JP2020111678A - Paint for temporary marking, formation method of temporary marking using the same, and deletion method of temporary marking - Google Patents

Abstract

To provide a simply-executable and easily-deletable paint for temporary marking, whose trace after deletion is hard to see; and to provide a formation method of temporary marking using the same, and a deletion method of the temporary marking.SOLUTION: A paint for temporary marking contains, as a film formation component, a first resin emulsion which is resin emulsion having a softening point of 60°C or more, as much as at least 25 mass% or more in terms of a solid content ratio. A formation method of temporary marking using the same, and a deletion method of the temporary marking are also provided.SELECTED DRAWING: None

Description

The present invention relates to, for example, a water-based paint for temporary marking temporarily applied to a road surface or the like, a method for forming a temporary marking using the same, and a method for erasing the temporary marking.

Conventionally, various marking lines, road markings, and coloring are applied to the road surface using paint in order to appropriately provide information such as rules, warnings, regulations, guidance, instructions, etc. regarding road traffic to vehicle drivers and pedestrians. It has been applied (hereinafter, such paint is referred to as "road marking paint").

Formal road marking may not be applied immediately after new asphalt pavement is laid on the road or immediately after partial or complete asphalt pavement has been laid to repair the existing asphalt pavement. This is because if the pavement work spans several days, the official pavement marking will be applied when the pavement work is completed.

After the completion of asphalt pavement, until the official road marking is installed, if there is a period when there is no road marking on the road surface, the traffic division of the vehicle will not be clarified, etc. The smoothness of the flow is obstructed and the risk of traffic accidents increases. For this reason, temporary marking materials for temporary road marking are installed between immediately after asphalt paving and before official road marking is installed.

As a formal road marking paint, a heat melting type such as JIS K5663 Class 3 material, which can obtain a coating film with a high film thickness of about 1.5 mm, is often adopted. On the other hand, it is sufficient for the temporary marking material to have a short-term durability until the formal road marking is applied. Therefore, as the road marking paint, the film thickness is 0.2 mm to 0 mm. JIS K 5665 type 1 material or the like that can provide a thin film of about 4 mm is applied. In addition to the road marking paint, a tape type temporary marking material is attached to the road because it is relatively easy to remove.

Temporary marking materials are used, for example, to mark lane boundaries (white lines, etc.) to mark temporary lanes for the purpose of passing vehicles in a lane different from the original lane in the process of road pavement work. To be done. The boundary line for the temporary lane must be visible to the vehicle driver during the construction, but it must be invisible to the vehicle driver after the construction is completed to prevent confusion with the original lane boundary line. I have to.

Therefore, when the road marking is formed by using the road marking paint as the temporary marking material, the road surface should be returned to the state before the construction after the completion of the construction, that is, the state before the temporary marking material is installed ((1) ) Apply a paint of the same color (black or gray) as the road surface from above the temporary marking material, or (2) scrape off the temporary marking material with a line erasure machine so that it cannot be seen by the vehicle driver. It is generally done.

In the case of the above (1), the work itself is relatively easy, but it is aesthetically unfavorable because the coating marks remain. Further, the paint may be worn during the subsequent use of the road and the temporary marking material may be exposed, and sometimes the original road marking may be difficult to see. On the other hand, in the case of the above (2), the removal work is very difficult and takes a lot of labor, and there is also a possibility that the road surface paved at the corner is damaged.

On the other hand, when a temporary road marking is installed using a tape-type temporary marking material, it is necessary to remove it when installing a formal road marking. While the road with temporary road marking is in service, the vehicle passes over the tape and is rolled, which improves the adhesion to the road surface and the tape cannot be easily removed or peeling work is required. There is a case where the tape is cut inside, and the removing work requires a great deal of labor and time. In addition, there are cases in which tape marks remain on the road surface after peeling.

In Patent Document 1, a wax film is formed on a portion on a road surface where a temporary marking material is to be installed, and a temporary marking paint is applied on the wax film, or a tape-type temporary marking material is attached. By performing the above, a technique of forming a temporary road marking is disclosed. Then, when removing the temporary marking material, a temporary marking construction method is proposed in which the paint or tape is separated from the road surface together with the wax film by spraying a high temperature fluid or friction.

However, in the method disclosed in Patent Document 1, the number of working steps is large and complicated at the time of construction, a high temperature fluid needs to be prepared at the time of removal, and the wax film after removal needs to be sucked and collected by vacuum or the like. However, there is a problem that the work load is large.
Furthermore, temporary marking, which is easy to install and can be easily erased, and whose traces after erasure are difficult to see, is useful not only for road markings but also for various painted surfaces such as wall surfaces of structures. To be done.

JP, 2007-278036, A

Therefore, the present invention is a construction that can be easily and easily erased, and the trace after erasure is difficult to see, and a temporary marking paint, and a method of forming a temporary marking using the same, and erasing of the temporary marking. The purpose is to provide a method.

The above object is solved by the present invention described below. That is, the temporary marking paint of the present invention is characterized by containing, as a coating film forming component, at least a first resin emulsion, which is an emulsion of a resin having a softening point of 60° C. or higher, in a solid content ratio of 25% by mass or more. To do.

In the present invention, the first resin emulsion may be at least one resin emulsion selected from the group consisting of rosin-modified resin emulsion, petroleum resin emulsion, coumarone-indene resin emulsion, and terpene-modified phenol resin emulsion. ..

In the present invention, it is preferable to include, as the coating film forming component, a second resin emulsion which is an emulsion of a resin having a minimum film forming temperature of 50° C. or lower.
In this case, the second resin emulsion can be at least one resin emulsion selected from the group consisting of an acrylic resin emulsion, an alkyd resin emulsion and a vinyl acetate resin emulsion.

The method for forming a temporary marking of the present invention is characterized in that the temporary marking coating composition of the present invention is used, and the coating is applied to a surface to be coated at a temperature lower than the softening point of the resin in the first resin emulsion contained therein. And

There are the following two methods of erasing the temporary marking of the present invention. That is, one method is a temperature above the softening point of the resin in the first resin emulsion contained in the temporary marking coating used, with respect to the temporary marking formed by the method for forming a temporary marking of the present invention. The provisional marking is erased by applying heat.

The other method is an organic method capable of dissolving the resin in the first resin emulsion contained in the temporary marking coating used with respect to the temporary marking formed by the method for forming a temporary marking of the present invention. It is characterized in that the temporary marking is erased by spraying a solvent.

According to the present invention, the construction is simple and can be easily erased, and the traces after the erasure are difficult to see visually, and the temporary marking paint, and the method for forming the temporary marking using the same, and the erasing of the temporary marking. A method can be provided.

Hereinafter, the temporary marking coating material of the present invention will be described in detail first, and then the temporary marking forming method of the present invention and the temporary marking erasing method of the present invention will be described.
The temporary marking paint of the present invention is particularly suitable for use as a rule regarding road traffic for a vehicle driver traveling on a road surface, a pedestrian passing on the road surface, a worker working on the road surface, and other people who use the road surface. , A warning, regulation, guidance, instructions, etc. may be temporarily provided for marking information on the road surface.

The temporary marking paint of the present invention is used, for example, during road construction to mark a lane boundary line (white line or the like) for marking a temporary lane different from the original lane. The boundary line (road marking) for temporary lane marking formed by the temporary marking paint of the present invention is required to be erased so that it cannot be seen by the vehicle driver after the construction is completed, but the work is easy as described later. Therefore, the labor required for the work can be reduced, and the risk of road surface damage due to the erasing of the temporary marking material can be eliminated.

According to the temporary marking paint of the present invention, in addition to drawing the lane boundary line as described above, it may be used to draw characters and/or symbols on the road surface in order to make the driver or passerby visually recognize the guiding sign. it can. After the guide information including the characters and/or symbols is used, it is possible to make it invisible to the vehicle driver by heating with a flame such as a burner to cause the color of the coating film to disappear. Further, the color of the coating film can be eliminated by spraying an organic solvent in addition to the flame of a burner or the like.

In this case, "road surface" means road pavement surfaces for vehicle passage, airplane runways, factory roadways, bicycle paths, pavement surfaces such as pavements, and various pavement surfaces such as indoor and outdoor parking lots. Etc., and also includes the floor surface of a building, a work space such as a rooftop, and a floor surface that can be a living space.

Further, in the present embodiment, “pavement” means asphalt pavement, concrete pavement, paving stone pavement, or the like. Further, in the present embodiment, the “road marking” is not particularly limited, but means a mark or the like formed by painting for the purpose of marking various information on the road surface, such as a lane marking and a pedestrian crossing. , Signs including traffic signs and other information indicating prohibition of extrusion with lines, characters, symbols, patterns, etc., and also markings that visually warn, such as coloring the road surface, and signs that add design Etc. can be mentioned.

[Temporary marking paint]
The temporary marking paint of the present invention contains, as a coating film forming component, at least a first resin emulsion which is an emulsion of a resin having a softening point of 60° C. or higher, and, if necessary, a second resin emulsion. It Furthermore, the temporary marking paint of the present invention may contain other components, if necessary.
Hereinafter, the temporary marking coating material of the present invention will be described in detail for each component.

(First resin emulsion)
In the present invention, the first resin emulsion is blended as a coating film forming component and is an emulsion of a resin having a softening point of 60° C. or higher.
In the present invention, the “softening point” is a value measured by the method according to JIS K5902 (rosin) 5.3.

When a resin emulsion having a softening point of 60° C. or higher is applied at room temperature, the resin film formation is incomplete, so that the resin emulsion exists in the state of particles when water is evaporated. The resin in this particle state diffuses light and thus appears white in appearance. That is, the lumps of resin particles that are not normally provided as a coating film are in the form of a film and have a white color, and a marking of the coating film that can be practically used for temporary use (temporary marking) is formed. It

When the predetermined period ends and the temporary marking is to be erased, the coating film may be sprayed with an organic solvent or heated with a flame of a burner or the like so as to have a temperature equal to or higher than the softening point of the resin in the first resin emulsion. Heat of temperature is applied to the coating film to dissolve or melt the particulate resin to form the coating film. Then, a transparent coating film is formed. The transparency makes the temporary markings invisible, and the coating appears to have been erased.

That is, the temporary marking coating material of the present invention is used as a temporary marking coating film in a state in which the resin is in a particulate form, which is not in a state of being normally used as a coating film due to incomplete film formation. Further, when erasing the temporary marking, it is not required to remove the coating film forming the temporary marking, and by making the coating film transparent to make it substantially invisible. is there. Therefore, the temporary marking paint of the present invention is a completely new technology, which is different from the conventional road marking paints used for temporary construction in the concept, the structure, the configuration, and the handling.

In the present invention, "erasing" the temporary marking does not mean completely erasing the coating film forming the temporary marking, but by making it transparent even if the coating film remains. It means that the temporary marking is substantially invisible to a vehicle driver, a passerby, and other people who see the temporary marking.

The first resin emulsion is not particularly limited as long as it is an emulsion of a resin having a softening point of 60° C. or higher. Examples of the resin emulsion having a softening point of 60° C. or higher include a rosin-modified resin emulsion, a petroleum resin emulsion, a coumarone-indene resin emulsion, and a terpene-modified phenol resin emulsion.

Examples of the rosin-modified resin that can be used as the resin of the first resin emulsion include rosin, polyhydric alcohol, alkylphenol, rosin-modified phenolic resin that is a condensation product of formaldehyde, and rosins such as gum rosin, wood rosin, and tall oil rosin. Examples thereof include rosin ester obtained by dehydration condensation of various alcohols, and rosin-modified maleic acid resin and rosin-modified fumaric acid resin obtained by adding Diels-Alder to maleic acid or fumaric acid to a conjugated double bond of rosin resin.

Petroleum resin is obtained by polymerizing a C5 fraction or a C9 fraction obtained by thermally decomposing petroleum naphtha with an acidic catalyst. The petroleum resin emulsion usable as the first resin emulsion is a petroleum resin emulsified in an aqueous medium. The method of emulsification is not particularly limited, but after emulsifying an organic solvent solution of a modified petroleum resin in the presence of an emulsifier in an aqueous medium, a method of distilling off the organic solvent, or an organic solvent of the modified petroleum resin. A method may be mentioned in which an aqueous medium is added to the solution while stirring to carry out phase inversion emulsification, and then the organic solvent is distilled off.

The coumarone-indene resin that can be used as the resin for the first resin emulsion is a resin that uses heavy gas oil or the like separated from crude gas oil contained in the coke oven gas produced during coal carbonization as a raw material. It is a copolymer resin whose main component is styrene. The coumarone/indene resin emulsion is prepared by dissolving the coumarone/indene resin in a hydrocarbon solvent, mixing it with water in the presence of an emulsifier, and then emulsifying the solid coumarone/indene resin in an aqueous medium. A method of producing by crushing and stirring by a mechanical means has been proposed, and any of them can be used as the first resin emulsion in the present invention.

The terpene-modified phenolic resin that can be used as the resin of the first resin emulsion is obtained by reacting a terpene-based hydrocarbon such as a monoterpene-based compound and a diterpene-based compound, a phenol and an aldehyde with an acid catalyst or the like. It has been proposed that the terpene-modified phenol resin emulsion is produced by mixing the terpene-modified phenol resin with water in the presence of an emulsifier and stirring and pulverizing the mixture with a wet pulverizer.

As the first resin emulsion made of a resin having a softening point of 60° C. or higher, a rosin-modified resin emulsion is particularly preferable from the viewpoint of solubility in an organic solvent when erasing the temporary marking and meltability during heating.

The softening point of the resin in the first resin emulsion is required to be 60°C or higher, preferably 80°C or higher, more preferably 100°C or higher. If the softening point of the resin in the first resin emulsion is sufficiently high, the temporary marking will not be formed into a film at room temperature and will be in a good particulate form, and the visibility will be good. The durability of the coating film as a road marking is further improved.

In the present invention, the content of the first resin emulsion is 25% by mass or more, preferably 30% by mass or more, and 55% by mass or more, based on the solid content ratio in the coating film forming component. Is more preferable, 60% by mass or more is further preferable, and 65% by mass or more is particularly preferable. If the content of the first resin emulsion is too small, the white color as a temporary marking may not be sufficiently developed.

In the present invention, the term “coating film-forming component” refers to a solid content that forms a coating film that constitutes the temporary marking after the temporary marking paint is applied to the surface to be coated and dried and cured. In addition to the above resin emulsion, the second resin emulsion described below is, of course, a concept including all other resins and solid contents such as various pigments described later.

(Second resin emulsion)
In the present invention, the coating film-forming component need only include the first resin emulsion described above, and may be composed of only the first resin emulsion, but the minimum film forming temperature is 50°C. It is preferable to use a second resin emulsion which is an emulsion of the following resin in combination. The first resin emulsion alone, which is an emulsion of a resin having a softening point of 60° C. or higher, becomes powdery when applied and the resin film formation is incomplete, and the durability of the coating film is not very high. Durability can be further improved by using the resin emulsion of (1).

The minimum film forming temperature (MFT) is the minimum temperature at which a uniform film without cracks is formed when the water content of the resin emulsion evaporates and dries. That is, when applied at a temperature of MFT or higher, a sound coating without cracks is formed, but when applied at a temperature of lower than MFT, no coating is formed or cracks are generated. Incomplete coating tends to occur.

The MFT in this embodiment can be measured by the method described in JIS K 6828-2 (Synthetic resin emulsion-Part 2: Determination of whitening temperature and minimum film forming temperature).

The "softening point" of the resin in the first resin emulsion and the "MFT" of the resin in the second resin emulsion do not have a relationship in which the measured values clearly correlate, but that of the first resin emulsion It is inevitable that there is no resin that satisfies the conditions and also satisfies the conditions of the second resin emulsion, and that they are different resin emulsions.

The MFT of the resin in the second resin emulsion may be 50°C or lower, preferably 40°C or lower, and more preferably 30°C or lower. Even if the MFT of the resin itself in the resin emulsion to be used is 50° C. or higher, a film-forming aid or a water-soluble solvent may be added to the resin emulsion to adjust the MFT to 50° C. or lower. In this case, it is understood that the resin emulsion after adjustment corresponds to the "second resin emulsion" in the present invention.

The type of the second resin emulsion is not particularly limited as long as it is a material capable of forming a transparent coating film by itself, and specifically, for example, acrylic resin emulsion, alkyd resin emulsion, vinyl acetate resin emulsion, etc. Can be mentioned as a suitable thing.

Acrylic resins usable as the resin of the second resin emulsion include methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate. Examples thereof include polymers or copolymers of acrylic acid ester or methacrylic acid ester compounds and resins obtained by polymerizing or copolymerizing these with a compound having an ethylenically unsaturated group such as styrene or vinyl acetate. Further, the acrylic resin may be a polymer in which a reactive functional group such as a carboxyl group, an epoxy group, a carbonyl group, an amino group, and a carbon-carbon double bond is introduced into the molecule. The acrylic resin emulsion is produced by emulsion polymerization or forced emulsification.

The alkyd resin is a resin obtained by reacting a drying oil such as linseed oil, tung oil, soybean oil or the like, or an unsaturated fatty acid constituting them, a polybasic acid such as phthalic anhydride and a polyhydric alcohol such as glycerin. A typical example of the alkyd resin is a glyptal resin using phthalic anhydride and glycerin as main raw materials, and can also be suitably used as the second resin emulsion in the present invention. Alkyd resin emulsions are generally produced by forced emulsification.

The vinyl acetate resin emulsion is obtained by emulsion-polymerizing vinyl acetate, ethylene and vinyl acetate, or a (meth)acrylic acid ester monomer and vinyl acetate in the presence of a protective colloid. Can be preferably used as the resin emulsion.

In the present invention, as the lower limit value of the content of the second resin emulsion, if it is included even a little, it can be expected to have an effect of improving durability as it is included, and there is no limitation on the lower limit value, but sufficient effect of improving durability is obtained. In consideration of the above, the solid content ratio in the coating film forming component is preferably 5% by mass or more, and more preferably 10% by mass or more. On the other hand, there is no limitation on the upper limit of the content of the second resin emulsion, as long as the content of the first resin emulsion is sufficiently secured.

(Other ingredients)
The temporary marking paint of the present invention may contain other components, if necessary, in addition to the first resin emulsion and the second resin emulsion described above. Other components that can be blended include pigments, dyes, and various additives.

In the temporary marking paint of the present invention, pigments and dyes can be appropriately blended, but it is preferable that they have coloring power, that is, substantially no colorant. By substantially not containing the coloring agent, only the resin particles derived from the first resin emulsion are responsible for the color formation of the temporary marking, and when the temporary marking is erased, there is no concern about a trace of the coloring agent.

The term "substantially free" as used herein means not only a state in which no colorant is contained but also visible on the surface to be coated when the coating film is made transparent to erase the temporary marking. It is a concept that includes a content that does not cause color to develop to the extent that it does not occur. For example, in order to distinguish it from other paints or for design reasons when trading as paints, the amount of coloring is such that it develops in the paint state and is not visible after the temporary marking is formed or after it is erased. It is conceivable that an agent is included, and in that case, it is naturally understood that it is “substantially free”.

However, when the temporary marking is erased, any colorant that loses its color due to contact with an organic solvent or heating can be used. For example, a thermochromic dye can be used.
On the other hand, the extender pigment has a refractive index close to that of the resin and a small hiding power, and thus can be used within a range not impairing transparency. Examples of extender pigments that can be blended in the temporary marking paint of the present invention include calcium carbonate, talc, and precipitated barium sulfate.

Further, when the temporary marking is provided on the road surface, it is also possible to mix retro-reflecting materials such as glass beads or to spray them at the time of coating in order to obtain night visibility of the vehicle driver. Furthermore, for example, after erasing the temporary markings provided on the road surface, add a matting material such as amorphous silica so that the line traces of the transparent resin remaining after the erasure are inconspicuous to the occupants of the oncoming vehicle. Can also

Further, in the temporary marking paint of the present invention, various additives are appropriately selected and added alone or in combination of two or more kinds for the purpose of improving coating workability, coloring, paint properties, coating film properties and the like. can do. Examples of additives that can be added to the temporary marking paint of the present invention include film-forming aids, precipitation inhibitors, thixotropic agents, flow regulators, antifouling agents, drying improvers, antifreeze agents, defoamers, etc. Are listed. These additives are added for the purpose of imparting fluidity to the material and improving workability.

The content of the additive is such that it is added within a range that achieves the above-mentioned object, and is not particularly limited, and it is preferable to add within a range that does not affect the function of the present invention.
The temporary marking coating material of the present invention is mixed with the above-described blending components, and the blending components are homogenized by stirring with a stirrer or by hand without a stirrer using a stirring rod. Can be mixed and manufactured.

[Method of forming temporary sign]
The method for forming the temporary marking of the present invention uses the temporary marking coating material of the present invention described above, and applies the coating to the surface to be coated at a temperature lower than the softening point of the resin in the first resin emulsion contained therein. Characterize.
The specific application method is not limited, and a conventionally known method can be used.

That is, the temporary marking paint of the present invention described above is used at room temperature by using a conventionally known construction machine (in the case of working in a low temperature environment such as application to a road surface in winter, the first resin emulsion contained therein). The temperature may be appropriately heated within a range below the softening point of the resin in 1) and then applied as it is. As a coating method, roller coating, brush coating, airless spraying, air spraying and the like are possible, but the coating method is not limited as long as the desired coating film can be formed.

The thickness of the coating film to be formed is sufficient as long as the function as a temporary structure can be secured, and in order to reduce the effort and labor at the time of erasing, it may be thinner than the film thickness at the time of ordinary road marking etc. preferable. Specifically, it is preferable to apply the coating so that the thickness is in the range of about 0.01 mm to 1 mm.

In addition, for the purpose of increasing durability and painting various colors, the temporary marking paint of the present invention and other paints are overcoated on the coating film formed by the temporary marking paint of the present invention. It is also possible to do so.

[How to delete temporary markings]
The method of erasing the temporary marking of the present invention is a method of erasing the temporary marking formed by the method of forming the temporary marking of the present invention described above, and there are two methods: a method by heating and a method using an organic solvent.

(Method by heating)
The method of erasing by heating the temporary marking of the present invention, the temporary marking by applying heat to the temporary marking at a temperature not lower than the softening point of the resin in the first resin emulsion contained in the temporary marking coating used. Characterized by erasing the markings.

The temporary marking is such that the film formation of the resin of the first resin emulsion is insufficient, and it exists in the state of particles when water is evaporated, and the particles appear white due to the diffusion of light, but the temporary marking is At the time of erasing, film formation proceeds by applying heat at a temperature equal to or higher than the softening point of the resin in the first resin emulsion. As a result, the coating film becomes transparent, hard to be visually recognized by people, and is erased.

The heating temperature may be higher than or equal to the softening point of the resin in the first resin emulsion, but in order to shorten the working time and simplify the work, a temperature (higher than the softening point ( Specifically, it is preferable to heat at a temperature that is a digit different from the softening point, more preferably, a temperature that is two or more digits higher than the softening point).

There is no particular limitation on the method of applying heat to the temporary markings, and since a large amount of heat can be easily applied, a method of applying flames such as gas burners and flame radiators to the temporary markings to the extent that the coating film does not burn Alternatively, a method of applying warm air to the temporary marking by using a jet heater, a heat gun, or the like can be given.

(Method using organic solvent)
The erasing method using the organic solvent of the temporary marking of the present invention is characterized in that the temporary marking is sprayed with an organic solvent capable of dissolving the resin in the first resin emulsion contained in the used temporary marking paint. And In the method by heating, the resin in the first resin emulsion was melted and cured again to promote film formation and to make it transparent, but in the method using an organic solvent, the first directly by the organic solvent By dissolving the resin in the resin emulsion of and re-curing the resin emulsion, film formation is promoted to make it transparent.

The organic solvent used here is not particularly limited as long as it can dissolve the resin in the first resin emulsion, but examples thereof include aromatic solvents such as toluene and xylene, acetone, methyl ethyl ketone, Examples thereof include ketone-based solvents such as methyl isobutyl ketone and ester-based solvents such as ethyl acetate and butyl acetate.

As described above, the temporary marking paint or the temporary marking formed by the method of forming the temporary marking using the temporary marking can be easily erased by melting and removing with a flame such as a burner or by dissolving with an organic solvent. As a result, there is no risk of damage to the surface to be painted (for example, the road surface) due to the deletion of the temporary marking, and it becomes possible to remove the unnecessary temporary marking easily and in a short time.

The embodiment described above merely shows a typical form of the present invention, and the present invention is not limited to the embodiment. That is, those skilled in the art can carry out various modifications according to the conventionally known knowledge without departing from the gist of the present invention. As long as the coating composition for temporary marking of the present invention, and the method for forming a temporary marking using the same, and the method for erasing the temporary marking are provided by such a modification, it is of course included in the scope of the present invention. is there.

Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited to the following Examples. In the following description, “part” or “%” is based on mass unless otherwise specified.

[Preparation of temporary marking paint]
(Example 1)
The temporary marking paint of Example 1 was prepared with the composition shown in Table 1 below.
Specifically, 1.0 part by mass of the defoaming agent was added to 300 parts by mass of the rosin emulsion, and the mixture was stirred for 5 minutes with a disper to prepare the temporary marking paint of Example 1.

(Note 1) Arakawa Chemical Co., Ltd.: rosin emulsion (resin solid content 50.5%, softening point 100° C.)
(Note 2) Defoaming agent manufactured by Toray Dow Corning Co., Ltd.

(Example 2)
The temporary marking paint of Example 2 was prepared with the formulation shown in Table 2 below.
Specifically, 1.0 part by mass of a defoaming agent was added to 300 parts by mass of a petroleum resin emulsion, and the mixture was stirred with a disper for 5 minutes to prepare a temporary marking paint of Example 2.

(Note 3) Naruse Chemical Co., Ltd.: Petroleum resin emulsion (resin solid content 49%, softening point 70° C.)

(Example 3)
The temporary marking paint of Example 3 was prepared with the composition shown in Table 3 below.
Specifically, 35 parts by mass of the alkyd resin emulsion was added to 265 parts by mass of the rosin emulsion, and the mixture was stirred for 5 minutes using a disper. Then, 1.0 part by mass of an antifoaming agent was added to prepare the temporary marking paint of Example 3.

(Note 4) DIC Corporation: Alkyd resin emulsion (resin solid content 43%, MFT 20°C)

(Example 4)
The temporary marking paint (basic paint) of Example 4 was prepared with the composition shown in Table 4 below.
Specifically, 30 parts by mass of the acrylic emulsion was added to 270 parts by mass of the rosin emulsion, and the mixture was stirred with a disper for 5 minutes. Then, 1.0 part by mass of a defoaming agent was added to prepare the temporary marking paint of Example 4.

(Note 5) Dow Chemical Co., Ltd.: acrylic emulsion (resin solid content 50%, MFT 20° C.)

(Example 5)
In Example 4, except that the amount of the rosin emulsion was changed to 240 parts by mass and the amount of the acrylic emulsion was changed to 60 parts by mass, the temporary marking paint of Example 5 was prepared in the same manner as in Example 4. Prepared.

(Example 6)
In Example 4, except that the amount of the rosin emulsion was changed to 210 parts by mass and the amount of the acrylic emulsion was changed to 90 parts by mass, the temporary marking paint of Example 6 was prepared in the same manner as in Example 4. Prepared.

(Example 7)
In Example 4, except that the amount of the rosin emulsion was changed to 180 parts by mass and the amount of the acrylic emulsion was changed to 120 parts by mass, the temporary marking coating material of Example 7 was prepared in the same manner as in Example 4. Prepared.

(Example 8)
In Example 4, except that the amount of the rosin emulsion was changed to 150 parts by mass and the amount of the acrylic emulsion was changed to 150 parts by mass, the temporary marking paint of Example 8 was prepared in the same manner as in Example 4. Prepared.

(Example 9)
In Example 4, except that the amount of the rosin emulsion was changed to 120 parts by mass and the amount of the acrylic emulsion was changed to 180 parts by mass, the temporary marking paint of Example 9 was prepared in the same manner as in Example 4. Prepared.

(Example 10)
In Example 4, except that the amount of the rosin emulsion was changed to 90 parts by mass and the amount of the acrylic emulsion was changed to 210 parts by mass, the temporary marking coating material of Example 10 was prepared in the same manner as in Example 4. Prepared.

(Comparative Example 1)
In Example 4, except that the amount of the rosin emulsion was changed to 60 parts by mass and the amount of the acrylic emulsion was changed to 240 parts by mass, the temporary marking coating composition of Comparative Example 1 was prepared in the same manner as in Example 4. Prepared.

(Comparative example 2)
In Example 4, except that the amount of the rosin emulsion was changed to 30 parts by mass and the amount of the acrylic emulsion was changed to 270 parts by mass, the temporary marking coating composition of Comparative Example 2 was prepared in the same manner as in Example 4. Prepared.

(Comparative example 3)
The temporary marking paint of Comparative Example 3 was prepared in the same manner as in Example 4 except that the amount of the acrylic emulsion blended was changed to 300 parts by mass and no rosin emulsion was added.

[Evaluation test]
Various evaluation tests were conducted on the obtained temporary marking paints of Examples 1 to 10 and Comparative Examples 1 to 3. The results are summarized in Table 5 below. The evaluation test method is as follows.

<Evaluation test method>
1. Initial appearance A dense-grain asphalt block (300×300×50 mm) was used as a base material, and the temporary marking paints of Examples 1 to 10 and Comparative Examples 1 to 3 were respectively applied to one surface thereof with a roller at 180 g/m ^2. The coating state was confirmed after 24 hours. The evaluation criteria are as follows.
◯: The appearance of the coating film looks white △: What is seen through white ×: What looks transparent

2. Diffuse reflectance 1. Diffuse reflectance after 24 hours was measured using the test plate prepared in the initial appearance test. In the diffuse reflectance test, the measuring device used was a device defined by JIS Z 8722, and the tristimulus value Y value of the white paint coating film was measured. The evaluation criteria are as follows.
◯: Diffuse reflectance is 50 or more Δ: Less than 50, 20 or more x: Less than 20

3. Erasability (disappearance of coating color)
(1) Method by heating 1. A test plate prepared in the same manner as the initial appearance test was heated from the top of the coating film using a torch burner. At this time, the flame of the torch burner (estimated outer flame temperature: 1400° C.) was applied to the test plate, and the position where the flame was applied at a speed of 3 cm per second was moved. After that, 2. The diffuse reflectance was measured by the same method as the diffuse reflectance test. As an evaluation standard, a mark ◯ is given to a product that has a diffuse reflectance similar to that of the base material. Those that became transparent at the time of the initial appearance test and whose base was seen through were excluded from the test and marked with a minus sign.

(2) Method using organic solvent 1. An organic solvent in which acetone and toluene were mixed at a mass ratio of 3:1 was sprayed onto the coating film at a spraying rate of 50 g/m ² on a test plate prepared in the same manner as the initial appearance test. After the sprayed organic solvent is dried, 2. The diffuse reflectance was measured by the same method as the diffuse reflectance test. As an evaluation standard, a mark with a circle was obtained when a diffuse reflectance similar to that of the substrate was obtained. Those that became transparent at the time of the test of the initial appearance and whose base was seen through were excluded from the test and marked with a minus sign.

4. Durability test The temporary marking paints of Examples 1 to 10 and Comparative Examples 1 to 3 were respectively applied to one side of an asphalt block (180 x 180 x 30 mm) defined in JIS K 5600-1-4 5.14. And a coating amount of 100 g/m ² using a roller, and dried for 2 hours. Then, using a cleaning test device and a brush defined in JIS K5660-7.13 (cleaning resistance), a brush was applied to the coating film of this test plate in a dry state, and reciprocated 20 times.

The state of the coating film after the test was visually confirmed and evaluated. The evaluation criteria are as follows.
◯: No abnormality in the coating film Δ: Residual area ratio of the coating film is 70% or more ×: Residual area ratio of the coating film is less than 70%

The temporary marking paint of the present invention can also be used as a temporary paint for objects to be painted other than the road surface, for example, the inner and outer wall surfaces of a building or the roof. In that case, the object to be coated can be painted by the method of forming the temporary marking of the present invention, and the temporary marking can be deleted by the method of deleting the temporary marking of the present invention. Of course, all of these are also included in the category of the present invention.

Claims (7)

A paint for temporary marking, which comprises, as a coating film forming component, at least a first resin emulsion, which is an emulsion of a resin having a softening point of 60° C. or higher, in a solid content ratio of 25% by mass or more. The first resin emulsion is at least one resin emulsion selected from the group consisting of rosin-modified resin emulsion, petroleum resin emulsion, coumarone-indene resin emulsion, and terpene-modified phenol resin emulsion. The temporary marking paint described in. The temporary marking paint according to claim 1 or 2, which comprises, as a coating film forming component, a second resin emulsion which is an emulsion of a resin having a minimum film forming temperature of 50°C or lower. The temporary marking paint according to claim 3, wherein the second resin emulsion is at least one resin emulsion selected from the group consisting of an acrylic resin emulsion, an alkyd resin emulsion, and a vinyl acetate resin emulsion. .. The temporary marking coating composition according to any one of claims 1 to 4, which is applied to the surface to be coated at a temperature lower than the softening point of the resin in the first resin emulsion contained therein. How to make a sign. Applying heat to the temporary marking formed by the method for forming a temporary marking according to claim 5 at a temperature not lower than the softening point of the resin in the first resin emulsion contained in the temporary marking coating used. Then, a method of erasing the temporary marking, characterized by erasing the temporary marking. By applying an organic solvent capable of dissolving the resin in the first resin emulsion contained in the used temporary marking paint to the temporary marking formed by the method for forming a temporary marking according to claim 5. A method for erasing the temporary marking, characterized by erasing the temporary marking.