JPH0780279B2 - Film for film protection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel and useful film protective film. More specifically, in the present invention, a transparent film (B) having excellent durability is laminated on one surface of a specific colored soft resin film (A) having breaking strength and elongation, while the soft resin film (A ) Is coated and laminated on one side with an adhesive layer, which is applied to an already-painted plate to be protected and is used for protecting the coating film on the painted plate, The present invention relates to a film for protecting a coating film, which has excellent appearance and durability.

The coating film-protecting film of the present invention having such a structure is mainly intended to provide a composite film for protecting a coating film formed on a substrate such as metal or plastics. In particular, an object of the present invention is to provide a film for protecting a coating film for preventing the outer coating film of a vehicle from being damaged by the impact of pebbles, rock salt, etc., which collide during traveling.

[Conventional technology]

When a vehicle is traveling, collisions such as pebbles and rock salt, that is, rock salt is removed on roads in winter in winter to prevent freezing, but in that case a large amount of rock salt collisions It is not limited to collisions due to
Or, regardless of the season, the coating film is damaged on the outside of the vehicle due to the impact of a collision such as a small stone, and the rust from the damaged portion, that is, the rust caused by so-called 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 is applied as an undercoat paint to a portion where pebbles or stone fragments scattered by the traveling of a vehicle hit. Although there is a method and it has already been put to practical use, as far as such a method is concerned, there is a limitation in film thickness and material from the viewpoint of coating workability, and it is the current situation that the purpose cannot be achieved sufficiently. There is also a method of coating a vinyl chloride sol instead of the above-mentioned coating method of the soft high film thickness type undercoat paint, but the vinyl chloride resin originally has poor weather resistance, and moreover, Plasticizers, stabilizers, and additives contained in the resin are transferred to the surface of the coating film for a long period of time and used outdoors, causing remarkable discoloration, deterioration of gloss, cracks, etc. There has been a drawback that also Shorai.

Furthermore, as another method, a method of sticking a coating film protection film is also performed, and this type of coating film protection film is said to be used by being attached to the outside of the vehicle. Therefore, naturally, it is required that the so-called coating film has an excellent appearance such as gloss, smoothness and image clarity, and in addition, it can withstand long-term outdoor use. It is also necessary to have excellent so-called durability.

By the way, as such a protective film up to now, as shown in FIG. 1, an adhesive 3 is applied to a so-called colored soft resin film 2 such as urethane resin or vinyl chloride resin. The protective film 6 in the form of coating is used.

However, these conventional protective films, the resin used there, in terms of material, has rubber elasticity, although the protective function of the coating film is sufficiently retained,
However, there is a problem in that when it is used outdoors for a long period of time, it causes a remarkable discoloration and a decrease in gloss, which leads to a decrease in aesthetics.

[Problems to be Solved by the Invention]

However, as a result of diligent research aimed at solving various problems in the conventional techniques as described above, the present inventors have provided a specific colored film and an adhesive layer on both front and back surfaces of the film via a specific resin film. The inventors have found that a film for protecting a coating film having excellent appearance and durability can be obtained by coating and laminating each separately, and completed the present invention.

[Means for solving problems]

That is, the present invention basically has a breaking strength of about 100 to
A transparent flexible film (B) having excellent durability is laminated on one side of a colored soft resin film (A) having an elongation of about 500 kg / cm ² and an elongation of about 200 to about 700%, while the soft resin film (A) ) Is adhered to the remaining one side by applying an adhesive layer, and is adhered to an already-painted plate to be protected, which is used for protecting the coating film on the painted plate.
In particular, it is intended to provide a film for protecting a coating film which is excellent in appearance and durability, and above all, as the colored flexible resin film (A), a urethane resin, an ethylene-vinyl acetate copolymer resin, a polyester, respectively. It is intended to provide a film for film protection using a resin, a polyamide resin, and a resin made of at least one kind of soft resin selected from the group consisting of urethane-vinyl chloride copolymer resin and metal powder and / or coloring pigment. On the other hand, as the transparent film (B), at least one resin selected from the group consisting of an acrylic resin, a fluororesin and an ethylene-vinyl acetate copolymer resin, and if necessary, further. To provide a film protective film using one made with a certain amount of UV absorber Is shall.

Therefore, the present invention is obtained by laminating a colored flexible resin film (A) having an excellent protective function of a coating film and a transparent film (B) having excellent durability, and further by laminating an adhesive layer to form a composite. It can be summarized that the present invention relates to a film for protecting a coating film that can simultaneously solve the problems of protecting the coating film and the appearance and durability which have been difficult in the past. Only when used can the coating be protected and provide excellent appearance and durability.

FIG. 2 illustrates the structure of the coating film protective film of the present invention having the above-described configuration. While the transparent film 1 is coated and laminated on one surface of the colored soft resin film 2,
An adhesive layer 4 is coated and laminated on the remaining one surface of the colored soft resin film 2, and a release paper layer 5 is further laminated on the adhesive layer 4 to obtain a target film protective film 7 of the present invention. It is formed.

Here, the colored soft resin film (A) described above is selected from the group consisting of resins having excellent elasticity, for example, urethane resins, ethylene-vinyl acetate copolymer resins, polyester resins, polyamide resins and urethane-vinyl chloride copolymer resins. It is composed of at least one resin and a metal powder and / or a color pigment. Typical examples of the metal powder include gold powder, silver powder, brass powder, aluminum powder or copper powder. On the other hand,
Typical color pigments include inorganic pigments such as titanium oxide, and organic pigments such as cyanine or quinacridone pigments.

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

Further, the colored flexible resin film (A) 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 durability. You can also

The colored soft film (A) is prepared by mixing a metal powder and / or a coloring pigment with a granular material or powder of various soft resins as described above to form a film by a T-die method, an inflation method or a calender method. Alternatively, a metal powder and / or a coloring pigment may be mixed with a solution of various soft resins as described above and a film may be formed by a casting method.

And the said colored soft resin film (A) is about
Has a breaking strength of 100 to about 500 kg / cm, and
It is desirable to select the resin so that the elongation is about 200 to about 700%, and also to select the amount of the metal powder and / or the coloring pigment, as the thickness of the colored flexible resin film thus obtained. Is about 50 to about 400 microns (μ
m) It is preferable to use the thing of what.

At that time, if the breaking strength is less than about 100 kg / cm ² , the film cannot withstand the impact of pebbles, rock salt, etc. that collide during running, and the film is prone to breakage, while about 500 kg / cm ² If it gets too large beyond cm ² ,
In any case, the adhesiveness with other substances tends to be poor, and the lamination with the transparent film (B) itself tends to be difficult and difficult, which is not preferable in any case.

On the other hand, if the elongation is less than about 200%, it is impossible to absorb and absorb the impact of pebbles, rock salt, etc. that collide during traveling, and the coating film to be protected may be damaged. On the other hand, if it becomes excessively large, exceeding about 700%, the desired film for film protection tends to be easily deformed, which in turn makes the work of sticking sticky. However, it becomes difficult and becomes impractical, which is not preferable in any case.

On the other hand, the transparent film (B) described above also contains a resin having excellent durability, for example, one or more resins such as an acrylic resin, a fluorine resin and an ethylene-vinyl acetate copolymer resin, which are prepared by a usual film forming method. , For example T-
It can also be adjusted by a method of forming a film by a die method, an inflation method or a calender method, or by a method of forming a film by a casting method by mixing an ultraviolet absorber if necessary in a solution of these various resins. It can be prepared.

As such an ultraviolet absorber, a conventionally known one can be applied as it is, but among them, a benzotriazole type or a benzophenone type is preferable, and the amount thereof is 0.3 with respect to 100 parts by weight of the resin for the transparent film. The proportion is preferably 30 to 30 parts by weight, and it is desirable to appropriately determine it in accordance with the required degree of durability.

The thickness of the transparent film thus obtained is 30 to 200.
It is preferably about μm.

Next, as a method for laminating the colored soft resin film (A) and the transparent film (B), for example, there is a method in which the film (A) and the film (B) are pressed under heat to be pressure-bonded. There is also a method in which an adhesive is applied to the film (A) or the film (B) and the film (B) or the film (A) is attached thereon, or the composition for a colored soft resin film and the composition for a transparent film. There is also a way to push out and.

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. Known and conventional methods are possible, and among them, the dry lamination method using a roller or a knife is particularly preferable.

Furthermore, as the release paper which can be laminated on the adhesive layer, those coated with various known release agents such as washes, silicones, and bisamides such as bisamide stearate are 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.

The coating film-protecting film of the present invention obtained as described above is, for example, used by being attached to a coating film on the outside of a vehicle. The so-called appearance, such as gloss, sharpness, and smoothness, and the so-called decorative effect, which includes colors and designs, must not be impaired. However, it is more preferable if the film for protecting a coating film of the present invention can further improve the decorative effect.

A so-called conventional type coating film protective film 6 as shown in FIG. 1 has a function of protecting the colored soft resin film 2 itself from a shock such as pebbles or rock salt that collides during traveling, and a color. This means that it has two functions: the (or coloring) function.

Therefore, the so-called durability that can withstand long-term outdoor exposure is remarkably insufficient.

On the other hand, the coating film protective film 7 of the present invention has a function of protecting the colored soft resin film (A) itself from the impact such as pebbles and rock salt that collide during traveling, and the color (or coloring). ) Addition function, and at the same time, the other transparent film (B) itself has a so-called durability function of withstanding long-term outdoor exposure, as well as a large external appearance. It is said that it was discovered under the extremely epoch-making idea that both films are laminated in such a manner that the function of improvement is shared by both films.

〔Example〕

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

Example 1 (1) Preparation of colored soft resin film 70 parts of "Pandex T-5167" [thermoplastic urethane resin manufactured by Dainippon Ink and Chemicals, Inc.] granules,
30 parts of "Taipeque CR-90" (rutile type titanium oxide manufactured by Ishihara Sangyo Co., Ltd.) is mixed and extruded by the T-die method to give a thickness of 300 µm and a breaking strength of 400 kg / cm.
A target film (A-1) having an elongation of ² and an elongation of 400% was obtained.

(2) Preparation of transparent film 100 parts of acrylic copolymer resin having a weight average molecular weight of 350,000 and containing 70% and 30% of methyl methacrylate and n-butyl acrylate, respectively, and "TINUVIN 900" [Switzerland Ciba Geiger UV absorber], and the target film (B-1) having a thickness of 60 μm by extrusion molding by the T-die method.
Got

(3) Preparation of a film for protecting a coating film "MLAY" [release paper manufactured by Shikoku Paper Co., Ltd.] has an acrylic copolymer containing 50% n-butyl acrylate, 45% 2-ethylhexyl acrylate and 5% acrylic acid. Polymeric
Apply 40% ethyl acetate solution uniformly with a knife coater,
An adhesive layer was formed by drying with hot air at 60 ° C. for 15 minutes, and the colored soft resin film (A-1) described above was attached thereto.

Then, the transparent film (B-1) described above is adhered onto the film (A-1) using an acrylic adhesive in the same manner as described above to protect the target coating film of white color. I got a film.

Example 2 (4) Preparation of Colored Soft Resin Film Instead of "Pandex T-5167", the same amount of "Grelax A-150" [polyamide resin manufactured by Dainippon Ink and Chemicals, Inc.] was used. Except that the thickness was 310 μm and the breaking strength was 250 in the same manner as in (1) of Example 1 except that
kg / in cm ^2, and the purpose film elongation is 400% (A-
2) was obtained.

(5) Preparation of Film for Protecting Coating Film Instead of the film (A-1), this film (A-
(3) of Example 1 except that it was changed to use 2).
In the same manner as described above, a target film for protecting a coating film was obtained.

Example 3 (6) Preparation of Colored Soft Resin Film Instead of "Pandex T-5167", "Evaflex P-1905" (ethylene-vinyl acetate copolymer resin manufactured by Mitsui DuPont Polychemical Co., Ltd.) was used. The thickness was 280 μm, the breaking strength was 200 kg / cm ² , and the elongation was 550 in the same manner as in (1) of Example 1 except that the same amount was used.
% Of the target film (A-3) was obtained.

(7) Preparation of transparent film 30 parts of polymethyl methacrylate granules having a weight average molecular weight of 300,000 and 70 parts of "Kina-500" (polyvinylidene fluoride manufactured by Penwalt, USA) were mixed, and T
A target film (B-2) having a thickness of 60 μm was obtained by extrusion molding using a die method.

(8) Preparation of Film for Protecting Coating Film Instead of the film (A-1), the above-mentioned film (A
-3), and the target film for protecting coating film in the same manner as in (3) of Example 1 except that this film (B-2) is used instead of the film (B-1). Got

Example 4 (9) Preparation of Colored Flexible Resin Film Instead of "Pandex T-5167", the same amount of "Grelax E-500" (polyester resin manufactured by Dainippon Ink and Chemicals, Inc.) was used. A target film (A-4) having a thickness of 300 μm, a breaking strength of 200 kg / cm ² and an elongation of 650% was obtained in the same manner as in (1) of Example 1 except that

(10) Preparation of transparent film 100 μm of “Evaflex P-0803” (same as above) and 3 parts of “Tinuvin 900” are mixed, and the target film is 70 μm thick by extrusion molding by T-die method. (B
-3) was obtained.

(11) Preparation of Film for Protecting Coating Film Instead of the film (A-1), the above-mentioned film (A
-4), and the target film for protecting coating film in the same manner as in (3) of Example 1 except that this film (B-3) was used instead of the film (B-1). Got

Example 5 (12) Preparation of Colored Flexible Resin Film 90 parts of "Pandex T-1567" granules and 5 parts of "Fastogen Blue NK" [cyanine pigment manufactured by Dainippon Ink and Chemicals, Inc.] And 5 parts of aluminum powder are mixed, and the thickness is extruded by the T-die method.
270 μm, breaking strength is 420 kg / cm ² , and elongation is 380%
A target film (A-5) was obtained.

(13) Preparation of coating film-protecting film Instead of the film (A-1), the above-mentioned film (A
A target film for protecting coating film was obtained in the same manner as in (3) of Example 1 except that -5) was used.

The zinc phosphate-treated steel sheet having a thickness of 0.8 mm was coated with an epoxy resin-based cationic electrodeposition coating, and then baked to be used as a substrate to protect each coating film obtained in Examples 1 to 5. Films for each were separately attached on this substrate.

After that, the performance of each of the thus-obtained film-adhering films for coating film protection (sample coated plate) was evaluated.

For comparison, a vinyl chloride sol paint that has been conventionally used is coated on the above base material so that the dry film thickness is 300 μm, and then dried at 150 ° C. for 30 minutes. Performance evaluation was performed.

The results are summarized in Table 1.

[Brief description of drawings]

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

Claims (6)

[Claims] 1. A breaking strength of about 100 to about 500 kg / cm ² , and
On one side of the colored soft resin film (A) having an elongation of about 200 to about 700%, the transparent film (B) having excellent durability is laminated, while on the other side of the soft resin film (A),
Characterized by coating and laminating an adhesive layer, which is characterized in that it is used for protecting a coating film on an already-painted plate to be protected by sticking to an already-painted plate. A film protective film with excellent appearance and durability. 2. The colored soft resin film (A) described above,
At least 1 selected from the group consisting of urethane resin, ethylene-vinyl acetate copolymer resin, polyester resin, polyamide resin and urethane-vinyl chloride copolymer resin.
Made from a kind of soft resin and metal powder,
The coating film protective film according to claim 1. 3. The colored soft resin film (A) described above,
At least 1 selected from the group consisting of urethane resin, ethylene-vinyl acetate copolymer resin, polyester resin, polyamide resin and urethane-vinyl chloride copolymer resin.
Made from a kind of soft resin and a metallic pigment,
The coating film protective film according to claim 1. 4. The colored soft resin film (A) as described above,
At least 1 selected from the group consisting of urethane resin, ethylene-vinyl acetate copolymer resin, polyester resin, polyamide resin and urethane-vinyl chloride copolymer resin.
The coating film protective film according to claim 1, which is made of a soft resin of one kind, a metal powder, and a metal pigment. 5. The transparent film (B) is made of at least one resin selected from the group consisting of acrylic resins, fluorine resins and ethylene-vinyl acetate copolymer resins. The coating film-protecting film as set forth in claim 1. 6. The transparent film (B) described above, and at least one resin selected from the group consisting of acrylic resin, fluorine resin and ethylene-vinyl acetate copolymer resin,
The coating film protective film according to claim 1, which is made from 0.3 to 30 parts by weight of an ultraviolet absorber with respect to 100 parts by weight of the resin.