Conductive polyester material and preparation method thereof

Abstract

The invention provides a conductive polyester material and a preparation method thereof. Kelp is used as a biological template, a three-dimensional network structure is formed after soaking and water absorption, fibers expand and open the network structure, then plasma treatment is adopted, the fiber structure is further opened, the kelp is placed in a high-voltage electrostatic field, a cellulose solution is added, the opened fiber structure facilitates entering of the cellulose solution and winding of the cellulose solution and the original structure, and the kelp is obtained. A more dense network structure is formed inside, a strengthened kelp network structure is obtained after freeze drying, and a compact carbon nanotube layer is formed outside after carbon nanotube solution dipping and sintering, so that the mechanical strength of the conductive filler is improved, meanwhile, a compact conductive network structure is formed, the conductivity is increased, and the conductivity is improved. And the conductive performance can be greatly improved after the material is added into a polyester sheet.

Description

Technical Field

[0001] The invention relates to the field of polyester materials, and in particular to a conductive polyester material and a preparation method thereof. Background Art

[0002] Polyester material is a material with relatively comprehensive performance. It has good transparency and high gloss; it has good air tightness and fragrance retention. Compared with general materials, polyester material has better mechanical properties, better tensile strength and impact strength. Polyester material also has excellent resistance to weak acid and oil, and is non-toxic and has good stability against chemicals. Because of its many advantages, polyester material is used as a high-end packaging material for various textiles, precision instruments, and electrical components; it is the base material for audio tapes, video tapes, movie films, computer floppy disks, metal-plated films, and photosensitive films, and is also used in electronic and mechanical fields such as electrical insulation materials, capacitor films, and flexible printed circuit boards.

[0003] With the development of society and economy, the functional requirements for polyester materials are getting higher and higher, and conductivity is one of them. Therefore, it is an urgent problem to be solved by modifying polyester to improve its conductivity. Summary of the invention

[0003] Technical problem to be solved: The purpose of the present invention is to provide a conductive polyester material and a preparation method thereof, using kelp as a biological template, and forming a three-dimensional network structure after soaking and absorbing water. The fibers swell and open the network structure, and then plasma treatment is used to further open the fiber structure, and the fiber structure is placed in a high-voltage electrostatic field. A cellulose solution is added, and the opened fiber structure is conducive to the entry of the cellulose solution, which is entangled with the original structure to form a denser network structure inside. After freeze-drying, a reinforced kelp network structure is obtained, and then by impregnating a carbon nanotube solution, a dense carbon nanotube layer is formed on the outside after sintering, which not only increases the mechanical strength of the conductive filler, but also forms a dense conductive network structure, increases the conductivity, and can greatly improve the conductive performance after being added to the polyester sheet.

[0004] Technical solution: A conductive polyester material, comprising the following components by weight: 100 parts of polyester chips, 15-25 parts of conductive fillers, and 5-10 parts of tackifiers; The conductive filler is composed of an inner reinforced kelp network and an outer layer covered with dense carbon nanotubes. Furthermore, the preparation method of the conductive filler is as follows: Step 1: Take the kelp, clean it and soak it in water to absorb water for 6-8 hours; Step 2: taking out, draining the water, and placing in low-temperature plasma for treatment to obtain the treated kelp; Step 3: Add the treated kelp into the cellulose solution, stir for 1-2 hours and then place in a high voltage electrostatic field for treatment; Step 4: After taking out, wash with deionized water, freeze-dry, and obtain a reinforced kelp network; Step 5: crushing and passing through a 270-mesh sieve to obtain reinforced kelp network particles; Step 6: Immerse the reinforced kelp network particles in the carbon nanotube solution and stir for 20-40 minutes; Step 7: Dry in a vacuum oven; Step 8: Place in a tubular furnace for sintering to obtain a conductive filler. Furthermore, the low temperature plasma treatment conditions in step 2 are: treatment voltage 80-110 kV, treatment time 40-80 s. Furthermore, the concentration of the cellulose solution in step 3 is 4-9 wt.%. Furthermore, in step 3, the voltage of the high-voltage electrostatic field is 15-20 kV, the electric field distance is 15-20 cm, the electric field strength is 1000-1600 V / cm, and the treatment time is 10-16 h. Furthermore, in step 6, the carbon nanotube solution is a carbon nanotube polyvinyl alcohol solution, wherein the mass volume ratio of the carbon nanotubes, polyvinyl alcohol and water is (0.6-1) g:8 g:100 mL. Furthermore, in step 6, the mass ratio of the reinforced kelp network to the carbon nanotube solution is 2:(4-5). Furthermore, the sintering in step 8 is specifically as follows: nitrogen is introduced at a rate of 80 mL / s, the temperature is raised to 300°C at a rate of 7°C / min and then kept at that temperature for 30 minutes, then the temperature is raised to 1000-1200°C at a rate of 10°C / min and kept at that temperature for 2 hours, and then naturally cooled to room temperature. The preparation method of the above conductive polyester material has the following preparation steps: S1: Mix the polyester chips, the conductive filler and the tackifier in a blender to mix them evenly; S2: Place in an oven and dry at 150-170°C for 4-6 hours; S3: putting the dried material into an extruder for extrusion plasticization, and the heating temperature in the extruder is 260-265°C; S4: The plasticized material is molded and output to obtain a conductive polyester material. Furthermore, in step S4, the molding temperature is 255-265° C., the molding pressure is 20-30 MPa, and the molding time is 45 s. Beneficial effects: The present invention uses kelp as a biological template, and forms a three-dimensional network structure after soaking and absorbing water. The fibers swell and open the network structure, and then use plasma treatment to further open the fiber structure. The fiber is placed in a high-voltage electrostatic field, and a cellulose solution is added. The opened fiber structure is conducive to the entry of the cellulose solution, which is entangled with the original structure to form a denser network structure inside. After freeze-drying, a reinforced kelp network structure is obtained, and then a carbon nanotube solution is impregnated and a dense carbon nanotube layer is formed on the outside after sintering, which not only increases the mechanical strength of the conductive filler, but also forms a dense conductive network structure, increases the conductivity, and can greatly improve the conductive performance after being added to a polyester sheet. DETAILED DESCRIPTION The present invention proposes a conductive polyester material and a preparation method thereof. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention will be further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Example 1 A method for preparing a conductive polyester material, in parts by weight, the preparation steps are as follows: Step 1: Take kelp, clean it and soak it in water to absorb water for 7 hours; Step 2: Take out, drain the water, place in low-temperature plasma for treatment for 40 seconds, the low-temperature plasma treatment voltage is 110 kV, and obtain the treated kelp; Step 3: Take 5 portions of the treated kelp, add 8 portions of cellulose solution with a concentration of 8 wt.%, stir for 2 hours, and then place in a high-voltage electrostatic field for 15 hours, wherein the voltage of the high-voltage electrostatic field is 20 kV, the electric field distance is 18 cm, and the electric field strength is 1500 V / cm; Step 4: After taking out, wash with deionized water, freeze-dry, and obtain a reinforced kelp network; Step 5: crushing and passing through a 270-mesh sieve to obtain reinforced kelp network particles; Step 6: Take 8 g of polyvinyl alcohol and 100 mL of water, stir to dissolve, add 0.8 g of carbon nanotubes, and stir evenly to obtain a carbon nanotube polyvinyl alcohol solution; Step 7: immerse 2 parts of the reinforced kelp network particles in 5 parts of the carbon nanotube polyvinyl alcohol solution and stir for 30 minutes; Step 8: Dry in a vacuum oven; Step 9: Place in a tubular furnace for sintering, introduce nitrogen at a rate of 80 mL / s, heat to 300°C at a rate of 7°C / min and keep warm for 30 minutes, then heat to 1100°C at a rate of 10°C / min and keep warm for 2 hours, and cool naturally to room temperature to obtain a conductive filler; Step 10: Mix 100 parts of polyester chips, 20 parts of conductive fillers and 8 parts of tackifiers, stir in a blender and mix well; Step 11: Put in an oven and dry at a temperature of 160° C. for 6 hours; Step 12: Put the dried material into the extruder for extrusion plasticization, and the heating temperature in the extruder is 265°C; Step 13: The plasticized material is molded at a molding temperature of 265° C., a molding pressure of 25 MPa, and a molding time of 45 seconds to obtain a conductive polyester material. Example 2 A method for preparing a conductive polyester material, in parts by weight, the preparation steps are as follows: Step 1: Take kelp, clean it and soak it in water to absorb water for 7 hours; Step 2: Take out, drain the water, place in low-temperature plasma for treatment for 60 seconds, the low-temperature plasma treatment voltage is 110kV, and obtain the treated kelp; Step 3: Take 5 portions of the treated kelp, add 8 portions of cellulose solution with a concentration of 8 wt.%, stir for 2 hours, and then place in a high-voltage electrostatic field for 15 hours, wherein the voltage of the high-voltage electrostatic field is 20 kV, the electric field distance is 18 cm, and the electric field strength is 1500 V / cm; Step 4: After taking out, wash with deionized water, freeze-dry, and obtain a reinforced kelp network; Step 5: crushing and passing through a 270-mesh sieve to obtain reinforced kelp network particles; Step 6: Take 8 g of polyvinyl alcohol and 100 mL of water, stir to dissolve, add 0.8 g of carbon nanotubes, and stir evenly to obtain a carbon nanotube polyvinyl alcohol solution; Step 7: immerse 2 parts of the reinforced kelp network particles in 5 parts of the carbon nanotube polyvinyl alcohol solution and stir for 30 minutes; Step 8: Dry in a vacuum oven; Step 9: Place in a tubular furnace for sintering, introduce nitrogen at a rate of 80 mL / s, heat to 300°C at a rate of 7°C / min and keep warm for 30 minutes, then heat to 1100°C at a rate of 10°C / min and keep warm for 2 hours, and cool naturally to room temperature to obtain a conductive filler; Step 10: Mix 100 parts of polyester chips, 20 parts of conductive fillers and 8 parts of tackifiers, stir in a blender and mix well; Step 11: Put in an oven and dry at a temperature of 160° C. for 6 hours; Step 12: Put the dried material into the extruder for extrusion plasticization, and the heating temperature in the extruder is 265°C; Step 13: The plasticized material is molded at a molding temperature of 265° C., a molding pressure of 25 MPa, and a molding time of 45 seconds to obtain a conductive polyester material. Example 3 A method for preparing a conductive polyester material, in parts by weight, the preparation steps are as follows: Step 1: Take kelp, clean it and soak it in water to absorb water for 7 hours; Step 2: Take out, drain the water, place in low-temperature plasma for treatment for 80 seconds, the low-temperature plasma treatment voltage is 110 kV, and obtain the treated kelp; Step 3: Take 5 portions of the treated kelp, add 8 portions of cellulose solution with a concentration of 8 wt.%, stir for 2 hours, and then place in a high-voltage electrostatic field for 15 hours, wherein the voltage of the high-voltage electrostatic field is 20 kV, the electric field distance is 18 cm, and the electric field strength is 1500 V / cm; Step 4: After taking out, wash with deionized water, freeze-dry, and obtain a reinforced kelp network; Step 5: crushing and passing through a 270-mesh sieve to obtain reinforced kelp network particles; Step 6: Take 8 g of polyvinyl alcohol and 100 mL of water, stir to dissolve, add 0.8 g of carbon nanotubes, and stir evenly to obtain a carbon nanotube polyvinyl alcohol solution; Step 7: immerse 2 parts of the reinforced kelp network particles in 5 parts of the carbon nanotube polyvinyl alcohol solution and stir for 30 minutes; Step 8: Dry in a vacuum oven; Step 9: Place in a tubular furnace for sintering, introduce nitrogen at a rate of 80 mL / s, heat to 300°C at a rate of 7°C / min and keep warm for 30 minutes, then heat to 1100°C at a rate of 10°C / min and keep warm for 2 hours, and cool naturally to room temperature to obtain a conductive filler; Step 10: Mix 100 parts of polyester chips, 20 parts of conductive fillers and 8 parts of tackifiers, stir in a blender and mix well; Step 11: Put in an oven and dry at a temperature of 160° C. for 6 hours; Step 12: Put the dried material into the extruder for extrusion plasticization, and the heating temperature in the extruder is 265°C; Step 13: The plasticized material is molded at a molding temperature of 265° C., a molding pressure of 25 MPa, and a molding time of 45 seconds to obtain a conductive polyester material. Example 4 A method for preparing a conductive polyester material, in parts by weight, the preparation steps are as follows: Step 1: Take kelp, clean it and soak it in water to absorb water for 7 hours; Step 2: Take out, drain the water, place in low-temperature plasma for treatment for 60 seconds, the low-temperature plasma treatment voltage is 80kV, and obtain the treated kelp; Step 3: Take 5 portions of the treated kelp, add 8 portions of cellulose solution with a concentration of 8 wt.%, stir for 2 hours, and then place in a high-voltage electrostatic field for 15 hours, wherein the voltage of the high-voltage electrostatic field is 20 kV, the electric field distance is 18 cm, and the electric field strength is 1500 V / cm; Step 4: After taking out, wash with deionized water, freeze-dry, and obtain a reinforced kelp network; Step 5: crushing and passing through a 270-mesh sieve to obtain reinforced kelp network particles; Step 6: Take 8 g of polyvinyl alcohol and 100 mL of water, stir to dissolve, add 0.8 g of carbon nanotubes, and stir evenly to obtain a carbon nanotube polyvinyl alcohol solution; Step 7: immerse 2 parts of the reinforced kelp network particles in 5 parts of the carbon nanotube polyvinyl alcohol solution and stir for 30 minutes; Step 8: Dry in a vacuum oven; Step 9: Place in a tubular furnace for sintering, introduce nitrogen at a rate of 80 mL / s, heat to 300°C at a rate of 7°C / min and keep warm for 30 minutes, then heat to 1100°C at a rate of 10°C / min and keep warm for 2 hours, and cool naturally to room temperature to obtain a conductive filler; Step 10: Mix 100 parts of polyester chips, 20 parts of conductive fillers and 8 parts of tackifiers, stir in a blender and mix well; Step 11: Put in an oven and dry at a temperature of 160° C. for 6 hours; Step 12: Put the dried material into the extruder for extrusion plasticization, and the heating temperature in the extruder is 265°C; Step 13: The plasticized material is molded at a molding temperature of 265° C., a molding pressure of 25 MPa, and a molding time of 45 seconds to obtain a conductive polyester material. Example 5 A method for preparing a conductive polyester material, in parts by weight, the preparation steps are as follows: Step 1: Take kelp, clean it and soak it in water to absorb water for 7 hours; Step 2: Take out, drain the water, place in low-temperature plasma for treatment for 60 seconds, the low-temperature plasma treatment voltage is 110kV, and obtain the treated kelp; Step 3: Take 5 portions of the treated kelp, add 8 portions of a 6 wt.% cellulose solution, stir for 2 hours, and place in a high-voltage electrostatic field for 15 hours, wherein the voltage of the high-voltage electrostatic field is 20 kV, the electric field distance is 18 cm, and the electric field strength is 1500 V / cm; Step 4: After taking out, wash with deionized water, freeze-dry, and obtain a reinforced kelp network; Step 5: crushing and passing through a 270-mesh sieve to obtain reinforced kelp network particles; Step 6: Take 8 g of polyvinyl alcohol and 100 mL of water, stir to dissolve, add 0.8 g of carbon nanotubes, and stir evenly to obtain a carbon nanotube polyvinyl alcohol solution; Step 7: immerse 2 parts of the reinforced kelp network particles in 5 parts of the carbon nanotube polyvinyl alcohol solution and stir for 30 minutes; Step 8: Dry in a vacuum oven; Step 9: Place in a tubular furnace for sintering, introduce nitrogen at a rate of 80 mL / s, heat to 300°C at a rate of 7°C / min and keep warm for 30 minutes, then heat to 1100°C at a rate of 10°C / min and keep warm for 2 hours, and cool naturally to room temperature to obtain a conductive filler; Step 10: Mix 100 parts of polyester chips, 20 parts of conductive fillers and 8 parts of tackifiers, stir in a blender and mix well; Step 11: Put in an oven and dry at a temperature of 160° C. for 6 hours; Step 12: Put the dried material into the extruder for extrusion plasticization, and the heating temperature in the extruder is 265°C; Step 13: The plasticized material is molded at a molding temperature of 265° C., a molding pressure of 25 MPa, and a molding time of 45 seconds to obtain a conductive polyester material. Example 6 A method for preparing a conductive polyester material, in parts by weight, the preparation steps are as follows: Step 1: Take kelp, clean it and soak it in water to absorb water for 7 hours; Step 2: Take out, drain the water, place in low-temperature plasma for treatment for 60 seconds, the low-temperature plasma treatment voltage is 110kV, and obtain the treated kelp; Step 3: Take 5 parts of the treated kelp, add 8 parts of a 10wt.% cellulose solution, stir for 2 hours, and then place in a high-voltage electrostatic field for 15 hours, the voltage of the high-voltage electrostatic field is 20 kV, the electric field distance is 18 cm, and the electric field strength is 1500 V / cm; Step 4: After taking out, wash with deionized water, freeze-dry, and obtain a reinforced kelp network; Step 5: crushing and passing through a 270-mesh sieve to obtain reinforced kelp network particles; Step 6: Take 8 g of polyvinyl alcohol and 100 mL of water, stir to dissolve, add 0.8 g of carbon nanotubes, and stir evenly to obtain a carbon nanotube polyvinyl alcohol solution; Step 7: immerse 2 parts of the reinforced kelp network particles in 5 parts of the carbon nanotube polyvinyl alcohol solution and stir for 30 minutes; Step 8: Dry in a vacuum oven; Step 9: Place in a tubular furnace for sintering, introduce nitrogen at a rate of 80 mL / s, heat to 300°C at a rate of 7°C / min and keep warm for 30 minutes, then heat to 1100°C at a rate of 10°C / min and keep warm for 2 hours, and cool naturally to room temperature to obtain a conductive filler; Step 10: Mix 100 parts of polyester chips, 20 parts of conductive fillers and 8 parts of tackifiers, stir in a blender and mix well; Step 11: Put in an oven and dry at a temperature of 160° C. for 6 hours; Step 12: Put the dried material into the extruder for extrusion plasticization, and the heating temperature in the extruder is 265°C; Step 13: The plasticized material is molded at a molding temperature of 265° C., a molding pressure of 25 MPa, and a molding time of 45 seconds to obtain a conductive polyester material. Example 7 A method for preparing a conductive polyester material, in parts by weight, the preparation steps are as follows: Step 1: Take kelp, clean it and soak it in water to absorb water for 7 hours; Step 2: Take out, drain the water, place in low-temperature plasma for treatment for 60 seconds, the low-temperature plasma treatment voltage is 110kV, and obtain the treated kelp; Step 3: Take 5 portions of the treated kelp, add 8 portions of cellulose solution with a concentration of 8 wt.%, stir for 2 hours, and then place in a high-voltage electrostatic field for 15 hours, wherein the voltage of the high-voltage electrostatic field is 20 kV, the electric field distance is 18 cm, and the electric field strength is 1500 V / cm; Step 4: After taking out, wash with deionized water, freeze-dry, and obtain a reinforced kelp network; Step 5: crushing and passing through a 270-mesh sieve to obtain reinforced kelp network particles; Step 6: Take 8 g of polyvinyl alcohol and 100 mL of water, stir to dissolve, add 0.6 g of carbon nanotubes, and stir evenly to obtain a carbon nanotube polyvinyl alcohol solution; Step 7: immerse 2 parts of the reinforced kelp network particles in 5 parts of the carbon nanotube polyvinyl alcohol solution and stir for 30 minutes; Step 8: Dry in a vacuum oven; Step 9: Place in a tubular furnace for sintering, introduce nitrogen at a rate of 80 mL / s, heat to 300°C at a rate of 7°C / min and keep warm for 30 minutes, then heat to 1100°C at a rate of 10°C / min and keep warm for 2 hours, and cool naturally to room temperature to obtain a conductive filler; Step 10: Mix 100 parts of polyester chips, 20 parts of conductive fillers and 8 parts of tackifiers, stir in a blender and mix well; Step 11: Put in an oven and dry at a temperature of 160° C. for 6 hours; Step 12: Put the dried material into the extruder for extrusion plasticization, and the heating temperature in the extruder is 265°C; Step 13: The plasticized material is molded at a molding temperature of 265° C., a molding pressure of 25 MPa, and a molding time of 45 seconds to obtain a conductive polyester material. Example 8 A method for preparing a conductive polyester material, in parts by weight, the preparation steps are as follows: Step 1: Take kelp, clean it and soak it in water to absorb water for 7 hours; Step 2: Take out, drain the water, place in low-temperature plasma for treatment for 60 seconds, the low-temperature plasma treatment voltage is 110kV, and obtain the treated kelp; Step 3: Take 5 portions of the treated kelp, add 8 portions of cellulose solution with a concentration of 8 wt.%, stir for 2 hours, and then place in a high-voltage electrostatic field for 15 hours, wherein the voltage of the high-voltage electrostatic field is 20 kV, the electric field distance is 18 cm, and the electric field strength is 1500 V / cm; Step 4: After taking out, wash with deionized water, freeze-dry, and obtain a reinforced kelp network; Step 5: crushing and passing through a 270-mesh sieve to obtain reinforced kelp network particles; Step 6: Take 8 g of polyvinyl alcohol and 100 mL of water, stir to dissolve, add 1.0 g of carbon nanotubes, and stir evenly to obtain a carbon nanotube polyvinyl alcohol solution; Step 7: immerse 2 parts of the reinforced kelp network particles in 5 parts of the carbon nanotube polyvinyl alcohol solution and stir for 30 minutes; Step 8: Dry in a vacuum oven; Step 9: Place in a tubular furnace for sintering, introduce nitrogen at a rate of 80 mL / s, heat to 300°C at a rate of 7°C / min and keep warm for 30 minutes, then heat to 1100°C at a rate of 10°C / min and keep warm for 2 hours, and cool naturally to room temperature to obtain a conductive filler; Step 10: Mix 100 parts of polyester chips, 20 parts of conductive fillers and 8 parts of tackifiers, stir in a blender and mix well; Step 11: Put in an oven and dry at a temperature of 160° C. for 6 hours; Step 12: Put the dried material into the extruder for extrusion plasticization, and the heating temperature in the extruder is 265°C; Step 13: The plasticized material is molded at a molding temperature of 265° C., a molding pressure of 25 MPa, and a molding time of 45 seconds to obtain a conductive polyester material. Example 9 A method for preparing a conductive polyester material, in parts by weight, the preparation steps are as follows: Step 1: Take kelp, clean it and soak it in water to absorb water for 7 hours; Step 2: Take out, drain the water, place in low-temperature plasma for treatment for 60 seconds, the low-temperature plasma treatment voltage is 110kV, and obtain the treated kelp; Step 3: Take 5 portions of the treated kelp, add 8 portions of cellulose solution with a concentration of 8 wt.%, stir for 2 hours, and then place in a high-voltage electrostatic field for 15 hours, wherein the voltage of the high-voltage electrostatic field is 20 kV, the electric field distance is 18 cm, and the electric field strength is 1500 V / cm; Step 4: After taking out, wash with deionized water, freeze-dry, and obtain a reinforced kelp network; Step 5: crushing and passing through a 270-mesh sieve to obtain reinforced kelp network particles; Step 6: Take 8 g of polyvinyl alcohol and 100 mL of water, stir to dissolve, add 0.8 g of carbon nanotubes, and stir evenly to obtain a carbon nanotube polyvinyl alcohol solution; Step 7: immerse 2 parts of the reinforced kelp network particles in 5 parts of the carbon nanotube polyvinyl alcohol solution and stir for 30 minutes; Step 8: Dry in a vacuum oven; Step 9: Place in a tubular furnace for sintering, introduce nitrogen at a rate of 80 mL / s, heat to 300°C at a rate of 7°C / min and keep warm for 30 minutes, then heat to 1100°C at a rate of 10°C / min and keep warm for 2 hours, and cool naturally to room temperature to obtain a conductive filler; Step 10: Mix 100 parts of polyester chips, 15 parts of conductive fillers and 8 parts of tackifiers, stir in a blender and mix well; Step 11: Put in an oven and dry at a temperature of 160° C. for 6 hours; Step 12: Put the dried material into the extruder for extrusion plasticization, and the heating temperature in the extruder is 265°C; Step 13: The plasticized material is molded at a molding temperature of 265° C., a molding pressure of 25 MPa, and a molding time of 45 seconds to obtain a conductive polyester material. Example 10 A method for preparing a conductive polyester material, in parts by weight, the preparation steps are as follows: Step 1: Take kelp, clean it and soak it in water to absorb water for 7 hours; Step 2: Take out, drain the water, place in low-temperature plasma for treatment for 60 seconds, the low-temperature plasma treatment voltage is 110kV, and obtain the treated kelp; Step 3: Take 5 portions of the treated kelp, add 8 portions of cellulose solution with a concentration of 8 wt.%, stir for 2 hours, and then place in a high-voltage electrostatic field for 15 hours, wherein the voltage of the high-voltage electrostatic field is 20 kV, the electric field distance is 18 cm, and the electric field strength is 1500 V / cm; Step 4: After taking out, wash with deionized water, freeze-dry, and obtain a reinforced kelp network; Step 5: crushing and passing through a 270-mesh sieve to obtain reinforced kelp network particles; Step 6: Take 8 g of polyvinyl alcohol and 100 mL of water, stir to dissolve, add 0.8 g of carbon nanotubes, and stir evenly to obtain a carbon nanotube polyvinyl alcohol solution; Step 7: immerse 2 parts of the reinforced kelp network particles in 5 parts of the carbon nanotube polyvinyl alcohol solution and stir for 30 minutes; Step 8: Dry in a vacuum oven; Step 9: Place in a tubular furnace for sintering, introduce nitrogen at a rate of 80 mL / s, heat to 300°C at a rate of 7°C / min and keep warm for 30 minutes, then heat to 1100°C at a rate of 10°C / min and keep warm for 2 hours, and cool naturally to room temperature to obtain a conductive filler; Step 10: Mix 100 parts of polyester chips, 25 parts of conductive fillers and 8 parts of tackifiers, stir in a blender and mix well; Step 11: Put in an oven and dry at a temperature of 160° C. for 6 hours; Step 12: Put the dried material into the extruder for extrusion plasticization, and the heating temperature in the extruder is 265°C; Step 13: The plasticized material is molded at a molding temperature of 265° C., a molding pressure of 25 MPa, and a molding time of 45 seconds to obtain a conductive polyester material. Comparative Example 1 The difference between this embodiment and embodiment 2 is that no cellulose solution is used for strengthening. Specifically: A method for preparing a conductive polyester material, in parts by weight, the preparation steps are as follows: Step 1: Take kelp, clean it and soak it in water to absorb water for 7 hours; Step 2: Take out, drain the water, place in low-temperature plasma for treatment for 60 seconds, the low-temperature plasma treatment voltage is 110kV, and obtain the treated kelp; Step 3: taking 5 portions of the processed kelp, freeze-drying, and obtaining a kelp network; Step 4: crushing and passing through a 270-mesh sieve to obtain kelp network particles; Step 5: Take 8 g of polyvinyl alcohol and 100 mL of water, stir to dissolve, add 0.8 g of carbon nanotubes, and stir evenly to obtain a carbon nanotube polyvinyl alcohol solution; Step 6: immerse 2 parts of the strong kelp network particles in 5 parts of the carbon nanotube polyvinyl alcohol solution and stir for 30 minutes; Step 7: Dry in a vacuum oven; Step 8: Place in a tubular furnace for sintering, introduce nitrogen at a rate of 80 mL / s, heat to 300°C at a rate of 7°C / min and keep warm for 30 minutes, then heat to 1100°C at a rate of 10°C / min and keep warm for 2 hours, and cool naturally to room temperature to obtain a conductive filler; Step 9: Mix 100 parts of polyester chips, 20 parts of conductive fillers and 8 parts of tackifiers, stir in a blender and mix well; Step 10: Put in an oven and dry at a temperature of 160° C. for 6 hours; Step 11: Put the dried material into the extruder for extrusion plasticization, and the heating temperature in the extruder is 265°C; Step 12: The plasticized material is molded at a molding temperature of 265° C., a molding pressure of 25 MPa, and a molding time of 45 seconds to obtain a conductive polyester material. The conductivity of each embodiment was measured using a four-probe conductivity meter. The tensile strength and elongation at break were tested according to ASTM D638-2014. The sheet size (mm) was 200×20×3 and the tensile speed was 50 mm / min. Table 1 Electrical conductivity and mechanical properties of materials in various examples Conductivity (S / cm) Tensile strength(MPa) Elongation at break (%) Example 1 <![CDATA[8.64×10 -2 ]]> 360.4 314 Example 2 <![CDATA[9.29×10 -2 ]]> 363.8 329 Example 3 <![CDATA[9.33×10 -2 ]]> 362.7 324 Example 4 <![CDATA[9.08×10 -2 ]]> 363.1 325 Example 5 <![CDATA[8.77×10 -2 ]]> 358.9 320 Example 6 <![CDATA[9.32×10 -2 ]]> 364.2 331 Example 7 <![CDATA[7.32×10 -2 ]]> 358.0 307 Example 8 <![CDATA[9.51×10 -2 ]]> 364.3 335 Example 9 <![CDATA[2.26×10 -2 ]]> 339.9 302 Example 10 <![CDATA[2.17×10 -1 ]]> 366.7 338 Comparative Example 1 <![CDATA[1.63×10 -2 ]]> 344 301 Pure polyester sheet - 201.4 204

Claims

1. A conductive polyester material, characterized in that: The composition comprises the following components in parts by weight: 100 parts of polyester chips, 15-25 parts of conductive fillers, and 5-10 parts of tackifiers; The conductive filler is composed of an inner reinforced kelp network and an outer layer covered with dense carbon nanotubes.

2. A conductive polyester material according to claim 1, characterized in that: The preparation method of the conductive filler is as follows: Step 1: Take the kelp, clean it and soak it in water to absorb water for 6-8 hours; Step 2: taking out, draining the water, and placing in low-temperature plasma for treatment to obtain the treated kelp; Step 3: Add the treated kelp into the cellulose solution, stir for 1-2 hours and then place in a high voltage electrostatic field for treatment; Step 4: After taking out, wash with deionized water, freeze-dry, and obtain a reinforced kelp network; Step 5: crushing and passing through a 270-mesh sieve to obtain reinforced kelp network particles; Step 6: Immerse the reinforced kelp network particles in the carbon nanotube solution and stir for 20-40 minutes; Step 7: Dry in a vacuum oven; Step 8: Place in a tubular furnace for sintering to obtain a conductive filler.

3. A conductive polyester material according to claim 2, characterized in that: The low temperature plasma treatment conditions in step 2 are: treatment voltage 80-110 kV, treatment time 40-80 s.

4. A conductive polyester material according to claim 2, characterized in that: The concentration of the cellulose solution in step 3 is 4-9 wt.%.

5. A conductive polyester material according to claim 2, characterized in that: In step 3, the voltage of the high-voltage electrostatic field is 15-20 kV, the electric field distance is 15-20 cm, the electric field strength is 1000-1600 V / cm, and the treatment time is 10-16 h.

6. A conductive polyester material according to claim 2, characterized in that: The carbon nanotube solution in step 6 is a carbon nanotube polyvinyl alcohol solution, wherein the mass volume ratio of carbon nanotubes, polyvinyl alcohol and water is (0.6-1) g:8 g:100 mL.

7. A conductive polyester material according to claim 2, characterized in that: In step 6, the mass ratio of the reinforced kelp network to the carbon nanotube solution is 2:(4-5).

8. A conductive polyester material according to claim 2, characterized in that: The sintering in step 8 is specifically as follows: nitrogen is introduced at a rate of 80 mL / s, the temperature is increased to 300° C. at a rate of 7° C. / min and then kept at that temperature for 30 min, then the temperature is increased to 1000-1200° C. at a rate of 10° C. / min and kept at that temperature for 2 h, and then naturally cooled to room temperature.

9. A method for preparing a conductive polyester material according to any one of claims 1 to 8, characterized in that: The preparation steps are as follows: S1: Mix the polyester chips, the conductive filler and the tackifier in a blender to mix them evenly; S2: Place in an oven and dry at 150-170°C for 4-6 hours; S3: putting the dried material into an extruder for extrusion plasticization, and the heating temperature in the extruder is 260-265°C; S4: The plasticized material is molded and output to obtain a conductive polyester material.

10. The method for preparing a conductive polyester material according to claim 9, characterized in that: In step S4, the molding temperature is 255-265° C., the molding pressure is 20-30 MPa, and the molding time is 45 seconds.