KR20010084405A - Ultraviolet Control Film - Google Patents

Abstract

PURPOSE: Provided is an ultraviolet rays screening film formed by extrusion-molding resin granules impregnated with a spiropyran-based photosensitive compound pigment, which dose not be decolorized. CONSTITUTION: The ultraviolet rays screening film is produced by a process comprises the steps of: impregnating the spiropyran-based photosensitive compound (the following formula), dissolved in a mixture solvent of toluene/alcohol, into the resin granules at a temperature of 20-50deg.C for 0.05-48 hours; heating at a temperature of 160-300deg.C; and extrusion-molding. The resin granule is PE, PP, PET, PC, ABS, CA, or SAN.

Description

UV Protection Film {Ultraviolet Control Film}

The present invention relates to a method for producing a photochromic molding, and more particularly, to a method for producing a photochromic molding, wherein the photochromic compound pigment is absorbed into a resin and then molded.

UV blocking films that attach to glass, such as automobiles, buildings, exhibition halls, etc. to block sunlight and protect privacy from the outside, are disclosed in Korean Patent Laid-Open Publication Nos. 1999-026350 and 1999-026349. The light selective transmission layer which consists of an absorbent, a polymeric binder, or an acrylic adhesive is laminated | stacked on the plastic support film. In addition, Korean Patent Publication No. 1999-18538

In a solar control film produced by forming a release peeling layer (1), an adhesive layer (2), and a hard coating layer (4) on an es film (3), the adhesive layer (2) is largely absorbed in the near infrared region by the adhesive resin. A method of manufacturing a solar control film, which is formed by applying an adhesive containing a heat ray absorbent, which is an organic compound having a wavelength range, and forming the hard coating layer 4 using a mixture of a dye and an ultraviolet curing resin. Posted.

However, all of these products have a problem that the UV blocking layer is coated on the base film so that it is easily discolored and the process is complicated, such as to prepare and laminate the substrate layer and the coating layer separately.

In addition, in order to eliminate this disadvantage, the present inventors attempted to melt a resin granule together with a toluene / ethyl acetate / alcohol mixed solvent in Patent Application No. 1999-48421, but it is difficult to mold due to evaporation of the solvent during the melting process. Many.

Accordingly, it is an object of the present invention to provide a method for producing a photochromic resin molded article having no fear of discoloration by absorbing dye inside the resin.

Another object of the present invention is to provide a method for producing a photochromic resin molded article having no molding problem.

Figure 1 is an electron micrograph (400 times) of the surface of the resin granules infiltrated with the dye solution of the present invention.

Figure 2 is an electron micrograph (400 times) of the cross section cut the center of the resin granules infiltrated the dye solution of the present invention.

The object of the present invention is to penetrate the solution of the spiropyran-based photochromic compound in a toluene / alcohol mixed solvent in the resin granule at 0.05-50 hours, then heated to 160-300 ℃, forming Characterized in that.

The resin granules used in the present invention may use granules such as PE, PP, PC, PET, ABS, CA, or SAN resin.

Spiropyran-based photochromic compounds are known and about 0.1-1.0% by weight of the photochromic compounds are dissolved in a toluene / alcohol mixed solvent.

Preferably, a spiropyrane compound of the following formula is used.

In the case of forming the molded article of the present invention in the form of a film to produce a UV blocking film, a UV absorber may be used. Although there is no restriction | limiting in the kind of ultraviolet absorber, Tinubain (TINUVIN) etc. of Shivagaigi are used preferably. The ultraviolet absorbent is dissolved in an amount of about 1-3% by weight based on the total solution.

The alcohol mixing of the toluene / alcohol mixed solvent is in a volume ratio of 1: 1-2, preferably 1; It is made at the rate of 1.5. The alcohol solvent is at least one alcohol selected from the group consisting of methyl alcohol, ethyl alcohol, propyl alcohol, isopropyl alcohol, butyl alcohol, and isobutyl alcohol, and preferably used is an alcohol obtained by mixing isopropyl alcohol and butyl alcohol in the same ratio. do. Polyethylene, polypropylene, poly (ethylene terephthalate), polycarbonate, cellulose acetate resin, styrene / acrylonitrile copolymer resin or acrylonitrile in a solution in which a spiropyrane photochromic compound is dissolved in a toluene / alcohol mixed solvent The granule of / butadiene / styrene copolymer resin is immersed for 2 to 24 hours to allow the photochromic compound to penetrate. After the penetration of the compound, the granules are separated, the solvent is dried, heated to 160-300 ° C. and melted to form a variety of shapes such as films, fibers, and plates using a molding method used for general molding such as extrusion molding and calendering. It is good to shape.

When the dye solution is added together in the process of melting the resin, since the solvent is volatilized in the dye resin molding process, the molding of the resin was difficult, but in the present invention, such side effects are eliminated by directly infiltrating the photochromic compound and the ultraviolet absorbent into the resin. It became.

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

Example 1

2 g of a spiropyrane photochromic compound (manufactured by KROMA Corp., UK) and 10 g of TINUVIN-P (manufactured by Ciba-Geigy Co., Ltd.) were dissolved in a mixed solvent of 160 ml of toluene and 120 ml of isopropyl alcohol and 120 ml of butyl alcohol. 500 g of polyethylene (LLDPE) granule (SK Chemical Model FU149M) was immersed in the solution at 25-30 ° C. for 12 hours to absorb the solution.

The solvent was evaporated and dried and an electron micrograph of the surface was taken. The center of the granule was cut and its cross section was also taken with an electron microscope. The results are shown in FIGS. 1 and 2. It was confirmed that the dye was absorbed to the center of the gramul.

Granules were put in an extruder and mixed at 200 ° C. to produce a uniform mixture, and then extruded into a film shape. An acrylic pressure-sensitive adhesive was applied and laminated with a silicone release film to prepare a sunscreen film.

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 visible light transmittance and UV blocking rate (at 370 nm) using UV-VIS SPECTROPHOTOMETER. Was measured. UV blocking rate was 99%.

Dye Desorption Evaluation

After the prepared film was aged 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 checking the phenomenon of water removal during the construction of the glass window. The dye released was 0%.

As confirmed in the above embodiment, when the UV blocking film is manufactured by the method of the present invention, a phenomenon in which the UV absorber and the photochromic dye are absorbed in the resin and the dye is detached is completely removed, and the manufacturing process is simple and very economical.

Claims (3)

A solution comprising a spiropyran-based photochromic compound dissolved in a toluene / alcohol mixed solvent is infiltrated into the resin granules at 20-50 ° C. for 0.05-48 hours, and then heated to 160-300 ° C. to form a photochromic resin. Method of Making Molded Products. The method of claim 1, wherein the alcohol is a mixed solvent of isopropyl alcohol and butyl alcohol. The method of claim 1 wherein the resin granule is PE, PP, PET, PC, ABS, CA, SAN, or ABS resin granules.