JP2013245482A - Road sign pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road sign pole formed of ether-based urethane, which is free from degradation due to fungus and excellent in mechanical strength, durability and moldability, having sufficient flexibility and restoring force.SOLUTION: The road sign pole includes a road sign body 2 having a hollow cylindrical shape, and a head 3 at the top edge and a pedestal 4 at the bottom edge of the road sign pole body 2, respectively. At least the outer surface of the road sign body 2 includes an ether-based urethane resin blended with an acrylonitrile-butadiene-styrene resin (ABS) or an acrylonitrile styrene acrylate resin (ASA).

Description

  The present invention relates to a road sign pillar, and more particularly, to a road sign pillar that is free from mold deterioration.

  Road sign pillars are installed on roads such as sidewalks, median strips, center lines (lane separation), branch points, parking lots, parks, entrances and exits, etc. for gaze guidance and vehicle entry suppression purposes.

  Such road sign pillars are required to have a flexibility that can be easily bent without damaging the vehicle or the like when a vehicle or the like collides, and a resilience that can be quickly restored from the bent state. In particular, ester urethanes having high mechanical strength are preferably used.

  However, it has been confirmed that the road sign pillar made of urethane is contaminated with mold within 10 years after installation and becomes black, and the sign pillar main body is torn and broken. The mechanism by which the sign post body is contaminated with mold and decays is as follows.

  The surface of the road sign pillar installed on the road surface is deteriorated by being exposed to ultraviolet rays, and eventually a fine crack enters the surface. Water droplets such as rain adhere to the cracks, causing hydrolysis and further deteriorating the surface. In addition to water droplets, dirt adheres to the cracks, and when mold spores further adhere to the dirt, N (nitrogen) of the hydrolyzed urethane NCO comes out on the surface, and mold is generated using this N as food. Over time, the entire surface eventually becomes moldy and black and decays, eventually tearing and becoming tattered.

  Conventionally, there are techniques disclosed in Patent Documents 1 and 2 as techniques for preventing contamination of road sign pillars.

  Patent document 1 is disclosing providing the antifouling film | membrane which consists of a fluorine resin excellent in stain resistance in the outer peripheral surface of a label | marker pillar main body.

  Patent Document 2 includes a reaction curable resin, a curing agent for the reaction curable resin, and a tetraalkoxysilane compound on the surface of the labeling column main body, and a solvent having a solubility parameter of 7.0 to 8.6 as a medium. Providing a coating layer with a transparent paint.

JP-A-7-76808 JP 2007-1000044 A

  Both techniques of Patent Documents 1 and 2 impart contamination resistance by forming a coating film layer on the surface of the main body of the marker column, but exclusively prevent contamination by exhaust gas. It is not intended to prevent contamination.

  As described above, mold contamination is caused by the occurrence of cracks and hydrolysis, but even if a coating layer is formed on the surface of the marker column body as in Patent Documents 1 and 2, it is realistic. It is not possible to completely prevent molds on the signpost body. That is, after the road surface is installed, the road sign pillar is always exposed to a collision of gravel or the like that is jumped up by a vehicle or the like, and the vehicle or the like may collide directly. As a result, the coating layer is damaged and the surface of the marker column body is exposed. If the surface of the sign post body is exposed due to damage to the coating layer, it will begin to deteriorate due to ultraviolet rays etc. from the damaged site, so cracks will occur in the sign post body, causing hydrolysis and causing mold as described above Resulting in.

  Therefore, the generation of mold cannot be completely prevented only by providing a coating layer for stain resistance on the surface of the main body of the marker column, which is not a realistic method from the viewpoint of preventing deterioration due to mold.

  By the way, the urethane used as the material of the marker column body includes an ether type urethane in addition to an ester type. Ether-based urethanes do not have ester groups and therefore do not hydrolyze and have stable properties against water, so they have excellent weather resistance and are thought to be free from mold deterioration as described above. Road sign that is required to be easily bent and quickly restored even if it collides with a vehicle, etc., because its mechanical strength is weak compared to urethane of the type, inferior in durability, and difficult to mold. It is not suitable for use as a component of a pillar.

  Moreover, in order to give mechanical strength to ether type urethane, this inventor makes thickness thick, or makes a double structure which provided the reinforcement body inside the label | marker pillar main body, and improves resilience. However, none of them led to a fundamental solution, and it was impossible to construct a road sign post having the same function as a conventional road sign post using ester-based urethane.

  Therefore, in order to prevent deterioration of the road sign pillar due to mold, the inventor pays attention to ether-based urethane that does not deteriorate due to such mold as a synthetic resin material for constituting the road sign pillar, and its weak points. The present inventors have intensively studied to improve the mechanical strength, durability and moldability, and have reached the present invention.

  That is, the present invention provides a road sign pillar that is free from the concern of mold deterioration due to the use of ether-based urethane, has excellent mechanical strength, durability, and moldability, and can satisfy flexibility and resilience. This is the issue.

  The other subject of this invention becomes clear by the following description.

  The above problems are solved by the following inventions.

(Claim 1)
Each of the marking column main body having a hollow cylindrical body and a head and a pedestal at the lower end of the marking column main body, and at least the outer surface of the marking column main body is made of ABS (acrylonitrile. A road sign pillar comprising a resin blended with butadiene / styrene resin) or ASA (acrylonitrile styrene acrylate resin).

(Claim 2)
The marker column body includes at least two layers of an outer layer disposed on the surface and an inner layer disposed on the inner side of the outer layer, and the outer layer is made of ether urethane resin with ABS (acrylonitrile butadiene styrene resin) or ASA. The road sign pillar according to claim 1, wherein the road sign pillar is made of a resin blended with (acrylonitrile styrene acrylate resin), and the inner layer is made of an ester urethane resin.

(Claim 3)
A reinforcement body made of a cylindrical body extending from the pedestal portion along the length direction of the label pillar body is provided inside the sign pillar body, and the reinforcement body is made of an ester-based urethane resin. The road sign post according to claim 1 or 2, wherein the hardness of the reinforcing body is higher than the hardness of the sign post main body.

(Claim 4)
A reinforcing body made of a cylindrical body extending from the pedestal portion along the length direction of the marking pillar main body is provided inside the marking pillar main body, and the reinforcing body is made of ABS (acrylonitrile) on an ether-based urethane resin. 3. A butadiene / styrene resin) or a resin blended with ASA (acrylonitrile styrene acrylate resin), and the hardness of the reinforcing body is higher than the hardness of the marker column body. Road sign pillar.

(Claim 5)
A reinforcing body made of a cylindrical body extending from the pedestal portion along the length direction of the marking pillar main body is provided inside the marking pillar main body, and the reinforcing body is made of a soft resin or a semi-rigid resin. The road sign pillar according to claim 1 or 2, wherein the road sign pillar has a two-layer structure of an outer layer and an inner layer made of a hard resin, and the hardness of the reinforcing body is higher than the hardness of the sign pillar main body.

(Claim 6)
The road sign pillar according to any one of claims 1 to 5, wherein a hardness of at least the head of the head and the pedestal is lower than a hardness of the sign pillar main body.

  According to the present invention, by using an ether-based urethane, there is provided a road sign pillar which is free from the concern of deterioration due to mold and has excellent mechanical strength, durability and moldability, and can satisfy flexibility and resilience. be able to.

Half sectional view of the road sign pillar according to the present invention Partial sectional view showing the layer structure of the sign post body Partial sectional view showing the layer structure of the reinforcement

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing an example of a road sign pillar according to the present invention. The road sign pillar 1 has a cap-shaped head 3 at the upper end of a pillar-shaped pillar body 2 made of a hollow cylindrical body. The pedestal 4 having a diameter slightly larger than that of the marker column main body 2 is fixed to the lower end. A reflective sheet 5 for securing visibility is affixed to the recessed portions of the sign post body 2, the head 3, and the pedestal 4.

  One mounting bolt 6 projects downward from the center of the lower end of the base portion 4. The mounting bolt 6 is embedded in the pedestal portion 4 at the head side. The road sign pillar 1 is erected on the road surface by screwing the mounting bolt 6 with a burying leg (not shown) embedded in the road surface in advance.

  Although not shown, the pedestal 4 is formed in a disk shape having a larger diameter than that of the sign post body 2 and is attached to bolt insertion holes provided at a plurality of locations protruding beyond the sign post body 2 in the periphery. The road sign pillar 1 may be erected by inserting a bolt and screwing it into a plurality of embedded legs embedded in the road surface in advance.

  The head 3 is formed of a synthetic resin separately from the sign post body 2, is attached so as to cover the upper end opening 2 a of the sign post body 2, and is integrally fixed by an adhesive. Thus, by forming the head 3 separately from the marker column body 2, the head portion can be changed to another marker in the existing manufacturing process, and the manufacturing cost can be reduced.

  A reinforcing body 7 made of a cylindrical body extending upward from the pedestal portion 4 along the length direction of the sign post main body 2 is provided concentrically with the sign post main body 2 inside the sign post main body 2. . The lower end of the reinforcing body 7 is embedded in the pedestal portion 4 in the same manner as the sign post body 2, and is integrally fixed by an adhesive.

  The outer diameter of the reinforcing body 7 is smaller than the inner diameter of the sign post body 2, and a predetermined space S is formed between the inner face of the sign post body 2. By providing this space S, when a pedestrian or bicycle comes into contact with the sign post body 2, the sign post body 2 can be bent by the space S, and the road sign post with the hardness of the reinforcement 7 level. Compared to the case of contact, the risk of pain and injury felt by pedestrians and the like can be reduced.

  Although this reinforcing body 7 is not essential in the present invention, it is for imparting a predetermined strength to the road sign post 1 and is a preferred embodiment in the present invention to play a role of reinforcing the sign post main body 2. is there.

  Next, the synthetic resin material which comprises the marker pillar main body 2 is demonstrated.

  In the present invention, at least the outer surface of the marker column main body 2 is made of a resin obtained by blending ABS (acrylonitrile / butadiene / styrene resin) or ASA (acrylonitrile / styrene acrylate resin) with ether type urethane resin.

  The ether-based urethane resin does not deteriorate due to mold like the ester-based urethane resin that has been conventionally used as a synthetic resin material for the marker column main body.

  In the present invention, ABS or ASA is blended with an ether-based urethane resin. However, since ABS or ASA is not a material that deteriorates due to mold, the blend does not cause deterioration due to mold.

  By blending ABS or ASA with this ether-based urethane resin as described above, it is possible to obtain the same mechanical strength as when a conventional ester-based urethane resin is used, and the moldability is improved. A road sign pillar 1 having the same function as a road sign pillar using a urethane resin and having no fear of deterioration due to mold as described above can be configured.

  As the ether-based urethane resin used in the present invention, those commercially available from DIC Bayer Polymer Co., Ltd., Nippon Milactolan Co., Ltd. and the like can be used.

  The blending amount (blend amount) of ABS or ASA is preferably 45% to 85% by weight. If it is less than 45% by weight, it becomes urethane-rich and expensive, and if it exceeds 85% by weight, it becomes highly rigid and difficult to restore.

  By appropriately adjusting the blend amount of ABS or ASA with respect to the ether-based urethane resin, the rigidity of the obtained marker column body 2 can be adjusted.

  Here, an experimental example in the case where ABS is blended with an ether-based urethane resin (a commercial product manufactured by DIC Bayer Polymer Co., Ltd. was used) will be described. Table 1 shows the results of measurement of hardness, tensile strength, elongation, bending strength and bending elastic modulus with various blend amounts. For comparison, measurement results of 100 parts by weight of ester urethane resin, 100 parts by weight of ether urethane resin, and 100 parts by weight of ABS (hard type) were included.

  There are various application grades for urethane and ABS used in the tests in Table 1. Here, urethane is a material of hardness A88 for extrusion or injection molding of ether-based urethane, and ultrahigh impact grade for ABS. Selected.

The measurement method of the test item in Table 1 is as follows.
Specific gravity: Hardness by hydrometer: JIS K 6253 (1997), 7215 (1986) Tensile strength by durometer D: JIS K 6251 (1993)
Elongation: JIS K 6251 (1993)
Bending strength: JIS K 7171 (1994)
Flexural modulus: JIS K 7171 (1994)

  From the above measurement results, it was confirmed that the mechanical properties of the blend material are equivalent to the mechanical properties of the ester urethane resin.

  It has been confirmed by the present inventor that when ASA is used, it changes in the same manner as in Table 1.

  According to the present invention, by appropriately adjusting the blend amount of ABS or ASA, for example, for roadsides where relatively high hardness is preferable, and for road lines where the relatively low hardness is preferable for centerlines, etc. 1 can be configured.

  The sign post body 2 may be composed of only a single layer, but may be composed of two layers, an outer layer and an inner layer. In the case of only a single layer, the entire marker pillar body 2 is composed of the above-mentioned blend resin. In the case of two layers, if the outermost layer is composed of the above-mentioned blend resin, The effect which can prevent generation | occurrence | production is acquired. Therefore, as shown in FIG. 2, in the case where the marker column main body 2 is composed of two layers of the outer layer 21 and the inner layer 22, it is only necessary that the outer layer 21 is composed of the blend resin.

  When the marker pillar body 2 has a two-layer structure, the inner layer 22 can be formed of an ester-based urethane resin similar to the conventional one. By using the ester-based urethane resin for the inner layer 22, the mechanical strength of the marker column main body 2 can be further improved as compared with the case where the inner layer 22 is made of only a blend resin of an ether-based urethane resin and ABS or ASA.

  In this case, the entire thickness of the marker column main body 2 can be the same as that of a conventional marker column main body made of ester urethane resin.

  The marker column body 2 is generally formed by spiral extrusion, but the marker column body 2 having a two-layer structure of the outer layer 21 and the inner layer 22 can be formed by two-layer coextrusion molding. Since it is simultaneous extrusion, the molding process is only one step, and the cost merit is good.

  In addition, the label | marker pillar main body 2 can also be made into three or more layers. In the case of three or more layers, the outer layer disposed on the outermost surface may be the above-mentioned blend resin, and any inner layer disposed on the inner side of the outer layer may be formed of an ester urethane resin.

  As this ester-based urethane resin, those conventionally used can be used, for example, those commercially available from DIC Bayer Polymer Co., Ltd., Nippon Milactolan Co., Ltd. and the like.

  The strength improvement of the sign post body 2 can be obtained by the reinforcing body 7 in place of the sign post main body 2 having a plurality of layers as described above, or in addition to the plurality of layers. That is, when the reinforcing body 7 is provided, the reinforcing body 7 may be made of ester urethane resin.

  In this case, it is preferable that the hardness of the reinforcing body 7 is higher than the hardness of the marker column main body 2. As a result, the sign post body 2 is relatively soft when a bicycle or a pedestrian collides, but the road sign post 1 can be given a certain degree of rigidity, and the sign post main body 2 has an impact resistance. And bending recovery can be further improved.

  The hardness of the reinforcing body 7 (durometer hardness according to JIS K 6253) is preferably A98 ± 3 when the hardness of the marker column body 2 is A95 ± 3.

  Further, from the same viewpoint, the reinforcing body 7 may be made of a resin obtained by blending ABS or ASA with an ether-based urethane resin. Reinforcing body 7 itself can also prevent generation of mold, which is a more preferable embodiment. In this case, the hardness of the reinforcing body 7 is also made higher than the hardness of the sign post body 2 by appropriately adjusting the blend amount of ABS or ASA, so that the impact resistance and the bending recovery property of the sign post body 2 are further improved. Can be improved.

  Further, as shown in FIG. 3, the reinforcing body 7 has a two-layer structure of an outer layer 71 made of a soft resin or a semi-rigid resin and an inner layer 72 made of a hard resin. By making it higher than the hardness of the main body 2, the impact resistance and the bending recovery property of the marker column main body 2 may be further improved. In particular, since the outer layer 71 is made of a soft resin or a semi-rigid resin, it is possible to absorb an impact when an automobile, a bicycle, or a pedestrian collides.

Examples of the soft resin in this case include a urethane resin having a durometer A (1S) of 80 or more and less than 90 according to JIS K 6253: 1997.
Examples of the semi-rigid resin include urethane resins having a durometer A (1S) of 90 or more and 98 or less in accordance with JIS K 6253: 1997.
Further, examples of the hard resin include urethane resins having a durometer A (1S) of 60 or more and 70 or less according to hardness JIS K 6253: 1997.

  The reinforcing body 7 composed of the outer layer 71 and the inner layer 72 can be formed by two-layer coextrusion molding. Since it is simultaneous extrusion, the molding process is only one step, and the cost merit is also good.

  In the present invention, it is preferable that the hardness of at least the head 3 out of the head 3 and the pedestal 4 is lower than the hardness of the sign post body 2.

  The head portion 3 and the pedestal portion 4 can be formed by cast molding of, for example, an elastically deformable polyurethane resin. Of these, by making the hardness of the head 3 at least lower than the hardness of the sign post body 2, if the vehicle collides or crawls, the vehicle is less likely to be scratched even if it bounces afterwards, and the impact of the collision Less.

  Further, if the hardness of the pedestal portion 4 is also lower than the hardness of the sign post body 2 like the head 3, the sign post main body 2 is more easily deflected at the site of the pedestal part 4 when the vehicle collides or hits. Therefore, the impact on the vehicle can be further reduced, and the rebound can be slowed, which is preferable because the damage to the vehicle can be further reduced.

  The hardness of the head 3 and the pedestal 4 (durometer hardness according to JIS K 6253) is preferably A88 ± 3 when the hardness of the marker column body 2 is A95 ± 3.

1: road sign pillar 2: sign pillar main body 2a: main body upper end opening 21: outer layer 22: inner layer 3: head 4: pedestal part 5: reflection sheet 6: mounting bolt 7: reinforcement 71: outer layer 72: inner layer

Claims (6)

  Each of the marking column main body having a hollow cylindrical body and a head and a pedestal at the lower end of the marking column main body, and at least the outer surface of the marking column main body is made of ABS (acrylonitrile. A road sign pillar comprising a resin blended with butadiene / styrene resin) or ASA (acrylonitrile styrene acrylate resin).   The marker column body includes at least two layers of an outer layer disposed on the surface and an inner layer disposed on the inner side of the outer layer, and the outer layer is made of ether urethane resin with ABS (acrylonitrile butadiene styrene resin) or ASA. The road sign pillar according to claim 1, wherein the road sign pillar is made of a resin blended with (acrylonitrile styrene acrylate resin), and the inner layer is made of an ester urethane resin.   A reinforcement body made of a cylindrical body extending from the pedestal portion along the length direction of the label pillar body is provided inside the sign pillar body, and the reinforcement body is made of an ester-based urethane resin. The road sign post according to claim 1 or 2, wherein the hardness of the reinforcing body is higher than the hardness of the sign post main body.   A reinforcing body made of a cylindrical body extending from the pedestal portion along the length direction of the marking pillar main body is provided inside the marking pillar main body, and the reinforcing body is made of ABS (acrylonitrile) on an ether-based urethane resin. 3. A butadiene / styrene resin) or a resin blended with ASA (acrylonitrile styrene acrylate resin), and the hardness of the reinforcing body is higher than the hardness of the marker column body. Road sign pillar.   A reinforcing body made of a cylindrical body extending from the pedestal portion along the length direction of the marking pillar main body is provided inside the marking pillar main body, and the reinforcing body is made of a soft resin or a semi-rigid resin. The road sign pillar according to claim 1 or 2, wherein the road sign pillar has a two-layer structure of an outer layer and an inner layer made of a hard resin, and the hardness of the reinforcing body is higher than the hardness of the sign pillar main body. The road sign pillar according to any one of claims 1 to 5, wherein a hardness of at least the head of the head and the pedestal is lower than a hardness of the sign pillar main body.

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