JP2002188117A - Road marking work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To take it into consideration to reduce the content of VOC from the viewpoint of influence on the environmental aspect, to maintain very high recursive reflection luminance and a paint film remaining rate, to expect high durability and strong glass bead fixing power, to indicate a predominant result even under an ultravoilet ray forced deterioration condition, to have little influence by a meteorological condition such as an atmospheric temperature, humidity, and the weather in a forming process (drying time) of a paint film, and to cope even with lowering of water resistant performance such as paint film strength reduces by soaking of water. SOLUTION: A slit nozzle 6 and a microwave irradiator 7 are mutually arranged at a proper interval under a loading space 2 of a truck 1. Water paint using water as a main component of a solvent (including diluent) is used as a road marking material, and is delivered from the slit nozzle 6, and is dried by the microwave irradiator 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road marking as a traffic management facility.

[0002]

2. Description of the Related Art In Japan, the length of service on expressways is 6,6.
More than 00 km, about 4 million cars are used per day. Nearly half of all car freight traffic uses expressways, which is an important social infrastructure that supports people's lives and socio-economic activities.

In such a situation, appropriate road pavement and road marking play an extremely important role in providing a safe and comfortable road driving environment. In particular, road marking is a significant traffic control facility that concentrates the driver's attention in necessary directions and regulates traffic flow, and is an essential traffic management facility for highways that emphasize safety and smoothness.

[0004] By the way, the high-performance pavement is a pavement having continuous voids in the pavement as a structural feature, unlike the conventional dense-grain pavement. The effect of the void is expected to improve drainage and sound absorption, and is effective in reducing rainfall safety and noise. For this reason, Heisei 1
It has been used on expressways nationwide since FY0.

[0005] In the high-performance pavement, the wheel load of the vehicle is concentrated on the convex portion of the aggregate, so that conditions that easily deteriorate for the road marking overlap, and as a result, the road marking such as visibility and durability is obtained. There is a concern that the function of this will be reduced.

According to JIS K5665, one type (normal temperature), two types (heating),
Classified into species (melted). After comparing these performances, workability, economy, etc., traffic paint (solvent type) corresponding to JIS K566652 is used as a standard as a road marking material used for lane markings.

[0007] The solvent type road marking material uses a volatile organic compound (VOC) as a solvent.

[0008]

The VOC is a general term for a highly volatile organic compound, and is known as one of the causes of various environmental problems. The solvent type road marking material mainly includes toluene and xylene among VOCs. Considering their use as road marking materials,
Among the environmental problem-causing substances related to VOC, harmful air pollutants and tropospheric ozone-generating substances are strongly related.

[0009] The solvent-type road marking material has a VOC content reduced to about half that of a general solvent-type paint for building or home use. However, there are still problems from an environmental perspective. Also, this VOC is being regulated internationally.

An object of the present invention is to eliminate the disadvantages of the prior art and to reduce the VOC content from the viewpoint of environmental impact. It is possible to maintain the coating film remaining rate, and it is expected to have high durability and strong glass beads sticking force. It shows excellent results even under the conditions of forced UV deterioration, and shows the temperature, humidity, and weather during the film formation process (drying time). It is an object of the present invention to provide a road marking work which is hardly influenced by weather conditions such as the above, and which can cope with low water resistance such as a decrease in coating strength due to water immersion.

[0011]

According to the present invention, in order to achieve the above object, water is used as a road marking material as a solvent (including a diluent).
Using a water-based paint as the main component of, discharging from a slit nozzle and drying with a microwave irradiation device, and blending a heat generation accelerator with the water-based paint, furthermore, the slit nozzle and the microwave irradiation device The gist of the present invention is that the slit nozzle and the microwave irradiation device are provided separately from each other below the truck bed, or that the slit nozzle and the microwave irradiation device are provided in separate vehicles.

According to the first aspect of the present invention, a water-based paint containing water as a main component of a solvent is used as a road marking material, so that a solvent-type road marking material conventionally used as a standard is used. When it is applied to high-performance pavement, it is confirmed that the retroreflection brightness and the residual ratio of the coating film are reduced, and that the visibility and durability are also reduced. Although the water-based road marking material does not change, it maintains a very high retroreflective luminance and coating film remaining rate, shows high durability and visibility, and increases the amount of paint and glass beads used. Necessity is not recognized.

In addition, the road marking using the water-based road marking material has high durability and coating strength and strong fixing force of the glass beads, and as a result, visibility is maintained at a high level. Further, the aqueous type has a VOC content of about 5%, which is preferable from the viewpoint of environmental impact.

Also, by using a slit nozzle,
The following effects are obtained. In conventional spray coating, the line width and thickness are determined by the discharge pressure,
It is greatly affected by the tip diameter / shape, the height / angle from the road surface, the paint viscosity, the wind speed, the running speed, and the like. With the slit nozzle, it is possible to reduce the influence of these factors. Uniform and stable finish such as line width and thickness compared to the sign of conventional construction.

[0015] In the spray coating, the paint is applied with fine particles and formed into a film while forming a pattern. For this reason, the buried state of the glass beads tends to vary. In the slit nozzle, the variation in the film thickness can be reduced, and therefore, a uniform and stable buried state can be obtained. It is expected that the adhesion of the glass beads can be increased, and high visibility can be maintained.

[0016] Paint scattering is reduced, and the application amount and environmental issues become advantageous. In the spray coating, the paint is applied as fine particles by a chip, so that it is necessary to keep the paint at a distance of about 20 cm from the road surface, and scattering during this time is inevitable. It is also easily affected by wind. The slit nozzle can be set at a height of several centimeters from the road surface, so that scattering can be reduced and scattering loss can be reduced.

The apparatus can be simplified and downsized. In addition, the apparatus has a simple structure and can be manufactured at low cost.
The current marker car is equipped with a secondary / primary / secondary airless pump as a coating device, a heating device, a spray gun device, a compressor, etc., and paints at about 100 kg / cm.
It is necessary to apply a pressure of ^2, but since the slit nozzle pressure can be painted in the following pressure of 50 kg / cm ² without the need, it is possible to simplify, miniaturize the apparatus.

[0018] The same as the basis of the item, and because the slit nozzle does not require good atomization, which is essential for spray coating, it does not require conventional handling techniques and maintenance management, and simplifies the operation. Further, the conventional heating temperature can be lowered, and energy saving can be expected.

It is hard to be affected by the viscosity of the paint and the like, and the range of the paint to be applied is expanded. As a result, a high-viscosity type paint can be applied, and the volatile content can be reduced.

In addition, by drying with a microwave irradiation device, the drying property of the water-based paint can be greatly shortened even at a low temperature, and a stable adhesion to a pavement material can be obtained. It is easy to manage construction and obtain stable quality easily. Furthermore, the microwave oscillation device of the microwave irradiation device can be easily managed by controlling the output of electric power,
Also, the response is fast, the device is relatively small and the price is not so expensive. Furthermore, with the introduction of ETC, microwave control technology has been almost established.
The problem of leakage is small, and the microwave oscillating device of the microwave irradiation device is operated by electric power, so it is clean as energy and has almost no pollution.

According to the second aspect of the present invention, in addition to the above-mentioned effects, by adding a heat generation accelerator to the water-based paint, the drying and curing time can be further shortened.

According to the third aspect of the present invention, in addition to the above-mentioned functions, it is possible to expect a reduction in size and cost by equipping a single truck, simplify the construction management, and become unmanned in the future. -Robotization can be expected.

According to the fourth aspect of the present invention, it is possible to freely set the mutual interval and time between the discharge of the water-based paint from the slit nozzle and the subsequent drying by the microwave irradiation device according to the application conditions. it can.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of a coating vehicle (marker car) used in the pavement marking of the present invention, and FIG. 2 is a plan view of the same, in which a paint tank 3, a generator 4, and a glass bead tank are placed on a bed 2 of a truck 1. 5 etc. are placed. Further, a slit nozzle 6 and a microwave irradiation device 7 were provided below the loading platform 2.

Although not shown in the drawings, the paint tank 3 is provided with a rotor having screw blades and stirring blades therein and having a pump function as a delivery means, or by applying a constant pressure to the paint by air or the like. It extrudes.

The slit nozzle 6 is provided in a feed pipe from the paint tank 3 and has a paint inlet 6b at an upper portion of a nozzle body 6a and a slit-like paint outlet at a lower surface as shown in FIGS. 6c, paint is sent from the paint tank 3 to the slit nozzle 6 via the feed pipe at a constant width from the paint outlet 6c to draw a line.

Although the width of the paint outlet 6c of the slit nozzle 6 varies depending on the line to be drawn, the width is 20 cm when the road display line is a continuous line, and 15 cm when the road display line is a broken line.
45 for zebras (striped horse pattern) used at the junction
cm.

As shown in FIG. 5, the microwave radiating device 7 has a microwave oscillator 8 for generating microwave energy having a frequency of 2.45 GHz, an isolator 9 for protecting the oscillator from reflected power, and input / reflection. A power monitor 10 for protecting electric power, a matching device 11 for matching a load with an oscillator to effectively use microwaves, a connection waveguide 12 for transmitting microwaves from the oscillator to an irradiation unit, and a microwave irradiation unit 13 Consists of In the figure, 14 is a fixed distributor, and 15 is an indicator.

The microwave irradiating section 13 is generally a box-shaped open type as a hollow irradiating section. The dielectric heating including microwave heating of the microwave irradiator 7 is different from the external heating method using infrared rays in that the heating time is relatively short, the inside of the substance and the surface layer can be heated almost uniformly, and the heating efficiency is improved. , 35-45% higher than the input power,
It can be heated even under vacuum, decompression, and heating, and it can be partially heated selectively using the difference in the degree of microwave absorption of the composite substance, so that the irradiation part does not become hot and the working environment is improved. The feature is that it can be.

The relationship between the slit nozzle 6 and the microwave irradiation device 7 is such that the slit nozzle 6 is positioned forward (in a direction approaching the driver's seat) and the microwave irradiation device 7 is positioned rearward under the bed 2 of the truck 1. The distance between them is, for example, about 1 to 3 m.

Although not shown in the drawings, as another embodiment, the microwave irradiation device 7 may be provided on a vehicle (for example, a material wheel) other than the marker wheel having the slit nozzle 6. In that case, the vehicle equipped with the microwave irradiation device 7 will follow the marker vehicle having the slit nozzle 6.

An aqueous paint (water type) containing water as a main component of a solvent (including a diluent) is used as a road marking material which is stored in the paint tank 3 and flows out of the slit nozzle 6 to draw a line on a road surface or the like. I do. The main component of this water-based paint (water-based type) is an acrylic emulsion having an average molecular weight of several hundred thousand, VO
The C content is 2 to 4%, about 30 to 60 g / L, the amount of paint used is 0.4 L / m ² , and the beads from the glass bead tank 5 are 0.42 kg / m ² .

As an example, the aqueous paint (aqueous type) has the following composition, but is not limited thereto, and an aqueous paint (an aqueous type) having another composition can be used.

The emulsion of the water-based paint is generally quick-drying, and is dried in 4 to 7 minutes. The curing time can be reduced to 30 seconds or less by optionally mixing and mixing a microwave exothermic accelerator in the water-based paint. Can be greatly reduced.

The microwave exothermic promoter is not a catalytic accelerator for activating a chemical reaction, but is self-generated by induction heating by microwave irradiation to produce a self-heating accelerator. It serves to uniformly heat the inside of the object to be heated. Since these exothermic accelerators are larger than the induction heating ability of the acrylic resin composition itself irradiated with microwaves, an internal heat is generated by appropriately blending the exothermic accelerators for microwaves to produce a water-based paint (aqueous type). This facilitates heating from the inside of the device and enables heating to a predetermined temperature in a short time.

Ferrite and water are particularly useful as such a microwave exothermic accelerator. Ferrite is a crystal having a general molecular formula of the form MOFe ₂ O ₃ . M is Mn (manganese), Co (cobalt), Ni (nickel), Cu
(Copper), Mg (magnesium), Zn (zinc), Ba
(Barium) and the like and crystals containing divalent Fe (iron) are magnetite. The ferrite crystal has a spinel structure. Having Asite and Bsite, As
A state in which Fe ^{a +} occupies all of the items and half of the Bsite is called an inverse spinel.
rri magnetism appears. In general, ferrite is used as a magnetic core material for high-frequency heating because of its high electric resistance.

However, the present invention is not limited thereto, and any material having a high induction heating capability equivalent to ferrite or the like by microwave irradiation may be used as long as it has good compatibility with the object to be heated. .

When a microwave exothermic accelerator is added to an aqueous paint (aqueous type), the proportion of the aqueous component may be reduced and the viscosity may be increased. Clogging like a nozzle can be prevented.

In this way, the coating vehicle (marker vehicle) is driven, the water-based paint is discharged from the slit nozzle 6 to draw a line, and the line is dried by irradiating the microwave with the microwave irradiation device 7. However, the paint is integrated with the road surface component such as asphalt, concrete, etc., and promotes the drying of the water-based paint because it penetrates the water-based paint and induction-heats the road surface component.

As described above, when the water-based paint is used, the weather conditions such as temperature, humidity, and weather have a great influence on the film formation process (drying time). Drying by the microwave irradiation device 7 can cope with a tendency that the water resistance performance tends to be low, such as a decrease.

Next, tests performed to confirm the effects of the present invention will be described. First, the drying property was evaluated. Tables 1 to 3 below show the test results. Evaluation method: According to JIS K 5665 6.9 tire adhesion test. Test conditions: standard time 23 ° C, low temperature 5 ° C, high humidity 23
After irradiating microwaves at 90 ° C. ± 5% RH at each temperature, it was determined whether or not the coating film adhered to the tire. (Use of household microwave oven, 2.45 GH, 0.6 kW) ○ is good, △ is slightly good, × is bad Evaluation method: aqueous type standard conventional compounded product, aqueous type exothermic accelerator compounded product (A), aqueous type Heat generation accelerator compound (B) Aqueous heat generation accelerator compound (A): needle-like titanium oxide 10
%, Alumina-based fired porous body 10% blended product Aqueous heat generation promoter blended product (B): Ferrite 20% blended product

[0042]

[Table 1]

[0043]

[Table 2]

[0044]

[Table 3]

The aqueous type standard conventional compound has the following composition.

Method for Preparing Sample of the Aqueous Standard Compound A dispersant and a film-forming aid are added to an acrylic emulsion resin and sufficiently stirred. 2.1. While stirring, the color pigment is gradually added, and the mixture is sufficiently stirred. 3.2. Is gradually added while stirring, and sufficiently stirred. 4.3 Add water while stirring. Further, an antifoaming agent is gradually added and sufficiently stirred. 5. After all the raw materials have been charged, the mixture is further sufficiently stirred to confirm that there is no dispersion failure of each raw material, and the sample preparation is completed.

The aqueous type exothermic compound (A) is obtained by replacing the coloring pigment and extender with an exothermic accelerator, and the aqueous exothermic compound (B) is obtained by replacing the extender with an exothermic accelerator. It is a thing.

From the above experimental results, the aqueous type conventional compound was
Each of them dried within 1 minute under any of the conditions, and those containing the exothermic accelerator were dried within 30 seconds under any of the conditions.

Next, the adhesion was evaluated. Table 4 below
5 shows the test results. Evaluation method: JIS K 5400 8.5. According to the cross cut tape method. Test conditions: After application to asphalt block, after microwave irradiation, after 1 day under low temperature of 5 ° C, evaluation (using household microwave oven, 2.45 GH, 0.6 kW) Evaluation method: aqueous type standard conventional compound Aqueous heat-generating agent compound (A) Aqueous heat-generating agent compound (B) Aqueous heat-generating agent compound (A): needle-like titanium oxide 10
%, Calcined alumina porous material 10% compound aqueous type heat generation promoter compound (B): ferrite 20% compound

[0050]

[Table 4]

[0051]

[Table 5]

From the above experimental results, the conventional aqueous type compound was
Irradiation with microwaves for 1 minute improves the adhesiveness under any conditions, and those containing the exothermic promoter improve the adhesiveness under microwave irradiation for 30 seconds or more under any conditions. Was.

Further, the durability was evaluated. Tables 6 and 7 below show the test results. Evaluation method: According to JIS K 5400 8.8 tensile strength test. Test conditions: Microwave irradiation was dried for 30 seconds, and the test was carried out after standing indoors for 24 hours and immersing in water for 24 hours. (Use of household microwave oven, 2.45 GH, 0.6 kW) Evaluation method: Aqueous type standard conventional compounded product, Aqueous type exothermic accelerator compounded product (A) Aqueous type, exothermic accelerator compounded product (B) Aqueous type exothermic acceleration Agent formulation (A): Acicular titanium oxide 10
%, Alumina-based fired porous body 10% blended product Aqueous heat generation promoter blended product (B): Ferrite 20% blended product

[0054]

[Table 6]

[0055]

[Table 7]

From the above experimental results, it was found that the water-based standard conventional compound and the water-based exothermic accelerator compound were all dried after 30 seconds of microwave irradiation, after 1 hour from immersion in water and after 1 day in the room. Durability results equivalent to those obtained were obtained.

[0057]

As described above, the pavement marking method of the present invention can reduce the VOC content from the viewpoint of environmental impact, and can provide a very high retroreflection luminance. In addition, high durability and strong glass bead adhesion can be expected, and excellent results can be obtained even under the conditions of forced UV deterioration. It is also less susceptible to weather conditions such as weather, and can cope with low water resistance such as a decrease in the strength of the coating film due to immersion in water.

[Brief description of the drawings]

FIG. 1 is a side view of a coating vehicle (marker vehicle) used in the road marking work of the present invention.

FIG. 2 is a plan view of a coating vehicle (marker vehicle) used in the road marking work of the present invention.

FIG. 3 is a partially cutaway front view of a slit nozzle.

FIG. 4 is a bottom view of the slit nozzle.

FIG. 5 is an explanatory view showing the principle of a microwave irradiation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Truck 2 ... Packing bed 3 ... Paint tank 4 ... Generator 5 ... Glass bead tank 6 ... Slit nozzle 6a ... Nozzle body 6b ... Paint inlet 6c ... Paint outlet 7 ... Microwave irradiation device 8 ... Microwave oscillator 9 ... Isolator 10 ... Power monitor 11 ... Matching device 12 ... Connecting waveguide 13 ... Microwave irradiation part 14 ... Fixed distributor 15 ... Indicator

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinji Kato 1-4-1 Tadao, Machida, Tokyo Inside the Japan Highway Public Corporation Research Laboratory (72) Inventor Masahiro Nomura 2-17-11 Shiba, Minato-ku, Tokyo Park Shiba Building 2F Nippon Liner Co., Ltd. (72) Inventor Hideo Takeshima 2-17-11 Shiba, Minato-ku, Tokyo Park Shiba Building 2F Inside Nippon Liner Co., Ltd. (72) Inventor Shinji Sekino 2-17, Shiba, Minato-ku, Tokyo −11 Park Shiba Building 2F Nippon Liner Co., Ltd. (72) Inventor Osamu Niisato 2-17-11 Shiba Minato-ku, Tokyo Inside Park Shiba Building 2F Nippon Liner Co., Ltd. (72) Inventor Kozo Aikawa Port of Tokyo 2-17-11, Shiba-ku, Park Shiba Building 2F Nippon Liner Co., Ltd. (72) Inventor Masaki Takae 2-17-11, Shiba, Minato-ku, Tokyo Park Shiba Building 2F Nippon Liner (72) Inventor Shokichi Kikuchi 2-17-11 Shiba, Minato-ku, Tokyo Park Shiba Building 2F F-term within Nippon Liner Co., Ltd. 2D053 AA28 AB06 AD01 AD03 EA11 4D074 AA01 BB05 CC04 CC60 FF01 4D075 AC02 BB24Z BB35Z CA13 CA32 CA38 CA47 CB05 DB12 DC05 EA06 EA13 EB22 EC60

Claims (4)

[Claims] 1. A road marking material characterized by using an aqueous paint containing water as a main component of a solvent (including a diluent) as a road marking material, discharging from a slit nozzle, and drying with a microwave irradiation device. Mechanic. 2. The pavement marking work according to claim 1, wherein an exothermic accelerator is added to the water-based paint. 3. The road marking system according to claim 1, wherein the slit nozzle and the microwave irradiating device are provided below the truck bed at an appropriate distance from each other. 4. The road marking system according to claim 1, wherein the slit nozzle and the microwave irradiation device are provided on different vehicles.