JP2021079632A - Floor surface film - Google Patents

Abstract

To provide a floor surface film which has physical properties as a floor surface film, is excellent in peelability while maintaining flame retardancy for vehicle such as a bus, and prevents an aluminum film layer from remaining on a floor surface.SOLUTION: A floor surface film 1 in the present invention has a surface film layer 2, a printing layer 3 on a lower surface side of the surface film layer 2 and an adhesive layer 4 on a lower surface side of the printing layer 3, in which the surface film layer 2 is composed of an upper surface film layer 5, a primer layer 7 and a lower surface layer 6 from the top; a resin forming the upper surface film layer 5 is an urethane resin; a resin forming the lower surface film layer 6 is a polyvinyl chloride resin; rubber hardness of the upper surface film layer 5 is A90 to D80; and tensile elastic modulus of the lower surface film layer 6 is 1,000 MPa to 4,000 MPa.SELECTED DRAWING: Figure 1

Description

The present invention relates to, for example, a floor film used for vehicles and the like.

In recent years, due to the diversification of user requests, display films have been attached to windows and walls of vehicles such as railways and buses, and various display films have been developed.

The applicant has applied for Patent Document 1, and has a surface film layer, a printing layer on the lower surface side of the surface film layer, an intermediate adhesive resin layer on the lower surface side of the printing layer, and a lower surface side of the intermediate adhesive resin layer. An aluminum film layer and a back surface adhesive resin layer are laminated on the lower surface side of the aluminum film layer, and the surface film layer comprises a polyolefin resin, the hydride petroleum resin, and a styrene-based elastomer or an olefin-based elastomer. The content of the hydride petroleum resin in the surface film layer is 3% to 20%, the breaking stress of the surface film layer is 20 MPa or more, and the tensile elasticity of the surface film layer is 100 MPa to 700 MPa. It discloses a floor display film for a vehicle, which is characterized by being present.

JP-A-2018-91975

In Patent Document 1, the surface film layer has excellent transparency, retains strength that can withstand even when used in a harsh usage environment such as a railroad vehicle, and exhibits an excellent effect of adhesion between the surface film layer and the printing layer. .. However, two to three years have passed since the vehicle floor display film was applied to the floor, and when the vehicle floor display film was replaced, a part of the aluminum film layer remained on the floor surface, and before the replacement. It is necessary to remove the aluminum film layer remaining on the floor surface, and there is a demand for a floor surface display film for vehicles that can shorten the construction time.

By removing the aluminum film layer from the vehicle floor display film, the problem that a part of the aluminum film layer remains on the floor surface can be solved. However, since the aluminum film layer is removed from the vehicle floor display film, flame retardancy may not be maintained.

Further, in recent years, floor films for vehicles such as buses are also required, and floor films for vehicles such as buses are required to have flame retardant performance different from that for railway vehicles.

The present invention has been made in view of such a technical background, and has physical properties as a floor film, maintains flame retardancy for vehicles such as buses, has excellent peelability, and is applied to a floor surface. An object of the present invention is to provide a floor film in which no aluminum film layer remains.

In order to achieve the above object, the present invention provides the following means.

[1] A floor film having a surface film layer, a print layer on the lower surface side of the surface film layer, and an adhesive layer on the lower surface side of the print layer.
The surface film layer includes an upper surface film layer and
A primer layer laminated on the lower surface side of the upper surface film layer and
It is composed of a lower surface film layer laminated on the lower surface side of the primer layer.
The resin forming the upper surface film layer is a urethane resin.
The resin forming the lower surface film layer is a polyvinyl chloride resin.
The rubber hardness of the upper surface film layer is A90 to D80, and the rubber hardness is A90 to D80.
A floor film having a tensile elastic modulus of 1000 MPa to 4000 MPa in the lower surface film layer.

[2] As the resin forming the primer layer, at least one kind of resin selected from vinyl chloride-vinyl acetate copolymer resin, urethane resin, acrylic resin, or
The floor film according to item 1 above, which is a mixture of at least one resin selected from butyral resin, urethane resin, and acrylic resin and a vinyl chloride-vinyl acetate copolymer resin.

[3] forming amount of the primer layer floor film according to item 1 or 2 is ^{0.5g / m 2 ~2.0g / m 2} .

In the invention of [1], the floor film is provided with a surface film layer, a printing layer on the lower surface side of the surface film layer, and an adhesive layer on the lower surface side of the printing layer, and forms an upper surface film layer. Since the resin is a urethane resin and the rubber hardness of the upper surface film layer is A90 to D80, it is excellent in physical properties (wear resistance, scratch resistance) as a floor material. Further, since the surface film layer is composed of an upper surface film layer, a primer layer laminated on the lower surface side of the upper surface film layer, and a lower surface film layer laminated on the lower surface side of the primer layer, the upper surface film layer Has excellent peelability from the lower surface film layer. Further, since the resin forming the lower surface film layer is a polyvinyl chloride resin and the tensile elastic modulus of the lower surface film layer is 1000 MPa to 4000 MPa, flame retardancy can be improved. Further, since the floor film of the present invention does not have an aluminum film layer laminated, it is possible to provide a floor film in which the aluminum film layer does not remain on the floor even if the floor film is peeled off from the floor after construction. .. Also, by removing the aluminum film layer, it becomes easier to dispose of it.

In the invention of [2], the resin forming the primer layer is at least one resin selected from vinyl chloride-vinyl acetate copolymer resin, urethane resin, and acrylic resin, or butyral resin, urethane resin, and acrylic resin. Since it is a mixture of at least one kind of resin selected from the above and a vinyl chloride-vinyl acetate copolymer resin, the peelability between the upper surface film layer and the lower surface film layer can be further improved.

In the invention [3], since the formation of the primer layer is ^{0.5g / m 2 ~2.0g / m 2} , is possible to further improve the releasability of the upper surface film layer and the lower surface film layer it can.

It is sectional drawing which shows one Embodiment of the floor surface film which concerns on this invention.

An embodiment of the floor film according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the floor film 1 of the present embodiment includes a surface film layer 2, a printing layer 3 on the lower surface side of the surface film layer 2, and an adhesive layer 4 on the lower surface side of the printing layer 3. The surface film layer 2 is provided on the upper surface film layer 5, the primer layer 7 laminated on the lower surface side of the upper surface film layer 5, and the lower surface side of the primer layer 7. The resin composed of the laminated lower surface film layer 6 and forming the upper surface film layer 5 is a urethane resin, and the resin forming the lower surface film layer 6 is a polyvinyl chloride resin (PVC). The upper surface film layer 5 has a rubber hardness of A90 to D80, and the lower surface film layer 6 has a tensile elasticity of 1000 MPa to 4000 MPa.

The floor film 1 is a floor film 1 provided with a surface film layer 2 from above, a print layer 3 on the lower surface side of the surface film layer 2, and an adhesive layer 4 on the lower surface side of the print layer 3. .. Since the floor film 1 of the present invention does not laminate the aluminum film layer, the floor film 1 is provided so that the aluminum film layer does not remain on the floor even if the floor film 1 is peeled off from the floor after construction. be able to. Workability can be improved when the floor surface film 1 is peeled off from the floor surface. Also, by removing the aluminum film layer, it becomes easier to dispose of it.

The layers constituting the surface film layer 2 include an upper surface film layer 5, a primer layer 7 laminated on the lower surface side of the upper surface film layer 5, and a lower side laminated on the lower surface side of the primer layer 7. It needs to be composed of the surface film layer 6. The surface film layer 2 can protect the print layer 3. The presence of the primer layer 7 can improve the peelability between the upper surface film layer 5 and the lower surface film layer 6.

The resin forming the upper surface film layer 5 needs to be a urethane resin. Since urethane resin is used, wear resistance and scratch resistance can be improved.

The rubber hardness of the resin forming the upper surface film layer 5 needs to be A90 to D80. If it is less than A90, the dentability becomes worse, and if it exceeds D80, it becomes slippery, which is not preferable. Above all, it is more preferable that it is D50 to D70. The rubber hardness is a numerical value measured by a rubber hardness tester (A type or D type) for the resin forming the upper surface film layer.

The thickness of the upper surface film layer 5 is preferably 50 μm to 200 μm. Within this range, the abrasion resistance and scratch resistance required for the floor film 1 can be ensured. Above all, it is more preferably 90 μm to 160 μm.

The resin forming the lower surface film layer 6 needs to be a polyvinyl chloride resin. Flame retardancy can be improved by using a polyvinyl chloride resin.

The tensile elastic modulus of the lower surface film layer 6 needs to be 1000 MPa to 4000 MPa. If it is less than 1000 MPa, the dentability is deteriorated, and if it exceeds 4000 MPa, the bendability is deteriorated, which is not preferable. Above all, it is more preferably 2200 MPa to 3300 MPa.

The thickness of the lower surface film layer 6 is preferably 200 μm to 500 μm. Within this range, flame retardancy can be improved. Above all, it is more preferably 300 μm to 400 μm.

The thickness of the surface film layer 2 is preferably 250 μm to 700 μm.

The surface of the surface film layer 2 may be an embossed uneven surface.

The surface film layer 2 may appropriately contain various additives such as an antioxidant, an ultraviolet absorber, a lubricant, a heat stabilizer, a flame retardant, a weather resistant agent, a colorant, an antistatic agent, and a filler.

The printing layer 3 is laminated on the lower surface side of the surface film layer 2, and is not particularly limited, but is formed by, for example, a printing method such as gravure printing, offset printing, screen printing, transfer printing, or inkjet printing. It is a thing.

The printing ink constituting the printing layer 3 is not particularly limited, but for example, a pigment, a dye, a colorant, a filler, or the like is added to a synthetic resin such as an acrylic resin, a urethane resin, or a polyester resin. Examples thereof include those added and mixed. Usually, one diluted with a solvent or the like is used.

The adhesive layer 4 is used for adhering the floor surface to the floor surface film 1.

The resin component constituting the pressure-sensitive adhesive layer 4 is not particularly limited, and examples thereof include a pressure-sensitive adhesive and an adhesive. Adhesives such as acrylic resins, natural rubber resins, silicone resins, and urethane resins are preferable, and among them, it is more preferable to use acrylic resins in that they have strong adhesive strength and strong cohesive strength.

As the formation of the adhesive layer 4 (after drying) is ^{preferably 35g / m 2 ~150g / m 2} .

The resin forming the primer layer 7 is preferably at least one kind of resin selected from vinyl chloride-vinyl acetate copolymer resin, urethane resin, and acrylic resin, or butyral resin, urethane resin, and acrylic resin. It is preferable that it is a mixture of at least one kind of resin selected from the above and a vinyl chloride-vinyl acetate copolymer resin. Specifically, it means a mixture of vinyl chloride-vinyl acetate copolymer resin and butyral resin, a mixture of vinyl chloride-vinyl acetate copolymer resin and urethane resin, and a mixture of vinyl chloride-vinyl acetate copolymer resin and acrylic resin. Above all, a mixture of a vinyl chloride-vinyl acetate copolymer resin and a butyral resin is more preferable. By using a mixture of a vinyl chloride-vinyl acetate copolymer resin and a butyral resin, the peelability between the upper surface film layer 5 and the lower surface film layer 6 can be further improved. The resin forming the primer layer 7 is applied in a WET state and then dried to form the primer layer 7.

As the formation of the primer layer 7 (after drying) is ^{preferably 0.5g / m 2 ~2.0g / m 2} . Within this range, the peelability between the upper surface film layer 5 and the lower surface film layer 6 can be further improved. Among ^them, more preferably ^{1.5g / m 2 ~2.0g / m 2} .

The drying temperature for forming the primer layer 7 is preferably 30 ° C to 50 ° C, and more preferably 35 ° C to 45 ° C.

In the method for producing the floor film 1 according to the present invention, a primer resin is applied to one surface of a film sheet (PVC) to be the lower surface film layer 6 and dried to form a primer layer 7. Next, the urethane resin was extruded on the upper surface side of the primer layer 7 using an extruder, and the film sheet (PVC) and the urethane resin were bonded together. Next, the print layer 3 is formed by inkjet on the other surface of the film sheet (PVC) to be the lower surface film layer 6 on which the primer resin and urethane resin are not bonded. Finally, an adhesive is applied to the lower surface side of the print layer 3 to form the adhesive layer 4, and the floor film 1 is obtained.

Since the floor film 1 can display information such as imparting design, guidance information, usage classification information, advertisements, advertisements, etc., it can be effectively transmitted to passengers.

Next, specific examples of the present invention will be described, but the present invention is not particularly limited to those of these examples.

<Example 1>
A film sheet (tensile elastic modulus 3000 MPa, thickness 200 μm) made of a polyvinyl chloride resin to be the lower surface film layer 6 was prepared. ^{Next, 10 g / m 2} of primer resin (mixture of vinyl chloride-vinyl acetate copolymer resin and butyral resin) was applied to one surface of a film sheet made of polyvinyl chloride resin with WET, and dried at 40 ° C. for 3 seconds. It was. The amount of primer resin formed (after drying) was 1.8 g / m ² . Next, a film sheet made of a polyvinyl chloride resin is extruded by an extruder so that the thickness of the urethane resin having a rubber hardness of D70 is 100 μm so that the urethane resin and the surface coated with the primer resin are in contact with each other. And urethane resin were pasted together. Next, a printing process was performed by inkjet on the surface of the film sheet made of polyvinyl chloride resin, which was opposite to the surface on which the primer resin and urethane resin were bonded, to form a printing layer. Finally, a release paper coated with an adhesive made of an acrylic resin was attached to the lower surface side of the printing layer to obtain the floor film 1 shown in FIG. Note that the paper pattern is omitted in FIG. The amount of the adhesive layer formed was 150 g / m ² .

<Example 2>
The floor film 1 was set in the same manner as in Example 1 except that the rubber hardness of the resin forming the upper surface film layer 5 was changed from D70 to D50 and the thickness of the upper surface film layer 5 was changed from 100 μm to 90 μm. Obtained.

<Example 3>
The floor film 1 was set in the same manner as in Example 1 except that the rubber hardness of the resin forming the upper surface film layer 5 was changed from D70 to A95 and the thickness of the upper surface film layer 5 was changed from 100 μm to 150 μm. Obtained.

<Example 4>
The floor film 1 was obtained in the same manner as in Example 1 except that the tensile elastic modulus of the lower surface film layer 6 was changed from 3000 MPa to 2600 MPa and the thickness was changed from 200 μm to 320 μm.

<Example 5>
Similar to Example 1, except that the thickness of the upper surface film layer 5 is changed from 100 μm to 60 μm, the tensile elastic modulus of the lower surface film layer 6 is changed from 3000 MPa to 3800 MPa, and the thickness is changed from 200 μm to 370 μm. A floor film 1 was obtained.

<Comparative example 1>
A floor film was obtained in the same manner as in Example 1 except that the primer layers were not laminated.

<Comparative example 2>
A floor film was obtained in the same manner as in Example 1 except that the upper surface film layer 5 was set to be changed from urethane resin to polyolefin-based elastomer.

<Comparative example 3>
A floor film was obtained in the same manner as in Example 1 except that the lower surface film layer 6 was changed from a polyvinyl chloride resin to a urethane resin having a tensile elastic modulus of 1100 MPa and a thickness of 300 μm.

<Comparative example 4>
A floor film was obtained in the same manner as in Example 1 except that the rubber hardness of the resin forming the upper surface film layer 5 was changed from D70 to A70.

<Comparative example 5>
A floor film was obtained in the same manner as in Example 1 except that the rubber hardness of the resin forming the upper surface film layer 5 was changed from D70 to D90.

<Comparative Example 6>
A floor film was obtained in the same manner as in Example 1 except that the tensile elastic modulus of the lower surface film layer 6 was changed from 3000 MPa to 850 MPa.

<Comparative Example 7>
A floor film was obtained in the same manner as in Example 1 except that the tensile elastic modulus of the lower surface film layer 6 was changed from 3000 MPa to 4100 MPa.

<Tensile modulus measurement method>
The tensile elastic modulus of the lower surface film layer 6 means the tensile elastic modulus (MPa) of the film sheet composed of the lower surface film layer 6 in accordance with JIS K 6251-2010. The tensile elastic modulus is measured under the conditions of dumbbell-shaped No. 5, distance between chucks of 70 mm, and tensile speed of 1 mm / min, and the initial slope of the stress-strain curve is measured.

Each floor film obtained as described above was evaluated based on the following evaluation method. The results of these evaluations are shown in Table 1.

<Flame retardancy evaluation method>
A flammability test (flame retardancy test) is performed in accordance with FMVSS302 (Federal Motor Vehicle Safety Standard No. 302) (combustion test of interior materials for automobiles), and if the combustion speed (mm / min) is 100 or less, ""○", the others were "x", and "○" and above were passed.

<Scratch resistance evaluation method>
At an angle of 40 ° with respect to the side surface of the sample end cut into a 5 cm square size, 1 kg for a rod file (iron, coarseness of 30 cuts / cm, file length 70 mm, file outer diameter 3 mm, total length 140 mm) Was applied and rubbed 3 times at a speed of 30 cm / sec. Visually check the condition of the sample surface after 3 times, and if no scratches are visible, "◎", if only a few scratches are observed and it can be judged that there are virtually no scratches, "○". Those with slightly visible scratches were marked with "△", those with clearly visible scratches were marked with "x", and those with "○" or higher were rated as acceptable.

<Abrasion resistance evaluation method>
According to JIS K 7204-1999, the surface was rotated with the surface film layer side as the surface under the condition of wear paper S42 and a load of 500 g, and after rotating 2000 times, the wear loss was measured. Evaluation was made based on the following criteria, and "○" or higher was judged as acceptable.
(Criteria)
"◎" ··· 250mm ³ hereinafter referred to as "〇" ··· 250mm ^3, greater than 400mm ³ "×" ··· 400mm ³ or more

<Slipperiness evaluation method>
The slip resistance value was measured under water + dust conditions in accordance with the slipperiness test of JIS A 1454-2016. If the slip resistance value was 0.52 or more, it was evaluated as "○", if it was less than 0.52, it was evaluated as "x", and if it was "○" or more, it was evaluated as acceptable.

<Bendability evaluation method>
When the floor film produced in Examples 1 to 5 and Comparative Examples 1 to 7 was wound around a paper tube having a diameter of 3 inches and the floor film was wound around the paper tube once, no cracks were generated. "○" was set, other items were set as "x", and "○" and above were set as pass.

<Dentability evaluation method>
The amount of dent in each floor film was measured according to JIS A 1454-9.3: 2016. As the test conditions, a test jig 6.35φ was used, a load of 133 N was applied for 60 seconds, and then the amount of dent was measured using a depth gauge. Less than 0.3 mm was evaluated as "⊚", 0.3 mm or more and less than 0.5 mm was evaluated as "○", 0.5 mm or more was evaluated as "x", and "○" or more was evaluated as acceptable.

<Peelability evaluation method>
The adhesive strength was measured according to the adhesive-peeling adhesive strength test method of JIS K 6854-3 (1999). As an evaluation, if the T-type peeling was 20 N / 25 mm or more, it was evaluated as "○", if it was less than 20 N / 25 mm, it was evaluated as "x", and "○" or more was evaluated as acceptable.

As is clear from Table 1, the floor films of Examples 1 to 5 of the present invention were excellent in flame retardancy, scratch resistance, abrasion resistance, slipperiness, bendability, dentability, and peelability.

On the other hand, the floor film of Comparative Example 1 was inferior in peelability. The floor film of Comparative Example 2 was inferior in scratch resistance and abrasion resistance. The floor film of Comparative Example 3 was inferior in flame retardancy. The floor film of Comparative Example 4 was inferior in dentability. The floor film of Comparative Example 5 was inferior in slipperiness and bendability. The floor film of Comparative Example 6 was inferior in dentability. The floor film of Comparative Example 7 was inferior in bendability.

The floor film according to the present invention is suitable as, for example, a floor film for vehicles and the like.

1 ... Floor film 2 ... Surface film layer 3 ... Printing layer 4 ... Adhesive layer 5 ... Upper surface film layer 6 ... Lower surface film layer 7 ... Primer layer

Claims (3)

A floor film having a surface film layer, a printing layer on the lower surface side of the surface film layer, and an adhesive layer on the lower surface side of the printing layer, and the surface film layer is an upper surface film layer and the like. The resin which is composed of a primer layer laminated on the lower surface side of the upper surface film layer and a lower surface film layer laminated on the lower surface side of the primer layer and forms the upper surface film layer is a urethane resin. The resin forming the lower surface film layer is a polyvinyl chloride resin, the rubber hardness of the upper surface film layer is A90 to D80, and the tensile elasticity of the lower surface film layer is 1000 MPa to 4000 MPa. The characteristic floor film. As the resin forming the primer layer, at least one kind of resin selected from vinyl chloride-vinyl acetate copolymer resin, urethane resin, acrylic resin, or
The floor film according to claim 1, which is a mixture of at least one resin selected from butyral resin, urethane resin, and acrylic resin and a vinyl chloride-vinyl acetate copolymer resin. Floor film according to claim 1 or 2 formed of the primer layer is ^{0.5g / m 2 ~2.0g / m 2} .

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