Fiber-reinforced petg modified material for 3d printing and preparation method thereof

Abstract

The application discloses a kind of 3D printing with fiber reinforced PETG modified material and preparation method thereof, including the following weight parts of raw materials: PETG resin 50-96 parts, reinforcing fiber 3-30 parts, toughening agent 1-20 parts, melt stabilizer 0.2-1.5 parts, flow improver 0.2-2 parts, hydrolysis inhibitor 0-1 parts, lubricant 0.3-1.5 parts, antioxidant 0.1-1 parts;Each raw material is added in proportion and order, and the raw materials are melted, plasticized, mixed, extruded, cut into particles and dried in a twin-screw extruder at 190-230 DEG C to obtain a fiber-reinforced PETG modified material for 3D printing. When the modified material obtained by the application is used to draw 3D printing wire, the wire diameter stability is good, and higher quality 3D printing wire can be obtained.

Description

Technical Field

[0001] This invention relates to the field of 3D printing materials technology, and in particular to a fiber-reinforced PETG modified material for 3D printing and its preparation method. Background Technology

[0002] PETG (polyethylene terephthalate-1,4-cyclohexanedimethyl ester) is an amorphous copolyester with excellent transparency, heat resistance and impact resistance, and is inexpensive, making it a promising candidate for 3D printing FDM molding.

[0003] The mechanical strength of PETG materials reinforced with carbon fiber (CF) or glass fiber (GF) makes them suitable for engineering parts applications where high mechanical strength is required. Furthermore, 3D printing filaments made from fiber-reinforced PETG materials produce products with a strong matte finish, which is highly favored by customers.

[0004] In the field of 3D printing applications, current fiber-reinforced PETG materials suffer from low mechanical strength due to low fiber content, failing to meet the high mechanical strength requirements of engineering parts. Furthermore, issues such as poor wire diameter stability when drawing 3D printing filaments, low printing speed, and easy nozzle sticking limit the widespread application of fiber-reinforced PETG materials in 3D printing. Therefore, developing a fiber-reinforced PETG material that meets market application needs for 3D printing has become an urgent market demand. Summary of the Invention

[0005] To address the aforementioned problems in existing technologies, this invention provides a fiber-reinforced PETG modified material for 3D printing and its preparation method. This invention employs a suitable combination of toughening agents, melt stabilizers, and flow improvers, which not only ensures appropriate polymer melt flowability during material processing and guarantees uniform dispersion of reinforcing fibers in the PETG resin matrix, thus resolving the problems of nozzle clogging and surface defects in printed parts caused by uneven fiber dispersion in the resin matrix; but also, the modified material obtained by this invention exhibits good wire diameter stability when drawing 3D printing filaments, resulting in higher quality 3D printing filaments.

[0006] The technical solution of the present invention is as follows:

[0007] The first objective of this invention is to provide a fiber-reinforced PETG modified material for 3D printing, comprising the following raw materials in parts by weight:

[0008]

[0009]

[0010] In one embodiment of the present invention, the melt index (240°C, 2.16kg) of PETG resin is 2-30g / 10min.

[0011] In one embodiment of the present invention, the PETG resin is one of the following: WS-502 and WS-501N from Huahong Company, CR-5511 from China Resources Chemical Materials Company, GX-702 from Guoxin Jizhi New Materials Company, and K2012 from SK Chemicals Company.

[0012] In one embodiment of the present invention, the reinforcing fiber is one or more of carbon fiber and glass fiber.

[0013] Preferably, the reinforcing fiber is one or more of surface-modified carbon fiber and surface-modified glass fiber.

[0014] In one embodiment of the present invention, the reinforcing fiber is one of the following: CH70CP006-PEY, CH80CP006-PAY, CK70CP006-PUY from Amos Composites, T436H and T435N from Taishan Fiberglass, and FUY-110 from Nantong Fuyuan.

[0015] In one embodiment of the present invention, the toughening agent is one or more of the following: ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate-glycidyl methacrylate copolymer, ethylene-n-butyl acrylate-glycidyl methacrylate copolymer, methyl methacrylate-butadiene-styrene copolymer, ethylene-acrylate-maleic anhydride terpolymer, POE resin grafted with maleic anhydride copolymer, and POE resin grafted with glycidyl methacrylate copolymer.

[0016] Toughening agents can not only improve the impact toughness of fiber-reinforced PETG resin materials, but also the epoxy or anhydride active functional groups in the toughening agents can promote the dispersion of reinforcing fibers in the PETG resin matrix.

[0017] In one embodiment of the present invention, the melt stabilizer is one or more of oxazoline chain extenders, epoxy chain extenders, and styrene-methyl methacrylate-glycidyl methacrylate copolymers.

[0018] Melt stabilizers can effectively prevent the degradation of PETG resin during extrusion processing, thereby ensuring the stability of the polymer melt during processing.

[0019] In one embodiment of the present invention, the oxazoline chain extender is B1511 from TCI Shanghai Company.

[0020] In one embodiment of the present invention, the epoxy chain extender is one or more of BASF's ADR4468 and Jia Yi Rong's SG-20.

[0021] In one embodiment of the present invention, the styrene-methyl methacrylate-glycidyl methacrylate copolymer is one or more of KL-E4370 and KL-E4370B from Shanxi Chemical Research Institute.

[0022] In one embodiment of the present invention, the flow improver is a hyperbranched resin polymer, one or more of LYKX20 and LYKX200 from Shanghai Langzhen Industry.

[0023] In one embodiment of the present invention, the hyperbranched resin polymer is one or more of HyPer C100, HyPer C181, and HyPer C182 from Wuhan Hyperbranched Resin Technology Co., Ltd.

[0024] Flow improvers can enhance the melt flowability of polymers, improve the dispersion of fibers in the PETG resin matrix, and prevent fiber exposure. On the other hand, they can effectively increase the printing speed of fiber-reinforced PETG modified filaments during 3D printing.

[0025] In one embodiment of the present invention, the anti-hydrolysis agent is one or more of monomeric carbodiimide and polymeric carbodiimide.

[0026] In one embodiment of the present invention, the monomeric carbodiimide is HyMax1010 from Shanghai Langyi.

[0027] In one embodiment of the present invention, the polymeric carbodiimide is HyMax210 from Shanghai Langyi.

[0028] In one embodiment of the present invention, the lubricant is one or more of calcium stearate, pentaerythritol stearate, ethylene bis-stearamide, polyethylene wax, and copolysiloxane.

[0029] In one embodiment of the present invention, the copolysiloxane is SILIMER5140 from Chengdu Silike Company.

[0030] In one embodiment of the present invention, the antioxidant is one or more of antioxidant 1010, antioxidant 1076, antioxidant 1098, antioxidant 2246, and antioxidant 168.

[0031] A second objective of this invention is to provide a method for preparing the above-mentioned fiber-reinforced PETG modified material for 3D printing, comprising the following steps:

[0032] S1. Weigh out the raw materials PETG resin, toughening agent, melt stabilizer, flow improver, anti-hydrolysis agent, lubricant and antioxidant according to the proportion and add them to the high-speed mixer to mix and obtain the mixture raw material.

[0033] S2, add the mixture raw material obtained in step S1 into the main weighing hopper of the twin-screw extruder and into the main feed inlet of the twin-screw extruder; add the reinforcing fiber into the side weighing hopper and into the side feed inlet of the twin-screw extruder;

[0034] The S3 twin-screw extruder melts, plasticizes, mixes, extrudes, pelletizes, and dries the raw materials at 190-230℃ to obtain fiber-reinforced PETG modified materials for 3D printing.

[0035] In one embodiment of the present invention, in step S1, the mixing conditions are: mixing at a speed of 500-2000 rpm for 5-10 minutes.

[0036] A third objective of this invention is to provide an application of the aforementioned fiber-reinforced PETG modified material for 3D printing, specifically for use in 3D printing filaments.

[0037] The beneficial technical effects of this invention are as follows:

[0038] This invention uses a combination of suitable toughening agents, melt stabilizers, and flow improvers, which not only ensures that the polymer melt has suitable fluidity during material processing and guarantees the uniform dispersion of reinforcing fibers in the PETG resin matrix, but also solves the problems of nozzle clogging and surface floating of printed parts caused by uneven dispersion of fibers in the resin matrix. Furthermore, the modified material obtained by this invention has good wire diameter stability when drawing 3D printing filaments, resulting in higher quality 3D printing filaments.

[0039] The wire-printed products prepared by the modified material of this invention have high mechanical strength and modulus, making them very suitable for use in the field of printing engineering parts, and the surface of the printed parts has a good matte effect.

[0040] The fiber-reinforced PETG modified material for 3D printing obtained by this invention has good application effects in the field of 3D printing. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the embodiments.

[0042] Example 1

[0043] A fiber-reinforced PETG modified material for printing, the preparation method of which specifically includes the following steps:

[0044] Step S1: Weigh 50 parts of PETG resin (brand name WS-502, Huahong Company), 20 parts of ethylene-ethyl acrylate copolymer (brand name AC2116, DuPont Company), 1.5 parts of oxazoline chain extender (brand name B1511, TCI Shanghai Company), 2 parts of hyperbranched resin polymer (brand name HyPer C100, Wuhan Hyperbranched Resin Company), 0.5 parts of monomeric carbodiimide (brand name HyMax1010, Shanghai Langyi), 1.5 parts of calcium stearate, 0.5 parts of antioxidant 1010, and 0.5 parts of antioxidant 168 and add them to a high-speed mixer. Mix at 500 rpm for 10 minutes to obtain the mixture raw material.

[0045] Step S2: Add the mixture of raw materials to the main weighing hopper of the twin-screw extruder, and add the mixture of raw materials to the main feed inlet of the twin-screw extruder through the main weighing hopper; add 30 parts of surface-modified carbon fiber (grade CH70CP006-PEY, Amos Composites) to the side weighing hopper, and add the carbon fiber to the side feed inlet of the twin-screw extruder through the side weighing hopper; melt, plasticize, mix, extrude, pelletize and dry the raw materials in the twin-screw extruder at a temperature of 190℃~230℃ to obtain fiber-reinforced PETG modified material for 3D printing.

[0046] The 3D printing filament was prepared as follows for printing performance testing.

[0047] The obtained fiber-reinforced PETG modified material for 3D printing was added to a 3D printing filament extruder and melted and plasticized at a temperature of 190℃~220℃ to form 3D printing filament for printing tests. The filament diameter was 1.75mm.

[0048] Example 2

[0049] A fiber-reinforced PETG modified material for 3D printing, the preparation method of which specifically includes the following steps:

[0050] Step S1: Weigh 70 parts of PETG resin (brand name CR-5511, China Resources Chemical Materials Co., Ltd.), 5 parts of ethylene-methyl acrylate-glycidyl methacrylate copolymer (brand name AX8900, Arkema), 0.8 parts of epoxy chain extender (brand name ADR4468, BASF), 1 part of hyperbranched resin polymer (brand name HyPer C181, Wuhan Hyperbranched Resin Co., Ltd.), 1 part of monomeric carbodiimide (brand name HyMax1010, Shanghai Langyi), 1 part of pentaerythritol stearate, 0.4 parts of antioxidant 1098, and 0.4 parts of antioxidant 168 and add them to a high-speed mixer. Mix at 2000 rpm for 5 minutes to obtain the mixture raw material.

[0051] Step S2: Add the mixture of raw materials to the main weighing hopper of the twin-screw extruder, and add the mixture of raw materials to the main feed inlet of the twin-screw extruder through the main weighing hopper; add 25 parts of surface-modified glass fiber (grade T436H, Taishan Glass Fiber Co., Ltd.) to the side weighing hopper, and add the glass fiber to the side feed inlet of the twin-screw extruder through the side weighing hopper; melt, plasticize, mix, extrude, pelletize and dry the raw materials in the twin-screw extruder at a temperature of 190℃~230℃ to obtain fiber-reinforced PETG modified material for 3D printing.

[0052] The 3D printing filament was prepared as follows for printing performance testing.

[0053] The obtained fiber-reinforced PETG modified material for 3D printing was added to a 3D printing filament extruder and melted and plasticized at a temperature of 190℃~220℃ to form 3D printing filament for printing tests. The filament diameter was 1.75mm.

[0054] Example 3

[0055] A fiber-reinforced PETG modified material for 3D printing, the preparation method of which specifically includes the following steps:

[0056] Step S1: Weigh 79 parts of PETG resin (brand name WS-501N, Huahong Company), 1 part of ethylene-n-butyl acrylate-glycidyl methacrylate copolymer (brand name PTW, Dow Company), 0.5 parts of epoxy chain extender (brand name SG-20, Jiayirong Company), 0.5 parts of hyperbranched resin polymer (brand name HyPer C182, Wuhan Hyperbranched Resin Company), 0.2 parts of polymeric carbodiimide (brand name HyMax210, Shanghai Langyi), 0.4 parts of ethylene bis-stearamide, 0.4 parts of copolymer polysiloxane (brand name SILIMER5140, Chengdu Silike Company), and 0.6 parts of antioxidant 2246 and add them to a high-speed mixer. Mix at 1500 rpm for 8 minutes to obtain the mixture raw material.

[0057] Step S2: Add the mixture of raw materials to the main weighing hopper of the twin-screw extruder, and add the mixture of raw materials to the main feed inlet of the twin-screw extruder through the main weighing hopper; add 10 parts of surface-modified glass fiber (brand name T435N, Taishan Glass Fiber Co., Ltd.) and 10 parts of surface-modified carbon fiber (brand name CH80CP006-PAY, Amos Composites Co., Ltd.) to the side weighing hoppers respectively, and add the two types of fibers to the side feed inlet of the twin-screw extruder through the side weighing hoppers respectively. The twin-screw extruder melts, plasticizes, mixes, extrudes, pelletizes and dries the raw materials at a temperature of 190℃~230℃ to obtain fiber-reinforced PETG modified material for 3D printing.

[0058] The 3D printing filament was prepared as follows for printing performance testing.

[0059] The obtained fiber-reinforced PETG modified material for 3D printing was added to a 3D printing filament extruder and melted and plasticized at a temperature of 190℃~220℃ to form 3D printing filament for printing tests. The filament diameter was 1.75mm.

[0060] Example 4

[0061] A fiber-reinforced PETG modified material for 3D printing, the preparation method of which specifically includes the following steps:

[0062] Step S1: Weigh 96 parts of PETG resin (brand name GX-702, Guoxin Jizhi New Materials Co., Ltd.), 1 part of methyl methacrylate-butadiene-styrene copolymer (brand name C-223A, Mitsubishi Chemical), 0.2 parts of styrene-methyl methacrylate-glycidyl methacrylate copolymer (brand name KL-E4370, Shanxi Provincial Chemical Research Institute), 0.2 parts of flow improver (brand name LYKX20, Shanghai Langzhen Industrial Co., Ltd.), 0.3 parts of polyethylene wax, and 0.1 parts of antioxidant 1076 and add them to a high-speed mixer. Mix at 1000 rpm for 7 minutes to obtain the mixed raw material.

[0063] Step S2: Add the mixture of raw materials to the main weighing hopper of the twin-screw extruder, and add the mixture of raw materials to the main feed inlet of the twin-screw extruder through the main weighing hopper; add 3 parts of surface-modified carbon fiber (brand name CK70CP006-PUY, Amos Composites) to the side weighing hopper, and add the carbon fiber to the side feed inlet of the twin-screw extruder through the side weighing hopper; melt, plasticize, mix, extrude, pelletize and dry the raw materials in the twin-screw extruder at a temperature of 190℃~230℃ to obtain fiber-reinforced PETG modified material for 3D printing.

[0064] The 3D printing filament was prepared as follows for printing performance testing.

[0065] The obtained fiber-reinforced PETG modified material for 3D printing was added to a 3D printing filament extruder and melted and plasticized at a temperature of 190℃~220℃ to form 3D printing filament for printing tests. The filament diameter was 1.75mm.

[0066] Example 5

[0067] A fiber-reinforced PETG modified material for 3D printing, the preparation method of which specifically includes the following steps:

[0068] Step S1: Weigh 73 parts of PETG resin (brand name K2012, SK Chemicals), 1 part of ethylene-acrylate-maleic anhydride terpolymer (brand name BT-468, Nanjing Baitong Company), 1 part of POE resin grafted maleic anhydride copolymer (brand name FB521A, Jiayirong Company), 0.4 parts of styrene-methyl methacrylate-glycidyl methacrylate copolymer (brand name KL-E4370B, Shanxi Provincial Chemical Research Institute), 0.4 parts of flow improver (brand name LYKX200, Shanghai Langzhen Industrial Company), 0.5 parts of ethylene bis-stearamide, and 0.5 parts of antioxidant 2246 and add them to a high-speed mixer. Mix at 800 rpm for 9 minutes to obtain the mixed raw material.

[0069] Step S2: Add the mixture of raw materials to the main weighing hopper of the twin-screw extruder, and add the mixture of raw materials to the main feed inlet of the twin-screw extruder through the main weighing hopper; add 20 parts of surface-modified carbon fiber (brand name FUY-110, Nantong Fuyuan Company) to the side weighing hopper, and add the carbon fiber to the side feed inlet of the twin-screw extruder through the side weighing hopper; melt, plasticize, mix, extrude, pelletize and dry the raw materials in the twin-screw extruder at a temperature of 190℃~230℃ to obtain fiber-reinforced PETG modified material for 3D printing.

[0070] The 3D printing filament was prepared as follows for printing performance testing.

[0071] The obtained fiber-reinforced PETG modified material for 3D printing was added to a 3D printing filament extruder and melted and plasticized at a temperature of 190℃~220℃ to form 3D printing filament for printing tests. The filament diameter was 1.75mm.

[0072] Comparative Example 1

[0073] A fiber-reinforced PETG modified material for 3D printing, the preparation method of which specifically includes the following steps:

[0074] Step S1: Weigh 73 parts of PETG resin (brand name K2012, SK Chemicals), 1 part of ethylene-acrylate-maleic anhydride terpolymer (brand name BT-468, Nanjing Baitong Company), 1 part of POE resin grafted maleic anhydride copolymer (brand name FB521A, Jiayirong Company), 0.4 parts of flow improver (brand name LYKX200, Shanghai Langzhen Industrial Company), 0.5 parts of ethylene bis-stearamide, and 0.5 parts of antioxidant 2246 and add them to a high-speed mixer. Mix at 800 rpm for 9 minutes to obtain the mixture raw material.

[0075] Step S2: Add the mixture of raw materials to the main weighing hopper of the twin-screw extruder, and add the mixture of raw materials to the main feed inlet of the twin-screw extruder through the main weighing hopper; add 20 parts of surface-modified carbon fiber (brand name FUY-110, Nantong Fuyuan Company) to the side weighing hopper, and add the carbon fiber to the side feed inlet of the twin-screw extruder through the side weighing hopper; melt, plasticize, mix, extrude, pelletize and dry the raw materials in the twin-screw extruder at a temperature of 190℃~230℃ to obtain fiber-reinforced PETG modified material for 3D printing.

[0076] The 3D printing filament was prepared as follows for printing performance testing.

[0077] The obtained fiber-reinforced PETG modified material for 3D printing was added to a 3D printing filament extruder and melted and plasticized at a temperature of 190℃~220℃ to form 3D printing filament for printing tests. The filament diameter was 1.75mm.

[0078] Comparative Example 2

[0079] A fiber-reinforced PETG modified material for 3D printing, the preparation method of which specifically includes the following steps:

[0080] Step S1: Weigh 73 parts of PETG resin (brand name K2012, SK Chemicals), 1 part of ethylene-acrylate-maleic anhydride terpolymer (brand name BT-468, Nanjing Baitong Company), 1 part of POE resin grafted maleic anhydride copolymer (brand name FB521A, Jia Yi Rong Company), 0.5 parts of ethylene bis-stearamide, and 0.5 parts of antioxidant 2246 and add them to a high-speed mixer. Mix at 800 rpm for 9 minutes to obtain the mixture raw material.

[0081] Step S2: Add the mixture of raw materials to the main weighing hopper of the twin-screw extruder, and add the mixture of raw materials to the main feed inlet of the twin-screw extruder through the main weighing hopper; add 20 parts of surface-modified carbon fiber (brand name FUY-110, Nantong Fuyuan Company) to the side weighing hopper, and add the carbon fiber to the side feed inlet of the twin-screw extruder through the side weighing hopper; melt, plasticize, mix, extrude, pelletize and dry the raw materials in the twin-screw extruder at a temperature of 190℃~230℃ to obtain fiber-reinforced PETG modified material for 3D printing.

[0082] The 3D printing filament was prepared as follows for printing performance testing.

[0083] The obtained fiber-reinforced PETG modified material for 3D printing was added to a 3D printing filament extruder and melted and plasticized at a temperature of 190℃~220℃ to form 3D printing filament for printing tests. The filament diameter was 1.75mm.

[0084] Test example:

[0085] The standard for tensile strength testing is GB / T 1040.1-2006.

[0086] The standard for testing flexural strength and flexural modulus is GB / T 9341-2008.

[0087] Printing performance: Place the filament on the printer, print the product according to the model, visually inspect the smoothness of nozzle discharge and the presence of loose fibers on the outer surface of the printed product during the printing process, and evaluate the filament printing speed by printing a grid model.

[0088] The test results of the modified materials and filaments used in Examples 1-5 and Comparative Examples 1-2 are shown in Table 1.

[0089] Table 1

[0090]

[0091]

[0092] As can be seen from Table 1, the modified material not only has high mechanical strength and printing speed, but also has no floating fiber problem on the surface of the filament and the printed product, ensuring the stability of the filament printing performance and the quality of the product.

[0093] The embodiments provided above are not intended to limit the scope of the invention, nor are the described steps intended to limit the order of execution. Any obvious modifications made to the invention by those skilled in the art based on existing common knowledge also fall within the scope of protection defined by the claims.

Claims

1. A fiber-reinforced PETG modified material for 3D printing, characterized in that, The raw materials include the following parts by weight: 50-96 parts of PETG resin 20-30 parts of reinforcing fiber toughening agent 1-20 parts Melt stabilizer 0.2-1.5 parts Flow improver 0.2-2 parts 0-1 part of anti-hydrolysis agent 0.3-1.5 parts lubricant Antioxidant 0.1-1 part; Its preparation method includes the following steps: S1. Weigh out the raw materials PETG resin, toughening agent, melt stabilizer, flow improver, anti-hydrolysis agent, lubricant and antioxidant according to the proportion and add them to the high-speed mixer to mix and obtain the mixture raw material. The toughening agent is one or more of the following: ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate-glycidyl methacrylate copolymer, ethylene-n-butyl acrylate-glycidyl methacrylate copolymer, methyl methacrylate-butadiene-styrene copolymer, ethylene-acrylate-maleic anhydride terpolymer, POE resin grafted maleic anhydride copolymer, and POE resin grafted glycidyl methacrylate copolymer. S2, add the mixture raw material obtained in step S1 into the main weighing hopper of the twin-screw extruder and into the main feed inlet of the twin-screw extruder; add the reinforcing fiber into the side weighing hopper and into the side feed inlet of the twin-screw extruder; The S3 twin-screw extruder melts, plasticizes, mixes, extrudes, pelletizes, and dries the raw materials at 190-230℃ to obtain fiber-reinforced PETG modified materials for 3D printing. The melt stabilizer is one or more of TCI Shanghai's B1511 and Shanxi Provincial Chemical Research Institute's KL-E4370B. The flow improver is one or more of HyPer C100 from Wuhan Hyperbranched Resin Co., Ltd. and LYKX20 from Shanghai Langzhen Industry Co., Ltd.

2. The fiber-reinforced PETG modified material for 3D printing according to claim 1, characterized in that, The melt flow index of PETG resin is 2-30 g / 10 min.

3. The fiber-reinforced PETG modified material for 3D printing according to claim 1, characterized in that, The anti-hydrolysis agent is one or more of monomeric carbodiimide and polymeric carbodiimide; The lubricant is one or more of the following: calcium stearate, pentaerythritol stearate, ethylene bis-stearamide, polyethylene wax, and copolysiloxane. The antioxidant is one or more of antioxidant 1010, antioxidant 1076, antioxidant 1098, antioxidant 2246, and antioxidant 168.

4. A method for preparing the fiber-reinforced PETG modified material for 3D printing according to any one of claims 1-3, characterized in that, Includes the following steps: S1. Weigh out the raw materials PETG resin, toughening agent, melt stabilizer, flow improver, anti-hydrolysis agent, lubricant and antioxidant according to the proportion and add them to the high-speed mixer to mix and obtain the mixture raw material. S2, add the mixture raw material obtained in step S1 into the main weighing hopper of the twin-screw extruder and into the main feed inlet of the twin-screw extruder; add the reinforcing fiber into the side weighing hopper and into the side feed inlet of the twin-screw extruder; The S3 twin-screw extruder melts, plasticizes, mixes, extrudes, pelletizes, and dries the raw materials at 190-230℃ to obtain fiber-reinforced PETG modified materials for 3D printing.

5. The preparation method according to claim 4, characterized in that, In step S1, the mixing conditions are: mixing at a speed of 500-2000 rpm for 5-10 minutes.

6. The application of the fiber-reinforced PETG modified material for 3D printing according to any one of claims 1-3, characterized in that, Used for 3D printing filaments.

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