JP7335600B2 - POWDER MATERIAL FOR THREE-DIMENSIONAL PRODUCTION, THREE-DIMENSIONAL PRODUCT AND METHOD FOR MANUFACTURING THREE-DIMENSIONAL PRODUCT - Google Patents

Description

TECHNICAL FIELD The present invention relates to a powder material for three-dimensional modeling, a three-dimensional model, and a method for producing a three-dimensional model.

Manufacture of a three-dimensional model by a 3D printer is attracting attention. According to the 3D printer, it is possible to manufacture a three-dimensional model without using a mold, and to manufacture a three-dimensional model having a complicated shape that is difficult to manufacture with a mold. There are various types of 3D printers. Examples of methods include the material extrusion deposition method (FDM), in which resin filaments are thermally melted and deposited, the material jetting method, in which the resin ejected from the inkjet head is cured with ultraviolet light, and the curing layer of a photocurable resin solution using a laser is laminated. and laser sintering (SLS/SLM) in which a deposited layer of powder material is sintered with a laser. Patent Literature 1 discloses a nanofiber composite that can be used for a stereolithographic 3D printer.

Patent No. 6256644

An object of the present invention is to provide a powder material suitable for manufacturing a three-dimensional model by a laser sintering 3D printer.

The present invention
including resin powder and nanofibers,
The average particle size is 30 to 80 μm,
a powder material for three-dimensional modeling, in which the content of the nanofibers is 2 to 15% by weight;
I will provide a.

Viewed from another aspect, the present invention provides
A three-dimensional modeled object obtained by applying modeling with a laser sintering 3D printer to the powder material for three-dimensional modeling of the present invention,
I will provide a.

Viewed from another aspect, the present invention provides
A method for producing a three-dimensional model, comprising: obtaining a three-dimensional model by three-dimensionally molding the powder material for three-dimensional modeling of the present invention with a laser sintering 3D printer;
I will provide a.

ADVANTAGE OF THE INVENTION According to this invention, the powder material suitable for manufacture of a three-dimensional structure with a laser sintering 3D printer is achieved.

FIG. 1 is a schematic diagram for explaining the manufacturing process of a three-dimensional structure using a laser sintering 3D printer. FIG. 2 is a schematic diagram showing an example of the powder material of the present invention. FIG. 3 is a cross-sectional view schematically showing an example of the three-dimensional structure of the present invention. FIG. 4 is a cross-sectional view schematically showing another example of the three-dimensional structure of the present invention. FIG. 5 is a graph showing the flexural modulus of the three-dimensional structures produced in Examples, Comparative Examples, and Reference Examples. FIG. 6 is a graph showing the bending strength of the three-dimensional structures produced in Examples, Comparative Examples, and Reference Examples. FIG. 7 is a graph showing the Charpy impact strength of three-dimensional structures produced in Examples, Comparative Examples, and Reference Examples.

The powder material for three-dimensional modeling of the present invention (hereinafter simply referred to as "powder material") is a resin powder material containing resin powder and nanofibers. The average particle size of the powder material is 30-80 μm. The content of nanofibers in the powder material is 2-15% by weight. According to the powder material of the present invention, by applying modeling with a laser sintering 3D printer, for example, a three-dimensional model having excellent mechanical properties can be manufactured. Examples of mechanical properties are flexural modulus, flexural strength and impact strength. It is also possible to manufacture a three-dimensional structure that is particularly excellent in impact strength. Impact strength is, for example, Charpy impact strength defined in Japanese Industrial Standards (hereinafter referred to as "JIS") K 7111-1:2012.

A laser-sintered three-dimensional object is composed of a bonded body (thermally bonded body) of powder materials. When the average particle size is 30 to 80 μm, the bonded state of the powder material is suitable for forming a three-dimensional model having excellent mechanical properties. The lower limit of the average particle size may be 35 μm or more, 40 μm or more, 45 μm or more, or even 50 μm or more. The upper limit of the average particle size may be 75 μm or less, 70 μm or less, or even 65 μm or less. When the average particle size is within these ranges, the powder material of the present invention is particularly suitable for forming a three-dimensional model having excellent mechanical properties. The average particle size can be obtained as d50 from the volume-based particle size distribution measured based on the laser diffraction/scattering method.

Nanofibers can act as reinforcing members that improve the mechanical properties of three-dimensional structures. When the content of nanofibers is 2% by weight or more, the action as a reinforcing member is ensured. When the content is 15% by weight or less, burning of nanofibers due to laser irradiation can be suppressed. Combustion of nanofibers by laser irradiation tends to occur in organic nanofibers and in nanofibers located on the surface of powder particles. The lower limit of the nanofiber content may be 2.5% by weight or more, 3.0% by weight or more, 3.5% by weight or more, or even 4.0% by weight or more. The upper limit of the content may be 13.0% by weight or less, 10.0% by weight or less, 7.5% by weight or less, or even 7.0% by weight or less. When the nanofibers are within these ranges, the action as a reinforcing member becomes more reliable.

The above effect of the nanofiber as a reinforcing member is also based on the improvement of the mechanical properties of the powder material itself due to the inclusion of the nanofiber. This can be confirmed by the mechanical properties of the injection molded body. For example, for a composite material of PA6, which is a type of polyamide, and cellulose nanofiber (hereinafter referred to as "CNF"), which is a type of nanofiber, the bending strength of an injection molded body of PA6 alone that does not contain CNF is 103 MPa. On the other hand, the bending strength of the injection molded article containing 5% by weight of CNF is 120 MPa, and the bending strength of the injection molded article containing 10% by weight of CNF is 145 MPa, which are improved by 16.5% and 40.7%, respectively. In addition, the flexural modulus of an injection molded product of PA6 alone, which does not contain CNF, is 2.53 GPa. On the other hand, the bending elastic modulus of the injection molded product containing 5% by weight of CNF is 3.28 GPa, and the bending elastic modulus of the injection molded product containing 10% by weight is 4.29 GPa, which are improved by 29.6% and 69.5%, respectively. do. The CNF-containing powder particles obtained by pulverizing these injection-molded articles are also presumed to have mechanical properties that are enhanced at the same rate of improvement as the CNF-containing injection-molded articles.

Further, according to the powder material of the present invention, for example, it can be supplied to a laser sintering 3D printer in a state containing a large amount of fine powder. This effect is based on the action of the nanofibers as an agglomeration inhibitor that suppresses agglomeration of fines in the powder material.

A three-dimensional model is typically manufactured in a laser sintering 3D printer as follows (see FIG. 1). The printer 51 includes a preheating bath 52 , a forming bath 53 , a scraper 54 and a laser irradiation device 55 . The bottom plates 58 and 59 of the preheating bath 52 and the forming bath 53 are vertically movable. A powder material 50 is contained in a preheating bath 52 . Powder material 50 is usually preheated to a temperature slightly lower than the melting point of the resin contained in powder material 50 . By preheating, the melting of the powder material by laser irradiation can be accelerated. Therefore, for example, the sweep speed of the laser can be improved, thereby shortening the modeling time. The preheated powder material 50 is flowed into the forming bath 53 by a slide of the scraper 54 and forms a layer of a predetermined thickness in the forming bath 53 . The predetermined thickness varies depending on the size of the printer 51 and the like, but is typically adjusted to approximately 100 to 300 μm. Next, the layer of the powder material 50 in the forming tank 53 is irradiated with a laser 56 from a laser irradiation device 55 to form a bonding layer (thermal bonding layer) of the powder material 50 having a predetermined pattern. be. By repeating the pouring of the powder material 50 from the preheating bath 52 into the molding bath 53 and the formation of the bonding layer by the irradiation of the laser 56, a three-dimensional model is formed. Note that the bottom plate 58 of the preheating bath 52 rises and the bottom plate 59 of the molding bath 53 descends as the molding progresses. The printer 51 is an example of a laser sintering 3D printer. The configuration of the printer is not limited to the above example as long as the thermal bonding of the powder material by laser irradiation is used.

Fine powder tends to aggregate in the preheating bath 52 because it has a large adhesive force between particles and a small heat capacity. Even though the heating is below the melting point, thermal fusion between the fine powders often occurs. If the fine powder agglomerates, the flow of the powder material 50 into the forming tank 53 becomes uneven. For this reason, defects such as warpage and chipping occur in the three-dimensional modeled object, and in the worst case, the three-dimensional modeled object itself cannot be modeled. Nanofibers can act as an aggregation inhibitor that suppresses aggregation of the fine powder. When the content of nanofibers is 2% by weight or more, the action as an aggregation inhibitor is ensured. When the content of nanofibers is within the above preferred range, the action as an aggregation inhibitor becomes more reliable.

For example, the following effects are expected by being able to contain a large amount of fine powder.
(1) It is possible to eliminate the need for a step of removing fine powder in advance for forming a three-dimensional model, thereby reducing the powder material and the manufacturing cost of the three-dimensional model. In conventional powder materials, it is common technical knowledge to remove fine powder in advance by a classification process using a sieve, mesh, or the like, in order to prevent fine powder from agglomerating. Since the fine powder has a high adhesion force, the time and cost required for removal is large.
(2) It is possible to improve the smoothness of the surface of the three-dimensional structure.
(3) Since the fine powder has a small heat capacity, the laser sweep speed can be improved. As a result, it is possible to reduce the time and manufacturing cost required to manufacture the three-dimensional structure.

In addition, since it is possible to contain a large amount of fine powder, it is possible to further improve the mechanical properties. The powder material 1 shown in FIG. 2 includes powder 2 (2A) having a relatively large particle size and powder 2 (2B) having a relatively small particle size. In this powder material 1, a joining layer is formed in a state in which the powder 2B enters the gaps between the powders 2A when the three-dimensional model is formed. By filling the gap with the powder 2B, it is possible to improve the mechanical properties of the bonding layer and the three-dimensional structure in which the layer is laminated.

The degree of fine powder content can be evaluated by particle size distribution measurement based on a laser diffraction/scattering method for powder materials. In the powder material of the present invention, in the volume-based particle size distribution measured based on the laser diffraction/scattering method, the cumulative frequency A with a particle diameter of less than 38 μm and/or the cumulative frequency B with a particle diameter of less than 30 μm is 10% or more. There may be. The cumulative frequency A may be 12% or more, 14% or more, 15% or more, 17% or more, or even 19% or more. The cumulative frequency B may be 12% or more, 13% or more, or even 14% or more. In addition, in the volume-based particle size distribution measured based on the laser diffraction/scattering method, the cumulative frequency C of less than 20 μm in particle diameter may be 5% or more, 6% or more, and further 7% or more. good too.

The resin powder contains, for example, a thermoplastic resin. The resin powder may be composed of a thermoplastic resin. Moreover, the resin powder may contain a thermoplastic resin and a thermosetting resin. An example of a thermosetting resin is an epoxy resin.

The thermoplastic resin is preferably a crystalline resin. A crystalline resin is suitable for forming a three-dimensional model with a laser sintering 3D printer. A crystalline resin usually has a melting point and a recrystallization temperature after melting. By forming the next bonding layer after forming the bonding layer at a temperature equal to or higher than the melting point and before the temperature of the layer drops below the recrystallization temperature, the bonding layers can be more reliably bonded. The difference between the recrystallization temperature and the melting point is preferably 30°C or more, more preferably 40°C or more. Recrystallization temperature and melting point can be evaluated by differential scanning calorimetry (DSC).

The resin powder may contain at least one selected from polyamide, polyolefin and polylactic acid, and may be composed of the at least one. Polyamides, polyolefins and polylactic acid are typically thermoplastic and crystalline resins. Moreover, the difference between the recrystallization temperature and the melting point of polyamide, polyolefin and polylactic acid is usually 30° C. or more. However, the resin that can be contained in the resin powder is not limited to the above examples. Moreover, the crystalline resin and the thermoplastic resin are not limited to the above examples.

When the resin powder contains polyamide, it is possible to form a three-dimensional model having particularly excellent mechanical properties. Examples of polyamides are at least one selected from PA6, PA12 and PA610. However, the polyamide is not limited to the above examples.

Examples of polyolefins are polyethylene and polypropylene. However, the polyolefin is not limited to the above examples.

The average particle size (d50) of the resin powder is, for example, 35-85 μm, and may be 45-75 μm, 55-70 μm. The cumulative frequency A and/or cumulative frequency B of the resin powder is, for example, 8% or more, and may be 10% or more, 11% or more, or even 12% or more. The cumulative frequency D (described later) of the resin powder is, for example, 80% or more, 81% or more, and may be 82% or more.

Nanofibers are fibrous substances with an average fiber diameter of less than 1000 nm. The upper limit of the average fiber diameter may be 500 nm or less, 250 nm or less, 100 nm or less, 80 nm or less, 60 nm or less, or even 40 nm or less. The lower limit of the average fiber diameter is, for example, 1 nm or more, and may be 5 nm or more, or even 10 nm or more. The average fiber length of the nanofibers is, for example, 10-1000 μm, and may be 100-500 μm.

Examples of nanofibers are CNF, cellulose nanocrystals, chitin nanofibers, chitosan nanofibers and carbon nanotubes. However, nanofibers are not limited to the above examples. The nanofibers are preferably CNF because of their excellent action as aggregation inhibitors. CNF may be unmodified CNF or modified CNF in which hydroxyl groups of cellulose are modified with hydrophobic groups or the like. An example of a hydrophobic group is the acetyl group.

Coarse powder may be removed from the powder material of the present invention. For example, in the volume-based particle size distribution measured based on the laser diffraction/scattering method, the cumulative frequency D of particles having a diameter of 115 μm or less may be 85% or more, 85.5% or more, and further 86% or more. There may be. Coarse powder can be removed by classification using a sieve, mesh, or the like. A test sieve specified in JIS Z8801:2006 can be used for the classification treatment.

The powder material of the present invention may contain materials other than resin powder and nanofibers. Examples of other materials are colorants, antistatic agents, heat stabilizers, flame retardants, antioxidants and fillers. Other materials may be organic or inorganic. However, other materials are not limited to the above examples. When other materials are included, their content may be, for example, 5% by weight or less, 4% by weight or less, or even 3% by weight or less. The lower limit of the content is, for example, 0.3% by weight or more.

Examples of materials that make up the filler are carbon, glass, metals, metal oxides and silica. Examples of metal oxides are alumina and titania. The shape of the filler is, for example, fibers, beads, flakes. The carbon may be carbon fiber. The glass may be glass fibers or glass beads. However, the filler is not limited to the above examples.

The powder material of the present invention can also be used for applications other than three-dimensional modeling by a laser sintering 3D printer.

The powder material of the present invention can be formed, for example, by mixing resin powder and nanofibers. The powder material may be formed by forming a resin molded body (for example, sheet, strand, scale body, etc.) containing resin and nanofibers, and pulverizing this. The resin molding can be formed, for example, by melt-kneading and molding using a twin-screw extruder or the like. Grinding is, for example, freeze-grinding. However, the method of forming the powder material of the present invention is not limited to the above examples.

[Three-dimensional object]
An example of the three-dimensional structure of the present invention is shown in FIG. A three-dimensional modeled object 11 in FIG. 3 is a modeled object obtained by applying modeling by a laser sintering type 3D printer to the powder material 1 of the present invention. The three-dimensional structure 11 is a joined body of (the powder 2 contained in) the powder material 1 . The three-dimensional structure 11 may have gaps 12 between the powder materials 1 joined together.

The three-dimensional structure 11 can have high mechanical properties. The bending elastic modulus of the three-dimensional structure 11 is, for example, 0.2 GPa or more, 0.5 GPa or more, 1.0 GPa or more, 1.5 GPa or more, 2.0 GPa or more, or even 2.5 GPa or more. good. The upper limit of the bending elastic modulus is, for example, 5 GPa or less. The bending strength of the three-dimensional structure 11 is, for example, 5 MPa or more, and may be 15 MPa or more, 25 MPa or more, 50 MPa or more, 70 MPa or more, or even 90 MPa or more. The upper limit of bending strength is, for example, 150 MPa or less. However, the flexural modulus and flexural strength are values obtained in accordance with Method A (a method for obtaining a bending stress/bending strain curve at one test speed) defined in JIS K7171:2016.

7. The Charpy impact strength of the three-dimensional structure 11 is, for example, 0.5 kJ/m ² or more, 1.0 kJ/m ² or more, 3.0 kJ/m ² or more, or 5.0 kJ/m ² or more. It may be 0 kJ/m ² or more, or even 9.0 kJ/m ² or more. The upper limit of the Charpy impact strength is, for example, 15 kJ/m ² or less. However, the Charpy impact strength is a value obtained as a notch-free Charpy impact strength by edgewise impact according to the provisions of JIS K7111-1:2012.

Additional resin 14 may be introduced into the gap 12, as shown in FIG. In other words, the three-dimensional structure 11 has a matrix 13 composed of the powder materials 1 bonded together, and further resin is added to the gaps 12 between the bonded powder materials 1 in the matrix 13 . 14 may be introduced into the structure. By introducing the resin 14, the mechanical properties of the three-dimensional structure 11 can be further improved.

The resin 14 is, for example, at least one selected from epoxy resins and acrylic resins. However, the resin 14 is not limited to the above examples. Resin 14 may be a thermosetting resin.

The three-dimensional modeled object 11 into which the resin 14 has been introduced is manufactured, for example, by performing a post-process of introducing the resin 14 into the resulting modeled object after modeling the three-dimensional modeled object with a laser sintering 3D printer. can. In the post-process, for example, a precursor of the resin 14 (eg, epoxy resin) is introduced into the gap 12 and the introduced precursor is treated (eg, cured). In a post-process, a solution containing the resin 14 (for example, an acrylic resin) may be introduced into the gap 12, and the solvent may be removed from the introduced solution by drying or the like. The solution may be a resin in solution.

Examples of the three-dimensional molded object 11 include vehicle exterior or interior parts such as bumpers, door trims and wheel covers, medical instruments such as artificial legs, artificial hands and treatment instruments, electronic parts, lighting equipment parts, sporting goods, and molds ( (including prototype molds). However, the three-dimensional structure 11 is not limited to the above example.

[Method for manufacturing three-dimensional object]
In the production method of the present invention, the powder material of the present invention is three-dimensionally molded by a laser sintering 3D printer to obtain a three-dimensional model 11 . An example of the three-dimensional structure 11 to be manufactured is as described above. The configuration and specific operation method of the laser sintering 3D printer are not limited. The manufacturing method of the present invention may include arbitrary steps as long as the three-dimensional structure 11 is obtained. The post-process described above may be performed on the obtained three-dimensional structure 11 .

EXAMPLES The present invention will be described in more detail below with reference to examples. The present invention is not limited to the specific embodiments shown below.

(Example 1)
PA6 pellets (manufactured by Ube Industries, Ltd., POLYAMIDE6, P1011F) and CNF produced according to the manufacturing method disclosed in Japanese Patent No. 6091589 (fiber diameter in the range of 10 nm to several 10 μm and fiber diameter in the range of several 10 nm to several 100 μm average fiber length (average fiber diameter is less than 1000 nm) was melt kneaded. Next, the kneaded material was discharged from the extruder to obtain a scaly resin molding (CNF content: 30% by weight). Next, the obtained resin molded body and PA6 pellets (manufactured by Ube Industries, Ltd., POLYAMIDE6, P1011FB) are diluted and mixed to obtain a pellet-shaped resin molded body having a CNF content of 5.0% by weight. Obtained. Next, the obtained resin molded body was freeze-pulverized, followed by classification treatment for removing coarse powder to obtain the powder material of Example 1 (CNF content: 5.0% by weight). Ta. A test sieve with a nominal opening of 106 μm specified in JIS Z8801-1 was used for the classification treatment. The classification process was performed twice.

(Examples 2-5)
By changing the mixing ratio of the resin molded body and the PA6 pellet, the CNF content in the powder material is changed to 7.5% by weight, 10.0% by weight, 12.5% by weight or 15.0% by weight. Powder materials of Examples 2 to 5 were obtained in the same manner as in Example 1 except that the control was performed.

(Comparative example)
A comparative powder material composed of PA6 was obtained in the same manner as in Example 1, except that CNF was not added.

(Reference example)
The powder material of the comparative example was subjected to a classification process for removing fine powder to obtain the powder material of the reference example. A test sieve with a nominal opening of 38 μm specified in JIS Z8801-1 was used for the classification treatment. The classification process was performed twice.

Particle size distribution measurement using a laser diffraction/scattering particle size distribution measuring device (LA-950V2, manufactured by Horiba, Ltd.) was performed for each powder material produced, and the average particle size and the cumulative particle size of less than 38 μm were measured. A frequency A, a cumulative frequency B with a particle size of less than 30 μm, and a cumulative frequency D with a particle size of 115 μm or less were determined. The measurement was performed twice, and the average value was used as each characteristic. Measurement conditions are as follows.
Sample pretreatment: none Measurement unit: dry type (compressed air dispersion)
Compressed air pressure: 0.3 MPa
Measurement mode: One-shot mode Measurement range: 0.1 to 3000 μm
Particle size standard: Volume standard Sample refractive index: 1.53

Each of the prepared powder materials was three-dimensionally shaped by a laser sintering 3D printer to prepare a rectangular parallelepiped (width 10 mm x length 76 mm x thickness 4 mm) test piece. The conditions for three-dimensional modeling are as follows.
Laser type: _CO2 laser Laser wavelength: 10.6 μm
Laser power: 10W
Laser sweep speed: 5 m/sec Bonding layer thickness: 150 µm

The mechanical properties (flexural modulus, bending strength and Charpy impact strength) of the prepared test pieces were evaluated as follows.

[Flexural modulus and bending strength]
The flexural modulus and flexural strength were evaluated according to Method A defined in JIS K7171:2016. As a testing machine, Tensilon UCT-30T manufactured by Orientec was used. The distance between fulcrums was 64 mm, and the test speed was 2 mm/min. The measurement temperature was 25° C. and the measurement humidity was 50% RH. Five test pieces were evaluated, and the average value was taken as the flexural modulus and flexural strength of the test piece.

[Charpy impact strength]
The Charpy impact strength of the test piece was evaluated as Charpy impact strength without a notch by edgewise impact in accordance with JIS K7111-1:2012. CHARPACK45C manufactured by Yonekura Seisakusho Co., Ltd. was used as the testing machine. The measurement temperature was 25° C. and the measurement humidity was 50% RH. Ten test pieces were evaluated, and the average value was taken as the Charpy impact strength of the test piece.

The evaluation results are shown in Table 1 below. 5, 6 and 7 show the evaluation results of flexural modulus, flexural strength and Charpy impact strength, respectively. In addition, the test piece of the comparative example was fragile, and the measurement of each of the above mechanical properties was difficult (impossible to measure).

As shown in Table 1 and FIGS. 5 to 7, with the powder material of the example, a three-dimensional model having better mechanical properties than the powder material of the comparative example could be formed. In addition, in Examples 1 to 3, the flexural modulus and Charpy impact strength, particularly Charpy impact strength, were improved compared to the reference example in which CNF was not included and fine powder was removed. Furthermore, in Example 1, the bending strength was improved as compared with the reference example. In Examples 4 and 5, a three-dimensional model with inferior mechanical properties compared to the reference example was formed, but contrary to the technical common sense of those skilled in the art, it was used in a laser sintering 3D printer without removing fine powder. It was possible to supply and mold a three-dimensional modeled object.

The powdery material for three-dimensional modeling of the present invention can be used in the same applications as the conventional powdery material for three-dimensional modeling, for example, for modeling three-dimensional objects with a 3D printer.

Claims (8)

including resin powder and nanofibers,
The average particle size is 30 to 80 μm,
The content of the nanofiber is 2 to 15% by weight,
The nanofibers are cellulose nanofibers, cellulose nanocrystals, chitin nanofibers, chitosan nanofibers, or carbon nanotubes,
A powder material for three-dimensional modeling, wherein the cumulative frequency of particles with a diameter of less than 38 μm is 10% or more in a volume-based particle size distribution measured based on a laser diffraction/scattering method. The powder material for three-dimensional modeling according to claim 1, wherein the resin powder contains a thermoplastic resin. 3. The powder material for three-dimensional modeling according to claim 1, wherein the nanofibers are cellulose nanofibers , cellulose nanocrystals, chitin nanofibers, or chitosan nanofibers . The powder for three-dimensional modeling according to any one of claims 1 to 3, wherein the cumulative frequency of particles having a particle diameter of less than 30 µm is 10% or more in a volume-based particle size distribution measured based on a laser diffraction/scattering method. material. The powder material for three-dimensional modeling according to any one of claims 1 to 4, wherein the cumulative frequency of particles with a diameter of 115 µm or less is 85% or more in a volume-based particle size distribution measured based on a laser diffraction/scattering method. The powder material for three-dimensional modeling according to any one of claims 1 to 5, wherein the resin powder contains at least one selected from polyamide, polyolefin and polylactic acid. 7. The powder material for three-dimensional modeling according to claim 6, wherein the polyamide is at least one selected from PA6, PA12 and PA610. A method for producing a three-dimensional structure, comprising three-dimensionally molding the powder material for three-dimensional structure according to any one of claims 1 to 7 with a laser sintering 3D printer to obtain a three-dimensional structure.

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