JPH0729399B2 - Film for film protection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a so-called composite material for protecting a coating film formed on various substrates such as metal or plastic which is novel and useful. Regarding film. More specifically, the invention does not contain any colorant component,
A particular colored film containing a colorant component and an adhesive layer are separately laminated on the front and back surfaces of this resin film through a specific resin film, thereby providing a particularly excellent appearance. In addition, the present invention relates to a film for protecting a coating film which is excellent in durability and the like, and in particular, which prevents the external coating film of a vehicle from being damaged by an impact such as pebbles or rock salt that collides during traveling.

[Conventional technology]

When a vehicle is traveling, collisions such as pebbles and rock salt, that is, rock salt is sprayed on roads in winter to prevent freezing in cold regions, but in that case impact of collision of a large amount of rock salt sprayed , Or not only in cold regions,
Alternatively, regardless of the season, the coating film on the outside of the vehicle that is damaged by the impact of a collision such as a small stone is damaged, and rust is generated from the damaged part, that is, rust due to chipping is a serious problem.

Therefore, in the industry, various attempts have conventionally been made to solve these problems. For example, a soft high-thickness paint as an undercoat paint is applied to a portion where pebbles or stone fragments scattered by the traveling of a vehicle hit. Although there is a method of coating, it has already been put to practical use, but as long as it is such a method, there is a limitation in film thickness and material from the viewpoint of coating workability, and that purpose cannot be achieved sufficiently. However, the vinyl chloride-based resin originally has a weather resistance, although a method of coating a vinyl chloride-based sol instead of the above-mentioned coating method of the soft high-film thickness type undercoating paint is adopted. It is bad, and due to migration of plasticizers, stabilizers, and additives contained in the resin to the surface of the coating film for a long period of time, it causes a remarkable discoloration, a decrease in gloss, and clatter, resulting in a beautiful appearance. Drop There has been a drawback that also Shorai.

Furthermore, as another method, a method of sticking a film for protecting a coating film is also used. As a conventional protective film, as shown in FIG. 1, a urethane resin or a vinyl chloride resin is used. A protective film 6 in which a soft resin film 2 is coated with an adhesive 3 is used.

[Problems to be solved by the invention]

However, although these resins have rubber elasticity in terms of material and sufficiently retain the protective function of the coating film, they may cause a significant discoloration or deterioration of gloss due to long-term outdoor use, resulting in a beautiful appearance. However, there was a problem that it was inconvenient.

[Means for solving problems]

However, the inventors of the present invention have eagerly studied in order to solve various problems in the conventional techniques as described above, and as a result, as a result, do not contain a colorant component at all, through a specific soft resin film. , Or a specific coloring film containing a colorant component and an adhesive layer are separately coated and laminated on the front and back surfaces of the soft resin film respectively, so that the appearance and durability can be improved. The present invention has now been completed by finding that a highly practical film-protecting film having excellent properties and the like can be easily obtained.

That is, the present invention basically comprises one side of the soft resin film (A) containing no colorant component,
While laminating a colored film (B) layer containing a colorant component, on the other side of the soft resin film (A),
In the film for protecting a coating film, which comprises providing an adhesive layer and further providing a release paper layer thereon, the resin for preparing the soft resin film (A) is a urethane resin or an ethylene-vinyl acetate copolymer, respectively. At least one resin selected from the group consisting of a polymer resin, a polyester resin, a polyamide resin, and a urethane-vinyl chloride copolymer resin is used, and as the resin for preparing the colored film (B), At least one resin selected from the group consisting of acrylic resin, ethylene-vinyl acetate copolymer resin, fluorine resin and polyester resin, which is excellent in appearance and durability, is used, and the colored film (B) layer is What is comprised from said resin which prepares this (B) layer, and a metal powder and / or a coloring pigment Therefore, it is used for protecting a coating film on an already-painted plate to be protected and used for protecting the coating film on the painted plate. Particularly, for highly-practical coating film protection having excellent appearance and durability. It is intended to provide a film.

Therefore, according to the present invention, a soft resin film (A) having an excellent protective function for a coating film, a colored film (B) having excellent appearance and durability, and an adhesive layer are laminated to form a composite. It can be summarized that the present invention relates to a film for film protection capable of simultaneously solving the problems of protection and appearance and durability of the film, which have been difficult in the past. The use of the film for the first time protects the coating film and imparts excellent appearance and durability.

FIG. 2 illustrates the structure of the coating film protecting film of the present invention having the above-described structure, and FIG.
While the colored film 1 containing the colorant component is applied and laminated on one side of the above, the adhesive layer 4 is formed on the remaining one side of the soft resin film 2 that does not contain any colorant component. By coating and laminating, and further by laminating the release paper layer 5 on the adhesive layer 4, the intended coating film protecting film 7 of the present invention is formed.

Here, the above-mentioned colored film (B) is a resin having a material excellent in appearance and durability, such as at least one selected from the group consisting of acrylic resin, fluorine resin, ethylene-vinyl acetate copolymer resin and polyester resin. It is composed of a resin and a known and commonly used metal powder and / or a coloring pigment. Typical examples of such metal powder include gold powder, silver powder, brass powder, aluminum powder and copper powder. On the other hand, typical color pigments include inorganic pigments such as titanium oxide and organic pigments such as cyanine or quinacridone.

Of course, in the present invention, when preparing the colored film (B), the various resins described above may be used alone or in combination of two or more kinds.

Further, the coloring film (B) may further contain various known and commonly used additive components such as an ultraviolet absorber, a radical scavenger or an antioxidant, if necessary, to further improve the durability. .

The colored film (B) is prepared by mixing a metal powder and / or a coloring pigment into a granular or powdery material of various resins as described above to form a film by a T-die method, an inflation method or a calendar method. Alternatively, the solution may be prepared by mixing a metal powder and / or a coloring pigment with a solution of various resins as described above and forming a film by a casting method.

The thickness of the colored film (B) thus obtained is preferably about 50 to 200 μm.

On the other hand, the above-mentioned soft resin film (A) is also one or two kinds of resins having excellent elasticity such as urethane resin, ethylene-vinyl acetate copolymer resin, polyester resin, polyamide resin or urethane-vinyl chloride copolymer resin. The above is a usual film forming method, for example, the T-die method,
It can be prepared by either an inflation method or a calendering method, or a method of casting one or more solutions of each of these resins by a casting method. it can.

The soft resin film (A) has a breaking strength of about 100 to 500 kg / cm ² and an elongation of 200 to 700%.
What is obtained by selecting and using a resin of about
The thickness of the resin film (A) is preferably about 50 to 400 μm.

Next, as a method for laminating the soft resin film (A) and the colored film (B), for example, there is a method in which the soft resin film (A) and the colored film (B) are pressed under heat and pressure-bonded. Then, there is also a method of applying an adhesive to the soft resin film (A) or the colored film (B) and adhering the colored film (B) or the soft resin film (A) thereon, or a composition for the soft resin film. There is also a method of coextruding the product and the composition for colored film.

Further, as the adhesive used for forming the above-mentioned adhesive layer, each resin such as polyester, urethane or acryl can be mentioned, and as the application method of the adhesive, a roller, a knife, a brush or a spray can be used. Although known methods can be used, a dry lamination method using a roller or a knife is particularly preferable.

Furthermore, as the release paper that can be laminated on the adhesive layer, those coated with various known release agents such as waxes, silicones, or bisamides such as bisamide stearate can be used.

The coating film protective film of the present invention thus obtained can be used as a composite film for protecting an existing coating film formed on a substrate such as various metals or various plastics.

〔Example〕

Next, the present invention will be specifically described with reference to Examples and Comparative Examples. In the following, all parts and% are based on weight unless otherwise specified.

Example 1 (1) Preparation example of soft resin film "Pantex T-5167" [thermoplastic urethane resin manufactured by Dainippon Ink and Chemicals, Inc.] was extruded by the T-die method to have a thickness of 300 µm and fractured. Strength is 400kg / c
m ^2, and the and elongation 500% becomes soft resin film (A-
1) was obtained.

(2) Preparation Example of Colored Film 70 parts of acrylic copolymer resin particles having a weight average molecular weight of 350,000 and containing methyl methacrylate and n-butyl acrylate at 70% and 30%, respectively,
A white film (B-1) having a thickness of 80 μm was obtained by mixing 30 parts of “Taipaque CR-90” (titanium oxide manufactured by Ishihara Sangyo Co., Ltd.) and performing extrusion molding using a T-die.

(3) Preparation of coating film protection film Shikoku Paper Co., Ltd. release paper with 50% n-butyl acrylate, 45% 2-ethylhexyl acrylate and 5% acrylic acid, 40% of acrylic copolymer Apply the ethyl acetate solution uniformly with a knife coater, and with hot air at 60 ° C.
It was dried for 15 minutes to form an adhesive layer, and the above-mentioned soft resin film (A-1) was attached thereto.

Then, the colored film (B-1) described above is bonded onto the soft resin film (A-1) using an acrylic adhesive in the same manner as described above, and a white target coating film is obtained. A protective film was obtained.

Example 2 (4) Preparation Example of Colored Film 20 parts of granules of an acrylic copolymer resin having a weight average molecular weight of 350,000 containing methyl methacrylate and n-butyl acrylate at a ratio of 70% and 30%, respectively, and 60 parts of toluene. And dissolved in 20 parts of xylene to form a resin solution.

Then, a coating solution was prepared by using the resin solution according to the following formulation.

100 parts of resin solution "SaP700N" 4〃 [Aluminum paste manufactured by Showa Aluminum Powder Co., Ltd.] Then, this coating solution is applied onto "Therapyle" [Releasable polyester film manufactured by Toyo Metalizing Co., Ltd.] and roll coater And apply it to a dry film thickness of 500 μm.
After drying at 00 ° C for 40 minutes, the polyester film was peeled off to obtain a metallized film (B-2).

(5) Preparation example of soft resin film "Grillax A-150" (polyamide resin manufactured by Dainippon Ink and Chemicals, Inc.) was extruded by the T-die method to have a thickness of 300 µm and a breaking strength of 220 kg / cm
² and soft resin film (A-2) with an elongation of 480%
Got

(6) Preparation Example of Film for Protecting Coating Film As the soft resin film (A), (A-2) is used in place of (A-1), and the colored film (B) is used.
As a result, a film for film protection intended for a metallic color tone was obtained in the same manner as in Example 1 except that (B-2) was used instead of (B-1).

Example 3 (7) Preparation Example of Colored Film 30 parts of polymethylmethacrylate granules having a weight average molecular weight of 300,000, "Kynar-500", and 70 parts of poly (vinylidene fluoride) manufactured by Penworth, USA , 140 parts of "Taipaque CR-90" was melted by heating, and the white film (B-3) having a thickness of 60 μm was obtained by extrusion molding by the T-die method.

(8) Preparation Example of Soft Resin Film "Evaflex P-0803" [ethylene-vinyl acetate copolymer resin manufactured by Mitsui-Dyupon Polychemical Co., Ltd.]
-By extrusion molding with a die method, the thickness is 250 μm,
A soft resin film (A-3) having a breaking strength of 180 kg / cm ² and an elongation of 600% was obtained.

(9) Preparation Example of Film for Protecting Coating Film Instead of the soft resin film (A-1), the same film (A
A white target film was obtained in the same manner as in Example 1 except that the same film (B-3) was used instead of the colored film (B-1).

Example 4 (10) Preparation Example of Colored Film 20 parts of granules of an acrylic copolymer resin having a weight average molecular weight of 350,000 and containing 70 parts and 30% of methyl methacrylate and n-butyl acrylate, respectively, and 70 parts of toluene. 1 part of "Fastastogen Blue NK" [Cyanine Blue Pigment manufactured by Dainippon Ink and Chemicals, Inc.] was mixed with the mixture, and the mixture was dispersed in a sand mill for 1 hour. And got a blue paste.

Then, a coating solution was prepared using the blue paste according to the following formulation.

Blue paste 90 parts "SaP700N" 2〃 xylene 10〃 Then, this coating solution was applied on "Therapyle" with a roll coater to a dry film thickness of 60μm and laminated.
After being dried at 110 ° C. for 30 minutes, the “therapeutic” was peeled off to obtain a blue metallic film (B-4).

(11) Preparation Example of Film for Protecting Coating Film As a colored film, instead of (B-1), (B-4)
A target film having a metallic color tone was obtained in the same manner as in Example 1 except that the target film was used.

A zinc phosphate-treated steel sheet (thickness: 0.8 mm) coated with an epoxy resin-based cationic electrodeposition coating and baked was used as a substrate, and each of the coating film-protecting films obtained in Examples 1 to 4 was used as a base material. Each of the laminated composite films was adhered to a substrate separately, and the performance of each adhered composite film was evaluated. The results shown in Table 1 were obtained.

For comparison, a vinyl chloride sol paint conventionally used is applied to the above-mentioned base material so that the dry film thickness is 300 μm and dried at 160 ° C. for 30 minutes. Comparative Example 1 is shown in Table 1. The performance evaluation of this coated product is also shown in the same table.

Note 1) The nuts specified in IIS B-1181 Class 3 M-4 are continuously dropped from a height of 2 m on a sample coated plate placed at a 60 ° inclination from the horizontal position. The total weight of nuts required to expose the base (steel plate) of the coated plate was displayed.

2) The surface condition of the sample after 500 hours of exposure was visually evaluated using "QUV" manufactured by Q-PANEL, USA. The criteria for judgment are as described below.

3) It was judged visually. The criteria for judgment at that time are as follows.

○ …… Excellent △ …… Slightly bad × …… Poor

[Brief description of drawings]

FIG. 1 is a partially enlarged cross-sectional view showing the structure of a conventional coating film protection film, and FIG. 2 is a partially enlarged cross-sectional view showing the structure of a coating film protection film of the present invention.

Claims (1)

[Claims] 1. A colored film (B) layer is laminated on one side of a soft resin film (A), while an adhesive layer is provided on the remaining one side of the soft resin film (A), and a peeling layer is further formed thereon. In the film for protecting a coating film comprising a paper layer, the resin for preparing the soft resin film (A) is a urethane resin, an ethylene-vinyl acetate copolymer resin, a polyester resin, a polyamide resin and a urethane-chloride resin, respectively. At least one resin selected from the group consisting of vinyl copolymer resins is used, and no colorant component is contained in the soft resin film (A), while the colored film (B) is used. The resin for preparing, respectively, excellent in appearance and durability, acrylic resin, ethylene-vinyl acetate copolymer resin,
At least one resin selected from the group consisting of fluororesin and polyester resin is used, and the colored film (B) layer is the resin for preparing the (B) layer,
Appearance and durability characterized by being composed of a metal powder and / or a color pigment, which is used for protecting a coating film on an already-painted plate to be protected by applying it to the plate. A film protective film with excellent properties.