KR100306920B1 - Film controlling sun light - Google Patents

Abstract

PURPOSE: Provided is a film attached to the car window or various displaying windows so that sun light is controlled and preventing the second damage by the scattered pieces of glass when the windows are broken. CONSTITUTION: The film comprises: a detachable film, a surface treating layer of 0.1-5 micrometer-thickness comprised of cellulose acetate propionate resin and polyvinylpyrrolidone resin in a weight ratio of 1:1-1:5, a pressure adhesive layer, a plastic support film and a protecting film. A metal vapor deposit layer on the side of the plastic support film faces the pressure adhesive layer.

Description

Solar control film

1 is a schematic enlarged cross-sectional view showing the structure of a conventional general solar control film.

Figure 2 is a schematic enlarged cross-sectional view showing the structure of the solar control film according to an embodiment of the present invention.

FIG. 3 is a schematic enlarged cross-sectional view illustrating a state in which the solar control film of FIG. 2 is applied to a glass plate. FIG.

* Explanation of symbols for main parts of the drawings

10, 20: solar control film 11, 21: protective layer

12, 22: plastic support film 13, 23: metal deposition layer

14, 24: pressure-sensitive adhesive layer 15, 25: release film

16, 26: surface treatment layer 30: glass plate

The present invention relates to a solar control film attached to a glass window of a car, a building, or various exhibitions to control solar rays and to prevent a second accident caused by fragments when glass breaks due to an accident, in particular, adhesion of a pressure-sensitive adhesive layer The present invention relates to a solar control film without surface stickiness due to the ability.

In order to save energy in recent years, it is possible to prevent the scattering of glass fragments due to natural disasters such as earthquake or earthquake or traffic accident, or to prevent fading by ultraviolet rays such as indoor furniture or decoration, or to secure personal privacy space. For this reason, the application of solar tube control film has been developed in various ways.

As shown in FIG. 1, the conventional general solar control film 10 includes a pressure-sensitive adhesive layer 14, a metal deposition film 13, and a plastic support film that are sequentially stacked on the lowermost release film 15. 12) and the protective layer 11. The conventional solar control film has been pointed out as a problem in that the surface is sticky by the pressure-sensitive adhesive layer when it is attached to the glass window, as well as difficulty in the construction and peeling off the release film. In other words, even if water is well sprayed on the glass surface during construction, the surface is too sticky, making it difficult to adjust the position of the film for accurate construction, and when the release film is peeled off, the marks left on the support film cause fatal defects in appearance. to be.

Accordingly, an object of the present invention is to provide a solar control film having excellent construction workability because the release film is easily peeled off and is not sticky during construction.

In order to achieve the above object, the solar control film of the present invention comprises a surface treatment layer, a pressure-sensitive adhesive layer, an optional metal deposition layer, a plastic support film, and a protective layer, which are sequentially laminated on the lowermost release film. And the surface treatment layer is a mixed resin of cellulose acetate propionate resin and polyvinylpyrrolidone resin.

Hereinafter, the present invention will be described in more detail with reference to the drawings showing preferred examples.

The solar control film 20 of the present invention shown in FIG. 2 includes a surface treatment layer 26, a pressure-sensitive adhesive layer 24, and a metal deposition layer 23 sequentially laminated on the lowest release film 25. ), A plastic support film 22 and a protective layer.

In the solar control film 20 of the present invention, since the surface treatment layer 26 is made of a mixed resin of cellulose acetate propionate resin and polyvinylpyrrolidone resin, it is aqueous and surface is not sticky. This is extremely excellent and the appearance of the support film does not occur when peeling off the release film 25 is also excellent. That is, the cellulose acetate propionate resin in the constituents of the surface treatment layer 25 is dry and has excellent film forming ability to impart releasability. The polyvinylpyrrolidone resin dissolves well in water during construction so that the glass and the pressure-sensitive adhesive layer 24 are separated. In lubrication layer role and serves to give adhesion.

In the present invention, the cellulose acetate propionate resin constituting the surface treatment layer 25 is dissolved in water and an alcohol mixed solvent system, and has a number average molecule ( ) If the content of about 5,000 to 50,000 hydroxyl% is more than 1%, it is appropriate. Cellulose acetate propionate resin should be dissolved in water / alcohol mixed solvent to help the role of lubrication layer and the adhesion of pressure-sensitive adhesive layer during construction, and to achieve uniform and continuous thin film when molecular weight is within the above range. Too low a hydroxyl content results in poor solubility in the water / alcohol mixed solvent.

Polyvinylpyrrolidone resin, which is another material constituting the surface treatment layer 25 in the present invention, has a weight average molecular weight ( ) Is 3 million or less, more preferably 1.5 million or less. Since polyvinylpyrrolidone resin has excellent solubility in water, it provides excellent lubrication and adhesion during construction and gives a sticky feel to the surface after drying.

In the present invention, the composition ratio of the two resins is preferably cellulose acetate propionate: polyvinyl pyrrolidone = 1: 1 to 1: 5 by weight. When the composition ratio is less than 1: 1, the adhesive strength and lubricity are insufficient, and when the composition ratio is greater than 1: 5, the thin film forming ability is difficult and the releasability is poor.

As such, when the surface treatment layer 26 is composed of the two resins described above, the surface of the cellulose acetate propionate resin is balanced by the lubrication layer role and adhesion of the polyvinylpyrrolidone resin and the release property due to excellent dry film formation ability. Since it is not sticky, the workability is excellent, and when the release film 25 is peeled off, the bending of the support film 22 does not occur, thereby achieving an effect of excellent appearance.

In order to maximize the effect of the present invention, it is important to form the surface treatment layer 26 as a continuous thin film. In the present invention, the surface treatment layer constituent resin in the release film 25 is dissolved in water, alcohol or an organic solvent, and then dried to apply a thickness of 0.1 to 5 μm, more preferably 0.3 to 3 μm, and then the pressure-sensitive adhesive layer 24 is designed. The solar control film 20 is manufactured by laminating with the metal deposition plastic support film 22. If the coating thickness of the surface treatment layer 26 after drying is less than 0.1㎛ continuous film formation is difficult due to the lack of releasability, there is a problem in the surface stickiness, if it exceeds 5㎛ there is a problem in adhesion.

In addition to the surface treatment layer 26, which is the main component of the present invention described above, the protective layer 21, the plastic support film 22, the optional metal deposition layer 23, and the reduced pressure constituting the solar control film of the present invention. The adhesive layer 24 will be described.

The protective layer 21 imparts abrasion resistance to the support film 22 and is preferably formed of a rigid film having a coating thickness of 0.1 to 5 µm. The protective layer composition is composed of a photocurable oligomer, a photoinitiator, a diluent, and the like, and is coated and pre-dried on the support film 22, followed by photocuring with ultraviolet light, thereby obtaining a hard film that can not be subjected to surface scratches. Among the composition components of the protective layer, urethane acrylate, urethane methacrylate, epoxy acrylate, epoxy novolac acrylate, polyester acrylate, polybutadiene diacrylate and the like are suitable, and as photoinitiator, benzyldimethyl Ketal, benzoin butyl ether, trimethyl benzophenone, alpha hydroxy ketone, ethyl 4- (dimethylamino) benzoate, benzophenone, hydroxylalkyl acetophenone, etc. are suitable.

As the plastic support film 22, a transparent or dyed film having a thickness of 10 to 100 µm is suitable as a polyethylene terephthalate biaxially stretched film. However, in the case of the transparent film it should be colored in the pressure-sensitive adhesive layer to be able to control the sunlight.

The metal deposition layer 23 is a method of coating a metal thin film by vapor deposition in order to take advantage of the reflective properties of the metal, the method is well known in the art. In terms of economics, it is preferable to deposit 99.99% of pure aluminum in a high vacuum atmosphere of 2 × 10 ^-5 torr in a high vacuum atmosphere to reflect the heat rays while controlling the visible light transmittance. Of course, it is not limited to this. It is also desirable to apply such a metal deposition layer to the present film, but it is an optional element that may not be applied as required by the manufacturer. That is, even when the metal deposition layer is omitted and the dye is colored on the pressure-sensitive adhesive layer for the control of the sunlight, the lubrication action and the adhesive force effect by the surface treatment layer appear. In this case, although it is irrelevant to the kind of dye, it is preferable to use 5 weight part or less with respect to the pressure-sensitive adhesive layer composition for the adhesive force of a pressure-sensitive adhesive layer.

The composition of the pressure-sensitive adhesive layer 24 is well known in the art, and is typically composed of an acrylic resin, a curing agent, a ultraviolet absorber, a dye, a stickiness control agent, and a solvent. Among the components of the pressure-sensitive adhesive layer, the acrylic resin is methyl methacrylate, ethyl methacrylate, isobuty methacrylate, normal buty methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, itaconic acid, hydroxyethyl Elate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate, 2-ethylhexyl acrylate polymer or copolymer, terpolymer, etc. are suitable. The curing agent serves to improve the water resistance of the pressure-sensitive adhesive layer, and melamine formaldehyde, urea formaldehyde, polyisocyanate, polyaziridine, zirconium complex, epoxy, zinc oxide, magnesium oxide, and the like are preferable. The ultraviolet absorber acts to prevent fading by blocking ultraviolet rays in the 300 nm to 400 nm region, and 2-hydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2 -Hydroxy-4-methoxy-2'-carboxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenonetrihydrate, 2-hydroxy-4-normaloctobenzobenzophenone, 2- Hydroxy-5-t-octylphenylbenzotriazole and the like are preferable, and commercially available examples thereof include CYASORB UV9 and UV24, manufactured by CYANAMID. UV207, UV284, UV531, UV1084, UV2300 and UV5411, CHIMASSORB 81 and 90, TINUVIN P 328, 900, 292, 622, 765, 770 and 114 from CIBA-GEIFY Etc. An acrylic resin, a vinyl resin, etc. are suitable as a stickiness control agent, A homopolymer or copolymer of methyl methacrylate and isobuty methacrylate is preferable as this acrylic resin.

Among the components of the pressure-sensitive adhesive layer 24, the acrylic resin, the curing agent, the ultraviolet absorber, and the stickiness controlling agent are 5 parts by weight of the curing agent, 1 part by weight of the ultraviolet absorber, and 5 to 50 parts by weight of the sticking regulator with respect to 100 parts by weight of the acrylic resin. It is preferable to mix | blend, In addition, what is necessary is just to mix | blend dye and a solvent in appropriate quantity. The pressure-sensitive adhesive blended in this way is usually prepared by coating and drying the plastic paper film.

Hereinafter, the preferred embodiment of the present invention will be described in more detail. However, the following examples are provided only for better understanding of the present invention, and the present invention is not limited to these examples.

EXAMPLES 1-4

The surface treatment layer coating composition of the composition shown in Table 1 was applied to a biaxially stretched polyethylene terephthalate release film (Kolon Astroll) having a thickness of 23 μm using a gravure coater and dried for 10 seconds in a 100 ° C. hot air oven to have a thickness of 2 μm. (Step A).

A biaxially stretched polyethylene terephthalate support film (Kolon Astroll) having a thickness of 23 μm was coated on the surface of the protective layer coating composition shown in Table 1 below, followed by drying in a hot oven at 80 ° C. for 10 seconds, followed by ultraviolet curing of the US Fusion Company. After treatment with the device (Model DR 120 + F455-20) with an irradiation distance of 5 cm and a feed rate of 5 m / min, the surface of the supporting film coated with a protective layer was 50Å with purity 99.99% aluminum at high vacuum of 5 × 10 ^-6 torr. Vacuum deposition to a thickness to form a metal deposition layer thereon was applied and dried to a pressure-sensitive adhesive layer coating composition shown in Table 1 to a thickness of 10㎛ (step B).

Next, the solar control film was prepared by laminating each other on the pressure-sensitive adhesive layer surface of the product of step (B) and the surface treatment layer of the product of step (A) and aging at 50 ° C. for 3 days.

Example 5

The same procedure as in Examples 1 to 4 was repeated except that the vacuum deposition process was omitted and the composition shown in Table 1 was used to prepare a solar control film.

[Comparative Examples 1-3]

The same procedure as in Examples 1 to 4 was repeated except that the composition shown in Table 1 was used to prepare a solar control film.

[Comparative Example 4]

The same procedure as in Examples 1 to 4 was repeated except that the surface treatment layer was omitted and the composition shown in Table 1 was used to prepare a solar control film.

TABLE 1

TABLE 1a

* Note 1) Cellulose acetate propionate resin manufactured by Eastman Kodak

2) Polyvinylpyrrolidone resin made by GAF Corporation

3) 2-ethylhexyl acrylate.methyl methacrylate / acrylic acid terpolymer

4) UV absorber made by Shiba GI Corporation

5) Vinyl chloride / vinyl acetate copolymer made by UNION CHRBIDE

6) Polymethyl methacrylate copolymer made by RoHM & HAAS

7) Oil-soluble dye made by Sandos

The solar control film manufactured based on the said Example 1-5 and Comparative Examples 1-4 was characterized by the following method. The evaluation results are shown in Table 2 below.

[Assessment Methods]

<Surface stickiness>

After peeling the release film out of the solar control film, two surface treatment layers were passed twice at a feed rate of 5 using a laminate made by “Korea Corporation”, and the adhesion between each other was measured by Instron as follows. It was.

◎: No stickiness (10g / inch or less)

○: no stickiness (adhesive force 10-30g / inch)

△: slightly sticky (adhesion 30-200g / inch)

×: much stickiness (more than adhesion strength 200g / inch)

<Peeling strength>

A 1-inch (about 2.54 cm), 15-cm long, solar-controlled film was measured while peeling the release film at 180 ° with a tensile speed of 50 nm / min on an Instron model 4201.

<Adhesive force>

After uniformly spraying water on the glass plate, the solar control film of 1 inch width and 15 cm in length from which the release film was removed was pressed and dried (see FIG. 3). It was measured under a condition of 50 mm / min of tensile speed in instron after 1 day standing.

<Visible light transmittance>

After the release film was peeled off with a total light transmittance measuring device (model name NDH-100DP, Nippon Color Corporation), visible light transmittance was measured.

<Ultraviolet ray blocking rate>

After the release film was peeled off, the blocking rate at 360 nm was measured using an ultraviolet-visible spectrophotometer (SHIMADZU company model name UV-260).

<Wear resistance>

Steel wool No. The protective film was rubbed 10 times with ####, and then the release film was peeled off to measure haze of the sample in an all-light measuring apparatus.

TABLE 2

TABLE 2a

Claims (4)

And a surface treatment layer, a pressure-sensitive adhesive layer, a plastic support film, and a protective layer which are sequentially laminated on the release film of the lowermost layer, wherein the surface treatment layer is a mixed resin of cellulose acetate propionate resin and polyvinylpyrrolidone resin Solar control film characterized in that the. The solar control film of claim 1, wherein the mixed resin has a weight ratio of cellulose acetate propionate: polyvinyl pyrrolidone = 1: 1 to 1: 5. The solar control film according to claim 1, wherein the thickness of the surface treatment layer after drying is 0.1 to 5 µm. The solar control film according to any one of claims 1 to 3, wherein the plastic support film has a metal deposition layer on a surface facing the pressure-sensitive adhesive layer.