CN116494524A - Method for producing fused deposition 3D printing wire by recycling thermoplastic polyurethane film - Google Patents
Method for producing fused deposition 3D printing wire by recycling thermoplastic polyurethane film Download PDFInfo
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- CN116494524A CN116494524A CN202310659757.0A CN202310659757A CN116494524A CN 116494524 A CN116494524 A CN 116494524A CN 202310659757 A CN202310659757 A CN 202310659757A CN 116494524 A CN116494524 A CN 116494524A
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- thermoplastic polyurethane
- polyurethane film
- fused deposition
- printing wire
- recycling
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- 239000004433 Thermoplastic polyurethane Substances 0.000 title claims abstract description 150
- 229920002803 thermoplastic polyurethane Polymers 0.000 title claims abstract description 150
- 238000010146 3D printing Methods 0.000 title claims abstract description 65
- 230000008021 deposition Effects 0.000 title claims abstract description 51
- 238000004064 recycling Methods 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000000465 moulding Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000005520 cutting process Methods 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 17
- 239000012634 fragment Substances 0.000 claims abstract description 15
- 238000001125 extrusion Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000011084 recovery Methods 0.000 abstract description 22
- 239000000463 material Substances 0.000 abstract description 18
- 239000000126 substance Substances 0.000 abstract description 9
- 239000002904 solvent Substances 0.000 abstract description 6
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 5
- 238000002360 preparation method Methods 0.000 abstract description 4
- 238000003672 processing method Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000009864 tensile test Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000007605 air drying Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000004970 Chain extender Substances 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/205—Means for applying layers
- B29C64/209—Heads; Nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/245—Platforms or substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
A method of recycling thermoplastic polyurethane film to produce a fused deposition 3D printing wire comprising: carrying out hot press molding treatment on the thermoplastic polyurethane film; cutting the compact thermoplastic polyurethane sheet after hot press molding to obtain particles or fragments of thermoplastic polyurethane; extruding and molding thermoplastic polyurethane particles or fragments into a fused deposition 3D printing wire rod, and producing and preparing the fused deposition 3D printing wire rod; the invention not only solves the difficult problem that the thermoplastic polyurethane film is loose and difficult to process, but also shortens the recovery flow of the thermoplastic polyurethane by using a physical and mechanical processing method, avoids using chemical solvents and reduces the loss of recovery materials, reagents and energy sources; the extrusion processing of the recycled thermoplastic polyurethane material is stabilized by utilizing the elasticity of the recycled thermoplastic polyurethane melt, and the high elasticity characteristic of the 3D printing part is maintained; the method realizes the production and preparation of the high-added-value fused deposition 3D printing wire rod by taking the low-cost thermoplastic polyurethane film as the raw material.
Description
Technical Field
The invention relates to the technical field of waste film treatment and fused deposition 3D printing wire rod preparation, in particular to a method for producing a fused deposition 3D printing wire rod by recycling a thermoplastic polyurethane film.
Background
Thermoplastic Polyurethane (TPU) films are widely applied to products such as mobile phone protective shells, raincoats, shower curtains, inflatable beds and the like, and the main components of the Thermoplastic Polyurethane (TPU) films are diisocyanate (hard chain segments) and block linear polymers with alcoholic hydroxyl linear polyesters or polyethers (soft chain segments) at two side end groups. Because of its high elasticity and air tightness, polyester fiber is widely used in various waterproof or inflatable elastic membrane materials.
At present, the thermoplastic polyurethane film is recovered mainly by adopting the same chemical recovery method as Polyurethane (PU), and the TPU is dissolved and degraded into a low molecular weight prepolymer or small molecules by using a chemical solvent. In the chemical recovery process, a large amount of chemical solvents and degradation reagents are used, and the recovered product is subjected to polymerization by adding a catalyst and a chain extender again to obtain TPU master batches, and then the TPU master batches are subjected to physical and mechanical processing to obtain the corresponding product.
Although the physical recycling method of thermoplastic polyurethane films has been receiving extensive attention in the industry, the physical recycling technology of TPU has not yet been mature. The physical recycling method is to directly process the TPU material into a product by physical methods such as cutting, hot melting and the like, and the elasticity of the recycled TPU melt is utilized to stabilize the extrusion processing of the recycled TPU material and keep the high elasticity characteristic of the TPU product. Compared with a chemical recovery method, the physical recovery method can shorten the TPU recovery flow, avoid using chemical solvents, reduce the loss of recovery materials, reagents and energy sources, but because the physical recovery technology of the thermoplastic polyurethane film is still in the primary research stage, compact melt is difficult to form, a recovery way with higher added value is lacking, and the thermoplastic polyurethane film is mostly treated in a landfill and incineration mode, so that the recovery rate is greatly reduced and certain pollution is generated to the environment.
Disclosure of Invention
The invention aims to solve the technical problems that the existing physical recovery technology for recovering the thermoplastic polyurethane film is difficult to form compact melt, lacks a recovery way with higher added value and has low recovery rate, and provides a method for producing a fused deposition 3D printing wire by recovering the thermoplastic polyurethane film.
The technical scheme adopted for solving the technical problems is as follows: a method of constructing a recycled thermoplastic polyurethane film to produce a fused deposition 3D printing wire, the method comprising:
step 1: carrying out hot press molding treatment on the thermoplastic polyurethane film to obtain a compact thermoplastic polyurethane sheet;
step 2: cutting the compact thermoplastic polyurethane sheet after hot press molding to obtain particles or fragments of thermoplastic polyurethane;
step 3: and extruding and molding the thermoplastic polyurethane particles or fragments generated after the cutting treatment to produce the fused deposition 3D printing wire.
Further, in the method for producing a fused deposition 3D printing wire by recycling a thermoplastic polyurethane film according to the present invention, when the hot press molding is performed in the step 1, the hot press temperature is 160 ℃ to 220 ℃, the molding pressure is 0.5MPa to 10MPa, and the pressure holding time is 0.5 minutes to 5 minutes.
Further, in the method for producing a fused deposition 3D printing wire by recycling a thermoplastic polyurethane film according to the present invention, the step 1 further comprises: before the thermoplastic polyurethane film is subjected to the hot press molding process, the thermoplastic polyurethane film is air-dried at 50 to 60 ℃ for 6 to 12 hours to reduce the water content thereof.
Further, in the method for producing the fused deposition 3D printing wire by recycling the thermoplastic polyurethane film, the step 2 specifically comprises the following steps: and (3) keeping the temperature of the cutting process below 50 ℃, and cutting the compact thermoplastic polyurethane sheet to obtain particles or fragments of thermoplastic polyurethane.
Further, in the method for producing the fused deposition 3D printing wire by recycling the thermoplastic polyurethane film, the step 3 specifically comprises: before the extrusion molding treatment of the thermoplastic polyurethane particles or chips, the thermoplastic polyurethane particles or chips are air-dried at 50 to 60 ℃ for 6 to 12 hours to reduce the water content thereof.
Further, in the method for producing a fused deposition 3D printing wire by recycling a thermoplastic polyurethane film according to the present invention, the dried thermoplastic polyurethane particles or chips are cooled to 50 ℃ or less in step 3 before extrusion molding.
Further, in the method for producing the fused deposition 3D printing wire by recycling the thermoplastic polyurethane film according to the present invention, the feeding temperature of the extruder in the step 3 is 20 ℃ to 50 ℃, the barrel temperature is 120 ℃ to 180 ℃, and the die temperature is 120 ℃ to 160 ℃.
Further, in the method for producing the fused deposition 3D printing wire by recycling the thermoplastic polyurethane film, the extruder in the step 3 is a single screw extruder, and the screw rotating speed is 40rpm to 60rpm.
Further, in the method for producing a fused deposition 3D printing wire by recovering a thermoplastic polyurethane film according to the present invention, if the thermoplastic polyurethane film satisfies the feeding condition, the hot press molding process in step 1 is not performed.
Further, in the method for producing a fused deposition 3D printing wire by recovering a thermoplastic polyurethane film according to the present invention, if the dense thermoplastic polyurethane sheet or thermoplastic polyurethane film satisfies the feeding condition of the extrusion molding of the 3D printing wire, the cutting process in the step 2 is not performed.
The method for producing the fused deposition 3D printing wire by recycling the thermoplastic polyurethane film has the following beneficial effects: the invention adopts the hot-press molding treatment process to recycle the thermoplastic polyurethane film, supplements the high-efficiency physical recycling technology required by recycling the thermoplastic polyurethane film, and overcomes the defect that a compact melt is difficult to form in recycling the thermoplastic polyurethane film; the extrusion processing of the recycled thermoplastic polyurethane material is stabilized by utilizing the elasticity of the recycled thermoplastic polyurethane melt, and the high elasticity characteristic of the 3D printing part is maintained; the invention shortens the recovery flow of the thermoplastic polyurethane U, avoids using chemical solvents, reduces the consumption of recovery materials, reagents and energy sources, realizes the production and preparation of the fused deposition 3D printing wire rod with high added value by taking the thermoplastic polyurethane film with low cost as a raw material, provides profit space for the recovery of the thermoplastic polyurethane film, improves the recovery rate of the thermoplastic polyurethane film, reduces the environmental pollution caused by the thermoplastic polyurethane film, and reduces the production cost of the fused deposition 3D printing wire rod produced by taking the recovered thermoplastic polyurethane film as the raw material while ensuring the high elasticity of the thermoplastic polyurethane material.
Drawings
For a clearer description of an embodiment of the invention or of a technical solution in the prior art, the drawings that are needed in the description of the embodiment or of the prior art will be briefly described, it being obvious that the drawings in the description below are only embodiments of the invention, and that other drawings can be obtained, without inventive effort, by a person skilled in the art from the drawings provided:
FIG. 1 is a flow chart of a method of the present invention for producing a fused deposition 3D printing wire from recycled thermoplastic polyurethane film;
FIG. 2 is a schematic drawing of a tensile test according to ISO 527-2/5A/500 standard for a 3D post-print recycled TPU material provided in example 1 of this invention;
FIG. 3 is a schematic drawing of a tensile fracture surface of a 3D printed article according to an embodiment of the present invention;
FIG. 4 is a schematic drawing of a tensile test according to ISO 527-2/5A/500 standard for a 3D post-print recycled TPU material provided in example 2 of this invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Exemplary embodiments of the present invention are illustrated in the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, and not limited to the technical solutions of the present application, and the embodiments of the present invention and the technical features in the embodiments may be combined with each other without conflict.
Aiming at the defects that the existing physical recycling technology for recycling the thermoplastic polyurethane film is difficult to form compact melt, lacks a recycling way with higher added value and is low in recycling rate, the invention provides a method for recycling the thermoplastic polyurethane film to produce a fused deposition 3D printing wire, and the invention provides a method for recycling the thermoplastic polyurethane film to produce the fused deposition 3D printing wire, and referring to fig. 1, the method comprises the following steps:
s1: and carrying out hot press molding treatment on the thermoplastic polyurethane film to obtain a compact thermoplastic polyurethane sheet (TPU sheet).
Preferably, before the recycled thermoplastic polyurethane film provided by the present invention is subjected to the hot press molding process, the thermoplastic polyurethane film is air-dried at 50 to 60 ℃ for 6 to 12 hours, reducing its water content. And carrying out hot press molding treatment on the dried thermoplastic polyurethane film, wherein the hot press temperature is 160-220 ℃, the molding pressure is 0.5-10 MPa, and the pressure holding time is 0.5-5 minutes. The molding temperature, pressure and holding time are selected to ensure that the thermoplastic polyurethane film can be hot-pressed into a relatively dense sheet.
Specifically, in the process of processing the compacted TPU sheet after hot press molding, the hot press molded sheet is cooled to below 50 ℃ by air cooling.
S2: cutting the compact thermoplastic polyurethane sheet after hot press molding to obtain particles or fragments of thermoplastic polyurethane;
preferably, the temperature of the cutting process is kept below 50 ℃, and the compact thermoplastic polyurethane sheet is subjected to cutting treatment to obtain particles or fragments of thermoplastic polyurethane.
S3: and extruding and molding the thermoplastic polyurethane particles or fragments generated after the cutting treatment to produce the fused deposition 3D printing wire.
Specifically, the extruder is a single screw extruder, and the screw speed is 40rpm to 60rpm. The feeding temperature of the extruder is 20-50 ℃, the temperature of the charging barrel is 120-180 ℃, and the temperature of the die is 120-160 ℃. The temperature range and the screw rotating speed are selected, so that the TPU in the thermoplastic polyurethane film can keep proper melt viscosity, and the thermoplastic polyurethane film is favorable for forming a fused deposition 3D printing wire.
The invention adopts the hot-press molding treatment process to recycle the thermoplastic polyurethane film, supplements the high-efficiency physical recycling technology required by recycling the thermoplastic polyurethane film, and overcomes the defect that a compact melt is difficult to form in recycling the thermoplastic polyurethane film; the extrusion processing of the recycled thermoplastic polyurethane material is stabilized by utilizing the elasticity of the recycled thermoplastic polyurethane melt, and the high elasticity characteristic of the 3D printing part is maintained; the invention shortens the recovery flow of the thermoplastic polyurethane U, avoids using chemical solvents, reduces the consumption of recovery materials, reagents and energy sources, realizes the production and preparation of the fused deposition 3D printing wire rod with high added value by taking the thermoplastic polyurethane film with low cost as a raw material, provides profit space for the recovery of the thermoplastic polyurethane film, improves the recovery rate of the thermoplastic polyurethane film, reduces the environmental pollution caused by the thermoplastic polyurethane film, and reduces the production cost of the fused deposition 3D printing wire rod produced by taking the recovered thermoplastic polyurethane film as the raw material while ensuring the high elasticity of the thermoplastic polyurethane material.
If the thermoplastic polyurethane film satisfies the feeding condition, the hot press molding treatment in the step S1 is not performed; if the densified thermoplastic polyurethane sheet or thermoplastic polyurethane film satisfies the feeding conditions for extrusion molding of the 3D printing wire, the cutting process in step S2 is not performed.
Two more specific examples are given below, table 1 discloses the main 3D printing parameter settings used in the examples.
TABLE 1 Primary 3D printing parameter settings
Example 1
The method for producing the fused deposition 3D printing wire by recycling the thermoplastic polyurethane film of the embodiment comprises the following steps:
step 1: air drying the thermoplastic polyurethane film at 60 ℃ for 12 hours;
step 2: carrying out hot press forming treatment on the dried thermoplastic polyurethane film, wherein the temperature of an upper plate and a lower plate of a hot press is set to 180 ℃, the hot press maintaining pressure is set to 5MPa, and the pressure maintaining time is set to 1 minute;
step 3: air cooling the compacted TPU sheet after hot pressing to 25 ℃;
step 4: the temperature in the cutting process is kept below 50 ℃, and the compact TPU sheet is cut to obtain TPU fragments with the size easy to feed;
step 5: extruding and molding TPU fragments by using a fused deposition 3D printing wire rod, wherein the feeding temperature of an extruder is 40 ℃, the temperature of a charging barrel is 145 ℃, the temperature of a die is 140 ℃, and the rotating speed of a screw rod is 60rpm;
step 6: cooling and winding the continuously extruded wire rod with the diameter of 1.75mm to obtain a fused deposition 3D printing wire rod;
step 7: the fused deposition 3D printing wire was subjected to 3D printing, and the tensile strength of the fused deposition 3D printing wire material produced using the recycled thermoplastic polyurethane film was measured to be 21MPa and the elongation at break was 1311% according to ISO 527-2/5A/500 standard.
Referring to FIG. 2, a schematic drawing of a tensile test of recycled TPU material according to ISO 527-2/5A/500 standard after 3D printing is provided in an embodiment of the present invention. Fig. 3 is a drawing of a 3D printed article according to an embodiment of the present invention, fig. 3 is a cross-sectional view of example 2, and (b) is an enlarged view of (a). According to the embodiment provided by the invention, the printing gap displayed by the stretching fracture surface of the 3D printing part is less, which shows that the 3D printing quality is higher, and the mechanical property of the 3D printing part is improved.
Example 2
The main difference between this example and example 1 except for the partial parameter sizes is that the thermoplastic polyurethane film of this example satisfies the feeding conditions, so that the hot press molding process is not required before cutting. Specifically, the method for producing the fused deposition 3D printing wire by recycling the thermoplastic polyurethane film of the embodiment comprises the following steps:
step 1: air drying the thermoplastic polyurethane film at 60 ℃ for 12 hours;
step 2: air cooling the dried TPU sheet to 25 ℃;
step 3: the temperature in the cutting process is kept below 50 ℃, and the TPU sheet is cut to obtain TPU fragments with the size easy to feed;
step 4: extruding and molding TPU fragments by using a fused deposition 3D printing wire rod, wherein the feeding temperature of an extruder is 40 ℃, the temperature of a charging barrel is 160 ℃, the temperature of a die is 155 ℃, and the rotating speed of a screw rod is 60rpm;
step 5: cooling and winding the continuously extruded wire rod with the diameter of 1.75mm to obtain a fused deposition 3D printing wire rod;
step 7: the fused deposition 3D printing wire was subjected to 3D printing, and the tensile strength of the fused deposition 3D printing wire material produced using the recycled thermoplastic polyurethane film was measured to be 17MPa and the elongation at break was measured to be 1208% according to ISO 527-2/5A/500.
Referring to FIG. 4, a schematic drawing of a tensile test according to ISO 527-2/5A/500 standard for a 3D post-print recycled TPU material provided in example 1 of this invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (10)
1. A method of recycling thermoplastic polyurethane film to produce a fused deposition 3D printing wire, the method comprising:
step 1: carrying out hot press molding treatment on the thermoplastic polyurethane film to obtain a compact thermoplastic polyurethane sheet;
step 2: cutting the compact thermoplastic polyurethane sheet after hot press molding to obtain particles or fragments of thermoplastic polyurethane;
step 3: and extruding and molding the thermoplastic polyurethane particles or fragments generated after the cutting treatment to produce the fused deposition 3D printing wire.
2. The method for producing a fused deposition 3D printing wire by recycling a thermoplastic polyurethane film according to claim 1, wherein the hot press molding is performed in step 1 at a hot press temperature of 160 ℃ to 220 ℃, a molding pressure of 0.5MPa to 10MPa, and a pressure holding time of 0.5 minutes to 5 minutes.
3. The method for producing a fused deposition 3D printing wire by recycling a thermoplastic polyurethane film according to claim 1, wherein the step 1 further comprises: before the thermoplastic polyurethane film is subjected to the hot press molding process, the thermoplastic polyurethane film is air-dried at 50 to 60 ℃ for 6 to 12 hours to reduce the water content thereof.
4. The method for producing a fused deposition 3D printing wire by recycling thermoplastic polyurethane film according to claim 1, wherein the step 2 specifically comprises: and (3) keeping the temperature of the cutting process below 50 ℃, and cutting the compact thermoplastic polyurethane sheet to obtain particles or fragments of thermoplastic polyurethane.
5. The method for producing a fused deposition 3D printing wire by recycling a thermoplastic polyurethane film according to claim 1, wherein the step 3 further comprises: before the extrusion molding treatment of the thermoplastic polyurethane particles or chips, the thermoplastic polyurethane particles or chips are air-dried at 50 to 60 ℃ for 6 to 12 hours to reduce the water content thereof.
6. The method for producing a fused deposition 3D printing wire by recycling thermoplastic polyurethane film according to claim 5, wherein the dried thermoplastic polyurethane particles or chips are cooled to 50 ℃ or less before extrusion molding in the step 3.
7. The method for producing a fused deposition 3D printing wire by recycling a thermoplastic polyurethane film according to claim 1, wherein the feeding temperature of the extruder in the step 3 is 20 ℃ to 50 ℃, the barrel temperature is 120 ℃ to 180 ℃, and the die temperature is 120 ℃ to 160 ℃.
8. The method for producing a fused deposition 3D printing wire by recycling a thermoplastic polyurethane film according to claim 1, wherein the extruder in the step 3 is a single screw extruder, and the screw rotation speed is 40rpm to 60rpm.
9. The method for producing a fused deposition 3D printing wire by recycling a thermoplastic polyurethane film according to claim 1, wherein the hot press molding process in step 1 is not performed if the thermoplastic polyurethane film satisfies a feeding condition.
10. The method for producing a fused deposition 3D printing wire by recycling a thermoplastic polyurethane film according to claim 1, wherein the cutting process in step 2 is not performed if the dense thermoplastic polyurethane sheet or thermoplastic polyurethane film satisfies the feeding condition of the extrusion molding of the 3D printing wire.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310659757.0A CN116494524A (en) | 2023-06-06 | 2023-06-06 | Method for producing fused deposition 3D printing wire by recycling thermoplastic polyurethane film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310659757.0A CN116494524A (en) | 2023-06-06 | 2023-06-06 | Method for producing fused deposition 3D printing wire by recycling thermoplastic polyurethane film |
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| CN116494524A true CN116494524A (en) | 2023-07-28 |
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| CN202310659757.0A Pending CN116494524A (en) | 2023-06-06 | 2023-06-06 | Method for producing fused deposition 3D printing wire by recycling thermoplastic polyurethane film |
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- 2023-06-06 CN CN202310659757.0A patent/CN116494524A/en active Pending
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