JP2009107298A - Manufacturing method of decorative building panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a decorative building panel capable of improving color development of an ink jet printing layer by a simple process. <P>SOLUTION: An enamel coating film 2 of an aqueous enamel paint on a surface of a first substrate material 1, a surface of this aqueous enamel paint coating layer 2 is subjected to frame treatment and then an ink jet printing layer is formed by an aqueous ink. By the frame treatment, a surface of the aqueous enamel paint coating layer 2 is oxidized whereby it becomes a C-OH bonding so as to make it hydrophilic tentatively, and compatibility between the aqueous ink and a surface of the aqueous enamel paint coating layer 2 becomes high by conducting ink jet printing with an aqueous ink on a surface of the enamel paint coating layer 2 after the frame treatment whereby generation of peeling off can be suppressed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a decorative building board used for exterior materials such as wall materials and roof materials.

As a decorative building board used for an exterior material or the like, a board applied with an ink jet printer has been proposed (for example, see Patent Document 1). In this decorative building board, a receiving layer is formed on the surface of a base material, and an ink jet printing layer is formed on the surface of the receiving layer by coating with an ink jet printer. Here, the receiving layer is provided on the surface of the base material in order to obtain a clear color without repelling the water-based ink forming the ink jet printing layer. Therefore, the receiving layer usually contains a water-absorbing resin, silica, alumina, or the like in the base coating material to prevent the water-based ink from repelling and to improve the water-based ink suction. However, the above receiving layer is very expensive and has a problem of poor water resistance.
JP 2007-154432 A

  This invention is made | formed in view of said point, and it aims at providing the manufacturing method of the decorative building board which can make the color development of an inkjet printing layer favorable by a simple method.

  In the method for producing a decorative building board according to claim 1 of the present invention, after forming the coating film 2 of the water-based enamel paint on the surface of the base material 1 and applying the frame treatment to the surface of the water-based enamel paint film 2, The ink-jet printing layer 3 is formed with a water-based ink.

  The method for producing a decorative building board according to claim 2 of the present invention is characterized in that, in claim 1, the contact angle of water on the surface of the water-based enamel paint film 2 after the frame treatment is 50 to 65 °. Is.

  The method for manufacturing a decorative building board according to claim 3 of the present invention is that, in claim 1 or 2, the relative moving speed of the base material 1 and the burner 5 during frame processing is 3 to 20 m / min. It is a feature.

  In the invention of claim 1, the surface of the water-based enamel coating film 2 is oxidized by the frame treatment, and a polar group is introduced by becoming a C—OH bond or the like, so that it can be temporarily made hydrophilic. The surface of the water-based enamel coating film 2 after the frame treatment is coated by water-based ink-jet printing, thereby improving the familiarity between the water-based ink and the surface of the water-based enamel coating film 2 and preventing the occurrence of flipping. Therefore, the color reproducibility such as color reproducibility can be improved by a simple method. In the present invention, the water-based enamel coating film 2 is not blended with a water-absorbing resin or the like to increase water absorption, so that it can be manufactured at low cost and water resistance is not impaired. It is something that can be done.

  According to the second aspect of the present invention, the familiarity of the water-based ink can be improved so that the occurrence of flipping can be hardly caused, and the color developability can be improved.

  In the invention of claim 3, the frame treatment of the water-based enamel coating film 2 can be carried out without causing defects such as foaming, and the color developability can be improved.

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

  As shown in FIG. 2, the decorative building board of the present invention is formed by providing a base material 1 with a water-based enamel coating film 2, an inkjet printing layer 3, and a clear coating film 4 in this order. The ink jet printing layer 3 is used for decorating and decorating a decorative building board, and the clear coating film 4 is overcoated on the ink jet printing layer 3 in order to protect the ink jet printing layer 3 from moisture and the like.

  The base material 1 may be either an inorganic material such as a ceramic base material or a metal base material, or an organic material such as a resin base material. The exterior material of the ceramic base material is used for applications such as tiles and outer wall materials. The ceramic base material is prepared by blending an inorganic filler, a fibrous material, etc. into a hydraulic glue used as a raw material for an inorganic hardened body, and curing and curing it. As a hydraulic glue, Although not particularly limited, for example, one or more selected from Portland cement, blast furnace cement, blast furnace slag, calcium silicate, gypsum and the like can be used. In addition, as the inorganic filler, fly ash, microsilica, silica sand, etc., and as the fibrous material, inorganic fibers such as pulp and synthetic fibers, and metal fibers such as steel fibers are used alone or in combination. Can be used. Molding can be performed by methods such as extrusion molding, cast molding, papermaking molding, press molding, etc., and after molding, autoclave curing, steam curing, room temperature curing as necessary, and ceramics used as exterior materials A system substrate can be produced. In addition, as the substrate 1, for example, an inorganic board (siding) 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, or a gypsum board can be used.

Moreover, the sealer coating film 1a can be provided on one side or both sides of the substrate 1 described above. The sealer coating 1a is formed for sealing the base material 1 and ensuring adhesion. As the sealer coating used for the formation of the sealer coating 1a, a permeable type undercoat made of a low molecular weight resin or an emulsion having a small particle diameter can be used. Specifically, for example, an acrylic emulsion resin was prepared by adding a pigment such as titanium oxide, an iron oxide pigment, carbon black, calcium carbonate, an additive such as butyl cellosolve or an antifoaming agent, water, and the like to stir and disperse. Things can be used as sealer paints. And when forming the sealer coating film 1a, it can form by apply | coating and drying the sealer coating on the surface of the base material 1. At this time, the sealer coating is preferably applied to the surface of the substrate 1 at an application amount of 32 to 76 g / m ² . And it is preferable to perform baking drying on 80-140 degreeC and the conditions for 1-3 minutes, for example using a jet dryer. The sealer coating can be applied using a spray gun, roll coater, flow coater, curtain coater, or the like.

  As the water-based enamel paint used for forming the water-based enamel paint film 2 described above, a color paint that has high concealing power for the base, has excellent durability, has a wide variety of colors, and can contribute to improving the appearance design. Can be used. Specifically, for example, pigments such as titanium oxide, iron oxide pigments, carbon black and barium sulfate, additives such as butyl cellosolve, antifoaming agents, thickeners, water, etc. A mixture prepared by adding and the like and stirring and dispersing can be used as the enamel paint.

  As the water-based ink used to form the inkjet printing layer 3 described above, a colorant such as an aqueous pigment is blended in water, and a penetrant, a drying inhibitor, a pH adjuster, a preservative, and the like as necessary. Can be prepared.

  As the clear paint used to form the clear coating film 4, an acrylic emulsion paint or the like can be used. As the acrylic emulsion paint, it is preferable to use an aqueous paint such as an acrylic resin paint based on an acrylic emulsion or an acrylic silicone resin paint based on an acrylic silicone emulsion in order to reduce environmental impact. System paints may also be used. The acrylic emulsion paint preferably contains aggregates such as acrylic beads and mica. Thereby, the designability can be improved.

And in manufacturing a decorative building board as shown in FIG. 2, a water-based enamel paint is applied to the surface of the sealer coating 1a provided on the surface of the base material 1 and dried for coloring and the like. A coating film 2 is formed. At this time, it is preferable that the water-based enamel coating is applied to the surface of the sealer coating 1a of the substrate 1 at a coating amount of 76 to 140 g / m ² . And it is preferable to perform baking drying on 80-120 degreeC and the conditions for 1-3 minutes, for example using a jet dryer. The enamel coating can be applied using a spray gun, roll coater, flow coater, curtain coater or the like.

  Next, a flame treatment is performed on the surface of the water-based enamel coating film 2. The flame treatment is performed by bringing the surface of the aqueous enamel coating film 2 into contact with a flame 6 ejected from a burner 5 such as a gas burner. Thereby, the surface of the normally water-repellent water-based enamel coating film 2 can be temporarily made hydrophilic. Further, in the flame treatment, it is preferable to bring the outer flame (oxidation flame) of the flame 6 into contact with the flame treatment, whereby the surface 6 of the water-based enamel coating film 2 is strongly oxidized by the flame 6 and the flame treatment is performed efficiently. be able to.

  Further, the flame treatment may be performed by contacting the flame 6 and the surface of the water-based enamel coating film 2 for several seconds (0.05 to 0.5 seconds), and the water-based enamel coating film 2 was formed as shown in FIG. This can be performed while the substrate 1 is being conveyed. That is, by passing the lower side of the burner 5 blowing the flame 6 downward while transporting the base material 1 with the aqueous enamel paint coating film 2 facing upward by a transport device 15 such as a belt conveyor, Frame processing can be performed. At this time, the conveying speed of the substrate 1 (the relative moving speed of the substrate 1 with respect to the burner 5) is preferably 3 to 20 m / min. If the conveyance speed of the substrate 1 is less than 3 m / min, foaming may occur in the water-based enamel coating film 2 and the color developability of the inkjet printing layer 3 may be reduced, and the conveyance speed of the substrate 1 is 20 m / min. If it is larger, sufficient frame treatment cannot be performed on the water-based enamel coating film 2 and the color developability of the inkjet printing layer 3 may be lowered. Further, the contact angle of water on the surface of the water-based enamel paint film 2 after the frame treatment is preferably 50 to 65 °, and the frame such as the contact time between the flame 6 and the water-based enamel paint film 2 is set so as to be this. Set the processing conditions. If the contact angle of water is less than 50 °, the water-based ink of the inkjet printing layer 3 is likely to bleed and good color development may not be obtained. If the contact angle is greater than 65 °, the inkjet printing layer 3 Since the water-based ink is repelled on the surface of the water-based enamel coating film 2 and becomes difficult to spread, there is a possibility that good color developability cannot be obtained.

  After performing the frame treatment as described above, the ink jet printing layer 3 is formed on the surface of the water-based enamel coating film 2. The ink-jet printing layer 3 is formed by printing the water-based ink dots 3a, 3a... With an ink-jet printer, and can be applied using, for example, an ink-jet printer as shown in FIG. The inkjet printer includes a painting nozzle head 8 provided with an ejection nozzle 7, a paint supply tank 9 that supplies 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 of the injection nozzles 7 is configured to perform injection or stop the injection by, for example, a piezo control method or a method of irradiating and controlling laser light to the photothermal exchange element. By controlling, the ejection and stop of each of the yellow, cyan, magenta, and black water-based inks can be individually controlled, and coating by full-color printing corresponding to the color pattern can be performed.

  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 which performed the frame process 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. In this way, the inkjet printing layer is applied to the surface of the aqueous enamel coating film 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. 3 can be formed. In the present invention, the discharge amount of the water-based ink is preferably 18 to 35 picoliters. The base material 1 coated in this way is further sent and carried out to the next process.

Thereafter, the clear coating film 4 can be formed by applying and drying a clear paint on the surface of the ink jet printing layer 3. At this time, the clear paint is preferably applied to the surface of the inkjet printing layer 3 at an application amount of 32 to 76 g / m ² . And it is preferable to perform baking drying on 80-140 degreeC and the conditions for 1-3 minutes, for example using a jet dryer. If the baking and drying are not performed sufficiently, the durability of the exterior material may be easily lowered depending on environmental conditions such as temperature and humidity. The clear paint can be applied using a spray gun, roll coater, flow coater, curtain coater, or the like.

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

[Base material]
As the base material, a ceramic base material prepared as follows was used. That is, first, 40 parts by mass of ordinary Portland cement, 40 parts by mass of fly ash, 6 parts by mass of pulp, and 14 parts by mass of pulverized cement board waste material are mixed, and water is mixed so that the solid content concentration becomes 20% by mass. A cement slurry was prepared by dispersing the mixture. Next, after making this cement slurry, press forming was performed to form a pattern, and a papermaking plate having a concavo-convex pattern was produced. The papermaking plate was steam-cured at 60 ° C. for 10 hours, and further autoclaved at 170 ° C. for 5 hours to produce a ceramic base material.

Also, a sealer coating was provided on one side of the ceramic base material. The sealer coating that forms the sealer coating consists of 25 parts by mass of acrylic emulsion resin, 20 parts by mass of pigment (made of titanium oxide, iron oxide pigment, carbon black, calcium carbonate), and additives (butyl cellosolve, antifoaming agent). 1) parts by mass and 54 parts by mass of water were added and stirred and dispersed. And the sealer coating material was apply | coated and dried on the surface of said ceramics-type base material, and the sealer coating film was formed. At this time, the sealer coating was applied to the surface of the substrate at an application amount of 54 g / m ² . The baking drying was performed using a jet dryer at 120 ° C. for 1.5 minutes.

[Water-based enamel paint]
As water-based enamel paint, 28 parts by mass of acrylic emulsion resin, 23 parts by mass of pigment (made of titanium oxide, iron oxide pigment, carbon black, barium sulfate), and additives (butyl cellosolve, antifoaming agent, thickener) ) 6.5 parts by mass and 42.5 parts by mass of water were added and stirred and dispersed.

[Water-based ink]
As the water-based ink for forming the ink jet printing layer, a water-based pigment ink manufactured by Matsushita Electric Works Chemicals was used. This water-based ink includes four types including phthalocyanine, petal, ocher and carbon as pigments, and includes 50 to 75 parts by mass of water and 2 to 8 parts by mass of pigment.

[Clear paint]
As clear paint, 34 parts by mass of acrylic emulsion resin, 1.7 parts by mass of additives (consisting of butyl cellosolve, benzotriazole UV absorber, antifoaming agent, thickener, hindered amine antioxidant), 64.3 water An aqueous acrylic emulsion paint prepared by adding parts by mass and stirring and dispersing was used.

[Production of decorative building boards of Examples 1 to 4 and Comparative Examples 1 and 2]
A water-based enamel coating was applied to the surface of the base sealer coating and dried to form a water-based enamel coating. At this time, the water-based enamel coating film was applied to the surface of the sealer coating film at a coating amount of 98 g / m ² , and baking drying was performed using a jet dryer at 120 ° C. for 2 minutes. Thereafter, a flame treatment was performed on the surface of the water-based enamel coating film. At this time, an LPG gas burner was used as the burner. Next, water-based ink was applied to the surface of the water-based enamel paint film after the frame treatment by ink jet printing. At this time, an ink jet printer manufactured by Mastermind was used, and the discharge amount was 20 picoliters. Then, a decorative building board (exterior material) as shown in FIG. 1 was produced by applying and drying a clear paint to form a clear coating film. At this time, the clear coating was applied to the surface of the enamel coating film at a coating amount of 54 g / m ² , and baking drying was performed using a jet dryer under conditions of 130 ° C. and 60 seconds. In addition, application | coating of each coating material was performed using the spray gun.

[Performance evaluation]
(1) Water contact angle The water contact angle of the water-based enamel paint film after frame treatment was measured. The contact angle of water was calculated by the θ / 2 method using a contact angle meter.
(2) Measurement of ink dot diameter The ink dot diameter of the inkjet printing layer was measured using a microscope.
(3) Appearance (color development)
The appearance of the resulting decorative building board was evaluated. Here, “◯” indicates that the gradation is expressed up to an ink density of 100%, and “Δ” indicates that the gradation is expressed up to an ink density of 80%, or slight film foaming is observed. "X" indicates that the gradation expression is an ink density of 50% or less or that the coating film has large foaming.

  The performance evaluation is shown in Table 1. Table 1 shows a column of “distance between flame and coating film”. This column shows the distance between the flame and the surface of the water-based enamel paint film during flame treatment. 0 mm indicates the state where the flame tip and the surface of the water-based enamel paint film are in contact with each other. And a water-based enamel paint film approached with a minus sign, and when moved away, a plus sign. The “conveyor speed” column indicates the substrate conveyance speed during frame processing.

  In Examples 1 to 4 in which the flame treatment was performed, the contact angle of water was smaller than in Comparative Examples 1 and 2 in which the flame was not in contact with the surface of the water-based enamel coating film and the flame treatment was not sufficiently performed. Thus, the water-based ink spreads to the originally assumed size without being repelled, and a sufficient dot diameter can be obtained. As a result, the appearance is improved. Further, in Example 4, the conveyor speed was too slow, the effect of the frame treatment was excessive, and foaming occurred in the aqueous enamel paint film, so the appearance was slightly degraded.

It is the schematic which shows an example of embodiment of this invention and shows frame processing. It is sectional drawing which shows an example of the decorative building board manufactured by this invention. It is the schematic which shows inkjet printing same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Water-based enamel coating film 3 Inkjet printing layer 5 Burner

Claims (3)

  A decorative building board comprising a water-based enamel coating film formed on the surface of a base material, a frame treatment applied to the surface of the water-based enamel coating film, and then an ink-jet printing layer formed with a water-based ink. Manufacturing method.   The method for producing a decorative building board according to claim 1, wherein the contact angle of water on the surface of the water-based enamel paint film after the frame treatment is 50 to 65 °. The method for producing a decorative building board according to claim 1 or 2, wherein a relative moving speed between the base material and the burner during the frame processing is 3 to 20 m / min.

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