JP6144451B2 - How to select paint for repair - Google Patents

Description

The present invention relates to a method for selecting a repair paint for repairing a head of a nail (a nail head) or a damaged portion for fastening a building material such as an exterior material or a member so as not to be noticeable.

  Conventionally, an enamel coating is formed on the surface of a ceramic building material to form an enamel coating, and then a transparent clear coating is formed on the surface of the enamel coating. In addition, ceramic building materials are fixed to the base such as the torso by driving a fixture such as a nail from the surface. In this case, the head of the fixture such as a nail head is exposed on the surface of the ceramic building material. As a result, the appearance of the building was damaged. In addition, the surface of ceramic building materials may be damaged at the time of transportation or construction, and the damaged appearance may be damaged by the damaged portion. Therefore, a repair coating is used to repair the head of the fixture and the damaged part so as not to be noticeable (see, for example, Patent Document 1). This repair paint uses the enamel paint formed on the surface of the ceramic building materials as it is. The repair paint is applied slightly larger than the head and the damaged part of the fixture, and is applied to the surface of the clear coating on the ceramic building material so as to cover the head and the damaged part of the fixture. Is.

JP 2000-087564 A

  However, when the repair coating is applied as described above, the coating film of the repair coating becomes conspicuous over time, and the appearance of the building may deteriorate. The reason for this is that although the clear coating has become more transparent due to smoothing and moisture absorption, the color of the repair paint hardly changes over time, even though the appearance is slightly blacker than the original construction. This is probably because of this. Therefore, the appearance of the enamel paint on the surface of ceramic building materials covered with clear paint and the repair paint not covered with clear paint are different, and the paint of the repair paint stands out with time. It is done.

The present invention has been made in view of the above points, and an object of the present invention is to provide a method of selecting a repair paint that can make a repaired portion inconspicuous even with a change with time.

The method for selecting a repair paint according to the present invention is a method for selecting a repair paint for use in a colored coating structure in which a clear coating film that is transparent on the outermost surface and changes with time is formed of an inorganic resin paint. The L * value of the L * a * b * color system defined by JIS Z 8729 is 45 or less, and the difference from the L * value of the colored coating structure is −1 or more and 0. It is characterized by being less than.

  The repair coating material preferably contains an acrylic resin and has a pigment weight content of 15 to 30%.

  The repair coating material preferably contains a fluororesin and has a pigment weight content of 15 to 40%.

  The repair coating material preferably contains an inorganic substance having a polysiloxane skeleton and has a pigment weight content of 15 to 40%.

  According to the present invention, the repaired portion can be made inconspicuous even with a change with time.

It is a schematic sectional drawing which shows an example of embodiment of this invention.

  Hereinafter, modes for carrying out the present invention will be described.

  As the repair paint of the present invention, an enamel paint containing a pigment can be used. In this case, the painting work at the time of repair is one coat (one time), and the labor for repair is small, which is economical. For example, a pigment can be blended with an acrylic resin paint mainly composed of an acrylic resin to obtain a repair paint. In addition, a pigment can be blended with a fluororesin paint mainly composed of a fluororesin to form a repair paint. In addition, a pigment can be blended with an inorganic paint mainly composed of an inorganic substance having a polysiloxane skeleton to form a repair paint. Furthermore, a pigment can be blended with an acrylic silicon resin paint mainly composed of an acrylic silicon resin to provide a repair paint.

  It is preferable that said repair coating material has a pigment weight content (PWC) of 15% or more. Thereby, the concealment property of the coating material for repair can be improved. In order to further improve the concealability of the repair coating material, the pigment content is preferably 20% or more. In addition, the paint for repairing using the acrylic resin paint or the acrylic silicon resin paint preferably has a pigment weight content of 30% or less, and the paint for repairing using the fluororesin paint or the inorganic paint is pigment weight content. Is preferably 40% or less. Thereby, the difference in weather resistance between the repaired portion and the portion other than the repaired portion can be reduced, and the repaired portion can be less conspicuous due to secular change. In order to make the repaired portion less noticeable due to secular change, the pigment weight content is preferably 20% or less. The pigment weight content (PWC) is calculated by [(pigment content of repair coating) / (weight of solid content of repair coating)] × 100.

  The above-described repair paint can be used for repair of a colored paint structure. Examples of the colored coating component include ceramic building materials. Examples of ceramic building materials include exterior materials such as outer wall materials and accessories. As shown in FIG. 1, such a colored coating component A is formed by providing a cosmetic coloring layer 2 on the surface of the substrate 1 and providing a transparent clear coating film 3 on the surface of the coloring layer 2. Is. In the case of a ceramic building material, the base material 1 can be formed of a ceramic base material mainly composed of cement, and the colored layer 2 can be formed of a coating film of enamel paint or the like. The clear coating film 3 can be formed of an acrylic resin paint, an acrylic silicon resin paint, a fluorine resin paint, an inorganic resin paint, or the like.

  The repair paint is applied to the repaired portion of the colored coating structure. This repaired part means the head (such as a nail head) of the fixing tool and its surrounding part when the colored coating component is fixed to a base such as a trunk edge with a fixing tool such as a nail. The peripheral part of the head of the fixture means, for example, a circular part having a diameter of about 7 mm centered on the head of the fixture. Moreover, the damaged part of a colored coating structure can also be used as a repair part. In this case, the repair coating is applied not only to the damaged part but also to the peripheral part of the damaged part. Therefore, as shown in FIG. 1, the repair coating film 4 formed with the dry cured product of the repair coating is formed on the surface of the clear coating film 3 in the repair portion.

  Then, the above-described repair coating material has a difference ΔL * between the L * value of the surface of the colored coating component and the L * value of the surface of the repair coating film immediately after the repair coating film is formed and after 3 days. The value is -1 or more and less than 0. That is, the resin type of the paint for repair is such that the surface of the repair coating film is lighter and darker than the surface of the colored coating structure between immediately after the repair coating film is formed and after 3 days. And the pigment content and the like. Thereby, in 1 to 3 months after the repair coating film is formed, the blackness of the clear coating film increases, and the L * value of the surface of the colored coating composition and the L * value of the surface of the repair coating film The difference is almost eliminated and the repaired part can be made inconspicuous. Here, the L * value is an L * value of the L * a * b * color system defined in JIS Z 8729. The L * value can be measured using a commercially available colorimeter. Moreover, the L * value of the colored coating structure before forming the repair coating film is 45 or less, and in this case, the repaired portion can be made inconspicuous especially even with aging. In addition, the L * value of a colored coating structure should just be 20 or more. In addition, the difference ΔL * value between the L * value of the surface of the colored coating composition and the L * value of the surface of the repair coating film is less than −1 immediately after the repair coating film is formed and after 3 days. In the case where it is larger than 0, the repaired portion becomes noticeable immediately after the repair coating film is formed until 3 days later, and the appearance is deteriorated. In addition, when the difference ΔL * value between the L * value of the surface of the colored coating composition and the L * value of the surface of the repair coating is between 0 and 3 days after forming the repair coating, Although the repaired portion is not noticeable immediately after the repair coating film is formed until 3 days later, it is not preferable because the repaired portion becomes conspicuous and the appearance deteriorates due to the change over time.

  Hereinafter, the present invention will be specifically described by way of examples.

Example 1
A ceramic building material was used as the colored coating composition. This colored coating structure has a colored layer of enamel paint on the surface of a substrate, and a clear coating film of an inorganic resin paint on the surface of the colored layer. Further, the L * value of the surface of the colored coating composition was 30 as measured with a color difference meter (CR400, Konica Minolta). A paint for repairing was prepared by blending an acrylic resin paint (“V Seran # 200-9” manufactured by DNT) with pigments (three types of titanium oxide, iron oxide, and carbon black) at 15% PWC. Next, the repair coating was applied to the surface of the clear coating to form a repair coating having a thickness of 30 μm. Next, the L * value of the surface of the repair coating film immediately after the formation of the repair coating film was measured with the above color difference meter, and the difference ΔL * value from the L * value of the surface of the colored coating composition was determined. As a result, the ΔL * value was −0.3.

  Thereafter, [color appearance difference due to blackening of colored coating structure over time], [weathering deterioration difference] and [concealment] were evaluated.

  [Color appearance difference due to blackening of colored coating structure over time] is the L * value of the repaired part (part where the repair coating film is formed) of the colored coating structure after exposure for 1 month on the south side of the vertical plane and other than the repaired part The difference from the L * value was “X” when the ΔL * value was 1.5 or more, and “◯” within that range.

  [Weather resistance degradation difference] is the difference ΔL * value between the L * value of the repaired part of the colored coating structure (part where the repair coating film was formed) and the L * value of other parts than the repaired part after 2 years of exposure in the Okinawa area Is 3 or more.

  [Concealment] was visually confirmed with a 10 mil applicator on the black-and-white concealment paper after the repair coating was applied. When there was a see-through, it was rated as “X”, when it was slightly see-through, “△”, and when there was no see-through, it was marked “◯”.

(Example 2)
Example 1 was repeated except that the pigment was changed to PWC 30%. In Example 2, the composition of the pigment (mixing ratio of titanium oxide, iron oxide and carbon black) was changed from that in Example 1. Therefore, Example 1 and Example 2 have the same ΔL * value but different PWC.

(Example 3)
Example 2 was repeated except that the ΔL * value was set to -1. In Example 3, the composition of the pigment (mixing ratio of titanium oxide, iron oxide, and carbon black) was changed from that in Example 2. Therefore, Example 2 and Example 3 have the same PWC but different ΔL * values.

Example 4
The same procedure as in Example 2 was performed, except that a colored coating structure having an L * value of 45 was used and the ΔL * value was set to −0.1. In Example 4, the composition of the pigment (mixing ratio of titanium oxide, iron oxide and carbon black) and the L * value of the colored coating composition were changed from those in Example 2. Therefore, Example 2 and Example 4 have the same PWC but different ΔL * values.

(Example 5)
The same procedure as in Example 4 was performed, except that a colored coating structure having an L * value of 45 was used and the ΔL * value was set to -1. In Example 5, the composition of the pigment (mixing ratio of titanium oxide, iron oxide, and carbon black) was changed from that in Example 4. Therefore, Example 4 and Example 5 have the same PWC but different ΔL * values.

(Example 6)
The same procedure as in Example 3 was performed except that a colored coating structure having an L * value of 20 was used and the ΔL * value was set to -1. In Example 6, the composition of the pigment (mixing ratio of titanium oxide, iron oxide, and carbon black) was changed from that in Example 3. Therefore, although Example 3 and Example 6 differ in the L * value of a coloring coating structure, PWC and (DELTA) L * value are the same.

(Example 7)
The same procedure as in Example 1 was performed except that an inorganic coating material (“MC-T440” manufactured by Panasonic Electric Works Chemical Research Laboratory) was used instead of the acrylic resin coating material.

(Example 8)
Example 7 was repeated except that the pigment was changed to PWC 30%. In Example 8, the composition of the pigment (mixing ratio of titanium oxide, iron oxide and carbon black) was changed from that in Example 7. Therefore, Example 7 and Example 8 have the same ΔL * value but different PWC.

Example 9
Example 7 was repeated except that the pigment was changed to PWC 40%. In Example 9, the composition of the pigment (mixing ratio of titanium oxide, iron oxide, and carbon black) was changed from that in Example 7. Therefore, Example 7 and Example 9 have the same ΔL * value but different PWCs.

(Example 10)
The same procedure as in Example 1 was performed except that a fluororesin paint (“V Freon # 200” manufactured by DNT) was used instead of the acrylic resin paint.

Example 11
Example 10 was repeated except that the pigment was changed to PWC 30%. In Example 11, the composition of the pigment (mixing ratio of titanium oxide, iron oxide, and carbon black) was changed from that in Example 10. Therefore, Example 10 and Example 11 have the same ΔL * value but different PWCs.

(Example 12)
Example 11 was repeated except that the ΔL * value was set to -1. In Example 12, the composition of the pigment (mixing ratio of titanium oxide, iron oxide, and carbon black) was changed from that in Example 11. Therefore, Example 11 and Example 12 have the same PWC, but have different ΔL * values.

(Example 13)
Example 10 was repeated except that the pigment was changed to PWC 40%. In Example 13, the composition of the pigment (mixing ratio of titanium oxide, iron oxide, and carbon black) was changed from that in Example 10. Therefore, Example 10 and Example 13 have the same ΔL * value but different PWCs.

(Example 14)
The same procedure as in Example 1 was performed except that an acrylic silicon resin (“V-Selang silicon mild” manufactured by DNT) was used instead of the acrylic resin paint.

(Example 15)
Example 14 was repeated except that the pigment was changed to PWC 30%. In Example 15, the composition of the pigment (mixing ratio of titanium oxide, iron oxide, and carbon black) was changed from that in Example 14. Therefore, Example 14 and Example 15 differ in both ΔL * value and PWC.

(Comparative Example 1)
As the colored coating composition, the same L * value on the surface as 80 was used, and the same procedure as in Example 1 was performed except that the pigment was PWC 40%.

(Comparative Example 2)
The same procedure as in Comparative Example 1 was used, except that a colored coating component having a surface L * value of 50 was used. Comparative Example 2 was different from Comparative Example 1 in the composition of the pigment (mixing ratio of titanium oxide, iron oxide, and carbon black). Therefore, although the comparative example 1 and the comparative example 2 differ in the L * value of the surface of a coloring coating structure, (DELTA) L * value and PWC are the same.

(Comparative Example 3)
As a colored coating composition, a material having an L * value of 45 on the surface was used, the ΔL * value was set to −1.1, and the pigment was changed to PWC 30%.

(Comparative Example 4)
The same as Comparative Example 3 except that the ΔL * value was 0.1. In Comparative Example 4, the composition of the pigment (mixing ratio of titanium oxide, iron oxide, and carbon black) was changed from that in Comparative Example 3. Therefore, Comparative Example 3 and Comparative Example 4 have the same PWC, but have different ΔL * values.

(Comparative Example 5)
The same procedure as in Comparative Example 4 was performed except that the ΔL * value was set to 0. In Comparative Example 5, the composition of the pigment (mixing ratio of titanium oxide, iron oxide, and carbon black) was changed from that in Comparative Example 4. Therefore, Comparative Example 4 and Comparative Example 5 have the same PWC but different ΔL * values.

A Colored paint composition 3 Clear coating

Claims (4)

This is a method for selecting a paint for repair used in a colored coating structure in which a clear coating film that is transparent with time changes on the outermost surface is formed of an inorganic resin paint. The colored coating structure is specified in JIS Z 8729. The L * a * b * color system L * value is 45 or less, and the difference from the L * value of the colored coating composition is −1 or more and less than 0 . Selection method . The method for selecting a repair paint according to claim 1, wherein the repair paint contains an acrylic resin and has a pigment weight content of 15 to 30%. The method for selecting a paint for repair according to claim 1, wherein the paint for repair contains a fluororesin and has a pigment weight content of 15 to 40%. The method for selecting a repair paint according to claim 1, wherein the repair paint contains an inorganic substance having a polysiloxane skeleton and has a pigment weight content of 15 to 40%.

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