KR20020063666A - Solar control Film - Google Patents

Abstract

PURPOSE: Provided is a control film against sunlight which includes an oxidation prevention layer to prevent oxidation by moisture absorption so that it helps to improve durability in appearance. CONSTITUTION: In the control film against sunlight wherein a surface protection layer(111), a support for plastic film(112), a metal deposition layer(113), a decompressing adhesion layer(114) and a releasing film(115) are piled up sequentially, the control film against sunlight is characterized by including the oxidation prevention layer(116) between the metal adsorption layer and the decompressing deposition layer which consists of epoxy resin and acryl resin.

Description

Solar control film {Solar control Film}

The present invention relates to a solar control film, and more particularly, a solar control film attached to a glass such as a car, a building, an exhibition hall, and the like to control the sun's rays and prevent a second accident caused by the destruction of a window during an accident. It is about.

Solar control film due to recent demands for energy saving, increase of air-conditioning efficiency, natural disasters such as earthquake, prevention of car glass scattering in traffic accident, prevention of fading of furniture and decoration of building nap, protection of personal privacy, and beautiful appearance This is widely used.

A schematic cross section as an example of a conventional solar control film is shown in FIG. 1. Here, the surface protective layer 1, the polyethylene terephthalate support film 2, the metal deposition layer 3, the pressure-sensitive adhesive layer (4) and the release film (5) has a structure that is sequentially stacked.

Specifically, the conventional solar control film is coated on the plastic support film (2) by putting a color disintegrating dye in the pressure-sensitive adhesive layer (4), or when the metal deposition layer (3) is a conventional plastic support film ( 2) a metal deposition layer (3) on the pressure-sensitive adhesive layer (4) on it was a control film that one color appears flat.

However, when the pressure-sensitive adhesive layer 4 is placed on the metal deposition layer 3, moisture is absorbed by the detergent used during construction, and the metal deposition layer is partially oxidized by the absorbed moisture, resulting in poor aesthetics.

Thus, the inventors of the present invention in the solar control film laminated a pressure-sensitive adhesive layer on the metal deposition layer, while trying to prevent the oxidation of the metal deposition layer, provided with a separate antioxidant layer between the metal deposition layer and the pressure-sensitive adhesive layer. As a result, it was found that oxidation of the metal deposition layer by moisture can be prevented without deteriorating other effects, thereby completing the present invention.

Accordingly, an object of the present invention is to provide a solar control film excellent in durability of the appearance by being treated with an anti-oxidation layer to prevent oxidation of the metal deposition film by moisture.

The solar control film of the present invention for achieving the above object has a structure in which a surface protective layer, a plastic film support, a metal deposition layer, a pressure-sensitive adhesive layer and a release film are sequentially stacked, but a metal deposition layer and a reduced pressure It is characterized in that the anti-oxidation layer made of an epoxy resin and an acrylic resin is provided between the adhesive layers.

1 is a cross-sectional view of a conventional general solar control film,

2 is a cross-sectional view of the solar control film prepared according to the present invention.

<Detailed Description of Major Symbols in Drawing>

10, 100-Solar control film 1, 111-Surface protection layer

2, 112-polyethylene terephthalate 3, 113-metal deposition layer

4, 114-pressure-sensitive adhesive layer 5, 115-release film

116-antioxidant layer

The present invention will be described in more detail as follows.

The solar control film according to the present invention will be described in detail with reference to FIG. 2.

The structure of the solar control film of the present invention is the same as the conventional solar control film shown in Figure 1 most of the layer structure, the surface protective layer 111, the plastic film support 112, the metal deposition layer 113, The pressure-sensitive adhesive layer 114, and the release film 115 has a stacked structure sequentially. However, the solar control film of the present invention is provided with an anti-oxidation layer 116 between the metal deposition layer 113 and the pressure-sensitive adhesive layer 114 to prevent oxidation of the metal deposition layer.

The other layering elements, including the antioxidant layer 116, are described in more detail below.

(1) antioxidation layer (116)

The antioxidant layer of the present invention aims to prevent oxidation of the metal deposition layer due to contact with moisture and air.

In the case of the solar control film omitting this layer, the pressure-sensitive adhesive layer is directly applied to the metal deposition layer. In this case, the metal deposition layer is oxidized by the moisture penetrating the pressure-sensitive adhesive layer during construction. As a result, the appearance of the surface is severely damaged.

In order to prevent the oxidation of the metal deposition layer in the past, a method of using a plastic film support as a double layer was used, but in this case, it is a factor that increases the production cost due to excessive consumption of the film.

Therefore, in the present invention, as part of a more efficient method, an antioxidant layer is provided between the metal deposition layer and the pressure-sensitive adhesive layer, and the antioxidant layer refers to a resin coating layer which prevents the metal deposition layer from being permanently oxidized.

The resin constituting the antioxidant layer is mixed with an epoxy resin having excellent film forming ability, excellent adhesion with a metal deposition layer, and having a high crosslinking density and an acrylic resin having a function of softening surface properties.

The epoxy resin which can be used here is an average molecular weight 2,000-20,000, Preferably it is 4,000-15,000. If the average molecular weight of the epoxy resin is less than 2,000, the curing time is long and the hardness of the coating film is insufficient. If it is larger than 20,000, the film is so hard that the applied film is not flexible.

And it is suitable that the acrylic resin used with an epoxy resin is 50,000-500,000 in average molecular weight. If the molecular weight is less than 50,000, the compatibility with epoxy resin is excellent, but the molecular weight is too low, making the surface sticky. If it is larger than 500,000, the compatibility with the epoxy resin is lowered, resulting in poor uniformity of the coating film.

When mixing an acrylic resin and an epoxy resin, it is preferable that the weight ratio of an epoxy resin / acrylic resin is 3/7-7/3.

If the mixing ratio is less than 3/7, the curing density is lowered and the chemical resistance is lowered. If the mixing ratio is more than 7/3, the surface crosslinking density is decreased, resulting in poor surface properties such as stickiness.

Examples of the curing agent for acrylic resins include melamine formaldehyde, urea formaldehyde, polyisocyanate, modified polyisocyanate, polyaziridine, zirconium composite, epoxy, zinc oxide, magnesium oxide, and the like, of which polyisocyanate is preferred.

In addition, the coating thickness is important in order to show the characteristics of the coating film, the coating thickness applicable to this is preferably 0.2 to 10㎛. More preferably, it is 0.5-5 micrometers. If the thickness is less than 0.5 mu m, sufficient metal deposition film protection is not achieved, and if the thickness is larger than 5 mu m, the thickness is too thick and the surface flexibility is insufficient, which is easy to break.

In order to maximize the effect of the antioxidant layer, it is important to form a continuous film as a thin film.

In addition to the above-described antioxidant layer, the surface protection layer, the plastic film support, the metal deposition layer, and the pressure-sensitive adhesive layer constituting the solar control film of the present invention will be described.

(2) Surface protective layer (111)

The surface protective layer provided the wear resistance of the plastic film support body 112, and forms the rigid film of 0.1-5 micrometers in coating thickness.

The surface protective layer composition is composed of a photocurable oligomer, a photoinitiator, a diluent, etc., wherein the photocurable oligomer is urethane acrylate, urethane methacrylate, epoxy acrylate, epoxy novolac acrylate, polyester acrylate, polybutadiene di Acrylate, polyester urethane acrylate, etc. are mentioned.

Benzyldimethyl ketal, benzoin butyl ether, trimethyl benzophenone, alpha hydroxy ketone, ethyl 4- (dimethylamino) benzoate, benzophenone, hydroxyl alkylacetophenone, etc. are suitable as a photoinitiator.

Such a surface protective layer composition is applied and pre-dried on a plastic film support, and then hardened by UV light to obtain a hard coating having excellent wear resistance.

(3) plastic film support 112

As the plastic film support, a polyethylene terephthalate biaxially oriented film is used, and a transparent or dyed film having a thickness of 10 to 100 µm is suitable. By the way, in the case of the transparent film it should be colored using a dye in the pressure-sensitive adhesive layer to be able to control the sunlight.

(4) metal deposition layer (113)

The metal deposition layer utilizes the reflective properties of the metal and deposits 99.9% purity aluminum on a plastic film support by resistive heating in a high vacuum atmosphere of 2 × 10 ^-5 torr, thereby reflecting the hot rays while properly controlling the visible light transmittance. Can be.

(5) pressure-sensitive adhesive layer (114)

The composition of the pressure-sensitive adhesive layer is composed of an acrylic resin, a curing agent, a ultraviolet absorber, a dye, a stickiness control agent, a solvent and the like.

Here, the acrylic resin is methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, itaconic acid, hydroxyethyl methacrylate, Hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, metyrolacrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate, 2-ethylhexyl acrylate polymer, Copolymers, terpolymers, and the like.

In addition, in order to maximize the effect of the present invention, it is good to have excellent water resistance of the pressure-sensitive adhesive layer, and for this, it is preferable to use a curing agent. The curing agent includes melamine formaldehyde, urea formaldehyde, polyisocyanate, polyaziridine, zirconium composite, epoxy, zinc oxide, magnesium oxide and the like.

The ultraviolet absorber in the coloring pressure reducing layer composition serves to prevent fading by blocking ultraviolet rays in the wavelength range of 300 to 400 nm in sunlight. Preferred ultraviolet absorbers include 2-hydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, 2-hydroxy-methoxy-5-sulfobenzophenone trihydrate, 2-hydroxy-4-normal octoxy benzophenone, 2-hydroxy-5-t-octylphenylbenzotriazole, and the like, and commercialization. Examples include CYASORB UV9, UV24, UV207, UV284, UV531, UV1084, UV2300, UV5411 from CYNAMID, CHIMASSORB 81, 90, TINUVIN P, 328, 900, 292, 622, 765, 770, and 144 from CIBA-GEIGY. .

The pressure-sensitive adhesive layer is composed of 100 parts by weight of an acrylic resin, 5 parts by weight of a curing agent, 1 part by weight of an ultraviolet absorber, an appropriate amount of a dye and a solvent, and applied to the plastic film and dried to form a layer.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by the Examples.

Examples 1-4

The surface protective layer coating composition as shown in Table 1 was applied directly to the metal deposition layer qkseoas of a biaxially stretched polyethylene terephthalate film (Kolon, Astroll) having a thickness of 25 μm with a metal deposition layer and dried for 10 seconds at an 80 ° C. hot air oven. After treatment with a Fusion distance UV curing device (Model DRS 1210 + F455-20) at an irradiation distance of 5cm and a feed rate of 5m / min, the oxide protective layer shown in Table 1 was then applied onto the metal deposition layer at 150 ° C for 2 minutes. After drying, the pressure-sensitive adhesive layer was applied thereon, and dried, and the release film was aged at 50 ° C. for 7 days to obtain a solar control film as shown in FIG. 2.

Comparative Examples 1 to 3

The solar control film was prepared in the same manner as in the above example, except that the antioxidant layer composition was changed as in Table 1 below.

(Unit: parts by weight) Example Comparative example One 2 3 4 One 2 3 Antioxidant layer Epoxy Resin ⁽¹⁾ (Mw = 10,000) 3 5 7 6 9 8 2 Acrylic Resin ⁽²⁾ 7 5 3 4 One 2 8 Polyisocyanates ⁽³⁾ 0.2 0.2 0.2 0.2 0.1 0.1 0.2 Methyl ethyl ketone 40 40 40 40 40 40 40 toluene 40 40 40 40 40 40 40 Coating thickness (㎛) 3 0.5 2 One 0.1 6 7 Surface protective layer Urethane acrylate 50 Benzyldimethyl ketal 4 Methyl ethyl ketone 10 Ethyl acetate 10 Pressure-sensitive adhesive layer Acrylic terpolymers ⁽⁴⁾ 100 Polyisocyanate 5 Tinuvin 292 One Methyl ethyl ketone 20 Ethyl acetate 30 (1) Kukdo Chemical Co., Ltd. (2) Aekyung Chemical Co., Ltd. (3) Soluble dye of Clariant Co., Ltd. (4) 2-ethylhexyl acrylate / methyl methacrylate / acrylic acid terpolymer (5) Ciba-Geigy UV Absorbent

The degree of oxidation, adhesion, and visible light transmittance of the metal deposition film of the solar control film obtained according to the above Examples and Comparative Examples were measured, and the results are shown in Table 2 below.

Example Comparative example One 2 3 4 One 2 3 Oxidation Area (㎠ / ㎡) 0 0 0 0 10 7 8 Adhesive force (g / inch) 500 500 500 500 500 500 500 Visible light transmittance (%) 25 55 30 45 70 5 5

From the results of Table 2 above, in the case where an anti-oxidation layer containing an epoxy resin and an acrylic resin in a weight ratio of 3/7 to 7/3 is provided between the metal deposition layer and the pressure-sensitive adhesive layer at a predetermined thickness, the metal deposition While preventing the oxidation of the layer, it can be seen that the basic performance of the solar control film such as adhesion to the glass surface or visible light transmittance is not deteriorated.

However, when the thickness of the antioxidant layer is too thick, it can be seen that the visible light transmittance significantly drops.

As described in detail above, according to the present invention, the surface protection layer, the plastic film support, the metal deposition layer, the pressure-sensitive adhesive layer, and the release film are oxidized due to the moisture penetration through the pressure-sensitive adhesive layer on the solar control film sequentially laminated. When the anti-oxidation layer having a mixture of an epoxy resin and an acrylic resin is provided for prevention, it is possible to provide a solar control film excellent in durability of the appearance by preventing oxidation of the metal deposition layer by moisture.

Claims (4)

In the solar control film having a structure in which a surface protective layer, a plastic film support, a metal deposition layer, a pressure-sensitive adhesive layer and a release film are sequentially stacked, The solar control film, characterized in that the anti-oxidation layer made of an epoxy resin and an acrylic resin is provided between the metal deposition layer and the pressure-sensitive adhesive layer. The solar control film according to claim 1, wherein the antioxidant layer contains an epoxy resin and an acrylic resin in a 3/7 to 7/3 weight ratio and contains a curing agent. 3. The solar control film of claim 2, wherein the curing agent is polyisocyanate. The method of claim 1, wherein the antioxidant layer is a solar control film, characterized in that formed to a thickness of 0.5 to 5㎛.