JP2636693B2 - Manufacturing method of inorganic decorative board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an inorganic decorative board used in the field of interior and exterior materials for buildings.

[0002]

2. Description of the Related Art As a method for producing this kind of inorganic decorative board, the following production method has been known as a typical one. (A) Finish the inorganic plate with a smooth or uneven surface in a single color. (B) The entire surface of the inorganic plate with uneven surface is coated with paint,
Next, using a roll coater, a different color paint is applied only to the convex portions on the surface, and two-color finishing is performed. (C) The surface of the inorganic plate is finished with ricin or stucco. (D) A paint is applied to the surface of the inorganic plate, and while it is not dried, a color aggregate is scattered and adhered to the applied surface. (E) A paint is applied to the surface of the inorganic plate in the form of spots, and finished in a spotted pattern. (F) A paint containing a color aggregate is applied to the surface of the inorganic plate. (G) A semi-transparent colored paint is stored in a concave portion of an inorganic plate having an uneven surface, or wiped.

[0003]

However, in any of these manufacturing methods, it is difficult to form a desired arbitrary pattern with high accuracy and high reproducibility. Difficult for inorganic plates.

Therefore, the present applicant discharges ink (or paint) from the nozzles of an ink jet printer onto the surface of the inorganic plate during the process of transporting the surface of the inorganic plate on which the lower colored coating film is applied in advance by a conveyor. Proposed a method of manufacturing an inorganic decorative board for patterning the surface of the inorganic board. According to this method, a desired pattern can be formed on an inorganic plate having an uneven surface with reliable reproducibility. In this case, as a result of many experiments,
It has been found that what kind of solvent and how to use the resin and pigment conventionally used as ink (or paint) is an essential condition for solving the above problem. In other words, it was possible to confirm which solvent is a condition for forming a pattern capable of exhibiting the above-mentioned problem, in particular, high precision and high designability.

That is, the present applicant has confirmed that, when the specific evaporation rate of the solvent (by the weight method with butyl acetate as 100) is 50 or less, the ink droplets (or (Paint drop) spreads too much and the desired pattern is blurred, and above 380, the dot-like ink drop (or paint drop) does not spread, and the dot state is maintained as it is, solidifying and expected. Such a continuous linear or planar pattern cannot be formed.
In the case of the latter, it was also confirmed that drying was quick and nozzle clogging was likely to occur, which was not preferable. Further, considering the ink viscosity, the viscosity is 5 to 15 cps (20 cps).
(° C.), it was confirmed that it was difficult to form a normal ink droplet (or paint droplet).

[0006]

SUMMARY OF THE INVENTION The present invention has been made based on the above circumstances, and is an inorganic material having a high degree of design that can form a desired pattern with high accuracy and reproducibility. An object of the present invention is to provide a method for manufacturing a decorative board.

[0007]

Therefore, in the present invention,
In the process of transporting the inorganic plate having a surface coated with a lower colored coating film in advance by a conveyor, a jet nozzle arranged in parallel with the inkjet printer head disposed above the conveyor in the width direction of the conveyor, a resin, a coloring pigment, and A solvent having a specific evaporation rate of 50 to 380 (based on a weight method with normal butyl acetate being 100) as a main component, and a viscosity of 5 to 5
It is characterized in that 15 CPS (20 ° C.) ink is ejected onto the surface of the inorganic plate and patterned. In this case, in the present invention, the pattern data of the pattern corresponding to the pattern to be printed is stored in the computer in advance, and the ejection of the ink from the jet nozzle is controlled by the valve control device based on the control signal of the computer. It is characterized by performing. Further, in the present invention, a plurality of ink jet printer heads arranged before and after in the transport direction are ejected from the jet nozzles arranged in parallel in the width direction of the conveyor, and inks of different colors are discharged above the conveyor, thereby forming a multicolor pattern. It is characterized by attaching.

[0008] In this case, it is preferable to apply a clear paint on the entire surface of the inorganic decorative plate after patterning.

[0009]

EXAMPLES The production method of the present invention will be described below in detail. The inorganic plate treated in the present invention is a flexible board,
Various inorganic plates commonly used for construction, such as calcium silicate plate, gypsum slag perlite plate, wood chip cement plate, precast concrete plate, ALC plate, gypsum board, etc. It is. The above-mentioned inorganic plate may have a smooth surface, but it is more preferable to form an uneven portion on the surface by means such as embossing. This is because a considerably high degree of design can be expressed by a combination of the concavo-convex pattern and a colored pattern formed by ink described later.

[0010] As the above-mentioned inorganic plate, a plate whose surface is coated with a lower colored coating film in advance is used. As a paint for forming the lower colored coating film, a binder such as an acrylic resin type, an acrylic urethane resin type, an epoxy resin type, an acrylic epoxy resin type, a chlorinated polypropylene resin type, an alkali silicate type, or an alkyl silicate type is used. Various conventionally known inorganic decorative plate paints such as the organic solvent type and the aqueous type used can be used. The lower colored coating film described above is not limited to a single color painted finish on an inorganic plate, but may be a lower colored coating film with a pattern drawn in the above-described conventional method.

The ink (or paint) used in the present invention is a material having a viscosity of 5 to 15 cps (20 ° C.) containing a resin, a coloring pigment, and a solvent as main components. The resin is not particularly limited as long as it has good adhesion to the lower colored coating film described above, and conventionally known ink (or paint) resins can be used.

Specifically, various resins such as acrylic resin, vinyl resin, acrylic silicon resin, fluororesin, silicon resin, and chlorinated resin are mentioned as typical examples. As the coloring pigment, titanium oxide,
Iron oxide, composite oxides (nickel titanium, chromium titanium, bismuth vanadium, etc.), carbon black,
Various inorganic pigments such as graphite, and various organic pigments such as quinacridone, diketopyrrolopyrrole, benzimidazolone, isoindolinone, anthrapyramidine, phthalocyanine, sulene, and dioxazine are typical examples thereof. No.

Further, the above-mentioned solvent has a specific evaporation rate (by a weight method based on 100 parts of butyl acetate) of 50 to 38.
It is necessary to use those in the range of 0, preferably in the range of 80 to 200. Solvents having a specific evaporation rate in the above range include aromatic hydrocarbon solvents such as toluene and xylene; alcohol solvents such as ethyl alcohol, isopropyl alcohol, and isobutyl alcohol; normal propyl acetate, normal butyl acetate, and secondary butyl acetate. And ester-based solvents such as isobutyl acetate; and aliphatic hydrocarbon-based solvents such as petroleum benzine and rubber volatile oil. In the present invention, it is also possible to use a solvent having a specific evaporation rate outside the above-mentioned range in a range of 20% by weight or less based on the total solvent mainly composed of the above-mentioned specific solvent.

Ink (or paint) used in the present invention
Is composed mainly of the above-described resins, coloring pigments and solvents, and further, if necessary, blending extender pigments, dyes, conductivity adjusters, surfactants and the like. In this case, the ratio of each component is as follows: resin: 4 to 50
% By weight, coloring pigment: 1 to 30% by weight, solvent: 49 to 95
% By weight is appropriate. Then, after mixing and stirring the above components, the ink is filtered and purified using a filter having a pore size of about 1/10 or less with respect to the diameter of the nozzle in the ink jet printer used in the method of the present invention. Is obtained.

In this case, the ink (or paint) is used.
Has a viscosity of 5 to 15 cps (20 ° C.), preferably 6
１２12 cps (20 ° C.). If the viscosity is out of the above range, the ink (or paint) ejected from the nozzles is difficult to become a normal dot-shaped ink drop (or paint drop), which is not preferable. As another property of the ink (or paint), the surface tension is 20 to 60.
Dyne / cm, specific resistance: 200 to 3000 Ωcm, specific gravity: 0.8 to 3 are preferable.

In the present invention, a clear paint conventionally used for an inorganic decorative board can be applied to the clear paint used as a surface finish of the inorganic board without any particular limitation. That is, organic solvent type using a binder such as acrylic urethane resin type, acrylic epoxy resin type, acrylic melamine resin type, acrylic silicon resin type, acrylic fluororesin type, fluororesin type, silicone resin type, aqueous type, etc. A known clear paint (color) can be used.

As the ink jet printer used in the present invention, a conventionally known printer can be used, and the control method thereof is typically, for example, an on-demand method, a charge control method, or a method of discharging ink by a thermal head. It is mentioned as a thing.

Next, a method of manufacturing an inorganic decorative plate according to the present invention will be described in detail with reference to FIGS. 1 and 2 for an embodiment using an on-demand type inkjet printer by opening and closing a solenoid valve. . In the figure, reference numeral 1 denotes a conveyor on which an inorganic plate (hereinafter, simply referred to as a substrate) a provided with a lower colored coating film on an uneven surface is transported forward, and above the conveyor 1,
A printer head 2 of an inkjet printer (not shown in its entirety) is provided.
A plurality of nozzles 3 having a diameter of 0.1 to 0.4 mm are provided in the head 2 over the entire width of the conveyor 1 in a range of 1 to 5 m.
They are provided in a downward parallel arrangement at a pitch of m. In addition, the printer head 2 may be configured to correspond to the width of the conveyor 1 by a single unit. However, depending on the size of the substrate (that is, the width of the conveyor), a plurality of printer heads 2 may be used.
Of course, they may be arranged side by side. printer·
A pump 6 is connected to the head 2 to feed the ink 5 in the ink tank 4, and the ink tank 4 is connected via a relief valve 7.

Reference numeral 9 denotes valves for opening and closing the nozzles 3 provided below the printer head 2, respectively. The valves 9 are individually controlled by a valve controller 8. Reference numeral 10 denotes a pattern data storage unit that records a design to be printed and a design pattern corresponding to the design.
Is a control unit (computer) that issues a control signal to the valve control device 8 based on the pattern data input from the storage unit 10, and 12 is a unit that connects the projector 13 and the receiver 14 to the substrate transport path on the conveyor 1. , Which detect passage of the substrate a and transmit a detection signal to the control unit 11. Sign 1
Reference numeral 5 denotes an encoder connected to the drive roll 16 of the conveyor 1, which transmits a pulse to the control unit 11 at every minimum rotation angle of 360/2000, for example.
In the above description, the printer head 2 is fixed, but it is also possible to adopt a method in which the printer head 2 is controlled and operated in the width direction or the traveling direction of the substrate a.

Next, an example of the method of the present invention for patterning the substrate surface with an ink jet printer including such a control system will be described. Substrate a is 1-60m
/ Min, preferably 3 to 45 m / min, when conveyed over the conveyor 1, the sensor 12 detects that the front end of the substrate a has reached a predetermined position on the conveyor 1, A signal is transmitted to the control unit 11. On the other hand, a pulse is transmitted from the encoder 15 to the control unit 11 with the operation of the conveyor 1. The control unit 11 starts counting the pulses based on the signal from the sensor 12, and when the number of pulses reaches a set value stored in advance, thereafter, according to the number of pulses received within a predetermined range (time), The pattern data for the pattern is read from the storage unit 10, and a control signal based on the pattern data is sequentially transmitted to the valve control unit 8 to thereby control the opening and closing of the valve 9 individually by the valve control unit 8. I do. As a result, the ink 5 in the printer head 2 is 0.1 to 0.5 k.
It is fed at a pressure of g / cm ^{2 and} is discharged from the nozzle 3 when the valve 9 is opened to draw a pattern based on the pattern data on the surface of the substrate a. Since the surface of the substrate a and the tip of the nozzle 3 have a distance of about 0.5 to 4 cm,
Since they are not in contact with each other, even if there are irregularities on the substrate surface, the pattern can be drawn without any trouble.

When it is desired to form a multicolored pattern, the printer heads 2 are arranged in a plurality of stages in the conveying direction of the conveyor 1 and different color heads are provided in the respective printer heads 2 by the above-described supply method. Are supplied, and the ink is ejected in the same manner as described above. This makes it possible to extract a multicolor pattern on the surface of the substrate A. In the manufacturing method of the present invention, the surface of the substrate is patterned by the ink jet printer, and then dried.

In the present invention, in order to impart stain resistance and wear resistance to the surface of the obtained inorganic decorative plate,
Further, it is desirable to apply a clear paint. This clear coating is applied by means of a usual spray, roll coater, flow coater or the like.

Next, specific contents will be exemplified. Here, “parts” and “%” are shown on a weight basis. <Undercoat paint a> A mixed solvent solution of butyl acetate / xylene = 1/1 of a cooled diphenylmethane diisocyanate compound (solid content: 30%). <Undercoat paint b> methyl methacrylate / butyl acrylate / hydroxyethyl methacrylate = 70/20 /
Acrylic copolymer consisting of 10: 10 parts, hexamethylene diisocyanate trimethylolpropane adduct:
Composition comprising 4 parts, tolylene diisocyanate trimer: 3 parts, titanium white: 15 parts, kaolin: 8 parts, mica: 8 parts, barium sulfate: 4 parts, butyl acetate: 20 parts, and xylene: 28 parts. . <Intermediate coating c> The above acrylic copolymer: 20 parts, hexamethylene diisocyanate trimethylolpropane adduct: 4 parts, titanium white: 13 parts, iron oxide yellow: 0.32
Parts, iron oxide rust: 0.03 parts, carbon black: 0.0
A composition comprising 1 part, barium sulfate: 6 parts, talc: 4 parts, butyl acetate: 22 parts, and xylene: 30 parts. <Intermediate coating d> The above acrylic copolymer: 20 parts, hexamethylene diisocyanate trimethylolpropane adduct: 4 parts, titanium white: 12 parts, iron oxide yellow: 1.53
Parts, iron oxide rust: 0.35 parts, carbon black: 0.2
A composition comprising 6 parts, barium sulfate: 6 parts, talc: 4 parts, butyl acetate: 22 parts, and xylene: 30 parts. <Intermediate paint e> Styrene / methyl methacrylate / butyl methacrylate / hydroxyethyl methacrylate =
Acrylic copolymer consisting of 30/30/25/15: 2
5 parts, hexamethylene diisocyanate trimethylolpropane adduct: 7 parts, titanium white: 13 parts, iron oxide yellow: 0.32 parts, iron oxide rust: 0.03 parts, carbon black: 0.01 parts, barium sulfate: 10 1 part, butyl acetate: 18 parts, and xylene: 26 parts. <Clear paint f> Styrene / methyl methacrylate /
Acrylic copolymer consisting of butyl methacrylate / hydroxyethyl methacrylate = 20/40/30/10: 35 parts, hexamethylene diisocyanate trimethylolpropane adduct: 7 parts, silicon oxide: 3 parts, butyl acetate: 25 parts, and xylene : A composition consisting of 30 parts. <Ink 1> Acrylic copolymer varnish consisting of ethyl acrylate / hydroxyethyl methacrylate / styrene = 50/14/36 (solid content: 50%): 19.3 parts,
Titanium white: 8.0 parts, iron oxide yellow: 1.3 parts, iron oxide rust:
0.7 parts, carbon black: 0.7 parts, toluene: 2
8 parts, ethyl alcohol: viscosity of 7.0 parts consisting of 42 parts
ps (20 ° C.) composition. <Ink 2> The above varnish: 23.3 parts, titanium white: 6.
0 part, iron oxide yellow: 0.5 part, iron oxide rust: 0.1 part, carbon black: 0.1 part, toluene: 28 parts, ethyl alcohol: 42 parts, viscosity 7.2 cps (20 ° C.)
Composition. <Ink 3> A composition in which ethyl acetate (specific evaporation rate 485) was used instead of ethyl alcohol in ink 1. <Ink 4> A composition in which glycol monoethyl ether (specific evaporation rate 37) was used instead of ethyl alcohol in ink 1. (Examples 1 to 3 according to the present invention and Comparative Examples 1 and 2)
Under the conditions shown in Table 1, each of the inorganic decorative boards was manufactured. The inkjet printer used here is an on-demand printer that opens and closes the aforementioned solenoid valve. The evaluation of the obtained inorganic decorative plate was as shown in the lower part of Table 1.

[0024]

[Table 1]

[0025]

According to the present invention, as described in detail above, an arbitrary pattern can be formed on the surface of an inorganic plate with high accuracy and high reproducibility, and an ink jet printer is used. Therefore, the ink can be ejected from the nozzles to the moving inorganic plate without contact, and the pattern can be applied. Therefore, even if the surface of the inorganic plate has irregularities, the method of the present invention can be applied. Thus, an inorganic decorative board having a high degree of design can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an ink jet printer for realizing a manufacturing method according to the present invention and a control system thereof.

FIG. 2 is a schematic side view of the ink jet printer and the conveyor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveyor 2 Printer head 3 Nozzle 4 Ink tank 8 Valve control device 10 Storage part of pattern data 11 Control part (computer) a Inorganic plate

Claims (4)

(57) [Claims] In the process of transporting an inorganic plate having a surface coated with a lower colored coating film in advance by a conveyor, a jet nozzle arranged in parallel with an inkjet printer head arranged above the conveyor in a width direction of the conveyor, Resin, color pigment and specific evaporation rate
An ink having a viscosity of 5 to 15 CPS (20 ° C.) containing a solvent of 50 to 380 as a main component and having a viscosity of 5 to 15 CPS (20 ° C.) on the surface of the inorganic plate, and patterning the ink. Production method. 2. A method according to claim 1, wherein pattern data of a pattern corresponding to a pattern to be printed is stored in a computer in advance, and ejection of ink from a jet nozzle is controlled by a valve control device based on a control signal of said computer. A method for producing the inorganic decorative board according to claim 1. 3. A plurality of ink jet printer heads arranged before and after in the conveying direction are ejected from the jet nozzles arranged in parallel in the width direction of the conveyor above the conveyor to form a multicolor pattern. The method for producing an inorganic decorative board according to claim 1 or 2, wherein: 4. The method for producing an inorganic decorative board according to claim 1, wherein a clear paint is applied to the entire surface of the inorganic decorative board after the patterning.