JP2007154431A - Decorative building board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative building board excellent in the fixing characteristics and color developing characteristics of ink, and capable of acquiring high weatherability and resistance to temperature and moisture. <P>SOLUTION: In this decorative building board, a receiving layer, an inkjet layer, a clear layer, an inorganic coating layer and a photocatalytic coating layer are superposed on the front side of a substrate in this order. The clear layer is formed by applying water-base coating onto front side of the inkjet layer in such a manner that the amount of coating is in the range of 20-200 g/m<SP>2</SP>wet, and burning it at 100-200°C for thirty seconds or longer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a decorative building board provided with a desired pattern by ink jet printing.

  Conventionally, as a decorative building board on which a desired pattern is formed by ink jet printing, a decorative building board as shown in FIG. 3 is known (for example, see Patent Document 1). Is formed. First, the receiving layer 2 is formed by applying an acrylic paint on the surface of the substrate 1 such as a cement board, and then the inkjet layer 3 is formed on the surface of the receiving layer 2 by ink-jet printing with aqueous ink. Thereafter, by forming the clear layer 4 on the surface of the inkjet layer 3 with an acrylic paint or a clear paint, a decorative building board as shown in FIG. 3 can be obtained.

The receiving layer 2 can fix the ink of the ink jet layer 3 to obtain a clear pattern, and the clear layer 4 can protect the ink jet layer 3.
JP 2004-60241 A (FIG. 2)

  However, in manufacturing a decorative building board, it is desirable to suppress the scattering of organic solvents in consideration of the environment. Therefore, for example, it is conceivable to form the clear layer 4 with a water-based paint. In this case, since the ink-jet layer 3 below the clear layer 4 is also a water-based ink, the water-based ink dissolves into the clear layer 4 and spreads. Become. If it does so, the resolution of inkjet printing will fall.

  In addition, in the conventional decorative building board as shown in FIG. 3, there is generally a higher demand for weather resistance, and an inorganic paint layer that can provide weather resistance on the clear layer 4. Can be considered. However, when the clear layer 4 is formed of a water-based paint, the film-forming property is deteriorated depending on the coating amount and baking conditions, and the heat and humidity resistance of the decorative building board is thereby lowered. This can be confirmed by the appearance of a whitening phenomenon as a result of the accelerated test.

  The present invention has been made in view of the above points, and has an object to provide a decorative building board that is excellent in ink fixability and color developability, and that can obtain high weather resistance and high temperature and humidity resistance. To do.

In the decorative building board according to claim 1 of the present invention, the receiving layer 2, the inkjet layer 3, the clear layer 4, the inorganic paint layer 5, and the photocatalyst paint layer 6 are laminated on the surface of the substrate 1 in this order, and the clear The layer 4 is formed by applying a water-based paint at a coating amount of 20 to 200 g / m ² · wet on the surface of the ink jet layer 3 and baking it at 100 to 200 ° C. for 30 seconds or more. It is.

  The invention of claim 2 is characterized in that, in claim 1, the receiving layer 2 is formed of a water-based paint.

  According to the decorative building board of the first aspect of the present invention, the ink fixing property and the color developing property are excellent, and the weather resistance and the temperature and humidity resistance can be enhanced. Moreover, since the clear layer is formed of a water-based paint, the environmental load can be reduced.

  According to the invention of claim 2, the environmental load can be further reduced.

  Embodiments of the present invention will be described below.

  As shown in FIG. 1, the decorative building board according to the present invention has a receiving layer 2, an inkjet layer 3, a clear layer 4, an inorganic paint layer 5, and a photocatalyst paint layer 6 laminated in this order on the surface of the substrate 1. Is formed by.

  Although it does not specifically limit as the base material 1, For example, using inorganic boards, such as a flexible board, a calcium silicate board, a gypsum slag perlite board, a wood piece cement board, a precast concrete board, an ALC board, a gypsum board, is used. it can.

  In manufacturing a decorative building board, the receiving layer 2 is generally formed after applying a sealer (not shown) to the surface of the substrate 1 as described above, although it is not essential. A known sealer can be used. The receiving layer 2 is a layer necessary for fixing the ink of the inkjet layer 3 formed thereon, and can be formed with a paint diluted with an organic solvent, but is preferably formed with an aqueous paint. In this way, the environmental load can be reduced by forming the receiving layer 2 with a water-based paint.

As the water-based paint, an acrylic resin paint or an acrylic silicon resin paint can be used. It is preferable to mix at least one of extender pigments and hygroscopic resins in the water-based paint. As a result, the fixing property of the ink can be improved, and bleeding can be prevented when the clear layer 4 is formed later with a water-based paint, and the coloring property can also be improved. Here, silica, alumina, aluminum hydroxide, barium sulfate, porous silica, diatomaceous earth, or the like can be used as the extender pigment, and vinyl acetate, urethane polymer, acrylic polymer, polyvinyl alcohol can be used as the hygroscopic resin. Ink-absorbing polymers such as can be used. In addition, pigments such as titanium oxide, iron oxide, and carbon black can be blended in the water-based paint as a colorant. Moreover, when forming the receiving layer 2 with a water-based coating material, it is preferable to apply | coat a water-based coating material to the surface of the base material 1 by the coating amount of 30-200 g / m < ² > * wet. The aqueous paint can be applied using a spray gun, roll coater, flow coater, curtain coater, or the like.

  Next, the inkjet layer 3 is formed by inkjet printing of aqueous ink on the surface of the receiving layer 2. Here, as an ink jet apparatus for ink jet printing, for example, the one shown in FIG. 2 can be used. This ink jet apparatus includes a painting nozzle head 8 provided with an ejection nozzle 7, a paint supply tank 9 for supplying aqueous ink to the ejection nozzle 7 of the painting nozzle head 8, and ejection of aqueous ink from the ejection nozzle 7 of the painting nozzle head 8. The inkjet coating machine 11 provided with the coating control system 10 to be controlled, and the transport conveyor 12 that transports the substrate 1 are formed.

  The coating nozzle head 8 is formed of four types of coating nozzle heads 8y, 8c, 8m, and 8k that eject yellow, cyan, magenta, and black water-based inks, so that full-color printing can be performed. It is. Similarly, the paint supply tank 9 is also composed of four types. The paint supply tank 9y supplying yellow aqueous ink is applied to the coating nozzle head 8y, and the paint supply tank 9c supplying cyan aqueous ink is applied to the coating nozzle head. 8c, the paint supply tank 9m for supplying magenta water-based ink is connected to the coating nozzle head 8m, and the paint supply tank 9k for supplying black water-based ink is connected to the coating nozzle head 8k. The coating nozzle heads 8y, 8c, 8m, and 8k are arranged along the transport direction of the substrate 1.

  The painting control system 10 includes various CPUs, ROMs, RAMs, and the like, and includes a painting data creation unit, a painting control unit, an injection nozzle control unit, and the like. The painting data creation unit inputs and stores the color pattern data obtained by scanning the original image with a scanner or the like, and the painting control unit paints the color pattern data corresponding to the substrate 1 to be painted. A control signal is output from the data creation unit to the ejection nozzle control unit based on the color pattern data. The spray nozzle controller is connected to the spray nozzles 7 of the coating nozzle heads 8y, 8c, 8m, and 8k, and controls each spray nozzle 7 based on a control signal input from the spray nozzle controller. It is. Each injection nozzle 7 performs injection or stops injection by, for example, a piezo control method, and each of the yellow, cyan, magenta, and black is controlled by controlling each injection nozzle 7 with an injection nozzle control unit. It is possible to perform coating by full color printing corresponding to the color pattern by individually controlling the ejection and stop of the water-based ink.

  The conveyance conveyor 12 is arrange | positioned under the inkjet type coating machine 11, and can be formed with a belt conveyor.

  And when performing inkjet printing with the inkjet apparatus formed as mentioned above, the base material 1 in which the receiving layer 2 was formed is first introduce | transduced on the conveyance conveyor 12. FIG. The introduced base material 1 is sent as it is and passes under the coating nozzle heads 8y, 8c, 8m, and 8k of the ink jet type coating machine 11 in order. As described above, the inkjet layer 3 is formed on the surface of the receiving layer 2 by spraying the aqueous ink from the coating nozzle heads 8y, 8c, 8m, and 8k while applying the base material 1 on the conveyor 12. It is something that can be done. The base material 1 coated in this way is further sent and carried out to the next process.

  Thereafter, the clear layer 4 is formed on the surface of the inkjet layer 3. The clear layer 4 is a layer necessary for protecting the ink jet layer 3 formed thereunder, and is formed of a water-based paint. Thus, the environmental load can be further reduced by forming the clear layer 4 with a water-based paint.

As the water-based paint, it is preferable to use an acrylic resin paint based on an acrylic emulsion or an acrylic silicon resin paint based on an acrylic silicon emulsion. Thereby, the inorganic coating layer 5 to be formed later can be strongly adhered to the clear layer 4. It is preferable to mix cosmetic aggregates such as acrylic beads and mica into the water-based paint. Thereby, the designability can be improved. In forming the clear layer 4 with an aqueous paint, the aqueous paint is applied to the surface of the inkjet layer 3 at an application amount of 20 to 200 g / m ² · wet. At this time, when the coating amount is less than 20 g / m ² · wet, the weather resistance of the decorative building board is deteriorated. Conversely, when the coating amount is more than 200 g / m ² · wet, the aqueous layer of the inkjet layer 3 is reduced. The ink melts and spreads in the clear layer 4, and a large amount of energy for baking is required. And it is preferable to perform baking drying on 100-200 degreeC and the conditions for 30 second-5 minutes. If baking and drying are not sufficiently performed, such as less than 100 ° C. or less than 30 seconds, the durability (temperature and humidity resistance) of the decorative building board is lowered after the inorganic coating layer 5 described later is formed. On the other hand, if the temperature exceeds 200 ° C. or exceeds 5 minutes, a problem arises in film formability such as foaming of the coating film. The aqueous paint can be applied using a spray gun, roll coater, flow coater, curtain coater, or the like. Moreover, baking drying can be performed using a jet dryer, for example.

  Thereafter, in the present invention, unlike the conventional one shown in FIG. 3, an inorganic paint layer 5 is formed on the surface of the clear layer 4 as shown in FIG. The inorganic paint layer 5 is a layer necessary for improving the weather resistance of the decorative building board. For example, the coating composition described in Japanese Patent No. 3242442 and Japanese Patent No. 3193932, It can be formed with an inorganic coating agent described in Japanese Patent No. 249822.

Specific examples of the inorganic coating material include the coating composition described in Japanese Patent No. 3242442. That is,
(A) General formula (I)
R ¹ _n SiX _4-n (I)
Wherein R ¹ is the same or different, alkyl group, cycloalkyl group, alkenyl group, halogen-substituted hydrocarbon group, γ-methacryloxypropyl group, γ-glycidoxypropyl group, 3,4-epoxycyclohexylethyl. A monovalent hydrocarbon group having 1 to 8 carbon atoms selected from the group consisting of a group and a γ-mercaptopropyl group, n is an integer of 0 to 3, X is an alkoxy group, an acetoxy group, an oxime group, an enoxy group, A hydrolyzable group selected from the group consisting of an amino group, an aminoxy group, and an amide group.) In a colloidal silica dispersed in an organic solvent or water, A silica-dispersed oligomer solution of organosilane obtained by partial hydrolysis under the condition of using 0.001 to 0.5 mol,
(B) Average composition formula (II)
R ² _a Si (OH) _b O _{(4-ab) / 2} (II)
Wherein R ² is the same or different, alkyl group, cycloalkyl group, alkenyl group, halogen-substituted hydrocarbon group, γ-methacryloxypropyl group, γ-glycidoxypropyl group, 3,4-epoxycyclohexylethyl. A monovalent hydrocarbon group having 1 to 8 carbon atoms selected from the group consisting of a group and a γ-mercaptopropyl group, wherein a and b are 0.2 ≦ a ≦ 2, 0.0001 ≦ b ≦ 3, a + b, respectively. <A number satisfying the relationship of 4), and a polyorganosiloxane containing 1 to 30 mol% of phenyl groups based on the total R ² groups in R ² in the component, and
(C) The catalyst which accelerates | stimulates the condensation reaction of (A) component and (B) component is made into an essential component, Silica is contained as 5 to 95weight% in solid content in (A) component, At least of hydrolyzable organosilane 50 mol% is an organosilane having n = 1, and the coating composition comprises 99 to 1 part by weight of (B) component to 1 to 99 parts by weight of (A) component.

And in forming the inorganic coating layer 5, the base material 1 on which the clear layer 4 is formed is heated in advance to 40 ° C. or more, and in this state, the inorganic coating is applied by using a spray gun. Can do. At this time, it is preferable that drying conditions are 100-200 degreeC and 1 to 5 minutes. If the baking and drying are not performed sufficiently, depending on the environmental conditions, the durability (weather resistance and temperature and humidity resistance) of the decorative building board may be reduced, and the performance of the photocatalyst coating layer 6 to be described later can be sufficiently obtained. It may not be possible. Moreover, when forming the inorganic coating layer 5, it is preferable to apply the inorganic coating to the surface of the clear layer 4 at a coating amount of 4 to 40 g / m ² · dry. If the coating amount is less than 4 g / m ² · dry, weather resistance and durability may not be sufficiently obtained. Conversely, if the coating amount is more than 40 g / m ² · dry, curing shrinkage increases. There is a fear.

  Further, in the present invention, a photocatalyst coating layer 6 is formed on the surface of the inorganic coating layer 5 as shown in FIG. The photocatalyst coating layer 6 has a property of exhibiting super hydrophilicity when irradiated with ultraviolet rays (sunlight), and is a layer necessary for improving the antifouling property of the decorative building board. For example, Japanese Patent No. 2767259. The antibacterial inorganic paint described in Japanese Patent Publication No. Gazette and “Fressera PS1000” manufactured by Matsushita Electric Works Co., Ltd. can be used.

In forming the photocatalyst paint layer 6, the base material 1 on which the inorganic paint layer 5 is formed is preheated to 40 ° C. or more, and in this state, the photocatalyst paint layer forming paint is applied using a spray gun. Can be done by. Thus, by heating the base material 1 in advance, the energy in the drying process after forming the photocatalyst coating layer 6 can be kept small. In forming the photocatalyst paint layer 6, it is preferable to apply a photocatalyst paint layer-forming paint on the surface of the inorganic paint layer 5 at a coating amount of 0.5 to 5 g / m ² · dry. If the coating amount is less than 0.5 g / m ² · dry, the antifouling property may not be sufficiently obtained. Conversely, if the coating amount is more than 5 g / m ² · dry, the decorative building board is milky white. Thus, there is a risk that the designability is lowered.

In the decorative building board formed as described above, since the inorganic coating layer 5 is formed on the surface of the clear layer 4, it is possible to obtain higher weather resistance than the conventional one shown in FIG. It is something that can be done. Moreover, since the said clear layer 4 is formed by apply | coating an aqueous coating material with the application amount of 20-200 g / m < ² > / wet, and baking this at 100-200 degreeC for 30 second or more, without impairing a weather resistance, High temperature and humidity resistance can be obtained. Moreover, even if the clear layer 4 formed of a water-based paint is formed on the inkjet layer 3 formed of a water-based ink, the water-based ink does not dissolve in the clear layer 4 and does not bleed. A decrease in the resolution of ink jet printing can be prevented. That is, the decorative building board shown in FIG. 1 is superior in ink fixing property and color developing property to the conventional construction board shown in FIG. Furthermore, in the decorative building board shown in FIG. 1, dirt such as organic matter adhering to the surface of the decorative building board is decomposed by the photocatalytic action of the photocatalyst paint layer 6, and the photocatalyst paint layer 6 is superhydrophilic. As a result, the decomposed dirt can be easily removed by running water, so that the antifouling property of the decorative building board can be enhanced. Of course, like the conventional decorative building board, the ink of the inkjet layer 3 can be fixed by the receiving layer 2 to obtain a clear pattern. Therefore, in the present invention, such a clear pattern by full-color printing is used. It can be maintained for a long time.

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

  As shown in FIG. 1, the decorative building boards of Examples 1 to 3 and Comparative Examples 1 and 2 have a receiving layer 2, an inkjet layer 3, a clear layer 4, an inorganic coating layer 5, and a photocatalyst coating on the surface of the substrate 1. Layer 6 was produced by laminating in this order.

  Here, a cement substrate was used as the substrate 1.

  The receiving layer 2 was formed using an acrylic resin paint (AcEm type) based on an acrylic emulsion. The acrylic resin paint was mixed with 10% by mass of porous silica as an extender and 20% by mass of vinyl acetate as a hygroscopic resin.

  Moreover, the inkjet layer 3 was formed by carrying out inkjet printing of the aqueous ink on the surface of the receiving layer 2 using the inkjet apparatus as shown in FIG.

  Here, as the water-based ink, an ink containing 50% by weight of an aqueous pigment dispersion, 10% by weight of diethylene glycol, 20% by weight of glycerin, 10% by weight of diethylene glycol monobutyl ether, and 10% by weight of water was used. As the aqueous pigment dispersion, a pigment, a water-soluble resin (acrylic acid copolymer) and water mixed so that pigment / water-soluble resin / water = 10/4/86 were used. As the pigment, cyan (phthalocyanine blue), magenta (petal), yellow (yellow iron oxide), and black (carbon black) were used, and water-based ink was prepared for each color pigment.

  The clear layer 4 was formed using an acrylic resin paint (AcEm system) based on an acrylic emulsion. In particular, in Example 2, an acrylic resin paint containing 5% by mass of mica was used as the decorative aggregate, and in Example 3, an acrylic resin paint containing 3% by mass of acrylic beads was used as the decorative aggregate. The coating amount and drying time of the water-based paint for forming the clear layer 4 are as shown in [Table 1] below.

  The inorganic coating layer 5 was formed using the coating composition of Example 1 described in Japanese Patent No. 3242442. The coating amount and drying conditions of this inorganic coating are as shown in [Table 1] below.

  The photocatalyst coating layer 6 was formed using “Fressela PS1000” manufactured by Matsushita Electric Works Co., Ltd. The coating amount of the photocatalyst coating layer forming coating is as shown in [Table 1] below.

  The decorative building board formed as described above was tested for weather resistance and heat and humidity resistance.

  The weather resistance test was conducted as follows. That is, after irradiating the surface of each decorative building board with ultraviolet rays for 5000 hours with a sunshine weatherometer (SWOM), the surface of each decorative building board was visually observed to evaluate the weather resistance. The weather resistance of each decorative building board was determined based on the following criteria. The results are shown in [Table 1] below.

“◯”: The change is hardly observed “Δ”: The change is slightly observed On the other hand, the temperature and humidity resistance test was performed as follows. That is, each decorative building board was immersed in warm water of 60 ° C. for 8 hours and air-dried for 16 hours, and then the surface of each decorative building board was visually observed for the presence or absence of whitening to evaluate the temperature and humidity resistance. The heat and humidity resistance of each decorative building board was determined based on the following criteria. The results are shown in [Table 1] below.

“○”: No change “×”: Change

  As seen in the above [Table 1], it is confirmed that the decorative building boards of Examples 1 to 3 can obtain high weather resistance and high temperature and humidity resistance.

  On the other hand, it is confirmed that the decorative building board of Comparative Example 1 in which the coating amount of the water-based paint for forming the clear layer 4 is too much is impaired in the temperature and humidity resistance. Moreover, it is confirmed that the decorative building board of Comparative Example 2 in which the coating amount of the water-based paint for forming the clear layer 4 is too small cannot obtain sufficiently high weather resistance.

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. It is sectional drawing which shows an example of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Receiving layer 3 Inkjet layer 4 Clear layer 5 Inorganic coating layer 6 Photocatalyst coating layer

Claims (2)

A receiving layer, an ink jet layer, a clear layer, an inorganic paint layer, and a photocatalyst paint layer are laminated in this order on the surface of the substrate, and the clear layer is coated with an aqueous paint on the surface of the ink jet layer in an amount of 20 to 200 g / m ^2. A decorative building board formed by applying with wet and baking it at 100 to 200 ° C. for 30 seconds or more.   The decorative building board according to claim 1, wherein the receiving layer is formed of a water-based paint.

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