Road marking sheet

Abstract

To provide a baseboard device on which a panel material can be placed when the interior panel material is fixed to a wall surface, and which is less likely to be deformed.SOLUTION: A road marking sheet 10 that is heated and adheres to an installation surface, comprising a thermoplastic base sheet 20 that softens or melts by heating during construction, and an adhesive layer 30 that is placed on the installation surface side of the base sheet 20, and the base sheet 20 contains an ethylene-vinyl acetate copolymer, and the adhesive layer 30 is composed mainly of polyamide or polyester, and the porosity of the adhesive layer 30 is 50% or more.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a road marking sheet for drawing lines, letters, symbols, etc. on a road surface to clearly indicate road centerlines, pedestrian crossings, etc. [Background technology]

[0002] Various inventions have been disclosed regarding road marking sheets for marking road surfaces with lines, letters, etc. For example, Patent Document 1 discloses a road marking sheet by the present applicant, which is made by mixing 100 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15-40% by weight and a melt index of 50-150 with 200-500 parts by weight of additives such as colorants, fillers, and reflective materials, and then melt-mixing the mixture uniformly to form a sheet.

[0003] In addition, Patent Document 2 discloses a road marking material having a hot melt adhesive laminated on one surface of a substrate, the substrate having a softening point of 90° C. or higher, and the hot melt adhesive having a softening point of 10° C. or higher at 23° C. 6 ~10 10 A road marking material is disclosed which is characterized by having an elastic modulus of 1 Pa and a softening point of 90° C. or less. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-169048 A [Patent Document 2] JP 2001-26915 A Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, asphalt-paved roads are generally assumed as roads on which the road marking sheet according to Patent Document 1 and the road surface marking material according to Patent Document 2 are to be installed. On the other hand, concrete surfaces may also be used as installation surfaces on which such road marking sheets are to be installed, and there has been a demand for a road marking sheet that can be used on installation surfaces with different surface conditions.

[0006] The present invention provides a marking sheet which solves the above-mentioned problems and has excellent workability and adhesiveness regardless of the condition of the installation surface. [Means for solving the problem]

[0007] In order to solve the above problems, the inventors conducted intensive research and discovered that by making a marking sheet consisting of a base sheet containing a specific resin component and an adhesive layer whose main component is the specific resin component, the sheet has strong adhesive strength even on asphalt pavement and concrete surfaces as the installation surface, eliminating the need for pretreatment such as applying a primer to improve adhesion, which is necessary on some installation surfaces, and thus making it possible to create a road marking sheet that can be placed in a predetermined position on the installation surface and firmly adhered to the installation surface by heat treatment, thereby completing the present invention.

[0008] In order to achieve the above object, the present invention has the following configuration. In other words, the road marking sheet of the present invention is a road marking sheet that is heated to adhere to an installation surface, and is equipped with a base sheet having thermoplasticity that softens or melts when heated during application, and an adhesive layer arranged on the installation surface side of the base sheet, wherein the base sheet contains ethylene-vinyl acetate copolymer, the adhesive layer is mainly composed of polyamide or polyester, and the adhesive layer is characterized in that it is either a nonwoven fabric made of fibers of an adhesive component, or a sponge-like structure having voids, the voids being connected in the vertical and horizontal directions. In addition, the road marking sheet of the present invention is a road marking sheet that is heated to adhere to an installation surface, and comprises a base sheet having thermoplasticity that softens or melts when heated during application, and an adhesive layer arranged on the installation surface side of the base sheet, wherein the base sheet contains ethylene-vinyl acetate copolymer, the adhesive layer is mainly composed of polyamide or polyester, and the adhesive layer has voids, and air in the gaps formed between the installation surface and the adhesive layer during application can move through the voids in the adhesive layer to the side ends of the adhesive layer. Effect of the Invention

[0009] According to the present invention, a road marking sheet with excellent workability can be obtained regardless of the condition of the installation surface. [Brief description of the drawings]

[0010] [Figure 1] 1 is a front view showing an embodiment of a baseboard device according to the present invention; [Diagram 2] FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described with reference to the drawings. In the drawings, reference numeral 10 denotes a road marking sheet. The road marking sheet 10 shown in Fig. 1 is formed in a rectangular shape.

[0012] Fig. 2 is a cross-sectional view taken along the line AA in Fig. 1. The road marking sheet 10 is made of two layers, namely, a base sheet 20 and an adhesive layer 30 disposed on the lower surface of the base sheet 20. In this embodiment, the adhesive layer 30 is formed by applying an adhesive to the lower surface of the base sheet 20.

[0013] The road marking sheet 10 is formed so that it is placed on an installation surface such as a road surface, the lower surface is brought into contact with the surface, and the upper surface is heated by a method such as burning with a flame, so that the sheet softens or melts and adheres to the installation surface. Specifically, the base sheet 20 contains, as a raw material, a binder that softens or melts when heated and cools and hardens again when the heating is stopped. In more detail, the base sheet 20 contains, as raw materials, additives such as wax and pigments in addition to the binder, which are uniformly melted and mixed and formed into a sheet to provide the base sheet 20.

[0014] As the binder, ethylene-vinyl acetate copolymer, rosin, petroleum resin, etc. can be selected or combined, and the base sheet 20 in this embodiment contains approximately 10 to 30 weight % of ethylene-vinyl acetate copolymer as a binder.

[0015] The base sheet 20 may be in the form of a long body with a constant width, or in the form of a combination of a plurality of base sheets 20. In the latter case, specifically, a rectangular base sheet 20 may have a hole penetrating in the thickness direction, and another base sheet 20 formed to match the outer diameter shape of the hole may be fitted in to form an integral structure. By forming the outer diameter shape of the hole into a letter, number, or symbol, and by changing the color tone of the other base sheet 20, it may also be used to provide information to passersby and passing vehicles. The base sheets 20 with different colors contain different pigments, but the other raw materials are almost the same.

[0016] The adhesive used in the adhesive layer 30 can be polyamide or polyester, which has a higher melting point or softening temperature than ethylene-vinyl acetate copolymer. In general, when the road marking sheet 10 is applied, the adhesive layer 30 side is placed on the application surface side, and the road marking sheet 10 is heated from the base sheet 20 side to melt it, and then cooled and solidified to adhere to the application surface. The application surface is usually assumed to be an asphalt pavement surface or a concrete surface. For example, when applied to an asphalt pavement surface, if the adhesive layer melts first when heated, the adhesive strength with the base sheet 20 side is not fully exerted, and part of the melted adhesive layer flows into the recess for asphalt, so that the adhesive strength between the base sheet 20 and the adhesive layer 30 may be partially reduced. Therefore, by using polyamide or polyester, which has a higher melting point or softening temperature than the ethylene-vinyl acetate copolymer contained in the base sheet 20, the adhesive strength is fully exerted because the base sheet 20 is also melted or softened when the adhesive layer 30 is melted or softened.

[0017] Considering the above-mentioned method of applying the road marking sheet 10, it is preferable that the thickness of the adhesive layer 30 is thin. This is because if the adhesive layer 30 is thick, when the road marking sheet 10 is heated during application, heat rises from above, and it takes time to sufficiently heat the lower side of the adhesive layer 30 that is in contact with the application surface, so that insufficient heating time may result in insufficient adhesive strength of the adhesive layer 30 to the application surface, or excessive heating time may result in thermal degradation such as discoloration of the base sheet 20.

[0018] An example of a method for forming the thin adhesive layer 30 on the lower surface of the base sheet 20 is to simultaneously mold the adhesive layer 30 when forming the base sheet 20 by extrusion molding. However, although this method can be used when the base sheet 20 is in the form of a long body with a constant width, it is difficult to use the above-mentioned method for a form in which multiple base sheets 20 are combined.

[0019] Therefore, in the present invention, the adhesive layer 30 is formed afterwards on the base sheet 20. Specifically, there are a method of directly forming a thin sheet-like adhesive layer 30 on the lower surface of the base sheet 20 by spray coating, and a method of forming a sheet-like adhesive layer 30 and then disposing it on the lower surface of the base sheet 20.

[0020] Examples of the form of the thin sheet-like adhesive layer 30 include one in which the adhesive is dissolved in a solvent to form a solution, or the adhesive is heated and melted, and the solution or molten material is spray-painted onto the underside of the base sheet 20 to form the adhesive layer 30. When the adhesive is heated and melted, it is generally difficult to reduce the thickness of the adhesive layer 30. Therefore, it is preferable that the adhesive layer 30 has voids and is formed in a sponge-like shape with the voids communicating in the vertical and horizontal directions.

[0021] By forming a sponge-like adhesive layer 30 having voids, the amount of adhesive component (basis weight) per unit area can be reduced even if the thickness of the adhesive layer 30 per unit area is increased. Therefore, when the road marking sheet 10 is arranged on the construction surface and heated, the base sheet 20 that melts first easily penetrates into the voids of the sponge-like adhesive before it melts, so the adhesive layer 30 easily melts downward, and an improvement in the adhesive strength at the interface between the base sheet 20 and the adhesive layer 30 can be expected.

[0022] The latter sheet-like adhesive layer 30 may be formed from a thin, elongated sheet by extrusion molding or from a nonwoven fabric made of fibers of the adhesive component. When a nonwoven fabric is used, the same effect as the sponge-like adhesive layer 30 described above can be expected.

[0023] When the above-mentioned adhesive layer 30 is in the form of a thin sheet, the construction surface, such as an asphalt pavement surface or concrete surface, is generally not always smooth, and therefore when the road marking sheet 10 is placed on the construction surface, gaps (air) exist between the construction surface and the adhesive layer 30. For this reason, the air may expand during heating, damaging parts of the road marking sheet 10, or gaps may remain, resulting in insufficient adhesive strength. On the other hand, when a sponge-like adhesive layer 30 having voids or an adhesive layer 30 made of nonwoven fabric is used, even if gaps (air) exist, the air can move from the voids in the adhesive layer 30 along the side ends of the adhesive layer 30, so that the remaining air can be discharged to the outside during the process of melting the adhesive layer 30 after heating, thereby making it possible to reduce gaps.

[0024] Next, an embodiment of the road marking sheet 10 according to the present invention will be described.

[0025] Example 1 An adhesive layer 30 was formed by applying a dimer acid-based polyamide (manufactured by Bostec, product name "HM4229") as an adhesive to the underside of a base sheet 20 (manufactured by Sekisui Plastics, product name "Gisline S", width 150 mm) containing an ethylene-vinyl acetate copolymer. Specifically, a solid adhesive (polyamide) was placed in a container of a hot melt spray gun, and the inside of the container was heated to 180 to 210°C to melt the polyamide, which was then applied to the bottom surface of the base sheet 20 with the bottom surface placed on the top surface to form a sponge-like adhesive layer 30. This was dried for 10 seconds to create a road marking sheet with the adhesive layer 30 solidified.

[0026] (Apparent specific gravity and porosity of adhesive layer) The apparent specific gravity of the adhesive layer 30 was calculated in accordance with the fabric test method for woven and knitted fabrics (JIS L1096). Regarding the thickness of the adhesive layer 30, when the adhesive layer 30 can be peeled off from the base sheet 20, or when a separate adhesive layer 30 is used, the thickness of the peeled adhesive layer 30 was measured. When peeling from the base sheet 20 was difficult, the thickness of the adhesive layer 30 was determined by subtracting the thickness of the base sheet 20 from the thickness of the road marking sheet 10. In addition, when the adhesive layer 30 is formed by directly applying the adhesive to the application surface, the void ratio was considered to be 0%. In the road marking sheet 10 according to this embodiment, the adhesive layer 30 can be peeled off from the base sheet 20, and the void ratio (%) was calculated from the thickness (unit: μm) of the peeled adhesive layer 30, the specific gravity (g / cm3) of the adhesive component, the basis weight (g / m2), and the apparent density (g / cm3). The measurement results of each physical property value are shown in Table 1. The void ratio (%) was calculated based on the following calculation formula. Porosity (%) = (1-apparent specific gravity) / density x 100.

[0027] (Asphalt adhesion evaluation test) The road marking sheet 10 prepared was placed on an asphalt pavement surface as the application surface, and the entire surface of the base sheet 20 was heated evenly from the top side with a propane burner (nozzle diameter 100 mm, gas pressure 0.03 MPa, burner height 100 mm) to melt the road marking sheet 10, and then cured for one hour. Next, in order to measure the adhesive strength using a Building Research Institute type adhesive tester (Building Research Institute Type Tensile Tester, manufactured by Oxjack Co., Ltd., product name "LPT-1500"), a dedicated jig was attached to the base sheet 20 with an adhesive (manufactured by Sekisui Plastics Co., Ltd., product name "Load Bond"), cured for 24 hours, and the force (kgf / cm) when pulled upward by the Building Research Institute Type Tensile Tester was measured. 2 The strength of the adhesive was measured and defined as the adhesive strength. The results of the adhesive property evaluation are shown in Table 1.

[0028] (Concrete adhesion evaluation test) The adhesive strength to the concrete surface was measured by carrying out an adhesive strength evaluation test similar to that of the asphalt adhesive strength evaluation test described above. The adhesive strength measurement results are shown in Table 1.

[0029] As shown in Comparative Example 1 and Comparative Example 2 below, each adhesive was applied to an asphalt pavement surface and a concrete surface, and curing was performed for 1 hour in Comparative Example 1 and 2 hours in Comparative Example 2 to thoroughly dry the adhesive layer 30. Next, the base sheet 20 was placed on top of the adhesive layer 30, and the base sheet 20 was heated from the upper side with a propane burner to melt the base sheet 20, and cured for 1 hour. After that, an adhesion evaluation test was performed to measure the adhesive strength between the application surface and the adhesive layer 30. Comparative Example 1 was used as the standard for the adhesive strength of the asphalt pavement surface, and Comparative Example 2 was used as the standard for the adhesive strength of the concrete surface, with each adhesive strength being set to 100. The adhesive strengths in each Example and Comparative Example in Table 1 were listed as relative values ​​to the adhesive strengths of Comparative Example 1 and Comparative Example 2.

[0030] [Table 1]

[0031] Example 2 A road marking sheet 10 was obtained by laminating a polyester nonwoven fabric (manufactured by Kureha Tech Co., Ltd., product name "G4030") as an adhesive layer 30 onto a base sheet 20 (manufactured by Sekisui Plastics Co., Ltd., product name "Gisline S", width 150 mm) containing an ethylene-vinyl acetate copolymer. The porosity of the adhesive layer 30 was calculated and an adhesion evaluation test for various application surfaces was carried out in the same manner as in Example 1. The physical property values ​​and the results of the adhesion evaluation are shown in Table 1.

[0032] Example 3 A road marking sheet 10 was obtained in the same manner as in Example 2, except that a polyamide nonwoven fabric (manufactured by Kureha Tech Co., Ltd., product name "LSN0030") was used as the adhesive layer 30. As in Example 1, the porosity of the adhesive layer 30 was calculated and an adhesion evaluation test for various application surfaces was carried out. The physical property values ​​and the adhesion evaluation results are shown in Table 1.

[0033] Comparative Example 1 In Example 1, instead of the adhesive, a solvent-based adhesive (manufactured by Sekisui Plastics, product name "Gisline S Primer") mainly composed of chloroprene rubber was used. In each adhesion evaluation, instead of applying the adhesive to the base sheet 20, the solvent-based adhesive was applied to the asphalt pavement surface and cured for 1 hour to form an adhesive layer 30, and then the base sheet 20 was placed on top of it and heated from the upper side of the base sheet 20 with a propane burner to melt the base sheet 20. After curing for 24 hours, an adhesion evaluation test for the asphalt pavement surface was carried out in the same manner as in Example 1. Note that, for the adhesive layer 30 according to this embodiment, a solvent-based adhesive was used and it was applied to the asphalt pavement surface, so the specific gravity, thickness, basis weight, apparent specific gravity, etc. were not measured, and the void ratio was set to 0% assuming that no voids were generated. The results of each adhesion evaluation are shown in Table 1.

[0034] Comparative Example 2 In Comparative Example 1, another solvent-based adhesive (manufactured by Sekisui Plastics, product name "Epo Primer C") mainly composed of epoxy resin was used. In each adhesion evaluation, instead of applying the adhesive to the base sheet 20, the solvent-based adhesive was applied to the concrete surface and cured for 1 hour to form an adhesive layer 30, and then the base sheet 20 was placed on top of it and heated from the upper side of the base sheet 20 with a propane burner to melt the base sheet 20. After curing for 24 hours, an adhesion evaluation test for the concrete surface was carried out in the same manner as in Example 1. Note that, for the adhesive layer 30 according to this embodiment, a solvent-based adhesive was used and it was applied to the concrete surface, so the specific gravity, thickness, basis weight, apparent specific gravity, etc. were not measured, and the void ratio was set to 0% assuming that no voids were generated. The results of each adhesion evaluation are shown in Table 1.

[0035] Comparative Example 3 In Example 1, a road marking sheet 10 was obtained in the same manner as in Example 1, except that an adhesive containing an ethylene-vinyl acetate copolymer (manufactured by Sanyo Life Materials Co., Ltd., product name "Puremelt P-502") was used as the adhesive to obtain a sponge-like adhesive layer 30. As in Example 1, the porosity of the adhesive layer 30 was calculated, and an adhesion evaluation test for various application surfaces was carried out. Each physical property value and each adhesion evaluation result are shown in Table 1.

[0036] Comparative Example 4 In Example 1, a nylon-based polyamide (manufactured by Arkema, product name (Platamid HX2544)) was used as the adhesive, but the nozzle of the spray gun was clogged and the adhesive could not be applied to the base sheet 20. Therefore, each adhesive property could not be evaluated.

[0037] Comparative Example 5 As the adhesive layer 30, a dimer acid polyamide (manufactured by Bostec, product name "HM4229") was pressed for 2 minutes with a hot press machine at 180 ° C. and molded into a sheet. The adhesive layer 30 was laminated on a base sheet 20 (manufactured by Sekisui Plastics, product name "Gisline S", width 150 mm) containing an ethylene-vinyl acetate copolymer to obtain a road marking sheet 10. Note that, for the adhesive layer 30 according to this embodiment, the void ratio was set to 0% assuming that no voids were generated. The adhesive layer 30 and the base sheet 20 were sequentially placed on an asphalt pavement surface as a construction surface, and the base sheet 20 was heated from the upper side with a propane burner to melt it, and cured for 24 hours. Subsequently, an adhesion evaluation test was conducted to measure the adhesive strength to the construction surface. The adhesion evaluation results are shown in Table 1.

[0038] In Comparative Example 1 and Comparative Example 2, it takes 1 hour to cure the adhesive in Comparative Example 1, and 2 hours in Comparative Example 2. That is, the adhesive application work and the application work of the base sheet 20 are separated, but in Examples 1 to 3, the adhesive application work and the application work of the base sheet 20 can be performed substantially simultaneously, and therefore, in addition to excellent workability, the adhesive strength is also excellent.

[0039] The reason why the adhesive strength of Examples 1 to 3 is higher than that of Comparative Example 1 and Comparative Example 2 is considered to be due to the influence of the difference in the form of the adhesive layer 30. Specifically, when the road marking sheet 10 is applied, the heat is applied from the base sheet 20 side, so the base sheet 20 melts first, and the adhesive layer 30 melts afterwards. In Examples 1 to 3, the porosity of the adhesive layer 30 exceeds 50%, and the air in the adhesive layer 30 can move along the side end of the adhesive layer 30, so that the amount of air that can remain in the adhesive layer 30 can be reduced, and the influence on the adhesive strength can be reduced. In addition, since the melted base sheet 20 can penetrate into the voids, it is considered that the contact area between the base sheet 20 and the adhesive layer 30 is increased, and the adhesive strength is increased. Furthermore, it is considered that the adhesive layer 30 becomes more easily melted when heated, and the adhesive strength to the application surface is more easily expressed.

[0040] Comparing Example 1 and Comparative Example 5, the material of the adhesive layer 30 is the same, but the form of the adhesive layer 30 is different in that it is a sponge-like form with voids or a thin sheet-like form without voids, and the adhesive strength to the asphalt pavement surface of Comparative Example 5 is 30% or more lower than that of Example 1. As mentioned above, when the adhesive layer 30 is in the form of a thin sheet, if gaps (air) occur between the application surface and the adhesive layer 30, it is difficult for the air to escape to the outside, and it is believed that this is why the adhesive strength is not fully expressed.

[0041] In Comparative Example 3, the adhesive layer 30 used had the same resin component as the ethylene-vinyl acetate copolymer contained in the base sheet 20 as the main component of the adhesive, and was a sponge-like adhesive layer 30 having voids like in Example 1. However, the adhesive strength to the concrete surface was inferior to Examples 1 to 3 and Comparative Example 2. [Explanation of symbols]

[0042] 10 Road marking sheet 20 Base sheet 30 Adhesive layer

Claims

1. A road marking sheet that is heated and adheres to an installation surface, A base sheet having thermoplasticity that softens or melts when heated during application; An adhesive layer disposed on the installation surface side of the base sheet, The base sheet contains an ethylene-vinyl acetate copolymer, The adhesive layer is mainly composed of polyamide or polyester, The adhesive layer is either a nonwoven fabric made of fibers of an adhesive component, or a sponge-like layer having voids, the voids being continuous in the vertical and width directions. A road marking sheet characterized by the above.

2. A road marking sheet that is heated and adheres to an installation surface, A base sheet having thermoplasticity that softens or melts when heated during application; An adhesive layer disposed on the installation surface side of the base sheet, The base sheet contains an ethylene-vinyl acetate copolymer, The adhesive layer is mainly composed of polyamide or polyester, The adhesive layer has voids, The air in the gap formed between the installation surface and the adhesive layer during application can move through the gap in the adhesive layer to the side end of the adhesive layer. A road marking sheet characterized by the above.

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