JP2009285553A - Paint plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paint plate to which a pattern having a natural feeling like when color beads, color sands or the like are used is applied only according to inkjet coating without using the color beads and color sands or the like, with respect to the paint plate to which the inkjet coating is applied. <P>SOLUTION: An inkjet layer 3 and a clear layer 4 formed so as to be laminated on the inkjet layer 3 are disposed on a substrate 1. The inkjet layer 3 is formed with an aqueous ink according to an inkjet coating and the clear layer 4 is formed with a hydrophobic clear coating material before the aqueous ink which is applied according to the inkjet coating is dried. Therefore, upon the coating of the clear coating material, the aqueous ink constituting the inkjet layer 3 is aggregated due to an interfacial tension and voids due to ink omission are formed in a dotted state. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coated plate on which a desired pattern is formed by inkjet coating.

  Conventionally, as shown in FIG. 1, a coated plate (for example, see Patent Document 1) on which a desired pattern is formed by inkjet coating is manufactured as follows, for example.

  First, the receiving layer 2 is formed by applying acrylic paint or the like to the surface of the substrate 1 such as a cement board. Next, the ink-jet layer 3 is formed by applying water-based ink to the surface of the receiving layer 2 by ink-jet coating. Thereafter, a clear layer 4 is formed on the surface of the inkjet layer 3 with an acrylic paint or the like. Further, in the example shown in FIG. 1, the inorganic coating layer 5 is formed by being laminated on the clear layer 4. Thereby, a coating plate as shown in FIG. 1 is produced. The receiving layer 2 has a function of fixing the ink of the ink jet layer 3 to express a clear pattern, and the clear layer 4 has a function of protecting the ink jet layer 3.

  Ink-jet coating is capable of local and position-controlled coating as compared to coating using a coating roll or the like that has been generally used so far. There is an advantage that a highly-coated plate can be manufactured. The use of such a coated plate as an exterior material such as an outer wall material, a roof material, and a roofing material is expected to increase the design of the building.

  In recent years, due to the demand for higher design of buildings, further improvement in design has been demanded for coated plates on which inkjet coating has been applied. Therefore, for example, it is considered that a pattern having a natural texture is formed by further spreading and fixing color beads or color sand on a coated plate on which inkjet coating has been applied.

However, when colored beads, color sand, or the like is sprayed on the coated plate, there is a problem that the manufacturing process becomes complicated and the manufacturing raw material increases. In addition, when the color beads fixed on the paint plate are peeled off, there is a problem that the paint film on the paint plate at that portion is peeled off. In addition, when a painted plate is applied to a building or the like, there is a risk that an operator handling the painted plate may be injured by colored beads. In addition, since it is difficult to control the spraying position of the color beads or the like, there is also a problem that it is difficult to spray the color beads or the like only at a desired location on the painted plate.
JP 2007-154430 A

  The present invention has been made to solve the above-mentioned problems, and is a coated plate that has been subjected to inkjet coating. The colored beads are used only by inkjet coating, regardless of color beads or color sand. An object of the present invention is to provide a coated plate provided with a pattern having a natural texture similar to that in the case of the above.

  The coated plate according to the present invention is provided with an inkjet layer 3 on a substrate 1 and a clear layer 4 formed by being laminated on the inkjet layer 3. The inkjet layer 3 is formed of water-based ink by ink-jet coating, and the clear layer 4 is formed of hydrophobic clear paint before the water-based ink applied by ink-jet coating is dried.

  For this reason, when the clear paint is applied, the water-based ink constituting the ink jet layer 3 aggregates due to the interfacial tension, and the ink drops are scattered. For this reason, in the pattern formed by inkjet coating, the background color appears in the appearance at the portion where ink is missing. In particular, in the region where the application density of the water-based ink is high, the change in appearance due to the lack of ink appears significantly.

  According to the present invention, a pattern formed by ink jet coating is formed by interspersed with portions where the color of the base appears in the appearance due to ink loss, thereby enabling ink jet without using glass beads or the like. A pattern having a natural texture is formed only by painting. In particular, a pattern having a natural texture appears remarkably in a region where the water-based ink application density is high, and when ink-jet coating, the water-based ink application density in a desired region in the ink-jet layer is increased to give a natural texture to that region. The pattern which it has can be made to appear notably.

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

  As shown in FIG. 1, the coated plate according to the present embodiment is formed by laminating a receiving layer 2, an inkjet layer 3, a clear layer 4, and an inorganic coating layer 5 in this order on the surface of the substrate 1. .

  Although the material of the board | substrate 1 is not restrict | limited in particular, For example, inorganic boards, such as a flexible board, a calcium silicate board, a gypsum slag perlite board, a piece of wood cement board, a precast concrete board, an ALC board, a gypsum board, are used.

  At the time of manufacturing the coated plate, for example, an appropriate sealer is applied to the surface of the substrate 1 as necessary, and then the receiving layer 2 is formed. A known sealer is used. The receiving layer 2 has a function of fixing the ink constituting the ink jet layer 3 and is formed of, for example, a paint diluted with an organic solvent, but is preferably formed of an aqueous paint.

  Examples of the aqueous paint used for forming the receiving layer 2 include an acrylic resin paint based on an acrylic emulsion and an acrylic silicon resin paint based on an acrylic silicon emulsion. The aqueous paint preferably contains at least one of an extender pigment and a hygroscopic resin. In this case, the fixing property of the ink to the receiving layer 2 is improved, and the coloring property is also improved. Examples of the extender pigment include silica, alumina, aluminum hydroxide, barium sulfate, porous silica, and diatomaceous earth. As the hygroscopic resin, an ink-absorbing polymer such as vinyl acetate, urethane polymer, acrylic polymer, polyvinyl alcohol, or the like is used. In addition, the water-based paint may contain a pigment such as titanium oxide, iron oxide, or carbon black as a colorant.

The water-based paint as described above is applied to the substrate 1 by an appropriate method such as spray coating, curtain coating, dipping, wire bar coating, applicator coating, spin coating, roll coating, electrodeposition coating, brush coating, and the like. By receiving the film, the receiving layer 2 is formed. The amount of water-based paint applied to the substrate 1 when the receiving layer 2 is formed is preferably in the range of 30 to 200 g / m ² · wet.

  Next, the inkjet layer 3 is formed by applying water-based ink to the surface of the receiving layer 2 by inkjet coating.

  An inkjet apparatus used for inkjet coating has a configuration as shown in FIG. 2, for example. The inkjet apparatus includes a coating nozzle head 8 having an ejection nozzle 7, a paint supply tank 9 in which water-based ink supplied to the ejection nozzle 7 is stored, and a coating control system 10 that controls ejection of water-based ink from the ejection nozzle 7. And the like, and a transport conveyor 12 for transporting the substrate 1.

  The painting control system 10 includes various CPUs, ROMs, RAMs, and the like. The painting control system 10 includes a painting data creation unit, a painting control unit, an injection nozzle control unit, and the like. The painting data creation unit stores and saves the data of the color pattern created by scanning the original image. The color pattern is created so that a predetermined pattern is formed at a predetermined position on the substrate 1 by inkjet coating. The painting control unit has a function of fetching the color pattern data from the painting data creating unit and outputting a control signal to the spray nozzle control unit based on the color pattern data. The spray nozzle control unit has a function of controlling the spray nozzle 8 of the coating nozzle head based on a control signal input from the coating control unit.

  The coating nozzle head 8 is provided at the lower end of the ink jet type coating machine 11 and is formed as a long line head in a direction perpendicular to the feeding direction of the substrate 1. As the coating nozzle head 8, four types of coating nozzle heads 8 y, 8 c, 8 m, and 8 k that eject paints of yellow, cyan, magenta, and black are arranged so as to be arranged along the conveyance direction of the substrate 1. ing. The number of coating nozzle heads 8 is appropriately changed according to the type of water-based ink used. The paint supply tank 9 (9y, 9c, 9m, 9k) is provided for each coating nozzle head 8 (8y, 8c, 8m, 8k).

  The ejection of each ejection nozzle 8 is controlled by, for example, a piezo control system or a control system for irradiating the photothermal exchange element with laser light. Under the control of the spray nozzle control unit, spraying and stopping of the paint from each spray nozzle 8 are individually controlled, and full color coating corresponding to the color pattern is performed.

  The conveying means 12 is formed by a belt conveyor in which an infinite belt such as a timing belt is suspended between pulleys. The upper surface of the belt is disposed below the ink jet type coater 11.

  At the time of inkjet coating, first, the substrate 1 is supplied to the conveying means 12. At this time, for example, the plurality of substrates 1 are sequentially transported at intervals by the transport means 12.

  Thus, the board | substrate 1 conveyed by the conveyance means 12 passes the downward direction of the coating nozzle head 8. FIG. At this time, the ink is ejected from the coating nozzle head 8 toward the ink receiving layer 2 on the substrate 1 by the ink jet method, and the substrate 1 is provided with the design pattern. The substrate 1 after painting is further carried out to the next process.

  Next, a clear layer 4 is further formed on the surface of the substrate 1 on which the inkjet layer 3 is formed. The clear layer 4 is provided to protect the inkjet layer 3.

  The clear layer 4 is formed of a hydrophobic clear paint. Examples of the hydrophobic clear paint include acrylic paints and acrylic silicon paints containing a hydrophobic organic solvent such as butyl acetate and xylene as a solvent.

  Such a hydrophobic clear paint is applied to the surface of the substrate 1 after inkjet coating by spraying or the like, and is then formed by baking and drying to form the clear layer 4. The thickness of the clear layer 4 is not particularly limited, but is preferably in the range of 1 to 10 μm.

  The application of the hydrophobic clear paint at the time of forming the clear layer 4 is performed before the water-based ink constituting the inkjet layer 3 is dried. For that purpose, it is preferable that the clear coating is applied within 60 seconds after the ink jet coating.

  When the clear paint is applied in this way, the water-based ink constituting the ink-jet layer 3 aggregates due to the interfacial tension, and the ink-jet layer 3 is formed with areas where no water-based ink exists (referred to as “ink missing”). Become so. When ink missing is formed in this way, ink missing is scattered in the pattern formed by ink jet painting, and the color of the base (receiving layer 2 in the present embodiment) appears in the appearance in this ink missing portion. become. For example, if the base color is white, the pattern appearing by the inkjet layer 3 is randomly scattered with fine white areas. For this reason, the pattern which has a natural texture is formed only by inkjet coating, without using a color bead, a color sand, etc. When the receiving layer 2 is colored, regions having various colors according to the color of the receiving layer 2 are formed in the pattern formed by the inkjet layer 3.

  Ink omission is formed over the entire ink jet layer 3, and in particular, in the portion where the aqueous ink application density is high in the ink jet layer 3, the concealability by the aqueous ink of the receiving layer 2 that is the base is excluded except for the ink omission portion. Therefore, the background color when ink is missing becomes particularly noticeable. For this reason, by increasing the application density of the water-based ink in a specific region in the inkjet layer 3, it is possible to form a pattern having a natural texture due to ink loss in that region.

The application density of the water-based ink for conspicuous ink omission is appropriately set according to the composition of the receiving layer 2, the composition of the water-based ink, the size and density of the droplets of the water-based ink during ink-jet coating, and the like. If the application amount of the water-based ink in a specific region in No. 3 is 200 nl / cm ² or more, ink loss in that region can be caused. More preferably, when the coating amount is 250 nl / cm ² or more, ink loss in that region can be particularly noticeable. The upper limit of the coating amount is not particularly limited, but is preferably 700 nl / cm ² or less. When the coating amount exceeds 700 nl / cm ² , bleeding becomes conspicuous between water-based inks of different colors in the inkjet layer 3, making it difficult to express the delicate design inherent in the inkjet layer 3.

Since the application amount of the water-based ink is determined depending on the data of the color pattern, the color pattern pattern is set so that the application amount of the water-based ink is 250 nl / cm ² or more in a specific region where ink loss is to be noticeable. By creating the pattern, it is possible to form a pattern having a natural texture due to ink loss in a desired region in the inkjet layer 3.

  In addition, the coating plate may be provided with an inorganic coating layer 5 formed by being laminated on the clear layer 4. The inorganic coating layer 5 is formed by applying and coating an inorganic coating on the surface of the clear layer 4. This inorganic coating layer 5 improves the weather resistance of the coated plate. As the inorganic paint, an appropriate silicon alkoxide coating agent or the like is used. Specific examples of inorganic coating materials include silicon alkoxide coating materials prepared by adding a condensation reaction catalyst such as polyorganosiloxane or alkyl titanate to silica dispersion oligomer solution of organosilane, or further adding silica. Is mentioned. After such an inorganic paint is applied by, for example, electrostatic coating, the inorganic paint layer 5 is formed by baking and drying at 60 to 120 ° C. to form a film. The thickness of the inorganic coating layer 5 is not particularly limited, but is preferably in the range of 1 to 10 μm.

  Moreover, the photocatalyst layer 6 formed by laminating | stacking on the said inorganic coating material layer 5 may be provided in the coating board. The photocatalyst layer 6 is formed by applying and forming an inorganic paint containing a photocatalyst on the surface of the inorganic paint layer 5. This photocatalyst layer 6 improves the antifouling property of the coated plate. As the inorganic paint containing a photocatalyst, an appropriate one can be used. For example, a coating obtained by adding a photocatalyst such as titanium oxide to the above-described silicon alkoxide paint can be used. An inorganic paint containing such a photocatalyst is applied by, for example, spray coating, and then baked and dried at 60 to 120 ° C. to form a photocatalyst layer 6. The thickness of the photocatalyst layer 6 is not particularly limited, but is preferably in the range of 0.2 to 1.0 μm.

(Examples 1-3, Comparative Examples 1-2)
As the substrate 1, a cement-based inorganic substrate 1 was used.

In the production of the substrate 1, a sealer made of an acrylic emulsion paint is applied to the surface of a wet sheet before curing and curing a cement-based molding material by a roll coater and heated at 250 ° C. for 20 minutes to dry the coating amount. The substrate 1 was obtained by forming a 40 g / m ² sealer coating and curing the wet sheet.

  The surface of the substrate 1 provided with the sealer coating was spray coated with a receiving layer forming composition (pigment content ratio PWC = 50 mass%) containing calcium carbonate fine particles as a pigment in an acrylic emulsion paint at 130 ° C. The ink receiving layer 2 having a thickness of 30 μm was formed by heating for 2 minutes.

  The substrate 1 on which the ink receiving layer 2 was formed was subjected to ink jet coating on the surface of the ink receiving layer 2 using the coating apparatus having the configuration shown in FIG.

At the time of this ink-jet coating, regions where the amount of water-based ink applied was 170 nl / cm ² , 230 nl / cm ² , and 250 nl / cm ² were formed on the ink-jet layer 3.

  At the time of this ink-jet coating, a water-based ink having a composition of 4% by mass of pigment, 35% by mass of ethylene glycol, 20% by mass of glycerin, 3% by mass of additive, and 38% by mass of water is used. Ocher and cyan inks containing phthalocyanine, magenta ink containing Bengala, and black ink containing carbon black were used. Further, the amount of ink ejected from each ejection nozzle 8 for one dot was set to 27 pl.

  Next, when the time shown in the “Elapsed time” column of Table 1 has elapsed after inkjet coating, a clear paint having the composition shown in Table 1 below is spray-applied to the surface of the inkjet layer 3, and 1 The clear layer 4 having a dry film thickness of 20 μm was formed by heating for a minute.

  Next, the surface of the clear layer 4 was spray-coated with an inorganic paint containing polyorganosiloxane, and heated at 130 ° C. for 2 minutes to form an inorganic paint layer 5 having a dry film thickness of 5 μm.

Next, the surface of the inorganic coating layer 5 is spray-coated with an inorganic coating that contains polyorganosiloxane and titanium oxide at a ratio of 50% by mass, and is heated at 130 ° C. for 2 minutes to have a dry coating amount of 3 g. A photocatalyst layer 6 of / m ² was formed.

(Evaluation test)
For each of the examples and comparative examples, each region where the amount of water-based ink applied was 170 nl / cm ² , 230 nl / cm ² , 250 nl / cm ² was observed, and the results were evaluated as follows. The results are shown in Table 1.

◎ ... 10 or more ink missing per 30 cm × 30 cm region ○… 5-9 ink missing per 30 cm × 30 cm region × ... less than 5 ink missing per 30 cm × 30 cm region is there

As a result, when the clear layer 4 was formed with a hydrophobic clear paint within 60 seconds after inkjet coating, that is, before the water-based ink was dried as in Examples 1 to 3, the ink application amount was 230 nl / cm ^2. It was confirmed that a pattern having a natural texture was formed in the region of 250 nl / cm ² . In particular, it was confirmed that a pattern having a more remarkably natural texture was formed in a region where the ink application amount was 250 nl / cm ² .

  On the other hand, in Comparative Example 1 in which a hydrophilic clear paint using water as a solvent is used, not only ink omission is observed, but also the pattern is blurred, and 60 seconds after inkjet coating. In Comparative Example 2 in which clear coating was applied after the water-based ink was dried, no ink drop was formed.

It is sectional drawing which shows an example of embodiment of this invention. It is a schematic front view which shows an example of an inkjet apparatus.

Explanation of symbols

1 Substrate 3 Inkjet layer 4 Clear layer

Claims (1)

The substrate is provided with an inkjet layer and a clear layer formed by laminating the inkjet layer,
The coated plate, wherein the inkjet layer is formed with water-based ink by inkjet coating, and the clear layer is formed with a hydrophobic clear paint before the water-based ink applied by inkjet coating is dried.