KR100228433B1 - Coloured film for solar control - Google Patents

Abstract

The present invention relates to a solar light control film, which is attached to the glass of a car, a building, or an exhibition hall to control the sun's rays, and a solar light control film that can prevent secondary accidents due to glass breakage during an accident. A protective layer composed by mixing acrylate, polyester acrylate, vinylpyrrolidone and photoinitiator at a constant ratio and adding polyurethane and polysiloxane resin to it, without surface scratching during construction or use Product productivity can be improved by improving the dimensional stability of the base film during film production and improving the surface slip property at the time of winding.

Description

Sunlight Control Film

The present invention relates to a solar light control film, and more particularly, it is attached to a glass such as a car, a building, or an exhibition hall to control the sun's rays, and prevent secondary accidents due to glass breakage during an accident. It relates to a solar light control film.

In recent years, various solar light control films have been used for energy saving and natural disasters such as earthquakes, preventing the scattering of automobile glass during traffic accidents, preventing fading of furniture and decorations inside buildings, and protecting personal privacy. It is becoming.

As shown in FIG. 1, the solar control film generally includes a protective layer 11, a plastic support film layer 12, a metal deposition layer 13, a pressure-sensitive adhesive layer 14, and a release film 15. The protective layer has been designed and applied for the purpose of suppressing surface scratches generated during construction or use on glass surfaces.

However, the protective layer designed for this purpose has many problems such as deformation due to poor dimensional stability of the base film when forming the protective layer in the overall film production process and deformation of the winding due to poor slip property during winding. I had.

In other words, the cured protective layer causes a problem of lowering the overall stability of the solar control film, and wasted a lot of time and manpower when manufacturing the product.

In general, the protective layer of the solar light control film is made of polyurethane acrylate, polyester acrylate, vinylpyrrolidone, photoinitiator and the like, in the case of these compositions are not formulated to effectively exhibit the action of each composition, scratch resistance There was a problem of satisfactory but poor dimensional stability at the time of product production and poor slip performance at the time of winding, thereby lowering productivity.

An object of the present invention is to solve the problem of the productivity of the solar control film having a protective layer as described above, while ensuring the dimensional stability of the base film during the production and winding while suppressing surface scratches occurring during construction or use The present invention provides a solar control film having a protective layer having excellent slip properties.

1 is a cross-sectional view showing the structure of a conventional solar control film,

2 is a cross-sectional view showing a state in which the solar light control film is applied to glass.

Detailed description of symbols for major parts of drawings

11-protective layer 12-plastic support film layer

13-metal deposition layer 14-pressure-sensitive adhesive layer

15-Release Film 20-Glass Plate

The solar control film according to the present invention is made by sequentially laminating a protective layer, a plastic support film layer, a metal deposition layer, a pressure-sensitive adhesive layer and a release film layer, wherein the protective layer is a polyurethane acrylate, polyester acrylate, vinyl It is characterized in that the pyrrolidone and photoinitiator consist of a mixture, polyurethane and polysiloxane mixed in a weight ratio of 3 to 8: 1 to 4: 1 to 4: 0.05 to 0.4.

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

In the present invention, the overall structure of the solar light control film is as shown in FIG. 1, but the structure of the protective layer 11 is renewed to suppress the occurrence of surface scratches during construction or use, while having excellent dimensional stability of the base film during production. The surface slipperiness at the time of winding up improves the productivity of the product.

The protective layer of the solar light control film of the present invention is composed of polyurethane acrylate, polyester acrylate, vinyl pyrrolidone, polyurethane resin, polysiloxane resin and photoinitiator, wherein polyurethane acrylate, polyester acrylate and vinyl Pyrrolidone serves to prevent the occurrence of scratches on the surface.

In addition, the polyurethane resin and the polysiloxane resin play a role of imparting excellent slidability during dimensional stability and winding of the base film.

At this time, the mixing ratio of the polyurethane acrylate, polyester acrylate, vinylpyrrolidone and the photoinitiator which plays a role of imparting scratch resistance is preferably from 3 to 8: 1 to 4: 1 to 4: 5: 0.0 to 0.4 by weight. In the case of such a resin mixing ratio, it may have an appropriate adhesive strength and scratch resistance with the base film after being coated on the base film.

If the content of vinylpyrrolidone exceeds the above range, the scratch resistance is lowered, and if the content of the vinylpyrrolidone is less than the above range, it is difficult to form a uniform film.

On the other hand, the polyurethane resin constituting the protective layer of the present invention is a polymer having a weight average molecular weight of 1,000,000 or less, preferably 500,000 or less, and a polysiloxane resin is a polymer having a weight average molecular weight of 500,000 or less, more preferably 150,000 or less.

Polyurethane resins and polysiloxane resins have excellent solubility in solvents, thereby preventing deformation of the base film by providing excellent film forming ability during coating, dimensional stability of the base film after coating, and excellent slip property during winding.

Therefore, in order to have scratch resistance, dimensional stability and slip resistance of the solar light control film according to the present invention, a mixture of the above-mentioned polyurethane acrylate, polyester acrylate, vinylpyrrolidone and photoinitiator, polyurethane resin and polysiloxane resin It is preferable to limit the content ratio of 5-9: 0.5-3: 0.1-1 weight ratio.

At this time, if the mixing ratio is less than 5: 0.5: 1, the scratch resistance is inferior, and if it exceeds 9: 3: 1, the dimensional stability of the substrate and slip property at the time of winding are poor.

The solar control film according to the present invention is prepared by dissolving the protective layer 11 composition as described above in an organic solvent and uniformly coated on the plastic support film layer 12 to produce a solar control film, wherein the drying of the protective layer It is preferable that the thickness is 0.2-6 micrometers.

If the thickness of the protective layer is less than 0.2㎛ after coating, it is difficult to form a continuous film and scratch resistance, and if it exceeds 6㎛ there is a problem in the adhesive strength and the dimensional stability of the plastic support film layer.

The solar control film of the present invention is composed of a plastic support film layer 12, a metal deposition layer 13, a pressure-sensitive adhesive layer 14, and a release layer 15, in addition to the above-described protective layer, as in the usual structure. As the plastic support film layer, a polyethylene terephthalate biaxially oriented film is used. More specifically, a transparent or dyed film having a thickness of 10 to 100 µm is suitable.

In the case of the transparent film, the dye should be colored in the pressure-sensitive adhesive layer to control the sunlight.

The metal deposition layer 13 utilizes a reflective property of metal, and deposits aluminum having a purity of 99.99% by a resistance heating method in a high vacuum atmosphere of 2 × 10 ^-6 Torr to reflect the hot ray while properly controlling the visible light transmittance. do.

The pressure-sensitive adhesive layer 14 composition is composed of an acrylic resin, a curing agent, a UV absorber, a dye, a sticking agent, and a solvent.

At this time, as the acrylic resin, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, N-butyl methacrylate, N-butyl methyl methacrylate, acrylic acid, methacrylic acid, itaconic acid, hydroxyethyl meth Acrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, methylol acrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, N-butyl acrylate and 2-ethylhexyl Polymers selected from acrylates, copolymers thereof, or terpolymers thereof can be used.

In order to maximize the effect of the present invention, the water resistance of the pressure-sensitive adhesive layer 914 should be excellent, and it is preferable to use a curing agent.

In this case, as the curing agent, melamine formaldehyde, urea formaldehyde, polyisocyanate, polyaziridine, zirconium composite, epoxy compound, zinc oxide or magnesium oxide may be used.

Meanwhile, the ultraviolet absorbent in the pressure-sensitive adhesive layer composition serves to prevent fading by blocking ultraviolet rays in the 300-400 nm wavelength range in sunlight, and 2-hydroxy-4-methoxybenzophenone and 2,2'-dihydride. Hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone trihydrate, 2-hydroxy- 4-N-octoxy benzophenone or 2-hydroxy-5-t-octylphenylbenzotriazole and the like.

The content ratio of the composition of the pressure-sensitive adhesive layer 14 of the present invention is composed of 100 parts by weight of the acrylic resin, 5 parts by weight of the curing agent, 1 part by weight of the ultraviolet absorber, an appropriate amount of dyes and solvents, and the protective layer 11, plastic support The film layer 12 is applied to the metal deposition layer 13, which is sequentially stacked, and dried to produce a solar control film of the present invention.

When the solar control film prepared as described above is applied to a glass window or the like, as shown in FIG. 2, the release layer is peeled off and the pressure-sensitive adhesive layer is laminated on the glass surface.

Hereinafter, the present invention will be described in detail as follows, but the present invention is not limited by the examples.

Examples 1-4 and Comparative Examples 1-4

Apply a protective layer coating composition as shown in Table 1 on one side of a biaxially stretched polyethylene terephthalate film (Kolon Astroll) having a thickness of 25 μm, and dry it in an 80 ° C. hot air oven for 10 seconds, followed by an ultraviolet curing device. (Model DRS120 + F455-20, manufactured by Fusion, USA) was treated under conditions of 5 cm irradiation distance and 10 m / min feed rate.

Then, a high-pressure 99.99% aluminum in a high vacuum of 5 × 10 ^-6 Torr was vacuum deposited to the opposite side of the protective layer-coated film to a thickness of 50 kPa, and then the pressure-sensitive adhesive layer coating composition having the composition as shown in Table 1 below. After drying, it was applied and dried to a thickness of 10 μm.

Then, a release film was laminated on the pressure-sensitive adhesive layer and aged at 50 ° C. for 7 days to prepare a solar control film of the present invention.

On the other hand, the wear resistance, slip properties, dimensional stability, adhesion, protective layer adhesion, visible light transmittance and UV blocking rate for the solar control film prepared as described above are shown in Table 2 below.

At this time, the wear resistance was rubbed the protective layer film 10 times with steel wool and then peeled off the release film to measure the Hazy of the sample in the total light measuring device, the slip property after passing through the photoreactor until the slip property appeared Measured by time.

Dimensional stability is a measure of the shrinkage of the film after passing through the photoreactor, adhesive force is sprayed with water evenly sprayed on a glass plate, and then pressed and dried the solar control film (width 1inch, 15cm in length) removed the release film After leaving for 1 day, the measured value was measured under the condition of 50mm / min of tensile speed in instron.

And the protective layer adhesive force was crimped | bonded by the Scotch tape (3M product, width 18mm) on the protective layer surface, and the contact surface was peeled off. ◎, 1 to 25% peeled ○, 26 to 50% peeled △, and 1 to 50% or more peeled were indicated by ×.

Visible light transmittance was measured by peeling the release film with an all-light transmittance measuring device (model name NDH-100D P, manufactured by Nippon Color Co., Ltd.) and measuring the visible light transmittance.

Finally, the UV blocking rate was measured by peeling the release film with an ultraviolet-visible spectrophotometer (SHIMADZU, model name UV-260) and then measuring the blocking rate at 360 nm.

Example (parts by weight) Comparative Example (parts by weight) One 2 3 4 One 2 3 Protective layer Polyurethaneacrylate ⁽¹⁾ 50 50 50 50 70 30 50 Polyester acrylate ⁽¹⁾ 30 30 30 30 30 70 30 Vinylpyrrolidone ⁽¹⁾ 20 20 20 20 50 20 20 Photoinitiator ⁽²⁾ 3 3 3 3 3 3 3 Polyurethane ⁽³⁾ 10 10 10 10 10 10 15 Polysiloxanes ⁽⁴⁾ 8 15 8 15 8 8 - Methyl ethyl ketone 20 20 20 20 20 20 20 Ethyl acetate 20 20 20 20 20 20 20 Pressure-sensitive adhesive layer Acrylic Terpolymer ⁽⁵⁾ 100 100 100 100 100 100 100 Polyisocyanate 5 5 5 5 5 5 5 UV absorbers One One One One One One One Methyl ethyl ketone 20 20 20 20 20 20 20 Ethyl acetate 30 30 30 30 30 30 30 Savinyl Brown ⁽⁶⁾ - - 0.2 0.2 - - - Savinyl Black ⁽⁷⁾ - - 0.5 0.5 - - - (1) Japan Nippon Inks Co., Ltd. (2) Benzyl dimethyl ketal, Nippon Inks Co., Ltd. (3) Dongsung Chemical Company (4) Dow Corning Co. Acrylic terpolymer (6) CIBA-GEIGY, Tinuvin292 (6) Oil-soluble dye of SANDOS

Example Comparative Example One 2 3 4 One 2 3 Metric color silver silver grey grey silver silver silver Adhesive force (g / inch) 250 300 300 300 350 450 300 Visible light transmittance (%) 45 45 35 35 46 46 46 UV protection rate (%) 98 98 98 98 98 98 98 Protective layer adhesion ◎ ◎ ◎ ◎ △ ◎ ◎ Wear resistance (%) 2 2 2 2 25 30 2 Slip property (seconds) 2 2 2 2 8 25 27 Dimensional stability (%) One 2 2 2 10 5 3

From the results of Table 2, the content ratio of the polyurethane acrylate resin according to the present invention; polyester acrylate resin: vinylpyrrolidone: photoinitiator is from 3 to 8: 1 to 4: 1 to 4: 0.05 to 0.4 by weight, In the case of the solar control film composed of a protective layer composed of a mixture of these mixtures and a polyurethane and a polysiloxane of 5-9: 0.5-3: 0.1-1, it is possible to improve productivity by improving slip property and dimensional stability while satisfying abrasion resistance. On the other hand, it can be seen that if the content ratio is outside the scope of the present invention, the slip properties, dimensional stability can not be improved.

As described in detail above, as in the present invention, a polyurethane acrylate, polyester acrylate, vinylpyrrolidone and photoinitiator are mixed at a constant mixing ratio, and a protective layer prepared by adding polyurethane and polysiloxane is provided thereto. One solar control film is excellent in wear resistance, dimensional stability is secured and has an excellent slip property when winding up, thereby improving the productivity in film production.

Claims (3)

In the solar control film formed by sequentially laminating a protective layer, a plastic support film layer, a metal deposition layer, a pressure-sensitive adhesive layer and a release film layer, the protective layer is polyurethane acrylate, polyester acrylate, vinylpyrrolidone and A solar control film, characterized in that the photoinitiator is composed of a mixture, polyurethane and polysiloxane mixed in a weight ratio of 3 to 8: 1 to 4: 1 to 4: 0.05 to 0.4. The method of claim 1, wherein the content ratio of the mixture, polyurethane and polysiloxane is 5 to 9: 0.5 to 3: 0.1 to 1 weight ratio, characterized in that the solar control film. The method of claim 1, wherein the thickness of the protective layer is a solar control film, characterized in that the 0.2 to 6㎛.

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