Outdoor weather-resistant carbon-sequestration 3D printing wire rod and preparation method thereof

Abstract

The invention discloses an outdoor weather-resistant carbon sequestration 3D printing wire rod and a preparation method thereof, and the outdoor weather-resistant carbon sequestration 3D printing wire rod comprises the following components in parts by weight: 100 parts of a weather-resistant polymer matrix, 20-60 parts of a carbon sequestration filler, 5-15 parts of a weather-resistant auxiliary agent system, 5-10 parts of a wear-resistant reinforcing agent, and 3-8 parts of an interface compatilizer, the weather-proof auxiliary agent system is composed of 2-5 parts of an ultraviolet absorbent, 2-5 parts of a light stabilizer and 1-3 parts of an antioxidant. According to the invention, remarkable environmental protection benefits are realized, the wire becomes a carbon sink, a large amount of CO2 can be stored in each kilogram of the product, carbon emission in the whole life cycle is extremely low, excellent outdoor durability is realized, ultraviolet resistance is improved, a special matrix and an ultraviolet stabilizer cooperate, sunlight aging is resisted, and the cable does not fade or pulverize after being used for a long time, and has the advantages of high wear resistance, long service life and the like. Wear-resistant components are added, so that the coating is high in surface hardness and suitable for public places with large visitor flow.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new environmental materials and additive manufacturing technology, in particular to an outdoor weather-resistant carbon fixation 3D printing wire and a preparation method thereof. BACKGROUND

[0002] Green building materials and sustainable manufacturing technology have become a development priority. On the other hand, with the promotion of urban renewal and beautiful countryside construction, there is a strong demand for personalized and artistic outdoor facilities such as sculptures, pavilions and seats, and 3D printing technology provides a perfect solution. However, the existing technology has obvious shortcomings: first, traditional outdoor materials are not environmentally friendly: traditional outdoor materials such as cement and metal have high carbon emissions in the production process; second, ordinary 3D printing materials are not weather resistant: common PLA materials are prone to ultraviolet aging, embrittlement and degradation outdoors, and ABS has poor ultraviolet resistance and is prone to deformation; third, existing carbon fixation technologies are not combined with weather resistance: current carbon fixation technologies are mainly focused on the field of building materials and have not been combined with high-performance polymer modification and advanced additive manufacturing technology to produce environmentally friendly and durable products with complex structures.

[0003] Therefore, it is of great significance to develop a 3D printing material that combines permanent carbon fixation function and excellent outdoor durability for promoting green building and intelligent construction. SUMMARY

[0004] The purpose of the present application is to provide an outdoor weather-resistant carbon fixation 3D printing wire and a preparation method thereof to solve the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: an outdoor weather-resistant carbon fixation 3D printing wire, comprising the following components by weight: a weather-resistant polymer matrix 100 parts, a carbon fixation filler 20-60 parts, a weather-resistant additive system 5-15 parts, a wear-resistant reinforcing agent 5-10 parts, and an interfacial compatibility agent 3-8 parts, wherein the weather-resistant additive system is composed of 2-5 parts of an ultraviolet absorber, 2-5 parts of a light stabilizer, and 1-3 parts of an antioxidant.

[0006] Optionally, the weather-resistant polymer matrix is made of ASA resin or weather-resistant modified PETG, the carbon fixation filler is an industrial carbon fixation product treated by hydrophobicity, and the industrial carbon fixation product comprises 15-50 parts by weight of mineralized calcium carbonate or mineralized magnesium carbonate, and the surface of the industrial carbon fixation product is modified by a silane coupling agent for hydrophobic treatment.

[0007] Optionally, the wear-resistant reinforcing agent is made of short-cut glass fibers or wear-resistant polymer powder, the ultraviolet absorber is made of a benzotriazole ultraviolet absorber, and the light stabilizer is made of a hindered amine light stabilizer.

[0008] Optionally, the interface compatilizer is a graft copolymer matching the weather-resistant high polymer matrix, when the weather-resistant high polymer matrix is ASA resin, the interface compatilizer is maleic anhydride grafted ASA, when the weather-resistant high polymer matrix is weather-resistant modified PETG, the interface compatilizer is glycidyl methacrylate grafted PETG.

[0009] Optionally, a preparation method of the outdoor weather-resistant carbon fixation 3D printing wire, the preparation method is suitable for the outdoor weather-resistant carbon fixation 3D printing wire, and specifically includes the following preparation method. S1, hydrophobic treatment of carbon fixation filler: a silane coupling agent is prepared into an ethanol solution with a concentration of 0.5-1.5%, an industrial carbon fixation product is added, stirring is carried out at 70-90 DEG C, the stirring time is 2-3 h, and then drying is carried out at 110-120 DEG C, the water content is less than 0.5%, so that the hydrophobic treated carbon fixation filler is obtained; S2, premixing; the hydrophobic treated carbon fixation filler, the ultraviolet absorber, the light stabilizer, the antioxidant, the wear-resistant reinforcing agent, the interface compatilizer and the weather-resistant high polymer matrix obtained in the step S1 are put into a high-speed mixer at a speed of 1200-1500 rpm and a temperature of 55-70 DEG C, and mixing is carried out for 8-10 min, so that a premix is obtained; S3, melt blending and granulation: the premix of the step S2 is sent into a double-screw extruder, the extrusion temperature is controlled, when the weather-resistant high polymer matrix is ASA resin, the temperature interval is 220-260 DEG C, when the weather-resistant high polymer matrix is weather-resistant modified PETG, the temperature interval is 250-260 DEG C, the screw rotation speed is 200-300 rpm, and after extrusion, water cooling and granulation, a functional master batch is obtained; S4, wire forming: the functional master batch of the step S3 is sent into a single-screw extruder, the plasticizing temperature is controlled, the ASA-based master batch is 220-240 DEG C, the PETG-based master batch is 240-250 DEG C, the extrusion is carried out through a wire special die, water bath cooling, traction and winding are carried out, and an outdoor weather-resistant carbon fixation 3D printing wire is obtained.

[0010] Optionally, the stirring paddle of the high-speed mixer in the step S2 is a paddle stirring paddle, and nitrogen protection is adopted in the mixing process to prevent weather-resistant additives from being oxidized at high temperature.

[0011] Optionally, the 3D printing wire is printed and prepared into outdoor public facilities through a fused deposition modeling 3D printer, and the outdoor public facilities include outdoor sculptures, pavilion components, seats, railings and signboards.

[0012] Compared with the prior art, the present application has the following beneficial effects: The present application realizes significant environmental benefits, the wire itself becomes a carbon sink, can store a large amount of CO2 per kilogram of product, the carbon emission of the whole life cycle is extremely low, realizes excellent outdoor durability, improves the resistance to ultraviolet rays, the special base body and the ultraviolet stabilizer cooperate, resist the sunlight aging, do not fade and do not powder after long-term use, and have high wear resistance, add wear-resistant components, the surface hardness is high, are suitable for public places with large flow of people, and are hydrolysis resistant, the filler is treated by hydrophobic treatment, effectively resists rainwater and moisture erosion, has excellent mechanical properties and printing properties, the component design balances the strength, toughness and printing fluidity, has small warping and high success rate, and simultaneously realizes economy and customization, the carbon fixation filler is low in cost, and the material cost is reduced. Combined with the 3D printing technology, the artistic and personalized rapid manufacturing of park facilities can be realized. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0014] Embodiment one An outdoor weather-resistant carbon fixation 3D printing wire comprises the following components in parts by weight: a weather-resistant polymer base body 100, a carbon fixation filler 30, a light stabilizer 3, an antioxidant 1.5, a wear-resistant reinforcing agent 5, and an interface compatibility agent 5. The weather-resistant polymer base body is made of ASA resin. The carbon fixation filler is an industrial carbon fixation product treated by hydrophobic treatment. The industrial carbon fixation product comprises 30 parts by weight of mineralized calcium carbonate. The hydrophobic treatment adopts surface modification of the industrial carbon fixation product by a silane coupling agent. The wear-resistant reinforcing agent is made of chopped glass fiber. The light stabilizer is made of a hindered amine light stabilizer. The interface compatibility agent is a grafted copolymer matched with the weather-resistant polymer base body. When the weather-resistant polymer base body is ASA resin, the interface compatibility agent is maleic anhydride grafted ASA.

[0015] A preparation method of an outdoor weather-resistant carbon fixation 3D printing wire, which is suitable for the outdoor weather-resistant carbon fixation 3D printing wire and specifically comprises the following preparation method. S1, hydrophobic treatment of the carbon fixation filler: a silane coupling agent is prepared into an ethanol solution with a concentration of 0.8%, and then added to an industrial carbon fixation product. The mixture is stirred at 80 DEG C for 2 hours, and then dried at 110 DEG C. The water content is less than 0.5%, so that the hydrophobic treated carbon fixation filler is obtained.

[0016] S2. Premixing: According to the weight proportions, the hydrophobic carbon-fixing filler, light stabilizer, antioxidant, wear-resistant reinforcing agent, interface compatibilizer and weather-resistant polymer matrix obtained in step S1 are put into a high-speed mixer. The speed is 1200 rpm, the temperature is 60℃, and the mixing time is 9 min to obtain a premix. The agitator of the high-speed mixer is a paddle-type agitator. Nitrogen gas protection is used during the mixing process to prevent the weather-resistant additives from oxidizing at high temperature.

[0017] S3. Melt blending and granulation: The premix from step S2 is fed into a twin-screw extruder. The extrusion temperature is controlled. When the weather-resistant polymer matrix is ​​ASA resin, the temperature is 240℃ and the screw speed is 200-300rpm. After extrusion, water cooling, and pelletizing, functional masterbatch is obtained.

[0018] S4. Wire forming: The functional masterbatch from step S3 is fed into a single-screw extruder, and the plasticizing temperature is controlled at 240°C for ASA-based masterbatch. The wire is extruded through a special die, cooled in a water bath, drawn, and wound to obtain outdoor weather-resistant carbon-fixed 3D printing filament. The 3D printing filament is then used to print outdoor public facilities through a fused deposition modeling 3D printer. Outdoor public facilities include outdoor sculptures, pavilion components, seats, railings, and signs.

[0019] Example 1 was used for park sculptures. After 1000 hours of QUV accelerated aging test, the printed sculpture sample showed a color difference ΔE < 3, a strength retention rate > 85%, and significantly improved wear resistance.

[0020] Example 2 An outdoor weather-resistant carbon-fixed 3D printing filament, by weight, comprises the following components: 100 parts of weather-resistant polymer matrix, 40 parts of carbon-fixed filler, 8 parts of wear-resistant reinforcing agent, 6 parts of interface compatibilizer, 2 parts of ultraviolet absorber, and 1.5 parts of antioxidant. The weather-resistant polymer matrix is ​​made from weather-resistant modified PETG. The carbon-fixed filler is an industrial carbon-fixing product that has undergone hydrophobic treatment. The industrial carbon-fixing product includes 40 parts by weight of mineralized calcium carbonate. The hydrophobic treatment is performed by surface modification of the industrial carbon-fixing product using a silane coupling agent. The wear-resistant reinforcing agent is made from wear-resistant polymer powder. The ultraviolet absorber is made from benzotriazole ultraviolet absorber. When the weather-resistant polymer matrix is ​​weather-resistant modified PETG, the interface compatibilizer is glycidyl methacrylate-grafted PETG.

[0021] A method for preparing outdoor weather-resistant carbon-fixed 3D printing filament, applicable to outdoor weather-resistant carbon-fixed 3D printing filament, specifically including the following preparation method: S1. Hydrophobic treatment of carbon fixation filler: Prepare a 1% concentration ethanol solution of silane coupling agent, add industrial carbon fixation product, stir at 80℃ for 2.5h, and then dry at 120℃ with a moisture content of <0.5% to obtain the hydrophobic treated carbon fixation filler.

[0022] S2. Premixing: According to the weight proportions, the hydrophobic carbon-fixing filler, ultraviolet absorber, antioxidant, wear-resistant reinforcing agent, interface compatibilizer and weather-resistant polymer matrix obtained in step S1 are put into a high-speed mixer. The speed is 1400 rpm, the temperature is 65℃, and the mixing time is 10 min to obtain a premix. The agitator of the high-speed mixer is a paddle-type agitator. Nitrogen gas protection is used during the mixing process to prevent the weather-resistant additives from oxidizing at high temperature.

[0023] S3. Melt blending and granulation: The premix from step S2 is fed into a twin-screw extruder. The extrusion temperature is controlled. When the weather-resistant polymer matrix is ​​weather-resistant modified PETG, the temperature range is 250℃ and the screw speed is 260rpm. After extrusion, water cooling, and pelletizing, functional masterbatch is obtained.

[0024] S4. Wire forming: The functional masterbatch from step S3 is fed into a single-screw extruder, and the plasticizing temperature is controlled at 250°C for PETG-based masterbatch. The filament is extruded through a special wire die, cooled in a water bath, drawn, and wound to obtain an outdoor weather-resistant carbon-fixed 3D printing filament. The 3D printing filament is then used to print outdoor public facilities using a fused deposition modeling 3D printer. Outdoor public facilities include outdoor sculptures, pavilion components, seats, railings, and signs.

[0025] Example 2 is used for outdoor seating. The product has high toughness, weather resistance and sufficient load-bearing strength, making it very suitable for outdoor furniture applications.

[0026] Example 3 An outdoor weather-resistant carbon-fixed 3D printing filament, by weight, comprises the following components: 100 parts weather-resistant polymer matrix, 40 parts carbon-fixed filler, 8 parts wear-resistant reinforcing agent, 7 parts interface compatibilizer, 4 parts ultraviolet absorber, 3 parts light stabilizer, and 2 parts antioxidant. The weather-resistant polymer matrix is ​​made of ASA resin. The carbon-fixed filler is an industrial carbon-fixing product that has undergone hydrophobic treatment. The industrial carbon-fixing product includes 35 parts by weight of mineralized calcium carbonate. The hydrophobic treatment is performed by surface modification of the industrial carbon-fixing product using a silane coupling agent. The wear-resistant reinforcing agent is made of chopped glass fiber. The ultraviolet absorber is made of benzotriazole ultraviolet absorber. The light stabilizer is made of hindered amine light stabilizer. The interface compatibilizer is a graft copolymer that matches the weather-resistant polymer matrix. When the weather-resistant polymer matrix is ​​ASA resin, the interface compatibilizer is maleic anhydride grafted ASA.

[0027] A method for preparing outdoor weather-resistant carbon-fixed 3D printing filament, applicable to outdoor weather-resistant carbon-fixed 3D printing filament, specifically including the following preparation method: S1. Hydrophobic treatment of carbon fixation filler: Prepare a 1.2% concentration ethanol solution of silane coupling agent, add industrial carbon fixation product, stir at 80℃ for 2.5h, and then dry at 120℃ with a moisture content of <0.5% to obtain the hydrophobic treated carbon fixation filler.

[0028] S2. Premixing: According to the weight proportions, the hydrophobic carbon-fixing filler, ultraviolet absorber, light stabilizer, antioxidant, wear-resistant reinforcing agent, interface compatibilizer and weather-resistant polymer matrix obtained in step S1 are put into a high-speed mixer. The speed is 1500 rpm, the temperature is 70℃, and the mixing time is 10 min to obtain a premix. The agitator of the high-speed mixer is a paddle-type agitator. Nitrogen gas protection is used during the mixing process to prevent the weather-resistant additives from oxidizing at high temperature.

[0029] S3. Melt blending and granulation: The premix from step S2 is fed into a twin-screw extruder. The extrusion temperature is controlled. When the weather-resistant polymer matrix is ​​ASA resin, the temperature range is 240℃ and the screw speed is 250rpm. After extrusion, water cooling, and pelletizing, functional masterbatch is obtained.

[0030] S4. Wire forming: The functional masterbatch from step S3 is fed into a single-screw extruder, and the plasticizing temperature is controlled at 235°C for ASA-based masterbatch. The wire is extruded through a special die, cooled in a water bath, drawn, and wound to obtain outdoor weather-resistant carbon-fixed 3D printing filament. The 3D printing filament is then used to print outdoor public facilities through a fused deposition modeling 3D printer. Outdoor public facilities include outdoor sculptures, pavilion components, seats, railings, and signs.

[0031] Example 3 is used for outdoor railings. The printed railing test pieces were tested for performance: after 1000 hours of QUV accelerated aging test, the color difference ΔE=2.6, the tensile strength retention rate was 88%, and the bending strength retention rate was 89%. It has both high load-bearing strength and environmental benefits, and there is no deformation or powdering after long-term outdoor use.

[0032] Example 4 An outdoor weather-resistant carbon-fixed 3D printing filament, by weight, comprises the following components: 100 parts of weather-resistant polymer matrix, 50 parts of carbon-fixed filler, 9 parts of abrasion-resistant reinforcing agent, 8 parts of interface compatibilizer, 5 parts of ultraviolet absorber, 3 parts of light stabilizer, and 2.5 parts of antioxidant. The weather-resistant polymer matrix is ​​made from weather-resistant modified PETG. The carbon-fixed filler is an industrial carbon-fixing product that has undergone hydrophobic treatment. The industrial carbon-fixing product includes 45 parts by weight of mineralized magnesium carbonate. The hydrophobic treatment is performed by surface modification of the industrial carbon-fixing product using a silane coupling agent. The abrasion-resistant reinforcing agent is made from abrasion-resistant polymer powder. The ultraviolet absorber is made from benzotriazole ultraviolet absorbers. The light stabilizer is made from hindered amine light stabilizers. The interface compatibilizer is a graft copolymer that matches the weather-resistant polymer matrix. When the weather-resistant polymer matrix is ​​weather-resistant modified PETG, the interface compatibilizer is glycidyl methacrylate grafted PETG.

[0033] A method for preparing outdoor weather-resistant carbon-fixed 3D printing filament, applicable to outdoor weather-resistant carbon-fixed 3D printing filament, specifically including the following preparation method: S1. Hydrophobic treatment of carbon-fixed filler: Prepare a 1.5% concentration ethanol solution of silane coupling agent, add industrial carbon-fixing product, stir at 85℃ for 2.5h, and then dry at 115℃ with a moisture content of <0.5%, thereby obtaining the hydrophobic treated carbon-fixed filler.

[0034] S2. Premixing: According to the weight proportions, the hydrophobic carbon-fixing filler, ultraviolet absorber, light stabilizer, antioxidant, wear-resistant reinforcing agent, interface compatibilizer and weather-resistant polymer matrix obtained in step S1 are put into a high-speed mixer. The speed is 1300 rpm, the temperature is 65℃, and the mixing time is 9 min to obtain a premix. The agitator of the high-speed mixer is a paddle-type agitator. Nitrogen gas protection is used during the mixing process to prevent the weather-resistant additives from oxidizing at high temperature.

[0035] S3. Melt blending and granulation: The premixed material from step S2 is fed into a twin-screw extruder. The extrusion temperature is controlled. When the weather-resistant polymer matrix is ​​weather-resistant modified PETG, the temperature range is 255℃ and the screw speed is 285rpm. After extrusion, water cooling, and pelletizing, functional masterbatch is obtained.

[0036] S4. Wire forming: The functional masterbatch from step S3 is fed into a single-screw extruder, and the plasticizing temperature is controlled at 245°C for PETG-based masterbatch. The filament is extruded through a special wire die, cooled in a water bath, drawn, and wound to obtain outdoor weather-resistant carbon-fixed 3D printing filament. The 3D printing filament is then used to print outdoor public facilities through a fused deposition modeling 3D printer. Outdoor public facilities include outdoor sculptures, pavilion components, seats, railings, and signs.

[0037] Example 4 is used for outdoor pavilion panels. The printed pavilion panel test pieces were tested for performance: after 1000 hours of QUV accelerated aging test, the color difference ΔE=2.8 and the tensile strength retention rate was 86%. It is suitable for outdoor scenes where pavilion panels are in long-term contact with rain and moisture, and the panel has good toughness and is impact-resistant without cracking.

[0038] The following table compares carbon sequestration amounts:

[0039] This table focuses on the core environmental indicator of wire, carbon sequestration. The data shows that Examples 1-4, by adding hydrophobically treated industrial carbon sequestration products, all achieved effective carbon sequestration of 128-198 gCO2 / kg. Comparison Groups 1 and 2 had no carbon sequestration ability. Although Comparison Group 3 added carbon sequestration filler, it was not hydrophobic, and the carbon sequestration was only 125 gCO2 / kg, which is slightly lower than Example 1 with the same filler dosage. This further confirms that the hydrophobic treatment process of the carbon sequestration filler in this invention does not affect its carbon sequestration function, while ensuring other performance.

[0040] The weather resistance comparison table is as follows:

[0041] This table focuses on the critical weather resistance performance of outdoor materials. Using QUV accelerated aging for 1000 hours to simulate outdoor UV and condensation cycles, the color difference ΔE was ≤2.9, and the tensile strength retention rate was ≥85%. Long-term outdoor use showed no fading or embrittlement. In contrast, group 1, lacking weather-resistant design, experienced a sharp increase in color difference to 15.6 and a strength retention rate of only 23.8% after aging. Group 3, due to the lack of hydrophobic filler, suffered a sharp drop in weather resistance because moisture easily penetrated. This highlights the crucial role of the hydrophobic treatment of the carbon-fixed filler and the synergistic effect of the weather-resistant additives in this invention.

[0042] The following table compares the wear resistance properties:

[0043] This table evaluates the scratch resistance of the wire surface using the Taber abrasion test, making it suitable for high-frequency outdoor contact scenarios. Examples 1-4, due to the addition of chopped glass fibers or abrasion-resistant polymer powder, have abrasion losses of only 17.2-20.1 mg, far lower than that of control group 1. Although control group 2 contains chopped glass fibers, it lacks the synergistic reinforcement of carbon-fixed filler, resulting in abrasion losses of 22.1 mg, slightly higher than the examples. Control group 3 has abrasion losses of 25.7 mg due to poor interfacial bonding caused by the non-hydrophobic filler. This further demonstrates the synergistic abrasion resistance effect of the abrasion-resistant reinforcing agent and the hydrophobic carbon-fixed filler in this invention.

[0044] The mechanical properties comparison table is as follows:

[0045] The tensile strength and flexural strength tested in this table are core indicators of the load-bearing capacity of outdoor facilities. Examples 1-4, due to the use of interface compatibilizers to match the matrix and carbon-fixed fillers, have tensile strengths of 39.8-45.1 MPa and flexural strengths of 58.5-70.2 MPa, meeting the requirements for outdoor use. Comparison group 1 has low mechanical strength and cannot bear loads. Comparison group 3, due to the non-hydrophobic filler and poor compatibility with the matrix, has a tensile strength of only 35.4 MPa and a flexural strength of 52.3 MPa, which are significantly lower than Example 1 with the same matrix, confirming the key influence of interface compatibilizers and hydrophobic treatment of fillers on mechanical properties.

[0046] The following is a comparison table of 3D printing performance:

[0047] This table focuses on the 3D printing adaptability of filaments. Fiber diameter tolerance affects printing accuracy, and warpage height affects the dimensional stability of the product. Examples 1-4, due to the use of premixed nitrogen protection and twin-screw precise temperature control, have a wire diameter tolerance of ≤±0.03mm. When printing 100×100×3mm samples, the warpage height is ≤0.4mm, ensuring the accuracy of the printed product dimensions. In contrast, the wire diameter tolerance of control group 1 is ±0.05mm, and the warpage height is 3.8mm, which is prone to printing failure. In control group 3, due to the non-hydrophobic filler and uneven mixing with the matrix, the warpage height is 0.8mm, which is higher than that of Example 1 with the same matrix. This further proves the role of the preparation process of this invention in ensuring the performance of 3D printing.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An outdoor weather-resistant carbon-fixed 3D printing filament, characterized in that, By weight, it comprises the following components: 100 parts of weather-resistant polymer matrix, 20-60 parts of carbon-fixing filler, 5-15 parts of weather-resistant additive system, 5-10 parts of wear-resistant reinforcing agent, and 3-8 parts of interface compatibilizer. The weather-resistant additive system consists of 2-5 parts of ultraviolet absorber, 2-5 parts of light stabilizer and 1-3 parts of antioxidant.

2. The outdoor weather-resistant carbon-fixed 3D printing filament according to claim 1, characterized in that: The weather-resistant polymer matrix is ​​made of ASA resin or weather-resistant modified PETG, and the carbon fixation filler is an industrial carbon fixation product that has been hydrophobically treated. The industrial carbon fixation product includes 15-50 parts by weight of mineralized calcium carbonate or mineralized magnesium carbonate. The hydrophobic treatment is performed by surface modification of the industrial carbon fixation product using a silane coupling agent.

3. The outdoor weather-resistant carbon-fixed 3D printing filament according to claim 2, characterized in that: The wear-resistant reinforcing agent is made from chopped glass fibers or wear-resistant polymer powder, the ultraviolet absorber is made from benzotriazole ultraviolet absorbers, and the light stabilizer is made from hindered amine light stabilizers.

4. The outdoor weather-resistant carbon-fixed 3D printing filament according to claim 3, characterized in that: The interface compatibilizer is a graft copolymer that matches the weather-resistant polymer matrix. When the weather-resistant polymer matrix is ​​ASA resin, the interface compatibilizer is maleic anhydride grafted ASA. When the weather-resistant polymer matrix is ​​weather-resistant modified PETG, the interface compatibilizer is glycidyl methacrylate grafted PETG.

5. A method for preparing an outdoor weather-resistant carbon-fixed 3D printing filament, characterized in that, The preparation method is applicable to the outdoor weather-resistant carbon-fixed 3D printing filament as described in any one of claims 1-4, and specifically includes the following preparation method: S1. Hydrophobic treatment of carbon fixation filler: Prepare a 0.5-1.5% concentration ethanol solution of silane coupling agent, add industrial carbon fixation product, stir at 70-90℃ for 2-3 hours, and then dry at 110-120℃ with a moisture content of <0.5% to obtain the hydrophobic treated carbon fixation filler. S2. Premixing: According to the weight parts, the hydrophobic carbon-fixing filler, ultraviolet absorber, light stabilizer, antioxidant, wear-resistant enhancer, interface compatibilizer and weather-resistant polymer matrix obtained in step S1 are put into a high-speed mixer at a speed of 1200-1500 rpm, a temperature of 55-70℃ and a mixing time of 8-10 min to obtain the premix. S3. Melt blending and granulation: The premix from step S2 is fed into a twin-screw extruder. The extrusion temperature is controlled. When the weather-resistant polymer matrix is ​​ASA resin, the temperature range is 220-260℃. When the weather-resistant polymer matrix is ​​weather-resistant modified PETG, the temperature range is 250-260℃. The screw speed is 200-300 rpm. After extrusion, water cooling, and pelletizing, functional masterbatch is obtained. S4. Wire forming: The functional masterbatch from step S3 is fed into a single-screw extruder. The plasticizing temperature is controlled at 220-240℃ for ASA-based masterbatch and 240-250℃ for PETG-based masterbatch. The wire is extruded through a special wire die, cooled in a water bath, drawn, and wound to obtain an outdoor weather-resistant carbon-fixed 3D printing filament.

6. The method for preparing the outdoor weather-resistant carbon-fixed 3D printing filament according to claim 5, characterized in that: In step S2, the high-speed mixer uses a paddle-type agitator, and nitrogen protection is used during the mixing process to prevent the weather-resistant additives from oxidizing at high temperatures.

7. The method for preparing the outdoor weather-resistant carbon-fixed 3D printing filament according to claim 5, characterized in that: Outdoor public facilities are manufactured by printing 3D filaments through a fused deposition modeling 3D printer. These outdoor public facilities include outdoor sculptures, pavilion components, seats, railings, and signs.

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