JP2011169048A - Method of attachment of road marking sheet, and road marking sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of attachment of a road marking sheet by which thermal welding of a road surface marking sheet or pressure bonding thereof without heating can be selectively performed. <P>SOLUTION: A bonding material comprises an ethylene-vinyl acetate copolymer containing 15-40 wt.% of vinyl acetate, and rosin. Additives like wax, a coloring material, a filler, a reflective material, etc. and the bonding material are compounded to make a base material composition. The base material composition is melted and mixed evenly, and is formed into a sheet shape to obtain a base material sheet. The road marking sheet is provided with the base material sheet. Since flexibility as a sheet is imparted by the ethylene-vinyl acetate copolymer, the base material sheet is heated and softened so that it may be welded to a surface to be attached. Further, by placing a pressure-sensitive adhesive on a rear surface of the base material sheet, pressure bonding can be performed without heating. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method of constructing a road marking sheet for drawing lines, characters, pictograms, symbols, etc. on a road surface, thereby indicating guidance, guidance, a road center line, a pedestrian crossing, and the like, and a road marking sheet used therefor Is.

  Various inventions have been disclosed regarding road marking sheets for marking lines, characters, etc. on the road surface. For example, Patent Document 1 discloses a colorant, a filler, a reflector, and the like with respect to 100 parts by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15 to 40% by weight and a melt index of 50 to 150. The present applicant discloses a road marking sheet in which 200 to 500 parts by weight of the additive is mixed, and these are uniformly melt-mixed and formed into a sheet shape.

  In Patent Document 2, a surface sheet having a thickness of 1 mm or less in which a base layer having retroreflective elements such as micro glass beads disposed on the front side is coated with a transparent and smooth surface coating layer has excellent adaptability to the road surface. A base sheet having a thickness of 3 mm or less or a single base sheet made of a material selected from the group consisting of unvulcanized rubber and uncured synthetic rubber and having a retroreflective element such as glass beads disposed in the vicinity of the surface. An all-weather road marking sheet material that is adhered to a part is disclosed.

Japanese Patent Publication No.53-9010 Japanese Patent Publication No. 7-57935

The road marking sheet shown in Patent Document 1 is designed so that heat is applied at the time of construction to be welded to the construction surface, and then is cooled and hardened. When this is applied without heating, the flexibility of the sheet is obtained. There was a risk of cracking and the like.
In addition, the all-weather road marking sheet material disclosed in Patent Document 2 is mainly made of unvulcanized rubber or uncured synthetic rubber, which has excellent adaptability to the road surface, and therefore cracks even when applied without heating. However, depending on the condition of the construction surface, such as large unevenness, there is a problem that the adhesion to the construction surface is weak and easy to peel compared to the road marking sheet to be heat-welded.

  Then, this invention provides the construction method of the road marking sheet which can implement freely the case where a road marking sheet is heat-welded, and the case where it crimps | bonds without heating.

In order to achieve the above object, the present invention is configured as follows.
That is, the construction method of the road marking sheet according to the present invention is the construction of the road marking sheet using the road marking sheet that can be used in both cases of heating and adhering to the construction surface and adhesion without heating. A method,
The road marking sheet is made of a binder in which an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15 to 40% by weight and rosin is blended, and an additive such as a wax, a coloring material, a filler, and a reflective material. Comprising a base material sheet that is uniformly melt-mixed and formed into a sheet shape,
When heating and adhering to the construction surface, the road marking sheet is used as it is, the base sheet is heated and welded to the construction surface, and when adhering without heating, the base The pressure-sensitive adhesive is attached to the back surface of the material sheet, and the pressure-sensitive adhesive is pressure-bonded to the construction surface.

  According to the construction method of the road marking sheet according to the present invention, the road marking sheet has a wax and a binder in which an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15 to 40% by weight and rosin are blended. Since the base material composition containing additives such as colorants, fillers, and reflectors is uniformly melted and mixed to form a base material sheet, the adhesive strength is obtained when melted by the rosin. Since the flexibility of the sheet is provided by the ethylene-vinyl acetate copolymer, the base sheet can be heated to soften the base sheet and welded to the construction surface. A pressure-sensitive adhesive can be attached to the back surface of the base sheet and can be applied without being heated, and a construction method for heat welding and a construction method for pressure bonding can be selected freely.

Further, if a road marking sheet provided with a base sheet formed from the base composition in which the ethylene-vinyl acetate copolymer is blended in an amount of 20% by weight or more and 40% by weight or less is used, the flexibility of the base sheet is improved. It is preferable because the property is good and the base sheet is less likely to be damaged such as cracks during construction or transportation.
Moreover, the base-material sheet | seat formed from the said base material composition which mix | blended the said ethylene-vinyl acetate copolymer in 20 to 40 weight% and mix | blended ethylenebis stearic acid amide in the said wax was provided. If a road marking sheet is used, the surface slippage of the base sheet, which is made more easily stickable by the blending of the ethylene-vinyl acetate copolymer, is improved. This is preferable because the adhesion of dirt can be suppressed.

  According to the road marking sheet construction method and the road marking sheet of the present invention, the base sheet provided in the road marking sheet is heated and welded, and the pressure sensitive adhesive is attached to the back surface of the base sheet without heating. It is possible to freely select the case where it is crimped to.

It is a front view which shows one Embodiment of the road marking sheet which concerns on this invention. It is sectional drawing which shows the outline | summary of the AA cross section of FIG. It is a figure which shows the state which constructed the road marking sheet | seat of FIG. 2 by heat welding. It is a figure which shows the state which made the pressure sensitive adhesive adhere to the road marking sheet | seat of FIG. It is a figure which shows the state which crimped and constructed the road marking sheet | seat of FIG. It is a table | surface which shows the mixing | blending and test result of the base material composition of the Example of the road marking sheet which concerns on this invention, and a comparative example.

Embodiments of the present invention will be specifically described with reference to the drawings.
In the drawings, 1 is a base sheet.
FIG. 1 (a) shows a road marking sheet for performing “caution” character marking, and is composed of a base sheet 1 cut out so that the outer shape represents the marking content.

FIG. 1B shows a road marking sheet for marking the number “1”.
FIG. 2 is a cross-sectional view showing an outline of the AA cross section of FIG.
The road marking sheet of the present embodiment is formed of a base sheet 1a and a base sheet 1b having a different color tone. Specifically, the base sheet 1a is cut out so that the outer shape represents the marking contents. Is formed in a cutout portion of a base material sheet 1b formed in a square shape and cut out in the same shape as the base material sheet 1a.

Reference numeral 2 denotes a protective sheet.
As shown in FIG. 2, the protective sheet 2 has a lower surface coated with an adhesive having a low adhesive force, and is attached to the upper surface of the base sheet 1a or 1b by being attached to the entire surface. The base sheet 1b and the base sheet 1a fitted in the cut-out portion are easily detached and separated in the state as they are, but the protective sheet 2 is adhered and stably until the construction time. An integral state can be maintained.
The pressure-sensitive adhesive applied to the protective sheet 2 is removed from the base sheets 1a and 1b at the time of construction work to be described later. Therefore, the adhesive is stuck to the base sheets 1a and 1b until the construction time. A material having such a small adhesive strength that it can be easily peeled off from the upper surfaces of 1a and 1b is used.

  The protective sheet 2 only needs to be able to be stably adhered to the base sheet 1a, 1b until construction, and a sheet made of synthetic resin, a woven fabric, a nonwoven fabric, paper, or the like may be used. In order to facilitate positioning of the base sheet 1a, 1b on the construction surface during construction described later, it is preferable to use a transparent synthetic resin sheet. In this embodiment, polyethylene cloth is used.

FIG. 3 is a view showing a state in which the road marking sheet of FIG. 2 is constructed by heat welding, and specifically shows a state in which the road marking sheet is heated and fixed to the installation surface.
When the road marking sheet of the present invention is applied by heat welding, the base sheet 1a, 1b is used as it is except that the protective sheet 2 is attached to the upper surface, and the base sheet 1a, After 1b is put on and the protective sheet 2 is peeled off, the base sheet 1a, 1b is melted by heating with a method such as blowing with a flame of a gas burner from above, and the base sheet 1a, 1b is melted and then solidified.
By applying a primer to the construction surface of the road marking sheet in advance, the adhesion of the road marking sheet is improved.

FIG. 4 is a view showing a state in which a pressure-sensitive adhesive is attached to the road marking sheet of FIG. 2, and the pressure-sensitive adhesive is attached to the back surface of the base sheet 1a or 1b having the protective sheet 2 attached to the upper surface. FIG. 5 is a view showing a state in which the road marking sheet of FIG. 4 is pressed and applied.
The pressure-sensitive adhesive used in the present embodiment uses a double-sided tape in which a release sheet 4 is pasted on each of the upper and lower surfaces of the pressure-sensitive adhesive layer 3, and is pasted on both sides. One side of the release sheet 4 is peeled off, and the pressure-sensitive adhesive layer 3 is attached to the lower surfaces of the base sheets 1a and 1b, and attached so as to be attached to the entire surfaces of the base sheets 1a and 1b.
At the time of construction on the installation surface, the remaining release sheet 4 is peeled off and attached to the construction surface to which primer has been applied in advance, and then the base sheet 1a, 1b is installed by hitting with a rubber hammer or the like on the protective sheet 2 The protective sheet 2 is peeled off from the upper surfaces of the base material sheets 1a and 1b.
The protective sheet 2 prevents separation of the fitted base sheets 1a and 1b, and causes problems such as scratches on the upper surfaces of the base sheets 1a and 1b when being applied without being heated as described above. It also has a function to suppress.

The pressure-sensitive adhesive used in the present embodiment is not particularly limited as long as the base sheet 1a, 1b can be pressure-bonded to the construction surface, and may be a double-sided tape. After the coating, a release sheet may be attached to protect the surface.
The material of the pressure-sensitive adhesive is not particularly limited as long as the base sheet 1a, 1b can be crimped to the construction surface. For example, a known pressure-sensitive adhesive such as an acrylic copolymer resin or a rubber adhesive can be used. In the embodiment, an adhesive of styrene / isoprene / styrene block copolymer (SIS) is used.

In addition, the road marking sheet of the present embodiment is formed by fitting the base sheet 1a to the cutout portion provided in the base sheet 1b so as to have only one thickness over the entire road marking sheet. Therefore, when it is applied by heating and melting, it can be heated uniformly over the entire surface of each of the base sheet 1a and 1b, and a portion where the welding strength is partially weakened is hardly generated. In addition, even in the case of construction by pressure bonding, the pressing force applied from the upper surface is uniformly transmitted to the pressure-sensitive adhesive layer 3 over the entire surface of each base sheet 1a, 1b, and there are places where the pressure bonding strength is partially weakened. It is difficult to occur.
Although marking may be performed by printing on the surface of the base sheet, the surface of the base sheets 1a and 1b may be slightly distorted by heat or external force in the case of heat welding or press bonding. In this embodiment, the base material sheets 1a and 1b formed so that the outer shape and the shape of the cutout portion represent the contents of the markings are fitted to each other, and even if such distortion occurs, the contents of the markings are not easily broken. Has been made.

The base sheet 1a, 1b is formed of a base composition, which is made of a binder containing an ethylene-vinyl acetate copolymer (hereinafter referred to as EVA) and rosin, a wax, In addition, additives such as colorants, fillers, and reflectors are blended to form. The base sheet 1a, 1b is formed into a sheet after the base composition is heated and melted and uniformly mixed.
Moreover, in the base material sheets 1a and 1b, different colorants are blended in the additive, and the color tone is made different.

  EVA is used to impart flexibility, impact resistance, and durability to road marking sheets. However, when the vinyl acetate content in EVA is 15% by weight or less, adhesion and flexibility are reduced. When the content is 40% by weight or more, the heat resistance and wear resistance are lowered, so the vinyl acetate content must be within the range of 15 to 40% by weight.

  As rosin, in addition to natural rosin and terpene resin, synthetic rosin-like compounds such as petroleum resin, coumarone resin, xylene formalin resin, indene resin and the like can be used in the same manner. Those esterified with glycols and the like, and those modified with formaldehyde, amines or unsaturated acids such as maleic acid can also be preferably used. These rosins are not limited to one type and may be used in combination of two or more types. Note that rosin-modified maleic acid resin and terpene resin obtained by adding maleic acid and esterifying simultaneously with rosin esterification with polyhydric alcohol are compatible with EVA compared to other rosins. It is preferable because the weather resistance and heat resistance are good and the marking sheet is not embrittled or discolored when it is applied to the road surface, and it does not decompose or discolor even if it is heated and dissolved at a high temperature during construction work.

FIG. 6 is a table showing the blending and test results of examples of the road marking sheets according to the present invention and base material compositions of comparative examples. Hereinafter, Examples 1 to 4 and Comparative Example 1 will be described.
In Example 1, 240 parts by weight of EVA having a vinyl acetate content of 28% by weight as a binder and 100 parts by weight of natural rosin are blended, and 11 parts by weight of polyethylene wax and 6 parts by weight of ethylenebisstearic acid amide are blended as waxes. Then, 110 parts by weight of calcium carbonate having a small particle size as an additive, 330 parts by weight of calcium carbonate having a large particle size, 160 parts by weight of glass beads that function as a reflective material having retroreflectivity, and 43.4 parts by weight of a coloring material are blended. 1000.4 parts by weight of the base material composition was prepared by blending all the binder, wax, and additive.
This base material composition contains 24% by weight of EVA and 0.6% by weight of ethylenebisstearic acid amide by the above-described formulation.
In Example 1, this base material composition was heated to 130 to 180 ° C., melted, uniformly mixed, then formed into a sheet and cooled and solidified.
The above-mentioned calcium carbonate with a small particle size is calcium carbonate whose particle size is adjusted so that 95% by weight or more passes through a standard sieve of 325 mesh, and the calcium carbonate with a large particle size has a standard sieve of 95% by weight or more with 28 mesh. Calcium carbonate that has been adjusted in particle size to pass through and remain on an 80 mesh standard sieve.

In Example 2, 300 parts by weight of EVA as a binder and 113 parts by weight of a hydrogenated petroleum resin are blended, and 154 parts by weight of calcium carbonate having a small particle size, 218 parts by weight of calcium carbonate having a large particle size, and 160 parts by weight of glass beads as additives. The only difference from Example 1 is that 43.4 parts by weight of the colorant is blended.
According to the above formulation, the base material composition of Example 2 contains 29.8% by weight of EVA and 0.6% by weight of ethylenebisstearic acid amide.

In Example 3, 254 parts by weight of EVA and 113 parts by weight of hydrogenated petroleum resin are blended as a binder, and 100 parts by weight of calcium carbonate having a small particle size, 318 parts by weight of calcium carbonate having a large particle size, and 160 parts by weight of glass beads as additives. Only the point that 43.4 parts by weight of the colorant is blended is different from the first and second embodiments.
According to the above formulation, the base material composition of Example 3 contains 25.3% by weight of EVA and 0.6% by weight of ethylenebisstearic acid amide.

Example 4 is different from Example 3 only in that 254 parts by weight of EVA and 113 parts by weight of natural rosin are blended as a binder.
With the above blending, the base material composition of Example 4 contains 25.3% by weight of EVA and 0.6% by weight of ethylenebisstearic acid amide.

In Comparative Example 1, 127 parts by weight of EVA and 113 parts by weight of natural rosin are blended as a binder, only 11 parts by weight of polyethylene wax is used as a wax, 260 parts by weight of calcium carbonate having a small particle size as an additive, and calcium carbonate having a large particle size The point which made the base material composition which mix | blended 285 weight part, glass bead 160 weight part, and coloring material 43.4 weight part into the sheet form differs from the said Examples 1-4.
The base material composition of Comparative Example 1 contains 12.7% by weight of EVA by the above formulation.

Next, the method of the bending test implemented with respect to Examples 1-4 and the comparative example 1 is demonstrated.
When each base material composition of Examples 1 to 4 and Comparative Example 1 blended as described above was formed into a sheet shape, it was formed into a sheet shape with a thickness of 1.2 mm, and this was cooled and solidified. Later, a 30 mm × 150 mm sample piece is prepared.
Next, each sample piece was bent so that both ends in the longitudinal direction were in contact with each other, the state A of the central bent portion was visually observed, and the flexibility of each sample piece was evaluated based on the presence or absence of breakage. Thereafter, when no breakage was confirmed in state A, a force was applied by pinching the central bent portion with a finger, and the state B of the bent portion was visually observed to again evaluate the presence or absence of cracks and breakage.
The bending test was performed at 23 ° C., 10 ° C., 5 ° C., 0 ° C., −5 ° C., −10 ° C., respectively, and the evaluation criteria were “◎: No crack in state B” “ ◯: Cracking occurred in state B, but no breakage occurred. “Δ: Breakage occurred in state B” and “X: Breakage occurred in state A”.

The result of the bending test is as shown in FIG.
In Comparative Example 1, no breakage was observed in state B at a room temperature level of 23 ° C., but breakage was observed in state B below 10 ° C., and breakage was confirmed in state A below 0 ° C.
On the other hand, in Examples 1 to 4, no breakage in state B was confirmed in the test at 10 ° C, and no breakage in state A was confirmed in the test at -10 ° C. It was confirmed to have.
This is due to the EVA contained in the base material composition, whereby the samples of Examples 1 to 4 use a construction method in which the samples are heated and melted and fixed to the installation surface by welding. However, even if using a construction method that attaches a pressure-sensitive adhesive to the back of the sheet and crimps and fixes it, it has the flexibility to work properly without causing cracks or breakage during the work, It can be confirmed that the above construction method can be selected freely.
When the content of EVA in the base material composition is less than 20% by weight, the base sheet is less flexible and more likely to break. Therefore, the content of EVA in the base material composition is 20% by weight. % Or more, and more preferably 24% by weight or more.
Also, if the EVA content in the base material composition exceeds 40% by weight, the adhesiveness of the base sheet increases and the risk of adhesion of dirt to the surface increases. Preferably, it is more preferably 30% by weight or less.

Below, the method of the contact test implemented with respect to Examples 1-4 and the comparative example 1 is demonstrated. Sample pieces of Examples 1 to 4 and Comparative Example 1 are formed to be 30 mm × 150 mm and a thickness of 1.2 mm.
This was heated to 50 ° C., one finger was pressed against the surface, and then lifted, and the state of the sample piece was evaluated by the tactile sensation of the fingertip.
The evaluation criteria are “○: No sense of sample piece sticking to lifted finger” “△: Sample piece does not lift up but feels sticky to fingertip” “×: Sample piece sticks to finger and lifts up ”Was performed in a three-step evaluation.

The result of the contact test is as shown in FIG.
In Comparative Example 1, a feeling of adhesion was felt on the fingertip, whereas in Examples 1-4, no feeling of adhesion was confirmed on the fingertip.
This is due to the ethylene bis stearic acid amide blended in the wax in the base material composition. Thus, after the samples of Examples 1 to 4 were applied to the road surface, the temperature thereof was increased by summer sunlight or the like. Even if it rises, it can be confirmed that adhesion of sand and dust to the surface is suppressed and high antifouling property is exhibited.

1 Base Material Sheet 2 Protective Sheet 3 Adhesive Layer 4 Release Sheet

Claims (4)

It is a construction method of a road marking sheet using a road marking sheet that can be used in both cases of heating and adhering to the construction surface, and when attaching without heating,
The road marking sheet is made of a binder in which an ethylene-vinyl acetate copolymer having a vinyl acetate content of 15 to 40% by weight and rosin is blended, and an additive such as a wax, a coloring material, a filler, and a reflective material. Comprising a base material sheet that is uniformly melt-mixed and formed into a sheet shape,
When heating and adhering to the construction surface, the road marking sheet is used as it is, the base sheet is heated and welded to the construction surface, and when adhering without heating, the base A construction method of a road marking sheet, characterized in that a pressure-sensitive adhesive is adhered to the back surface of a material sheet and the pressure-sensitive adhesive is pressure-bonded to a construction surface.   A road comprising a base sheet formed from the base composition in which the ethylene-vinyl acetate copolymer is blended in an amount of 20% by weight or more and 40% by weight or less, and ethylene bis-stearic acid amide is blended in the wax. The construction method of the road marking sheet according to claim 1, wherein a marking sheet is used.   It is a road marking sheet used for the construction method of the road marking sheet of Claim 1 or 2, Comprising: The said base material sheet is provided, The road marking sheet characterized by the above-mentioned.   It is a road marking sheet of Claim 3, Comprising: The pressure sensitive adhesive is adhered to the back surface of the said base material sheet, The road marking sheet characterized by the above-mentioned.

Images