JPH10219920A - Nox purifying extruded construction material and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve NOx purifying efficiency, form an adhesion sufficiently firmly on the surface of a construction material, and manufacture the construction material efficiently. SOLUTION: The NOx purifying extruded construction material 1 has a film layer 3 containing titanium dioxide and having a thickness of 20-500μm on the surface of an extruded cement construction material 2, and irregularities are provided on the surface of the layer 3 and transparent substances may be scattered thereon. And for manufacturing the material 1, extrusion molding cement composition is extruded and composition containing titanium dioxide is applied onto the surface of the extruded cement composition and thereafter irregular patterns are formed on the surface the extruded composition by means of an irregular roll or after extruding the cement composition, irregular patterns are formed on the surface of the extruded composition by means of an irregular toll and then composition containing titanium dioxide is applied to the surface on which irregular patterns are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates NO _X purification extrusion building materials and the manufacturing method thereof, and more particularly simple,
Is efficiently produced, NO _X that can better purification of the NO _X in the air with the titanium-containing coating dioxide can sufficiently adhere
The present invention relates to a purified extrusion building material and a method for producing the same.

[0002]

Pollution Recently, automobile, air quality by NO _X contained in particular in the exhaust gas exiting from diesel vehicles is increasing with increasing number of automobiles, traffic congestion or the like associated therewith. Conventionally, metal oxides have been known as substances that reduce the concentration of NO _X , and among them, titanium dioxide is also known to have a strong photocatalytic action. By utilizing such strong photocatalytic action of titanium dioxide, NO _x
Removing the study recently by mixing titanium dioxide becomes increasingly popular to form a sheet or panel, removing the NO _X with the outer wall of the building is being put into practical use.

[0003]

However, when a conventional building material (for example, an exterior wall) as described above is used, after removing the exterior building material, a new N is used.
O _X should be replaced by pasting the removal sheet, it has been a problem in that it takes time and effort. Although NO _X purifying building materials have been manufactured by a method such as coating the titanium dioxide-containing composition to the surface of the conventional building materials, in the case where the thickness of the titanium dioxide-containing coating layer is thin, the surface of the extruded building materials dioxide Adhesion with the titanium-containing coating layer was another problem. Further, it was necessary to increase the NO _x purification efficiency of this coating layer.

[0004] The present inventors have, for these problems, for building materials NO _X purification adhesion was strongly adhered to the surface of the well extruded construction material with a thin film layer as a titanium dioxide-containing coating layer having a thickness of 20~500μm be obtained, further, etc. Does enhance NO _X purification efficiency of the coating layer is any means per a result of various studies, a structure capable when satisfying the and simultaneously, the surface of the extruded building materials It has been found that it can be obtained by forming irregularities and then providing a titanium dioxide-containing coating on this surface.
The present invention has been made based on these findings.

[0005] Therefore, the present invention
One issue is NO_XImproves purification efficiency and dioxide
Titanium-containing coating layer is adhered to building material surface sufficiently firmly
NO _XIt is to provide a purified extrusion building material. Also book
The second problem to be solved by the invention is to simply and efficiently
Between the building material surface and the titanium dioxide-containing coating
Adhesion is sufficiently strong and NO in the coating layer_XPurification efficiency
Improved NO_XTo provide a method for producing a purified extrusion building material
It is to be.

[0006]

The above objects of the present invention are attained by the following inventions.

[0007] (1) extrusion NO _X purification extrusion building material, characterized in that the surface of the cement building material having a titanium dioxide-containing coating layer having a thickness of 20 to 500 [mu] m. (2) NO _X purification extrusion building material according to the paragraph 1, characterized in that it comprises an uneven surface of the titanium dioxide-containing coating layer side. (3) The N according to the above (1) or (2), wherein a transparent substance is dispersed on the titanium dioxide-containing surface layer.
O _X purification extrusion building materials. (4) extruding a cement composition was extruded, after applying the titanium dioxide-containing composition to the surface, production of the NO _X purification extrusion building materials and forming an uneven pattern in a concavo-convex roll surface Method. (5) After extrusion the extruded cement composition, the uneven pattern is formed in a concavo-convex roll on the surface, then, NO _X purification extrusion, characterized in that the resulting surface is coated with titanium dioxide-containing composition Manufacturing method of molded building materials. (6) the fourth term or manufacturing process of the NO _X purification extrusion building material according to paragraph 5, which comprises spraying a transparent material to titanium dioxide-containing coating layer.

[0008]

NO _X purification extruded construction material of the embodiment of the present invention is characterized in that it has a titanium dioxide-containing coating layer having a thickness of 20~500μm on its surface, thereby building material surface and titanium dioxide-containing coating Strong adhesion with the layer is obtained. The NO _X purification extrusion building material of the present invention, together with and the building material surface and titanium dioxide-containing coating layer adheres firmly by having irregularities on the surface of the titanium dioxide-containing coating layer side, said coating layer having an uneven As a result, the NO _X purification efficiency can be improved. In the present invention,
Can be improved further of the NO _X purification efficiency by a transparent material in the titanium dioxide-containing coating layer is sprayed.

[0009] In addition, the first manufacturing method of the NO _X purification extrusion building material of the present invention, the extruded cement composition was extruded, after applying the titanium dioxide-containing composition on the surface,
An uneven pattern is formed on the surface with an uneven roll. In the second manufacturing method of the NO _X purification extrusion building material of the present invention is also extrusion after the molding cement composition was extruded, the uneven pattern is formed in a concavo-convex roll on the surface, then the titanium dioxide to the resulting surface The coating composition is characterized by applying the composition, and by these manufacturing methods, a NO _X purification extrusion molded material having a film layer firmly bonded can be efficiently manufactured by a simple manufacturing method. Further in the present invention, the surface layer because unevenness is formed, in which excellent effects of improving the NO _X purification efficiency. Preferably, after forming irregularities on the surface, the titanium dioxide-containing composition is applied.

[0010] NO _X purification extrusion building material of the present invention are those having a titanium dioxide-containing coating layer having a thickness of 20~500μm building material surface, extrusion building materials can be prepared by the method of extrusion molding. The material of the extruded building material may be one usually used in the technical field of extruded cement building material, and includes cement and aggregate, and the cement is not particularly limited, and ordinary Portland cement, early-strength Portland cement , Moderate heat Portland cement, super fast Portland cement, sulfate resistant Portland cement, white Portland cement, blast furnace cement, fly ash cement, silica cement,
Alumina cement, super-rapid hardening cement and the like can be mentioned. Examples of the aggregate include mountain sand, river sand, crushed sand, casting sand, and the like.

In the present invention, the titanium dioxide-containing coating layer may be composed of cement or titanium dioxide, or may contain at least one of an aggregate and a transparent substance, and the transparent substance may be sprayed on the coating layer. Is also good. Cement or aggregate may be used for the extrusion building material, and as titanium oxide, titanium dioxide is used, rutile,
And anatase crystal form may be used, but anatase type titanium dioxide having high activity is preferable.
In the present invention, a transparent substance (also referred to as an aggregate having good light transmittance) can be added in order to allow ultraviolet light to penetrate deep into the surface layer and increase purification and absorption efficiency, and can be dispersed on the surface. You may. As the transparent substance, glass beads, glass powder, silica sand and the like can be used. The particle diameter of the glass beads, glass powder and silica sand is desirably 1 to 6 mm. And the strength decreases.

In the present invention, the titanium dioxide-containing coating layer contains titanium dioxide in an amount of 10 to 30% by weight based on the whole coating layer. If the amount is less than 10 parts by weight, the purification efficiency of NO _X is not good, and if it exceeds 30 parts by weight, the purification efficiency of NO _X is not improved any more and the cost is increased, which is not preferable. The thickness of the titanium dioxide-containing coating layer can be changed in the range of 20 to 500 μm depending on the degree of surface irregularities. Preferably, the thickness of the titanium dioxide-containing coating layer is 50 to 500 µm, more preferably 100 to 400 µm. If the thickness is less than 20 μm, the thickness is too thin, and the NO _X purification efficiency is poor. If the thickness exceeds 500 μm, the amount of titanium dioxide used increases, not only the cost increases, but also the NO _X purification efficiency decreases. Does not improve.

In the present invention, the titanium dioxide-containing coating layer comprises:
It may be coated on a flat surface or on a surface having irregularities. Especially when the surface has irregularities, NO _X
Purification efficiency can be further improved, and the irregularities are formed after extrusion molding using an embossing roll or the like. At this time, the depth of the unevenness can be formed beyond the thickness of the titanium dioxide-containing coating layer. In the case of such irregularities can be increased even more of the NO _X purification efficiency by forming to attach the transparent material in the bottom of the recess of the uneven surface. The extruded building material used in the present invention may be either solid or hollow. In the present invention also, NO _X purification extrusion building material is characterized in that produced by extrusion molding, thereby the extrusion building material surface and titanium dioxide-containing coating strongly adhered,
Excellent NO _X purification extrusion building material strength.

NO of the present invention_XHow to manufacture purified extrusion building materials
The method first involves extruding the extruded cement composition or
After extrusion molding, an uneven pattern is formed on this surface with an uneven roll
Then, a titanium dioxide-containing composition is applied to the obtained surface.
It is characterized by being applied. Extrusion cement
The composition is made by kneading cement, aggregate and water.
And a composition containing titanium dioxide,
10 parts by weight to 30 parts by weight of titanium dioxide with respect to 0 parts by weight
Are kneaded with water and extruded with an extruder.
Molding. Extruded building material extruded by extrusion
Form an embossed pattern with an embossing roll on the surface of
A titanium dioxide-containing coating layer is formed. This titanium dioxide
After forming the containing film layer, emboss it with an embossing roll.
It goes without saying that a pattern may be formed. like this
NO manufactured by_XPurifying extruded building materials are usually
Provide curing that can be performed in the technical field. If necessary
Steam curing or high pressure curing may be used. Further, in the above,
The bright substance may be added to the titanium dioxide-containing composition.
Before and after forming the embossed pattern,
You may cloth. This transparent material absorbs a lot of sunlight or
NO because it can be reflected _XGreat removal effect. Two more
By forming irregularities on the titanium oxide-containing surface layer,
Its light absorption can be increased.

Further, if necessary, by adding 0.5 to 20 parts by weight of a coloring pigment to the titanium dioxide-containing composition, the exterior surface can be formed aesthetically.
In the present invention, the titanium dioxide-containing coating layer,
Which does not disturb the NO _X purification effect, can be added NO _X adsorbent material as needed, fibers, pulp, resin emulsion, a colored pigment or the like. In particular, as the NO _X adsorbing material, zeolite, magadiite (Na ₂ Si ₁₄ O ₂₉ n)
H ₂ O), petalite (Li ₂ OAl ₂ O ₃ 8Si)
O ₂ ) can be used, and NO and NO ₂ gas can be adsorbed. The mixing amount of these adsorbing materials is N
O, NO ₂ gas can be an appropriate amount that can be adsorbed, this amount is the cost, the correlation between the amount of cement and titanium oxide, strength,
It can be appropriately determined by a simple test in consideration of purification efficiency and the like.

Hereinafter, the present invention will be described in more detail with reference to the drawings, but the present invention is not limited thereto. FIG. 1 is a perspective view showing a NO _X purification extrusion building material of the present invention. Figure 2 is a cross-sectional view showing a manufacturing method of the NO _X purification extrusion building material of the present invention. In FIG. 1, 1 is
It is a NO _X purification extrusion molding material, and the extrusion molding material 2 includes:
It shows that it is a type having a hollow portion 4. On this building material base layer 2, a titanium dioxide-containing coating layer 3 is provided. This NO _X purification extruded building material is an extruded building material manufactured by extrusion, and the surface of the building material 2 is coated with the titanium dioxide-containing coating layer 3, thereby firmly adhering to the building material surface. , Both are very tightly bound. Although not shown, the coating layer 3 has a large surface area due to the formation of an embossed pattern, so that sufficient light (sunlight) can be absorbed.

FIG. 2A is a cross-sectional view showing a state where an uneven roller is provided after extrusion molding, and FIG. 2B is a cross-sectional view showing a state where an uneven roller is provided before an outlet of a die. In FIG. 2 a, the extruder extrudes the extruded cement composition from a press-fitting pipe 5 for extruding the extruded cement composition for a building material by a screw conveyor 7 to form an extruded building material. After the embossed pattern is formed, the composition containing titanium dioxide is covered with a roller brush 8. Instead of the roller brush 8, spraying with a spray may be used. The obtained NO _X purification extrusion building material is cured as it is.
The order may be reversed. In this case, after the titanium dioxide-containing composition is covered with the roller brush 8, an embossed pattern is formed by the embossing roll 9 and cured. Wherein NO _X by the titanium dioxide-containing surface layer
If it is necessary to improve the purification efficiency, a transparent substance such as glass beads is sprayed.

In FIG. 2B, the press-fit pipe 5 of the extruder is used.
When the uneven roller 9 is arranged in front of the exit of the base 51 and the extrusion is formed simultaneously with the formation of the unevenness, the unevenness is formed on the surface of the obtained extruded building material 2. Then, the titanium dioxide-containing composition is applied to the uneven surface by a roller brush 8 (or spraying by a spray or the like).

[0019]

EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but this is merely an example for describing the present invention, and the present invention is not limited thereto.

[Examples 1 to 6] As a slurry for coating titanium dioxide, a slurry comprising a mixture of 100 parts by weight of Portland cement and 20 parts by weight of water in an amount (% by weight) of titanium oxide shown in Table 1 was formed. did. On the other hand, as a kneaded product for an extrusion molded building material, Portland cement 4
A mixture comprising 0 parts by weight, 40 parts by weight of fine silica sand, 16 parts by weight of wollastonite and 20 parts by weight of water was mixed with 0.1 part by weight of methyl cellulose to produce a kneaded product. Less than,
Using the extruder shown in FIG. 2, the kneaded material for the extruded building material in the press-fitting pipe 5 was extruded by the screw conveyor 7 to form the extruded cement building material 2. Then, the surface of the extruded cement building material 2 was formed with irregularities on the surface of the coating layer by an embossing roll 9 provided in front of the die. Further, the uneven surface was coated with a coating layer containing titanium dioxide to a thickness of 500 μm.

In Examples 2 and 4 among Examples 1 to 4, irregularities were formed in the coating layer containing titanium dioxide.
There was thus produced the NO _X purification extrusion building materials of Examples 1 to 4. Table 1 shows the results of the NO _X removal rates (%) of these building materials.

The method for measuring the NO _X purification performance is described below. Using a flow type NO _X meter manufactured by Monitor Lab, Inc.
The NO _x removal rate was measured according to the principle shown in FIG. Entrance 11
More of the NO concentration 1 ppm NO gas flow per minute 0.3 l, NO and NO ₂ concentration at the outlet 12 after passing through the cell 13 equipped with a specimen 14 is measured, NO _X is removed by the following formula The rate was calculated. The specimen 14 was irradiated with ultraviolet rays having a wavelength of 350 to 370 nm by the black lamp 18 at an intensity of 500 μW / cm ² .

[0023]

【formula】

[0024]

[Table 1]

As is clear from Table 1, all the building materials having a titanium dioxide-containing coating layer have an excellent NO _x removal rate, and the building materials having an uneven surface have a more excellent NO _x removal rate.
_X removal rate. Further comprising an uneven surface, building material having glass beads was also confirmed to have an excellent NO _X removal rate. Since these building materials had irregularities on the surface, it was also confirmed that the building material surface and the coating layer were firmly bonded.

[0026]

NO _X purification extruded building materials obtained by the present invention exhibits not only superior in the NO _X removal efficiency,
Strong adhesion between the surface of the extruded building material and the coating layer can be obtained. The NO _X purification extrusion building material of the present invention has a titanium dioxide-containing coating layer on the surface of the extruded cement building material,
It said coating layer is by having irregularities, thereby improving the NO _X purification efficiency. In the present invention, it is possible to improve even more of the NO _X purification efficiency by a transparent material to titanium dioxide-containing coating layer is sprayed. In the present invention, can have sufficient NO _X purification efficiency even thin layer by the thickness of the titanium dioxide-containing coating layer is 20 to 500 [mu] m.

In the method for producing an extrusion molded building material for NO _X purification according to the present invention, a titanium dioxide-containing coating layer having a thickness of 20 to 500 μm is formed on the surface of the extruded construction material obtained by extrusion molding. in NO _X purification extrusion building material coating layer is firmly bonded can be efficiently produced. Further in the manufacturing process of the NO _X purification extrusion building material of the present invention also, by forming an uneven pattern in a concavo-convex roll to the coating layer, sufficient both adhesion with the NO _X purification extruded construction material can be efficiently manufactured Be strong.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a NO _X purification extrusion building material of the present invention.

FIG. 2 is a cross-sectional view showing an extruder for producing a NO _X purification extrusion building material of the present invention. FIG. 2A shows the case where the uneven roller is provided after the extrusion molding, and FIG. 2B shows the case where the uneven roller is provided before the outlet of the die.

FIG. 3 is a schematic diagram of a flow type NO _X evaluation apparatus for measuring a NO _X removal rate used in the present invention.

[Explanation of symbols]

1 NO _X purification extruded construction material 11 inlet 2 extruded construction material 12 outlet 3 coating layer 13 cell 4 hollow portion 14 specimens 5 pressed tube 15 solenoid valve 7 the screw conveyor 16 meter 8 roller brush 17 standard gas 9 the embossing roll 18 Black Lamp 10 Conveyor

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B32B 33/00 B01D 53/36 ZABJ E04B 1/04 102D

Claims (6)

[Claims] An extruded cement building material having a thickness of 20 to
NO _X purification extrusion building material characterized by having a titanium dioxide-containing coating layer of 500 [mu] m. 2. The extruded NO _X purification building material according to claim 1, wherein the surface on the side of the titanium dioxide-containing coating layer has irregularities. 3. The extrusion-molded NO _X purification building material according to claim 1, wherein a transparent substance is sprayed on the titanium dioxide-containing surface layer. 4. An extruded cement composition is extruded, a titanium dioxide-containing composition is applied to the surface, and an uneven pattern is formed on the surface with an uneven roll.
Method for producing O _X purification extrusion building materials. 5. An extrusion-molded cement composition, during or after extrusion molding, forming an uneven pattern on the surface with an uneven roll, and then applying a titanium dioxide-containing composition to the obtained surface. production process of the NO _X purification extrusion building materials. 6. The N according to claim 4, wherein a transparent substance is sprayed on the titanium dioxide-containing coating layer.
Method for producing O _X purification extrusion building materials.