JPH0880594A - Manufacture of decorative film - Google Patents

Abstract

PURPOSE: To enable metallic feeling and luster to be increased by a method wherein a vinyl chloride made film in which aluminum powder is mixedly dispersed is extruded from a T-die by extrusion molding, and then stretched in warm water. CONSTITUTION: Polyvinyl chloride resin (hereinafter, referred to as PVC) made film in which aluminum powder is mixedly dispersed is extruded from a T-die 4 by extrusion molding. Then, the extruded PVC made film 8 is stretched in warm water in a warm water tank 6 within a range of 40 deg.C-90 deg.C. Its stretched magnification is made within a range of 2.0-2.5, and thereby orientation of aluminum powder in the film, i.e., an aluminum orientation angle is decreased. The PVC made film 8 is laminated on a base film under a hot state to be thermally fixed by pressure. A thermoplastic resin decorative film which is distinctly excellent in metallic feeling is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a decorative film which is used for automobile exteriors and the like and which has an excellent metallic feeling, and more particularly to a method for producing a decorative film which can give a metallic feeling equivalent to that of a conventional solvent type paint. Regarding

[0002]

2. Description of the Related Art In recent years, in order to prevent doors of adjacent cars from being damaged by contact when a door is opened or closed in a parking lot or the like, a number of malls having a side molding on a door outer plate and having both decoration and scratch prevention are increasing. . Vinyl chloride is generally used as a material for the side molding, and a black molded product obtained by kneading a black pigment in a vinyl chloride resin is used. For this reason,
From the viewpoint of the appearance of the entire automobile, it was necessary to apply paint of a desired color on the surface of the molding in order to match the color of the vehicle body.

However, when coating the surface of such a molding, the mold release agent adhering to the molded resin molding is removed by washing with solvent vapor, the primer is applied and dried, and the top coating material is further applied. Since it is necessary to paint and bake and dry it, the number of working steps is large, a high-level painting technique and a great number of working steps are required, and the paint itself is expensive. In addition, since solvent-based paints that have been widely used in the past volatilize the solvent, considerable equipment investment is required for the coating booth and the waste liquid treatment device.

Conventionally, as a decorative film 1 having a metallic color tone used for the exterior of an automobile, for example, there is one as shown in FIG. The material composition of this decorative film 1 is a mixture of a polyvinyl chloride resin with a color pigment 2 and aluminum powder 3.

[0005]

However, in the above-mentioned conventional metallic color tone decorative film, since the aluminum powder 3 is not oriented parallel to the plane direction of the film but is oriented randomly, a metallic feeling is obtained. There was a problem that it was scarce and inferior in decorativeness. For this reason, it has not reached the stage of being adopted as the exterior of the vehicle body, and it has been a problem to use a decorative film having an excellent metallic feeling for the exterior of the automobile.

Therefore, the present invention has been made in view of the above conventional problems, and it is extremely economical to provide a color matching a vehicle body color, especially a metallic color tone, which has been rapidly increasing in recent years, to exterior resin parts such as resin moldings. The method for producing a decorative film made of a thermoplastic resin that has a distinctly better metallic feel than the conventional colored coating film that covers exterior resin parts such as molded resin moldings The purpose is to do.

[0007]

The above objects of the present invention are as follows.
Vinyl chloride resin (hereinafter PV
C) film is extruded by a T-die by extrusion molding, and then the extruded PVC film is
It was achieved by a method for producing a decorative film, which comprises stretching in warm water in the range of 0 ° C., then laminating a base film on the PVC film in a hot state and thermocompression-bonding the base film.

[0008] The decorative film made of a thermoplastic resin has a predetermined color or pattern that matches the body of an automobile, and since it requires good adhesion to the body of the automobile, a known method (for example, plastics, Vol. 43. No7: A method for decorating a three-dimensionally molded product or a method appropriately selected from JP-A-3-150126) can be used for adhesion via an adhesive.

From the viewpoint of the appearance of the surface of the molding, the decorative film must have sufficient weather resistance. Examples of the coloring method of the decorative film include a method of blending a pigment into a conventionally used film base material and a method of printing on the film surface in advance, but a method of giving a metallic feeling equivalent to that of a solvent type paint. There was no. Further, as the resin film used in the present invention, as long as mechanical strength and impact resistance is sufficient, it can be appropriately selected from known resin films and used, It is also possible to apply a primer for improvement.

[0010]

The base material of the decorative film having the above characteristics is 0 to 50 parts by weight of a plasticizer, based on 10 parts by weight of PVC.
It preferably contains 10 to 35 parts by weight and an appropriate amount of an ultraviolet absorber and has a thickness of 20 to 500 μm, preferably 20 to 2
It is a 50 μm polyvinyl chloride film.

As the plasticizer to be added to PVC, esters such as dibutyl phthalate, dioctyl phthalate, dioctyl isophthalate, dioctyl sepagate and dioctyl adipate, epoxidized soybean oil and the like, polyester plasticizers and the like can be used. it can. This plasticizer is preferably added in the range of 10 to 35 parts by weight with respect to 100 parts by weight of PVC.

As the ultraviolet absorber blended in PVC, benzophenone derivative, phenyl salicylate, resorcinol ester, benzotriazole derivative can be used. This UV absorber is PVC100
In the range of 0.05 to 10 parts by weight, especially 0.
It is preferably added in the range of 5 to 5 parts by weight. Furthermore,
In the present invention, although not particularly required, a predetermined amount of a stabilizer such as lead chlorine, a metal soap type, an organic tin type or an organic stabilizer may be blended.

As the aluminum powder used in the manufacturing method of the present invention, the aluminum powder used in ordinary metallic paints can be used. In carrying out the production method of the present invention, aluminum powder is mixed in a kneading machine in a range of about 30 to 40% by weight with respect to PVC having a relatively small molecular weight, and the resulting mixture is used for film production. Mix with PVC with a kneading extruder, aluminum powder is 10 to 4 relative to PVC
It is blended so as to be in the range of 0% by weight and extruded from a T-die.
If the blending amount of aluminum powder is less than 10% by weight, the brightness of the decorative film is insufficient and the metallic feeling is poor, and conversely, if it exceeds 40% by weight, the strength during film stretching is insufficient and the film is cut.

Next, in the present invention, the PVC film extruded from the T die is stretched in warm water in the range of 40 to 90 ° C. The stretching temperature is set in the range of 40 to 90 ° C. because the temperature in this range is 10 ° C. or higher than the glass transition temperature (Tg point) of PVC and 10 ° C. or lower than the melting point of PVC. It depends. This means that the PVC can be stretched at a Tg point or higher, and the orientation of the aluminum powder needs to be 10 ° C. or higher than the Tg point. Further, when the PVC melting temperature is reached, the film is cut during stretching. Therefore, the melting temperature is 10
By lowering the temperature by ℃ or more, it means that the film can be stretched and the aluminum powder can be oriented at the same time.

PVC containing 10% by weight of a plasticizer
Then, the warm water at the time of stretching is in the range of 60 to 90 ° C, preferably 70 to 80 ° C. 20% by weight of plasticizer
With the added PVC, the warm water during stretching is in the range of 40 to 70 ° C, preferably 50 to 60 ° C. This is the same as the reason described above.

Further, the stretching of the vinyl chloride resin film in warm water is preferably carried out at a stretching ratio of 2.0 to 2.5 times. By adjusting the stretching ratio within the range, it is most suitable for reducing the orientation of the aluminum powder in the film, that is, the aluminum orientation angle (θ). If the draw ratio is less than 2 times, the orientation and gloss of the aluminum powder will be insufficient and the metallic feel will be poor, and if it exceeds 2.5 times, the smoothness of the film will be lost and the orientation and gloss of the aluminum powder will be poor. Not only becomes insufficient and the metallic feeling becomes poor, but also the film is cut. In the present invention, by using a film having a draw ratio of 2.5 times, the orientation of the aluminum powder becomes the most parallel to the plane direction of the film, and a high-gloss film excellent in metallic feeling can be obtained.

[0017]

EXAMPLES The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.

Example 1 FIG. 1 shows a process drawing of the method for producing a decorative film of the present invention. 30% of aluminum powder was added in advance and mixed with a kneader in a master batch of polyvinyl chloride (without plasticizer), and polyvinyl chloride with 10% of dioctyl phthalate as a plasticizer (glass transition temperature of 50 ° C. And a melting temperature of 100 ° C.) were mixed by a kneading extruder. Then T
The sheet is extruded from the die 4 into a sheet shape, the sheet is wound around the cooling roll 5, the temperature of the hot water tank 6, that is, the stretching temperature is set to 60 ° C., and the stretching ratio is 2. depending on the speed difference between the front and rear rolls 7 in warm water. The sheet was stretched 5 times to obtain a film 8 having a film thickness of 150 μm in which 20% of aluminum powder was dispersed and oriented in polyvinyl chloride, and the film 8 was wound on a winding roll 9.

The resulting film was preliminarily laminated with a heat-fusion-type film adhesive prepared by a calendar or the like, on a base film having a thickness of 150 μm, in the range of 80 to 100 ° C. so as to have a melting point of PVC or higher. It was laminated and thermocompression bonded. After that, the stretched oriented polymer of PVC was cooled with water so as to be slightly relaxed to obtain the film of Example 1.

Example 2 A film of Example 2 was obtained in the same manner as in Example 1 except that the stretching temperature was set to 70 ° C.

Example 3 A film of Example 3 was obtained in the same manner as in Example 1 except that the stretching temperature was set to 80 ° C.

Example 4 A film of Example 4 was obtained in the same manner as in Example 1 except that the stretching temperature was set to 90 ° C.

Comparative Example 1 A film of Comparative Example 1 was obtained in exactly the same manner as in Example 1 except that stretching was not carried out.

Example 5 A film of Example 5 was obtained in exactly the same manner as in Example 1 except that 20% of dioctyl phthalate was added as a plasticizer and the stretching temperature was set to 40 ° C.

Example 6 A film of Example 6 was obtained in exactly the same manner as in Example 1 except that 20% of dioctyl phthalate was added as a plasticizer and the stretching temperature was set to 50 ° C.

Example 7 A film of Example 7 was obtained in exactly the same manner as in Example 1 except that 20% of dioctyl phthalate was added as a plasticizer and the stretching temperature was set to 60 ° C.

Example 8 A film of Example 8 was obtained in the same manner as in Example 1 except that 20% of dioctyl phthalate was added as a plasticizer and the stretching temperature was set to 70 ° C.

Example 9 A film of Example 9 was obtained in exactly the same manner as in Example 1 except that the stretching temperature was set to 75 ° C and the stretching ratio was 1.5 times.

Example 10 A film of Example 10 was obtained in the same manner as in Example 1 except that the stretching temperature was set to 75 ° C and the stretching ratio was 2.0 times.

Example 11 A film of Example 11 was obtained in exactly the same manner as in Example 1 except that the stretching temperature was set to 75 ° C. and the stretching ratio was 2.5 times.

Comparative Example 2 A film of Comparative Example 2 was obtained in exactly the same manner as in Example 1 except that the stretching temperature was set to 75 ° C. and the stretching ratio was set to 3.

Example 12 The aluminum powder in the film was 10%, and the stretching temperature was 75.
Example 1 was carried out in the same manner as in Example 1 except that the temperature was set to 0 ° C.
A film of 2 was obtained.

Example 13 A film of Example 13 was obtained in the same manner as in Example 1 except that the stretching temperature was set to 75 ° C.

Example 14 The aluminum powder in the film was 30%, and the stretching temperature was 75.
Example 1 was carried out in the same manner as in Example 1 except that the temperature was set to 0 ° C.
A film of 4 was obtained.

Example 15 The aluminum powder in the film was 40%, and the stretching temperature was 75.
Example 1 was carried out in the same manner as in Example 1 except that the temperature was set to 0 ° C.
A film of 5 was obtained.

Comparative Example 3 The aluminum powder in the film was 5% and the stretching temperature was 75 ° C.
A film of Comparative Example 3 was obtained in exactly the same manner as in Example 1 except that the setting was made.

Comparative Example 4 The aluminum powder in the film was 50%, and the stretching temperature was 75.
Comparative Example 4 was performed in exactly the same manner as in Example 1 except that the temperature was set to ° C.
I got a film of.

Test Evaluation On the films obtained in each of the above Examples and Comparative Examples, a colored PVC film having a thickness of 100 μm prepared in advance by calendering or extrusion molding was hot laminated and thermocompression bonded.
Then, an acrylic transparent film having a film thickness of 100 μm, which was prepared in advance by calendering or extrusion molding, was hot laminated on this film and thermocompression-bonded to obtain a highly oriented aluminum decorative film shown in FIG. The following test evaluation was implemented using this decorative film.

(1) Measurement of Aluminum Orientation Angle To measure the aluminum orientation angle, an enlarged photograph of a cross section of the film was taken with a microscope and the angle (θ) shown in FIGS. 1 and 6 was measured.

(2) Gloss measurement It was determined by measuring the regular reflectance at 60 degrees with a gloss meter.

(3) Metallic feeling The condition of the aluminum powder contained in the film was visually observed. ◎: Very good metallic feeling ○: Good metallic feeling △: Slightly good metallic feeling ×: Poor metallic feeling

Regarding the obtained test evaluation results, Example 1
4 to Comparative Example 1 and Table 1 for Comparative Examples 1, Table 2 for Examples 5 to 8, Table 3 for Examples 9 to 11 and Comparative Example 2, and Table 4 for Examples 12 to 15 and Comparative Examples 3 to 4.
Shown in

[0043]

[Table 1]

[0044]

[Table 2]

[0045]

[Table 3]

[0046]

[Table 4]

FIG. 3 shows the relationship between the orientation angle of aluminum powder in the film and the stretching temperature. The PVC (containing 10% of the plasticizer dioctyl phthalate) used in Table 1 has a glass transition temperature of 5
The melting temperature is 0 ° C and the melting temperature is 100 ° C. The temperature of the hot water tank, that is, the stretching temperature of the sheet is small in the range of 60 to 90 ° C., the aluminum orientation angle is in the range of 4.7 to 9.8 degrees, and the gloss is 81.2 to 8.
The result was a high range of 5.8%. Further, the temperature range was 70 to 80 ° C., the aluminum orientation angle was particularly small in the range of 4.7 to 4.9 degrees, and the gloss was particularly good in the range of 85.5 to 85.8%.

The PVC used in Table 2 (containing 20% of the plasticizer dioctyl phthalate) had a glass transition temperature of 30.
C., melting temperature 80.degree. Those containing 20% of aluminum powder have a small aluminum orientation angle of 4.6 to 9.7 degrees in a stretching temperature range of 40 to 70 ° C. and a gloss of 81.5.
It was particularly good in the range of ˜86.8%. Further, in the temperature range of 50 to 60 ° C., the aluminum orientation angle was 4.6 to 4.8 degrees, which was particularly small, and the gloss was 85.6 to 86.8%, which was particularly good.

FIG. 4 shows the relationship between the orientation angle of aluminum powder in the film and the draw ratio. The PVC used in Table 3 contains 10% of the plasticizer used in Example 1. Aluminum orientation angle is 4.8-in the draw ratio of 2-2.5 times.
It was in the range of 9.7 degrees, the gloss was good in the range of 81.4 to 85.6%, and the metallic feeling was also good. In Comparative Example 2, the draw ratio was set to 3 times, and the film was partially cut to produce a film, which was not practical.

FIG. 5 shows the relationship between the coating gloss of the film and the content of aluminum powder in the film. In addition, Table 4 shows the results of carrying out aluminum powders containing 10%, 20%, 30% and 40% as an example. As shown in Table 4, the film having the aluminum powder in the range of 20 to 30% had particularly good gloss in the range of 82.4 to 85.6%. On the other hand, the film containing 5% aluminum powder, which was carried out as a comparative example, was inferior in gloss to 71.8%, and the film containing 50% aluminum powder was partially cut by stretching and produced. The resulting film was not practical.

[0051]

As described above, according to the method for producing a decorative film of the present invention, its constitution is made of aluminum powder and PV.
A film made of vinyl chloride mixed and dispersed in an amount of 10 to 40% by weight with respect to C is extruded by a T die by extrusion molding, and then the extruded film made of PVC has a draw ratio of 2 to 2 in warm water in the range of 40 to 90 ° C. Stretched 2.5 times, then PV
Since the base film is hot laminated on the C film and thermocompression bonded, the orientation angle of the aluminum powder contained in the film can be made small, and the metallic feeling and gloss are increased to improve the decorativeness. An excellent film can be obtained. Therefore, the decorative film obtained by the manufacturing method of the present invention can be applied not only to automobile moldings, but also to exterior resin parts such as resin bumpers, mirror housings, and wheel caps.

[Brief description of drawings]

FIG. 1 is an enlarged view showing a cross-sectional structure of a decorative film obtained by a production method of the present invention and an orientation angle of aluminum powder.

FIG. 2 is a process drawing showing the method for producing a decorative film of the present invention.

FIG. 3 is a diagram showing a relationship between a stretching temperature and an orientation angle of aluminum powder in a decorative film.

FIG. 4 is a diagram showing a relationship between a draw ratio and an orientation angle of aluminum powder in a decorative film.

FIG. 5 is a diagram showing the gloss of the film and the content rate of aluminum powder in the decorative film.

FIG. 6 is an enlarged view showing a cross-sectional structure of a conventional decorative film and an orientation angle of aluminum powder.

[Explanation of symbols]

 1 Conventional Decorative Film 2 Pigment 3 Aluminum Powder 4 T Die 5 Cooling Roll 6 Hot Water Tank 7 Roll 8 Film 9 Winding Roll 10 PVC Base Film 11 Aluminum Oriented PVC Film 12 Transparent Colored Film 13 Transparent Film

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B32B 31/12 9349-4F 31/20 9349-4F 31/30 9349-4F C08K 3/08 C08L 27 / 06 KGF // B29K 27:06 B29L 7:00 9:00

Claims (3)

[Claims] 1. A vinyl chloride resin film in which aluminum powder is mixed and dispersed is extruded by a T-die by extrusion molding, and then the extruded vinyl chloride resin film is 40 to 9 pieces.
A method for producing a decorative film, which comprises stretching in warm water in the range of 0 ° C., then laminating a base film on the vinyl chloride resin film in a hot state and thermocompression-bonding the base film. 2. The method for producing a decorative film according to claim 1, wherein the stretching of the vinyl chloride resin film in warm water is performed at a draw ratio of 2.0 to 2.5. 3. An aluminum powder mixed and dispersed in a vinyl chloride resin film is 10 to 40% by weight based on vinyl chloride.
The method for producing a decorative film according to claim 1, wherein the method is in the range of.