JP6027256B2 - Method for creating 3D object and coating method for 3D object - Google Patents

Description

  The present invention relates to a method for creating a 3D structure and a method for coating a 3D structure.

  For example, a method described in Patent Document 1 is known as a method for creating a 3D model using a heat-soluble resin laminated 3D printer. As this heat-soluble resin, for example, ABS (acrylonitrile butadiene styrene) resin, PLA (polylactic acid) resin, polyamide resin, or the like is used.

  As described in the same document, as shown in FIG. 1, a 3D object formed by a heat-dissolving resin laminated type 3D printer is scanned with resin discharged from a printer head, for example, in the Y-axis direction and sequentially in the X-axis direction. A plane is formed by stacking, and the plane is formed and then sequentially stacked in the Z-axis direction. Here, as shown in FIGS. 2 and 3, the stacking pitch P is a width (resin diameter) stacked on the X axis and the Z axis, and the difference in the pitch P causes a difference in the appearance finish and the modeling time. When the pitch P is narrow, the gap S between the resins R becomes small, so that it takes time to stack and the modeling time becomes long, but the surface of the model is finished cleanly. On the contrary, when the pitch P is wide, the modeling time is shortened, but as shown in FIG. 3, the gap S between the resins R becomes large, the unevenness (lamination line L) on the surface of the molded object is conspicuous, and the appearance is inferior. The difference in modeling time becomes a cost difference, and it takes time and cost to finish the appearance of the modeled object beautifully. If the cost is suppressed, the appearance is inferior, and it is insufficient as a modeling sample. In addition, resin defects and cracks may occur during modeling, and this repair took time.

JP-A-9-24552

  In view of the conventional situation, the present invention provides a 3D model creation method and a 3D model coating method capable of creating a model in a short time while having strength and good appearance. With the goal.

  In order to achieve the above object, the method of creating a 3D structure according to the present invention is characterized by discharging a heat-soluble resin with a 3D printer and forming a 3D structure by three-dimensionally laminating at a predetermined stacking pitch. The coating agent is infiltrated and filled in the gaps of the heat-soluble resin laminated by applying a coating agent mainly composed of 2-cyanoacrylate on the surface of the formed 3D model, and the laminated Curing the coating agent applied so as to be softer than the heat-soluble resin or softer than the laminated heat-soluble resin, and polishing the surface of the 3D model after the coating agent is cured The purpose is to fill a gap along the laminated line formed by the laminated heat-soluble resin.

According to the above feature, since the coating agent is filled by infiltrating the gaps in the heat-soluble resin, the gaps formed between the laminated heat-soluble resins are filled with the coating agent, and the surface of the 3D object is Smoothness is improved. Moreover, since 2-cyanoacrylate ester of a coating agent is easy to osmose | permeate, the intensity | strength of the 3D modeling thing by a heat-soluble resin lamination | stacking 3D printer can be improved by hardening of the 2-cyanoacrylate ester. And since the surface is grind | polished after hardening of a coating agent, as shown, for example in FIG.4 (d), the dimension of a molded article can be maintained with a small grinding | polishing amount, and the surface can be smoothed, the same figure (b). It is not necessary to polish many portions R ′ of the heat-soluble resin as shown in FIG. Therefore, the aesthetics of the model can be improved without reducing workability. Thus, even if the lamination pitch of the 3D printer is widened, the strength of the 3D model may be reduced due to the composite property of improving the smoothness of the surface due to the penetration of 2-cyanoacrylate and improving the strength of the model. In addition, filling the gap along the laminated line prevents the laminated line from being noticeable, and the appearance is also beautiful. And since it can produce with a wide lamination pitch, production time can be shortened and manufacturing cost can be held down.
The lamination pitch is preferably 0.1 mm or more and 0.5 mm or less, and the viscosity of the coating agent is preferably 1 mPa · s or more and 100 mPa · s or less.
The coating agent may be adjusted so that the durometer hardness after curing is 70% or more and 125% or less of the durometer hardness of the heat-soluble resin.

  In addition, the 3D structure coating method according to the present invention is characterized by a coating agent on the surface of a 3D structure formed by three-dimensionally laminating at a predetermined lamination pitch while discharging a heat-soluble resin with a 3D printer. In the method for coating a 3D structure, the coating agent is mainly composed of 2-cyanoacrylic acid ester, and the coating agent is permeated and filled in the gaps between the laminated heat-soluble resins. The coating agent applied so as to have a hardness equivalent to the laminated heat-soluble resin or softer than the laminated heat-soluble resin is cured, and after the coating agent is cured, the surface of the 3D model is formed. By polishing, the gap along the laminated line formed by the laminated heat-soluble resin is filled.

  According to the above feature, since the coating agent is filled by infiltrating the gaps in the heat-soluble resin, the gaps formed between the laminated heat-soluble resins are filled with the coating agent, and the surface of the 3D object is Smoothness is improved. Moreover, since 2-cyanoacrylate ester of a coating agent is easy to osmose | permeate, the intensity | strength of the 3D modeling thing by a heat-soluble resin lamination | stacking 3D printer can be improved by hardening of the 2-cyanoacrylate ester. And since the surface is grind | polished after hardening of a coating agent, as shown, for example in FIG.4 (d), the dimension of a molded article can be maintained with a small grinding | polishing amount, and the surface can be smoothed, the same figure (b). It is not necessary to polish many portions R ′ of the heat-soluble resin as shown in FIG. Therefore, the aesthetics of the model can be improved without reducing workability. Thus, even if the lamination pitch of the 3D printer is widened, the strength of the 3D model may be reduced due to the composite property of improving the smoothness of the surface due to the penetration of 2-cyanoacrylate and improving the strength of the model. In addition, filling the gap along the laminated line prevents the laminated line from being noticeable, and the appearance is also beautiful. And since it can produce with a wide lamination pitch, production time can be shortened and manufacturing cost can be held down.

  The lamination pitch is preferably 0.1 mm or more and 0.5 mm or less, and the viscosity of the coating agent is preferably 1 mPa · s or more and 100 mPa · s or less. Thereby, since the coating agent applied to the surface is more smoothly penetrated and filled in the gaps of the heat-soluble resin to be cured, the aesthetics and the strength are improved in a more complex manner.

  Furthermore, the cured coating agent may be as hard as the heat-soluble resin or softer than the heat-soluble resin. For example, the coating agent may be adjusted so that the durometer hardness after curing is 70% or more and 125% or less of the durometer hardness of the heat-soluble resin. Thereby, when smoothing the surface of a modeling thing by grinding | polishing, it can grind | polish with sufficient balance, without being biased | biased by one material, and can improve aesthetics more.

According to the features of the 3D model creation method and 3D model coating method according to the present invention, it is possible to create a 3D model in a short time while having strength and good appearance.

  Other objects, configurations, and effects of the present invention will become apparent from the following embodiments of the present invention.

It is explanatory drawing explaining the lamination | stacking condition of resin in the 3D modeling thing of a 3D printer of a hot melt resin lamination type. It is explanatory drawing explaining the lamination | stacking pitch in FIG. It is explanatory drawing explaining the laminated line in FIG. It is a figure which shows the grinding | polishing state of a molded article typically, (a) is the state before grinding | polishing which has not apply | coated the coating agent, (b) is the state after grinding | polishing of (a), (c) is a coating agent. The applied state before polishing, (d) shows the state after polishing (c). It is a perspective view which shows the 3D modeling thing created with the heat-soluble resin lamination type 3D printer. It is a figure which shows the application | coating process of the coating agent to 3D modeling thing. It is a figure which shows the application | coating process of the hardening accelerator to 3D modeling thing. It is a figure which shows the grinding | polishing process of 3D modeling thing. It is a figure which shows the finish after the grinding | polishing process of 3D modeling thing. It is an enlarged view of the modeling object surface which shows the grinding | polishing condition of 3D modeling object which has not apply | coated the coating agent. It is an enlarged view of the modeling object surface which shows the grinding | polishing condition of 3D modeling object which apply | coated the coating agent. It is a figure which shows the restoration process of 3D modeling thing. It is a figure which shows the state which dropped the surfacer of 3D modeling object by grinding | polishing.

Next, the present invention will be described in more detail with reference to the accompanying drawings as appropriate.
A coating agent 1 for a heat-soluble resin laminated 3D printer according to the present invention (hereinafter referred to as a “coating agent”) includes a heat-soluble resin such as ABS resin, PLA (polylactic acid) resin, polyamide resin, etc. It is used for a modeled object formed by a 3D printer that is laminated in the Z-axis direction.

  The manufacturing cost of the three-dimensional structure formed by the 3D printer is determined by the stacking pitch P and the stacking time. Although it depends on the printer model, when the minimum and maximum stacking pitches P are compared, the stacking time is about twice or more, and the manufacturing cost is about 1.5 times. By increasing the stacking pitch P, the resin R ejected from the printer head is increased and the number thereof is decreased, so that the stacking time is shortened and the cost is suppressed. However, since the resin R becomes large, the gap S between the adjacent resins R becomes large, and the unevenness on the surface of the molded product 100 becomes large. Therefore, the laminated line L formed when the adjacent resins R come into contact with each other is conspicuous, and the appearance of the modeled object is deteriorated.

  As shown in FIG. 4A, unevenness is formed on the surface of the 3D structure 100 by the laminated resin R. In order to eliminate the unevenness, as shown in FIG. 4B, the exposed resin R 'must be scraped, and the 3D object is reduced. In addition, in the example shown in FIG. Further, the polishing scraps of the resin R enter the gap S, and the aesthetic appearance is impaired. Although it is conceivable to eliminate the unevenness by polishing the resin R with, for example, a solvent without polishing, it is difficult to control the size and shape with this method.

  On the other hand, as shown in FIG. 4C, when the coating agent 1 is applied, the coating agent 1 is filled by permeating the gap S and the outer surface of the resin R is thinly covered. Then, the 2-cyanoacrylic acid ester of the coating agent 1 filled in the gap S is cured, so that the gap S is filled and the strength of the entire shaped article 100 is increased. Further, as shown in FIG. 4 (d), the coating agent 1 on the surface of the resin R may be polished, so that it is possible to improve the aesthetics by smoothing the surface while maintaining the accuracy of the size and shape of the molded object. Become. Thus, the combined effect of improving the smoothness and strength of the shaped article can be obtained by infiltrating the coating agent mainly composed of 2-cyanoacrylate. Moreover, when the coating agent 1 is applied to the modeled object 100 as shown in the figure, it becomes smooth if it is polished to such an extent that the outer dimensions do not change, and the polishing amount is small and the working time is not increased.

  Further, in FIG. 4D, even when the coating agent 1 is not sufficiently overflowing from the gap S, the polishing amount of the resin R is as shown in FIG. ) Is sufficiently small as compared with the example. Thus, since the increase in the polishing amount is suppressed, the workability is not lowered and the surface can be smoothed. In addition, in such a case, by setting the hardness after curing of the coating agent 1 and the hardness of the heat-soluble resin equal, it is possible to prevent the material from being biased toward one of the materials.

  By applying the coating agent 1 to a 3D model having a wide stacking pitch P, the gap S formed on the surface of the model 100 can be buried and the layered line L can be removed. In addition, the time required for finishing is reduced and the cost is reduced as compared with the production of a narrow shaped article having a long lamination pitch P, and the aesthetics of the finish is improved. Moreover, the finish of 3D modeling thing can be further improved by using the coating agent 1 for the repair of the defect | deletion part and crack of a modeling thing.

The stacking pitch P is, for example, 0.05 mm to 0.5 mm, depending on the 3D printer model, and is 0.1 mm to 0.5 mm in the present embodiment, for example.
The coating agent 1 which concerns on this invention has 2-cyanoacrylic acid ester as a main component. Various additives such as thickeners, diluents and viscosity reducing agents, stabilizers, enhancers, colorants, accelerators, plasticizers, ultraviolet absorbers and the like are appropriately added to the coating agent 1 as necessary. .

  The viscosity of the coating agent 1 is adjusted to be 0.1 mPa · s or more and 1000 mPa · s or less. If the viscosity is too high, the penetrability is poor and the coating agent 1 does not enter the gaps S between the resins R, and the layer of the coating agent 1 becomes thick and cures slowly. On the other hand, if the viscosity is too low, the resin passes through the gap S between the resins R, and the gap S cannot be filled. Preferably, it is 1 mPa · s or more and 100 mPa · s or less. If it is the range of this viscosity, the clearance gap S of the 3D modeling object 100 whose above-mentioned lamination pitch P is 0.1 mm-0.5 mm can be filled. In the case of repair, 500 mPa · s or more, preferably a jelly shape is suitable. Therefore, the viscosity of the coating agent 1 is adjusted to the above numerical range.

  Furthermore, the coating agent 1 is adjusted so that the hardness after curing thereof is equal to or softer than the hardness of the heat-soluble resin constituting the 3D model. If the hardened coating agent is harder than the heat-soluble resin, the 3D model is exclusively scraped, and conversely if the hardened coating agent is soft, the coating agent is exclusively scraped, and the surface is not uniform. For example, the durometer hardness of the ABS resin is 75 to 85, the durometer hardness of the PLA resin is 75 to 83, and the durometer hardness of the polyamide resin is 65 to 75. On the other hand, the durometer hardness after curing of the coating agent 1 can be adjusted by the type of 2-cyanoacrylic acid ester described later and the amount of plasticizer added to the coating agent 1. The durometer hardness of the cured coating agent is adjusted to a value of 70% or more and 125% or less with respect to the durometer hardness of the heat-soluble resin. Thereby, since the coating agent 1 becomes equivalent hardness with respect to a heat-soluble resin, one material does not become too soft, polishing property is good and workability is also improved. More preferably, it is in the range of 80% or more and less than 100%. Since most of the 3D structure 100 is covered with the coating agent 1, the workability is further improved by adjusting the durometer hardness so that the hardness of the coating agent 1 after curing is slightly softer than the heat-soluble resin. To do.

  As 2-cyanoacrylate ester, methyl 2-cyanoacrylate, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, n-pentyl, n-octyl, methoxyethyl, ethoxyethyl, ethoxypropyl Such esters may be used, but 2-cyanoacrylic acid esters generally used for cyanoacrylate adhesives can be used. These 2-cyanoacrylic acid esters can be used alone or in combination of two or more. In view of curing speed, ethyl cyanoacrylate and ethoxyethyl cyanoacrylate and methoxyethyl cyanoacrylate are preferable in terms of odor. By curing the 2-cyanoacrylic acid ester, the gap S of the resin R is filled to smooth the surface and the strength of the 3D structure is improved. Further, the removal of the laminated line L is facilitated.

  Thickeners include polymethyl methacrylate, copolymers of methyl methacrylate and acrylic esters, copolymers of methyl methacrylate and other methacrylic esters, acrylic rubber, urethane rubber, hydrophobic silica, etc. Although mentioned, the thickener generally used for a cyanoacrylate adhesive can be used. These thickeners can be used alone or in combination of two or more. A thickener is mix | blended in 0.1 to 30 weight part with respect to 100 weight part of 2-cyanoacrylic acid ester. Preferably, it is 1 part by weight or more and 25 parts by weight or less. If it is less than this, the viscosity cannot be increased, and if it is more than this, it remains without dissolving.

  The diluent and the viscosity reducing agent lower the viscosity of the coating agent in order to improve the permeability when the lamination pitch is fine. Diluents and viscosity reducing agents include acetone, methyl ethyl ketone, chloroform, dichloromethane, trichloroethylene, 1,1-dichloro-1-fluoroethane, etc., but diluents generally used for cyanoacrylate adhesives Can be used. These diluents and viscosity reducing agents can be used alone or in combination of two or more. In addition, a diluent and a viscosity reducing agent are mix | blended in the range of 0.1 to 200 weight part with respect to 100 weight part of 2-cyanoacrylic acid ester. More preferably, it is 10 to 150 parts by weight. Below this range, there is no effect of reducing the viscosity, and when it exceeds this range, the ratio of cyanoacrylate becomes too low, so that no coating agent remains on the surface.

Examples of the stabilizer include sulfur dioxide, methanesulfonic acid, p-toluenesulfonic acid, boron trifluoride diethyl ether, HBF ₄ , hydroquinone, hydroquinone monomethyl ether, t-butylcatechol, catechol and pyrogallol. The stabilizer used for the cyanoacrylate adhesive can be used. These stabilizers can be used alone or in combination of two or more. In addition, a stabilizer is mix | blended in ^0.01x10-6 weight part or more and 5 weight part or less with respect to 100 weight part of 2-cyanoacrylic acid ester. Preferably, it is 1 × 10 ⁻⁶ or more and 0.5 part by weight or less.

  Examples of the accelerator include diethylene glycol, polyethylene glycol, polyethylene glycol monoalkyl, polyethylene glycol dialkyl, 12-crown-4, 15-crown-5, 18-crown-6, calixarene, etc. Stabilizers used in system adhesives can be used. These accelerators can be used alone or in combination of two or more. In addition, an accelerator is mix | blended in 0.0001 weight part or more and 5 weight part or less with respect to 100 weight part of 2-cyanoacrylic acid ester. Preferably, they are 0.01 weight part or more and 1 weight part or less.

  Plasticizers include triethyl acetyl citrate, tributyl acetyl citrate, dimethyl phthalate, diethyl phthalate, dibutyl phthalate, diisodecyl phthalate, dihexyl phthalate, dioctyl phthalate, bis (2-ethylhexyl) phthalate, ethylene carbonate The plasticizer generally used for cyanoacrylate adhesives can be used. These plasticizers can be used alone or in combination of two or more. In addition, a plasticizer is mix | blended in 0.1 weight part or more and 100 weight part or less with respect to 100 weight part of 2-cyanoacrylic acid ester. Below this range, there is no effect of adding a plasticizer, and abrasiveness and machinability are the same as those without addition. Beyond this range, it becomes too soft and, on the other hand, the abrasiveness and machinability deteriorate. Preferably, it is 10 parts by weight or more and 50 parts by weight or less.

  Examples of ultraviolet absorbers include benzotriazole ultraviolet absorbers and hydroxybenzophenone ultraviolet absorbers, and ultraviolet absorbers generally used for cyanoacrylate adhesives can be used. These ultraviolet absorbers can be used alone or in combination of two or more. In addition, an ultraviolet absorber is mix | blended in 0.001 to 1 weight part with respect to 100 weight part of 2-cyanoacrylic acid ester. Preferably, it is 0.01 parts by weight or more and 0.5 parts by weight or less.

  Typical additives include those mentioned above, but are not limited to these, and various additives that are generally added to cyanoacrylate adhesive compositions are contained at concentrations that are usually added. Also good. For example, an optical brightener may be further added to prevent discoloration of the coating agent over time. Further, a colorant such as fluoranthene or anthracene may be added.

  Furthermore, you may use a hardening accelerator (for example, brand name: Arteco spray primer) with a coating agent. Thereby, the hardening time of a coating agent is further shortened and the increase in manufacturing cost is suppressed. Moreover, since the machinability is improved, the appearance becomes more beautiful by polishing. Here, as components of the curing accelerator, for example, cyclopentane, ethyl alcohol, acetone, heptane and the like as the solvent, dimethylaniline, dimethyl paratoluidine, diethyl metatoluidine and the like as the curing component, and LPG, dimethyl ether and the like as the propellant gas are raised. .

Next, a method for creating a 3D structure using the coating agent according to the present invention will be described.
A 3D shaped object having a predetermined shape is created using the above-described hot-melt resin laminated 3D printer. As shown in FIG. 5, a plurality of laminated lines L appear on the surface of the 3D structure 100. For example, as shown in FIG. 6, the coating agent 1 is applied to the surface of the 3D model 100 with a dedicated brush 10, and the coating agent 1 is infiltrated and filled into the concave portions (the gaps S between the resins R). The coating agent 1 dries (hardens) in a few minutes, and the surface of the molded article 100 becomes glossy. When the laminated line L is rough, that is, when the laminated pitch P is wide, the coating agent 1 may be applied twice and three times. In addition, if the tip of the dedicated brush 10 is made of PBT, if the tip is immersed in the coating agent 1, the tip of the tip is hard to solidify and can be used repeatedly. After the coating agent 1 is applied, a curing accelerator 20 is applied as shown in FIG. Thereby, the curing time can be further shortened.

  If the coating agent 1 hardens | cures, as shown in FIG. 8, the laminated line L will be lose | disappeared from the surface of the molded article 100 by grinding | polishing finishing. In the polishing finish, for example, first, rough cutting is performed with the polishing papers # 320 to # 400, and polishing is performed with the polishing papers # 800 to # 1000, and the laminated line L is erased to finish the glossy model. In addition, the gloss finish is performed with the 3000th and 8000th compounds. Thereby, as shown in FIG. 9, it becomes the 3D modeling object 100 which does not have the lamination | stacking line L on the surface, and has glossiness.

  As schematically shown in FIG. 10, in order to shorten the modeling time, when the coating agent 1 is not applied to the surface of the 3D model 100 created by roughing (enlarging) the stacking pitch P, the polishing operation as described above is performed. Even if it is, the unevenness on the surface cannot be completely removed by polishing, and the laminated line L cannot be erased. Further, the abrasive powder is mixed into the gap S, and the aesthetics are also lowered.

  On the other hand, as schematically shown in FIG. 11, when the coating agent 1 is applied to the surface of the molded article 100 created by roughening the lamination pitch P in order to shorten the modeling time, the coating agent is applied to the gap S between the resins R. 1 is impregnated, and polishing can be performed as described above to remove the laminated line L and finish the surface smoothly. In other words, the present invention can also be said to be a coating method for a 3D structure manufactured by a hot-melt resin-laminated 3D printer.

  Here, when the surface of the 3D structure 100 is dented or cracked D due to cracks or the like, for example, as shown in FIG. And the said coating agent 1 is apply | coated to the crack D and its periphery, and it grind | polishes similarly to the above.

In addition, after the surface to which the coating agent 1 is applied is polished as shown in FIG.
For example, the substrate is treated with abrasive paper # 320 to # 400, and then the surfacer is uniformly applied. After drying, remove the surfacer with abrasive paper # 1000 and check for any polishing residue or grooves. If necessary, repair with the above coating agent 1 or putty. After repair, the surfacer is applied again and polished with abrasive paper # 1000. Then, paint is applied, and after drying, clear paint is applied and polished with a compound.

  Here, the inventors conducted the following experiments in order to confirm the usefulness of the present invention. In addition, although this invention is demonstrated referring a following example and a comparative example, this invention is not limited to these.

As the modeled object 1, a modeled object having a size of 120 × 50 × 30 mm was made of ABS resin at a lamination pitch of 0.254 mm. The modeling time was 50 minutes.
As the modeled object 2, a modeled object having a size of 120 × 50 × 30 mm was made of PLA resin at a lamination pitch of 0.127 mm. The modeling time was 120 minutes.
As the modeled object 3, a modeled object having a size of 120 × 50 × 30 mm was made of ABS resin at a lamination pitch of 0.127 mm. The modeling time was 120 minutes.

[Example 1]
A cyanoacrylate composition containing 20 ppm by weight of sulfur dioxide, 0.1 part by weight of hydroquinone and 20 parts by weight of dimethyl phthalate was prepared with respect to 100 parts by weight of ethyl-2-cyanoacrylate as a coating agent. The durometer hardness after curing of this coating agent was set to 70. As a finishing operation, the cyanoacrylate composition was applied to the surface of the molded article 100 with a brush. In that case, it apply | coated so that a brush might be inserted in the laminated line (gap) of a molded article. After 10 minutes, it was confirmed that it was naturally cured, and polishing work was performed. In the polishing operation, the abrasive paper was changed from coarse to fine, # 400 → # 1000 → # 3000 → # 8000, and the laminated line was shaved to finish it smoothly.
[Example 2]
A cyanoacrylate composition containing 20 ppm by weight of sulfur dioxide and 0.1 part by weight of hydroquinone with respect to 100 parts by weight of ethoxyethyl-2-cyanoacrylate was prepared. The durometer hardness after curing of this coating agent was set to 70. The finishing operation was the same as in Example 1.
[Example 3]
A cyanoacrylate composition containing 20 parts by weight of sulfur dioxide, 100 parts by weight of hydroquinone, 10 parts by weight of polymethyl methacrylate, and 30 parts by weight of dioctyl phthalate with respect to 100 parts by weight of ethyl-2-cyanoacrylate It was adjusted. The durometer hardness after curing of this coating agent was set to 70. The finishing operation was the same as in Example 1.
[Example 4]
Using the composition of Example 1, it was applied to the surface of the shaped article 2 and cured using a trade name “Arteco Spray Primer” of Arteco as a curing accelerator. The finishing operation was the same as in Example 1.
[Example 5]
The finish-finished shaped product of Example 4 was painted with an acrylic paint.

[Comparative Example 1]
The finishing work of the model 1 was not performed.
[Comparative Example 2]
As a polishing operation for the surface of the modeled article 1, the laminated paper was changed from coarse to fine as # 400 → # 1000 → # 3000 → # 8000, and the laminated line was shaved to finish it smoothly.
[Comparative Example 3]
No finishing work was performed on the shaped object 3.
[Comparative Example 4]
As a finishing work, acetone was applied to the surface of the shaped article 3 with a brush. After 10 minutes, it was confirmed that it was naturally dried, and polishing work was performed. In the polishing operation, the abrasive paper was changed from coarse to fine, # 400 → # 1000 → # 3000 → # 8000, and the laminated line was shaved to finish it smoothly.
[Comparative Example 5]
The model 2 was painted with acrylic paint without polishing.

  As is apparent from Table 1, when the cyanoacrylate composition was used as a coating agent (Examples 1 to 5), as compared with the case without the coating agent, the unevenness of the molded article disappeared and the appearance was very good. Further, if the stacking pitch is made finer (Comparative Example 3) in order to obtain a molded article having an excellent aesthetic appearance, it costs much more than using a coating agent, and the aesthetic appearance does not reach.

  The coating agent and the method for creating a 3D model according to the present invention are useful for improving the efficiency of creating a model with a 3D printer and improving the aesthetics of the model.

1: coating agent, 10: brush, 20: curing accelerator, 30: capillary nozzle, 100: 3D model, D: scratch (crack), F: filler, L: laminated wire, P: laminated pitch, R: Hot-melt resin, S: gap

Claims (6)

A 3D printer is formed by discharging a heat-soluble resin with a 3D printer and three-dimensionally laminating at a predetermined lamination pitch.
Applying a coating agent mainly composed of 2-cyanoacrylic acid ester to the surface of the formed 3D shaped article so that the coating agent is infiltrated and filled in the gaps of the heat-soluble resin laminated,
Curing the coating agent applied so as to be softer than the laminated heat-soluble resin or the same hardness as the laminated heat-soluble resin,
A method of creating a 3D structure that fills a gap along a laminated line formed by the laminated heat-soluble resin by polishing the surface of the 3D structure after the coating agent is cured. The method for producing a 3D structure according to claim 1, wherein the lamination pitch is 0.1 mm or more and 0.5 mm or less, and the viscosity of the coating agent is 1 mPa · s or more and 100 mPa · s or less. The method for producing a 3D structure according to claim 2, wherein the coating agent is adjusted so that the durometer hardness after curing is 70% or more and 125% or less of the durometer hardness of the heat-soluble resin. A method for coating a 3D structure by applying a coating agent to the surface of a 3D structure formed by three-dimensionally laminating at a predetermined stacking pitch while discharging a heat-soluble resin with a 3D printer,
The coating agent is mainly composed of 2-cyanoacrylic acid ester,
Infiltrate the coating agent into the gaps between the laminated heat-soluble resins and fill it,
Curing the coating agent applied so as to be softer than the laminated heat-soluble resin or the same hardness as the laminated heat-soluble resin,
A method for coating a 3D structure that fills a gap along a laminated line formed by the laminated heat-soluble resin by polishing the surface of the 3D structure after the coating agent is cured. The method for coating a 3D structure according to claim 4, wherein the lamination pitch is 0.1 mm or more and 0.5 mm or less, and the viscosity of the coating agent is 1 mPa · s or more and 100 mPa · s or less. The method for coating a 3D structure according to claim 5, wherein the coating agent is adjusted so that a durometer hardness after curing is 70% or more and 125% or less of a durometer hardness of the heat-soluble resin.

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