High-hardness and high-toughness TPU 3D printing consumable and production process thereof

Abstract

The invention relates to a TPU 3D printing consumable with high hardness and high toughness. The TPU 3D printing consumable comprises the following components in parts by weight: 70-95 parts of a TPU base material, 30-60 parts of MDI, 10-30 parts of polyester polyol, 10-30 parts of BDO, 5-20 parts of an auxiliary agent and 5-20 parts of an adhesive. The invention has the following beneficial effects: MDI can improve the hardness of consumables; the polyester polyol can improve the soft segment toughness and impact resistance of the consumable, so that knots and broken lines are prevented from being generated during 3D printing, and the printing quality is improved; the BDO can improve the hardness of the hard section of the consumable; the auxiliary agent can reduce the temperature of the consumables during processing, so that the energy consumption is reduced, and the processing is more convenient; the adhesive can improve the interlayer cohesiveness of the modified material in the processing process, so that the impact resistance of the consumable is improved; through blending modification, high transparency, low shrinkage, rapid curing and high impact resistance of the consumable can be realized, the consumable is not easy to deform (high hardness is maintained), the application range and stability of the product are improved, and the product can be recycled.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a TPU 3D printing consumable with high hardness and high toughness and a production process thereof. Background Art

[0002] Traditional 3D printing consumables are mainly PLA, ABS, PET, and low-hardness TPU. Among them, PLA has a low heat deformation temperature and poor impact resistance. It is generally not recycled due to its degradation performance, has high waste disposal costs, a narrow range of applications, and poor transparency after modification. ABS consumables emit odor during the printing process, and their shrinkage is too large, so they are generally not used for printing fine products. PET material has acceptable transparency, but the material is too brittle and has low impact resistance, so its application in 3D printed transparent products is limited. Although low-hardness TPU has good transparency and toughness, it has low hardness and poor shaping of 3D printed products. It is generally used for printing soles and uppers, and its scope is relatively limited.

[0003] Currently, there is a lack of 3D consumables in the market that have high hardness, good transparency, high heat deformation temperature, high impact resistance and high printing efficiency. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a TPU 3D printing consumable with high hardness and high toughness and a production process thereof to solve the above problems.

[0005] The technical solution of the present invention is implemented as follows: A TPU 3D printing consumable with high hardness and high toughness comprises the following components by weight: TPU base material 70-95 parts, MDI 30-60 parts, Polyester polyol 10-30 parts, BDO 10-30 parts, 5-20 parts of additives, Adhesive 5-20 parts.

[0006] The present invention is further configured as follows: the auxiliary agent comprises: Antioxidant 0.5-1 part, Anti-UV agent 0.1-1 part, Lubricant 1-10 parts.

[0007] The present invention is further configured such that: the lubricant is polyester wax.

[0008] The present invention is further configured as follows: the hardness of the TPU base material is 64D-80D.

[0009] By adopting the above technical solutions, MDI can improve the hardness of the consumables; polyester polyols can improve the toughness and impact resistance of the soft segment of the consumables, thereby preventing lumps and broken lines during 3D printing and improving printing quality; BDO ​​can improve the hardness of the hard segment of the consumables; additives can reduce the temperature of the consumables during processing, thereby reducing energy consumption and making processing more convenient; adhesives can improve the interlayer adhesion of the modified material during processing, thereby improving the impact resistance of the consumables; through blending modification, the consumables can achieve high transparency, low shrinkage, fast curing, high impact resistance and not easy to deform (maintain high hardness), which improves the application range and stability of the product and can be recycled.

[0010] A production process of a high-hardness and high-toughness TPU 3D printing consumables comprises the following steps: S1: Drying the TPU base material; S2: Fill the barrel of the granulation equipment with inert gas to fill the barrel; S3: Crush the dried TPU base material particles into fine particles and add them into the barrel, and add MDI, polyester polyol, BDO, additives and adhesives at the same time; S4: heating and stirring the mixed particles in the barrel for 10 min to 30 min; S5: Start the granulation equipment, heat and extrude the mixed particles after stirring to form a granulated mixture, and the heating temperature is 230°C; S6: leaving the granulated modified particles for 24h-72h; S7: putting the modified particles into a wire extrusion device for uniform extrusion, wherein the wire extrusion temperature is 230°C, the extrusion die diameter is set to 3mm-6mm, and the extrusion frequency is set to 30 Hz-50Hz; S8: Finally, TPU 3D printing filaments are obtained.

[0011] By adopting the above technical solution, drying the TPU base material first can avoid the molding effect of the mixed particles being affected by humidity; filling with inert gas can prevent the mixed particles from reacting with oxygen in the air during the stirring process, thereby ensuring the finished product effect of the modified particles; the contact surface of the crushed TPU base material is larger, the mixed contact is more uniform, and the fusion effect is better.

[0012] The present invention is further configured as follows: the barrel is installed on the granulation equipment, a stirring mechanism is provided inside the barrel, a refining feeding mechanism is installed on the outside of the barrel, and the refining feeding mechanism is used to break up the material and feed it into the barrel.

[0013] By adopting the above technical solution, the TPU base material is sent into the refining feeding mechanism to be crushed and refined first, and then sent into the barrel to be mixed and stirred with various materials. After refinement, the fusion effect between various materials is better, the mixing is more uniform, and the performance of the modified particles is effectively improved.

[0014] The present invention is further configured as follows: the refined feeding mechanism comprises: A shell, wherein a discharge port is provided at the upper end of the shell and is connected to the inside of the barrel through a feeding pipe, and an air inlet is provided on the shell; A crushing mechanism, the crushing mechanism is used to crush the fed materials; A rotating turbine, the rotating turbine comprising a bottom plate, a top plate and blades connected to the edge between the bottom plate and the top plate, the blades being arranged in a plurality of directions around the central axis of the bottom plate and the top plate, and a spacing being provided between adjacent blades, a lead-out port corresponding to the discharge port being provided at the center of the top plate, the top plate being rotationally connected to the discharge port of the housing through a sealed rotating bearing, and the rotating turbine being rotationally connected in the housing through a first motor; Wherein, the crushing mechanism is arranged in the rotating turbine.

[0015] By adopting the above technical solution, the rotating turbine is driven by the first motor to rotate in the outer shell. The rotating turbine will generate an upward airflow when rotating, thereby drawing the air in the outer shell into the rotating turbine and sending it out from the inlet port. At the same time, the material crushed by the crushing mechanism enters the rotating turbine, and the airflow blows the crushed material upward into the inlet port and sends it into the barrel through the feeding pipe.

[0016] The present invention is further configured as follows: the crushing mechanism comprises: A thinning turntable, wherein the outer wall of the thinning turntable is set in a conical shape, and blades are arranged on the outer wall of the thinning turntable around the central axis, and the upper end of the thinning turntable is connected to the second motor through a rotating shaft, and a feeding spiral is arranged on the outer wall of the rotating shaft along its length direction; A thinned upper cover, wherein the inner wall of the thinned upper cover is arranged in a conical shape, blades are arranged on the inner wall of the thinned upper cover around the central axis, and an opening is arranged at the upper end of the thinned upper cover; A feed pipe, the lower end of which is connected to the opening of the thinned upper cover, the upper end of which passes upward through the lead-out port, the discharge port, the feed pipe and extends to the outside of the feed pipe, and a feed port is provided on one side of the outer wall of the upper end of the feed pipe; A stabilizing shaft, wherein the stabilizing shaft is fixed at the upper center of the bottom plate, the upper end of the stabilizing shaft is rotatably connected to the lower side of the refinement turntable via a rotating bearing, and the stabilizing shaft, the bottom plate, and the refinement turntable are coaxially arranged; Among them, the thinning turntable is rotatably connected in the thinning upper cover and is coaxially arranged, a spacing is provided between the blades of the thinning turntable and the blades of the thinning upper cover and the spacing gradually decreases from top to bottom, and the rotating shaft is rotatably connected in the feed pipe and is coaxially arranged.

[0017] By adopting the above technical solution, the second motor drives the refinement turntable to rotate through the rotating shaft, and the material enters the feed pipe from the feed port. The blades on the refinement turntable cooperate with the blades in the refinement upper cover to crush and refine the material. As the distance between the refinement turntable and the refinement upper cover gradually decreases from top to bottom, the material is crushed by the blade and then falls down and continues to be crushed, gradually refined, until it falls out from the gap below the refinement turntable and the refinement upper cover, and then enters the rotating turbine and is driven up by the airflow; when the material enters the feed pipe from the feed port, the rotating rotating shaft can effectively drive the material to move down into the space between the refinement turntable and the refinement upper cover through the rotating feeding screw, thereby avoiding the accumulation and jamming of the material in the feed pipe; the stabilizing shaft can effectively improve the stability of the refinement turntable during rotation, and improve the crushing effect.

[0018] The present invention is further configured as follows: the refined feeding mechanism further comprises: A blower, wherein the air inlet of the blower is connected to the inside of the barrel, and the air outlet of the blower is respectively connected to the inside of the feed pipe and the air inlet; Wherein, a cooling mechanism is provided between the air outlet of the blower and the inside of the feed pipe.

[0019] By adopting the above technical scheme, the blower sends nitrogen into the air inlet and the inside of the feed pipe respectively. The nitrogen entering the air inlet is driven by the rotating turbine to enter the inside of the rotating turbine, thereby driving the crushed material into the feed pipe. At the same time, the nitrogen entering the inside of the feed pipe is first cooled by the cooling mechanism, so that the nitrogen entering the feed pipe is in a low temperature state. The cooled nitrogen enters between the refining turntable and the refining upper cover along with the material, and cools the material and the blade during the material being crushed, thereby avoiding the situation where the material melts and sticks due to the heat generated by the friction of the blade, effectively improving the crushing effect, making the refining effect better, and the material falls more smoothly in the refining turntable and the refining upper cover; then the nitrogen enters the barrel, so that the barrel is filled with nitrogen, so that when the barrel is stirred and mixed, it avoids reacting with oxygen in the air, thereby ensuring the finished product effect of the modified particles.

[0020] The present invention is further configured as follows: the stirring mechanism comprises: A main gear, the main gear is connected to a third motor, and the third motor is installed at the top of the barrel; A secondary gear, wherein a plurality of secondary gears are arranged circumferentially around the main gear, and a stirring shaft is fixedly connected to the lower side of the secondary gear; A gear ring, the gear ring is fixed to the upper end of the inner wall of the barrel, and the inner wall of the gear ring is provided with gear patterns; A baffle, the baffle is fixedly connected to the main gear and is located below the main gear, the stirring shaft passes through the baffle and is rotatably connected to the baffle, and a gap is provided between the edge of the baffle and the inner wall of the barrel; Wherein, the main gear and the sub-gear are both located in the gear ring, the main gear and the gear ring are coaxially arranged, the sub-gear is meshedly connected with the main gear and the gear ring at the same time, and the outer diameter of the main gear is greater than the outer diameter of the sub-gear.

[0021] By adopting the above technical solution, the third motor drives the main gear and the baffle plate to rotate, and the rotation of the main gear drives the sub-gear to rotate between the main gear and the gear ring. The sub-gear rotates along its own central axis and around the main gear, so that the stirring shaft on the sub-gear can rotate along its own central axis and around the center of the barrel, which effectively improves the stirring effect on the material and greatly improves the stirring performance; the baffle plate can effectively block the material splashing upward when the material is being stirred; since the outer diameter of the main gear is larger than the outer diameter of the sub-gear, when the main gear rotates one circle, it will drive the sub-gear to rotate multiple circles, thereby driving the stirring shaft to rotate quickly and improving the stirring effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a schematic diagram of the structure of the granulation equipment in the present invention; Figure 2 for Figure 1 The structural diagram of A in the figure; Figure 3 It is a schematic diagram of the matching structure of the refinement turntable and the refinement upper cover in the present invention; Figure 4 It is a structural schematic diagram of the stirring mechanism in the barrel of the present invention; Figure 5 It is a schematic diagram of the partial structure of the stirring mechanism in the present invention.

[0024] Figure numerals: 1. barrel; 2. granulation equipment; 3. refinement feeding mechanism; 30. shell; 300. discharge port; 301. air inlet; 31. feeding pipe; 32. rotating turbine; 320. bottom plate; 321. top plate; 3210. outlet; 322. fan blade; 323. first motor; 33. refinement turntable; 330. rotating shaft; 331. second motor; 332. unloading screw; 34. refinement upper cover; 35. feeding pipe; 350. feeding port; 36. stabilizing shaft; 4. blower; 5. cooling mechanism; 10. main gear; 100. third motor; 11. sub-gear; 110. stirring shaft; 12. gear ring; 13. baffle. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] like Figure 1-Figure 5 As shown, the present invention discloses a TPU 3D printing consumable with high hardness and high toughness, which comprises the following components by weight: TPU base material 70-95 parts, MDI 30-60 parts, Polyester polyol 10-30 parts, BDO 10-30 parts, 5-20 parts of additives, Adhesive 5-20 parts.

[0027] The present invention is further configured as follows: the auxiliary agent comprises: Antioxidant 0.5-1 part, Anti-UV agent 0.1-1 part, Lubricant 1-10 parts.

[0028] In an embodiment of the present invention, the lubricant is polyester wax.

[0029] In the embodiment of the present invention, the hardness of the TPU base material is 64D-80D.

[0030] By adopting the above technical solutions, MDI can improve the hardness of the consumables; polyester polyols can improve the toughness and impact resistance of the soft segment of the consumables, thereby preventing lumps and broken lines during 3D printing and improving printing quality; BDO ​​can improve the hardness of the hard segment of the consumables; additives can reduce the temperature of the consumables during processing, thereby reducing energy consumption and making processing more convenient; adhesives can improve the interlayer adhesion of the modified material during processing, thereby improving the impact resistance of the consumables; through blending modification, the consumables can achieve high transparency, low shrinkage, fast curing, high impact resistance and not easy to deform (maintain high hardness), which improves the application range and stability of the product and can be recycled.

[0031] In the embodiment of the present invention, the hardness of the TPU base material is 72D.

[0032] A production process of a high-hardness and high-toughness TPU 3D printing consumables comprises the following steps: S1: Drying the TPU base material; S2: Fill the barrel of the granulation equipment with inert gas to fill the barrel; S3: Crush the dried TPU base material particles into fine particles and add them into the barrel, and add MDI, polyester polyol, BDO, additives and adhesives at the same time; S4: heating and stirring the mixed particles in the barrel for 10 min to 30 min; S5: Start the granulation equipment, heat and extrude the mixed particles after stirring to form a granulated mixture, and the heating temperature is 230°C; S6: leaving the granulated modified particles for 24h-72h; S7: putting the modified particles into a wire extrusion device for uniform extrusion, wherein the wire extrusion temperature is 230°C, the extrusion die diameter is set to 3mm-6mm, and the extrusion frequency is set to 30 Hz-50Hz; S8: Finally, TPU 3D printing filaments are obtained.

[0033] By adopting the above technical solution, drying the TPU base material first can avoid the molding effect of the mixed particles being affected by humidity; filling with inert gas can prevent the mixed particles from reacting with oxygen in the air during the stirring process, thereby ensuring the finished product effect of the modified particles; the contact surface of the crushed TPU base material is larger, the mixed contact is more uniform, and the fusion effect is better.

[0034] In the embodiment of the present invention, the barrel 1 is installed on the granulation equipment 2, a stirring mechanism is provided inside the barrel 1, and a refining feeding mechanism 3 is installed on the outer side of the barrel 1, and the refining feeding mechanism 3 is used to crush the material and feed it into the barrel 1.

[0035] By adopting the above technical solution, the TPU base material is sent to the refining feeding mechanism 3 for crushing and refining first, and then sent to the barrel 1 for mixing and stirring with various materials. After refining, the fusion effect between various materials is better, the mixing is more uniform, and the performance of the modified particles is effectively improved.

[0036] In the embodiment of the present invention, the refinement feeding mechanism 3 comprises: A housing 30, wherein a discharge port 300 is provided at an upper end of the housing 30 and is connected to the interior of the barrel 1 through a feed pipe 31, and an air inlet 301 is provided on the housing 30; A crushing mechanism, the crushing mechanism is used to crush the fed materials; A rotating turbine 32, the rotating turbine 32 comprises a bottom plate 320, a top plate 321 and blades 322 connected to the edge between the bottom plate 320 and the top plate 321, the blades 322 are arranged in a plurality of directions around the central axis of the bottom plate 320 and the top plate 321, and a spacing is provided between adjacent blades 322, a lead-out port 3210 corresponding to and communicating with the discharge port 300 is provided at the center of the top plate 321, the top plate 321 is rotationally connected to the discharge port 300 of the housing 30 through a sealed rotating bearing, and the rotating turbine 32 is rotationally connected in the housing 30 through a first motor 323; The crushing mechanism is arranged in the rotating turbine 32 .

[0037] By adopting the above technical solution, the rotating turbine 32 is driven by the first motor 323 to rotate in the outer shell 30. The rotating turbine 32 will generate an upward airflow when rotating, so that the air in the outer shell 30 is drawn into the rotating turbine 32 and sent out from the outlet 3210. At the same time, the material crushed by the crushing mechanism enters the rotating turbine 32, and the airflow blows the crushed material upward into the outlet 3210 and sends it into the barrel 1 through the feeding pipe 31.

[0038] In an embodiment of the present invention, the crushing mechanism comprises: A thinning turntable 33, the outer wall of which is conical, and blades are arranged on the outer wall of the thinning turntable 33 around the central axis, the upper end of the thinning turntable 33 is connected to the second motor 331 through a rotating shaft 330, and a feeding screw 332 is arranged on the outer wall of the rotating shaft 330 along its length direction; A thinning upper cover 34, wherein the inner wall of the thinning upper cover 34 is arranged in a conical shape, blades are arranged on the inner wall of the thinning upper cover 34 around the central axis, and an opening is arranged at the upper end of the thinning upper cover 34; A feed pipe 35, the lower end of which is connected to the opening of the thinned upper cover 34, the upper end of which passes through the outlet 3210, the outlet 300, and the feed pipe 31 and extends to the outside of the feed pipe 31, and a feed port 350 is provided on one side of the outer wall of the upper end of the feed pipe 35; A stabilizing shaft 36, wherein the stabilizing shaft 36 is fixed at the upper center of the bottom plate 320, and the upper end of the stabilizing shaft 36 is rotatably connected to the lower side of the thinning turntable 33 via a rotating bearing, and the stabilizing shaft 36, the bottom plate 320, and the thinning turntable 33 are coaxially arranged; The thinning turntable 33 is rotatably connected in the thinning upper cover 34 and is coaxially arranged. There is a gap between the blades of the thinning turntable 33 and the blades of the thinning upper cover 34, and the gap gradually decreases from top to bottom. The rotating shaft 330 is rotatably connected in the feeding pipe 35 and is coaxially arranged.

[0039] By adopting the above technical solution, the second motor 331 drives the thinning turntable 33 to rotate through the rotating shaft 330, and the material enters the feed pipe 35 from the feed port 350. The blades on the thinning turntable 33 cooperate with the blades in the thinning upper cover 34 to break and refine the material. As the distance between the thinning turntable 33 and the thinning upper cover 34 gradually decreases from top to bottom, the material falls after being broken by the blades and then continues to be broken and gradually refined until it falls out from the gap below the thinning turntable 33 and the thinning upper cover 34, and then enters the rotating turbine 32 and is driven up by the airflow; when the material enters the feed pipe 35 from the feed port 350, the rotating rotating shaft 330 can effectively drive the material to move down and enter between the thinning turntable 33 and the thinning upper cover 34 through the rotating feeding screw 332, thereby avoiding the accumulation and jamming of the material in the feed pipe 35; the stabilizing shaft 36 can effectively improve the stability of the thinning turntable 33 during rotation and improve the breaking effect.

[0040] In the embodiment of the present invention, the refinement feeding mechanism 3 further comprises: The air blower 4 has an air inlet connected to the barrel 1, and an air outlet connected to the inside of the feed pipe 35 and the air inlet 301 respectively; Wherein, a cooling mechanism 5 is provided between the air outlet of the blower 4 and the inside of the feed pipe 35 .

[0041] By adopting the above technical solution, the blower 4 sends nitrogen into the air inlet 301 and the feed pipe 35 respectively. The nitrogen entering the air inlet 301 is driven by the rotating turbine 32 to enter the rotating turbine 32, thereby driving the crushed material into the feed pipe 31. At the same time, the nitrogen entering the feed pipe 35 is first cooled by the cooling mechanism 5, so that the nitrogen entering the feed pipe 35 is in a low temperature state. The cooled nitrogen enters between the refining turntable 33 and the refining upper cover 34 along with the material, and cools the material and the blade during the material being crushed, avoiding the heat generated by the friction of the blade causing the material to melt and stick, effectively improving the crushing effect, making the refining effect better, and the material falling in the refining turntable 33 and the refining upper cover 34 is smoother; then the nitrogen enters the barrel 1, so that the barrel 1 is filled with nitrogen, so that when the barrel 1 is stirred and mixed, it is avoided to react with oxygen in the air, thereby ensuring the finished product effect of the modified particles.

[0042] In an embodiment of the present invention, the stirring mechanism comprises: A main gear 10, wherein the main gear 10 is connected to a third motor 100, and the third motor 100 is installed at the top of the barrel 1; A secondary gear 11, wherein a plurality of secondary gears 11 are arranged circumferentially around the main gear 10, and a stirring shaft 110 is fixedly connected to the lower side of the secondary gear 11; A gear ring 12, wherein the gear ring 12 is fixed to the upper end of the inner wall of the barrel 1, and the inner wall of the gear ring 12 is provided with gear patterns; a baffle 13, wherein the baffle 13 is fixedly connected to the main gear 10 and is located below the main gear 10, the stirring shaft 110 passes through the baffle 13 and is rotatably connected to the baffle 13, and a gap is provided between the edge of the baffle 13 and the inner wall of the barrel 1; Among them, the main gear 10 and the sub-gear 11 are both located in the gear ring 12, the main gear 10 and the gear ring 12 are coaxially arranged, the sub-gear 11 is meshed and connected with the main gear 10 and the gear ring 12 at the same time, and the outer diameter of the main gear 10 is greater than the outer diameter of the sub-gear 11.

[0043] By adopting the above technical solution, the third motor 100 drives the main gear 10 and the baffle plate 13 to rotate. Through the rotation of the main gear 10, the sub-gear 11 is driven to rotate between the main gear 10 and the gear ring 12. The sub-gear 11 rotates along its own central axis and around the main gear 10, so that the stirring shaft 110 on the sub-gear 11 can rotate along its own central axis and around the center of the barrel 1, which effectively improves the stirring effect on the material and greatly improves the stirring performance; the baffle plate 13 can effectively block the material splashing upward when the material is being stirred; because the outer diameter of the main gear 10 is larger than the outer diameter of the sub-gear 11, when the main gear 10 rotates one circle, it will drive the sub-gear 11 to rotate multiple circles, thereby driving the stirring shaft 110 to rotate quickly, thereby improving the stirring effect.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-hardness and high-toughness TPU 3D printing consumables, characterized in that: The components include the following by weight: TPU base material 70-95 parts, MDI 30-60 parts, Polyester polyol 10-30 parts, BDO 10-30 parts, 5-20 parts of additives, Adhesive 5-20 parts.

2. The high-hardness and high-toughness TPU 3D printing consumable according to claim 1, characterized in that: The auxiliary agent includes: Antioxidant 0.5-1 part, Anti-UV agent 0.1-1 part, Lubricant 1-10 parts.

3. The high-hardness and high-toughness TPU 3D printing consumable according to claim 2, characterized in that: The lubricant is polyester wax.

4. The high-hardness and high-toughness TPU 3D printing consumable according to claim 1, characterized in that: The hardness of the TPU base material is 64D-80D.

5. A production process of high-hardness and high-toughness TPU 3D printing consumables, characterized in that: The steps include: S1: Drying the TPU base material; S2: Fill the barrel of the granulation equipment with inert gas to fill the barrel; S3: Crush the dried TPU base material particles into fine particles and add them into the barrel, and add MDI, polyester polyol, BDO, additives and adhesives at the same time; S4: heating and stirring the mixed particles in the barrel for 10 min to 30 min; S5: Start the granulation equipment, heat and extrude the mixed particles after stirring to form a granulated mixture, and the heating temperature is 230°C; S6: leaving the granulated modified particles for 24h-72h; S7: putting the modified particles into a wire extrusion device for uniform extrusion, wherein the wire extrusion temperature is 230°C, the extrusion die diameter is set to 3mm-6mm, and the extrusion frequency is set to 30 Hz-50Hz; S8: Finally, TPU 3D printing filaments are obtained.

6. The production process of a high-hardness and high-toughness TPU 3D printing consumable according to claim 5, characterized in that: The barrel (1) is mounted on the granulation equipment (2), a stirring mechanism is provided inside the barrel (1), and a refining feeding mechanism (3) is installed on the outside of the barrel (1), the refining feeding mechanism (3) is used to break up the material and feed it into the barrel (1).

7. The production process of a high-hardness and high-toughness TPU 3D printing consumable according to claim 6, characterized in that: The refinement feeding mechanism (3) comprises: A shell (30), wherein a discharge port (300) is provided at an upper end of the shell (30) and is in communication with the interior of the barrel (1) via a feed pipe (31), and an air inlet (301) is provided on the shell (30); A crushing mechanism, the crushing mechanism is used to crush the fed materials; A rotating turbine (32), the rotating turbine (32) comprising a bottom plate (320), a top plate (321), and blades (322) connected to the edge between the bottom plate (320) and the top plate (321), the blades (322) being arranged in a plurality of circumferential directions around the central axis of the bottom plate (320) and the top plate (321), a spacing being provided between adjacent blades (322), a guide outlet (3210) corresponding to and communicating with a discharge port (300) being provided at the center of the top plate (321), the top plate (321) being rotationally connected to the discharge port (300) of the housing (30) via a sealed rotating bearing, and the rotating turbine (32) being rotationally connected to the housing (30) via a first motor (323); Wherein, the crushing mechanism is arranged in the rotating turbine (32).

8. The production process of a high-hardness and high-toughness TPU 3D printing consumable according to claim 7, characterized in that: The crushing mechanism comprises: A thinning turntable (33), wherein the outer wall of the thinning turntable (33) is arranged in a conical shape, and blades are arranged on the outer wall of the thinning turntable (33) around the central axis, the upper end of the thinning turntable (33) is connected to the second motor (331) via a rotating shaft (330), and a feeding spiral (332) is arranged on the outer wall of the rotating shaft (330) along its length direction; A thinning upper cover (34), wherein the inner wall of the thinning upper cover (34) is arranged in a conical shape, blades are arranged on the inner wall of the thinning upper cover (34) around the central axis, and an opening is arranged at the upper end of the thinning upper cover (34); A feed pipe (35), the lower end of the feed pipe (35) being connected to the opening of the thinned upper cover (34), the upper end of the feed pipe (35) passing upward through the lead-out port (3210), the discharge port (300), and the feed pipe (31) and extending to the outside of the feed pipe (31), and a feed port (350) being provided on one side of an outer wall of the upper end of the feed pipe (35); A stabilizing shaft (36), the stabilizing shaft (36) being fixed at the center of the upper side of the bottom plate (320), the upper end of the stabilizing shaft (36) being rotatably connected to the lower side of the thinning turntable (33) via a rotating bearing, and the stabilizing shaft (36), the bottom plate (320), and the thinning turntable (33) being coaxially arranged; The thinning turntable (33) is rotatably connected in the thinning upper cover (34) and is coaxially arranged, a distance is provided between the blades of the thinning turntable (33) and the blades of the thinning upper cover (34), and the distance gradually decreases from top to bottom, and the rotating shaft (330) is rotatably connected in the feeding pipe (35) and is coaxially arranged.

9. The production process of a high-hardness and high-toughness TPU 3D printing consumable according to claim 8, characterized in that: The refined feeding mechanism (3) further comprises: A blower (4), wherein an air inlet of the blower (4) is connected to the inside of the barrel (1), and an air outlet of the blower (4) is respectively connected to the inside of the feed pipe (35) and the air inlet (301); Wherein, a cooling mechanism (5) is provided between the air outlet of the blower (4) and the inside of the feed pipe (35).

10. The production process of a high-hardness and high-toughness TPU 3D printing consumable according to claim 6, characterized in that: The stirring mechanism comprises: A main gear (10), the main gear (10) being connected to a third motor (100), the third motor (100) being mounted on the top of the barrel (1); A secondary gear (11), wherein a plurality of secondary gears (11) are arranged circumferentially around the main gear (10), and a stirring shaft (110) is fixedly connected to the lower side of the secondary gear (11); A gear ring (12), the gear ring (12) being fixed to the upper end of the inner wall of the barrel (1), and the inner wall of the gear ring (12) being provided with gear patterns; a baffle (13), the baffle (13) being fixedly connected to the main gear (10) and being located below the main gear (10), the stirring shaft (110) passing through the baffle (13) and being rotatably connected to the baffle (13), and a gap being provided between the edge of the baffle (13) and the inner wall of the barrel (1); The main gear (10) and the secondary gear (11) are both located in a gear ring (12); the main gear (10) and the gear ring (12) are coaxially arranged; the secondary gear (11) is meshingly connected to both the main gear (10) and the gear ring (12); and the outer diameter of the main gear (10) is greater than the outer diameter of the secondary gear (11).

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