KR20000021243A - Film for controlling sunbeams - Google Patents

Abstract

The present invention relates to a solar control film attached to a glass window for automobiles, buildings, and various exhibitions to control solar rays and to prevent the occurrence of a second accident due to fragments when the glass is destroyed by an accident. Scratch-resistant layer consisting of a chemical oligomer, a photoinitiator, a photocurable monomer and a diluent, a support film layer such as PET, a pressure-sensitive adhesive layer and a release film is a laminated structure in order to express the color by adding a dye to the scratch-resistant layer, Compared with the expression of the color in the support film, the coating non-uniformity or defects on the coating surface is reduced and the productivity can be dramatically improved by maintaining uniform physical properties at low cost.

Description

Solar control film

The present invention relates to a solar control film that can be attached to glass windows for automobiles, buildings, and various exhibitions to control solar rays and to prevent the occurrence of a second accident by fragments when the glass is destroyed by an accident.

In order to save energy in recent years, it is required to increase cooling and heating efficiency, to prevent scattering of glass fragments caused by natural disasters such as earthquakes and traffic accidents, or to prevent indoor furniture and decorations from fading by ultraviolet rays, and In order to secure a privacy space for individuals, we are trying to apply various solar control film.

In order to achieve this purpose and to satisfy the demands of the consumer, the color of the solar control film must be varied, and since it is directly visible to the naked eye, the surface of the film must be very clean.

In general, the solar control film is composed of a structure in which a scratch prevention layer, a plastic support layer, an adhesive layer, and a release film are sequentially stacked, and the color is expressed in the adhesive layer 3 as shown in FIGS. 1 and 2. It was realized by adding d) or dyeing by adding dye (d) to the PET support layer 12 which is a support film as shown in FIG.

First, when the dye (d) is put into the adhesive layer (3) as shown in Figure 1, since the resin constituting the adhesive layer 3 is generally a resin having elasticity itself, this is a conventional coating method gravure When applied by the method such as, lip, comma, etc., it is impossible to obtain a smooth coating surface, or when defects of the coating surface such as dent occur, the color is represented by dyes, so that the defects are emphasized more and more. Lowers.

In order to solve this drawback, rather than putting a dye in the adhesive layer to express the color, as shown in FIG. 2, a method of realizing color by coating the PET support layer 12 and coating a transparent adhesive has been known, but PET film If the dye is increased, the cost is increased, and if dyed, the physical properties of the PET film is poor, such as problems such as heat shrinkage during processing, there is a problem that the productivity is reduced.

An object of the present invention is to solve the problem in manufacturing a dye or put a plastic support film layer by putting a dye in the adhesive layer having elasticity to implement the color in the conventional solar control film as described above, It is to provide a solar control film that can easily improve the coating by putting a dye in the anti-scratch layer and have little coating defects during production, thereby significantly improving productivity.

1 is a cross-sectional view of the solar control film manufactured to implement the color in the conventional adhesive layer,

Figure 2 is a cross-sectional view of the solar control film manufactured to implement the color in the conventional support film layer,

Figure 3 is a cross-sectional view of the solar control film manufactured to implement the color in the scratch prevention layer according to the present invention.

* Description of the symbols for the main parts of the drawings *

1, 11, 111-anti-scratch layer 2, 12, 112-plastic support layer

3, 13, 113-Adhesive layer 4, 114-Release film layer

d-dye

The solar control film of the present invention for achieving the above object is a scratch prevention layer made of a photocurable oligomer, photoinitiator, photocurable monomer and diluent; Plastic support layer; Adhesive layer; And it is characterized in that the release film is configured to be sequentially laminated, to implement a color by adding a dye in the scratch prevention layer.

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

As shown in FIG. 3, the solar control film of the present invention has a structure in which a scratch prevention layer 111, a plastic support layer 112, an adhesive layer 113, and a release film 114 are sequentially stacked.

The scratch prevention layer 111 of the present invention is made of a conventional ultraviolet curable resin, and serves to impart wear resistance to the plastic support film 112.

In general, the thickness of the anti-scratch layer 111 is preferably 1.5 to 5㎛, and the total thickness may vary depending on the degree of color.

The material constituting the scratch prevention layer 111 is a photocurable oligomer, a photoinitiator, a photocurable monomer and a diluent, and is preliminarily dried by applying microgravure or mayer on the plastic support layer 112 and then surface-cured by ultraviolet curing. It is possible to obtain a hard film which does not occur.

As the photocurable oligomer, urethane acrylate, urethane methacrylate, epoxy acrylate, epoxy noblock acrylate, polyester acrylate, polybutadiene acrylate, and the like are suitable, and photoinitiators include benzyl dimethyl ketal and benzoin butyl ether. , Trimethylbenzophenone, α-hydroxyketone, benzophenone and the like are suitable.

When dye is added to such a compound to realize color, the material constituting the scratch prevention layer has minimal viscoelastic properties, so there is no problem of causing surface defects or coating unevenness when coating by a method such as microgravure or Meyer bar. The productivity of the light control film can be improved.

The dye that can be used for color expression of the solar control film is as long as it can be dissolved in an organic solvent, specifically, can be used a conventional dye emulsified after being complexed with chromium or cobalt. It is preferable that the usage-amount of dye normally is 0.02-3 weight part.

And cyclohexanone or methanol can be added as a solvent to a scratch prevention layer in order to improve the solubility of dye.

In addition, toluene etc. can be used as a diluent.

The plastic support 112 to which the scratch prevention layer 111 is applied is preferably a polyethylene terephthalate biaxially oriented film, and a transparent film having a thickness of 10 to 100 μm is preferable.

The composition constituting the adhesive layer 113 is an acrylic resin, a curing agent, an ultraviolet absorber, an anti-sticking agent, and a solvent. Specifically, as the acrylic resin, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, and normal Butyl methacrylate, normal butyl methyl methacrylate, 2-ethylhexyl acrylate, acrylic acid, methacrylic acid, itaconic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, acrylamide, methylol acrylamide, Polymers, copolymers or terpolymers of glycidyl methacrylate, ethyl acrylate and isobutyl acrylate are suitable.

As the curing agent, melamine formaldehyde, urea formaldehyde, polyisocyanate, polyaziridine, zirconium complex, epoxy, zinc oxide, magnesium oxide and the like are preferable.

UV absorbers act to prevent fading by blocking ultraviolet rays in the 300-400nm range, preferably 2-hydroxy-4-methoxybenzophenone, 2,2-dihydroxy-4-methoxybenzophenone , 2-hydroxy-4-methoxy-2'-carboxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone trihydrate, 2-hydroxy-4-normal octoxy benzophenone, and the like have.

As the stickiness control agent, acrylic resin, vinyl resin and the like are suitable.

Typically, the composition ratio of the adhesive layer 113 constituting the solar control film 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, 5 to 50 parts by weight of an anti-sticking agent, and a solvent. It is applied to the support layer 112, dried and completed.

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

Examples 1-2

A 25-μm thick biaxially oriented polyethylene terephthalate film (made by Kolon, ASTROLL) was prepared to have a scratch prevention layer of 3 μm in thickness with the composition shown in Table 1 below, and was applied to a release film and dried to prepare 10 μm of an adhesive layer. After the lamination with a film coated with a scratch prevention layer on a plastic support to prepare a solar control film of the present invention.

Comparative Example 1

Next, a solar control film was prepared with the composition as shown in Table 1, but was prepared by adding a dye to the pressure-sensitive adhesive layer as usual, rather than a scratch prevention layer.

Furtherance Example Comparative Example 1 One 2 Scratch prevention layer (parts by weight) Urethane methacrylate 50 50 50 Polyester acrylate 50 50 50 Benzyldimethyl ketal 3 3 3 Cyclohexanone 24 24 24 Methyl ethyl ketone 96 144 96 toluene 96 60 96 Isopropyl Alcohol 24 12 24 Adhesive layer (parts by weight) Acrylic Terpolymer ⁽¹⁾ 100 100 100 Polyisocyanate 5 5 5 Tinuvin 328 ⁽²⁾ One One One VAGH ⁽³⁾ 30 30 30 Acryloid B-44 ⁽⁴⁾ 3 3 3 Methyl ethyl ketone 20 20 20 Ethyl acetate 30 30 30 Dye (part by weight) Savinyl Brown ⁽⁵⁾ 0.2 0.2 0.2 Savinyl Black ⁽⁶⁾ 0.5 0.5 0.5 (1) 2-ethylhexyl acrylate / methyl methacrylate / acrylic acid terpolymer (2) Ciba-Geigy Co., Ltd. UV absorber (3) Union carbide vinyl chloride / vinyl acetate copolymer (4) Rohm & Haas poly Methyl methacrylate copolymer (5), (6) Sandos Corporation oil-soluble dye

Experimental Example 1

Coating defects, coating unevenness, cloudiness, dye solubility and dye paint stability of the solar control film prepared according to the above Examples and Comparative Examples were measured, and the results are shown in Table 2 below.

Here, the coating defect is the number of defects (dents) of 1 mm or more in diameter that can be distinguished by the naked eye by collecting three samples each having a width × length of 10 cm from the finished film in the width direction and the length direction. , Coating non-uniformity is the number of coating stripes (color difference generating part) which is visually determined per square meter by cutting 1m horizontally and vertically from the finished film.

In addition, the whitening phenomenon was cut out by 1m horizontally and vertically from the finished product of the solar control film, and the whitening phenomenon of the coating surface determined by the naked eye per m 2 was recorded and recorded.

The dye solubility is determined by dividing the dye in each composition containing the dye in the composition of the film, melted for 30 minutes with a mixer, and visually discriminating the state of dissolution by dividing it into 1 to 5 grades. It was set to 5.

Finally, the stability of the dye coating is to determine the stability by visually judging the phase separation phenomenon after dissolving the dye in each composition and dissolved in a mixer for 30 minutes and left for 12 hours.

Example 1 Example 2 Comparative Example 1 Coating defects (dents, pieces / ㎡) 1 or less 1 or less 7 Coating Stripe (Color Difference, Pieces / ㎡) None None 3 Cloudiness occurs None None None Dye solubility One One One Dye Paint Stability Good Good Good

From the results of Table 2, the solar control film prepared according to the embodiment has fewer coating defects, less streaks, haze and the like, as well as excellent solubility of dyes, as compared with conventional dyes added to the pressure-sensitive adhesive layer. It can be seen that the paint stability is good.

As described above in detail, according to the present invention, the solar control film, in which the dye is added to the anti-scratch layer according to the present invention, exhibits color, and thus the coating is easy because the anti-scratch layer composition is composed of a photocurable oligomer and a monomer. Compared with conventional dye layer resins by adding dyes, there is less coating non-uniformity, and compared to dyeing the support film, the cost is reduced, and the heat shrinkage of the film can be suppressed, thus improving productivity. .

Claims (1)

A scratch prevention layer composed of a photocurable oligomer, a photoinitiator, a photocurable monomer and a diluent; Plastic support layer; Adhesive layer; And in the solar control film composed of a release film is sequentially laminated, Sun control film, characterized in that to implement a color by adding a dye in the scratch prevention layer.