Filament for three-dimensional laminate molding

Abstract

To provide a filament for three-dimensional laminate molding that has improved thermal stability within a nozzle.SOLUTION: The filament for three-dimensional laminate molding contains 0.5 parts by weight or more of a tin-based stabilizer per 100 parts by weight of polyvinyl chloride.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a filament for three-dimensional laminated modeling by a thermal melting lamination method that employs polyvinyl chloride (PVC) as a base material.

Background Art

[0002] As a lamination method of a three-dimensional printer, three-dimensional laminated modeling by a fused deposition modeling (FDM) method is known. In a three-dimensional laminated modeling apparatus using the FDM method, a filament made of a molten thermoplastic resin is sequentially laminated on a print bed from a hot end movable in a plane to produce a three-dimensional structure.

[0003] The hot end generally includes a guide, a nozzle, and a heater. The guide has a guide hole for guiding the filament, and the filament fed from the filament feeding device passes through the guide hole and enters the nozzle. A nozzle hole communicating with the guide hole is formed in the nozzle.

[0004] The filament feeding device feeds the filament into the guide hole with a predetermined feeding force. The filament fed into the guide hole reaches the nozzle hole and is melted by heating with a heater in the nozzle hole. The molten filament is discharged downward from the tip of the nozzle hole by the extrusion force of the unmelted filament sequentially fed into the nozzle hole.

[0005] It is known to use, for example, ABS resin, polylactic acid (PLA), and polyvinyl chloride (PVC) for the filament (Patent Documents 1 to 3).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] Nozzles of three-dimensional printers are widely made of metal. Among the above filament materials, polyvinyl chloride in particular easily adheres to the metal surface when melted. When performing three-dimensional printing of polyvinyl chloride using a metal nozzle, this "easy adhesion" increases the frictional resistance between the filament and the inner surface of the nozzle hole, reducing the flow rate of the filament and causing a part of the filament to stay in the nozzle hole. Then, the stuck filament burns and adheres to the nozzle hole, and there is a risk of nozzle clogging occurring, for example, within several minutes to about 60 minutes from the start of printing.

[0008] In the nozzle, burning and decomposition of the filament occur and progress, and there was a risk that nozzle clogging would occur and printing could not be continued when the printing time was long. Therefore, when polyvinyl chloride is used as a filament, three-dimensional printing for a long time may not be possible with a three-dimensional printer.

[0009] Therefore, an object of the present invention is to provide a filament for three-dimensional layer forming with improved thermal stability in a nozzle.

Means for Solving the Problems

[0010] The characteristic configuration of the filament for three-dimensional layer forming according to the present invention for achieving the above object is that it contains 0.5 parts by weight or more of a tin-based stabilizer with respect to 100 parts by weight of polyvinyl chloride.

[0011] In the following examples, it has been found that by setting the tin-based stabilizer to 0.5 parts by weight or more, the static thermal stability is improved. Therefore, according to this configuration, the thermal stability of the filament is improved, and it is possible to make it difficult for the filament to burn or decompose. As a result, three-dimensional laminated modeling using a polyvinyl chloride filament, which has been difficult to apply conventionally, can be easily performed.

[0012] A further characteristic configuration of the filament for three-dimensional laminated modeling according to the present invention is that it contains 4 parts by weight or more of a tin-based stabilizer with respect to 100 parts by weight of polyvinyl chloride.

[0013] In the following examples, it has been found that by setting the tin-based stabilizer to 4 parts by weight or more, the static thermal stability is significantly improved. Therefore, according to this configuration, the thermal stability of the filament is further improved, and it is possible to make it more difficult for the filament to burn or decompose. As a result, it becomes possible to provide a filament for three-dimensional laminated modeling that can achieve long-term modeling, for example, a continuous modeling time of 30 hours or more.

[0014] A further characteristic configuration of the filament for three-dimensional laminated modeling according to the present invention is that the tin-based stabilizer contains at least a liquid.

[0015] According to this configuration, since the liquid tin-based stabilizer has the properties of internal lubrication and external lubrication, an effect as a lubricant can also be expected. That is, it is possible to expect not only to reduce the viscosity during melt kneading, but also to improve the slipperiness between the material particles and the slipperiness between the material surface and the inner surface of the nozzle.

[0016] A further characteristic configuration of the filament for three-dimensional laminated modeling according to the present invention is that the tin-based stabilizer is a liquid.

[0017] According to this configuration, the tin-based stabilizer can be made of only a liquid. In the following examples, it has been found that by making the tin-based stabilizer of only a liquid, the static thermal stability is significantly improved.

[0018] A further characteristic configuration of the filament for three-dimensional laminated molding according to the present invention is that it contains 0.2 parts by weight or more of a lubricant.

[0019] According to this configuration, since the frictional resistance between the filament and the inner surface of the nozzle hole is further reduced, the time required for the filament to pass through the nozzle can be shortened, and it can be discharged from the nozzle before nozzle clogging due to burning and decomposition of the filament.

[0020] A further characteristic configuration of the filament for three-dimensional laminated molding according to the present invention is that it contains 2 parts by weight or more of chlorinated polyethylene.

[0021] Since the molded product by the three-dimensional printer has a laminated structure, when pulled in the lamination direction, it tries to withstand the tensile load by the tensile strength of the resin and the adhesive force between the laminations. However, since the difference between the tensile strength and the adhesive force is large (the adhesive force is about one fraction of the tensile strength), there is a risk that the laminations will peel off under a small tensile load. Therefore, when polyvinyl chloride is used as the filament, significant anisotropy (weak in tension in the lamination direction) may occur in the molded product by the three-dimensional printer.

[0022] In the examples described later, it has been found that by adding chlorinated polyethylene within this range, the tensile strength is improved. Therefore, by adding chlorinated polyethylene within this range as in this configuration, the adhesive force between the laminations can be improved. As a result, it becomes possible to provide a filament for three-dimensional laminated molding that can achieve a tensile strength (in the lamination direction) of 35 MPa or more of the molded product.

[0023] A further characteristic configuration of the filament for three-dimensional laminated molding according to the present invention is that the tin-based stabilizer is dimethyltin mercapto.

[0024] According to this configuration, since a commercially available tin-based stabilizer can be used, the present invention can be easily implemented.

[0025] A further characteristic configuration of the filament for three-dimensional laminated manufacturing according to the present invention lies in that the lubricant is a fatty acid ester.

[0026] According to this configuration, since commercially available lubricants can be used, the present invention can be easily implemented.

Embodiments for Carrying Out the Invention

[0027] Hereinafter, embodiments of the present invention will be described. The filament for three-dimensional laminated manufacturing of the present invention contains 0.5 parts by weight or more of a tin-based stabilizer with respect to 100 parts by weight of polyvinyl chloride.

[0028] In three-dimensional laminated manufacturing (three-dimensional printer), a molten filament made of a thermoplastic resin is sequentially laminated on a print bed from a hot end movable in a plane to produce a three-dimensional structure. In the present invention, polyvinyl chloride (PVC) is used as the filament.

[0029] Polyvinyl chloride has high versatility, excellent stability, is less expensive than ABS resin and PLA, and is effective in reducing manufacturing costs. As a commercially available product of polyvinyl chloride, for example, the product name "Kanevinyl S1006" (manufactured by Kaneka Corporation) can be used, but it is not limited thereto.

[0030] In the filament, so-called fillers (filler materials), stabilizers, plasticizers, and colorants can be blended as additives in order to obtain desired properties. In the present invention, a tin-based stabilizer is blended as an additive.

[0031] The tin-based stabilizer can reduce the viscosity during melt-kneading and facilitate the uniform mixing of each component. Examples of the tin-based stabilizer include, but are not limited to, dimethyltin mercapto, dibutyltin mercapto, dioctyltin mercapto, dibutyltin mercapto, dibutyltin maleate, dibutyltin maleate polymer, dioctyltin maleate, dioctyltin maleate polymer, dibutyltin laurate, and dibutyltin laurate polymer. These tin-based stabilizers may be used alone or in combination of two or more.

[0032] In this embodiment, the case of using dimethyltin mercapto as the tin-based stabilizer will be described. As a commercially available product of the tin-based stabilizer, for example, the product named "AT5300" (manufactured by Nitto Kasei Co., Ltd.) can be used, but it is not limited thereto.

[0033] The tin-based stabilizer can be used in a liquid or solid form. In this embodiment, the case where the tin-based stabilizer is in a liquid state will be described.

[0034] The tin-based stabilizer is set to 0.5 parts by weight or more with respect to 100 parts by weight of polyvinyl chloride. By adding the tin-based stabilizer within this range, the thermal stability of the filament can be improved. The tin-based stabilizer is preferably 4 parts by weight or more, more preferably 5 parts by weight or more, and even more preferably 8 parts by weight or more. The upper limit of the content of the tin-based stabilizer is not particularly limited, but it can be, for example, 16 parts by weight or less with respect to 100 parts by weight of polyvinyl chloride.

[0035] The filament for three-dimensional laminated molding of the present invention can be blended with a lubricant. The lubricant promotes the flow of the filament, reduces the frictional resistance between the filament and the inner surface of the nozzle, and can suppress the decrease in the flow rate of the filament near the inner surface of the nozzle.

[0036] Examples of lubricants include, but are not limited to, fatty acid esters, fatty acids, fatty alcohols, fatty alcohol esters, fatty acid amides, polyol esters, polyethylene wax, oxidized polyethylene wax, polypropylene wax, Fischer-Tropsch paraffin, paraffin wax, oligomer esters ("complex esters"), montanic acid esters, soaps, metal soaps of fatty acids, and metal soaps of montanic acid. These lubricants may be used alone or in combination of two or more.

[0037] In this embodiment, the case of using a fatty acid ester as the lubricant will be described. As a commercially available product of the lubricant, for example, the product name "EW-100" (manufactured by Riken Vitamin Co., Ltd.) can be used, but it is not limited thereto.

[0038] The lubricant is preferably 0.2 parts by weight or more based on 100 parts by weight of polyvinyl chloride. By adding a lubricant within this range, the time required for the filament to pass through the nozzle can be shortened, and it can be discharged from the nozzle before nozzle clogging due to burning and decomposition of the filament. Further, the lubricant is preferably 0.7 parts by weight or more, and more preferably 1.15 parts by weight or more. The upper limit of the content of the lubricant is not particularly limited, but it can be, for example, 3.8 parts by weight or less based on 100 parts by weight of polyvinyl chloride.

[0039] The filament for three-dimensional lamination molding of the present invention can be blended with chlorinated polyethylene (chlorinated PE). Chlorinated polyethylene is excellent in weather resistance, ozone resistance, and heat aging resistance because it has no double bond in the main chain.

[0040] As a commercially available product of chlorinated polyethylene, for example, the product name "CPE3516" (manufactured by Weihai Jinhong Polymer Co., Ltd.) can be used, but it is not limited thereto.

[0041] Chlorinated polyethylene is preferably added in an amount of 2 parts by weight or more based on 100 parts by weight of polyvinyl chloride. By adding chlorinated polyethylene within this range, the adhesion between layers can be improved. The upper limit of the content of chlorinated polyethylene is not particularly limited, and can be, for example, 12 parts by weight or less based on 100 parts by weight of polyvinyl chloride.

[0042] Also, chlorinated polyethylene is preferably added in an amount of 2 to 4 parts by weight.

[0043] The filament for three-dimensional laminated modeling of the present invention contains 0.5 part by weight or more of a tin-based stabilizer based on 100 parts by weight of polyvinyl chloride, so that the thermal stability of the filament is improved and the filament is less likely to burn or decompose. This makes it possible to easily perform three-dimensional laminated modeling using a polyvinyl chloride filament, which was conventionally difficult to apply.

[0044] Moreover, by setting the amount of the tin-based stabilizer to 4 parts by weight or more, the thermal stability of the filament can be further improved, and the filament is less likely to burn or decompose. This makes it possible to provide a filament for three-dimensional laminated modeling that can achieve a long molding time, for example, a continuous molding time of 30 hours or more.

Examples

[0045] 〔Outline of Examples〕 Hereinafter, the present invention will be further described with reference to examples. When producing a three-dimensional structure using a three-dimensional printer, the purpose generally falls into two cases: when only the shape of the three-dimensional structure is a problem and strength is not a problem (for example, when creating an experimental sample for shape confirmation), and when both the shape and strength of the three-dimensional structure are problems (for example, when creating a product for actual use). As long as the filament can form the desired shape, it can be used for at least the former purpose, and thus can be used as a filament for three-dimensional laminated modeling regardless of the strength of the resulting three-dimensional structure. The following Examples 1 to 3 are intended to evaluate whether or not molding is possible for each formulation example and comparative example.

[0046] However, when the obtained three-dimensional structure has sufficient strength, it can also be used for the latter purpose, so it can be said to be more preferable. The following Example 4 aims to evaluate whether each formulation example can exhibit strength that can be used in actual use on the premise that each is a moldable material.

[0047] 〔Example 1〕 Filaments for three-dimensional laminated molding were prepared by blending various additives with polyvinyl chloride, and their respective thermal stabilities were evaluated. As the polyvinyl chloride, Kanevinyll S1006 (manufactured by Kaneka Corporation) was used.

[0048] In Formulation Examples 1 to 4, a liquid tin-based stabilizer (AT5300 (manufactured by Nitto Kasei Co., Ltd.)), a solid tin-based stabilizer (TVS-8813 (manufactured by Nitto Kasei Co., Ltd.)), lubricants (EW100 (manufactured by Riken Vitamin Co., Ltd.) and AC-316A (manufactured by Honeywell International Inc.)), and chlorinated polyethylene (CPE3516: manufactured by Weihai Jinhong Polymer Co., Ltd.) were respectively blended.

[0049] Furthermore, in Formulation Examples 1 to 4, Ca stearate (NS-A: manufactured by Nitto Kasei Co., Ltd.), a processing aid (acrylic polymer PA40: manufactured by Kaneka Corporation), and an antioxidant (hindered phenol-based AO-60P: manufactured by ADEKA CORPORATION) were also blended. Table 1 shows the blending ratios (parts per hundred parts of rubber phr) of each additive with respect to 100 parts by weight of polyvinyl chloride.

[0050] Table 1: Formulation Examples 1 to 4 and Comparative Example 1

Table 1

[0051] On the one hand, in the conventional example, the above additives were not compounded, and a lead-based stabilizer (lead stearate), a reinforcing agent (methyl methacrylate-butadiene-styrene copolymer (MBS)), and an internal lubricant (polyethylene wax oxide) were compounded (Comparative Example 1).

[0052] The test method was carried out as follows. (1) Feed the filament into the nozzle heated to 220°C. (2) Hold the state where the nozzle is filled with the filament for a predetermined time (1 minute). (3) After the lapse of the predetermined time, take out the filament from the nozzle and check for any changes such as discoloration and charring.

[0053] The appearances of Formulation Examples 1 to 4 and Comparative Example 1 after the lapse of the predetermined time were evaluated. In Formulation Examples 2 and 3, no discoloration visible to the naked eye was observed. In Formulation Example 1, a very light discoloration of cream color (light yellow) was observed, and in Formulation Example 4, a light discoloration of beige color (bright light brown) was observed. In Comparative Example 1, a discoloration of fox color (light orange) occurred throughout the sample, and in some parts, a dark discoloration of brown was observed.

[0054] From this, it was recognized that by compounding a tin-based stabilizer (liquid, solid), the thermal stability (static thermal stability) of the filament was improved, and it was possible to make it difficult for the filament to burn and decompose. At this time, the tin-based stabilizer (liquid) was 0.5 to 5 parts by weight with respect to 100 parts by weight of polyvinyl chloride, and the tin-based stabilizer (solid) was 1 to 4 parts by weight with respect to 100 parts by weight of polyvinyl chloride.

[0055] In particular, it was found that by increasing the amount of the liquid tin-based stabilizer to 4 to 5 parts by weight, the static thermal stability was significantly improved. Since the liquid tin-based stabilizer has the properties of internal lubrication and external lubrication, an effect as a lubricant can also be expected. That is, it was considered that not only the viscosity during melt-kneading can be reduced, but also the slipperiness between the material particles can be improved, and the slipperiness between the material surface and the inner surface of the nozzle can be improved.

[0056] It has been found that the static thermal stability is improved by setting the amount of the solid tin-based stabilizer to 1 to 4 parts by weight. Although the solid tin-based stabilizer has the property of internal lubrication, it is considered that the slipperiness between the material particles deteriorates as the amount increases.

[0057] Taking the formulation example 3 (Example 3 of the present invention) in which the most improved stability (static thermal stability) was obtained as a benchmark, the following examples were conducted.

[0058] [Example 2] Formulation examples 5 to 13 were prepared by variously changing the addition amounts of various additives blended in formulation examples 1 to 4, and the thermal stability of each was evaluated. Table 2 shows the blending ratios of each additive with respect to 100 parts by weight of polyvinyl chloride.

[0059] Table 2: Formulation examples 5 to 13 [Table 2]

[0060] In formulation example 3, formulation examples 5 to 13, and comparative example 1, static thermal stability tests and dynamic thermal stability tests were conducted.

[0061] The static thermal stability test was conducted as follows. (1) Feed the filament into the nozzle heated to 240°C. (2) Hold the state where the nozzle is filled with the filament for a predetermined time (3 minutes). (3) After the elapse of the predetermined time, take out the filament from the nozzle and check for any changes such as discoloration and charring.

[0062] The dynamic thermal stability test was conducted as follows. (1) After heating the nozzle to 240°C, perform shaping for a predetermined time (90 minutes). (2) After the shaping is completed, take out the filament from the nozzle and check for any changes such as discoloration and charring.

[0063] Table 3 shows the results of evaluating the thermal stability (static thermal stability and dynamic thermal stability). These results were indicated as excellent (◎), slightly excellent (〇), equivalent (□), slightly inferior (△), inferior (×), unverifiable (××), when compared with Formulation Example 3. Regarding the degree of discoloration, even when it is slightly inferior (△), it is still fox-colored and no charring is observed, so it can be said that those with a thermal stability of slightly inferior (△) or more have a practically usable thermal stability. It was recognized that all of Formulation Examples 5 to 13 have a practically usable thermal stability.

[0064] Table 3: Static Thermal Stability Test and Dynamic Thermal Stability Test

Table 3

[0065] When the amount of the tin-based stabilizer (liquid) was increased (Formulation Example 5: 6 parts by weight, Formulation Example 6: 8 parts by weight), the char color became lighter in the static thermal stability test and an improvement in the static thermal stability was observed, but no change was seen in the results of the dynamic thermal stability test. Therefore, it was found that the tin-based stabilizer (liquid) should be 4 parts by weight or more, preferably 5 parts by weight or more, and more preferably 8 parts by weight or more.

[0066] Regarding chlorinated polyethylene, the increase or decrease thereof (Formulation Example 7: 0 parts by weight (no addition), Formulation Example 8: 4 parts by weight, Formulation Example 9: 6 parts by weight) had little effect on the static thermal stability and the dynamic thermal stability. In both of Formulation Examples 7 to 8, they showed a static thermal stability and a dynamic thermal stability equivalent to or slightly superior to that of Formulation Example 3.

[0067] Regarding the lubricant, the increase or decrease thereof (Formulation Example 10: 0.20 parts by weight, Formulation Example 11: 0.70 parts by weight, Formulation Example 12: 1.50 parts by weight, Formulation Example 13: 1.90 parts by weight) had little effect on the static thermal stability. In the dynamic thermal stability, when the amount of the lubricant was decreased (Formulation Example 10: 0.20 parts by weight, Formulation Example 11: 0.70 parts by weight), the char color became darker and a tendency for the dynamic thermal stability to decrease was observed. On the contrary, when the amount of the lubricant was increased (Formulation Example 12: 1.50 parts by weight, Formulation Example 13: 1.90 parts by weight), the char color became lighter and a tendency for the dynamic thermal stability to improve was observed.

[0068] Furthermore, the results of the thermal stability test in Comparative Example 1 were found to be "inferior" in terms of static thermal stability compared to Formulation Example 3, and the dynamic thermal stability was "unverifiable" because charring occurred.

[0069] [Example 3] In Formulation Example 3, Formulation Examples 5 to 13, and Comparative Example 1, a resin moldability test was conducted.

[0070] Using a three-dimensional printer (MF-2500EP II manufactured by Mutoh Industries), molding was performed for a predetermined time (180 minutes), and the presence or absence of defects (such as nozzle clogging, charring, cracking, and deformation of the molded object) during that time, as well as the degree of discoloration of the molded object and inside the nozzle, were confirmed. The nozzle temperature was set at 220°C.

[0071] In all of Formulation Example 3 and Formulation Examples 5 to 13, continuous molding for a predetermined time could be achieved without the occurrence of defects that would prevent further molding. On the other hand, in Comparative Example 1, charring occurred inside the nozzle at the 50-minute mark after the start of molding, and the molding could no longer be continued, so the test was terminated at that point. Therefore, for Comparative Example 1, a sample for evaluating the degree of discoloration could not be obtained.

[0072] The results of confirming the degree of discoloration of the molded object and inside the nozzle are shown in Table 4. The discoloration of the molded object and inside the nozzle was compared with that of Formulation Example 3 and indicated as excellent (◎), slightly good (〇), equivalent (□), slightly inferior (△), unverifiable (××). Even if the degree of discoloration is slightly inferior (△), the molded object is cream-colored and the inside of the nozzle is fox-colored, and since no defects are observed, it can be said that for levels of slightly inferior (△) and above, it has moldability that can be used in practical applications. All of Formulation Examples 5 to 13 were recognized as having moldability that can be used in practical applications.

[0073] Table 4: Moldability Test

Table 4

[0074] Examples of formulation 5 to 13 were all found to have practically sufficient formability. Among them, in Example of formulation 6 (8 parts by weight of tin-based stabilizer (liquid)), Example of formulation 9 (6 parts by weight of chlorinated polyethylene), Example of formulation 12 (1.50 parts by weight of lubricant), and Example of formulation 13 (1.90 parts by weight of lubricant), the formability was particularly good.

[0075] [Example 4] In Examples of formulation 3 and Examples of formulation 5 to 13, tensile strength tests were conducted. As described above, the tensile strength test is to refer to and evaluate whether each formulation can exhibit the strength that can be used in actual use on the premise that all of Examples of formulation 3 and Examples of formulation 5 to 13 used for the test are materials that can be formed. Therefore, regardless of the quality of the evaluation in Example 4, each formulation can be used at least for the purpose of forming.

[0076] The tensile strength test was conducted in the following two ways. (The first method) (1) A test piece with a predetermined shape (width 12 mm × thickness 5 mm × length 35 mm) (hereinafter referred to as an ultra-small test piece) is formed at a nozzle temperature of 240°C. (2) The test piece is pulled in the lamination direction at a predetermined speed (1 mm / min) with an autograph, and the breaking stress is measured (N = 4).

[0077] (The second method) (1) A test specimen (width 10 mm × thickness 5 mm × length 80 mm) formed with a three-dimensional printer (nozzle temperature 240°C) is processed into a test piece of Type A of the 1BA small test piece specified in JIS K 7161-1:2014 (hereinafter referred to as a small test piece). (2) The test piece is pulled in the lamination direction at a predetermined speed (5 mm / min) with an autograph, and the breaking stress is measured (N = 4).

[0078] The results of the tensile strength test are shown in Table 5. The values of the tensile strength are compared with those of Example of formulation 3 and are indicated as good (◎), slightly good (〇), equivalent (□), slightly inferior (△), and inferior (×). For formulations evaluated as slightly inferior (△) or more in both the ultra-small test piece and the small test piece, it is considered that they can exhibit the strength that can be used in actual use.

[0079] Table 5: Tensile Strength Test

Table 5

[0080] Regarding the tin-based stabilizer (liquid), it is recognized that in any of Formulation Examples 3 (5 parts by weight), 5 (6 parts by weight), and 6 (8 parts by weight), the strength sufficient for actual use can be exhibited.

[0081] Regarding chlorinated polyethylene, it was recognized that in Formulation Examples 3 (2 parts by weight) and 8 (4 parts by weight), the strength sufficient for actual use can be exhibited. On the other hand, in Formulation Examples 7 (0 part by weight) and 9 (6 parts by weight), although the strength that should avoid actual use was observed, it was confirmed that it can be used for applications where only the shape is a problem and the strength is not a problem (for example, experimental samples for shape confirmation).

[0082] Regarding the lubricant, when it was 0.70 part by weight or more (Formulation Examples 3 and 11 to 13), it was recognized that the strength sufficient for actual use can be exhibited. On the other hand, in Formulation Example 10 (0.20 part by weight), although the strength that should avoid actual use was observed, it was confirmed that it can be used for applications where only the shape is a problem and the strength is not a problem (for example, experimental samples for shape confirmation).

Industrial Applicability

[0083] The present invention can be used for a filament for three-dimensional laminated modeling by a heat fusion lamination method that employs polyvinyl chloride (PVC) as a base material.

Claims

1. A filament for three-dimensional laminated modeling, containing 0.5 parts by weight or more of a tin-based stabilizer with respect to 100 parts by weight of polyvinyl chloride.

2. The filament for three-dimensional laminated modeling according to Claim 1, containing 4 parts by weight or more of a tin-based stabilizer with respect to 100 parts by weight of polyvinyl chloride.

3. The filament for three-dimensional laminated modeling according to Claim 1 or 2, wherein the tin-based stabilizer contains at least a liquid.

4. The filament for three-dimensional laminated modeling according to Claim 3, wherein the tin-based stabilizer is a liquid.

5. The filament for three-dimensional laminated modeling according to Claim 1 or 2, containing 0.2 parts by weight or more of a lubricant.

6. The filament for three-dimensional laminated modeling according to Claim 1 or 2, containing 2 parts by weight or more of chlorinated polyethylene.

7. The filament for three-dimensional laminated modeling according to Claim 1 or 2, wherein the tin-based stabilizer is dimethyltin mercapto.

8. The filament for three-dimensional laminated modeling according to Claim 5, wherein the lubricant is a fatty acid ester.

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