JPH11256526A - Road surface marking structure and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road surface marking structure which can effectively prevent losses such as the peeling of a road surface marker when the marker is rubbed by the tires of a vehicle, etc., and which allows easy construction work. SOLUTION: In a road surface marking structure including a road surface marker fixed on a road surface via a rubber type adhesive, the rubber type adhesive is a solvent-activated rubber type adhesive. The adhesive layer comprises a solvent-activated first rubber type adhesive layer located on the road surface marker and a solvent-activated second rubber type adhesive layer located on a bonding part and is formed by bonding the first and second rubber type adhesive layers together white keeping at least either the first or second rubber type adhesive layer activated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road marking structure including a road marking material fixed on a road surface via a rubber-based adhesive, and to a method of manufacturing such a road marking structure.

[0002]

2. Description of the Related Art Conventionally, road marking materials such as an adhesive type road marking tape have been used. The operation of such a road marking material is simpler than a case where a liquid for forming the marking material after solidification is applied directly on the road surface to form the road marking material.

For example, JP-A-49-79023, JP-A-53-42424, and JP-A-4-622.
No. 10 discloses a road marking tape having a marking layer made of a material such as plastic, rubber, and resin mortar,
A construction method including a step of adhering to a road surface via an adhesive is disclosed. Usually, a rubber-based adhesive such as chloroprene is used for bonding the road marking tape. This is because an acrylic pressure-sensitive adhesive generally tends to cause a peeling phenomenon called POP OFF (pop-off) at a low temperature, and is relatively unsuitable for bonding road marking materials.

[0004]

However, in order to use a rubber-based adhesive such as chloroprene as a pressure-sensitive adhesive (pressure-sensitive adhesive), an additive such as a resin having a low softening point or a plasticizer is added. When such an additive is not contained, the tack disappears and the adhesive cannot function. However, when such additives are mixed, there is a disadvantage that the holding power of the adhesive layer is reduced, and breakage such as peeling of the road marking material is caused when the tire is traversed by a tire such as a vehicle.

That is, a first object of the present invention is to provide an adhesive layer having a high adhesive strength so as to effectively prevent breakage such as peeling of a road marking material when the tire is stepped on by a tire of a vehicle or the like. An object of the present invention is to provide a road marking structure which has a simple construction (adhesion) operation.

[0006]

In order to achieve the above object, the present invention relates to a road marking structure comprising a road marking material fixed on a road surface via a rubber adhesive layer. A pavement marking structure, characterized in that the layer consists essentially of a solvent-activated rubber-based adhesive.

[Action] In the road marking structure of the present invention, solvent activation is used as a means for bonding the road marking material to a bonding portion of the road surface, that is, a position on the road surface where the road marking material is to be arranged. It is characterized in that a mold-type rubber adhesive is used. That is, the adhesive layer interposed between the marking material and the adhesion site is substantially made of a solvent-activated adhesive, and does not need to include a pressure-sensitive adhesive layer. Therefore, the shear adhesive force is significantly improved, and the holding force is effectively increased. As a result, it is possible to effectively prevent damage such as peeling of the road marking material when the tire is stomped on by a tire of a vehicle or the like.

[0008] The adhesive layer preferably comprises a solvent-activated first rubber-based adhesive layer on the road marking material side and a solvent-activated second rubber-based adhesive layer disposed at the adhesion site. ,
The first rubber-based adhesive layer and the second rubber-based adhesive layer are bonded to each other in a state where at least one of the first and second rubber-based adhesive layers is activated. As a result, the final adhesive interface that is most likely to cause adhesive failure is
Since it is formed inside the rubber-based adhesive layer (that is, at the interface between the first rubber-based adhesive layer and the second rubber-based adhesive layer),
The effect of improving the shear adhesive strength is further enhanced. In addition, such a bonding method is the same as the construction operation when an adhesive is used for the adhesive layer, except that a relatively simple activation operation of the bonding surface is added, so that the bonding operation is also simple.

[0009] The "solvent-activated adhesive used in the present invention" (Solvent Activated Adh)
"esive)" is an adhesive that has no tack in a dry state, but exhibits tack when wet with a solvent, that is, is different from an adhesive that has tack even after drying. In the present invention, the adhesive layer made of such a pressure-sensitive adhesive is not substantially used.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Road marking material] The road marking material used in the present invention includes, for example, (a) a marking layer having a marking surface on its surface, and (b) a back surface of the marking layer (that is, an adhesive surface). ) Side and a first rubber-based adhesive layer of a solvent activation type bonded to the side.

The marking layer is formed, for example, from a synthetic rubber sheet base material. In this case, the marking surface may be the surface of the substrate itself or a colored layer formed on the surface of the substrate. The coloring layer can be formed, for example, from a coating film containing a coloring pigment (including white) and a binder. Further, the colored layer may contain a reflector such as beads or metal powder. Further, the colored layer can be formed from a commercially available retroreflective sheet.

As the base material, a sheet containing nitrile rubber is preferable. It has good adhesion to the rubber-based adhesive used in the present invention, particularly to the chloroprene-based adhesive, and can more effectively prevent breakage such as peeling of the road marking material. The thickness of the substrate is usually 1 to 10 mm
The thickness of the colored layer is usually 0.5 to 5 mm
Range.

[0013] A commercially available road surface display material can also be used as the sign layer. As specific examples, for example, “(trademark) Stamark (part number) 380” manufactured by 3M Corporation, “trademark (part number) 420” manufactured by the company, and “trademark (part number) 5” manufactured by the company
730 "and the like. Some commercially available road surface display materials have a pressure-sensitive adhesive layer for a road surface adhesive. In this case, for the purpose of the present invention, it is preferable to remove the pressure-sensitive adhesive layer before use.

The first rubber-based adhesive layer is a layer made of a solvent-activated adhesive, and contains a rubber-based polymer as an adhesive polymer. That is, the above-mentioned adhesive layer is a layer (film) having the above-described property (the property of having no tack in a dry state, but exhibiting tack when wet with a solvent).
It is. When activating the first rubber-based adhesive layer, a solvent is usually applied to the adhesive surface immediately before use. In this case, the activation is usually performed 3 seconds to 10 minutes before the contact with the second rubber-based adhesive layer disposed on the road surface.

As the rubber-based polymer, chloroprene rubber, isoprene rubber, styrene isoprene rubber, acrylic rubber, butadiene rubber and the like can be used. Preferably, it is chloroprene rubber. This is because the adhesive containing chloroprene rubber has particularly high holding power and shear adhesive strength.

The first rubber-based adhesive layer is formed, for example, by applying a coating solution that forms a solvent-activated adhesive after drying to the back of the sign layer and drying. The coating liquid usually contains the rubber-based polymer and a solvent capable of dissolving or dispersing the rubber-based polymer. Also, unless the effects of the present invention are impaired,
Various additives can be contained in the adhesive. Examples of such additives include polymers other than rubber-based polymers, fillers such as organic or inorganic particles, and crosslinking agents. Further, a primer layer containing a material capable of increasing the adhesive strength between the two layers may be disposed between the marking layer and the adhesive layer.

The coating solution is applied using a coating device such as a knife coater, a bar coater, a roll coater or a die coater, or a coating tool such as a brush, a roller or a spray. Drying can be performed by standing at room temperature or by heating.

A first adhesive layer can also be formed by bonding a solvent-free raw material into a film using an extruder or other extruder and bonding the film to the back surface of the sign layer.

The thickness of the adhesive layer is not particularly limited, but is usually in the range of 0.01 to 1.0 mm. For example, when the adhesive layer is formed by coating, if the thickness is less than 0.01 mm, the coating operation may be difficult. On the other hand, if the thickness exceeds 1.0 mm, drying takes a long time, and the work when forming the adhesive layer is performed. This is because the properties may be reduced.

As a specific example of the coating liquid for forming the above-mentioned solvent-activated adhesive, "(Part No.) S" manufactured by 3M Co., Ltd.
P44 ”,“ (part number) E44 ”,“ (part number) ”
E44T "and the like. These commercially available coating liquids are liquids containing a chloroprene rubber-based adhesive.

[Second Rubber Adhesive Layer] The second rubber adhesive layer can also be formed from the same adhesive as the first rubber adhesive layer.
For the same reason, chloroprene rubber is preferred as the rubber-based polymer.

The adhesive of the second rubber-based adhesive layer and the adhesive of the first rubber-based adhesive layer need not be the same, but preferably the same adhesive is used. When the same adhesive (that is, the same rubber-based polymer) is used, the shear bonding force at the final bonding interface (the bonding surface between the first and second rubber-based bonding layers) is effectively increased.

The second rubber-based adhesive layer can be formed in the same manner as the first rubber-based adhesive layer. For example, a coating solution containing an adhesive and a solvent is applied to a position on the road surface where the road marking material is to be arranged, using a brush, a roller, a spray, or the like,
Dry to form. The thickness of the adhesive layer is not particularly limited, but is usually in the range of 0.01 to 1.0 mm for the same reason as in the case of the first rubber-based adhesive. Especially 0.01mm
If it is thinner, it may be difficult to apply uniformly to an irregular shape of the road surface.

The activation of the second rubber-based adhesive layer can be performed in the same manner as in the case of the first rubber-based adhesive layer. In addition, the road marking of the present invention is performed using only the road-side rubber-based adhesive layer (the second rubber-based adhesive layer) formed by applying and drying the road marking material on the road where the road marking material is to be arranged. Structures can also be formed. That is, after activating the rubber-based adhesive layer on the road surface side, the above-described sign layer can be laminated on the rubber-based adhesive layer to bond the sign layer and the rubber-based adhesive layer. In this case, an adhesive layer made of a pressure-sensitive adhesive should not be disposed on the adhesive surface of the marking layer.

[Road Surface] The road surface on which the second rubber-based adhesive layer is to be formed, that is, the place where the road marking material should be placed on the road surface is not particularly limited as long as the conventional road marking material can be placed thereon. For example, it is a pavement road surface such as an asphalt pavement surface or a concrete pavement surface. Further, it may be the surface of the marking material already formed on the pavement road surface. For example, such as room temperature, warming and melting type marking materials (that is, types which solidify by drying, types which solidify after softening by heating, and types which solidify after melting),
A second rubber-based adhesive layer can be formed on a sign material formed from a sign material-forming material formed by solidification, and the road sign material used in the present invention can be adhered. This is because the road marking structure of the present invention can be directly applied to the used marking material in order to repair the old or damaged marking material that has already been used. It is advantageous.

[Manufacturing Method of Road Marking Structure] The road marking structure is formed, for example, by activating the surface of at least one of the first and second rubber-based adhesive layers and then activating the first rubber-based adhesive layer. The layer and the second rubber-based adhesive layer are bonded (manufactured (formed)). Preferably, it is formed as follows.

First, as described above, a road marking material having a first rubber-based adhesive layer is prepared. Usually, the road marking material can be prepared in advance before forming the road marking structure, and can be stored. At the stage of forming the road marking structure, the saved road surface display material is transported to a place on the road where the road marking structure is to be arranged (that is, a construction site such as a road), and the bonding operation is performed. When the road surface display material is stored and transported, it is preferable to protect the adhesive surface of the first rubber-based adhesive layer with a liner or the like.

Subsequently, a solvent-activated second rubber-based adhesive layer is fixed on the road surface at the position where the road marking material is to be arranged. As described above, the second rubber-based adhesive layer can be easily fixed at the above position by applying and drying a coating solution containing an adhesive and a solvent. The drying time depends on the thickness of the adhesive layer and the drying temperature, but usually ranges from 5 minutes to 1 day.

Further, after the surface of at least one of the first and second rubber-based adhesive layers is activated with a solvent, the first and second rubber-based adhesive layers are brought into contact with each other. As the activating solvent, any solvent can be used as long as it can dissolve the dried rubber-based adhesive. For example, acetone, methyl ethyl ketone, methyl isobutyl ketone,
Ethyl acetate, toluene and the like. When the rubber adhesive is a chloroprene rubber, ketone solvents such as acetone, methyl ethyl ketone and methyl isobutyl ketone are preferred. Such a solvent can effectively increase the shear adhesive strength when a chloroprene rubber-based adhesive is used.

The amount of the solvent to be applied to the surface of the adhesive layer is usually preferably in the range of 2.5 to 250 g / m ² .
The application of the solvent is usually performed using an application tool such as a brush, a roller, or a spray. The contact between the two adhesive layers is usually performed after a lapse of 3 seconds to 10 minutes after the application of the solvent.

Finally, the state where the first rubber-based adhesive layer and the second rubber-based adhesive layer are in contact with each other is left for a predetermined time to complete the bonding. In order to increase the adhesive force such as shearing force, it is preferable to apply pressure with a roller or the like after bringing both adhesive layers into contact with each other, and then leave the adhesive layer to stand. The leaving time is usually 5 hours to 3 days.

Further, after applying the coating solution for the first or second rubber-based adhesive layer, before one of the layers is dried, it is brought into contact with the other dried layer, and pressure is applied. The bonding can also be completed. In this case, the one undried layer is in a state activated by a solvent,
There is no need to perform a separate activation operation. Even in such a method, since the final adhesive interface is formed inside the adhesive layer formed of the two adhesive layers (the interface between the first and second rubber-based adhesive layers), the shear adhesive force is effectively increased. be able to.

The plane size of the road marking structure of the present invention is not particularly limited as long as the present invention is not impaired.
0 cm to 10 m, 3 cm to 50 cm in width.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to the examples, in Reference Examples 1 to 3 and Reference Examples A to D, samples for measuring the shear adhesive force of the road marking structure of the present invention were prepared, and the road marking structure of the present invention was prepared. The effect was confirmed.

(Reference Example 1) First, a coating solution containing the chloroprene rubber-based adhesive (the above-mentioned “(Part No.) SP44”) is applied to the release paper, dried, and dried to a first thickness of 0.1 mm.
A rubber-based adhesive layer was formed. On this first rubber-based adhesive layer, a 1.5 mm-thick nitrile rubber sheet as a marking layer was laminated to produce a road surface display material used in this example.
The nitrile rubber sheet is manufactured by 3M Corporation "(TM) St"
amark 380 ". The first rubber-based adhesive layer and the nitrile rubber sheet were bonded by using a nip roll. In addition, in order to correctly measure the shear adhesive force, a 0.5 m-thick sheet was formed on the surface of the nitrile rubber sheet (the surface opposite to the surface to which the first rubber-based adhesive layer was bonded).
An epoxy resin layer having a thickness of m and being reinforced was used as a sign material-side sample. The plane size of this marking material side sample is 5c in length.
m, 1 inch (about 2.54 cm) wide. On the other hand, a molten type road marking material ("(trademark) Bonline" manufactured by Signal Equipment Co., Ltd.) is applied on a 1 mm thick aluminum plate to form an adherend to which the marking material-side sample is adhered. The same coating liquid as that used for the first rubber-based adhesive layer was applied on the coating layer of the adherend and dried to a thickness of 0.1
A second rubber-based adhesive layer having a thickness of 2 mm was formed to obtain an adherend-side sample. The plane size of the adherend side sample is 7 cm long × 1 horizontal.
5 cm.

The application of the first rubber-based adhesive layer was performed using a knife coater, and the drying was performed at 65 ° C. for 5 minutes. Further, the application of the second rubber-based adhesive layer is as follows.
Drying was performed at room temperature (about 25 ° C.) for 20 minutes.

Finally, the release paper was removed from the above-mentioned marking material-side sample, methyl ethyl ketone was applied to the adhesive surface of the first rubber-based adhesive layer and activated, and after 3 seconds, the first rubber-based adhesive layer was removed. And the second rubber-based adhesive layer on the laminate were pressed and left in an environment of 20 ° C./65 RH% for 48 hours to form a measurement sample of this example. In this sample for measurement, so that a 4cm long gripping margin can be formed at both ends in the length direction,
The sample on the marking material side and the sample on the adherend side were shifted from each other in the length direction and were adhered to each other.

The sample of this example has an adhesive structure in which the final adhesive interface that is most susceptible to adhesive failure is inside the adhesive layer formed of two adhesive layers (the interface between the first and second rubber-based adhesive layers). Had.

Measurement of Shear Adhesion Force Using the measurement sample of this example, the shear fracture resistance when the marking material side sample moved 1 mm with respect to the adherend side sample was measured using a tensile tester. In addition, three samples were prepared in total as described above, the average of the measured values of the three samples was obtained, and the average value was defined as the shear adhesive strength. The shear adhesion in this example was 13.67 kg / in 2.

The measurement conditions were as follows: measurement environment temperature: 20 ° C., measurement environment humidity: 65 RH%, shear rate: 1 mm per minute, adhesion area: 1 square inch (about 6.45 cm ² ).

(Reference Example A) A butadiene rubber-based pressure-sensitive adhesive layer (thickness 0.15 mm) disposed only on the sample on the marking material side was used as the adhesive layer, without being activated by a solvent. A measurement sample of this example was produced in the same manner as in Reference Example 1, except that no adhesive was applied to the adherend side. The shear adhesive force measured in the same manner as in Reference Example 1 was
3.20 kg / in 2.

Reference Example B A butadiene rubber-based pressure-sensitive adhesive layer (0.15 mm thick) was used instead of the first rubber-based adhesive layer.
A styrene isoprene rubber-based pressure-sensitive adhesive layer (thickness: 0.1 mm) was used instead of the second rubber-based adhesive layer, and activation was not performed with a solvent. A measurement sample was prepared. The shear adhesive strength measured in the same manner as in Reference Example 1 was 2.40 kg / in 2.

Reference Example C A reference example 1 was repeated except that a butadiene rubber-based pressure-sensitive adhesive layer (0.15 mm thick) was used instead of the first rubber-based adhesive layer, and activation was not performed by a solvent.
In the same manner as in the above, a measurement sample of this example was produced. The shear adhesion measured in the same manner as in Reference Example 1 was 2.77 kg /
Square inches.

From the comparison between the results of Reference Example 1 and the results of Reference Examples A to C, the road marking structure of the present invention has a much higher shear adhesive strength than the case of using the conventional adhesive. Was obtained.

Reference Example 2 A measurement sample of this example was prepared in the same manner as in Reference Example 1 except that the activation solvent was changed to acetone. The shear adhesive strength measured in the same manner as in Reference Example 1 was 14.37 kg / in 2.

(Reference Example 3) Without activation by a solvent,
The measurement of this example was performed in the same manner as in Reference Example 1 except that the rubber adhesive layer before drying composed of the coating solution containing the chloroprene rubber adhesive was used instead of the dried second rubber adhesive layer. A sample for use was prepared. The shear adhesive strength measured in the same manner as in Reference Example 1 was 14.85 kg / in 2.

Production of Road Marking Structure (Example) First, a road marking material used in this example was produced in the same manner as in Reference Example 1 except that the epoxy resin was not reinforced. In addition, the plane size of this marking material is length 3
It was 0 cm x 15 cm wide.

Next, a coating layer having a thickness of 2 mm and a plane size of 3 m in length × 15 cm in width was formed on the outdoor asphalt road surface using the above-mentioned fused road marking material. On this coating layer, the above-mentioned coating solution (“SP4” manufactured by 3M Co., Ltd.)
4)) was applied and dried to form a second rubber-based adhesive layer having a thickness of 0.1 mm. The plane dimensions of the coating layer and the second rubber-based adhesive layer were 30 cm in length × 15 cm in width. Finally, the release paper of the road marking material is removed, and the first
Apply methyl ethyl ketone to the adhesive surface of the rubber adhesive layer,
The activated first rubber-based adhesive layer and the second rubber-based adhesive layer on the road surface were brought into contact with each other and left for 48 hours to complete the road marking structure of this example.

Comparative Example A butadiene rubber-based pressure-sensitive adhesive layer (0.15 mm thick) was used instead of the first rubber-based adhesive layer, and a styrene isoprene rubber-based pressure-sensitive adhesive layer was used instead of the second rubber-based adhesive layer. A thickness of 0.1 mm) was used to form the road marking structure of the present example in the same manner as in Example 1.

Tread Scrub Test For these examples and comparative examples, the actual degree of treading with the vehicle tires and the degree of damage to the road surface display material were observed.
As a result, the road marking material did not come off in the example,
In the comparative example, the portion of the road marking material rubbed with the tire was torn off. From the above results, the road marking structure of the present invention significantly improves the shear adhesive force and effectively increases the holding force. Therefore, when the tire of a vehicle or the like is stomped on, the road marking material peels off. It was confirmed that the breakage of the material could be effectively prevented.

[0051]

The road marking structure formed by using the solvent-activated rubber-based adhesive of the present invention has the same simplicity as compared with the road marking structure formed by using the conventional pressure-sensitive adhesive. And the shearability is remarkably high, so that breakage such as peeling can be effectively prevented.

Claims (2)

[Claims] 1. A road marking structure comprising a road marking material fixed on a road surface via a rubber adhesive layer, wherein the rubber adhesive layer is substantially made of a solvent-activated rubber adhesive. A road marking structure, characterized in that: 2. A method of manufacturing a road marking structure comprising a road marking material fixed on a road surface via a rubber-based adhesive layer, wherein (I) the solvent activity fixed to the bonding surface side of the road marking material. A road marking material having a first rubber-based adhesive layer made of a rubber adhesive of a mold is prepared, and (II) a solvent-activated rubber-based adhesive is placed at a position on the road surface where the road marking material is to be arranged. (III) after activating the surface of at least one of the first and second rubber-based adhesive layers with a solvent, and then bonding the first rubber-based adhesive layer with the first rubber-based adhesive layer. A method for manufacturing a road marking structure, wherein a rubber-based adhesive layer is formed by bonding the second rubber-based adhesive layer.