WO2020096333A1 - Plastic road barrier capable of removing nitrogen oxide - Google Patents

Abstract

The present invention relates to a road barrier among road facilities, the road barrier comprising a block-shaped plastic body formed in the longitudinal direction and a paint-coating layer coated on the surface of the body. The paint contains a titanium dioxide-based photocatalyst capable of removing NOx, and the photocatalyst is formed by being simultaneously doped with lead (Pb) as a required metal element and one selected from sodium (Na) and calcium (Ca) as a selective metal element in a titanium dioxide (TiO 2) lattice structure. According to the present invention, there is an effect that can prevent air pollution and provide a comfortable road environment by removing harmful substances, especially NOx, due to vehicle exhaust.

Description

Nitrogen oxide removable plastic road boundary stone

The present invention relates to a road boundary stone among road facilities, and particularly to a road boundary stone that is made of plastic as a main raw material and can remove nitrogen oxides (NOx).

Road boundary seats usually have a continuous shape as shown in Figs. 1 and 2, and refer to installations continuously installed along the borders of roads to distinguish roads, sidewalks, roads, roads, or roads and non-roads. Traditionally, concrete or stone has been used as a material, so this is called a boundary stone, but recently, many plastic road boundary stones have been proposed.

On the other hand, nitrogen oxides (NOx) is a compound of nitrogen and oxygen. It is an air pollutant generated by the oxidation of nitrogen in the air at high temperatures during the combustion process, and there are automobiles, ships, aircraft, incinerators, etc. It is a car driving. As a countermeasure to this emission, it is important to reduce emissions through improving the performance of automobiles, but it is also important to remove the emitted nitrogen oxides. Therefore, it is of great technical significance that the present invention intends to apply a photocatalyst capable of effectively removing nitrogen oxide by reacting widely in the visible light region to the road boundary stone above.

In general, a photocatalyst is a semiconductor that can purify pollutants by decomposing / removing harmful organic substances into harmless components as it has strong oxidizing and reducing power by reacting when a certain amount of light energy is received and forming electrons and holes. Titanium dioxide (TiO ₂ ) is typically used to remove nitrogen oxides and the like.

This titanium dioxide photocatalyst has the advantage of being chemically stable, harmless to the human body, and relatively inexpensive, but the energy band gap is 30-32 eV, and light in the ultraviolet region is required for its action. However, since most of the sunlight is in the visible region and the ultraviolet region is less than 5%, the photocatalyst needs to be able to absorb light in the visible region, which occupies most of the sunlight, in order to effectively use solar energy, which ultimately determines semiconductor properties. It is possible by changing the band spacing structure.

As is well known, in order to change the semiconductor structure, a method of doping an element having a different valence number is mainly used in a titanium dioxide lattice, which creates a new trap site between the band gaps, a visible light region that is lower than ultraviolet light. It is to be able to absorb the light of. In particular, when the cation site is replaced with a metal (for example, Fe, Cr, V, Co, Si, etc.) element, it has been reported to exhibit optical material properties in visible light irradiation, and the titanium dioxide photocatalyst substituted with a metal element through the above doping. Visible light response properties are improved compared to pure titanium dioxide photocatalyst.

However, the visible light absorption of the doped titanium dioxide photocatalyst and the decomposition efficiency of organic matter have not actually reached a satisfactory level, and in the ultraviolet region, the photocatalytic properties are significantly deteriorated. On the one hand, various defects due to charge imbalance when doping a transition metal have been reported.

<Prior Art Document>

Patent Registration No. 10-0666780,

Registered Patent Publication No. 10-1439264

Published Patent Publication No. 2014-0011728

Registered Patent Publication No. 10-1782540

Registered Patent Publication No. 10-0807171

Patent Registration No. 10-0654331

The object of the present invention is based on a plastic road boundary stone formed of synthetic resin, and by adding a photocatalytic function capable of efficiently removing harmful substances, especially NOx, caused by exhaust of automobiles, NOx effective in preventing air pollution on the roadside and improving the environment The aim is to provide a removable plastic road boundary stone.

Another object of the present invention is to provide a plastic road boundary stone which is easy to vertically and horizontally arrange and construct a continuous road boundary stone in the field and that can be firmly maintained even after construction. Another object of the present invention is to provide a plastic road boundary stone capable of improving economic efficiency, productivity, durability, and handling properties by manufacturing using waste synthetic resin.

Road boundary stone of the present invention:

In a road boundary stone continuously installed along a road boundary to distinguish a road and a road, a road and a road, or a road and a non-road,

A block-shaped plastic body formed in the longitudinal direction, and a coating layer coated on the surface of the body;

The coating includes a titanium dioxide-based photocatalyst capable of removing NOx;

The photocatalyst:

A titanium dioxide (TiO2) lattice structure in which one selected from lead (Pb) as a necessary metal element and sodium (Na) and calcium (Ca) as a selected metal element is simultaneously doped;

Characterized by,

At this time, the total content of the necessary and optional metal elements contained in the titanium dioxide is 5 parts by weight to 15 parts by weight with respect to 100 parts by weight of titanium dioxide;

It is characterized by.

Preferably, each content of the required and selected metal elements contained in the titanium dioxide is preferably 2.5 parts by weight to 10 parts by weight with respect to 100 parts by weight of titanium dioxide, and more specifically, it is necessary with respect to 100 parts by weight of titanium dioxide The metal element is 7 ± 0.5 parts by weight and the selected metal element is 5 ± 0.5 parts by weight.

The body:

A block in which a through hole in the longitudinal direction is formed in the central portion;

A connecting rod connecting successively through a plurality of bodies by sequentially passing through adjacent through holes of the block;

It includes.

Preferably, the through hole and the connecting rod are formed in an elliptical shape to prevent rotation of any axis of the main body. Here, the main body and the connecting rod may be formed using a low-cost waste synthetic resin as a vegetable by-product, rice husk, sawdust, or a mixed raw material.

The road boundary stone of the present invention is based on a plastic road boundary stone formed of synthetic resin, and is configured by adding a photocatalytic function capable of efficiently removing road harmful substances, especially NOx, due to exhaust of automobiles. Accordingly, it is possible to prevent air pollution and provide a comfortable road environment by removing harmful substances, especially NOx, caused by exhaust of automobiles on the road and around the road.

On the other hand, by the connecting rod structure that passes through the boundary stone bodies arranged one after another, there is an effect that it is easy to arrange and construct road boundary stones continuously in the field, and can be maintained firmly without fear of being separated after construction. In addition, when using a waste synthetic resin for the formation of the block, the appearance is maintained as a coating layer coating, there is an effect that can improve the economic efficiency, productivity.

1 and 2 is a state diagram of a normal road boundary seats.

3 is a perspective view of a road boundary stone according to the present invention.

Figure 4 is an exploded view of Figure 3;

5 is a cross-sectional view taken along line 'A-A' in FIG. 3;

[Description of codes]

10. Road boundary stone

11. Main body

12. Coating layer

13. Through hole

14. Block

15. Connecting rod

16. Non-slip

The features and effects of the above-described or not described "road boundary stone capable of removing nitrogen oxides" (hereinafter referred to as "road boundary stone") will become more apparent through the description of embodiments of the present invention described below with reference to the accompanying drawings. . In the drawings below FIG. 3, the road boundary stone according to the present invention is indicated by reference numeral 10.

In general, the road boundary stone refers to a road installation such as FIGS. 1 and 2 extending along the boundary of a roadway to distinguish a roadway and a roadway or a roadway, and the roadway boundarystone 10 of the present invention is also the same in this regard. 3 to 5, the road boundary stone 10 of the present invention includes a block-type plastic body 11 formed in the longitudinal direction and a coating layer 12 applied to the surface of the body 11, The paint is to include a special photocatalyst in the present invention.

Hereinafter, the 'photocatalyst' will be first described, and then the structure of the paint and road boundary stone will be described in turn. For reference, the 'photocatalyst' mentioned below is the same as described in the applicant's patent application No. 2018-0070142.

[Photocatalyst]

The present inventor doped lead (Pb), which is known as the heaviest metal among stable elements in the titanium dioxide lattice structure, but at this time, selected other metal elements and simultaneously doped it with a certain content, thereby remarkably excellent response characteristics to ultraviolet light and visible light After confirming that the photocatalyst function was exhibited, the photocatalyst development was completed. Accordingly, the photocatalyst applied to the present invention is a titanium dioxide-based photocatalyst, and one selected from lead (Pb) as a required metal element and sodium (Na) and calcium (Ca) as a required metal element in a titanium dioxide (TiO2) lattice structure is simultaneously doped. It is characterized by being.

In this case, the total content of the necessary and optional metal elements contained in the titanium dioxide is 5 parts by weight to 15 parts by weight with respect to 100 parts by weight of titanium dioxide. For example, when the content of the metal element doped in titanium dioxide exceeds the above range, excitation electrons do not work effectively, and thus, the photocatalytic function tends to decrease. On the contrary, when it is less than the range, the visible light response property tends to significantly decrease.

Preferably, each content of the required and selected metal elements contained in the titanium dioxide is 2.5 parts by weight to 10 parts by weight with respect to 100 parts by weight of titanium dioxide, and more specifically, the necessary metal elements with respect to 100 parts by weight of titanium dioxide 7 It is preferable that the content of the required metal element is slightly larger than the content of the selected metal element, such as ± 0.5 parts by weight and the selected metal element 5 ± 0.5 parts by weight. However, there is no significant difference in optical properties in terms of content between the required metal elements.

[Produce]

The titanium dioxide precursor solution, a lead precursor solution as a required metal element, and a precursor solution selected from sodium and calcium as a metal element are simultaneously mixed and stirred, so that Pb and one of the selected metal elements are simultaneously doped in a lattice structure. Titanium dioxide photocatalyst in (sol) state is produced. In some cases, the titanium dioxide precursor solution and the lead precursor solution, which is a required metal element, are first mixed, and the mixed solution is mixed and stirred by mixing the selected metal element precursor, and the result is the same, but the doping state is more stable. Seems to. Of course, the specific configuration of the doping can be divided into 'Pb, Na-TiO ₂ ' and 'Pb, Ca-TiO ₂ ', but there is no significant difference in optical properties between them.

The titanium dioxide precursor is a conventional titanium tetraisopropoxide (TTIP) and isopropyl alcohol is used as a dispersion solvent. The lead precursor is Pb (NO ₃ ) ₂ and a mixed solution of water and ethanol is used as a dispersion solvent. Among the selected metal elements, the sodium precursor is NaNO ₃ and an aqueous nitric acid solution is used as a dispersion solvent, and the calcium precursor is Ca (NO ₃ ) ₂ · 4H ₂ O and distilled water is used as a dispersion solvent.

However, the precursors and solvents described above are only representative examples, and the present invention is not limited to those types.

The doped titanium dioxide in the above-described sol state is evaporated under reduced pressure at 40 to 50 ° C. to form a titanium dioxide photocatalyst in a powdered state. And for the solid crystallization of the titanium dioxide photocatalyst, the titanium dioxide photocatalyst is calcined at 450 to 550 ° C for 3 to 5 hours. Depending on the firing process and firing temperature, the nanoparticle size and properties of the titanium dioxide photocatalyst may vary slightly, for example, when the firing temperature is 500 ° C, the most efficient maximum photolysis efficiency is exhibited.

The calcined photocatalyst can be washed with water, filtered and dried to remove impurities on the surface. As a result, the titanium dioxide photocatalyst according to the present invention is prepared, and the finally obtained titanium dioxide photocatalyst is doped with platinum ions and nitrogen ions in the titanium dioxide lattice structure, wherein the titanium dioxide photocatalyst has a particle size of 5 to 10 nm.

[Example]

For the doping of the required metal element, the first solution is prepared by dissolving Pb (NO ₃ ) ₂ in water-ethanol mixture, and the second solution is prepared by dissolving NaNO ₃ in nitric acid aqueous solution for doping of the selected metal element. Did. Then, the first and second solutions were simultaneously mixed in an isopropyl alcohol solution containing titanium tetraisopropoxide (TTIP) and sufficiently stirred for at least 12 hours to react with each other, so as to sol doped titanium dioxide. Photocatalyst (Pb, Na-TiO ₂ ) is produced.

Then, in order to obtain the crystalline phase of the photocatalyst in the sol state, it was evaporated under reduced pressure at 45 ° C and then calcined at 500 ° C for 4 hours. And washed with water and dried to remove the surface impurities of the calcined photocatalyst, the lead and sodium doped titanium dioxide photocatalyst (Pb, Na-TiO ₂ ) was prepared. At this time, the total content of Pb and Na contained in titanium dioxide was adjusted to 12 ± 1 parts by weight relative to 100 parts by weight of titanium dioxide, but each content was set to 7 ± 0.5 parts by weight and 5 ± 0.5 parts by weight.

In addition, calcium was selected instead of sodium among the selected metal elements, and a titanium dioxide photocatalyst (Pb, Ca-TiO ₂ ) doped with lead and calcium was prepared in the same manner as above. In each photocatalyst prepared by the above example, the content of the doped metal element with respect to 100 parts by weight of titanium dioxide is shown in [Table 1].

On the other hand, as a result of analysis in each example, the specific content of the titanium dioxide photocatalyst within the range that the content of the Pb and the selected metal element is within the effective range of 2 parts by weight to 10 parts by weight and the total content does not exceed 15 parts by weight It was found not to occur, but it was found to be advantageous when the content of the required metal element (Pb) was slightly larger than the content of the selected metal element. Therefore, the case where the total amount and each content of the Pb and the selected metal element are different is not described separately.

[Comparative example]

The same sol-gel method as described in the above example was used, but pure titanium dioxide photocatalyst without metal elements added (undoped TiTO ₂ ), only lead doped titanium dioxide photocatalyst (Pb-TiTO ₂ ) and only A titanium dioxide photocatalyst (Na, Ca or Ni-TiTO ₂ ) doped with one of the selected metal elements was prepared and used as Comparative Examples 1 to 3, respectively. In each photocatalyst prepared by the above comparison, the content of the doped metal element relative to 100 parts by weight of titanium dioxide is shown in [Table 2].

The reason why all the selected metal elements are described in Comparative Example 3 is that even if any element is selected, there is little difference in the properties of the titanium dioxide photocatalyst. On the other hand, if necessary, a Degussa P25 product known to have excellent efficiency among commercially available titanium dioxide photocatalysts was used as Comparative Example 4.

[Absorbance]

For each photocatalyst of Examples and Comparative Examples, ultraviolet-visible light absorbance was measured using a Diffuse Reflectance UV-Visable Spectrophotometer (DRS). As a result, the photocatalysts of Comparative Examples 1 and 3 hardly absorbed light in the visible region. On the other hand, the photocatalyst of Comparative Example 2 absorbed light in the visible light region in the range of 400-500 nm, and the photocatalysts in Examples 1 and 2 were investigated to efficiently absorb light in the visible region in a much wider range. At this time, there was no significant difference between Examples 1-3.

This is considered to be because the titanium dioxide photocatalyst in which one of the required metal element and the selected metal manuscript is doped at the same time in the present invention forms more trap sites between band gaps than in other cases.

[Crystal structure]

For each photocatalyst of Examples and Comparative Examples, the crystal structure of the powder was examined using X-ray diffraction analysis. As in the comparative examples, it can be seen that the photocatalysts of Examples 1 and 2 also have a mixture of anatase phase and some rutile phase, and it is judged that a part of the anatase phase transition to rutile at the firing temperature.

As is known, in the titanium dioxide photocatalyst, it is known that the photocatalyst powder exhibits better photocatalytic properties when the anatase phase coexists with the rutile phase in a proper ratio than when it is a pure anatase phase, so that the photocatalyst according to the embodiment of the present invention is not at all disadvantageous in nature. It can be seen that it does not.

[Specific surface area]

The specific surface area of each photocatalyst of Examples and Comparative Examples was measured, and the results are shown in [Table 3].

For reference, in the case of Examples 1 and 2, since there is no specific difference on the specific surface area between each photocatalyst, the average value was described. Referring to [Table 3] above, it can be seen that in the case of the photocatalysts of Examples 1 and 2, the specific surface area increased more than 2 times as compared to the photocatalysts of Comparative Examples 1 to 3. Therefore, it is expected to increase the photoactive efficiency with increasing specific surface area.

[Light active]

Reactors were used to evaluate the photoactivity for each photocatalyst of the examples and comparative examples. Examples 1, 2 and Comparative Examples 1 to 4 into a photocatalyst of the reactor, was determined and analysis of the exhaust gas within the NO ₂ concentration for 6 hours while injecting a gas containing 100 ppm of the concentration of nitrogen oxides NO _2. In this case, light having a wavelength of 290 nm or more is transmitted through ultraviolet light irradiation, and light having a wavelength of 430 nm or higher is transmitted through visible light irradiation. Table 4 shows the measurement results.

Referring to [Table 4] above, P25 photocatalyst of Comparative Example 4 most effectively decomposed and removed NO ₂ under ultraviolet light irradiation, and the photocatalysts of Examples 1 and 2 showed slightly lower decomposition efficiency than P25 photocatalyst. Compared to the photocatalysts of Examples 1 to 3, it shows superior efficiency.

On the other hand, the photocatalysts of Comparative Examples 1, 3, and 4 under ultraviolet light irradiation are not activated by visible light, so they are shown to be fine enough to say that almost no decomposition occurs, and the photocatalyst of Comparative Example 2 shows some decomposition efficiency. On the other hand, in the case of the photocatalysts of Examples 1 and 2, the decomposition efficiency close to perfection was shown. This is considered to be because the specific catalysts of Examples 1 and 2 had a relatively high specific surface area. In addition, although not described, the investigation targeting NO showed that the removal efficiency was better than the above case.

As described above, since the above photocatalyst can exhibit excellent responsiveness and photocatalytic efficacy in a wide wavelength range from the ultraviolet region to the visible ray region, it is particularly applied to paints for road boundary stone to effectively decompose and remove harmful NOx emitted from vehicles. It is expected to help greatly in purification.

[varnish]

The paint is constructed and used for the purpose of forming the coating layer 12 on the surface of the plastic road boundary stone 10, and the paint contains at least the above-described titanium dioxide photocatalyst. This paint normally contains a composition for the production of a paint, in addition to the photocatalyst, for example, a water-soluble binder resin, a dispersant, and a pigment. If necessary, it may further contain a luminous material that absorbs and emits light. This coating may be applied by a method such as spray, brush, roller, printing, etc., but the coating layer 12 is applied to the surface of the road boundary stone 10 by being applied and dried and cured by a double extrusion method in the embodiment of the present invention. Is formed.

[Road boundary stone]

3 to 5, the road boundary stone 10 of the present invention, like a general road boundary stone, is a continuous installation along a road boundary to distinguish a road and a sidewalk, a road and a road, or a road and a non-road. In particular, the road boundary stone 10 of the present invention is a road boundary stone coated with the titanium dioxide photocatalyst coating capable of removing harmful elements such as nitrogen oxides discharged from the vehicle based on plastic.

The road boundary stone 10 of the present invention comprises a block-shaped plastic body 11 formed in the longitudinal direction and a coating layer 12 coated with 0.1 to 0.3 mm on the surface of the body 11, wherein the paint Is to include the photocatalyst described above. Thus, it is possible to provide a safe and sanitary environment for drivers, passengers, and surrounding residents by efficiently driving nitrogen vehicles and other harmful substances as well as inducing safe driving of vehicles on a vehicle driving road.

As described above, a representative emission source of nitrogen oxides (NOx) is a vehicle driving on the road. Therefore, it can be said that the present invention is technically meaningful to apply a photocatalyst capable of effectively removing nitrogen oxide by reacting widely in the visible light region to a road boundary stone installed on a road.

The road boundary stone 10 of the present invention comprises a plurality of bodies 11 and a coating layer 12 formed on the surface of the bodies 11. Specifically, the main body 11 has a plurality of main bodies 11 by sequentially passing through a block 14 in which a longitudinal through hole 13 is formed in a central portion and an adjacent through hole 13 of the block 14. It includes a connecting rod 15 that connects one after another. And the coating layer 12 is a coating layer of the paint containing the above photocatalyst.

More specifically, the main body 11 is a plastic block 14 in which a longitudinal through hole 13 is formed in a central portion, and a plurality of successively arranged side-to-side faces, wherein each through hole 13 is It is configured to communicate with each other. In addition, the connecting rod 15 is installed while passing through the adjacent through-holes 13 of the plurality of bodies 11 arranged as above in close order to the inner wall to connect the plurality of bodies 11 to arrange the road boundary stones 10 , It is a flexible plastic rod that facilitates construction and maintenance. Preferably, the through hole 13 and the connecting rod 15 are formed in an elliptical shape to prevent rotation of any axis of the body 11.

Here, the main body 11 and the connecting rod 15 are extruded using a low-temperature waste synthetic resin as a predominant vegetable by-product chaff, sawdust, or a mixed raw material. The waste synthetic resin is a mixture of PP, PE, and vinyl, which can be commonly collected, or only waste vinyl, which is the easiest to collect and process. The waste synthetic resin has low durability compared to concrete or stone road boundary stone and is not broken or damaged, but has excellent durability, but has weak physical strength. Accordingly, in this embodiment, the waste synthetic resin, a vegetable by-product, rice husk, sawdust or a mixture thereof is used as a fiber-reinforced filler. At this time, the vegetable by-product is mixed in 20-30 parts by weight with respect to 100 parts by weight of the waste synthetic resin.

The vegetable by-products are also inexpensive and mixed in the waste synthetic resin to actually improve the strength and bonding strength of the whole body 11 and connecting rod 15, but if the content is more than the proper range, cracks or breakage may occur. It may occur, and below that, the desired function cannot be exerted. Therefore, the content of the vegetable by-product is meaningful, and there is no significant difference as a result within the range. Along with this, a small amount of an anti-aging agent and a foaming agent are added to the waste synthetic resin and extruded through an extruder, whereby the body 11 and the connecting rod 15 are manufactured.

The connecting rod 15 is installed while sequentially passing through the through-holes 13 of each body 11 in a state where a plurality of bodies 11 are successively arranged, so as to connect the plurality of bodies 11, the arrangement, construction, and Easy to maintain. As the through hole 13 of the body 11 may be straight or curved, the connecting rod 15 corresponding thereto may also be straight or curved.

On the other hand, the connecting rod 15 is a plastic rod using waste synthetic resin, and has the advantage of being able to flexibly adapt to the curvature of the through hole 13 due to its bending characteristics. In addition, the road boundary stone 10 of the present invention has an advantage in that the connection relationship and the arrangement relationship are not damaged by external force even after construction because a plurality of bodies 11 are physically connected by the connecting rod 15.

However, the unit body 11 may be axially rotated on the connecting rod 15 according to circumstances such as ground or shock. As shown in this, the connecting rod 15 is formed into an elliptical shape to prevent any axial rotation of the body 11, and more preferably, the inner wall of the through hole 13 and the connecting rod 15 for mutually strong coupling The surface of the can be made to correspond in the form of radial irregularities.

The coating layer 13 is a coating layer in which the above-described photocatalyst material is added to the synthetic resin, and the luminous material may be further mixed. The synthetic resin material of the surface layer 13 is a new material in which the waste synthetic resin, which is a waste material, is not used. When the waste synthetic resin is exposed as it is, it is not actually aesthetically pleasing, and it is difficult to express various colors, and it is difficult to express the optical properties of the material. Because it loses.

[Example]

In the above, the main body 11 and the connecting rod 15 are individually made of the same material. The low-cost recycled waste synthetic resin was collected without screening and pulverized and mixed to a size of 10 ㎣ to prepare a waste synthetic resin mixture. Then, 25 parts by weight of rice husk as a by-product of the mixture was mixed with 100 parts by weight, and then heated to a high temperature to prepare a recycled plastic raw material. Then, by inserting and extruding the raw material into a separate extruder, a main body 11 and a connecting rod 15 were provided.

Thereafter, a coating layer 12 is formed on the provided body 11 by applying the paint. The paint is constructed and used for the purpose of forming the coating layer 12 on the surface of the plastic body 11, which is a photo-reactive material to a conventional polyethylene resin with a luminous material and a titanium dioxide photocatalyst material added. It is prepared by properly containing a binder, a dispersant, and a pigment. This paint may be applied by a method such as spray, brush, roller, printing, etc. In this embodiment, it is formed on the surface of the body 11 in a cavity and continuous process with the body 11 by a double extrusion method, and is dried and cured. By doing so, the coating layer 12 is formed on the surface of the body 11.

When the main body 11 having the coating layer 12 and the connecting rod 15 are provided as described above, first, the main body 11 is successively arranged in a state where the side faces on the support or the ground, and in this state, the By connecting the connecting rods 15 to the through holes 13 of the arranged body 11 in sequence, a plurality of bodies 11 are connected to complete the construction of the road boundary stone 10.

If other necessary elements such as rubber or plastic non-sleep (for example, reference numeral '16' in FIG. 3) are needed to be placed and fitted between adjacent bodies 11, a through hole is made there to make the connecting rod. Let (15) penetrate. Therefore, this structure has an advantage of excellent adaptability even when other structures need to be disposed between, for example, adjacent road boundary stones 10 bodies.

Claims (11)

1. In a road boundary stone continuously installed along a road boundary to distinguish a road and a road, a road and a road, or a road and a non-road,

   A block-shaped plastic body 11 formed in the longitudinal direction, and a coating layer 12 coated on the surface of the body 11;

   The coating includes a titanium dioxide-based photocatalyst capable of removing NOx;

   The photocatalyst:

   In the titanium dioxide (TiO2) lattice structure, one selected from lead (Pb) as a required metal element and sodium (Na) and calcium (Ca) as a selected metal element is simultaneously doped; At this time

   The total content of the necessary and optional metal elements contained in the titanium dioxide is 5 parts by weight to 15 parts by weight based on 100 parts by weight of titanium dioxide;

   Characterized by NOx removable road boundary stone.
2. According to claim 1,

   Each content of the required and optional metal elements contained in the titanium dioxide, NOx removable road boundary stone, characterized in that 2.5 to 10 parts by weight based on 100 parts by weight of titanium dioxide.
3. According to claim 2,

   Each content of the necessary and optional metal elements contained in the titanium dioxide is a NOx removable road, characterized in that the required metal element is 7 ± 0.5 parts by weight and the selected metal element is 5 ± 0.5 parts by weight relative to 100 parts by weight of titanium dioxide. boundary stone.
4. According to claim 1,

   The doping is:

   A mixture of titanium dioxide precursor solution, lead precursor solution, and one precursor solution selected from a metal element;

   Characterized by NOx removable road boundary stone.
5. According to claim 1,

   The doping is:

   A titanium dioxide precursor solution and a lead precursor solution are first mixed and stirred, and the mixture solution is mixed and stirred by a second precursor solution selected from among selected metal elements;

   Characterized by NOx removable road boundary stone.
6. According to claim 1,

   The paint, NOx removable road boundary stone, characterized in that a mixture of luminous materials that absorb and emit light.
7. According to claim 1,

   The main body 11 is:

   A block 14 in which a through hole 13 in the longitudinal direction is formed in the central portion;

   A connecting rod 15 that sequentially connects the plurality of bodies 11 by sequentially passing through the adjacent through holes 13 of the block 14;

   NOx removable road boundary stone, characterized in that it comprises a.
8. The method of claim 7,

   The main body 11 or connecting rod 15, NOx removable road boundary stone characterized in that it is molded using low-cost waste synthetic resin as a vegetable by-product chaff, sawdust or a mixture thereof.
9. The method of claim 7,

   The connecting rod 15 is NOx removable road boundary stone characterized in that it is formed in an elliptical shape to prevent any axis rotation of the body (11).
10. The method of claim 8,

    The vegetable by-product, NOx removable road boundary stone, characterized in that mixed with 20-30 parts by weight based on 100 parts by weight of the waste synthetic resin.
11. According to claim 1,

    The coating layer 12 is NOx removable road boundary stone, characterized in that formed on the surface of the body 11 by a double extrusion method.

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