KR20110021085A - Heat seal adhesion high hardness film for metal - Google Patents

Abstract

PURPOSE: A heat-adhesive film for metal is provided to impart transparent colors and a metal texture in the surface exteriors of electronic products and construction materials and to ensure antifouling properties and abrasion resistance. CONSTITUTION: A heat-adhesive film for metal has a multi-layered structure. The heat-adhesive film for metal is prepared by the steps of: forming a UV hard coating layer with a pencil hardness of 2H or more on the surface a high glossy optical PET film; forming a primer layer for increasing the adhesive force between the UV hard coating and PET film; applying colors using oil-soluble dye or pigment; and coating a thermosetting polyester resin with an adhesive.

Description

Heat Seal Adhesion High Hardness Film For Metal}

The present invention relates to a method of manufacturing a thermally adhesive high hardness film for metals having a multilayer structure, and more particularly, to a surface of a high gloss optical PET film having a transmittance of 30 to 90% or more. UV hard coating step, [Fig. 1] (b) Primer coating step to increase the adhesion between the UV hard coating layer and the PET film, [Fig. 1] (d) Coating the color to be prepared using an oil-soluble dye or pigment 1, (e) a step of coating the thermosetting polyester resin with an adhesive, according to the work process and working conditions can be used as a mixture of ink and adhesive as shown in Figure 2 (d) The present invention relates to a method for producing a transparent, stain-resistant and abrasion-resistant film having a structure.

Currently, plastic and metal materials are widely used as exterior materials for electronic products such as mobile phone exteriors, elevator exteriors, navigation exteriors, and refrigerators. In addition, the design and color of the appearance of the electronic products occupy a very large portion, especially in the case of high-quality products that have a metal texture is spotlighted.

Metal materials aimed at the present invention have excellent wear resistance, heat resistance, and environmentally friendly advantages, but are difficult to manufacture with complex shapes, heavy, and have metallic luster and texture, but have various disadvantages of difficult color implementation.

Due to the recent development of technology, it is possible to produce a complex shape and to produce a thin shape to solve the problem of weight to some extent, but after implementing various colors and processing the shape, the surface treatment to protect the pattern or metal on the exterior is processed. It is complicated and the productivity is bad, resulting in an increase in manufacturing costs.

Therefore, in order to solve the effects and problems as described above, the present invention provides a heat-resistant high-hardness film in the external surface protection of electronic products and building materials, while protecting the metal surface at the same time to improve the metal texture and have a stain resistance and abrasion resistance The purpose is to provide a film.

In addition, the present invention can realize a variety of colors of black or several series while having a beautiful metallic gloss and texture of the metal exterior, it is economical, mass-produced and environmentally friendly metals by not performing additional surface treatment after processing molding It is an object to provide a thermal adhesive high hardness film for the purpose.

The present invention for achieving the above object relates to a method of manufacturing a heat-bonded high hardness film for metal having a multi-layer structure to the surface of a high gloss optical PET film [1] (a) UV hard coating having a soft peel hardness of 2H or more Step 1, (b) Primer step to increase the adhesion between the UV hard coating and PET film, [Fig. 1] (d) Coating the color tone using the oil-soluble dye or pigment, [Fig. 1] (e) coating the thermosetting polyester resin with an adhesive.

Looking at the present invention in more detail as follows.

The heat-bonded high-hardness film for metals of the present invention can be applied to industrial products having a transparent color, contamination, and abrasion resistance at the same time to protect the exterior surface of electronic products and building materials. As no further treatment is required afterwards, it has the advantage of maximizing the functionality given to the film, such as simplification of process, improvement of product mass production, and reduction of manufacturing cost. Especially, it has excellent heat resistance, contamination resistance, bending resistance, and eco-friendliness. Provides thermal bonding high hardness films for metals that can be used in many industrial products.

1 (a) as a hard coating agent capable of imparting high hardness, fouling resistance, and adhesion to a coating film, an unsaturated monomer, oligomer, resin, or those characterized in that it has 2 to 7 functional groups as an ultraviolet curable material. The composition containing these is mentioned. Specific examples thereof include urethane acrylate oligomer 10 to 30% by weight, 5 to 7 functional oligomer, 20 to 40% by weight of 1 to 5 functional monomer, ethoxylated trimethylolpropane triacrylate, photocatalyst 2 to 7 wt% of a reagent, 0.01 to 1.0 wt% of a silicone additive (polyether-modified polydimethylsiloxane), 0.01 to 1.0 wt% of a polymeric fluorine additive, and other solvents methyl isobutyl ketone, isopropyl It consists of alcohol (Isopropyl Alcohol), methyl ethyl ketone, and butyl acetate.

In addition, at least one or more additives, such as silicone additives having a strong surface tension-lowering effect mainly containing polyether modified polydimethylsiloxane and additives for improving surface cleanability based on OH functional silicone modified polyacrylate solution, are added to the hard coating agent. Can be given functionality.

The thickness of the hard coat film is preferably 1-10 μm, particularly preferably 3-7 μm. The coating method may be a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, a microgravure coating method, a curtain coating method and the like. Ultraviolet rays to be irradiated include UV lamps such as high pressure mercury lamps, fusion H lamps, and xenon lamps in the wavelength range of 300 to 400 nm. The irradiation dose is 100 to 500 mJ / m ² .

1, in the case of the primer used in (b), the adhesion between the UV hard coating layer and the PET layer is increased by coating the primer with a polyester resin.

The polyester resin used at this time is characterized in that the molecular weight of 15,000 ~ 20,000, Tg 50 ~ 70 ℃, softening point 120 ~ 140 ℃.

In addition, 5 to 10 parts by weight of polyisocyanate NCO% is further added to 100 parts by weight of the Primer resin of the present invention. Here, the hardening | curing agent is a polyisocyanate-type yellowing type of 15 weight part NCO%.

At this time, 0.1-5 micrometers is preferable and, as for the thickness of a coating film, 0.5-1 micrometer is more preferable.

In the case of the high gloss optical PET film used in (c), thickness (10-50㎛), tensile strength (length and width) 22-26Kg / mm2, elongation (length and width) 200-120Kg / mm2, haze It is preferable to use a film having the characteristics of 1.2%, light transmittance 93%, glossiness 200%, and heat shrinkage (vertical and horizontal) 1.4-0.5%.

[1] In the case of the ink layer used in (d), a color is coated using oil-soluble dyes or pigments, and dyes are collectively referred to as colorants such as fibers, and water and oil in a narrow sense. It refers only to colored substances that are dissolved in and dispersed in single molecules and combined with molecules such as fibers, and are distinguished from pigments that make an opaque colored film on the surface of an object without being dissolved in water and oil and powdered. Depending on the object, the same colored substance (pigment) may be used as a dye, or may be used as a pigment. Here, you can use the synthetic dyes, which are widely known as generalization methods and coupling reactions. Specifically, the oil-soluble dyes are widely used as dyes dissolved in various solvents, synthetic resins and fats and oils and have excellent color development. Pigment may be used, but disadvantages may occur. Resins used together include polyester resins, acrylic vinyl resins, and polyurethane resins. These resins have good adhesion to metals or PET films.

1, the main component of the adhesive coating layer used in (e) is a thermosetting polyester resin using a high molecular weight polyester resin, which is a high molecular compound in which the main chain of the constituent molecules is formed by an ester bond, and more specifically, a molecular weight of 10,000- It is preferable to use 30,000 polyester resin, and the main solvent is a combination of low boiling point and high boiling point solvent such as toluene, methyl ethyl ketone, methyl isobutyl ketone, etc. It is appropriate to use it. At this time, the thickness of the coating film is preferably dry / 5-50㎛, especially 10-20㎛. In addition, 5 to 20 parts by weight of polyisocyanate NCO% may be further added to 100 parts by weight of the polyester resin of the present invention, thereby improving adhesion and heat resistance. In addition, polyurethane resins or epoxy resins may be used, but color may change over time. In particular, high molecular weight polyester resin has excellent mechanical strength and chemical resistance, good adhesion and coating properties to plastics, metals, paper, wood, fibers, etc. This product is harmless to human body in terms of hygiene and environmental hygiene.

In addition, as shown in (d) of FIG. 2, a heat-bonding high hardness film for a metal having a multi-layered structure of the present invention can also be manufactured by mixing ink with an adhesive, thereby further simplifying the process as necessary. There is an advantage.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the scope of the present invention is not limited to the following Examples.

(Example)

Physical properties of the high hardness thermal adhesive film according to the present invention are shown in Table 1 below.

UV hard coating

1. UV raw materials (urethane acrylate oligomer, ethoxylated trimethylolpropane triacrylate monomer, photoinitiator) were adjusted to 50% solids using MIBK and IPA, and applied to PET film and dried. It is about -7 micrometers.

2. The specimen 1 is cured for 50 seconds to 1 minute through a UV irradiator.

Comparison of characteristics by composition

First, Table 2 and Table 3 show the respective properties of the urethane acrylate oligomer and the ethoxylated trimethylol propane triacrylate monomer, respectively.

Properties of the UV hard coating agent according to the present invention according to the raw material composition ratio is as shown in Table 4 below.

Tables 5 and 6 show the respective properties according to the amounts of the additives added to 100 parts by weight of Example 14 with respect to the silicone additives and the polymeric fluorine-based additives, respectively.

Primer coating

1. After adjusting polyurethane and polyester resin to 20% of solid content, mix hardener and remove bubbles.

2. Apply primer on PET film and dry. At this time, the coating film is suitable for dry / 0.5 ~ 1㎛.

Comparison of characteristics by composition

Table 7 shows the characteristics of the polyurethane and polyester resins used in the Primer.

The properties of the adhesive according to the curing agent showed good results as a whole, as shown in Table 8 below. Table 8 shows the results according to the content change in the curing agent added to 100 parts by weight of Example 24.

Ink coating

1. Remove oil bubbles after mixing oil-soluble dye with polyester resin

2. Apply the mixed ink onto the PET film and dry it. At this time, the coating film is suitable for dry / 0.5 ~ 1㎛.

Comparison of characteristics by composition

Table 9 shows each property according to the content of oil-soluble dyes and polyester resins.

In the combination of A and B, the more the content of A, the more the color is blurred to distinguish colors, and the more the content of B, the lower the transmittance and the metal texture cannot be expressed.

Adhesive coating

1.Remove the bubbles after mixing the adhesive with the hardener

2. Apply adhesive to metal or PET film and dry it. At this time, coating film should be 10-20㎛.

3. Lamination of metal and PET film while passing through thermocompression roll with temperature 120 ~ 180 ℃

4. Aging for 1-3 days in 50 ~ 80 ℃ maturation room to stabilize adhesive properties

Comparison of characteristics by composition

Table 10 shows the characteristics of each polyester resin.

The properties of the adhesive according to the present invention according to the composition ratio of each resin are as shown in Table 11 below.

The properties of the adhesive according to the curing agent showed good results as a whole, as shown in Table 12 below. Table 12 shows the results according to the content change in the curing agent added to 100 parts by weight of Examples 42 and 46.

The properties of the adhesive according to the application amount are shown in the following [Table 13], where [Table 13] shows the application amount applied for Example 52 as a dry value.

Although the present invention described above is limited to the above-described embodiments, the present invention is not limited thereto, and the present invention may be easily modified by those skilled in the art. It is obvious that it belongs to the technical idea of the.

The heat-bonded high-hardness film for metals of the present invention can be applied to industrial products having a transparent color, contamination, and abrasion resistance at the same time to protect the exterior surface of electronic products and building materials. As no further treatment is required afterwards, it has the advantage of maximizing the functionality given to the film, such as simplification of process, improvement of product mass production, and reduction of manufacturing cost. Especially, it has excellent heat resistance, contamination resistance, bending resistance, and eco-friendliness. Provides thermal bonding high hardness films for metals that can be used in many industrial products.

1 is a cross-sectional view showing a thermal bonding high hardness film manufacturing process for metals

2 is a structural diagram when forming a heat-bonded high hardness film for metal.

Claims (6)

A. Urethane acrylate oligomer of functional group 5-7 about (a) of FIG.                    B. Ethoxylated Trimethylol Propane Triacryl of Functional Groups 1 to 5                       Rate monomer 30-50 parts by weight of the A. urethane acrylate oligomer; It is composed of 50 to 60 parts by weight of the B. ethoxylated trimethylolpropane triacrylate monomer, having a thickness of 1 to 10 µm, and further adding a small amount of a silicone additive and a polymeric fluorine additive to the mixed A and B. Heat-bonding high hardness film for metal. 1 (b), a polyester resin having a molecular weight of 15,000 to 20,000 and a thickness of 0.1 to 2 µm is added, and 5 to 10 parts by weight of a curing agent is added to 100 parts by weight of polyester resin. At this time, the curing agent is NCO% 15 parts by weight of a polyisocyanate-based non-yellowing type, heat-bonding high hardness film for metals. A high gloss optical PET film, characterized in that the transmittance is 30 to 90% with respect to FIG. 1 (d) is a heat-resisting high hardness film for metal, characterized in that the thickness of 0.1 ~ 1㎛ polyester resin, acrylic vinyl resin, polyurethane resin containing a water-soluble dye or pigment. In Figure 1 (e) A. Polyester resin of molecular weight 16,000-20,000               B. Polyester resins of molecular weight 14,000-18,000               C. Polyester resin of molecular weight 24,000-28,000 40 to 60 parts by weight of A and 10-40 parts by weight of B and 20-50 parts by weight of the above-mentioned C is formed and the thickness is 5-50 micrometers, and 5-20 weight part of hardeners is further added with respect to 100 weight part of mixed A, B, and C. At this time, the curing agent is NCO% 15 parts by weight of a polyisocyanate-based non-yellowing type, heat-bonding high hardness film for metals. 2 (d) adds 1-10% of an oil-soluble dye or pigment to 100 parts by weight of the mixed A, B, and C of claim 5, and has a thickness of 5 to 50 µm. Thermal Bonding Hard Film

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