JP2014161754A - Surface treatment method for honeycomb structure and honeycomb structure using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of satisfactorily identifying characters or indicators of a pattern or the like described in a honeycomb structure before and after the treatment such as supporting of a catalyst.SOLUTION: There is provided a surface treatment method for a honeycomb structure in which a display area is provided by applying a water-repellent oil onto a surface of an outer peripheral wall in a honeycomb structure comprising a honeycomb structural part having a porous partition wall for partitioning a plurality of cells which are flow channels for a fluid and an outer peripheral wall surrounding the honeycomb structural part.

Description

  The present invention relates to a surface treatment method for a honeycomb structure and a honeycomb structure using the same.

  A honeycomb structure formed of porous ceramics has a wide range of uses such as a filter for exhaust gas purification and a carrier for supporting a catalyst for exhaust gas purification (catalyst carrier). For these various uses, in the process of manufacturing the honeycomb structure and the process of distributing the honeycomb structure to the market, it is required to manage product information about each honeycomb structure. Therefore, many techniques for marking a honeycomb structure have been proposed (for example, Patent Documents 1 and 2).

  For example, when a honeycomb structure is used as a catalyst carrier, the honeycomb structure is first manufactured, and then a catalyst metal (for example, Pt, Pd, Rh, etc.) is applied to the partition wall surrounding each cell of the honeycomb structure. It will be supported. Here, when the catalyst metal is supported on the partition walls of the honeycomb structure, a treatment is performed in which a catalyst slurry prepared by dispersing the catalyst metal in the dispersion is poured into the cells of the honeycomb structure. In such a series of processes, in general, a label is previously written on the honeycomb structure prior to the treatment for supporting the catalyst, and further, after the catalyst loading treatment, the honeycomb structure (honeycomb catalyst body) is separately provided. Product information is managed by marking the signs.

  However, in the conventional technique, when the honeycomb structure is subjected to various treatments such as a treatment for supporting the catalyst, the honeycomb structure is discolored, and as a result, the mark written on the honeycomb structure is changed. May be difficult to identify.

  For example, FIG. 1 is a perspective view of a honeycomb structure 200 on which signs are marked by a conventional method. As shown in the drawing, conventionally, letters and designs are written on the surface of the outer peripheral wall 7 of the honeycomb structure 200 [cross mark (×) in FIG. 1], and then a process for supporting the catalyst is performed. It is common to do. Here, when the catalyst is supported, a process of attaching the catalyst to the partition walls 5 is performed by pouring the catalyst slurry in which the catalyst is dispersed into the cell 4. FIG. 2 is a perspective view showing an example of a honeycomb catalyst body 250 obtained by supporting a catalyst on the honeycomb structure 200 shown in FIG. As shown in the figure, in the honeycomb catalyst body 250, the outer peripheral wall 7 is changed to brown color due to the seepage of the catalyst slurry, and the symbols and patterns written on the outer peripheral wall 7 due to the brown color. May be filled in [cross mark (x) in FIG. 2].

International Publication No. 2007/072694 JP 2011-206764 A

  In view of the above problems, an object of the present invention is to make it possible to satisfactorily identify signs such as letters and designs written on a honeycomb structure before and after various processes such as a process for supporting a catalyst. Is to provide.

  The present invention is the following honeycomb structure surface treatment method and a honeycomb structure using the same.

[1] On the surface of the outer peripheral wall of the honeycomb structure including a honeycomb structure portion having porous partition walls that define and form a plurality of cells serving as fluid flow paths, and an outer peripheral wall surrounding the outer periphery of the honeycomb structure portion. A method for treating the surface of a honeycomb structure in which a display region is provided by applying water-repellent oil.

[2] The method for treating a surface of a honeycomb structure according to [1], wherein the water-repellent oil includes at least one selected from the group consisting of silicone oil, machine oil, and grease.

[3] A display region is provided on the surface of the outer peripheral wall of the honeycomb structure by applying water-repellent oil, and then laser light-emitting powder and ceramic raw material powder are formed on a part or all of the display region. The method for treating a surface of a honeycomb structure according to [1] or [2], wherein a laser color development region is provided by applying a laser color development base material including a dispersion medium.

[4] A first step of applying the water repellent oil to a transfer region on the surface of the applicator to form a coating film containing the water repellent oil in the transfer region; and the transfer region of the applicator. Is applied to the surface of the outer peripheral wall of the honeycomb structure, and the coating film is transferred to the surface of the outer peripheral wall, whereby the water repellent oil is applied to the surface of the outer peripheral wall and the display is performed. A method for treating the surface of a honeycomb structure according to [1] or [2], further comprising a second step of providing a working region.

[5] In the first step, the water-repellent oil is applied to the transfer region, and then a laser coloring base material including a laser emitting powder, a ceramic raw material powder, and a dispersion medium is applied, and the transfer is performed. Forming the coating film containing the water-repellent oil and the laser coloring base material in a region for use, and in the second step, the transfer region of the applicator is formed on the outer peripheral wall of the honeycomb structure. Applying the water-repellent oil and the laser coloring base material to the surface of the outer peripheral wall by transferring the coating film onto the surface of the outer peripheral wall against the surface, the display area and the The method for treating a surface of a honeycomb structure according to [4], wherein a laser color development region is provided in the display region.

[6] A honeycomb structure obtained by using the surface treatment method for a honeycomb structure according to any one of [1] to [5].

  According to the honeycomb structure surface treatment method of the present invention and the honeycomb structure using the honeycomb structure, the treatment for supporting the catalyst by applying water-repellent oil to the display area on the outer peripheral wall surface of the honeycomb structure. When processing various processes such as catalyst slurry, it is difficult for the processing liquid such as catalyst slurry to ooze into the display area on the outer peripheral wall surface, and as a result, the discoloration caused by the processing liquid is suppressed in the display area on the outer peripheral wall surface. can do. That is, according to the surface treatment method of a honeycomb structure of the present invention and the honeycomb structure using the honeycomb structure, the display of the outer peripheral wall surface can be performed even when a treatment that can cause discoloration to the outer peripheral wall surface of the honeycomb structure is performed. Since discoloration can be suppressed in the display area, if characters or designs are written in the display area, the characters or designs can be identified well before and after the processing such as catalyst loading.

It is a perspective view of the honeycomb structure in which the label | marker was described by the conventional method. FIG. 2 is a perspective view of a honeycomb catalyst body obtained by supporting a catalyst on the honeycomb structure shown in FIG. 1. 1 is a perspective view of a specific example of a honeycomb structure obtained by an embodiment of a surface treatment method for a honeycomb structure of the present invention. FIG. 4 is a cross-sectional view taken along line A-A ′ in FIG. 3. Fig. 4 is a perspective view of a honeycomb catalyst body obtained by supporting a catalyst on the honeycomb structure shown in Fig. 3. FIG. 6 is a perspective view schematically showing a case where characters and symbols are written in a blank space in the display area of the honeycomb catalyst body shown in FIG. 5. FIG. 5 is a perspective view of a specific example of a honeycomb structure obtained by another embodiment of a surface treatment method for a honeycomb structure of the present invention. FIG. 8 is a perspective view of a honeycomb catalyst body obtained by supporting a catalyst on the honeycomb structure shown in FIG. 7. It is a schematic diagram showing an example of an applicator that can be used in an embodiment of a surface treatment method for a honeycomb structure of the present invention. FIG. 10 is a schematic diagram showing an embodiment of a surface treatment method for a honeycomb structure of the present invention using the applicator shown in FIG. 9.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and changes, modifications, and improvements can be added without departing from the scope of the present invention.

  FIG. 3 is a perspective view of a specific example of the honeycomb structure 100 obtained by the embodiment of the surface treatment method of the honeycomb structure of the present invention. FIG. 4 is a cross-sectional view taken along the line A-A ′ in FIG. 3. Referring to these drawings, the honeycomb structure surface treatment method of the present embodiment includes a honeycomb structure portion having porous partition walls 5 for partitioning a plurality of cells 4 serving as fluid G flow paths, and a honeycomb structure. This is a technique characterized in that the display region 10 is provided by applying water-repellent oil on the surface of the outer peripheral wall 7 of the honeycomb structure 100a including the outer peripheral wall 7 surrounding the outer periphery of the structure portion.

  FIG. 5 is a perspective view of a honeycomb catalyst body 150a obtained by supporting a catalyst on the honeycomb structure 100a shown in FIG. According to the honeycomb structure surface treatment method of the present embodiment, when the catalyst is supported on the honeycomb structure 100a, the catalyst slurry (by the action of the water repellent oil applied to the display region 10) It is possible to prevent the treatment liquid) from seeping into the display region 10 of the outer peripheral wall 7 of the honeycomb structure 100a. As a result, as shown in FIG. 5, in the honeycomb catalyst body 150a obtained through the catalyst loading process, discoloration in the display region 10 of the outer peripheral wall 7 can be suppressed.

  Therefore, according to the honeycomb structure surface treatment method of the present embodiment, characters and designs are written in the display region 10 of the honeycomb structure 100a [cross mark (×) in FIG. 3], and thereafter Even in the case where the treatment for supporting the catalyst is performed, in the honeycomb catalyst body 150a obtained through such treatment, it is possible to still satisfactorily identify the characters and designs written in the display region 10. [Cross mark (x) in FIG. 5].

  Examples of the water-repellent oil that can be used in the honeycomb structure surface treatment method of the present embodiment include those containing at least one selected from the group consisting of silicone oil, machine oil, and grease. Among those listed here, from the viewpoint of little influence on the surface of the outer peripheral wall 7 of the honeycomb structure 100a, the water-repellent oil is composed of one or more selected from the group consisting of silicone oil, machine oil, and grease. More preferably, it is more preferably made of silicone oil.

  FIG. 6 is a perspective view schematically showing a case where characters and symbols are written in the margin 15 in the display region 10 of the honeycomb catalyst body 150a shown in FIG. In the honeycomb structure surface treatment method of the present embodiment, when the water-repellent oil is at least one selected from the group consisting of silicone oil, machine oil, and grease, the surface of the outer peripheral wall 7 is affected by the water-repellent oil. Since it is suppressed, it is possible to write characters, designs, and the like in the margin 15 in the display region 10 of the honeycomb catalyst body 150a by simple means such as ink.

In addition, in the honeycomb structure surface treatment method of the present embodiment, the treatment liquid such as catalyst slurry is sufficiently oozed into the display region 10 while suppressing the influence on the surface of the outer peripheral wall 7 of the honeycomb structure 100a. From the viewpoint of reducing the amount of water repellent oil per unit area [total amount of water repellent oil applied to display area (g) / area of display area (cm ² )] is 0.05. is preferably ~50.0g / cm ^2, further more preferably 0.15~1.50g / cm ^2.

  In the honeycomb structure surface treatment method of the present embodiment, there is no particular limitation on the method of applying water-repellent oil to the outer peripheral wall 7 of the honeycomb structure 100a. Examples of the surface treatment method for a honeycomb structure according to the present embodiment include a method using a brush, a method using a stamp, a spray method, an ink jet method, and the like.

  In the honeycomb structure surface treatment method of the present embodiment, the honeycomb structure 100 as an object is not particularly limited as long as it includes a honeycomb structure portion having porous partition walls 5 and an outer peripheral wall 7. Absent. In particular, the surface treatment method for a honeycomb structure of the present embodiment is suitable for the honeycomb structure 100 used as a catalyst carrier for supporting a metal catalyst for exhaust gas purification. Examples of the material of the partition walls 5 and the outer peripheral wall 7 of the honeycomb structure 100 include, for example, cordierite, silicon carbide, silicon-silicon carbide based composite material, mullite, alumina, aluminum titanate, silicon nitride, and silicon carbide-cordierite. Examples thereof include those composed mainly of a composite material. The “main component” in the present specification means containing 50% by mass or more. For example, the partition wall 5 containing cordierite as a main component means that the partition wall 5 contains 50% by mass or more of cordierite. Further, in the honeycomb structure surface treatment method of the present embodiment, the outer peripheral wall 7 of the honeycomb structure 100 as an object may be porous.

  FIG. 7 is a perspective view of a specific example of the honeycomb structure 100b obtained by another embodiment of the surface treatment method for a honeycomb structure of the present invention. Referring to FIG. 7, in the honeycomb structure surface treatment method of the present embodiment, the display region 10 is provided by applying water-repellent oil to the surface of the outer peripheral wall 7 of the honeycomb structure 100b. This is a technique characterized in that a laser color development region 20 is provided on a part or all of the display region 10 by applying a laser color development base material containing a laser emission powder, a ceramic raw material powder, and a dispersion medium.

  FIG. 8 is a perspective view of a honeycomb catalyst body 150b obtained by supporting a catalyst on the honeycomb structure 100b shown in FIG. Also in the honeycomb structure surface treatment method of the present embodiment, the catalyst slurry (treatment liquid) is prevented from seeping out into the display area 10 (including the laser coloring area 20) by the action of the water repellent oil. Is possible. Therefore, in the honeycomb catalyst body 150b, it is possible to suppress discoloration of the outer peripheral wall 7 in the display region 10, and as a result, the discoloration in the display region 10 is performed before the processing for supporting the catalyst. Characters, designs, and the like can still be well identified in the honeycomb catalyst body 150a [stars (*) in FIG. 7 and FIG. 8].

  Further, in the honeycomb structure 100b (or the honeycomb catalyst body 150b) obtained by the present embodiment, when laser light is irradiated into the laser color development region 20 of the outer peripheral wall 7, the portion irradiated with the laser light is colored. Can do. For example, when irradiating laser light into the laser color development region 20 of the outer peripheral wall 7 of the honeycomb structure 100b (or the honeycomb catalyst body 150b), the laser irradiation position is moved in such a manner as to draw characters or designs. In addition, as shown by a double circle (）) shown in FIG. 8, it is possible to mark a mark such as a character or a pattern in the laser color development region 20.

  Thus, when characters or designs are written in the laser color development region 20 by the laser light irradiation, even if the outer peripheral wall 7 of the honeycomb structure 100b (or the honeycomb catalyst body 150b) is rubbed, the characters made of ink or the like. There is an advantage that it is hard to disappear compared to and designs.

  In the present embodiment, the laser coloring powder that can be used as a material for the laser coloring base material is a property that develops a dark color (for example, black, brown, green, indigo, purple, etc.) by irradiation with a laser (for example, an infrared laser). A metal powder or a metal compound powder. In this embodiment, the laser coloring powder that can be used as the material for the laser coloring base material is, for example, one or more kinds of metal or metal compound particles selected from the group consisting of silicon carbide, silicon, titania, and aluminum nitride. The powder to contain can be mentioned.

  In the present embodiment, the ceramic raw material powder that can be used as the material for the laser coloring base material means an inorganic powder that is a ceramic raw material. In this embodiment, the ceramic raw material powder that can be used as the material for the laser coloring base material is, for example, selected from the group consisting of cordierite raw material powder, silicon nitride, alumina, mullite, zirconia, zirconium phosphate, and aluminum titanate. Mention may be made of powders containing more than one kind of inorganic particles.

  In the present embodiment, the dispersion medium that can be used as the material for the laser coloring base material is not particularly limited as long as it is a liquid that can be made into a slurry state by mixing with the laser coloring powder and the ceramic raw material powder. . In the present embodiment, examples of the dispersion medium that can be used as a material for the laser coloring base material include water.

  In the laser coloring base material used in the present embodiment, it is preferable that 20 to 400 parts by mass of the laser coloring powder is contained with respect to 100 parts by mass of the ceramic raw material powder. For example, when the amount of the laser coloring powder is 20 parts by mass or more, it becomes possible to reliably obtain a sufficient color by laser irradiation, and when the amount of the laser coloring powder is 400 parts by mass or less, It becomes possible to reliably maintain thermal shock resistance.

  In the laser coloring base material used in this embodiment, the amount of the laser coloring powder is 100% from the viewpoint of increasing the distinguishability of the label generated by laser irradiation (increasing the contrast between the colored portion and the non-colored portion). More preferably, it is 50-200 mass parts with respect to a mass part, and it is most preferable that it is 100-200 mass parts.

  In addition, when the laser color development region 20 is provided in the display region 10 as in the honeycomb structure surface treatment method of the present embodiment, it is easy to arbitrarily select a method of labeling with characters or designs. From the viewpoint, it is preferable to provide the laser color development region 20 in a part of the display region 10. In other words, when the laser color development region 20 is provided in the display region 10, it is preferable to provide a region other than the laser color development region 20 in the display region 10. Thus, by providing a region that is not the laser coloring region 20 in the display region 10, that is, a region that is not coated with the laser coloring base material, even if the ink is not compatible with the laser coloring base material, Characters and designs can be easily labeled in a region that is not the laser coloring region 20 in the display region 10 [for example, an asterisk (*) in FIG. 7 and FIG. 8 is marked. See area].

  FIG. 9 is a schematic view showing an example of an applicator 50 that can be used in an embodiment of the honeycomb structure surface treatment method of the present invention. As shown in the drawing, a part of the surface of the applicator 50 is recessed in a substantially complementary manner with the shape of the outer peripheral wall 7 of the honeycomb structure 100. Then, the recessed area of the surface of the applicator 50 is used as the transfer area 55.

  FIG. 10 is a schematic view showing an embodiment of a surface treatment method for a honeycomb structure of the present invention using the applicator 50 shown in FIG. Referring to FIG. 10, in the honeycomb structure surface treatment method of the present embodiment, the water repellent oil is applied to the transfer region 55 on the surface of the applicator 50, and the transfer region 55 contains the water repellent oil. The first step of forming the coating film 60, and the transfer region 55 of the applicator 50 is applied to the surface of the outer peripheral wall 7 of the honeycomb structure 100, and the coating film 60 is transferred to the surface of the outer peripheral wall 7. And a second step of providing the display region 10 by applying water-repellent oil on the surface of the wall 7.

  When the applicator 50 is used as in the honeycomb structure surface treatment method of the present embodiment, the outer peripheral wall 7 of the honeycomb structure 100 is adjusted by adjusting the amount of water-repellent oil applied to the transfer region 55. It is preferable because the amount of water-repellent oil applied to can be easily adjusted.

  When providing the laser color development region 20 using the applicator 50 as in the honeycomb structure surface treatment method of the present embodiment, first, water-repellent oil is applied to the transfer region 55 in the first step. Next, a laser color developing base material including laser light emitting powder, ceramic raw material powder, and dispersion medium is applied to form a coating film 60 including water repellent oil and laser color forming base material in the transfer region 55. .

  Subsequently, in the second step, the transfer region 55 of the applicator 50 is applied to the surface of the outer peripheral wall 7 of the honeycomb structure 100, and the coating film 60 is transferred to the surface of the outer peripheral wall 7. A water repellent oil and a laser coloring base material are applied to the surface of the outer peripheral wall 7. Thus, finally, it becomes possible to provide the display region 10 on the surface of the outer peripheral wall 7 of the honeycomb structure 100 and further provide the laser color development region 20 in the display region 10.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to these Examples.

(Honeycomb structure)
(Examples 1-6)
To the cordierite raw material powder blended so that the composition after firing becomes the theoretical composition of cordierite (2MgO · 2Al ₂ O ₃ · 5SiO ₂ ), a molding aid, a pore former, and water are added, mixed, and kneaded. A clay was prepared. The obtained kneaded material was extrusion-molded to prepare a honeycomb molded body (one obtained by integrally molding partition walls and outer peripheral walls), and the honeycomb molded body was dried and fired to prepare a honeycomb structure. The obtained honeycomb structure had a cylindrical shape with a diameter of 118.4 mm and a length of 101.6 mm, a porosity of 35%, a partition wall thickness of 0.1 mm, and a cell density of 62.0 cells / cm ^2. It was.

An applicator recessed in an arc shape was prepared substantially complementary to the outer peripheral wall of the honeycomb structure described above. The surface of the applicator that is recessed in an arc shape is used as a transfer region, and in this transfer region, water repellent oil (silicone oil) is applied to each of Examples 1 to 6 as shown in Table 1. A coating film was formed by coating at [the coating amount per unit area (g / cm ² ), the total coating amount (g)].

  Subsequently, the transfer region of the applicator is pressed against a predetermined position (a reading position of a two-dimensional code reader described later) on the outer peripheral wall of the honeycomb structure, and the coating film of water repellent oil is transferred and dried. A rectangular display area (60 mm long × 60 mm wide) was provided on the outer peripheral wall of the honeycomb structure.

  Next, the same two-dimensional code (data matrix code) is labeled in the display region using an ink jet printer, whereby the honeycomb structure with the two-dimensional code of Examples 1 to 6 (hereinafter referred to as “marked”). Honeycomb structure ") was obtained. In Examples 1 to 6, it was possible to satisfactorily label with ink in the display area (indicated in the column “Labeling with ink” in Table 1).

(Comparative Example 1)
For a honeycomb structure similar to that used in Example 1, a square (60 mm long × 60 mm wide) frame is drawn at a predetermined position on the outer peripheral wall (a reading position of a two-dimensional code reader described later). A labeled honeycomb structure of Comparative Example 1 was obtained by marking the same two-dimensional code (data matrix code) as that of Example 1 using an ink jet printer in the pseudo display area as a display area. .

  Subsequently, against the honeycomb structure similar to that used in Example 1, the transfer area of the applicator was pressed against a predetermined position of the outer peripheral wall (a reading position of a two-dimensional code reader described later), The base film for laser color development is transferred, naturally dried at 25 ° C. for 24 hours, and further subjected to heat treatment at 600 ° C. for 1 hour using an electric furnace, whereby a rectangular structure is formed on the outer peripheral wall of the honeycomb structure. A laser display area (length 35 mm × width 45 mm) was provided.

  In this laser display area, an attempt was made to label the same two-dimensional code (data matrix code) as in Example 1 using an ink jet printer, and the ink repelled in the laser display area. It was impossible to label a complete two-dimensional code (data matrix code) (in the column “Labeling with ink” in Table 1).

Therefore, the same two-dimensional code (data matrix code) as that in Example 1 is labeled on the laser display area under the conditions of an output of 20 W and a scanning speed of 500 mm / s using a CO ₂ laser marker, and a comparative example. 1 labeled honeycomb structure was obtained.

(Catalyst loading)
Eight labeled honeycomb structures of Examples 1 to 6 and Comparative Example 1 were prepared, and catalyst slurry (200 g / L) was poured into the cells of these labeled honeycomb structures. Next, the catalyst slurry poured into the cell was discharged, dried and heat-treated (600 ° C., 1 hour) to obtain a honeycomb catalyst body. When the catalyst slurry was poured into the cells of the labeled honeycomb structure, the presence or absence of the catalyst slurry in the display area, the pseudo display area, and the laser display area was observed. For each of the labeled honeycomb structures of Examples 1 to 6 and Comparative Example 1, the ratio (%) of the total of 8 bodies in which no seepage was observed was shown in Table 1. Shown in the column. Note that “exudation” means a part in the display area (pseudo display area, laser display area) [some parts that do not affect the reading of the two-dimensional code (data matrix code). Including "includes those in which exudation was observed.

(Reading signs)
For the honeycomb catalyst bodies of Examples 1 to 6 and Comparative Example 1 (total of 8 bodies each) obtained by the catalyst loading described above, a two-dimensional code (data matrix) is used using a two-dimensional code reader conforming to ISO / IEC15415. Code). For each of the labeled honeycomb structures of Examples 1 to 6 and Comparative Example 1, the percentage (%) of the accurate readings is shown in the “Reading” column of Table 1.

(Impact)
If the coating amount of the water repellent oil is large, the catalyst slurry is repelled more than necessary, and as a result, an appropriate amount of catalyst may not be supported on the honeycomb catalyst body. Therefore, “not affected” is given if the coating amount is a level at which an appropriate amount of catalyst can be supported on the honeycomb catalyst body, and “influenced” if the coating amount is a level at which an appropriate amount of catalyst cannot be supported.

(Discussion)
In Examples 1 to 6, when the catalyst was loaded, the suppression of the catalyst slurry exudation in the display region was 75% or more. In particular, in Examples 2 to 6, the suppression of the exudation was 100%. It was. By suppressing such bleeding, in Examples 1 to 6, the accurate reading of the two-dimensional code (data matrix code) written in the display area is 75% or more. In particular, in Examples 2 to 6, The accurate reading of the two-dimensional code (data matrix code) was 100%. Moreover, in Examples 1-6, it turned out that it can label | mark well with an ink. As described above, Examples 1 to 6 can be labeled in the display area by a simple means such as ink, and the two-dimensional code (data matrix code) written in the display area is accurate. It was found that reading was also possible with high frequency.

  The present invention can be used when manufacturing a honeycomb structure for a catalyst carrier.

2: end face, 2a: inflow side end face, 2b: discharge side end face, 4: cell, 5: partition wall, 7: outer peripheral wall, 10: display area, 15: margin, 20: laser coloring area, 50: applicator 55: transfer region, 60: coating film, 100: honeycomb structure, 100a, 100b: honeycomb structure, 150: honeycomb catalyst body, 150a, 150b: honeycomb catalyst body, 200: honeycomb structure, 250: honeycomb touch Medium.

Claims (6)

  The surface of the outer peripheral wall of the honeycomb structure having a honeycomb structure part having a porous partition wall that defines a plurality of cells serving as fluid flow paths and an outer peripheral wall surrounding the outer periphery of the honeycomb structure part is provided with water repellency. A method for treating the surface of a honeycomb structure in which a display region is provided by applying oil.   The surface treatment method for a honeycomb structure according to claim 1, wherein the water repellent oil includes one or more selected from the group consisting of silicone oil, machine oil, and grease.   A display region is provided on the surface of the outer peripheral wall of the honeycomb structure by applying water-repellent oil, and then laser light emitting powder, a ceramic raw material powder, a dispersion medium, and a part or all of the display region are provided. The method for treating a surface of a honeycomb structure according to claim 1 or 2, wherein a laser color development region is provided by applying a laser color development base material containing the above. A first step of applying the water-repellent oil to the transfer region on the surface of the applicator to form a coating film containing the water-repellent oil in the transfer region;
The transfer region of the applicator is applied to the surface of the outer peripheral wall of the honeycomb structure, and the coating film is transferred to the surface of the outer peripheral wall, whereby the repellent property is applied to the surface of the outer peripheral wall. A surface treatment method for a honeycomb structure according to claim 1 or 2, further comprising a second step of applying the aqueous oil to provide the display area. In the first step, the water-repellent oil is applied to the transfer region, and then a laser coloring base material including a laser emitting powder, a ceramic raw material powder, and a dispersion medium is applied to the transfer region. Forming the coating film containing the water-repellent oil and the laser coloring base material;
In the second step, the outer peripheral wall is transferred by applying the transfer region of the applicator to the surface of the outer peripheral wall of the honeycomb structure and transferring the coating film to the surface of the outer peripheral wall. The surface treatment method for a honeycomb structure according to claim 4, wherein the water repellent oil and the laser coloring base material are applied to the surface of the substrate, and the laser coloring area is provided in the display area and the display area. .   A honeycomb structure obtained by using the surface treatment method for a honeycomb structure according to any one of claims 1 to 5.