KR19990018537A - Manufacturing Method of Solar Control Film - Google Patents

Abstract

The present invention is a solar control film (SOLAR CONTROL FILM) that attaches to a glass of a car, a building, an exhibition hall, etc. and has a function of blocking sunlight and protecting privacy from the outside and preventing safety accidents in case of window breakage caused by external pressure. The present invention relates to a method of manufacturing, in particular, to prevent frost on window glass or the like.

The present invention specifically forms a release layer, a pressure-sensitive adhesive layer and an anti-fog layer on the support film, when manufacturing a solar control film, using a method of applying a hydrophilic polymer or a water-repellent polymer material to the support film as an anti-fog layer forming method The present invention relates to a method of manufacturing a solar control film, wherein the manufactured solar control film exhibits particularly excellent performance of antifogging property, which is an anti-fog function, with little effect on existing general physical properties.

Description

Manufacturing Method of Solar Control Film

The present invention is attached to the glass window surface of the car, building, exhibition hall, etc. to block sunlight

The present invention relates to a glass film having a function of protecting privacy from the outside and preventing safety accidents when a glass window is damaged by external pressure. In particular, a solar control film made of polyethylene terephthalate (PET) material In addition to silver blocking, it is also used for safety reinforcement due to the strong physical properties of PET film as an additive effect.

In general, the solar control film reduces the total solar energy transmittance by the sun blocking effect to increase the cooling and heating efficiency, prevents skin aging and anti-glare by the UV blocking effect, and prevents accidents or strong impacts. It can prevent the second accident caused by the glass scattering due to, and has the function to beautify the appearance of cars and buildings by the appearance of a variety of colors by the coloration function.

In manufacturing a solar control film having such a function, the most important factor is the selection of a dye that absorbs visible light in a specific wavelength range to express color, the selection of an ultraviolet absorber, and the compatibility of these and resins.

The method of manufacturing a product by using a conventional dyed PET film to express color or milling an insoluble pigment and separating it from the adhesive layer is more expensive to produce and more complicated than a method of mixing dyes with resin and coating. The disadvantage is that.

In addition, when the conventional solar control film is attached to a glass window, dew condensation occurs due to dew condensation according to a temperature difference between indoors and outside, and thus, the outside is not visible.

The present invention has been made to solve the above problems, by coating an anti-fog agent on the support film to prevent the watch from blurring, especially by using the window glass or rearview mirror of a car or the window glass of a building to prevent the clock from clouding. The purpose is to provide a solar control film that can be done.

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

* Explanation of symbols for main parts of the drawings

1: release layer

2: adhesive layer

3: support film

4: antifog layer

The present invention relates to a method for manufacturing a solar control film manufactured by forming a release peeling layer (1), an adhesive layer (2) and an anti-fog layer (4) on the support film (3) as shown in FIG. Hereinafter, the present invention will be described in detail.

In the present invention, the support film 3 is not particularly limited as long as it has toughness, but a polyester film (particularly a PET film) having transparency, dimensional stability, and excellent mechanical strength is preferable. At this time, the thickness of the film is determined in consideration of the kind, strength, and the like of the film to be used, but usually in the range of 10 to 50 µm.

In addition, the release release layer 1 is formed by stacking a silicone release film coated with silicon on a film cross section to protect the adhesive layer from foreign matters, and the thickness thereof is not necessarily limited, but is in the range of approximately 25 to 30 μm. It is preferable.

The method of forming the anti-fog layer 4 on the supporting film, which is a feature of the present invention, is a method of applying a hydrophilic polymer material such as polyethylene glycol or a water-repellent polymer material such as silicon, and a hydrophilic material or water-repellent material is dispersed in a polymer binder. A method of applying and forming a film may optionally be used. Among these, especially hydrophilic acrylic resin shows the best performance. At this time, the coating thickness after drying is suitable, 5 ~ 15㎛, if the coating thickness is too thin, the anti-fog property is poor, if too thick, the product itself is stiff and may cause cracks in the coating layer.

As an adhesive used for the adhesion layer 2 for sticking to a window glass surface, it can select from acrylic resins, such as a polymethyl methacrylate or a methacrylic acid ester copolymer, urethane type, an epoxy type, and vinyl type resin, Among them, acrylic type having excellent weather resistance and water resistance and excellent compatibility with dyes and ultraviolet absorbers is particularly preferred.

The dye is diluted in a certain amount of solvent for widening the working area with the resin and for the convenience of coating, and therefore, a solvent-soluble dye must be selected. Particularly, a 1: 2 metal complex dye having excellent daylight fastness is preferable. The dilution of the dye is controlled according to the solvent, but in most cases, it is appropriate to be between 5 and 15 times the dye used. If the dilution is less than 5 times, the working area with the resin becomes small, so that sufficient compounding is not achieved. If the dilution exceeds 15 times, the solvent is not dried enough during the manufacturing process, causing the surface to be coated. . The addition ratio of the dye is somewhat fluid depending on the target color and the target transmittance, but is usually about 0.5 to 5%. If the amount of dye added is too small, the effect of light blocking is reduced, and the anti-glare effect, which is one of the main functions of the solar control film, is reduced. If the amount is added too much, light transmission is not achieved, resulting in an opaque product.

On the other hand, since the solar control film is a functional film attached to a glass window, it is exposed to ultraviolet rays in the wavelength range of 280 to 380 nm for a long time, so that the resin is prevented from deterioration of the resin, human skin aging inside the window, and discoloration of furniture. Add absorbent. However, since the polyester film does not transmit an ultraviolet region of 310 nm or less on its own structure, a benzotriazole type having excellent ability to absorb ultraviolet rays in a wavelength region of 310 nm or more is particularly preferable as the ultraviolet absorber. In most cases, the amount of UV absorber added is about 1 to 5% by weight based on the total weight of the resin. If the amount is too small, the UV absorbing power is decreased. There is a problem with the coated surface.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

(Example 1)

Apply 35 g / m2 of acrylic resin to one side of the transparent polyester film (Saehan: XG-200, 25μ) using a Meyer coating bar, and then dry at 70 ° C for 5 minutes to make the dry thickness 7.0㎛. Form a layer. The polyester film having the anti-fog layer formed thereon was applied to the opposite surface of the anti-fog layer with a coating liquid having the following composition, and then dried at 100 ° C. for 1 minute so that the adhesive layer had a thickness of 15 μm. Lamination produced a solar control film with an anti-fog layer.

Composition of Coating Liquid

Acrylic resin (BPS 4089-5, Samyoung Ink): 100.0g

-Isocyanate curing agent (Brand name: BPS 4089B, Samyoung Ink): 0.687g

-Dye (trade name: AIZEN METHYLENE BLACK, Hodogaya Corporation): 2.0g

-UV absorber (trade name: TINUVIN 579, Shiba Gaigisa Co., Ltd.): 1.0g

Methyl ethyl ketone: 15.0 g

(Example 2)

The anti-fog layer was coated with 50 g / m 2 using the same acrylic resin as in Example 1, dried at 70 ° C. for 5 minutes, and formed in the same manner as in Example 1 except that the anti-fog layer was formed to have a dry thickness of 7.0 μm. A control film was prepared.

(Comparative Example 1)

A solar control film was manufactured in the same manner as in Example 1 except that the anti-fog layer was not formed.

The physical properties of the solar control film prepared in the Examples and Comparative Examples were evaluated by the following method, the results are shown in Table 1 and Table 2.

Anti-fog

After aging the prepared film for 7 days at room temperature, the release film is peeled off and adhered to a glass (3mm thickness) prepared in advance, and then placed on the beaker with the anti-fog coating face down on the beaker containing water. After the beaker was installed in a constant temperature and humidity bath at 25 ° C. and 60%, the temperature of the beaker's water was raised to 40 ° C., and the film became cloudy over time.

Adhesion

After aging the prepared film for 7 days at room temperature, the release film was peeled off and then bonded to a glass (3mm thickness) prepared in advance so as to have a width of 25mm and a length of 25cm, and then reciprocally crimped twice with a 2kg roller to prepare a sample. After storing this at room temperature for 24 hours, 180 ° PEEL strength was measured using a tensile strength tester.

Visible light transmittance and UV blocking rate

After aging the prepared film at room temperature for 7 days, the release film was peeled off and the sample was prepared to have a width of 3 cm and a length of 4.5 cm, and then the visible light transmittance and the UV blocking rate (at 370 nm) were measured using UV-VIS SPECTROPHOTOMETER. It was.

Dye precipitation evaluation (dye durability evaluation)

After aging the prepared film at room temperature for 7 days, the release film was peeled off, and the sample was prepared to have a width of 30 cm and a length of 50 cm, and then measured by confirming a phenomenon appearing when removing water during the construction of the glass window.

Anti-fog 1 minute elapsed 2 minutes 3 minutes elapsed 4 minutes 5 minutes 10 minutes Example 1 O O O O O O Example 2 O O O O O O Comparative Example 3 X X X X X X O: Not cloudy, X: Not cloudy

Visible light transmittance UV protection rate Adhesion Dye precipitation Example 1 28% 64% 578 gf Good Example 2 29% 65% 578 gf Good Comparative Example 3 28% 64% 578 gf Good

As can be seen from the above examples and comparative examples, when manufacturing the solar control film according to the present invention, compared to the existing products, the anti-fog anti-fog function does not affect general properties such as light transmittance, UV blocking rate, adhesion, or dye deposition. A useful effect can be obtained in which the anti-fog property exhibits particularly good performance.

Claims (6)

When forming the release control layer (1), the adhesive layer (2) and the anti-fog layer (4) on the support film (3) to produce a solar control film, a method of forming an anti-fog layer (4) hydrophilic polymer or water-repellent polymer A method of manufacturing a solar control film, characterized in that the material is applied to a support film or a hydrophilic material or a water-repellent material is dispersed and applied to a polymeric binder to form it. The method of claim 1, wherein the supporting film is a polyester film. The method of claim 1, wherein the release release layer is a silicon release film coated with silicon. The method of claim 1, wherein the pressure-sensitive adhesive layer is formed by using a pressure-sensitive adhesive in which a dye and an ultraviolet absorber are mixed with a pressure-sensitive adhesive resin selected from acrylic, urethane, epoxy, or vinyl resins. The method of claim 1, wherein the hydrophilic polymer material is an acrylic resin. 5. The method of claim 4, wherein the dye is a solvent-soluble soluble 1: 2 metal complex dye having excellent light resistance.