KR102128461B1 - Functional film, and laminated steel sheet and method for manufacturing the same - Google Patents

Abstract

A functional film having excellent adhesion to a steel sheet base material is disclosed.
Disclosed is a laminate steel plate applicable to an exterior material of a household appliance such as a refrigerator, a washing machine, an air conditioner, and an exterior material of a furniture, and a manufacturing method thereof.
The laminated steel sheet according to the present invention includes a steel sheet base material; Functional film located on top of the steel base material; And a hot melt adhesive layer applied between the steel sheet base material and the functional film to bond the steel sheet base material and a functional film; wherein the functional film includes a vinyl chloride resin, an acrylic resin and a pigment, and an upper portion of the hot melt adhesive layer. Functional resin layer located on; A primer layer positioned on the functional resin layer; And a PET layer positioned on the primer layer. And a surface treatment layer formed on the PET layer and formed from a polyurethane-based surface treatment agent, wherein one surface of the PET layer contacting the primer layer is corona-treated.

Description

Functional film and laminate steel sheet using same and manufacturing method therefor{FUNCTIONAL FILM, AND LAMINATED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME}

The present invention relates to a laminated steel sheet using a functional film and a method for manufacturing the same.

Laminate steel sheets with films attached to one or both sides of steel sheets are mainly used for food containers, oil tubes, and electronic parts. The laminated steel sheet is manufactured by heating the steel sheet at a constant temperature, and then bonding the film to one or both surfaces of the steel sheet. In this bonding method, chlorophenol is applied as a primer to the film surface in order to improve the adhesion between the steel sheet and the film. Chlorophenol increases adhesion, but is limited in the working environment because environmental regulations are followed. In addition, chlorophenol has a disadvantage of high cost.

On the other hand, in order to solve this problem, research into manufacturing a laminate steel sheet using an adhesive containing various functional additives is being conducted.

However, due to humidity or temperature, the adhesive strength is not continuously maintained, and after a certain period of time, a phenomenon occurs between the steel sheet and the film.

Therefore, it is necessary to develop a primer to replace the existing chlorophenol and to improve the manufacturing method of the laminate steel sheet.

Background art related to the present invention includes the Republic of Korea Patent Application Publication No. 2000-0038815 (published on July 5, 2000), the document describes the embossed fusion lamina steel sheet and a method of manufacturing the same.

An object of the present invention is to provide a functional film comprising a PET layer and a primer layer having excellent adhesion.

Another object of the present invention is to provide a laminate steel plate for exterior of a home appliance and a method for manufacturing the same.

In the present invention, in the functional film to be adhered to the base material of the steel sheet, comprising a vinyl chloride resin, an acrylic resin and a pigment, a functional resin layer located on top of the steel base material; Located on top of the functional resin layer, a primer layer comprising a polymer resin and a crosslinking agent; And a PET layer positioned on the primer layer. And it is located on top of the PET layer, a surface treatment layer formed from a polyurethane-based surface treatment agent; includes, one side of the PET layer in contact with the primer layer is provided with a functional film characterized in that the corona treatment.

In addition, in the present invention (a) using a corona discharge, the surface treatment of one surface of the PET layer; (b) forming a surface treatment layer by applying a polyurethane-based surface treatment agent on the other surface of the PET layer; (c) forming a primer layer by applying a primer composition comprising a polymer resin and a crosslinking agent to one surface of the PET layer surface-treated by the corona discharge; And (d) forming a functional resin layer by applying a functional resin composition comprising a vinyl chloride resin, an acrylic resin, and a pigment on the primer layer; a method for manufacturing a functional film is provided. .

In addition, in the present invention, the steel plate base material; Functional film located on top of the steel base material; And a hot melt adhesive layer applied between the steel sheet base material and the functional film to bond the steel sheet base material and a functional film; wherein the functional film includes a vinyl chloride resin, an acrylic resin and a pigment, and an upper portion of the hot melt adhesive layer. Functional resin layer located on; Located on top of the functional resin layer, a primer layer comprising a polymer resin and a crosslinking agent; And a PET layer positioned on the primer layer. And it is located on top of the PET layer, a surface treatment layer formed from a polyurethane-based surface treatment agent; includes, one surface of the PET layer in contact with the primer layer is provided with a laminated steel sheet characterized in that the corona treatment.

In addition, in the present invention (a) preparing a steel sheet base material; And (b) applying a hot melt adhesive on the steel sheet base material to adhere the functional film, but adhering the functional resin layer included in the functional film adjacent to the steel sheet base material; and the method of manufacturing the functional film (b1) surface-treating one surface of the PET layer using corona discharge; (b2) forming a surface treatment layer by applying a polyurethane-based surface treatment agent on the other surface of the PET layer; (b3) forming a primer layer by applying a primer composition including a polymer resin and a crosslinking agent to one surface of the PET layer surface-treated by the corona discharge; And (b4) forming a functional resin layer by applying a functional resin composition containing a vinyl chloride-based resin, an acrylic resin, and a pigment on the primer layer; a method of manufacturing a laminated steel sheet is provided. .

The functional film according to the present invention includes a primer layer formed of a polymer resin and a crosslinking agent, and thus has excellent adhesion between the PET layer and the functional resin layer.

The laminated steel sheet according to the present invention is manufactured by applying a hot melt adhesive on a steel sheet base material and then bonding a functional film. The laminate steel sheet is excellent in adhesion between the steel sheet base material and the functional film, adhesion between the primer layer and the functional resin layer, and heat resistance of the laminate steel sheet.

In addition, since the laminate steel sheet according to the present invention has a beautiful appearance characteristic compared to a general painted steel sheet, it can be applied as an exterior material of household appliances such as refrigerators, washing machines, and air conditioners, and an exterior material of furniture.

1 is a cross-sectional view of a functional film according to the present invention.
2 is a flow chart showing a method of manufacturing a functional film according to the present invention.
3 is a cross-sectional view of a laminated steel sheet according to the present invention.
4 is a flow chart showing a method of manufacturing a laminate steel sheet according to the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification.

Hereinafter, a functional film according to a preferred embodiment of the present invention with reference to the accompanying drawings, and a laminate steel sheet using the same and a method of manufacturing the same are as follows.

1 is a cross-sectional view of a functional film according to the present invention.

1, the functional film according to the present invention includes a functional resin layer 10, a primer layer 20, a PET layer 30 and a surface treatment layer 40. The functional film is adhered to the steel sheet base material 50 to form a laminated steel sheet.

The functional resin layer 10 included in the functional film is positioned above the steel sheet base material 50. The functional resin layer 10 includes a polymer resin and a pigment, and enables various colors to be implemented on a laminated steel sheet. In addition, the functional resin layer 10 serves to increase the clarity of the laminated steel sheet. The clarity is also referred to as smoothness (high glossiness), and when the object is projected onto the surface, the outline of the object is clearly visible without distortion.

The functional resin layer 10 includes a vinyl chloride resin, an acrylic resin and a pigment. The mixing ratio of the vinyl chloride resin and acrylic resin may be approximately 1:1 to 2:1, but is not limited thereto.

The vinyl chloride resin uses vinyl chloride, unsaturated carboxylic acid, and vinyl acetate as monomers. The vinyl chloride-based resin has excellent adhesion to an iron material and can be used for ink binders and adhesives.

The acrylic resin has excellent weather resistance due to its structural properties. The acrylic resin is methyl acrylate, ethyl acrylate, butyl acrylate, isobutyl acrylate, hydroxyethyl acrylate, methyl methacryl Late (methyl methacrylate), ethyl methacrylate, butyl methacrylate, isobutyl methacrylate, allyl methacrylate, ethylene glycol dimethacrylate ( ethylene glycol dimethacrylate, hydroxyethyl methacrylate, glycidyl methacrylate, hexanediol diacrylate, hexanediol dimethacrylate, trimethylo Trimethylopropane trimethacrylate, ethylene-3-ethoxy acrylate, triethylene glycol dimethacrylate, hydroxypropyl acrylate, Hydroxypropyl methacrylate, hydroxybutyl acrylate, ethoxyethyl acrylate, ethoxyethyl methacrylate, ethylhexyl acrylate , Ethylhexyl methacrylate, lauryl acrylate, laur Lauryl methacrylate, ethylene diacrylate, ethyl-3-amino-3-ethoxy acrylate, tertbutyl acrylate), trimethylsilyl methacrylate, tripropylene glycol diacrylate, hexafluoroisopropyl acrylate, hexafluoroisopropyl methacrylate, Phenyl methacrylate, tetraethylene glycol diacrylate, polyethylene glycol phenyl ether acrylate, 2-hydroxy-3-phenoxypropyl acrylate (2- hydroxy-3-phenoxypropyl acrylate, ethylene glycol dicyclopentenyl ether acrylate, ethylene glycol dicyclopentenyl ether methacrylate, sodium acrylate , Sodium methacrylate, tridecyl methacrylate, hexyl acrylate, hexyl methacrylate, isodecyl acrylate, isodecyl methacrylate Isodecyl methacrylate, cyclohexyl methacrylate, benzyl Benzyl methacrylate, benzyl 2-ethyl acrylate, ethyl 2-N-propyl acrylate, zinc acrylate, butanediol di Use acrylate (butanediol diacrylate), butanediol dimethacrylate, vinyl acrylate, vinyl methacrylate, and the like.

The pigments can implement functions such as coloring and hiding, and are included for the purpose of exerting various colors and showing durability of the coated surface. The pigment may be variously selected from TiO ₂ , Al ₂ O ₃ , CaO, carbon black, and ceramic inorganic pigments according to a desired color. TiO ₂ may be used as a white pigment, and chromium (Cr) may be used as a yellow pigment. In addition, carbon black may be used as the black pigment, and iron oxide may be used as the red pigment.

The functional resin layer 10 may further include an additive for imparting spreadability and adhesion, but is not limited thereto.

The thickness of the functional resin layer 10 is preferably 5 ~ 10㎛. If the thickness is less than 5 μm, the thickness may become thin and color implementation may not be sufficient. Conversely, when the thickness exceeds 10 μm, the thickness of the functional film becomes thicker as the thickness becomes thicker, and a gap phenomenon occurs in the functional film.

The primer layer 20 is located on top of the functional resin layer 10. The primer layer 20 is formed between the functional resin layer 10 and the PET layer 30. The primer layer 20 serves to increase the adhesion between the functional resin layer 10 and the PET layer 30. In addition, the primer layer 20 includes a polymer resin and a crosslinking agent, and is excellent in heat resistance and curability.

The polymer resin includes at least one of ester-based resins, acrylic resins, vinyl chloride-based resins, and urethane-based resins.

The ester resin is widely used as a packaging material for various food containers, beverage containers. The ester-based resin is excellent in moldability, mechanical properties and transparency. The ester-based resin is polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polyethylene-2,6-naphthalate, polytrimethylene-2,6-naphthalate, polybutylene -2,6-naphthalate, polyhexamethylene-2,6-naphthalate, polyethylene isophthalate, polytrimethylene isophthalate, polybutylene isophthalate, polyhexamethylene isophthalate, polybutylene adipate terephthalate, etc. Aromatic polyester is used. Among them, it is preferable to use polyethylene terephthalate (PET).

As the above-described acrylic resin, methyl acrylate, ethyl acrylate, methyl methacrylate, and the like can be used.

As the above-mentioned vinyl chloride-based resin, vinyl chloride or the like is used.

The urethane-based resin refers to a copolymer containing at least one urethane bond. Or, the urethane-based resin refers to a segmented copolymer. For example, a polyurethane resin is a reaction product of one or more polyol segments and one or more diisocyanate segments. The polyol includes at least one of polyester polyol and polycarbonate polyol.

The crosslinking agent is an isocyanate-based compound. The isocyanate-based compound contains two or more isocyanate groups (diisocyanate, triisocyanate, tetraisocyanate, etc.). For example, the isocyanate-based compound includes aromatic, aliphatic, and alicyclic diisocyanates.

The isocyanate-based compound is 2,6-toluene diisocyanate, 2,5-toluene diisocyanate, 2,4-toluene diisocyanate, m -phenylene diisocyanate, p -phenylene diisocyanate, methylene bis( o -chlorophenyl Diisocyanate), methylenediphenylene-4,4'-diisocyanate, polycarbodiimide-modified methylenediphenylene diisocyanate, 4,4'-diisocyanato-3,3'-dimethoxybi Aromatic diisocyanates containing at least one of phenyl, 5-chloro-2,4-toluene diisocyanate, and 1-chloromethyl-2,4-diisocyanato benzene. The isocyanate-based compound includes an aromatic-aliphatic diisocyanate containing at least one of m -xylylene diisocyanate and tetramethyl-m-xylylene diisocyanate. In addition, the isocyanate-based compound is 1,4-diisocyanatobutane, 1,6-diisocyanatohexane, 1,12-diisocyanatododecane, 2-methyl-1,5diisocyanatopentane Aliphatic diisocyanate containing the above is included. In addition, the isocyanate-based compound is methylene-dicyclohexylene-4,4'-diisocyanate, 3-isocyanatomethyl-3,5,5-trimethyl-cyclohexyl, isocyanate (isophorone diisocyanate) Alicyclic diisocyanate containing one or more kinds.

On the other hand, the primer layer 20 further includes tetraethylphosphonium benzimidazolide. When the tetraethylphosphonium benzimidazole is further included, the adhesion of the primer layer 20 may be further increased. The tetraethylphosphonium benzimidazole may include 5 to 10 parts by weight based on 100 parts by weight of the polymer resin.

The thickness of the primer layer 20 is preferably 0.5 ~ 1㎛. When the thickness is less than 0.5 μm, the adhesive force between the functional resin layer 10 and the PET layer 30 is lowered. Conversely, when the thickness exceeds 1 μm, the thickness of the functional film becomes thick, and a lifting phenomenon may occur between the functional resin layer 10 and the PET layer 30.

The PET layer 30 is located on top of the primer layer 20. The PET layer 30 is transparent or translucent. The PET layer 30 is in contact with the primer layer 20, it is preferable that one surface of the PET layer 30 in contact with the primer layer 20 is corona treated.

The corona treatment is to modify one surface of the PET layer 30 through corona discharge. Corona's own physical surface modification and chemical surface modification by polar functional groups occur. In chemical surface modification, high-energy electrons or ions collide to generate radicals or ions on the surface, and ozone, oxygen, nitrogen, and moisture around them react to introduce polar functional groups such as carbonyl, carboxyl, and hydroxy groups. Causes surface modification. The surface of the PET layer 30 that has undergone corona treatment has an increased wettability on the surface, thereby increasing adhesion strength. Therefore, the adhesion of the primer layer 20 adhered to one surface of the PTE layer 30 is improved. The adhesion between the PET layer 30 and the primer layer 20 is also increased.

The surface treatment layer 40 is positioned on the PET layer 30. The surface treatment layer 40 provides functional properties such as strengthening of surface properties and antifouling of the functional film. The surface treatment layer 40 is formed from a polyurethane-based surface treatment agent, and may be formed by coating with a comma coating, roll coating, or mesh roll. The surface treatment layer 40 made of a polyurethane-based material may have a beautiful appearance and impart fouling resistance, abrasion resistance, and heat resistance to the functional film.

2 is a flow chart showing a method of manufacturing a functional film according to the present invention.

Referring to Figure 2, using a corona discharge, surface treatment of one surface of the PET layer (S110), forming a surface treatment layer on the other surface of the PET layer (S120), and forming a primer layer (S130) ) And forming a functional resin layer (S140 ).

First, one surface of the PET layer 30 is surface-treated using corona discharge.

One surface of the corona-treated PET layer 30 exhibits excellent adhesion while increasing wettability.

Subsequently, a polyurethane surface treatment agent is applied to the other surface of the PET layer 30 to form the surface treatment layer 40. The application is performed using roll coating or mesh roll.

Subsequently, a primer composition is formed on one surface of the surface-treated PET layer 30 by applying a primer composition. The primer composition includes a polymer resin, a crosslinking agent, and an organic solvent. The polymer resin and the crosslinking agent are as described above.

Here, the primer composition contains an organic solvent such that the solid content is 10 to 30%. The organic solvent is one in which the polymer resin is dissolved, and is a volatile liquid. For example, the organic solvent includes hydrocarbon, alcohol, ether, ketone, and the like.

The primer composition is applied using a spin coating process, a bar coating process, or the like. The primer composition is applied to a thickness of 0.5 ~ 1㎛. After the primer composition is applied, it is dried at 50 to 150°C. When the drying temperature is outside this range, the adhesion of the primer layer 20 may be insufficient and the adhesion may be lowered.

Subsequently, on the primer layer 20, a functional resin composition containing a vinyl chloride resin, an acrylic resin, and a pigment is applied to form a functional resin layer 10. The functional resin composition includes a vinyl chloride resin, an acrylic resin, a pigment and an organic solvent. The functional resin composition contains an organic solvent such that the solid content is 10 to 30%. The organic solvent may be used without limitation as long as the vinyl chloride resin and acrylic resin are dissolved.

The functional resin composition is applied using a spin coating process, a bar coating process, or the like. The functional resin composition is applied to a thickness of 5 ~ 10㎛. After the functional resin composition is applied, it is dried at 50 to 150°C. When the drying temperature is outside this range, the curing of the functional resin layer 10 becomes insufficient, and it may be difficult to exhibit physical properties such as color realization and clarity.

3 is a cross-sectional view of a laminated steel sheet according to the present invention.

3, the laminated steel sheet according to the present invention includes a steel sheet base material 50, a functional film and a hot melt adhesive layer 60. The functional film is located on the top of the base material 50 of the steel sheet. A hot melt adhesive is applied between the steel sheet base material 50 and the functional film to form a hot melt adhesive layer 60. The steel sheet base material 50 and the functional film are adhered by the hot melt adhesive layer 60.

As the base material of the steel sheet 50, any material used in a conventional laminate steel sheet manufacturing process can be applied. For example, the steel plate base material 50 may be a steel plate including a galvanized steel plate, a galvalume steel plate, an aluminum plated steel plate, or an electrogalvanized steel plate.

The hot melt adhesive layer 60 is melted by heat to provide excellent adhesion between the steel sheet base material 50 and the functional film. The hot melt adhesive layer 60 is formed from a hot melt adhesive having a melting temperature of 100 to 300°C.

The hot melt adhesive layer 60 includes at least one of the polyethylene terephthalate adhesive, ethylene vinyl acetate adhesive, polyisobutylene adhesive, polypropylene adhesive, polyester adhesive, polyurethane adhesive, polyimide adhesive, and polyethylene adhesive.

The hot melt adhesive layer 60 further includes tetraethylphosphonium benzimidazole. When the tetraethyl phosphonium benzimidazole is further included, the adhesive strength of the hot melt adhesive layer 60 may be further increased. The tetraethylphosphonium benzimidazole may include 0.1 to 1 part by weight based on 100 parts by weight of the adhesive.

The thickness of the hot melt adhesive layer 60 may be approximately 1 to 10 μm. When the thickness is less than 1 μm, the adhesive force between the steel sheet base material 50 and the functional resin layer 10 is insufficient, and thus the functional film may be easily peeled from the steel sheet base material 50. Conversely, when it exceeds 10 µm, the hardness of the hot-melt adhesive layer 60 is too high, and there is a fear that the workability of the laminated steel sheet is deteriorated.

Matters for the functional film are as described above.

4 is a flow chart showing a method of manufacturing a laminate steel sheet according to the present invention.

Referring to FIG. 4, the laminated steel sheet according to the present invention includes a step of preparing a steel sheet base material (S210), and a step of applying a hot melt adhesive on the steel sheet base material to adhere the functional film (S220).

First, the steel plate base material 40 is provided. Details of the base steel sheet are as described above.

Subsequently, a hot melt adhesive is applied to the steel sheet base material 40 to adhere the functional film. At this time, the functional resin layer 10 included in the functional film is adhered to adjoin the steel sheet base material 40. After applying the hot melt adhesive, the hot melt adhesive is melted by heating at 200 to 300°C. The steel sheet base material and the functional film can be firmly bonded by the melted hot melt adhesive.

As such, the laminated steel sheet has a structure in which a functional film is adhered to the steel sheet base material 40. Since the laminate steel sheet has excellent adhesiveness between layers, it is possible to minimize excitation between layers. In addition, the laminated steel sheet can improve workability and reduce process cost by using a primer layer 20 including a polymer resin and a crosslinking agent, instead of a primer layer using chlorophenol.

Therefore, the method of manufacturing a laminated steel sheet according to the present invention has an effect of improving the manufacturing process by corona treatment and formation of the primer layer 20.

In addition, the laminate steel sheet according to the present invention includes a functional resin layer 10 that exhibits various color senses, and thus has beautiful appearance characteristics, and thus can be applied to exterior materials of household appliances such as refrigerators, washing machines, and air conditioners, and exterior materials of furniture.

Looking at the specific embodiment of the functional film, and the laminated steel sheet using the same as described above are as follows.

1. Manufacture of laminated steel sheet

1) An organic solvent in which 10 parts by weight of 2,6-toluene diisocyanate is added as a crosslinking agent and 100 parts by weight of alcohol and ether are mixed with 100 parts by weight of a resin in which polyethylene terephthalate and methyl acrylate are mixed in a 1:1 ratio. Primer composition was prepared by adding 500 parts by weight.

2) With respect to 100 parts by weight of resin mixed with vinyl chloride and vinyl methacrylate 1:1, 10 parts by weight of carbon black pigment, 5 parts by weight of iron oxide pigment, and 500 parts of organic solvent mixed with alcohol and ether 1:1 A functional resin composition was prepared by adding parts.

Example

After preparing a 30㎛ thick PET film (XP153), corona treatment was performed on one surface of the PET film. On the other side of the PET film, a polyurethane resin was roll coated to form a surface treatment layer.

The primer composition was applied to one surface of the PET film surface-treated with corona using bar coater #3. After application, it was dried at 100° C. for 1 minute to form a primer layer.

Subsequently, the functional resin composition was applied on the primer layer using a bar coater #28. After application, it was dried at 110° C. for 1 minute 30 seconds to form a functional resin layer.

Subsequently, a GI steel sheet from Samyang Steel was prepared. Samhwa hot melt adhesive (polypropylene adhesive) was applied to the surface of the GI steel sheet using bar coater #28. After coating, the mixture was heated at 300° C. for 1 minute and 30 seconds, and the functional film was adhered to a site to which a hot melt adhesive was applied to prepare a laminated steel sheet.

The laminate steel sheets of Examples 1 to 7 were prepared under the conditions described in the above Examples and [Table 1].

[Table 1]

Examples 8 to 11

A laminate steel sheet was prepared under the same conditions as in Example 1, except that the primer layer further included tetraethylphosphonium benzimidazole.

The parts by weight in Table 2 below are parts by weight relative to 100 parts by weight of the resin contained in the primer composition.

[Table 2]

Examples 12 to 15

A laminate steel sheet was prepared under the same conditions as in Example 1, except that the hot melt adhesive layer further included tetraethylphosphonium benzimidazole.

The parts by weight in Table 3 below are parts by weight relative to 100 parts by weight of the polypropylene adhesive.

[Table 3]

Comparative Example 1

A laminate steel sheet was manufactured under the same conditions as in Example 1, except that corona treatment was not performed on one surface of the PET film.

2. Method for evaluating physical properties and results

1) Adhesion evaluation

CCET (Cross Cutting Erichsen Test/Erichen (4mm) taping) was used. When peeling did not occur at all, it was evaluated as "excellent" and peeling occurred as "poor".

2) Evaluation of freshness

According to the DOI meter, when the DOI index was 85 or higher, it was evaluated as "good", when 85 to 70 or higher, "normal", and "bad" when 70 or lower.

3) Evaluation of adhesion heat resistance

The heat-resistant bath constant temperature water bath was maintained at 100°C, a sample was placed in the constant temperature water bath, and after 30 minutes had elapsed, the sample was taken out and washed, and abnormality was observed. When observed with the naked eye, when the functional resin layer and the PET layer are firmly adhered to both the GI steel sheet and the functional resin layer, "excellent", if any one of the peeling occurs, "normal", both peeling When it occurred, it was evaluated as "poor".

4) Adhesion: After attaching the functional film to the GI steel sheet, the adhesive strength was measured at 90° at a rate of 50 mm/min using a TA.XT_Plus Texture Analyzer (Stable Micro System (manufactured)) after 30 minutes had elapsed ( Adhesion at room temperature 25°C)

Relative evaluation criteria: ◎ Excellent, △ Average, × Poor

[Table 4]

^a) Adhesion between functional resin layer and PET layer (gf/in), ^b) Adhesion between GI steel sheet and functional resin layer (gf/in)

Referring to Table 4, it can be seen that the functional film according to the present invention exhibits more than normal effects in terms of adhesiveness, clarity, and adhesion hot water in the laminated steel sheet using the same.

In particular, Examples 8 and 9 further comprising tetraethylphosphonium benzimidazole in the primer layer show a very high adhesion between the functional resin layer and the PET layer. In addition, Examples 12 and 13 further comprising tetraethylphosphonium benzimidazole in the hot-melt adhesive layer show a very high adhesion between the GI steel sheet and the functional film.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and may be manufactured in various different forms, and having ordinary knowledge in the technical field to which the present invention pertains. It will be understood that a person can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10: functional resin layer
20: primer layer
30: PET layer
40: surface treatment layer
50: steel plate base material
60: hot melt adhesive layer

Claims (10)

In the functional film adhered to the steel sheet base material,
The functional film
A functional resin layer comprising a vinyl chloride resin, an acrylic resin and a pigment, and located on the upper portion of the steel sheet base material;
Located on top of the functional resin layer, a primer layer comprising a polymer resin and a crosslinking agent;
A PET layer positioned on the primer layer; And
It is located on top of the PET layer, the surface treatment layer formed from a polyurethane-based surface treatment agent; includes,
One surface of the PET layer in contact with the primer layer is corona treated,
The thickness of the functional resin layer is 5 ~ 10㎛,
The thickness of the primer layer is 0.5 ~ 1㎛,
Functional film characterized in that the crosslinking agent is an isocyanate-based compound.
delete delete According to claim 1,
The polymer resin is a functional film comprising at least one of ester-based resin, acrylic-based resin, vinyl chloride-based resin and urethane-based resin.
delete (a) surface-treating one surface of the PET layer using corona discharge;
(b) forming a surface treatment layer by applying a polyurethane-based surface treatment agent on the other surface of the PET layer;
(c) applying a primer composition comprising a polymer resin and a crosslinking agent to one surface of the PET layer surface-treated by corona discharge, and drying at 50 to 150° C. to form a primer layer having a thickness of 0.5 to 1 μm; And
(d) coating a functional resin composition containing a vinyl chloride resin, an acrylic resin and a pigment on the primer layer, and drying at 50 to 150° C. to form a functional resin layer having a thickness of 5 to 10 μm. and,
The crosslinking agent is a method for producing a functional film, characterized in that an isocyanate-based compound.
Steel plate base material; Functional film located on top of the steel base material; And a hot melt adhesive layer that is applied between the steel sheet base material and the functional film to bond the steel sheet base material and the functional film.
The functional film
Functional resin layer comprising a vinyl chloride-based resin, an acrylic resin and a pigment, located on top of the hot-melt adhesive layer;
Located on top of the functional resin layer, a primer layer comprising a polymer resin and a crosslinking agent; And
A PET layer positioned on the primer layer; And
It is located on top of the PET layer, a surface treatment layer formed from a polyurethane-based surface treatment agent; includes,
One surface of the PET layer in contact with the primer layer is corona treated,
The thickness of the functional resin layer is 5 ~ 10㎛,
The thickness of the primer layer is 0.5 ~ 1㎛,
The crosslinking agent is a laminate steel sheet, characterized in that it is an isocyanate-based compound.
The method of claim 7,
The hot melt adhesive layer is a laminate comprising one or more of polyethylene terephthalate adhesive, ethylene vinyl acetate adhesive, polyisobutylene adhesive, polypropylene adhesive, polyester adhesive, polyurethane adhesive, polyimide adhesive and polyethylene adhesive Grater.
(A) preparing a steel sheet base material; And
(b) applying a hot melt adhesive on the steel sheet base material to adhere the functional film, but adhering the functional resin layer included in the functional film to adjoin the steel sheet base material;
In the step (b), after applying the hot melt adhesive, the hot melt adhesive is heated and melted at 200 to 300° C. to attach a functional film,
The manufacturing method of the functional film
(b1) surface-treating one surface of the PET layer using corona discharge;
(b2) forming a surface treatment layer by applying a polyurethane-based surface treatment agent on the other surface of the PET layer;
(b3) applying a primer composition comprising a polymer resin and a crosslinking agent to one surface of the PET layer surface-treated by corona discharge, and drying at 50 to 150° C. to form a primer layer having a thickness of 0.5 to 1 μm; And
(b4) coating a functional resin composition containing a vinyl chloride resin, an acrylic resin and a pigment on the primer layer, and drying at 50 to 150° C. to form a functional resin layer having a thickness of 5 to 10 μm. And
The crosslinking agent is a method for producing a laminate steel sheet, characterized in that it is an isocyanate-based compound.


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