JP2005288206A - Retroreflective coating film and its forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retroreflective coating film imparting retroreflectiveness to various substrates and having high retroreflectiveness, and its forming method. <P>SOLUTION: The retroreflective coating film can be provided, with a reflective film formed in a part of beads for expressing retroreflectiveness, the film being formed with its bottom part on the lower part in the coating film, having high retroreflectiveness, and applicable to a wide range of substrates. In this forming method, a substance having high affinity with a primary coating film is adhered to the reflection film part of of the beads. Further, a substance with high affinity with translucent paint is adhered to the bead upper part of non-reflection film part, or the reflection film is made of a magnetic metal, or a magnetic metal is adhered. At coating time, or after coating, magnet is placed on the substrate side, to attract the magnetic metal of the reflection film of the beads to the substrate direction, thus the reflection film can be provided with its beads reflection film arranged at the lower part, between the primary and translucent coating films. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a coating film having high retroreflectivity and a method for forming the same.

  Those having retroreflectivity include, for example, sheet-like materials, coating films, resin moldings, etc., which are used for road signs, guide signs, visual guidance signs, etc. around roads, and structures around roads. It plays an important role in alerting drivers and safety measures for pedestrians.

  Sheet-like materials are generally widely used as reflective sheets, have high reflection brightness, and need only be attached to the sheet. It is suitably used for signs and guide signs.

  What consists of a resin molding is mainly prism-shaped, and is formed by injection molding or the like. These have very high retroreflective properties, and are used for retroreflectors such as a line-of-sight guide.

In addition, the coating film having retroreflectivity is formed by spraying a paint mixed with a retroreflective material such as glass beads, and the shape and size of the base material that imparts retroreflective properties. Since there are few restrictions, it can be applied to various places.

Japanese Patent Laid-Open No. 7-24988 JP 7-295487 A

  However, since the coating-like retroreflective film is formed by directly spraying a coating material containing glass beads as a reflective material, the direction in which the beads adhere to the coating film has a drawback in that it is not constant. For this reason, the beads are not provided with a reflective film, and have a disadvantage that the reflection performance is low. This reflective film is formed on a part of the surface of the bottom of the bead, and light incident on the bead exhibits high retroreflectivity by reflecting light with the reflective film as a focal point.

  Since such a reflective film is not provided, the retroreflectivity of the glass beads depends on the reflectivity at the interface between the beads and the coating film. Therefore, the retroreflectivity changes depending on the color of the underlying coating film.

  In addition, paint beads are easily generated on the glass beads, and the light does not reach the glass beads, so that the retroreflectivity is not exhibited.

  Therefore, the present invention has been made in view of the problems as described above, and can provide retroreflective properties to various substrates by forming a retroreflective coating film by spraying a paint containing glass beads, and The present invention provides a retroreflective coating film having a high retroreflective property and a method for forming the same.

  In order to achieve the above object, the present invention is configured as follows. That is, a retroreflective bead in which a reflective film having light reflectivity is provided on the surface of at least a part of a bead made of glass or resin, and the retroreflective bead is formed by painting a paint. The coating film is provided with the reflective film as the bottom surface.

  The bead for exhibiting retroreflectiveness should have a reflective film formed on a part thereof, and the reflective film should have a bottom portion in the coating film. . The reflective film is formed on a part of the bead surface, and light that has entered the bead exhibits high retroreflectivity by reflecting light with the reflective film as a focal point. By doing so, it is possible to provide a retroreflective film by coating that can be applied to a wide range of substrates, and having a high retroreflective property.

  Moreover, since the reflection luminance is improved and the amount of beads can be reduced by setting the reflective film portion as the bottom, the cost can be reduced and the amount of beads in the paint can be reduced. Therefore, workability is also improved.

  Conventionally, there is no reflective film of beads, and the interface between the undercoat coating film and the beads played the role of a reflective film, so that the retroreflectivity was changed depending on the color of the undercoat paint film. In the present invention, since the reflective film is provided on the beads, the reflective performance can be expressed without changing the retroreflectivity by the undercoat coating film.

  In addition, the anti-sticking performance can be expressed on the film surface by the unevenness of the beads.

  The coating film is composed of at least two layers, and has a coating film in which at least a part of the retroreflective beads is embedded, and a translucent coating film provided so as to cover the retroreflective beads on the coating film. It is characterized by this.

  The coating film is preferably composed of at least two layers, and beads are arranged at this interface. In other words, a part of the beads are embedded in the lower coating and fixed to the coating, and a transparent translucent coating is provided on the beads, so that the retroreflectivity is not impaired. Dropout can be suitably prevented. At this time, the portion embedded in the lower coating film may be a reflective film portion provided on the beads.

  Also, a method for forming a retroreflective coating film, which comprises translucent beads containing retroreflective beads made of glass or resin in a state where the undercoat coating film has fluidity after the base coating film is applied to a substrate. A retroreflective coating film containing beads is formed by coating a paint on the undercoat coating film, and the retroreflective beads are provided with a reflective film having light reflectivity on the surface of at least a part of the beads, A substance having an affinity for the undercoat film is attached to the surface of the reflective film part, and a substance having an affinity for the light-transmitting paint is attached to the surface other than the reflective film, whereby the undercoat film The retroreflective beads are arranged with the reflective surface on the bottom surface between the film and the translucent coating film.

  After forming the undercoat film, a translucent paint containing beads is applied onto the undercoat film while the undercoat film has fluidity. A reflective film portion is provided on at least a part of the beads, and a substance having a high affinity with the undercoat film is attached to the reflective film portion. Keep high substances attached. In this way, when a light-transmitting paint containing beads is applied, the reflective film part of the beads is attracted to the undercoat film, and the reflective film part can be embedded in the undercoat film. Beads can be arranged between the coating film and the translucent coating film so that the reflective film faces downward.

  Also, a method for forming a retroreflective coating film, which comprises translucent beads containing retroreflective beads made of glass or resin in a state where the undercoat coating film has fluidity after the base coating film is applied to a substrate. A retroreflective bead formed by coating a paint on the undercoat and the light-reflective bead included in the translucent coat has a light-reflective reflecting film made of a magnetic metal on at least a part of the surface of the bead. The retroreflective beads are arranged with the reflecting surface on the lower surface between the undercoat coating film and the translucent coating film by bringing the magnet closer from the base material side during and / or after painting. It is characterized by this.

  As another method for forming the retroreflective coating film, the following method can also be suitably used. After forming the undercoat film, a translucent paint containing beads is applied onto the undercoat film while the undercoat film has fluidity. A reflection film portion is provided on at least a part of the beads, and the reflection film is made of a magnetic metal or attached with a magnetic metal. Then, a magnet can be installed on the substrate side during or after the coating, and the magnetic metal of the reflective film of the beads can be attracted toward the base material by magnetic force so that the bead reflective film is oriented in such a direction as to come to the bottom. When the magnet is placed, if the base material is a magnetic metal body, the base material itself may be attached as a magnet or an electromagnet, or a magnet may be placed on the back side of the base material.

  By forming the retroreflective coating film in this way, it is possible to obtain a highly retroreflective coating film in which the reflective film surface of the beads is oriented at the bottom.

  According to the present invention, a reflective film is formed on a part of a bead for exhibiting retroreflective properties, and the reflective film is formed so that its bottom portion is on the lower side in the coating film to exhibit retroreflective properties. To do. By doing so, it is possible to provide a retroreflective film by coating that can be applied to a wide range of substrates, and having a high retroreflective property.

  In addition, the coating film is composed of at least two layers. When a part of the beads are embedded in the lower coating film and fixed to the coating film, a transparent translucent coating film is provided on the beads. Well, it is possible to suitably prevent the beads from dropping without impairing the retroreflectivity.

  Further, in the method of forming a retroreflective coating film as described above, after forming the undercoat film, a translucent paint containing beads is formed on the undercoat film while the undercoat film has fluidity. Apply a reflective film part to at least a part of the bead, attach a substance having a high affinity with the undercoat film to the reflective film part, and apply a translucent paint on the upper part of the bead that is not the reflective film part. If a substance with high affinity is attached, when a translucent paint containing beads is applied, the reflective film part of the beads is attracted to the undercoat film, and the reflective film part is embedded in the undercoat film. In addition, a bead reflective film may be arranged between the undercoat coating film and the light-transmitting coating film with the reflective film facing down.

  In addition, as another method of forming a retroreflective coating film, after forming an undercoat film, a translucent paint containing beads is applied on the undercoat film while the undercoat film has fluidity, At least a part of this bead is provided with a reflective film part, and this reflective film is made of a magnetic metal or attached with a magnetic metal, and a magnet is placed on the substrate side at the time of painting or after painting to reflect the bead by magnetic force. The magnetic metal of the film may be drawn in the direction of the substrate, and the bead reflection film may be oriented in such a direction as to come to the bottom.

  Embodiments according to the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic view showing a cross section of the retroreflective coating film of the present invention. An undercoat coating 2 is applied on the substrate 1 and a light-transmitting coating 3 is formed thereon. Beads 4 having retroreflectivity are provided at the interface between the undercoat coating film 2 and the translucent coating film 3. The retroreflective beads are arranged so that a reflective film is formed on a part thereof and the reflective film portion 41 is the bottom.

  Thus, the reflective film part is provided in the bead in a coating film, and since the reflective film part 41 is made into the bottom part, high retroreflectivity can be expressed. Moreover, since the reflective film is formed, stable reflective performance can be expressed without changing the reflective performance depending on the color of the coating film. In other words, if the coating film is too dark, sufficient reflective performance was not obtained and the coating film color was limited, but according to the present invention, the color of the coating film is not limited, Retroreflectivity can be imparted to the desired coating color.

  Further, since a part of the beads are embedded and fixed in the undercoat coating film and a translucent coating film is formed from above, the beads are firmly held in the coating film and do not fall off. Further, by encapsulating the beads in the coating film, unevenness is formed on the surface of the coating film, and this unevenness can also exert a function to prevent sticking of a tape or glue.

  In FIG. 2, the schematic diagram which showed the expression mechanism of the retroreflection property of a retroreflection coating film is shown. Through the translucent coating film, the incident light E enters the bead and is reflected with the reflective film portion 41 as a focal point, and the reflected light R returns to the direction in which the light is incident (retroreflection).

  The beads used at this time are not particularly limited as long as they have retroreflective properties, and glass beads and resin beads such as acrylic resins can also be used.

  Next, an example of a method for forming the retroreflective coating film of the present invention will be specifically described. First, an undercoat coating film 2 is formed on the substrate 1. Then, while the undercoating film has fluidity, a translucent coating material containing beads is applied from above to form a translucent coating film. A reflection film portion 41 is formed in advance on a part of the bead 4, and a substance having a high affinity with the undercoat is adhered to the surface of the reflection film portion, and a reflection film on the bead surface is formed. A substance having high affinity with the light-transmitting coating film that is the top coat film is adhered to the uncoated portion. By applying such a light-transmitting paint containing beads while the undercoat film has fluidity, the beads move to the interface between the undercoat film and the light-transmitting film, and the reflective film portion is undercoated. Arrange them so that they are at the bottom of the beads so that they are embedded in the coating.

  At this time, the kind of the undercoat coating film or the translucent coating film is not particularly limited as long as it corresponds to a substance having affinity for each coating film to be attached to the beads. A combination of a substance and a coating film that has an affinity for each coating film to be attached to the beads uses, for example, a hydrophilic coating as an undercoat coating, and has an affinity with the coating, and adheres to the reflective film. As the substance to be formed, an aluminum vapor-deposited film may be used, and the transparent coating film of the top coat is a hydrophobic paint, and iron stearate is preferably attached as a substance to be attached to the surface other than the reflective film of the beads. Iron stearate is a substance that reacts with glass and exhibits hydrophobicity.

    Next, another example of the method for forming the retroreflective coating film of the present invention will be specifically described. First, an undercoat coating film 2 is formed on the substrate 1. Then, while the undercoating film has fluidity, a translucent coating material containing beads is applied from above to form a translucent coating film. The reflective film portion 41 of the bead 4 is previously formed of a metal having magnetism, or has a metal having magnetism attached thereto. By applying a translucent paint containing such beads while the undercoating film has fluidity and placing a magnet on the substrate side, and attracting the magnetic material on the surface of the bead by magnetic force, It moves to the interface with the light-transmitting coating film, and can be arranged so that it comes to the bottom of the beads so that the reflective film portion is embedded in the undercoat coating film.

  At this time, the magnetic material to be used is not particularly limited, and for example, iron or platinum can be used. In addition, the magnet provided on the base material side may be installed on the back side of the base material, and if the base material itself is a magnetic body, the magnet is brought into contact with the base material to impart magnetism to the base material itself. May be.

  The coating film shown above can be formed, for example, on the periphery of the road to improve the visibility of drivers and pedestrians and improve safety. Specifically, for example, the present invention can be applied to various things such as a fence post, a beam, a sign post, a car stop, and a signboard.

It is a schematic diagram of the cross section which shows an example of implementation of this invention. It is a schematic diagram which shows incidence | injection of the light of this invention.

Explanation of symbols

E incident light R reflected light 1 base material 2 undercoat paint 3 translucent paint 4 retroreflective bead 41 reflective film

Claims (4)

A retroreflective bead in which a reflective film having light reflectivity is provided on the surface of at least a part of a glass or resin bead, wherein the retroreflective bead is formed by coating a paint. A retroreflective coating film characterized by being provided with a reflective film on the inside. The coating film comprises at least two layers, and has a coating film in which at least a part of the retroreflective beads is embedded, and a translucent coating film provided so as to cover the retroreflective beads on the coating film. The retroreflective coating film according to claim 1, wherein the film is a retroreflective coating film. A method for forming a retroreflective coating film according to claim 1 or 2, wherein the undercoat coating film exhibits fluidity after the base coat film is applied to a substrate. A retroreflective coating film containing beads is formed by coating a light-transmitting paint containing retroreflective beads made of glass or resin on the undercoat film, and the retroreflective beads include at least beads. A reflective film having light reflectivity is provided on a part of the surface, a substance having an affinity for the undercoat film is attached to the surface of the reflective film part, and a light-transmitting paint is applied to the surface other than the reflective film. The retroreflective coating is characterized in that retroreflective beads are arranged with the reflective surface on the bottom surface between the undercoat film and the translucent coating film by attaching a substance having affinity for Method for forming a film. 3. The method of forming a retroreflective coating film according to claim 1 or 2, wherein after the undercoat coating film is applied to a substrate, the retroreflective beads made of glass or resin in a state where the undercoat coating film has fluidity. A light-reflective coating made of a magnetic metal is formed on at least a part of the surface of the retroreflective beads formed in the light-transmitting coating film. A reflective film having a reflective property is provided, and a retroreflective bead is reflected between the undercoat film and the translucent film by bringing a magnet close to the base material side during and / or after coating. A method for forming a retroreflective coating film, characterized in that the layers are arranged on the bottom surface.

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