JP5711866B2 - Self-cleaning road incidental facilities - Google Patents

Description

  The present invention is a self-cleaning road incidental facility in which a contaminant that adheres to the outer surface is washed away relatively easily by rainwater and the surface is kept clean by forming a self-cleaning, colorless and transparent coating layer on the outer surface. It is about.

  A self-cleaning, colorless and transparent coating layer is formed on the outer surface of the road incidental facilities, and the contaminants attached to the outer surface are maintained while maintaining the transparency of the road incidental facilities and the surface color, symbols, patterns, etc. As a self-cleaning road ancillary equipment in which the surface is relatively easily washed away by rainwater etc. and the surface is kept clean, for example, the surface of a sound insulating wall of a road or railway is covered with a semiconductor photocatalyst containing layer, The photocatalyst particles are formed of dispersed silicone, and the surface of the photocatalyst-containing layer is formed of a silicone derivative in which an organic group bonded to a silicon atom of a silicone molecule is at least partially substituted with a hydroxyl group by the action of the photocatalyst. The surface of the layer is hydrophilized as the photocatalyst is photoexcited by sunlight, and hydrophobic contaminants adhere to the surface of the sound insulation wall. Locked, or the sound insulating wall is road or railway sound insulating wall of dirt attached to the surface of the sound insulating wall is adapted to be washed away by rain water is disclosed when exposed to rain (e.g. Patent Document 1).

  On the other hand, as a transparent coating composition, a fluoroolefin-vinyl ether system having a fluorine content of 10% by weight or more based on fluoroolefin units and an intrinsic viscosity measured in tetrahydrofuran of 0.05 to 2.0 dl / g. A coating composition for synthetic resin having low solvent resistance, including a copolymer and a solvent containing 20% by weight or more of cyclohexanone is disclosed (for example, Patent Document 2).

Japanese Patent No. 3124491 Japanese Patent No. 2613202

  However, in the conventional self-cleaning road ancillary equipment as described in Patent Document 1, since the photocatalyst containing layer is formed on the outer surface, when the contained photocatalyst is irradiated with light and activated, the road ancillary equipment is When it is formed from a substance that is decomposed by the oxidation action of a photocatalyst such as a synthetic resin, it is necessary to provide a protective layer between the photocatalyst containing layer and the road incidental equipment, and the process involved in the formation is complicated. there were.

  In addition, when a transparent coating composition as described in Patent Document 2 is used, it is possible to perform coating by one coat and one bake, and although the process relating to the formation can be simplified, the road incidental equipment itself is a polycarbonate resin. If the surface of the road ancillary equipment is made of a material with low solvent resistance, such as a coating film made of synthetic resin on the outside of the road ancillary equipment, the base is eroded by the solvent and the road ancillary The transparency that the equipment should have and the color tone, symbols, patterns, etc. of the surface that should be seen through the coating layer may be impaired.

  The present invention has been made in view of the problems as described above, and it is possible to simplify the process related to the formation of the coating layer while expressing self-cleaning properties over a long period of time, and the surface of the road incidental equipment is solvent resistant. It is intended to provide a self-cleaning road incidental facility in which a coating layer is formed without hindrance even if it is low.

In order to achieve the above object, the present invention is configured as follows. That is, in the self-cleaning road incidental facility according to the present invention, a transparent coating layer is formed on the outer surface of the road incidental facility, and the coating layer is a coating composition containing a hydroxyl group-containing fluororesin composition and an isocyanate curing agent. A clear coating composition containing 0.01 to 1.0 part by weight of a fluorosurfactant, 1 to 15 parts by weight of an ultraviolet absorber, and 1 to 30 parts by weight of an organosilicate compound per 100 parts by weight of resin solids. And the covering layer is a self-cleaning road auxiliary facility formed on the outer surface of the road auxiliary facility through a primer layer formed using a urethane-modified acrylic primer, and the self-cleaning Ancillary road ancillary equipment is a road having a base portion and a pole portion made of a polyurethane-based resin having a flexibility protruding upward from the base portion. A識柱, material further wherein said primer layer on the outer surface of the pole portion using a urethane-modified acrylic primer is formed and, in the upper of the pole portion, the surface from the top of the primer layer having an active hydrogen The reflective sheet formed from is wound, and the coating layer is directly formed on the outer surface of the primer layer including the outer surface of the reflective sheet.

  According to the self-cleaning road incidental equipment according to the present invention, the adhesion and high transparency can be maintained even if the coating layer is exposed to the outdoors for a long time, but the coating layer is formed by one coat and one bake on the outer surface of the road auxiliary equipment. It is possible to simplify the process related to the formation, and even if it is formed on the outer surface of the road auxiliary equipment having low solvent resistance, the surface is hardly damaged by the solvent, and the coating layer can be formed on the outer surface without any trouble. it can.

Further, the self-cleaning road incidental equipment according to the present invention includes, in addition to the above configuration, the road auxiliary equipment, a base portion, and a polyurethane resin-made pole portion having a flexibility projecting upward from the base portion. The primer layer is formed using a urethane-modified acrylic primer on the outer surface of the pole portion, and the covering layer is formed on the outer surface of the primer layer. Is.

  In addition, if the covering layer is formed on the outer surface of the pole part and the outer surface of the reflection sheet attached to the pole part, in addition to the outer surface of the pole part, there is a problem that visibility is deteriorated due to adhesion of contaminants. In a reflective sheet that is often seen, even if the outer surface has low solvent resistance, the outer surface is not affected when the coating layer is formed, and the outer surface of the reflective sheet is provided with self-cleaning properties without impairing retroreflectivity. Can be preferable.

  According to the self-cleaning road incidental equipment according to the present invention, the adhesion and high transparency can be maintained even if the coating layer is exposed to the outdoors for a long time, but the coating layer is formed by one coat and one bake on the outer surface of the road auxiliary equipment. It is possible to simplify the process related to the formation, and even if it is formed on the outer surface of the road auxiliary equipment having low solvent resistance, the surface is hardly damaged by the solvent, and the coating layer can be formed on the outer surface without any trouble. it can.

  BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment according to the present invention will be specifically described below based on the drawings.

  FIG. 1 shows a first embodiment of a self-cleaning road incidental facility according to the present invention, in which (a) is a perspective view showing the whole, and (b) is a longitudinal sectional view showing details of an outer surface. First, in (a), the road incidental facility is a road sign pillar 1A, and the road sign pillar 1A is formed of a base part 1A2 fixed to the ground surface and a pole part 1A1 protruding upward from the base part 1A2. The reflection sheet 1A3 is wound over the pole portion 1A1 in three upper and lower stages. The pole portion 1A1 and the base portion 1A2 are made of polyurethane resin, and the pole portion 1A1 can be bent and restored by a vehicle collision or the like. Such a road sign pillar 1A generally has a pole portion 1A1 that has a vivid color tone of orange or green to enhance the attractiveness in the daytime, and is retroreflected when a vehicle headlamp or the like is irradiated by the reflective sheet 1A3. The road sign post 1A is generally provided along the side edge of the road, such as soot from the exhaust gas of automobiles, dust around the road, etc. Contaminants may adhere and the above-described attractiveness and visibility may be impaired.

  In (b), a two-component thermosetting urethane-modified acrylic primer layer 3A is formed on the outer surface of the pole portion 1A1, and a hydroxyl group-containing fluororesin composition and an isocyanate-based curing agent are further formed on the outer surface of the primer layer 3A. The coating composition contains 0.01 to 1.0 parts by weight of a fluorosurfactant, 1 to 15 parts by weight of an ultraviolet absorber, and 1 to 30 parts by weight of an organosilicate compound per 100 parts by weight of the resin solid content. The coating layer 2 is formed with a layer thickness of 20 μm using the clear coating composition thus prepared. By the organosilicate compound contained in the coating layer 2, hydrophilicity is expressed on the surface of the coating layer 2, and soot and dust adhering to the outer surface of the pole part 1 </ b> A <b> 1 are easily washed away by rainwater being poured. The surface is kept clean. The coating thickness of the coating layer 2 may be an appropriate film thickness that can sufficiently exhibit the antifouling performance and does not impair the transparency, but is about 5 to 50 μm, more preferably 10 It is preferable to set the thickness to about 30 μm.

  The reflective sheet 1A3 attached to the outer surface of the pole 1A1 is attached via a primer layer 3A. In general, the reflection sheet 1A3 has low adhesion to the polyurethane-based resin, and is adhered through a primer layer to ensure adhesion. On the other hand, the coating layer 2 alone is necessary and sufficient for the pole portion 1A1. Even if good adhesion is obtained, since the pole portion 1A1 is a flexible polyurethane resin, there is a possibility that the coating layer 2 may crack due to deformation of the pole portion 1A1. The primer layer 3A is formed on the entire pole portion 1A1, the coating layer 2 is formed on the primer layer 3A, and the reflection sheet 1A3 is adhered, so that the adhesion of the reflection sheet 1A3 is ensured and the coating layer 2 can improve the adhesion by interposing the primer layer 3A and reduce the possibility of cracking, etc., but when the primer layer 3A is formed on the outer surface of the pole portion 1A1, only the sticking portion of the reflective sheet 1A3 is applied. There is no need to separate them, and a primer can be applied to the entire outer surface of the pole portion 1A1 to further simplify the process.

The primers for forming the primer layer 3A on the outer surface of the pole portion 1A1, possible to heighten the durability followability can be obtained for the urethane-modified acrylic-based primer by using the high adhesion and the pole portion 1A1 Can do.

  Further, the same coating layer 2 may be provided on the surface of the reflection sheet 1A3. As shown in (c), the reflective sheet 1A3 is formed by providing a cover 1A32 on the glass bead reflector 1A31, and is adhered to the pole 1A1 by the adhesive layer 1A33 via the primer layer 3A. By providing the cover layer 2 with a thickness of about 20 μm on the surface of the cover 1A32, hydrophilicity is expressed on the surface of the cover layer 2 by the organosilicate compound contained in the cover layer 2, and the outer surface of the pole portion 1A1 The dust, dust, etc. adhering to the surface are easily washed away when rainwater or the like is poured, so that the surface is kept clean. The covering layer 2 may be formed after applying a primer in the same manner as the pole portion 1A1, but when the surface of the cover 1A32 is formed of a material having active hydrogen such as polyolefin resin. Even if the clear coating composition is directly applied to the cover 1A32 on the surface of the reflective sheet 1A3, the coating layer 2 can be formed with high adhesion.

  2A and 2B show a second embodiment of the self-cleaning road incidental equipment according to the present invention, wherein FIG. 2A is a perspective view showing the whole, and FIG. 2B is a cross-sectional view showing details of a cross section. First, in (a), the road incidental facility is a protective fence 1B, which is formed by attaching a vertical lattice panel 1B2 formed by welding pipes between columns 1B1 erected at intervals on the ground surface. Is. The struts 1B1 and the vertical lattice panel 1B2 are coated on the outer surface of a galvanized steel pipe using a polyester resin powder paint. Paints are generally used in places with high lightness, such as white, in places where it is necessary to increase the attractiveness, and in places where it is necessary to consider the surrounding landscape, such as in urban areas, the brightness is low, such as dark brown Colored ones are often used. However, these protective fences 1B are often installed around the road, and as in the case of the road sign post 1A, pollutants such as soot and dust from the exhaust gas of automobiles and dust around the road are attached. There is a risk that the above-described attractiveness and scenery may be impaired.

  Next, (b) is a cross-sectional view of the vertical grid portion of the vertical grid panel 1B2 of (a), and the outer surface of the galvanized steel pipe 1B3 is coated with a polyester resin powder coating with a thickness of 80 to 100 μm. A layer 3B is formed, and a coating layer 2 having a thickness of 20 μm is formed on the outer surface of the coating layer 3B using the same clear coating composition as in the first embodiment. The polyester resin has a relatively low solvent resistance, but the coating layer 2 according to the present invention does not attack the polyester resin, and does not impair the color tone and design that should be expressed by painting. The color tone of 1B is made visible through the coating layer 2. Further, the coating layer 2 exhibits hydrophilicity on the outer surface, so that contaminants attached to the outer surface can be easily washed away by rainwater or the like. The covering layer 2 may be formed only on the vertical lattice panel 1B2 where the degree of attractiveness and scenery due to the adhesion of contaminants is large, or it is also formed on the support column 1B1 to express self-cleaning in the entire protective fence 1B. You may do it.

  FIG. 3 shows a third embodiment of the self-cleaning road incidental equipment according to the present invention, in which (a) is a perspective view showing the whole, and (b) is a cross-sectional view showing details of a cross section. As shown in (a), the road incidental facility is a balustrade 1C, which is formed by passing a cross beam 1C2 between pillars 1C1 erected from the ground surface at intervals like the guard fence 1B. Painted with polyester resin powder paint. As in the above-described embodiment, the railing 1C is often installed around the road, and pollutants such as soot and dust from the exhaust gas of automobiles adhere to the road, and the above-described attractiveness and landscape However, if the covering layer 2 is formed on the outer surface of the support column 1C1 or the cross beam 1C2, the contaminants that are hydrophilic on the outer surface and adhere to the outer surface are poured into the rainwater. It is designed to be easily washed away. As shown in (b), by providing the coating layer 2 on the outer surface of the coating layer 3B formed on the cross beam 1C2, the organo contained in the coating layer 2 without impairing the color tone or design of the coating layer 3B. By the silicate compound, hydrophilicity is expressed on the surface of the coating layer 2, so that dust, dust, and the like adhering to the outer surface of the cross beam 1C2 are easily washed away by rainwater and the surface is kept clean. To be made.

  The coating to which the coating layer according to the present invention is applied is not limited to polyester resin powder paints, and can be applied regardless of solvent type or powder type, fluororesin type coating, epoxy resin type It can be used for painting, urethane resin coating, acrylic resin coating, and the like.

  FIG. 4: shows 4th embodiment of the self-cleaning road incidental equipment concerning this invention, (a) is a perspective view which shows the whole, (b) is sectional drawing which shows the detail of a cross section. In (a), the road incidental facility is a line-of-sight guide 1D installed at an appropriate interval on the side edge of the road, and the line-of-sight guide 1D is connected to the guide specimen 1D3 attached to the upper end of the column 1D2 with a prism reflector. The retroreflector 1D1 is embedded and formed. When the contaminants adhere to the retroreflector 1D1, the performance of the visual guidance indicator 1D is significantly impaired as a result of the retroreflecting of the vehicle headlamp. In order to remove such adhering contaminants, conventionally, a wiper rotating by wind pressure or a photocatalyst containing layer was provided, but in the former, the wiper was damaged or the wiper or the retroreflector was worn. Concerned about the latter, the cost associated with formation was difficult.

  In (b), a primer layer 3E is formed on the outer surface of a transparent polycarbonate resin cover 1D12 that covers the prism reflector 1D11 of the retroreflector 1D1, and the cover layer 2 is 20 μm on the cover 1D12 via the primer layer 3E. It is provided with a film thickness. The coating layer 2 is the same as that shown in the first embodiment, and the primer layer 3E can be the same as that shown in the first embodiment. Further, as shown in the fourth embodiment, the cover layer 2 may be directly formed after the cover 1D12 is subjected to UV treatment or the like. By providing such a coating layer 2, hydrophilicity is expressed on the surface of the coating layer 2 by the organosilicate compound contained in the coating layer 2, so that dust, dust, etc. adhering to the outer surface of the retroreflector 1D1 are rainwater, etc. By being poured, it becomes easy to be washed away, the surface is kept clean and the light transmission is maintained, and the gaze-inducing effect can be maintained. Further, the coating layer 2 can provide hydrophilicity at a lower cost than the provision of the photocatalyst-containing layer without worrying about wear of the retroreflector 1D1 and the like.

  FIG. 5 is a sectional view showing a film applied to a self-cleaning road incidental facility according to the present invention. The film 1E is formed by providing a coating layer 2 directly on one surface of a base material 1E1 made of a transparent polyolefin-based synthetic resin, and a transparent adhesive layer 1E2 is provided on the other surface so that the whole is transparent. It was made. The coating layer 2 is formed by directly applying the same clear coating composition as in the first embodiment to the surface of the substrate 1E1, and the film thickness of the coating layer 2 is about 20 μm. Adhering such film 1E to the sign surface of the sign plate, the light-transmitting sound insulation wall, the display surface of the sign, the roof surface of the shelter, etc. using the adhesive layer 1E2 may impair the function of the existing road incidental facilities. The coating layer 2 is easily formed on the outer surface, and hydrophilicity is expressed on the surface of the coating layer 2 by the organosilicate compound contained in the coating layer 2, and soot and dust adhering to the outer surface of the film 1E It is easy to be washed away by pouring etc., and the surface can be kept clean.

  The excellent performance of the self-cleaning road incidental equipment according to the present invention will be described below with reference to examples.

Example 1
17 parts by weight of a fluoroolefin-vinyl ether copolymer as a hydroxyl group-containing fluororesin, 3.5 parts by weight of Coronate HX (manufactured by Nippon Polyurethane Industry) as an isocyanate curing agent, 12 parts by weight of cyclohexanone, 39 parts by weight of diisobutyl ketone And was dissolved uniformly in a solvent containing 28.5 parts by weight of methyl isobutyl ketone. Furthermore, 0.01 part by weight of EFKA-3034 (manufactured by EFKA) as a fluorosurfactant, 1.7 parts by weight of Tinuvin 400 (manufactured by Ciba Specialty Chemicals) as a triazine-based UV absorber, an organosilicate compound As a coating composition, MKC silicate MS58B30 was added in an amount of 1.5 parts by weight, and ammonia monoacetylacetonate biz (ethyl acetoacetate) (manufactured by Kawaken Fine Chemical Co., Ltd.) was added as a catalyst in an amount of 0.15 parts by weight. Using this coating composition, a coating layer having a thickness of 20 μm is formed on the pole portion (outer diameter φ80) of the road sign pillar shown in FIG. 1 to obtain the self-cleaning road incidental equipment of Example 1 according to the present invention. It was.

(Example 2)
The present invention is the same as Example 1 except that the road sign post is replaced with a protective fence and a coating layer having a thickness of 20 μm is formed on a protective fence column (φ60.5) coated with polyester powder. A self-cleaning road incidental facility according to Example 2 was obtained.

(Comparative Example 1)
The self-cleaning road of Comparative Example 1 was the same as Example 1 except that polyester-modified polydimethylsiloxane (BYK) was used as the silicone surfactant instead of the fluorine surfactant as the surfactant. Ancillary equipment was obtained.

  About the self-cleaning road ancillary equipment shown in the Examples and Comparative Examples, the appearance after coating and the contact angle with water after accelerated weathering test (according to Sunshine Carbon Arc Light Weathering Tester (made by Suga Test Instruments Co., Ltd.)) Was measured. The results are shown in Table 1.

  In Examples 1 and 2, the appearance after coating was smooth and transparent, and the contact angle with water was 35 ° or less even after the accelerated weather resistance test, indicating good hydrophilicity. It is clearly shown that is expressed and self-cleaning is exhibited. On the other hand, in Comparative Example 1, the appearance after coating is slightly cloudy and the transparency is lowered, and the contact angle with water after the accelerated weathering test is 70 ° or more, and self-cleaning is exhibited. It is clearly shown that the possibility is small.

It is explanatory drawing which shows 1st embodiment of the self-cleaning road incidental equipment concerning this invention. It is explanatory drawing which shows 2nd embodiment of the self-cleaning road incidental equipment concerning this invention. It is explanatory drawing which shows 3rd embodiment of the self-cleaning road incidental equipment concerning this invention. It is explanatory drawing which shows 4th embodiment of the self-cleaning road incidental equipment concerning this invention. It is sectional drawing which shows the film applied to the self-cleaning road incidental equipment concerning this invention.

Explanation of symbols

1A Road incidental facilities (road sign pillars)
1B Road incidental equipment (protective fence)
1C Road incidental facilities (handrail)
1D Road incidental equipment (Gaze guidance mark)
2 Coating layer 3 Primer layer

Claims (1)

A transparent coating layer is formed on the outer surface of a road ancillary equipment, and the coating layer contains a hydroxyl group-containing fluororesin composition and an isocyanate curing agent. Formed by using a clear coating composition containing 0.01 to 1.0 part by weight of an agent, 1 to 15 parts by weight of an ultraviolet absorber, and 1 to 30 parts by weight of an organosilicate compound, and the coating layer is urethane A self-cleaning road incidental facility formed on the outer surface of the road incidental facility through a primer layer formed using a modified acrylic primer, and the self-cleaning road incidental facility includes a base portion and the base portion A road sign post having a flexible polyurethane resin pole portion protruding upward from the outer wall of the pole portion. The primer layer is formed by using a down-modified acrylic-based primer and, in the upper of the pole portion, the surface over the primer layer together with the reflection sheet formed of a material having an active hydrogen is wound, The self-cleaning road incidental facility, wherein the coating layer is formed directly on the outer surface of the primer layer including the outer surface of the reflection sheet.

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