as home appliances, building materials, and automobiles.

When manufacturing the multilayer adhesive film, there is a method of melting two or more raw materials in different extruders and then stacking the molten resin in several layers to form a film. This is called the 'Co-Extrusion method'. And the film manufactured in this way is usually called a ‘co-extruded film’.

The co-extrusion method can be divided into a blown method and a casting method depending on the cooling method of the film.

In the blown method, the stacked molten raw materials come out in the form of a tube through a die, and are divided into bottom-up and top-down depending on the cooling method.

The upward blown method uses raw materials with low flowability, the die discharge port is directed upward, and when the film comes out through the die discharge port, it is cooled with cold air.

The film produced by the bottom-up blown method has somewhat lower transparency and elongation, but has the advantage of being cheaper than the water-cooled method due to its high productivity.

The top-down blown method uses raw materials with high flowability, the die discharge port is directed downward, and when the film comes out through the die discharge port, it is cooled with a cooling roll or cold water.

The film manufactured by the top-down blown method is expensive because the co-extruded film has low productivity, but is widely used in molded films because of its good transparency and elongation.

In addition, the multilayer adhesive film is manufactured using a co-extrusion method using polyolefin as a raw material, and a molding extrusion method using non-polar raw materials such as thermoplastic polyurethane (TPU: Thermoplastic Polyurethane) and polyamide (PA: Polyamide). It can be divided into a method of manufacturing a multilayer film, a method of manufacturing a single layer film of each raw material individually using a coextrusion method, and then manufacturing a multilayer film through a separate laminating process.

Figures 1 to 3 show multilayer adhesive films manufactured by a conventional method, Figure 1 is a single-layer film manufactured by a co-extrusion method, Figure 2 is a non-polar multi-layer film manufactured by a co-extrusion method, and Figure 3 is a molding film. This shows a polar multilayer film manufactured by the extrusion method.

On the other hand, if the surface of the metal adherend to which the adhesive film is to be bonded is not rough, the melting point of the film and the extrusion temperature of the manufacturing process must be appropriately designed so that the adhesive film can sufficiently melt and adhere.

In general, non-polar polyethylene (PE) is widely used as a raw material for films, and when the adherend is polar polyethylene terephthalate (PET), there is a problem in that it is difficult to secure adhesion due to lack of reactivity.

To solve this problem, there is a method of improving adhesion to polar PET by using a polar urethane component.

However, in this case, because the flowability of urethane is low, production is impossible using the above-mentioned bottom-up co-extrusion method, and the molding extrusion method must be applied.

As a result, production speed decreases and there is a problem of having to go through multiple processes.

In addition, urethane has good reactivity with polar PET, but has the disadvantage of poor adhesion to the metal of the inner layer.

Additionally, if the PE layer must be implemented in the form of a multilayer film, reactivity is lowered because PE is non-polar and urethane is polar. Accordingly, there is a problem in that a separate nylon layer must be formed to attach them.

Meanwhile, conventional films are manufactured as a single-layer film using a coextrusion method, a multilayer film made of non-polar raw materials that do not react with polarity, or a multilayer film using a molding extrusion method.

However, in the case of a single-layer film, there is a disadvantage that it is difficult to secure two-way adhesion to a heterogeneous adherend.

In addition, when constructing a multilayer film with polyolefin, a polar raw material, there is a problem of poor adhesion to non-polar adherends such as PE.

Meanwhile, in order to ensure adhesion to non-polar materials, a multilayer film can be manufactured using non-polar raw materials such as TPU or PA.

However, in this case, manufacturing is impossible with a single bottom-up co-extrusion process, and a separate lining process and extrusion molding method must be applied.

There is a problem in that the production speed of the film is reduced due to this.

Korean Patent No. 10-1562257 (announced on October 22, 2015) Korean Patent No. 10-1488142 (announced on January 29, 2015)

The present invention is intended to solve the problems of the prior art described above, and is a multilayer adhesive film that can improve adhesion to heterogeneous adhesives on both sides by securing the functional properties of each layer of the inner, middle, and outer layers of the multilayer adhesive film. The purpose is to provide a manufacturing method.

Another object of the present invention is to improve adhesion by maximizing reactivity with each adherend when the two sides of the adherend are different.

Another purpose of the present invention is to improve productivity and reduce manufacturing costs by simplifying the manufacturing process of the multilayer adhesive film.

Another object of the present invention is to provide a method for manufacturing a multilayer adhesive film in a single process that can simultaneously satisfy elongation and adhesive strength.

In order to achieve the above object, the multilayer adhesive film according to the present invention is composed of a first film forming an inner layer, a second film forming a middle layer, and a third film forming an outer layer, and the first film is , A functional rubber capable of creating a reactor is added to a composition containing 30 to 60% by weight of low-density polyethylene (LDPE) and 20 to 50% by weight of polyolefin elastomer (POE), and reacts with the metal adherend attached to one side of the inner layer. The second film is composed of a mixture of 40 to 60% by weight of low-density polyethylene (LDPE) and 40 to 60% by weight of linear low-density polyethylene (LLDPE), and the third film is made of low-density polyethylene (LDPE). A functional rubber capable of creating a reactor is added to a composition containing 20 to 50% by weight of polyolefin elastomer (POE), thereby forming a metal adherend or polyethylene terephthalate (PET) attached to one side of the outer layer. ) to react with the adherend, and the multilayer adhesive film is characterized in that it is manufactured by a bottom-up coextrusion method.

Additionally, the first film is characterized in that it includes low-density polyethylene (LDPE) with a melt index (MI) of 0.5 to 10 g/10 min.

In addition, the functional rubber added to the first film is characterized by containing 5 to 20% by weight of styrene butadiene rubber (SBR).

In addition, the second film is composed of low-density polyethylene (LDPE) with a melt index (MI) of 0.5 to 10 g/10 min, and linear low-density polyethylene (LLDPE) with a melt index (MI) of 0.5 to 5 g/10 min. It is characterized in that it is bonded between the first film and the third film to maintain the rigidity of the multilayer film.

In addition, the third film is characterized by comprising low-density polyethylene (LDPE) with a melt index (MI) of 1 to 20 g/10 min.

In addition, the functional rubber added to the third film includes 5 to 20% by weight of styrene-butadiene rubber (SBR), 5 to 20% by weight of styrene-ethylene-butadiene-styrene (SEBS), and 5 to 20% by weight of low molecular weight petroleum rubber. It is characterized by containing.

In addition, maleic anhydride (MAH) and tetrakis(methylene(3,5-di-tertbutyl-4-hydroxyhydrocinnamic acid))methane additives are added to the third film composition.

In addition, the third film composition is characterized in that a phenol-based antioxidant and a blocking agent are added.

Additionally, 3 to 8 wt% of dye silicone masterbatch is added to 100 wt% of the low-density polyethylene (LDPE) composition.

In addition, the multilayer adhesive film is characterized by a melt index (MI) of 1 to 10 g/10 min and a film thickness of 25 to 200 um.

Additionally, the thickness of the first film forming the inner layer is 10 to 50 um, the thickness of the second film forming the middle layer is 5 to 100 um, and the thickness of the third film forming the outer layer is 10 to 50 um.

According to the present invention, there is an effect of improving adhesion to heterogeneous adhesives on both sides by securing the functional properties of each layer of the inner, middle, and outer layers of the multilayer adhesive film.

In addition, when the two sides of the adherend are different, there is an effect of improving adhesion by maximizing the reactivity with each adherend.

In particular, there is an effect of improving adhesion by mixing functional additives with raw materials of non-polar PE and polar PET, which have different compatibility, to create a cross-linking reactor.

Additionally, by mixing a functional rubber that can generate a reactive -OH group, there is an effect of securing the crosslinking properties of the opposing raw materials.

Additionally, by simplifying the manufacturing process of the multilayer adhesive film, productivity can be improved and manufacturing costs can be reduced.

In addition, it has the effect of satisfying the elongation and adhesive strength of the multilayer adhesive film at the same time.

Figure 1 is a cross-sectional view showing a single-layer film manufactured by a co-extrusion method according to the prior art.
Figure 2 is a cross-sectional view showing a non-polar multilayer film manufactured by a co-extrusion method according to the prior art.
Figure 3 is a cross-sectional view showing a polar multilayer film manufactured by a molding and extrusion method according to the prior art.
Figure 4 is a cross-sectional view showing a polar multilayer film manufactured by the coextrusion method according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

As shown in FIG. 4, the polar multilayer adhesive film according to the present invention is composed of a first film forming an inner layer, a second film forming a middle layer, and a third film forming an outer layer.

Here, the first film is a composition of 30 to 60% by weight of low density polyethylene (LDPE) and 20 to 50% by weight of polyolefin elastomer (POE), and styrene-butadiene rubber (SBR). Rubber) is composed by adding 5 to 20% by weight.

And the second film is composed of a composition in which 40 to 60% by weight of low density polyethylene (LDPE) and 40 to 60% by weight of linear low density polyethylene (LLDPE) are mixed.

In addition, the third film is a composition of 20 to 50% by weight of low-density polyethylene (LDPE) and 20 to 50% by weight of polyolefin elastomer (POE), 5 to 20% by weight of styrene butadiene rubber (SBR), and styrene-ethylene- It is composed of adding 5 to 20% by weight of butadiene-styrene (SEBS: Styrene-Ethylene-Butadien-Styrene) and 5 to 20% by weight of low molecular weight petroleum rubber.

Additionally, the multilayer adhesive film according to the present invention is manufactured by a bottom-up coextrusion method.

The first film contains low-density polyethylene (LDPE) with a melt index (MI) of 0.5 to 10 g/10 min, and a functional rubber capable of creating a reactor is added to react with the metal adherend.

The functional rubber serves to form a reactive group in order to have bonding power with polar materials.

In addition, the second film includes low-density polyethylene (LDPE) with a melt index (MI) of 0.5 to 10 g/10 min, and linear low-density polyethylene (LLDPE) with a melt index (MI) of 0.5 to 5 g/10 min, and the first film and the third film to maintain the rigidity of the multilayer film.

And the third film contains low-density polyethylene (LDPE) with a melt index (MI) of 1 to 20 g/10 min, and a functional rubber capable of creating a reactor is added to form a metal adherend or polyethylene terephthalate (PET: Polyethylene). Terephtalate) to react with the adherend.

In addition, it is preferable that maleic anhydride (MAH) and tetrakis (methylene (3,5-di-tertibutyl-4-hydroxyhydrocinnamic acid)) methane additives are further added to the third film composition. .

And it is preferable that a phenol-based antioxidant and a blocking agent are further added to the third film composition.

The antioxidants include octadecyl 3,5-di-tertbutyl-4-hydroxyhydrocinnamic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxybenzenepropanoic acid, and octadecyl. Ester, 1,3,5-trimethyl-2,4,6-tri(3,5-di-T-butyl-4-hydroxybenzyl)benzene, 1,3,5-triazine-2,4,6 (1H,3H,5H)-trione, 1,3,5-tris[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl], methyldi-t-butylhydride Roxyhydrocinnamate, etc. may be used.

Additionally, as an antiphosphorus agent, tris(2,4-di-t-butylphenyl)phosphite, bis(2,4-di-butylphenyl), etc. may be used.

Additionally, 3 to 8 wt% of dye silicone masterbatch is added to 100 wt% of the low-density polyethylene (LDPE) composition.

Dye masterbatch is used when adding color to a film, and it is preferable to use polydimethylsiloxane, a silicone compound.

The silicone masterbatch is a PDMS (polydimethylsiloxane)-based resin made by dispersing various plastic resins into ultra-high molecules, and serves to improve the scratch prevention function.

Additionally, the silicone masterbatch serves to prevent fluid and organic plastic additives from escaping, which may occur when using silicone materials.

In addition, the multilayer adhesive film according to the present invention preferably has a melt index (MI) of 1 to 10 g/10 min and a film thickness of 25 to 200 um.

Here, the thickness of the first film forming the inner layer is preferably 10 to 50 μm, the thickness of the second film forming the middle layer is 5 to 100 μm, and the thickness of the third film forming the outer layer is preferably 10 to 50 μm.

The process for manufacturing the multilayer adhesive film according to the present invention will now be described.

First, polyolefin (PO) raw materials are used to prepare raw materials to enable adhesion to heterogeneous adherends on the inner and outer layers.

Next, LDPE+POE is used as a base to react with the metal adherend of the inner layer, and styrene butadiene rubber (SBR) is added as a functional rubber additive.

In addition, LDPE+POE is used as a base to react with the PET (non-woven fabric) adherend of the outer layer, and styrene-butadiene rubber (SBR), styrene-ethylene-butadiene-styrene (SEBS), and low-molecular-weight petroleum-based rubber are added as functional rubber additives.

And the middle layer uses LLDPE+LDPE as a base to achieve film rigidity regardless of the adherend.

Next, the above three types of raw materials are mixed in individual tanks, and then a multilayer adhesive film is manufactured using a bottom-up coextrusion method.

In general, polar substances react and bond only with polar elements, and non-polar substances react only with non-polar substances.

Therefore, non-polar PE and polar PET are not reactive, but according to the present invention, a cross-linking reactive group can be created by mixing functional additives with PE.

This can improve two-way adhesion to heterogeneous adhesives attached to both sides of the film.

That is, by securing the functional properties of each layer of the inner, middle, and outer layers of the film, adhesion to heterogeneous adhesives on both sides can be improved.

In particular, adhesion strength can be improved by mixing functional additives with raw materials of non-polar PE and polar PET to create a cross-linking reactor.

Additionally, by simplifying the manufacturing process of the multilayer adhesive film, productivity can be improved, manufacturing costs can be reduced, and elongation and adhesive strength can be satisfied at the same time.

Hereinafter, test results of examples and comparative examples of the multilayer adhesive film manufactured according to the present invention will be described. First, the results of the adhesion test of the third film forming the outer layer will be described.

<Example 1>

After preparing the third film composition by adjusting the melt index of low-density polyethylene (LDPE, manufacturer Jooeun Chemical FM-350) to 3g/10min, the extrusion amount is 50%, line speed is 15m/min, and air amount is 1,500rpm using a multilayer film molding machine. , a film with a thickness of 30 μm was manufactured under the conditions of a cylinder temperature of 200°C and a die temperature of 150°C.

<Example 2>

A third film composition was prepared by adjusting low-density polyethylene (LDPE, manufactured by Lotte Chemical LF-312) to a melt index of 0.8 g/10 min, and then the film was manufactured under the same conditions as in Example 1 above.

<Example 3>

A third film composition was prepared by adjusting low-density polyethylene (LDPE, manufactured by Lotte Chemical LF-510) to a melt index of 3 g/10 min, and then the film was manufactured under the same conditions as in Example 1 above.

<Example 4>

A third film composition was prepared by adjusting low-density polyethylene (LDPE, manufactured by Lotte Chemical XL-700) to a melt index of 0.8 g/10 min, and then the film was manufactured under the same conditions as in Example 1 above.

<Example 5>

A third film composition was prepared by adjusting linear low density polyethylene (LLDPE, manufactured by LG Chemical HP-1018) to a melt index of 0.9 g/10 min, and then the film was prepared under the same conditions as in Example 1 above.

<Comparative Example 1>

A third film composition was prepared by adjusting ethylene vinyl acetate (EVA, manufactured by Shinkwang Hot Melt SH-300F) to a melt index of 2.5 g/10 min, and then the film was manufactured under the same conditions as in Example 1 above.

<Comparative Example 2>

A third film composition was prepared by adjusting low-density polyethylene (LDPE, manufactured by Chemetech Korea PE-125) to a melt index of 20 g/10 min, and then the film was manufactured under the same conditions as in Example 1 above.

The films prepared in Examples 1 to 5 and Comparative Examples 1 to 2 were made into composite panel specimens with a width of 25 mm and a length of 300 mm, respectively, and then subjected to T-shaped forced peeling, and the peeling force at a speed of 50 mm/min was measured at the N unit peak ( Peak) was measured as a standard. [Table 1] below shows the test results.

Peel strength test results of examples and comparative examples of the present invention item Embodiments of the present invention Comparative example One 2 3 4 5 One 2 MI (g/min) 3 0.8 3 0.8 0.9 2.5 20 Peel strength (N) 112 62 43 38 58 71 14 Judgment Good Good error error error Good error

It is desirable that the third film and the PET adherend have a peel strength of 60N or more, and the peel strength of the Example 1 film was 112, showing the best adhesion.

Next, the tensile strength test results for each layer of the film are explained.

<Example 6>

Set the conditions of 1st film (inner layer) screw RPM 19.7 (thickness 20um), 2nd film (middle layer) screw RPM 28.5 (thickness 20um), and 3rd film (outer layer) screw RPM 40.0 (thickness 30um). Low-density polyethylene (LDPE, FM-310) is adjusted to a melt index of 3g/10min, the second film is low-density polyethylene (LDPE, LF-312) adjusted to a melt index of 0.8g/10min, and the third film is low-density polyethylene. (LDPE, FM-350) was adjusted to a melt index of 4.5 g/10 min.

And using a film molding machine, a multilayer film was manufactured at an extrusion rate of 135 kg/hr under the conditions of a line speed of 15 m/min, an air volume of 1,200 rpm, a cylinder temperature of 200°C, and a die temperature of 180°C.

<Example 7>

The conditions were set to 1st film screw RPM 17.3 (thickness 17.5um), 2nd film screw RPM 32.2 (thickness 22.5um), and 3rd film screw RPM 40.0 (thickness 30um), and other than that, the same conditions as Example 6 above. A multilayer film was manufactured.

<Example 8>

The conditions were set to 1st film screw RPM 17.3 (thickness 17.5um), 2nd film screw RPM 25.0 (thickness 17.5um), and 3rd film screw RPM 45.5 (thickness 35um), and other than that, the same conditions as Example 6 above. A multilayer film was manufactured.

<Example 9>

The conditions were set to the first film screw RPM of 19.7 (thickness 20um), the second film screw RPM of 21.4 (thickness of 15um), and the third film screw RPM of 45.5 (thickness of 35um), and other than that, the multilayer process was performed under the same conditions as Example 6 above. A film was prepared.

<Example 10>

The conditions were set to 1st film screw RPM 19.7 (thickness 20um), 2nd film screw RPM 32.1 (thickness 22.5um), and 3rd film screw RPM 35.7 (thickness 27.5um), and other than that, the same conditions as Example 6 above. A multilayer film was manufactured.

<Comparative Example 3>

The conditions were set to the first film screw RPM of 22.5 (thickness 25um) and the third film screw RPM of 65 (thickness of 45um), and other than that, a multilayer film was manufactured under the same conditions as in Example 6 above. [Table 2] below shows the test results.

Tensile strength and peel strength test results of examples and comparative examples of the present invention item Embodiments of the present invention Comparative example 6 7 8 9 10 3
screw
RPM 1st film 19.7 17.3 17.3 19.7 19.7 22.5 2nd film 28.5 32.2 25 21.4 32.1 0 3rd film 40 40 45.5 45.5 35.7 65
Thickness (㎛) 1st film 20 17.5 17.5 20 20 25 2nd film 20 22.5 17.5 15 22.5 0 3rd film 30 30 35 35 27.5 45 Tensile strength (N/25mm) 441 420 379 402 469 294 Peel strength (N/25mm) 91 75 94 96 42 108 Judgment Good Good Good Good error error

As can be seen in [Table 2] above, Examples 6 to 9 showed good tensile strength and peel strength.

According to the method for manufacturing a multilayer adhesive film according to the present invention, the adhesion to heterogeneous adhesives on both sides can be improved by securing the functional properties of each layer of the inner, middle, and outer layers of the film.

In particular, when the two sides of the adherend are different, adhesion can be improved by maximizing the reactivity on each side.

The above is an exemplary description of preferred embodiments of the present invention, and the scope of the present invention is not limited to the specific embodiments described above. Anyone skilled in the art to which the present invention pertains will understand that various modifications and changes can be made without departing from the scope of the technical idea of the present invention.

Claims (11)

A method for manufacturing a polar multilayer adhesive film attached to composite panels and steel plates,
The multilayer adhesive film is composed of a first film forming an inner layer, a second film forming a middle layer, and a third film forming an outer layer,
The first film is,
A functional rubber capable of creating a reactor is added to a composition containing 30 to 60% by weight of low-density polyethylene (LDPE) and 20 to 50% by weight of polyolefin elastomer (POE) to react with the metal adherend attached to one side of the inner layer. ,
The second film is composed of a mixture of 40 to 60% by weight of low-density polyethylene (LDPE) and 40 to 60% by weight of linear low-density polyethylene (LLDPE),
The third film is a composition of 20 to 50% by weight of low-density polyethylene (LDPE) and 20 to 50% by weight of polyolefin elastomer (POE), and a functional rubber capable of creating a reactor is added to one side of the outer layer. Let it react with the attached metal adherend or polyethylene terephthalate (PET) adherend,
A method of manufacturing a polar multilayer adhesive film for attaching composite panels and steel plates, characterized in that the multilayer adhesive film is manufactured by a bottom-up coextrusion method. According to claim 1,
The first film is,
A method of manufacturing a polar multilayer adhesive film for attaching composite panels and steel plates, comprising comprising low-density polyethylene (LDPE) with a melt index (MI) of 0.5 to 10 g/10 min. According to claim 1,
A method of manufacturing a polar multilayer adhesive film for attaching composite panels and steel plates, characterized in that the functional rubber added to the first film is 5 to 20% by weight of styrene butadiene rubber (SBR). According to claim 1,
The second film is,
It is composed of low-density polyethylene (LDPE) with a melt index (MI) of 0.5 to 10 g/10 min, and linear low-density polyethylene (LLDPE) with a melt index (MI) of 0.5 to 5 g/10 min,
A method of manufacturing a polar multilayer adhesive film for attaching a composite panel and a steel plate, characterized in that it is bonded between the first film and the third film to maintain the rigidity of the multilayer film. According to claim 1,
The third film is,
A method of manufacturing a polar multilayer adhesive film for attaching composite panels and steel plates, comprising comprising low-density polyethylene (LDPE) with a melt index (MI) of 1 to 20 g/10 min. According to claim 1,
The functional rubber added to the third film contains 5 to 20% by weight of styrene-butadiene rubber (SBR), 5 to 20% by weight of styrene-ethylene-butadiene-styrene (SEBS), and 5 to 20% by weight of low molecular weight petroleum rubber. A method of manufacturing a polar multilayer adhesive film for attaching composite panels and steel plates, characterized in that. According to claim 5,
Composite panels and steel sheets, characterized in that maleic anhydride (MAH) and tetrakis (methylene (3,5-di-tertbutyl-4-hydroxyhydrocinnamic acid)) methane additives are added to the third film composition. Method for manufacturing polar multilayer adhesive film for attachment. According to claim 5,
A method of manufacturing a polar multilayer adhesive film for attaching composite panels and steel plates, characterized in that a phenol-based antioxidant and a blocking agent are further added to the third film composition. According to claim 1,
A method for producing a polar multilayer adhesive film for attaching composite panels and steel plates, characterized in that 3 to 8 wt% of dye silicone masterbatch is added to 100 wt% of the low-density polyethylene (LDPE) composition. According to claim 1,
A method of manufacturing a polar multilayer adhesive film for attaching composite panels and steel plates, characterized in that the multilayer adhesive film has a melt index (MI) of 1 to 10 g/10 min and a film thickness of 25 to 200 um. According to claim 10,
Composite panels and steel sheets wherein the first film forming the inner layer has a thickness of 10 to 50 um, the second film forming the middle layer has a thickness of 5 to 100 um, and the third film forming the outer layer has a thickness of 10 to 50 um. Method for manufacturing polar multilayer adhesive film for attachment.

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