JP2015098089A - Manufacturing method for three-dimensional molding, three-dimensional molding, three-dimensional molding manufacturing apparatus, control method for three-dimensional molding manufacturing apparatus and control program for three-dimensional molding manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-dimensional molding with high definition and capable of representing a clear color, and to provide a manufacturing method for a three-dimensional molding, a three-dimensional molding manufacturing apparatus, a control method for a three-dimensional molding manufacturing apparatus, and a control program for a three-dimensional molding manufacturing apparatus, capable of efficiently manufacturing a three-dimensional molding with high definition and capable of representing a clear color.SOLUTION: A manufacturing method for a three-dimensional molding manufactures a three-dimensional molding having a lamination of unit layers. The manufacturing method includes: a layer formation step of forming a layer of predetermined thickness A [μm] using a three-dimensional molding composition, including three-dimensional molding powder composed of a plurality of particles; and an ink discharge step of discharging ink containing a binding agent to the layer so as to form a unit layer. In the ink discharge step, two or more different types of ink are discharged to a discharge unit area which is narrower than A[μm] in a surface of a layer onto which the ink is discharged.

Description

  The present invention relates to a method for manufacturing a three-dimensional structure, a three-dimensional structure, a three-dimensional structure manufacturing apparatus, a control method for a three-dimensional structure manufacturing apparatus, and a control program for a three-dimensional structure manufacturing apparatus.

Conventionally, for example, a method of forming a three-dimensional structure based on a model of a three-dimensional object generated by three-dimensional CAD software or the like is known.
As one method for forming a three-dimensional structure, a lamination method is known. In the laminating method, in general, after a model of a three-dimensional object is divided into a number of two-dimensional cross-sectional layers, the cross-sectional members corresponding to each two-dimensional cross-sectional layer are sequentially formed, and the cross-sectional members are sequentially laminated to obtain the tertiary. Form the original model.

The lamination method can be formed immediately as long as there is a model of the 3D model to be modeled, and there is no need to create a mold prior to modeling. It is possible to form a shaped object. In addition, since thin plate-like cross-sectional members are laminated one by one, for example, even a complex object having an internal structure can be formed as an integrated shaped object without being divided into a plurality of parts. .
As one of such laminating methods, a technique for forming a three-dimensional structure while solidifying a powder with a binding liquid is known (see, for example, Patent Document 1). In this technology, when each layer is formed, color is imparted to the three-dimensional structure by discharging ink containing a colorant to a portion corresponding to the outer surface side of the three-dimensional structure. Yes.
However, in the conventional method for producing a three-dimensional structure, the resolution of the surface of the obtained three-dimensional structure cannot be sufficiently increased.

JP 2001-150556 A

  An object of the present invention is to provide a three-dimensional structure that has a high resolution and can express a clear color, and that can efficiently produce a three-dimensional structure that has a high resolution and a clear color expression. An object of the present invention is to provide a method for manufacturing an original model, a three-dimensional model manufacturing apparatus, a control method for a three-dimensional model manufacturing apparatus, and a control program for a three-dimensional model manufacturing apparatus.

Such an object is achieved by the present invention described below.
The method for producing a three-dimensional structure of the present invention is a method for producing a three-dimensional structure in which unit layers are laminated,
A layer forming step of forming a layer having a predetermined thickness A [μm] using a three-dimensional modeling composition including a three-dimensional modeling powder composed of a plurality of particles;
An ink ejection step of ejecting ink containing a binder to form the unit layer with respect to the layer;
In the ink ejection step, two or more different types of the ink are ejected into a discharge unit region narrower than A ² [μm ² ] on the surface of the layer on which the ink is ejected.
Thereby, the resolution of the surface of the three-dimensional structure can be increased, and clear color expression can be performed.

In the three-dimensional structure manufacturing method of the present invention, it is preferable that a plurality of the discharge unit regions are arranged from the outer edge to the inside of the unit layer.
Thereby, a gradation can be increased more and the resolution of the three-dimensional structure surface can be further increased. As a result, clearer color expression can be performed on the surface of the three-dimensional structure.

In the three-dimensional structure manufacturing method of the present invention, the thickness A of the layer is preferably 30 μm or more and 500 μm or less.
As a result, while making the productivity of the three-dimensional structure sufficiently excellent, the occurrence of unintentional irregularities in the produced three-dimensional structure is more effectively prevented, and the dimensional accuracy of the three-dimensional structure is improved. It can be made particularly excellent.
In the three-dimensional structure manufacturing method of the present invention, the A ² [μm ² ] is preferably smaller than twice the landing area of the ink.
Thereby, the resolution of the three-dimensional structure surface can be further increased.

In the three-dimensional structure manufacturing method of the present invention, the ink is any one of a colored ink containing any one of cyan, magenta, yellow, black, and white and a non-colored ink not containing a colorant. Preferably there is.
Thereby, a clearer color expression and a wider brightness expression can be performed on the surface of the three-dimensional structure.
The three-dimensional structure of the present invention is manufactured by the method for manufacturing a three-dimensional structure of the present invention.
Thereby, the resolution of the surface of the three-dimensional structure can be increased, and clear color expression can be performed.

The three-dimensional structure of the present invention is a three-dimensional structure in which unit layers are laminated,
A layer forming step of forming a layer having a predetermined thickness A [μm] using a composition for three-dimensional modeling including a powder for three-dimensional modeling composed of a plurality of particles, and bonding to the layer And an ink discharge step of discharging the ink containing the agent to form the unit layer.
In the ink ejection step, two or more different types of the inks are ejected in an ejection unit region narrower than A ² [μm ² ] on the surface of the layer on which the ink is ejected.
Thereby, the resolution of the surface of the three-dimensional structure can be increased, and clear color expression can be performed.

The three-dimensional structure manufacturing apparatus of the present invention is a three-dimensional structure manufacturing apparatus for manufacturing a three-dimensional structure in which unit layers are laminated,
A layer forming means for forming a layer having a predetermined thickness A [μm] using a three-dimensional modeling composition including a three-dimensional modeling powder composed of a plurality of particles;
An ink ejecting means for ejecting ink containing a binder to form the unit layer with respect to the layer;
The ink discharge means is configured to discharge two or more different types of ink in a discharge unit region narrower than A ² [μm ² ] on the surface of the layer on which the ink is discharged. To do.
Thereby, it is possible to manufacture a three-dimensional structure with high resolution and capable of vivid color expression.

The control method of the three-dimensional structure manufacturing apparatus of the present invention is a control method of a three-dimensional structure manufacturing apparatus for manufacturing a three-dimensional structure in which unit layers are laminated,
The three-dimensional structure manufacturing apparatus uses a three-dimensional structure forming composition including a three-dimensional structure forming powder composed of a plurality of particles to form a layer having a predetermined thickness A [μm]. When,
An ink ejecting means for ejecting ink containing a binder to form the unit layer with respect to the layer;
The ink discharge means is configured to discharge two or more different types of ink in a discharge unit area narrower than A ² [μm ² ] on the surface of the layer on which the ink is discharged. To do.
Thereby, it is possible to manufacture a three-dimensional structure with high resolution and capable of vivid color expression.

The control program for the three-dimensional structure manufacturing apparatus of the present invention is a control program for a three-dimensional structure manufacturing apparatus for manufacturing a three-dimensional structure in which unit layers are laminated,
The three-dimensional structure manufacturing apparatus uses a three-dimensional structure forming composition including a three-dimensional structure forming powder composed of a plurality of particles to form a layer having a predetermined thickness A [μm]. When,
An ink ejecting means for ejecting ink containing a binder to form the unit layer with respect to the layer;
The ink discharge means is configured to discharge two or more different types of ink in a discharge unit area narrower than A ² [μm ² ] on the surface of the layer on which the ink is discharged. To do.
Thereby, it is possible to manufacture a three-dimensional structure with high resolution and capable of vivid color expression.

It is a schematic diagram which shows each process about suitable embodiment of the manufacturing method of the three-dimensional structure of this invention. It is a schematic diagram which shows each process about suitable embodiment of the manufacturing method of the three-dimensional structure of this invention. It is sectional drawing which shows typically the state in the layer (composition for three-dimensional modeling) just before an ink provision process. It is sectional drawing which shows typically the state which particle | grains couple | bonded with the binder. It is a schematic diagram which shows the combination of the color in a discharge unit area | region. It is a schematic diagram which shows the state in which the discharge unit area | region was located in the inner direction of the layer. It is the schematic which shows the three-dimensional structure manufacturing apparatus which manufactures a three-dimensional structure. It is a block diagram of the control part which the three-dimensional structure manufacturing apparatus shown in FIG. 7 has.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1. First, a method for manufacturing a three-dimensional structure according to the present invention will be described.
FIGS. 1 and 2 are schematic diagrams showing each step in a preferred embodiment of the method for producing a three-dimensional structure of the present invention, and FIG. 3 is in a layer (a composition for three-dimensional structure) immediately before the ink application step. 4 is a cross-sectional view schematically showing a state in which particles are bound to each other by a binder, FIG. 5 is a schematic view showing a combination of colors in the discharge unit region, and FIG. These are schematic diagrams showing a state in which the discharge unit regions are arranged in the inner direction of the layer. 5 and 6, Y is yellow (yellow), M is reddish purple (magenta), C is indigo purple (cyan), BK is black (black), W is white (white), and CL is transparent (colored) None).

  As shown in FIGS. 1 and 2, the manufacturing method of the present embodiment uses a three-dimensional modeling composition containing a three-dimensional modeling powder composed of a plurality of particles, and has a predetermined thickness A [μm. A layer forming step (1 a, 1 d) for forming the layer 6 having the above, an ink applying step (1 b, 1 e) for applying the ink 4 containing the binder 44 to the layer 6 by the inkjet method, A curing step (1c, 1f) for curing the binder 44 contained in the applied ink 4 to form the unit layer 7. These steps are sequentially repeated. An unbound particle removal step (1h) for removing the particles 63 that are not bound by the binder 44 among the constituting particles 63 is provided.

<Layer formation process>
First, the layer 6 having a predetermined thickness A [μm] is formed on the modeling stage 80 using the composition for three-dimensional modeling (1a).
The three-dimensional modeling composition includes a water-soluble resin 64 together with a plurality of particles 63, as will be described in detail later. By including the water-soluble resin 64, the particles 63 can be bonded (temporarily fixed) to each other (see FIG. 3), and unintentional scattering of the particles can be effectively prevented. Thereby, an operator's safety and the improvement of the dimensional accuracy of the three-dimensional structure 1 manufactured can be aimed at.

This step can be performed, for example, by using a method such as a squeegee method, a screen printing method, a doctor blade method, or a spin coating method.
Although the thickness of the layer 6 formed at this process is not specifically limited, It is preferable that they are 30 micrometers or more and 500 micrometers or less, and it is more preferable that they are 70 micrometers or more and 150 micrometers or less. Thereby, while making the productivity of the three-dimensional structure 1 sufficiently excellent, the occurrence of unintentional irregularities in the manufactured three-dimensional structure 1 is more effectively prevented, and the three-dimensional structure 1 The dimensional accuracy can be made particularly excellent.

  In addition, for example, when the composition for three-dimensional modeling forms a solid (pellet) (for example, the composition for three-dimensional modeling forms a solid in the vicinity of a storage temperature (for example, room temperature (25 ° C.)). A water-soluble resin (thermoplastic resin) 12 containing a plurality of particles 63 combined with the water-soluble resin), prior to layer formation as described above, for three-dimensional modeling The composition may be melted by heating to a fluid state. Thereby, layer formation can be efficiently performed by the simple method as described above, and unintentional variations in the thickness of the formed layer 6 can be more effectively prevented. As a result, the three-dimensional structure 1 with higher dimensional accuracy can be manufactured with higher productivity.

<Ink application process>
Thereafter, the ink 4 containing the binder 44 is applied to the layer 6 by an inkjet method (1b).
In this step, ink is selectively applied only to a portion of the layer 6 that corresponds to the real part (substantial portion) of the three-dimensional structure 1.

  Thereby, it can couple | bond firmly with the binder 44 of the particles 63 which comprise the layer 6, and can make the mechanical strength of the three-dimensional structure 1 finally obtained excellent. Further, when the composition for three-dimensional modeling constituting the layer 6 includes a plurality of porous particles 63, the binder 44 enters the pores 611 of the particles 63, and an anchor effect is exhibited. As a result, the bonding force (bonding force via the bonding agent 44) of the particles 63 can be made excellent, and the mechanical strength of the finally obtained three-dimensional structure 1 is made excellent. (See FIG. 4). Further, the binder 44 constituting the ink 4 applied in this step enters the pores 611 of the particles 63, so that it is possible to effectively prevent unintentional wetting and spreading of the ink. As a result, the dimensional accuracy of the finally obtained three-dimensional structure 1 can be increased.

In this step, since the ink 4 is applied by the ink jet method, the ink 4 can be applied with good reproducibility even if the application pattern of the ink 4 has a fine shape. As a result, the dimensional accuracy of the finally obtained three-dimensional structure 1 can be made particularly high in combination with the effect of the binder 44 entering the pores 611 of the particles 63.
Moreover, in this process, the ink 4 containing a coloring agent is discharged to the layer 6 corresponding to the outer edge side of the three-dimensional structure 1 for the purpose of coloring.
In this step, the layer 6 corresponding to the vicinity of the outer edge of the three-dimensional structure 1 is divided into a plurality of discharge unit regions for discharging the ink 4, and the ink 4 is applied to the discharge unit region.

The present invention is characterized in that two or more different colors of ink are ejected in an ejection unit region narrower than A ² [μm ² ] on the surface on which the ink is ejected in the ink ejection process. . Thereby, various color combinations can be performed in the discharge unit region. In addition, the gradation can be increased and the resolution can be increased. As a result, it is possible to manufacture a three-dimensional structure that can express a clear color.

Ink of various colors can be ejected to the ejection unit area. In the present invention, various colors include colorless (transparent and translucent).
The constituent material of the ink 4 will be described in detail later. The ink 4 can be any one of a colored ink containing any one of cyan, magenta, yellow, black, and white and a non-colored ink containing no colorant. It is preferable that it is comprised. Thereby, in addition to a clearer color expression, a wider lightness expression can be performed on the surface of the three-dimensional structure.

  For example, yellow and colorless as shown in FIG. 5 (1), magenta and colorless as shown in FIG. 5 (2), and as shown in FIG. Cyan and colorless, yellow and magenta and colorless as shown in FIG. 5 (4), yellow and cyan and colorless as shown in FIG. 5 (5), magenta and cyan and colorless as shown in FIG. Yellow, magenta, and cyan as shown in 5 (7), yellow, white, and colorless as shown in FIG. 5 (8), yellow, white, and black as shown in FIG. 5 (9), and in FIG. 5 (10). Yellow, magenta and white as shown, yellow, magenta and black as shown in FIG. 5 (11), white, white and white as shown in FIG. 5 (12), black as shown in FIG. 5 (13) White and Wight, mention may be made of FIG. 5 (14) Black and white and colorless as shown by the black and colorless and colorless like as shown in FIG. 5 (15). The combination is not limited to this.

In addition, it is preferable that a plurality of discharge unit regions are arranged from the outer edge of the layer 6 (unit layer 7) toward the inside (the internal direction of the three-dimensional structure 1). Thereby, a gradation can be increased more and the resolution of the three-dimensional structure surface can be further increased. As a result, clearer color expression can be performed on the surface of the three-dimensional structure.
As the arrangement of the discharge unit regions, for example, as shown in FIG. 6A, a configuration in which three discharge regions composed of yellow, magenta, and colorless are arranged from the surface side of the three-dimensional structure, or FIG. ), Two discharge areas composed of yellow, cyan, and colorless are arranged from the surface side of the three-dimensional structure, and thereafter, ejection areas composed of yellow and colorless are arranged.

A ² [μm ² ] is preferably smaller than twice the landing area of the ink 4. Thereby, the resolution of the three-dimensional structure surface can be further increased.
Landing area of the ink 4 is preferably 70 [mu] m ² or more 18000Myuemu ² or less, more preferably 700 .mu.m ² or more 8000Myuemu ² or less. Thereby, the resolution of the three-dimensional structure surface can be further increased.

<Curing process>
Thereafter, the binder 44 applied to the layer 6 is cured to form a unit layer (cured part) 7 (1c). Thereby, the bond strength between the binder 44 and the particles 63 can be made particularly excellent, and as a result, the mechanical strength of the finally obtained three-dimensional structure 1 can be made particularly excellent. it can.

Although this step varies depending on the type of the binder 44, for example, when the binder 44 is a thermosetting resin, it can be performed by heating, and when the binder 44 is a photocurable resin, by irradiation with corresponding light. (For example, when the binder 44 is an ultraviolet curable resin, it can be performed by irradiation with ultraviolet rays).
The ink application process and the curing process may be performed simultaneously. That is, before the entire pattern of one entire layer 6 is formed, the curing reaction may be sequentially advanced from the portion where the ink 4 is applied.

Thereafter, the series of steps described above is repeated (see 1d, 1e, and 1f). As a result, among the layers 6, the particles 63 to which the ink 4 has been applied are combined, and the three-dimensional structure 1 is obtained as a stacked body in which a plurality of such layers 6 are stacked ( 1g).
In addition, the ink 4 applied to the layer 6 in the second and subsequent ink application steps (see 1d) is used to bond the particles 63 constituting the layer 6, and part of the applied ink 4 is Infiltrate the lower layer 6. For this reason, the ink 4 is used not only for bonding the particles 63 in each layer 6 but also for bonding the particles 63 between adjacent layers. As a result, the finally obtained three-dimensional structure 1 is excellent in overall mechanical strength.

<Unbound particle removal step>
Then, after repeating the series of steps as described above, as a post-treatment step, among the particles 63 constituting each layer 6, unbound particles that remove particles not bound by the binder 44 (unbound particles) are removed. A removal step (1h) is performed. Thereby, the three-dimensional structure 1 is taken out.
As a specific method of this step, for example, a method of removing unbound particles with a brush, a method of removing unbound particles by suction, a method of blowing a gas such as air, a method of applying a liquid such as water ( Examples thereof include a method of immersing the laminate obtained as described above in a liquid, a method of spraying a liquid, and a method of applying vibration such as ultrasonic vibration. Moreover, it can carry out combining 2 or more types of methods selected from these. More specifically, there are a method of immersing in a liquid such as water after blowing a gas such as air, a method of applying ultrasonic vibration in a state of immersing in a liquid such as water, and the like. Especially, it is preferable to employ | adopt the method (especially the method of immersing in the liquid containing water) which provides the liquid containing water with respect to the laminated body obtained as mentioned above. As a result, particles 63 constituting each layer 6 that are not bound by the binder 44 are also temporarily fixed by the water-soluble resin 64, but by using a liquid containing water, the water-soluble resin 64 is changed. It melt | dissolves, the above temporary fixation is cancelled | released, and it can remove from the three-dimensional structure 1 more easily and more reliably. In addition, it is possible to more reliably prevent defects such as scratches from occurring in the three-dimensional structure 1 when removing unbound particles. In addition, by adopting such a method, the three-dimensional structure 1 can be washed.
The three-dimensional structure manufactured by the manufacturing method as described above has a high-resolution clear color on its surface.

2. Next, the three-dimensional structure manufacturing apparatus 100 according to the present embodiment will be described.
FIG. 7 is a schematic diagram illustrating a three-dimensional structure manufacturing apparatus for manufacturing a three-dimensional structure. FIG. 8 is a block diagram of a control unit included in the three-dimensional structure manufacturing apparatus shown in FIG.
The three-dimensional structure manufacturing apparatus 100 is an apparatus that is applied to the above-described method for manufacturing a three-dimensional structure, generates a model of the unit layer 7, and sequentially forms each unit layer 7 based on the model. The apparatus forms the three-dimensional structure 1 by sequentially laminating the unit layers 7.
As shown in FIGS. 7 and 8, the three-dimensional structure manufacturing apparatus 100 includes a computer 20 that generates a model of the unit layer 7 and a modeling unit 30 that forms the three-dimensional structure 1. .

Hereinafter, each part which comprises the three-dimensional structure manufacturing apparatus 100 is demonstrated in detail.
[Modeling unit 30]
As illustrated in FIG. 7, the modeling unit 30 includes an ink discharge unit (ink discharge unit) 40, a powder supply unit 50, a powder control unit 60, a light source 70, and a modeling stage 80 that are electrically connected to the computer 20. Yes.

  The ink discharge unit 40 is mounted with a droplet discharge head 41 that discharges the droplets of the ink 4 by an inkjet method. The ink ejection unit 40 includes an ink supply unit (not shown). In the present embodiment, a so-called piezoelectric drive type droplet discharge head 41 is employed. The droplet discharge head 41 is configured to be able to change the discharge amount of the ink 4 in accordance with a command from the control unit 21 described later.

The ink discharge unit 40 includes an X-direction moving unit 42 and a Y-direction moving unit 43 that move the droplet discharge head 41 on the XY plane.
The powder supply unit 50 has a function of supplying three-dimensional modeling powder (hereinafter also simply referred to as powder) to the modeling stage 80 described later. The powder supply unit 50 is configured to be driven by a powder supply unit driving means (not shown).

The powder control unit 60 includes a blade 61 and a guide rail 62 that regulates the operation of the blade 61. The powder control unit 60 has a function of controlling the powder supplied from the powder supply unit 50 by the blade 61 and forming a layer 6 having a predetermined thickness A [μm] made of powder on the modeling stage 80. ing.
The blade 61 is long in the Y direction and has a blade-like shape with a pointed lower end. The blade 61 is configured to be driven in the X direction along the guide rail 62 by blade driving means (not shown).

The powder supply unit 50 and the powder control unit 60 constitute layer forming means.
The light source 70 has a function of curing the ink 4 applied to the powder layer formed by the powder control unit.
The light source 70 is configured to emit ultraviolet light. As the light source 70, for example, a mercury lamp, a metal halide lamp, a xenon lamp, an excimer lamp, or the like can be employed.

The modeling stage 80 has a rectangular shape in the XY cross section. The unit layer 7 is formed by combining the powder with the ink 4 on the modeling stage 80.
The modeling stage 80 can be moved in the Z direction by a modeling stage driving means (not shown).
The modeling stage 80 moves downward by the thickness of the layer 6 to be formed, and the layer 6 is formed there by the powder supply unit 50 and the powder control unit 60.

The modeling unit 30 includes a drive control unit (not shown).
The drive control unit includes a motor control unit, a position detection control unit, a powder supply control unit, a discharge control unit, and an exposure control unit.
The motor control unit individually controls driving of the droplet discharge head 41 in the XY direction, driving of the blade 61, and driving of the modeling stage 80 based on a command from a CPU of the computer 20 described later.

The position detection control unit individually controls the position of the droplet discharge head 41, the position of the blade 61, and the position of the modeling stage 80 based on a command from the CPU.
The powder supply control unit controls driving (powder supply) of the powder supply unit 50 based on a command from the CPU.
The discharge control unit controls the drive (droplet discharge) of the droplet discharge head 41 based on a command from the CPU.
The exposure control unit controls the light emission state of the light source 70 based on a command from the CPU.

[Computer 20]
As illustrated in FIG. 8, the computer 20 includes a control unit 21 that controls the operation of each unit of the modeling unit 30, a reception unit 24, and an image generation unit 25.
The control unit 21 includes a CPU (Central Processing Unit) 22 and a storage unit 23.
The CPU 22 performs various arithmetic processes as a processor and executes the control program 231.

  The storage unit 23 includes a ROM (Read Only Memory), a RAM (Randam Access Memory), and the like. In the storage unit 23, an area for storing a control program 231 in which a control procedure of the operation in the modeling unit 30 is described, a data development unit 232 that is a region for temporarily developing various data, and the like are set. The storage unit 23 is connected to the CPU 22 via the data bus 29.

  In addition, an image generation unit 25 and a reception unit 24 are connected to the control unit 21 via a data bus 29. In addition, a drive control unit of the modeling unit 30 is connected to the control unit 21 via an input / output interface 28 and a data bus 29. In addition, the above-described powder supply unit driving unit, modeling stage driving unit, blade driving unit, droplet discharge head, and light source are connected to the drive control unit via an input / output interface 28 and a data bus 29, respectively. Yes.

The image generation unit 25 has a function of manufacturing a model or the like of the three-dimensional structure 1. The image generation unit 25 includes software that generates a three-dimensional object such as a three-dimensional CAD (computer-aided design).
The image generation unit 25 has a three-dimensional structure model generation function for generating a model of the three-dimensional structure 1 and an outer surface of the model of the three-dimensional structure 1 such as STL (Standard Triangulated Language). It has a function of generating a two-dimensional model expressed by a two-dimensional model such as a square. That is, the image generation unit 25 has a function of generating three-dimensional shape data of the three-dimensional structure 1.

Further, the image generation unit 25 has a function of generating a model of the unit layer 7 by cutting the model of the three-dimensional structure 1 into layers.
The unit layer data generated by the image generation unit 25 is stored in the storage unit 23 and transmitted to the drive control unit of the modeling unit 30 via the input / output interface 28 and the data bus 29. The modeling unit 30 is driven based on the transmitted unit layer data.

The receiving unit 24 includes a USB (Universal Serial BUS) port, a LAN port, and the like. The receiving unit 24 has a function of receiving an original object for generating a model of the three-dimensional structure 1 from an external device (not shown) such as a scanner.
The computer 20 is connected to a monitor (display device) and a keyboard (input device) (not shown). The monitor and the keyboard are connected to the control unit 21 via an input / output interface and a data bus, respectively.

The monitor has a function of displaying the image file acquired by the receiving unit 24 in the image display area. By providing a monitor, an operator can visually grasp an image file or the like.
The input device is not limited to a keyboard, and may be a mouse, a trackball, a touch panel, or the like.

  In the three-dimensional structure manufacturing apparatus 100 as described above, first, unit layer data is generated based on the three-dimensional shape data, and the three-dimensional structure forming powder (third order) is formed on the modeling stage 80 based on the unit layer data. The layer 6 of the three-dimensional modeling composition including the original modeling powder) is formed, and further, the ink 4 is applied to form the unit layer 7, and the formed unit layer 7 is sequentially laminated a plurality of times to obtain the tertiary An original model 1 is obtained.

The three-dimensional structure manufacturing apparatus 100 as described above applies two or more different color inks 4 to the discharge unit area narrower than A ² [μm ² ] on the surface of the layer 6 on which the ink 4 is discharged. It is comprised so that it may discharge. In other words, there is a control program in which the ink discharge means discharges two or more different colors of ink 4 in a discharge unit area smaller than A ² [μm ² ] on the surface of the layer 6 on which the ink 4 is discharged. It is recorded in the storage unit 23.

3. Next, the three-dimensional modeling composition will be described in detail.
The three-dimensional modeling composition includes a three-dimensional modeling powder and a water-soluble resin 64.
Hereinafter, each component will be described in detail.
≪Powder for 3D modeling≫
The three-dimensional modeling powder is composed of a plurality of particles 63.

Any particles can be used as the particles 63, but the particles 63 are preferably composed of porous particles (porous particles). Thereby, when manufacturing the three-dimensional structure 1, the binder 44 can be suitably penetrated into the pores, and as a result, it is preferably used for manufacturing a three-dimensional structure excellent in mechanical strength. Can do.
Examples of the constituent material of the porous particles constituting the three-dimensional modeling powder include inorganic materials, organic materials, and composites thereof.

  Examples of the inorganic material constituting the porous particles include various metals and metal compounds. Examples of the metal compound include various metal oxides such as silica, alumina, titanium oxide, zinc oxide, zircon oxide, tin oxide, magnesium oxide, and potassium titanate; various kinds such as magnesium hydroxide, aluminum hydroxide, and calcium hydroxide. Metal hydroxides; various metal nitrides such as silicon nitride, titanium nitride and aluminum nitride; various metal carbides such as silicon carbide and titanium carbide; various metal sulfides such as zinc sulfide; various metals such as calcium carbonate and magnesium carbonate Carbonates; sulfates of various metals such as calcium sulfate and magnesium sulfate; silicates of various metals such as calcium silicate and magnesium silicate; phosphates of various metals such as calcium phosphate; aluminum borate, magnesium borate, etc. And various metal borates and composites thereof.

  Examples of the organic material constituting the porous particles include synthetic resins and natural polymers. More specifically, polyethylene resins; polypropylene; polyethylene oxide; polypropylene oxide, polyethyleneimine; polystyrene; polyurethane; Polyester; Silicone resin; Acrylic silicone resin; Polymer having (meth) acrylic acid ester such as polymethyl methacrylate as a constituent monomer; Cross polymer having (meth) acrylic acid ester as a constituent monomer such as methyl methacrylate crosspolymer ( Ethylene acrylic acid copolymer resin, etc.); polyamide resin such as nylon 12, nylon 6, copolymer nylon; polyimide; carboxymethylcellulose; gelatin; starch; chitin;

  Among these, the porous particles are preferably composed of an inorganic material, more preferably composed of a metal oxide, and further preferably composed of silica. Thereby, the characteristics such as mechanical strength and light resistance of the three-dimensional structure can be made particularly excellent. In particular, when the porous particles are composed of silica, the effects described above are more remarkably exhibited. In addition, since silica is excellent in fluidity, it is advantageous for forming a layer having higher thickness uniformity, and the productivity and dimensional accuracy of the three-dimensional structure 1 are particularly excellent. Can do.

  As silica, commercially available products can be suitably used. Specifically, for example, Mizukacil P-526, Mizukacil P-801, Mizukacil NP-8, Mizukacil P-802, Mizukacil P-802Y, Mizukacil C-212, Mizukacil P-73, Mizukacil P-78A, Mizukacil P- 78F, Mizukacil P-87, Mizukacil P-705, Mizukacil P-707, Mizukacil P-707D, Mizukacil P-709, Mizukacil C-402, Mizukacil C-484 (above, made by Mizusawa Chemical Co., Ltd.), Toxeal U , Tok Seal UR, Tok Seal GU, Tok Seal AL-1, Tok Seal GU-N, Tok Seal N, Tok Seal NR, Tok Seal PR, Sorex, Fine Seal E-50, Fine Seal T-32, Fine Seal X-30, Fine Seal X -37, Fine seal X-37B Fine seal X-45, fine seal X-60, fine seal X-70, fine seal RX-70, fine seal A, fine seal B (manufactured by Tokuyama Corporation), Sipernato, Carplex FPS-101, Car Plex CS-7, Carplex 22S, Carplex 80, Carplex 80D, Carplex XR, Carplex 67 (manufactured by DSL Japan Co., Ltd.), Syloid 63, Syloid 65, Syloid 66, Syloid 77, Syloid 74 Syloid 79, Syloid 404, Syloid 620, Syloid 800, Syloid 150, Syloid 244, Syroid 266 (above, manufactured by Fuji Silysia Chemical Co., Ltd.), Nipgel AY-200, Nipgel AY-6A2, Nipsey Nip gel AZ-6200, nip gel BY-200, nip gel BY-200, nip gel CX-200, nip gel CY-200, nip seal E-150J, nip seal E-220A, nip seal E-200A (above, Tosoh silica Etc.).

  Moreover, it is preferable that the porous particles have been subjected to a hydrophobic treatment. By the way, generally, the binder 44 contained in the ink 4 tends to have hydrophobicity. Therefore, since the porous particles have been subjected to a hydrophobic treatment, the binder 44 can be more suitably penetrated into the pores of the porous particles. As a result, the anchor effect is more remarkably exhibited and the mechanical strength of the obtained three-dimensional structure 1 can be further improved. Moreover, if the porous particles have been subjected to a hydrophobic treatment, they can be suitably reused. More specifically, if the porous particles are hydrophobized, the affinity between the water-soluble resin and the porous particles, which will be described in detail later, is reduced, so that the porous particles are prevented from entering the pores. It becomes. As a result, in the production of the three-dimensional structure 1, the porous particles in the region where the ink has not been applied can be easily removed by washing with water or the like, and can be recovered with high purity. For this reason, the collected three-dimensional modeling powder is mixed with a water-soluble resin or the like at a predetermined ratio again to obtain a three-dimensional modeling powder that is reliably controlled to have a desired composition.

  The hydrophobization treatment applied to the porous particles constituting the three-dimensional modeling powder may be any treatment that increases the hydrophobicity of the porous particles, but introduces a hydrocarbon group. Is preferred. Thereby, the hydrophobicity of the particles can be made higher. In addition, the uniformity of the degree of the hydrophobization treatment at each particle or each part of the particle surface (including the surface inside the pores) can be made higher and more easily and reliably.

As a compound used for the hydrophobizing treatment, a silane compound containing a silyl group is preferable. Specific examples of compounds that can be used in the hydrophobization treatment include, for example, hexamethyldisilazane, dimethyldimethoxysilane, diethyldiethoxysilane, 1-propenylmethyldichlorosilane, propyldimethylchlorosilane, propylmethyldichlorosilane, and propyltrichlorosilane. , Propyltriethoxysilane, propyltrimethoxysilane, styrylethyltrimethoxysilane, tetradecyltrichlorosilane, 3-thiocyanatepropyltriethoxysilane, p-tolyldimethylchlorosilane, p-tolylmethyldichlorosilane, p-tolyltrichlorosilane, p -Tolyltrimethoxysilane, p-tolyltriethoxysilane, di-n-propyldi-n-propoxysilane, diisopropyldiisopropoxysilane, di-n- Tildi-n-butyroxysilane, di-sec-butyldi-sec-butyroxysilane, di-t-butyldi-t-butyloxysilane, octadecyltrichlorosilane, octadecylmethyldiethoxysilane, octadecyltriethoxysilane, octadecyltrimethoxysilane, octadecyldimethylchlorosilane, Octadecylmethyldichlorosilane, octadecylmethoxydichlorosilane, 7-octenyldimethylchlorosilane, 7-octenyltrichlorosilane, 7-octenyltrimethoxysilane, octylmethyldichlorosilane, octyldimethylchlorosilane, octyltrichlorosilane, 10-undecenyl Dimethylchlorosilane, undecyltrichlorosilane, vinyldimethylchlorosilane, methyloctadecyldimethoxy Orchid, methyldodecyldiethoxysilane, methyloctadecyldimethoxysilane, methyloctadecyldiethoxysilane, n-octylmethyldimethoxysilane, n-octylmethyldiethoxysilane, triacontyldimethylchlorosilane, triaconyltrichlorosilane, methyltrimethoxysilane, Methyl triethoxysilane, methyl tri-n-propoxy silane, methyl isopropoxy silane, methyl-n-butoxy silane, methyl tri-sec-butoxy silane, methyl tri-t-butoxy silane, ethyl trimethoxy silane, ethyl triethoxy silane, ethyl tri-n-propoxy Silane, ethyl isopropoxy silane, ethyl-n-butyroxy silane, ethyl tri-sec-butyloxy silane, ethyl tri-t-butyl Tyroxysilane, n-propyltrimethoxysilane, isobutyltrimethoxysilane, n-hexyltrimethoxysilane, hexadecyltrimethoxysilane, n-octyltrimethoxysilane, n-dodecyltrimethoxysilane, n-octadecyltrimethoxysilane, n- Propyltriethoxysilane, isobutyltriethoxysilane, n-hexyltriethoxysilane, hexadecyltriethoxysilane, n-octyltriethoxysilane, n-dodecyltrimethoxysilane, n-octadecyltriethoxysilane, 2- [2- ( Trichlorosilyl) ethyl] pyridine, 4- [2- (trichlorosilyl) ethyl] pyridine, diphenyldimethoxysilane, diphenyldiethoxysilane, 1,3- (trichlorosilylmethyl) heptacosane Dibenzyldimethoxysilane, dibenzyldiethoxysilane, phenyltrimethoxysilane, phenylmethyldimethoxysilane, phenyldimethylmethoxysilane, phenyldimethoxysilane, phenyldiethoxysilane, phenylmethyldiethoxysilane, phenyldimethylethoxysilane, benzyltriethoxysilane , Benzyltrimethoxysilane, benzylmethyldimethoxysilane, benzyldimethylmethoxysilane, benzyldimethoxysilane, benzyldiethoxysilane, benzylmethyldiethoxysilane, benzyldimethylethoxysilane, benzyltriethoxysilane, dibenzyldimethoxysilane, dibenzyldiethoxy Silane, 3-acetoxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane , Allyltrimethoxysilane, allyltriethoxysilane, 4-aminobutyltriethoxysilane, (aminoethylaminomethyl) phenethyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, 6- (aminohexylaminopropyl) trimethoxysilane, p-aminophenyltrimethoxysilane, p-aminophenylethoxysilane, m-aminophenyltrimethoxysilane, m-aminophenylethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, ω-aminoundecyltrimethoxysilane, amyltriethoxysilane, benzoxacilepine dimethyl ester, 5 (Bicycloheptenyl) triethoxysilane, bis (2-hydroxyethyl) -3-aminopropyltriethoxysilane, 8-bromooctyltrimethoxysilane, bromophenyltrimethoxysilane, 3-bromopropyltrimethoxysilane, n-butyl Trimethoxysilane, 2-chloromethyltriethoxysilane, chloromethylmethyldiethoxysilane, chloromethylmethyldiisopropoxysilane, p- (chloromethyl) phenyltrimethoxysilane, chloromethyltriethoxysilane, chlorophenyltriethoxysilane, 3 -Chloropropylmethyldimethoxysilane, 3-chloropropyltriethoxysilane, 3-chloropropyltrimethoxysilane, 2- (4-chlorosulfonylphenyl) ethyltrimethoxysilane, 2-silane Noethyltriethoxysilane, 2-cyanoethyltrimethoxysilane, cyanomethylphenethyltriethoxysilane, 3-cyanopropyltriethoxysilane, 2- (3-cyclohexenyl) ethyltrimethoxysilane, 2- (3-cyclohexenyl) ethyl Triethoxysilane, 3-cyclohexenyltrichlorosilane, 2- (3-cyclohexenyl) ethyltrichlorosilane, 2- (3-cyclohexenyl) ethyldimethylchlorosilane, 2- (3-cyclohexenyl) ethylmethyldichlorosilane , Cyclohexyldimethylchlorosilane, cyclohexylethyldimethoxysilane, cyclohexylmethyldichlorosilane, cyclohexylmethyldimethoxysilane, (cyclohexylmethyl) trichlorosilane, cyclohexyltri Chlorosilane, cyclohexyltrimethoxysilane, cyclooctyltrichlorosilane, (4-cyclooctenyl) trichlorosilane, cyclopentyltrichlorosilane, cyclopentyltrimethoxysilane, 1,1-diethoxy-1-silacyclopent-3-ene, 3- (2, 4-dinitrophenylamino) propyltriethoxysilane, (dimethylchlorosilyl) methyl-7,7-dimethylnorpinane, (cyclohexylaminomethyl) methyldiethoxysilane, (3-cyclopentadienylpropyl) triethoxysilane, N , N-diethyl-3-aminopropyl) trimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, Furyloxymethyl) triethoxysilane, 2-hydroxy-4- (3-triethoxypropoxy) diphenylketone, 3- (p-methoxyphenyl) propylmethyldichlorosilane, 3- (p-methoxyphenyl) propyltrichlorosilane, p -(Methylphenethyl) methyldichlorosilane, p- (methylphenethyl) trichlorosilane, p- (methylphenethyl) dimethylchlorosilane, 3-morpholinopropyltrimethoxysilane, (3-glycidoxypropyl) methyldiethoxysilane, 3 -Glycidoxypropyltrimethoxysilane, 1,2,3,4,7,7, -hexachloro-6-methyldiethoxysilyl-2-norbornene, 1,2,3,4,7,7, -hexachloro- 6-triethoxysilyl-2-norbornene, 3 Iodopropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, (mercaptomethyl) methyldiethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyldimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-methacryloxy Propylmethyldiethoxysilane, 3-methacryloxypropyltrimethoxysilane, methyl {2- (3-trimethoxysilylpropylamino) ethylamino} -3-propionate, 7-octenyltrimethoxysilane, RN-α- Phenethyl-N′-triethoxysilylpropylurea, S—N-α-phenethyl-N′-triethoxysilylpropylurea, phenethyltrimethoxysilane, phenethylmethyldimethoxysilane, phenethyl Dimethylmethoxysilane, phenethyldimethoxysilane, phenethyldiethoxysilane, phenethylmethyldiethoxysilane, phenethyldimethylethoxysilane, phenethyltriethoxysilane, (3-phenylpropyl) dimethylchlorosilane, (3-phenylpropyl) methyldichlorosilane, N- Phenylaminopropyltrimethoxysilane, N- (triethoxysilylpropyl) dansilamide, N- (3-triethoxysilylpropyl) -4,5-dihydroimidazole, 2- (triethoxysilylethyl) -5- (chloroacetoxy) ) Bicycloheptane, (S) -N-triethoxysilylpropyl-O-mentcarbamate, 3- (triethoxysilylpropyl) -p-nitrobenzamide, 3- (triethoxysilyl) pro Rusuccinic anhydride, N- [5- (trimethoxysilyl) -2-aza-1-oxo-pentyl] caprolactam, 2- (trimethoxysilylethyl) pyridine, N- (trimethoxysilylethyl) benzyl-N, N , N-trimethylammonium chloride, phenylvinyldiethoxysilane, 3-thiocyanatopropyltriethoxysilane, (tridecafluoro-1,1,2,2, -tetrahydrooctyl) triethoxysilane, N- {3- (triethoxy Silyl) propyl} phthalamic acid, (3,3,3-trifluoropropyl) methyldimethoxysilane, (3,3,3-trifluoropropyl) trimethoxysilane, 1-trimethoxysilyl-2- (chloromethyl) ) Phenylethane, 2- (trimethoxysilyl) ethyl Nylsulfonyl azide, β-trimethoxysilylethyl-2-pyridine, trimethoxysilylpropyldiethylenetriamine, N- (3-trimethoxysilylpropyl) pyrrole, N-trimethoxysilylpropyl-N, N, N-tributylammonium bromide, N-trimethoxysilylpropyl-N, N, N-tributylammonium chloride, N-trimethoxysilylpropyl-N, N, N-trimethylammonium chloride, vinylmethyldiethoxylane, vinyltriethoxysilane, vinyltrimethoxysilane, Vinylmethyldimethoxysilane, vinyldimethylmethoxysilane, vinyldimethylethoxysilane, vinylmethyldichlorosilane, vinylphenyldichlorosilane, vinylphenyldiethoxysilane, vinylphenol Dimethylsilane, vinylphenylmethylchlorosilane, vinyltriphenoxysilane, vinyltris-t-butoxysilane, adamantylethyltrichlorosilane, allylphenyltrichlorosilane, (aminoethylaminomethyl) phenethyltrimethoxysilane, 3-aminophenoxydimethylvinylsilane, phenyl Trichlorosilane, phenyldimethylchlorosilane, phenylmethyldichlorosilane, benzyltrichlorosilane, benzyldimethylchlorosilane, benzylmethyldichlorosilane, phenethyldiisopropylchlorosilane, phenethyltrichlorosilane, phenethyldimethylchlorosilane, phenethylmethyldichlorosilane, 5- (bicycloheptenyl) tri Chlorosilane, 5- (bicycloheptenyl) triethoxy Silane, 2- (bicycloheptyl) dimethylchlorosilane, 2- (bicycloheptyl) trichlorosilane, 1,4-bis (trimethoxysilylethyl) benzene, bromophenyltrichlorosilane, 3-phenoxypropyldimethylchlorosilane, 3-phenoxypropyltri Chlorosilane, t-butylphenylchlorosilane, t-butylphenylmethoxysilane, t-butylphenyldichlorosilane, p- (t-butyl) phenethyldimethylchlorosilane, p- (t-butyl) phenethyltrichlorosilane, 1,3- (chloro Dimethylsilylmethyl) heptacosane, ((chloromethyl) phenylethyl) dimethylchlorosilane, ((chloromethyl) phenylethyl) methyldichlorosilane, ((chloromethyl) phenylethyl) trichloro Silane, ((chloromethyl) phenylethyl) trimethoxysilane, chlorophenyltrichlorosilane, 2-cyanoethyltrichlorosilane, 2-cyanoethylmethyldichlorosilane, 3-cyanopropylmethyldiethoxysilane, 3-cyanopropylmethyldichlorosilane, 3- Examples include cyanopropylmethyldichlorosilane, 3-cyanopropyldimethylethoxysilane, 3-cyanopropylmethyldichlorosilane, 3-cyanopropyltrichlorosilane, fluorinated alkylsilane, and the like. A combination of the above can be used.

Among these, hexamethyldisilazane is preferably used for the hydrophobization treatment. Thereby, the hydrophobicity of the particles can be made higher. In addition, the uniformity of the degree of the hydrophobization treatment at each particle or each part of the particle surface (including the surface inside the pores) can be made higher and more easily and reliably.
When the hydrophobization treatment using the silane compound is performed in the liquid phase, the desired reaction can be suitably advanced by immersing the particles to be hydrophobized in the liquid containing the silane compound. A chemical adsorption film of a silane compound can be formed.
In addition, when the hydrophobization treatment using the silane compound is performed in the gas phase, the desired reaction can be promoted by exposing the particles 63 to be hydrophobized to the vapor of the silane compound. A chemical adsorption film of a compound can be formed.

  The average particle size of the particles 63 constituting the three-dimensional modeling powder is not particularly limited, but is preferably 1 μm or more and 25 μm or less, and more preferably 1 μm or more and 15 μm or less. As a result, the mechanical strength of the three-dimensional structure 1 can be made particularly excellent, and the occurrence of unintentional irregularities in the manufactured three-dimensional structure 1 can be more effectively prevented. The dimensional accuracy of the shaped article 1 can be made particularly excellent. In addition, the fluidity of the powder for three-dimensional modeling, the fluidity of the composition for three-dimensional modeling including the powder for three-dimensional modeling are particularly excellent, and the productivity of the three-dimensional modeling is particularly excellent. it can. In the present invention, the average particle diameter means a volume-based average particle diameter. For example, a dispersion obtained by adding a sample to methanol and dispersing for 3 minutes with an ultrasonic disperser (Coulter counter method particle size distribution analyzer ( It can be determined by measuring with a 50 μm aperture using COULTER ELECTRONICS INS TA-II type).

  The Dmax of the particles 63 constituting the three-dimensional modeling powder is preferably 3 μm or more and 40 μm or less, and more preferably 5 μm or more and 30 μm or less. As a result, the mechanical strength of the three-dimensional structure 1 can be made particularly excellent, and the occurrence of unintentional irregularities in the manufactured three-dimensional structure 1 can be more effectively prevented. The dimensional accuracy of the shaped article 1 can be made particularly excellent. Further, the fluidity of the powder for three-dimensional modeling, the fluidity of the composition for three-dimensional modeling including the powder for three-dimensional modeling are particularly excellent, and the productivity of the three-dimensional modeling object 1 is particularly excellent. Can do. Moreover, the scattering of the light by the particle | grains 63 in the surface of the three-dimensional structure 1 manufactured can be prevented more effectively.

When the particles 63 are porous particles, the porosity of the porous particles is preferably 50% or more, and more preferably 55% or more and 90% or less. As a result, the space (pores) into which the curable resin enters can be sufficiently provided, and the mechanical strength of the porous particles themselves can be made excellent. As a result, the binding resin enters the pores. The mechanical strength of the resulting three-dimensional structure 1 can be made particularly excellent. In the present invention, the porosity of the particle means the ratio (volume ratio) of the voids existing inside the particle to the apparent volume of the particle, and the density of the particle is represented by ρ [g / cm ³ ], The true density ρ ₀ [g / cm ³ ] of the constituent material of the particle is a value represented by {(ρ ₀ −ρ) / ρ ₀ } × 100.

  When the particles 63 are porous particles, the average pore diameter (pore diameter) of the porous particles is preferably 10 nm or more, and more preferably 50 nm or more and 300 nm or less. Thereby, the mechanical strength of the finally obtained three-dimensional structure 1 can be made particularly excellent. Moreover, when using the colored ink containing a pigment for manufacture of the three-dimensional structure 1, the pigment can be suitably held in the pores of the porous particles. For this reason, unintentional diffusion of the pigment can be prevented, and a high-definition image can be more reliably formed.

The particles 63 constituting the three-dimensional modeling powder may have any shape, but preferably have a spherical shape. Thereby, the fluidity of the powder for 3D modeling, the fluidity of the composition for 3D modeling including the powder for 3D modeling, and the productivity of the 3D model 1 are particularly excellent. In addition, it is possible to more effectively prevent the occurrence of unintended irregularities in the manufactured three-dimensional structure 1 and to make the dimensional accuracy of the three-dimensional structure 1 particularly excellent.
The three-dimensional modeling powder may include a plurality of types of particles having different conditions as described above (for example, the constituent material of the particles, the type of hydrophobic treatment, etc.).

The porosity of the three-dimensional modeling powder is preferably 70% or more and 98% or less, and more preferably 75% or more and 97.7% or less. Thereby, the mechanical strength of the three-dimensional structure can be made particularly excellent. In addition, the fluidity of the powder for three-dimensional modeling, the fluidity of the composition for three-dimensional modeling including the powder for three-dimensional modeling are particularly excellent, and the productivity of the three-dimensional modeling is particularly excellent. In addition, it is possible to more effectively prevent the occurrence of unintended irregularities in the manufactured three-dimensional structure, and to make the dimensional accuracy of the three-dimensional structure particularly excellent. In the present invention, the porosity of the three-dimensional modeling powder refers to the three-dimensional modeling powder with respect to the capacity of the container when a predetermined volume (for example, 100 mL) of the container is filled with the three-dimensional modeling powder. Is the ratio of the sum of the volume of pores of all particles constituting the volume and the volume of voids existing between the particles, and the bulk density of the powder for three-dimensional modeling is Ρ [g / cm ³ ], three-dimensional When the true density of the constituent material of the modeling powder is Ρ ₀ [g / cm ³ ], the value is represented by {(Ρ ₀ −Ρ) / Ρ ₀ } × 100.
The content of the three-dimensional modeling powder in the three-dimensional modeling composition is preferably 10% by mass or more and 90% by mass or less, and more preferably 15% by mass or more and 58% by mass or less. Thereby, the mechanical strength of the finally obtained three-dimensional structure 1 can be made particularly excellent while the fluidity of the composition for three-dimensional structure is sufficiently excellent.

≪Water-soluble resin≫
The three-dimensional modeling composition includes a water-soluble resin 64 together with a plurality of particles 63. By including the water-soluble resin 64, the particles 63 can be bonded (temporarily fixed) to each other (see FIG. 3), and unintentional scattering of the particles 63 can be effectively prevented. Thereby, an operator's safety and the improvement of the dimensional accuracy of the three-dimensional structure 1 manufactured can be aimed at.

In the present invention, the water-soluble resin may be any resin that is at least partially soluble in water. For example, the solubility in water at 25 ° C. (mass soluble in 100 g of water) is 5 [g / 100 g. Water] or more is preferable, and more than 10 [g / 100 g water] is more preferable.
Examples of the water-soluble resin 64 include polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), sodium polyacrylate, polyacrylamide, modified polyamide, polyethyleneimine, polyethylene oxide, and other synthetic polymers, corn starch, mannan, pectin, agar, Examples include natural polymers such as alginic acid, dextran, glue and gelatin, semi-synthetic polymers such as carboxymethylcellulose, hydroxyethylcellulose, oxidized starch, and modified starch. One or more selected from these may be used in combination. it can.

  Examples of water-soluble resin products include, for example, methyl cellulose (manufactured by Shin-Etsu Chemical Co., Ltd .: trade name “Metros SM-15”), hydroxyethyl cellulose (manufactured by Fuji Chemical Co., Ltd .: trade name “AL-15”), hydroxypropyl cellulose (Japan) Soda: trade name “HPC-M”), carboxymethyl cellulose (manufactured by Nichirin Chemical Co., Ltd .: trade name “CMC-30”), starch phosphate sodium sodium (I) (manufactured by Matsutani Chemical Co., Ltd .: trade name “Hoster 5100”) ), Polyvinylpyrrolidone (manufactured by Tokyo Chemical Co., Ltd .: trade name “PVP K-90”), methyl vinyl ether / maleic anhydride copolymer (manufactured by GAF Gauntlet Co., Ltd .: trade name “AN-139”), polyacrylamide (Wako Pure Chemical Industries, Ltd.) Manufactured), modified polyamide (modified nylon) (manufactured by Toray Industries, Inc .: trade name “AQ nylon”), Reethylene oxide (trade name “PEO-1” manufactured by Steel Chemical Co., Ltd., trade name “Alcox” manufactured by Meisei Chemical Industry Co., Ltd.), ethylene oxide / propylene oxide random copolymer (made by Meisei Chemical Industry Co., Ltd .: trade name “Al”) Cox EP "), sodium polyacrylate (Wako Pure Chemical Industries), carboxyvinyl polymer / crosslinked acrylic water-soluble resin (manufactured by Sumitomo Seika Co., Ltd .: trade name" Apeck "), and the like.

  Especially, when the water-soluble resin 64 is polyvinyl alcohol, the mechanical strength of the three-dimensional structure 1 can be made particularly excellent. Further, by adjusting the degree of saponification and the degree of polymerization, characteristics of the water-soluble resin 64 (for example, water solubility, water resistance, etc.) and characteristics of the three-dimensional modeling composition (for example, viscosity, fixing force of the particles 63, wettability) Etc.) can be controlled more suitably. For this reason, it can respond suitably by manufacture of the various three-dimensional structure 1. Polyvinyl alcohol is inexpensive and stable in supply among various water-soluble resins. For this reason, it is possible to manufacture the stable three-dimensional structure 1 while suppressing the production cost.

When the water-soluble resin 64 contains polyvinyl alcohol, the saponification degree of the polyvinyl alcohol is preferably 85 or more and 90 or less. Thereby, the fall of the solubility of the polyvinyl alcohol with respect to water can be suppressed. Therefore, when the three-dimensional structure forming composition contains water, it is possible to more effectively suppress a decrease in adhesiveness between the adjacent unit layers 7.
When the water-soluble resin 64 contains polyvinyl alcohol, the degree of polymerization of the polyvinyl alcohol is preferably 300 or more and 1000 or less. Thereby, when the composition for three-dimensional modeling contains water, the mechanical strength of each unit layer 7 and the adhesiveness between adjacent unit layers 7 can be made particularly excellent.

  Further, when the water-soluble resin 64 is polyvinyl pyrrolidone (PVP), the following effects are obtained. That is, since polyvinylpyrrolidone has excellent adhesion to various materials such as glass, metal, and plastic, the strength and shape stability of the layer 6 to which no ink is applied are particularly excellent. The dimensional accuracy of the obtained three-dimensional structure 1 can be made particularly excellent. In addition, since polyvinylpyrrolidone exhibits high solubility in various organic solvents, the flowability of the three-dimensional modeling composition is particularly excellent when the three-dimensional modeling composition includes an organic solvent. It is possible to suitably form the layer 6 in which the unintentional thickness variation is more effectively prevented, and the dimensional accuracy of the finally obtained three-dimensional structure 1 is particularly excellent. be able to. Moreover, since polyvinylpyrrolidone shows high solubility also to water, in the unbonded particle removal step (after completion of modeling), among the particles 63 constituting each layer 6, those that are not bound by the binder 44. It can be easily and reliably removed. Polyvinylpyrrolidone has a moderate affinity with the powder for three-dimensional modeling, so that it does not easily enter the pores 611 as described above. The wettability is relatively high. For this reason, the temporary fixing function as described above can be more effectively exhibited. Moreover, since polyvinyl pyrrolidone is excellent in affinity with various colorants, when the ink 4 containing the colorant is used in the ink application step, the colorant is effectively diffused unintentionally. Can be prevented. In addition, since polyvinylpyrrolidone has an antistatic function, it is possible to effectively prevent the powder from being scattered when a non-paste powder is used as the three-dimensional modeling composition in the layer forming step. Moreover, when using what was paste-formed as a three-dimensional modeling composition in a layer formation process, if the paste-like three-dimensional modeling composition contains polyvinylpyrrolidone, bubbles are present in the three-dimensional modeling composition. Involvement can be effectively prevented, and defects due to entrainment of bubbles can be effectively prevented in the layer formation step.

When the water-soluble resin 64 contains polyvinyl pyrrolidone, the weight average molecular weight of the polyvinyl pyrrolidone is preferably 10000 or more and 1700000 or less, and more preferably 30000 or more and 1500,000 or less. Thereby, the function mentioned above can be exhibited more effectively.
In the three-dimensional modeling composition, the water-soluble resin 64 is preferably in a liquid state (for example, a dissolved state, a molten state, etc.) at least in the layer forming step. Thereby, the uniformity of the thickness of the layer 6 formed using the composition for three-dimensional modeling can be made higher easily and reliably.

  The content of the water-soluble resin 64 in the three-dimensional modeling composition is preferably 15% by volume or less, and preferably 2% by volume or more and 5% by volume or less with respect to the bulk volume of the three-dimensional modeling powder. Is more preferable. As a result, it is possible to ensure a wider space for the ink 4 to enter while sufficiently exerting the function of the water-soluble resin 64 as described above, and to have a particularly excellent mechanical strength of the three-dimensional structure 1. can do.

≪Solvent≫
The three-dimensional modeling composition may contain a solvent in addition to the water-soluble resin 64 and the three-dimensional modeling powder as described above. Thereby, the fluidity | liquidity of the composition for three-dimensional modeling can be made especially excellent, and the productivity of the three-dimensional modeling thing 1 can be made especially excellent.
The solvent is preferably one that dissolves the water-soluble resin 64. Thereby, the fluidity | liquidity of the composition for three-dimensional modeling can be made favorable, and the unintentional dispersion | variation in the thickness of the layer 6 formed using the composition for three-dimensional modeling is prevented more effectively. can do. Further, when the layer 6 in a state where the solvent is removed is formed, the water-soluble resin 64 can be adhered to the particles 63 with higher uniformity over the entire layer 6, and unintentional composition unevenness occurs. Can be more effectively prevented. For this reason, generation | occurrence | production of the unintentional dispersion | variation in the mechanical strength in each site | part of the three-dimensional structure 1 finally obtained can be prevented more effectively, and the reliability of the three-dimensional structure 1 is higher. Can be.

  Examples of the solvent constituting the three-dimensional modeling composition include water; alcoholic solvents such as methanol, ethanol, and isopropanol; ketone solvents such as methyl ethyl ketone and acetone; glycols such as ethylene glycol monoethyl ether and ethylene glycol monobutyl ether. Glycol ether acetates such as ether, propylene glycol 1-monomethyl ether 2-acetate, propylene glycol 1-monoethyl ether 2-acetate; polyethylene glycol, polypropylene glycol and the like, and one or two selected from these A combination of the above can be used.

  Especially, it is preferable that the composition for three-dimensional modeling contains water. Thereby, the water-soluble resin 64 can be dissolved more reliably, and the fluidity of the three-dimensional modeling composition and the uniformity of the composition of the layer 6 formed using the three-dimensional modeling composition are particularly excellent. Can be. In addition, water is easy to remove after the formation of the layer 6, and even when remaining in the three-dimensional structure 1, it is difficult to adversely affect water. Moreover, it is advantageous from the viewpoint of safety to the human body and environmental problems.

When the three-dimensional modeling composition contains a solvent, the content of the solvent in the three-dimensional modeling composition is preferably 5% by mass or more and 75% by mass or less, and 35% by mass or more and 70% by mass or less. More preferably. Thereby, while the effect by including a solvent as mentioned above is exhibited more notably, since the solvent can be easily removed in a short time in the manufacturing process of the three-dimensional structure 1, the three-dimensional structure 1 This is advantageous from the viewpoint of improving productivity.
In particular, when the three-dimensional modeling composition contains water as a solvent, the water content in the three-dimensional modeling composition is preferably 20% by mass to 73% by mass, and more preferably 50% by mass to 70%. It is more preferable that the amount is not more than mass%. Thereby, the effects as described above are more remarkably exhibited.

≪Other ingredients≫
Further, the three-dimensional modeling composition may include components other than those described above. Examples of such components include a polymerization initiator; a polymerization accelerator; a penetration accelerator; a wetting agent (humectant); a fixing agent; an antifungal agent; an antiseptic; an antioxidant; an ultraviolet absorber; Examples include regulators.

4). Ink Next, the ink used in the method for producing a three-dimensional structure of the present invention will be described in detail.
<< Binder >>
The ink 4 includes at least a binder 44.
The binder 44 is a component having a function of binding the particles 63 by curing.

  Such a binder 44 is not particularly limited, but a binder having hydrophobicity (lipophilicity) is preferably used. Thereby, for example, when the particles 63 that have been subjected to a hydrophobic treatment are used, the affinity between the ink 4 and the particles 63 can be increased, and the ink 4 is applied to the layer 6. As a result, the ink 4 can suitably enter the pores 611 of the particles 63. As a result, the anchor effect by the binder 44 is suitably exhibited, and the mechanical strength of the finally obtained three-dimensional structure 1 can be made excellent. In the present invention, the hydrophobic curable resin may be any resin having a sufficiently low affinity for water. For example, the solubility in water at 25 ° C. is 1 [g / 100 g water] or less. preferable.

  Examples of the binder 44 include thermoplastic resins; thermosetting resins; visible light curable resins (narrowly defined photocurable resins) that are cured by light in the visible light region, ultraviolet curable resins, and infrared curable resins. Various photo-curable resins; X-ray curable resins and the like can be mentioned, and one or two or more selected from these can be used in combination. Among these, from the viewpoint of the mechanical strength of the obtained three-dimensional structure 1 and the productivity of the three-dimensional structure 1, the binder 44 is preferably a curable resin. Among various curable resins, in particular, from the viewpoint of the mechanical strength of the obtained three-dimensional structure 1, the productivity of the three-dimensional structure 1, the storage stability of the ink 4, and the like, in particular, an ultraviolet curable resin (polymerizable) Compound) is preferred.

As the ultraviolet curable resin (polymerizable compound), a resin in which addition polymerization or ring-opening polymerization is initiated by irradiation with ultraviolet rays by radical species or cationic species generated from a photopolymerization initiator, and a polymer is preferably used. . Examples of the polymerization mode of addition polymerization include radical, cation, anion, metathesis, and coordination polymerization. Examples of the ring-opening polymerization method include cation, anion, radical, metathesis, and coordination polymerization.
Examples of the addition polymerizable compound include compounds having at least one ethylenically unsaturated double bond. As the addition polymerizable compound, a compound having at least one, preferably two or more terminal ethylenically unsaturated bonds can be preferably used.

  The ethylenically unsaturated polymerizable compound has a chemical form of a monofunctional polymerizable compound and a polyfunctional polymerizable compound, or a mixture thereof. Examples of the monofunctional polymerizable compound include unsaturated carboxylic acids (for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.), esters thereof, amides, and the like. As the polyfunctional polymerizable compound, an ester of an unsaturated carboxylic acid and an aliphatic polyhydric alcohol compound, or an amide of an unsaturated carboxylic acid and an aliphatic polyvalent amine compound is used.

  In addition, unsaturated carboxylic acid esters or amides having nucleophilic substituents such as hydroxyl group, amino group, mercapto group and the like, addition products of isocyanates and epoxies, dehydration condensation products of carboxylic acids, etc. Can be used. In addition, addition reaction products of unsaturated carboxylic acid esters or amides having an electrophilic substituent such as an isocyanate group or an epoxy group with alcohols, amines and thiols, as well as removal of halogen groups, tosyloxy groups, etc. A substitution reaction product of an unsaturated carboxylic acid ester or amide having a releasing substituent and an alcohol, amine or thiol can also be used.

Specific examples of the radical polymerizable compound that is an ester of an unsaturated carboxylic acid and an aliphatic polyhydric alcohol compound include, for example, (meth) acrylic acid ester, which is either monofunctional or polyfunctional. Can also be used.
Specific examples of the monofunctional (meth) acrylate include, for example, tolyloxyethyl (meth) acrylate, phenyloxyethyl (meth) acrylate, cyclohexyl (meth) acrylate, ethyl (meth) acrylate, methyl (meth) acrylate, isobornyl (Meth) acrylate, tetrahydrofurfuryl (meth) acrylate, etc. are mentioned.

  Specific examples of the bifunctional (meth) acrylate include, for example, ethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, 1,3-butanediol di (meth) acrylate, tetramethylene glycol di (meth) ) Acrylate, propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, hexanediol di (meth) acrylate, 1,4-cyclohexanediol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, penta Examples include erythritol di (meth) acrylate and dipentaerythritol di (meth) acrylate.

  Specific examples of the trifunctional (meth) acrylate include, for example, trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, trimethylolpropane alkylene oxide-modified tri (meth) acrylate, pentaerythritol tri ( (Meth) acrylate, dipentaerythritol tri (meth) acrylate, trimethylolpropane tri ((meth) acryloyloxypropyl) ether, isocyanuric acid alkylene oxide modified tri (meth) acrylate, dipentaerythritol tri (meth) acrylate propionate, tri ((Meth) acryloyloxyethyl) isocyanurate, hydroxypivalaldehyde-modified dimethylolpropane tri (meth) acrylate, sorbitol tri ( Data) acrylate, and the like.

Specific examples of the tetrafunctional (meth) acrylate include, for example, pentaerythritol tetra (meth) acrylate, sorbitol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol tetra (meth) acrylate propionate, Examples include ethoxylated pentaerythritol tetra (meth) acrylate.
Specific examples of the pentafunctional (meth) acrylate include sorbitol penta (meth) acrylate and dipentaerythritol penta (meth) acrylate.

Specific examples of the hexafunctional (meth) acrylate include, for example, dipentaerythritol hexa (meth) acrylate, sorbitol hexa (meth) acrylate, phosphazene alkylene oxide modified hexa (meth) acrylate, captolactone modified dipentaerythritol hexa ( And (meth) acrylate.
Examples of the polymerizable compound other than (meth) acrylate include itaconic acid ester, crotonic acid ester, isocrotonic acid ester, maleic acid ester and the like.

Examples of itaconic acid esters include ethylene glycol diitaconate, propylene glycol diitaconate, 1,3-butanediol diitaconate, 1,4-butanediol diitaconate, tetramethylene glycol diitaconate, and pentaerythritol diesterate. Examples include itaconate and sorbitol tetritaconate.
Examples of crotonic acid esters include ethylene glycol dicrotonate, tetramethylene glycol dicrotonate, pentaerythritol dicrotonate, and sorbitol tetradicrotonate.

Examples of the isocrotonic acid ester include ethylene glycol diisocrotonate, pentaerythritol diisocrotonate, and sorbitol tetraisocrotonate.
Examples of maleic acid esters include ethylene glycol dimaleate, triethylene glycol dimaleate, pentaerythritol dimaleate, and sorbitol tetramaleate.

  Examples of other esters include aliphatic alcohol esters described in JP-B-46-27926, JP-B-51-47334, JP-A-57-196231, and JP-A-59- Those having an aromatic skeleton described in Japanese Patent No. 5240, Japanese Patent Application Laid-Open No. 59-5241, Japanese Patent Application Laid-Open No. 2-226149, and those containing an amino group described in Japanese Patent Application Laid-Open No. 1-165613 are also used. be able to.

Specific examples of the amide monomer of unsaturated carboxylic acid and aliphatic polyvalent amine compound include, for example, methylene bis-acrylamide, methylene bis-methacrylamide, 1,6-hexamethylene bis-acrylamide, 1,6-hexa. Examples include methylene bis-methacrylamide, diethylenetriamine trisacrylamide, xylylene bisacrylamide, and xylylene bismethacrylamide.
Examples of other preferable amide monomers include those having a cyclohexylene structure described in JP-B No. 54-21726.

In addition, a urethane-based addition polymerizable compound produced by using an addition reaction between an isocyanate and a hydroxyl group is also suitable. As such a specific example, for example, one molecule described in JP-B-48-41708 A vinyl urethane compound containing two or more polymerizable vinyl groups in one molecule obtained by adding a vinyl monomer containing a hydroxyl group represented by the following formula (1) to a polyisocyanate compound having two or more isocyanate groups. Etc.
^{_{CH 2 = C (R 1)}} COOCH 2 CH (R 2) OH (1)
(However, in formula (1), R ¹ and R ² each independently represent H or CH ^3. )

In the present invention, a cationic ring-opening polymerizable compound having at least one cyclic ether group such as an epoxy group or an oxetane group in the molecule can be suitably used as the ultraviolet curable resin (polymerizable compound).
Examples of the cationic polymerizable compound include a curable compound containing a ring-opening polymerizable group, and among them, a heterocyclic group-containing curable compound is particularly preferable. Such curable compounds include, for example, epoxy derivatives, oxetane derivatives, tetrahydrofuran derivatives, cyclic lactone derivatives, cyclic carbonate derivatives, cyclic imino ethers such as oxazoline derivatives, vinyl ethers, etc. Among them, epoxy derivatives, oxetanes, etc. Derivatives and vinyl ethers are preferred.

Examples of preferred epoxy derivatives include monofunctional glycidyl ethers, polyfunctional glycidyl ethers, monofunctional alicyclic epoxies, polyfunctional alicyclic epoxies, and the like.
Specific examples of glycidyl ethers include, for example, diglycidyl ethers (for example, ethylene glycol diglycidyl ether, bisphenol A diglycidyl ether, etc.), trifunctional or higher glycidyl ethers (for example, trimethylolethane triglycidyl). Ether, trimethylolpropane triglycidyl ether, glycerol triglycidyl ether, triglycidyl trishydroxyethyl isocyanurate, etc.), tetra- or higher functional glycidyl ethers (for example, sorbitol tetraglycidyl ether, pentaerythritol tetraglycyl ether, poly of cresol novolac resin) Glycidyl ether, polyglycidyl ether of phenol novolac resin, etc.), alicyclic epoxies (eg, Celoxide 2) 21P, Celoxide 2081, Epolide GT-301, Epolide GT-401 (manufactured by Daicel Chemical Industries, Ltd.), EHPE (manufactured by Daicel Chemical Industries, Ltd.), polycyclohexyl epoxy methyl ether of phenol novolac resin, etc. Oxetanes (for example, OX-SQ, PNOX-1009 (above, manufactured by Toagosei Co., Ltd.)) and the like.

As the polymerizable compound, an alicyclic epoxy derivative can be preferably used. The “alicyclic epoxy group” refers to a partial structure obtained by epoxidizing a double bond of a cycloalkene ring such as a cyclopentene group or a cyclohexene group with an appropriate oxidizing agent such as hydrogen peroxide or peracid.
The alicyclic epoxy compound is preferably a polyfunctional alicyclic epoxy having two or more cyclohexene oxide groups or cyclopentene oxide groups in one molecule. Specific examples of the alicyclic epoxy compound include, for example, 4-vinylcyclohexylene dioxide, (3,4-epoxycyclohexyl) methyl-3,4-epoxycyclohexylcarboxylate, di (3,4-epoxycyclohexyl) adipate, Examples include di (3,4-epoxycyclohexylmethyl) adipate, bis (2,3-epoxycyclopentyl) ether, di (2,3-epoxy-6-methylcyclohexylmethyl) adipate, and dicyclopentadiene dioxide.

The glycidyl compound which has a normal epoxy group which does not have an alicyclic structure in a molecule | numerator can be used independently, or can also be used together with the said alicyclic epoxy compound.
Examples of such normal glycidyl compounds include glycidyl ether compounds and glycidyl ester compounds, but it is preferable to use glycidyl ether compounds in combination.

  Specific examples of the glycidyl ether compound include 1,3-bis (2,3-epoxypropyloxy) benzene, bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin, cresol novolac. Glycidyl ether compounds such as epoxy resin, trisphenol methane epoxy resin, aliphatic glycidyl ethers such as 1,4-butanediol glycidyl ether, glycerol triglycidyl ether, propylene glycol diglycidyl ether, trimethylolpropane tritriglycidyl ether Compounds and the like. Examples of the glycidyl ester include a glycidyl ester of linolenic acid dimer.

As the polymerizable compound, a compound having an oxetanyl group which is a 4-membered cyclic ether (hereinafter, also simply referred to as “oxetane compound”) can be used. An oxetanyl group-containing compound is a compound having one or more oxetanyl groups in one molecule.
The content of the binder 44 in the ink 4 is preferably 80% by mass or more, and more preferably 85% by mass or more. Thereby, the mechanical strength of the finally obtained three-dimensional structure 1 can be made particularly excellent.

≪Other ingredients≫
Moreover, the ink 4 may contain components other than those described above. Examples of such components include various colorants such as pigments and dyes; dispersants; surfactants; polymerization initiators; polymerization accelerators; solvents; penetration enhancers; wetting agents (humectants); Examples include glazes; antiseptics; antioxidants; ultraviolet absorbers; chelating agents; pH adjusters; thickeners; fillers;

In particular, when the ink 4 includes a colorant, the three-dimensional structure 1 colored in a color corresponding to the color of the colorant can be obtained.
In particular, by including a pigment as a colorant, the light resistance of the ink 4 and the three-dimensional structure 1 can be improved. As the pigment, either an inorganic pigment or an organic pigment can be used.

Examples of the inorganic pigment include carbon blacks (CI pigment black 7) such as furnace black, lamp black, acetylene black, channel black, iron oxide, titanium oxide, and the like, and one kind selected from these. Alternatively, two or more kinds can be used in combination.
Among the inorganic pigments, titanium oxide is preferable in order to exhibit a preferable white color.

  Examples of the organic pigment include insoluble azo pigments, condensed azo pigments, azo lakes and chelate azo pigments, phthalocyanine pigments, perylene and perinone pigments, anthraquinone pigments, quinacridone pigments, dioxane pigments, thioindigo pigments, isoindolinone pigments, and quinophthalone. Polycyclic pigments such as pigments, dye chelates (for example, basic dye type chelates, acidic dye type chelates), dyeing lakes (basic dye type lakes, acid dye type lakes), nitro pigments, nitroso pigments, aniline black, Daylight fluorescent pigments and the like can be mentioned, and one or more selected from these can be used in combination.

  More specifically, as carbon black used as a black (black) pigment, for example, No. 2300, no. 900, MCF88, No. 33, no. 40, no. 45, no. 52, MA7, MA8, MA100, no. 2200B and the like (manufactured by Mitsubishi Chemical Corporation), Raven 5750, Raven 5250, Raven 5000, Raven 3500, Raven 1255, Raven 700, etc. (and above, manufactured by Columbia Columbia), Regal 400R, Rega1 330R, Rega1 660R, Mogul L, Monarch 700, Monarch 800, Monarch 880, Monarch 900, Monarch 1000, Monarch 1100, Monarch 1300, Monarch 1400, etc. (above, manufactured by CABOT JAPAN K. C. Black FW1, Color Black FW2, Color Black FW2V, Color Black FW18, Color Black FW200, Color B1ack S150, Color Black S160, Color Black S170, Printex 35, Printex U, Printex V, Printex 140U, Special Black 6S Degussa)).

Examples of white pigments include C.I. I. Pigment white 6, 18, 21 and the like.
Examples of yellow (yellow) pigments include C.I. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 16, 17, 24, 34, 35, 37, 53, 55, 65, 73, 74, 75, 81, 83, 93, 94, 95, 97, 98, 99, 108, 109, 110, 113, 114, 117, 120, 124, 128, 129, 133, 138, 139, 147, 151, 153, 154, 167, 172, 180 and the like.

  Examples of magenta pigments include C.I. I. Pigment Red 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 21, 22, 23, 30, 31, 32, 37, 38, 40, 41, 42, 48 (Ca), 48 (Mn), 57 (Ca), 57: 1, 88, 112, 114, 122, 123, 144, 146, 149, 150, 166, 168 170, 171, 175, 176, 177, 178, 179, 184, 185, 187, 202, 209, 219, 224, 245, or C.I. I. Pigment violet 19, 23, 32, 33, 36, 38, 43, 50 and the like.

Examples of the violet (cyan) pigment include C.I. I. Pigment Blue 1, 2, 3, 15, 15: 1, 15: 2, 15: 3, 15:34, 15: 4, 16, 18, 22, 25, 60, 65, 66, C.I. I. Bat Blue 4, 60 and the like.
Examples of other pigments include C.I. I. Pigment green 7,10, C.I. I. Pigment brown 3, 5, 25, 26, C.I. I. Pigment orange 1, 2, 5, 7, 13, 14, 15, 16, 24, 34, 36, 38, 40, 43, 63, and the like.

When the ink 4 contains a pigment, the average particle size of the pigment is preferably 300 nm or less, and more preferably 50 nm or more and 250 nm or less. Thereby, the ejection stability of the ink 4 and the dispersion stability of the pigment in the ink 4 can be made particularly excellent, and an image with better image quality can be formed.
In the case where the ink 4 includes a pigment and the particle 63 is porous, the relationship of d1 / d2> 1 is established when the average pore diameter of the particle 63 is d1 [nm] and the average particle diameter of the pigment is d2 [nm]. It is preferable that the relationship is satisfied, and it is more preferable that the relationship 1.1 ≦ d1 / d2 ≦ 6 is satisfied. By satisfying such a relationship, the pigment can be suitably held in the pores of the particles 63. For this reason, unintentional diffusion of the pigment can be prevented, and a high-definition image can be more reliably formed.

Examples of the dye include acid dyes, direct dyes, reactive dyes, basic dyes, and the like, and one or more selected from these can be used in combination.
Specific examples of the dye include C.I. I. Acid Yellow 17, 23, 42, 44, 79, 142, C.I. I. Acid Red 52, 80, 82, 249, 254, 289, C.I. I. Acid Blue 9, 45, 249, C.I. I. Acid Black 1, 2, 24, 94, C.I. I. Food Black 1, 2, C.I. I. Direct Yellow 1,12,24,33,50,55,58,86,132,142,144,173, C.I. I. Direct Red 1,4,9,80,81,225,227, C.I. I. Direct Blue 1, 2, 15, 71, 86, 87, 98, 165, 199, 202, C.I. I. Directed Black 19, 38, 51, 71, 154, 168, 171, 195, C.I. I. Reactive Red 14, 32, 55, 79, 249, C.I. I. Reactive black 3, 4, 35 etc. are mentioned.

When the ink 4 contains a colorant, the content of the colorant in the ink 4 is preferably 1% by mass or more and 20% by mass or less. Thereby, particularly excellent concealability and color reproducibility can be obtained.
In particular, when the ink 4 contains titanium oxide as a colorant, the content of titanium oxide in the ink 4 is preferably 12% by mass or more and 18% by mass or less, and more preferably 14% by mass or more and 16% by mass or less. More preferably. Thereby, a particularly excellent concealing property can be obtained.
When the ink 4 includes a pigment, the dispersibility of the pigment can be further improved when the ink 4 further includes a dispersant. As a result, a partial decrease in mechanical strength due to pigment bias can be more effectively suppressed.

  Although it does not specifically limit as a dispersing agent, For example, the dispersing agent currently used in preparing pigment dispersion liquids, such as a polymer dispersing agent, is mentioned. Specific examples of the polymer dispersant include, for example, polyoxyalkylene polyalkylene polyamine, vinyl polymer and copolymer, acrylic polymer and copolymer, polyester, polyamide, polyimide, polyurethane, amino polymer, silicon-containing polymer, and sulfur-containing polymer. , Fluorine-containing polymers, and epoxy resins having one or more types as main components. Commercially available polymer dispersants include, for example, Ajinomoto Fine Techno Co., Ltd. Ajisper series, Solsperse series (Solsperse 36000, etc.) available from Noveon, BYK Co., Ltd. Dispersic series, Enomoto Kasei The company's Disparon series, etc. are listed.

When the ink 4 contains a surfactant, the three-dimensional structure 1 can have better abrasion resistance. The surfactant is not particularly limited. For example, polyester-modified silicone or polyether-modified silicone as a silicone-based surfactant can be used, and among them, polyether-modified polydimethylsiloxane or polyester-modified polydimethylsiloxane. Is preferably used. Specific examples of the surfactant include, for example, BYK-347, BYK-348, BYK-UV3500, 3510, 3530, 3570 (above, trade names manufactured by BYK).
The ink 4 may contain a solvent. Thereby, the viscosity adjustment of the ink 4 can be suitably performed, and even when the ink 4 includes a high-viscosity component, the ejection stability of the ink 4 by the ink jet method can be made particularly excellent.

  Examples of the solvent include (poly) alkylene glycol monoalkyl ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, and propylene glycol monoethyl ether; ethyl acetate, n-propyl acetate, iso-acetate Acetates such as propyl, n-butyl acetate and iso-butyl acetate; aromatic hydrocarbons such as benzene, toluene and xylene; methyl ethyl ketone, acetone, methyl isobutyl ketone, ethyl n-butyl ketone, diisopropyl ketone, acetylacetone, etc. Ketones: Examples include alcohols such as ethanol, propanol, and butanol, and one or more selected from these can be used in combination.

  Further, the viscosity of the ink 4 is preferably 10 mPa · s or more and 25 mPa · s or less, and more preferably 15 mPa · s or more and 20 mPa · s or less. Thereby, the discharge stability of the ink by the inkjet method can be made particularly excellent. In addition, in this specification, a viscosity means the value measured in 25 degreeC using an E-type viscosity meter (Tokyo Keiki Co., Ltd. VISCONIC ELD).

When a plurality of types of inks 4 are used, it is preferable to use at least indigo purple (cyan) ink 4, reddish purple (magenta) ink 4, and yellow (yellow) ink 4. Thereby, the color reproduction region that can be expressed can be made wider by the combination of these inks 4.
Further, by using the white ink 4 and the other colored ink 4 in combination, for example, the following effects can be obtained. That is, the finally obtained three-dimensional structure 1 is overlapped with the first region to which the white (white) ink 4 is applied and the first region, and on the outer surface side of the first region. And a region to which colored ink 4 other than white is provided. Thereby, the 1st area | region to which the white (white) ink 4 was provided can exhibit concealment property, and the chroma of the three-dimensional structure 1 can be improved more.

  Further, by using the white ink 4, the black ink 4, and the other colored ink 4 in combination, for example, the following effects can be obtained. That is, the combined use of the white ink 4 makes it possible to express lighter and lighter colors than those that can be expressed by the other colored inks 4, and the combined use of the black ink 4 allows other colored inks to be expressed. By making it possible to express colors that are lighter and lower in brightness than those that can be expressed by 4, it is possible to increase the saturation of the three-dimensional structure 1 and to expand the range of brightness expression.

As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to these.
For example, in the above-described embodiment, the curing process is described as being repeatedly performed together with the layer forming process and the ink applying process in addition to the layer forming process and the ink applying process, but the curing process is not performed repeatedly. Also good. For example, it may be performed collectively after forming a laminate including a plurality of uncured layers. Further, when the curable resin is not a curable component, the curing step can be omitted.

Moreover, in the manufacturing method of this invention, you may perform a pre-processing process, an intermediate processing process, and a post-processing process as needed.
As a pre-processing process, the cleaning process of a modeling stage etc. are mentioned, for example.
Examples of the post-processing step include a cleaning step, a shape adjustment step for performing deburring, a coloring step, a coating layer forming step, and a light irradiation treatment or a heat treatment for reliably curing an uncured curable resin. For example, a step of completing the curing of the functional resin.

In the above-described embodiment, the ink is applied to all layers. However, a layer to which no ink is applied may be provided. For example, ink may not be applied to a layer formed immediately above the modeling stage, and the layer may function as a sacrificial layer.
In the above-described embodiment, the case where the ink application process is performed by the ink jet method has been mainly described. However, the ink application process may be performed using other methods (for example, other printing methods). .
In addition, the present invention

  DESCRIPTION OF SYMBOLS 1 ... Three-dimensional structure 4 ... Ink 6 ... Layer 611 ... Hole 7 ... Unit layer 20 ... Computer 21 ... Control part 22 ... CPU 23 ... Memory | storage part 231 ... Control program 232 ... Data expansion part 24 ... Reception part 25 ... Image Generation unit 28 ... Input / output interface 29 ... Data bus 30 ... Modeling unit 40 ... Ink ejection unit 41 ... Droplet ejection head 42 ... X direction moving unit 43 ... Y direction moving unit 44 ... Binder 50 ... Powder supply unit 60 ... Powder Control unit 61 ... Blade 62 ... Guide rail 63 ... Particle 64 ... Water-soluble resin 70 ... Light source 80 ... Modeling stage 100 ... Three-dimensional model manufacturing apparatus

Claims (10)

A method for producing a three-dimensional structure in which unit layers are laminated,
A layer forming step of forming a layer having a predetermined thickness A [μm] using a three-dimensional modeling composition including a three-dimensional modeling powder composed of a plurality of particles;
An ink ejection step of ejecting ink containing a binder to form the unit layer with respect to the layer;
In the ink discharge step, two or more different inks are discharged to a discharge unit area narrower than A ² [μm ² ] on the surface of the layer on which the ink is discharged. Manufacturing method.   The method for manufacturing a three-dimensional structure according to claim 1, wherein a plurality of the discharge unit regions are arranged from the outer edge of the unit layer toward the inside.   The method for manufacturing a three-dimensional structure according to claim 1 or 2, wherein the thickness A of the layer is 30 µm or more and 500 µm or less. 4. The method for producing a three-dimensional structure according to claim 1, wherein A ² [μm ² ] is smaller than twice the landing area of the ink.   5. The ink according to claim 1, wherein the ink is one of a colored ink containing any one of cyan, magenta, yellow, black, and white, and a non-colored ink containing no colorant. Manufacturing method of three-dimensional structure.   A three-dimensional structure manufactured by the method for manufacturing a three-dimensional structure according to any one of claims 1 to 5. A three-dimensional structure in which unit layers are stacked,
A layer forming step of forming a layer having a predetermined thickness A [μm] using a composition for three-dimensional modeling including a powder for three-dimensional modeling composed of a plurality of particles, and bonding to the layer And an ink discharge step of discharging the ink containing the agent to form the unit layer.
In the ink discharge step, two or more different inks are discharged in a discharge unit area narrower than A ² [μm ² ] on the surface of the layer on which the ink is discharged. Modeled object. A three-dimensional structure manufacturing apparatus for manufacturing a three-dimensional structure in which unit layers are laminated,
A layer forming means for forming a layer having a predetermined thickness A [μm] using a three-dimensional modeling composition including a three-dimensional modeling powder composed of a plurality of particles;
An ink ejecting means for ejecting ink containing a binder to form the unit layer with respect to the layer;
The ink discharge means is configured to discharge two or more different types of ink in a discharge unit region narrower than A ² [μm ² ] on the surface of the layer on which the ink is discharged. 3D model manufacturing equipment. A control method of a three-dimensional structure manufacturing apparatus for manufacturing a three-dimensional structure in which unit layers are laminated,
The three-dimensional structure manufacturing apparatus uses a three-dimensional structure forming composition including a three-dimensional structure forming powder composed of a plurality of particles to form a layer having a predetermined thickness A [μm]. When,
An ink ejecting means for ejecting ink containing a binder to form the unit layer with respect to the layer;
The ink discharge means is configured to discharge two or more different types of ink in a discharge unit area narrower than A ² [μm ² ] on the surface of the layer on which the ink is discharged. To control the three-dimensional structure manufacturing apparatus. A control program for a three-dimensional structure manufacturing apparatus for manufacturing a three-dimensional structure in which unit layers are laminated,
The three-dimensional structure manufacturing apparatus uses a three-dimensional structure forming composition including a three-dimensional structure forming powder composed of a plurality of particles to form a layer having a predetermined thickness A [μm]. When,
An ink ejecting means for ejecting ink containing a binder to form the unit layer with respect to the layer;
The ink discharge means is configured to discharge two or more different types of ink in a discharge unit area narrower than A ² [μm ² ] on the surface of the layer on which the ink is discharged. Control program for a three-dimensional structure manufacturing apparatus.

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