WO2021086019A1 - 열가소성 수지 조성물 및 이를 이용한 성형품의 제조 방법 - Google Patents
열가소성 수지 조성물 및 이를 이용한 성형품의 제조 방법 Download PDFInfo
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- WO2021086019A1 WO2021086019A1 PCT/KR2020/014842 KR2020014842W WO2021086019A1 WO 2021086019 A1 WO2021086019 A1 WO 2021086019A1 KR 2020014842 W KR2020014842 W KR 2020014842W WO 2021086019 A1 WO2021086019 A1 WO 2021086019A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/10—Reinforcing macromolecular compounds with loose or coherent fibrous material characterised by the additives used in the polymer mixture
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
Definitions
- the present invention relates to a thermoplastic resin composition and a method of manufacturing a molded article using the same.
- electromagnetic waves generated from electronic devices can damage other devices or the human body.
- the present invention relates to a thermoplastic resin composition excellent in mechanical properties and electromagnetic shielding performance, and a method of manufacturing a molded article using the same.
- an exemplary embodiment of the present invention provides a thermoplastic resin composition comprising a thermoplastic resin, carbon fibers, carbon nanotubes, plate-shaped graphite, and metal fibers.
- An exemplary embodiment of the present invention comprises the steps of forming a first kneaded product by kneading a thermoplastic resin, a carbon nanotube, and a plate-shaped graphite; Adding and kneading carbon fibers to the first kneaded product to form a second kneaded product; Adding and kneading metal fibers to the second kneaded product to form a thermoplastic resin composition; And molding the thermoplastic resin composition to prepare a molded article.
- An exemplary embodiment of the present invention provides a molded article manufactured from the thermoplastic resin composition.
- thermoplastic resin composition according to an exemplary embodiment of the present invention may have excellent mechanical properties and electromagnetic wave shielding performance.
- the molded article manufacturing method according to an exemplary embodiment of the present invention can easily manufacture a molded article having excellent mechanical properties and electromagnetic wave shielding performance.
- FIG. 1 is a view showing a cross-section of an extruder used in a method for manufacturing a molded article according to an embodiment of the present invention.
- the unit "parts by weight” may mean a ratio of weight between each component.
- thermoplastic resin composition of the present invention and a method of manufacturing a molded article using the same will be described in more detail.
- thermoplastic resin a thermoplastic resin
- filler including carbon fibers, carbon nanotubes, plate-shaped graphite, and metal fibers.
- thermoplastic resin composition according to an exemplary embodiment of the present invention may have excellent mechanical properties and electromagnetic wave shielding performance.
- the thermoplastic resin may include at least one of a nylon resin, a polycarbonate resin, a polyalkylene terephthalate resin, and a maleic anhydride-modified polyolefin resin.
- the thermoplastic resin composition is mechanically Molded products with excellent physical properties can be easily implemented.
- the thermoplastic resin may include at least one of a nylon resin, a polycarbonate resin, a polybutylene terephthalate resin, a polyethylene terephthalate, and a maleic anhydride-modified polyolefin resin.
- a thermoplastic resin composition including at least one of a nylon resin, a polycarbonate resin, a polybutylene terephthalate resin, and a maleic anhydride-modified polyolefin resin can easily implement a molded article having excellent mechanical properties.
- the maleic anhydride-modified polyolefin resin may be a polymer in which maleic anhydride is grafted to a polyolefin resin with a grafting rate of 0.5% by weight or more and 2% by weight or less.
- a thermoplastic resin composition comprising a polyolefin resin grafted with maleic anhydride of 0.5% by weight or more and 2% by weight or less can provide a molded article having excellent mechanical properties such as tensile strength and impact strength.
- the graft rate can be measured from the result obtained by acid-base titration of the modified polyolefin resin.
- 1 g of the modified polyolefin resin is added to 150 ml of xylene saturated with water and refluxed for about 2 hours, and then 1% by weight thymol blue -After adding a small amount of dimethylformamide solution and titrating slightly with 0.05N sodium hydroxide-ethyl alcohol solution to obtain an ultramarine solution, this solution was again titrated with 0.05N hydrochloric acid-isopropyl alcohol solution until yellowish color was obtained.
- the acid value is obtained, and the content (% by weight) of the compound grafted onto the modified polyolefin resin, that is, maleic anhydride can be calculated.
- the content of maleic anhydride contained in the modified polyolefin resin corresponds to the graft rate.
- the polyolefin grafted with maleic anhydride may be a polymer of monomers including an olefin having 1 to 5 carbon atoms.
- the present invention may use polyethylene grafted with maleic anhydride at a grafting ratio of 0.5% by weight or more and 2% by weight or less.
- the carbon fiber may have a diameter of 5 ⁇ m or more and 15 ⁇ m or less.
- the carbon fiber may have a diameter of 7 ⁇ m or more and 13 ⁇ m or less, 8.5 ⁇ m or more and 12.5 ⁇ m or less, 5 ⁇ m or more and 7.5 ⁇ m or less, 9 ⁇ m or more and 12.5 ⁇ m or less, or 12 ⁇ m or more and 15 ⁇ m or less.
- the thermoplastic resin composition including carbon fibers whose diameter satisfies the above-described range may be excellent in processing and molding, while improving strength.
- the thermoplastic resin composition including the carbon fiber may improve electromagnetic wave shielding properties.
- the diameter of the carbon fiber can be measured using a scanning electron microscope (SEM). Specifically, 20 fiber strands are selected using a scanning electron microscope, and an icon bar capable of measuring the diameter is selected. Measure each diameter by using, and calculate the average diameter by arithmetic average.
- SEM scanning electron microscope
- the content of the carbon fiber may be 5 parts by weight or more and 60 parts by weight or less based on 100 parts by weight of the thermoplastic resin. Specifically, based on 100 parts by weight of the thermoplastic resin, the content of the carbon fiber is 10 parts by weight or more and 50 parts by weight or less, 15 parts by weight or more and 45 parts by weight or less, 17.5 parts by weight or more and 40 parts by weight or less, or 20 parts by weight or more. It may be up to 35 parts by weight.
- the content of the carbon fiber is 5 parts by weight or more and 20 parts by weight or less, 7.5 parts by weight or more and 25 parts by weight or less, 10 parts by weight or more and 35 parts by weight or less, 20 parts by weight or more, based on 100 parts by weight of the thermoplastic resin. It may be 40 parts by weight or less, 25 parts by weight or more and 45 parts by weight or less, or 30 parts by weight or more and 60 parts by weight or less.
- the strength of the thermoplastic resin composition may be improved, and the appearance quality of the molded article of the thermoplastic resin composition may be excellent.
- the thermoplastic resin composition may more easily implement a molded article having excellent rigidity and improved electromagnetic shielding efficiency.
- the BET surface area of the carbon nanotube may be 200 m 2 /g or more and 300 m 2 /g or less.
- the BET surface area of the carbon nanotubes is 220 m 2 /g or more and 280 m 2 /g or less, 250 m 2 /g or more and 270 m 2 /g or less, 210 m 2 /g or more and 240 m 2 /g or less, It may be 245 m 2 /g or more and 265 m 2 /g or less, or 275 m 2 /g or more and 300 m 2 /g or less.
- the thermoplastic resin composition including the carbon nanotubes having a BET surface area that satisfies the above-described range may improve conductivity and electromagnetic wave shielding efficiency.
- the BET surface area can be measured using a nitrogen gas adsorption method, using a BET analysis equipment (Micromeritics' Surface Area and Porosity Analyzer ASAP 2020 equipment).
- the content of the carbon nanotubes may be 1 part by weight or more and 5 parts by weight or less based on 100 parts by weight of the thermoplastic resin. Specifically, based on 100 parts by weight of the thermoplastic resin, the content of the carbon nanotubes is 1 part by weight or more and 3 parts by weight or less, 1 part by weight or more and 2 parts by weight or less, 1 part by weight or more and 2.5 parts by weight or less, or 3 parts by weight It may be more than 5 parts by weight or less.
- thermoplastic resin and the carbon nanotubes By controlling the relative content of the thermoplastic resin and the carbon nanotubes within the above-described range, the conductivity and electronic shielding efficiency of the thermoplastic resin composition can be effectively improved. In addition, when the content of the carbon nanotube is within the above-described range, it is possible to suppress deterioration of the mechanical properties of the thermoplastic resin composition.
- the thermoplastic resin composition may include plate-shaped graphite.
- the electromagnetic wave shielding efficiency of the thermoplastic resin composition can be further improved.
- the plate-shaped graphite is not particularly limited if it is a plate-shaped graphite commonly recognized in the technical field to which the present invention belongs, and such plate-shaped graphite may be described as having a high aspect ratio. It may be chemically or physically separated from the structure to have a plate shape, and as a specific example, the aspect ratio may be 2 or more, 5 or more, 7 or more, 2 to 200 or less, 5 to 200, or 7 to 200, but is not limited thereto. .
- the aspect ratio is not particularly limited when measured by a measurement method commonly used in the technical field to which the present invention belongs.
- the content of the plate-shaped graphite may be 1 part by weight or more and 10 parts by weight or less based on 100 parts by weight of the thermoplastic resin.
- the content of the plate-shaped graphite is 1.5 parts by weight or more and 8 parts by weight or less, 3 parts by weight or more and 5 parts by weight or less, 1 part by weight or more and 5 parts by weight or less, 2.5 parts by weight or more and 5.5 parts by weight based on 100 parts by weight of the thermoplastic resin. It may be less than or equal to 6 parts by weight or less than or equal to 6 parts by weight and less than or equal to 10 parts by weight.
- the electromagnetic wave shielding efficiency of the thermoplastic resin composition may be further improved.
- the relative content of the thermoplastic resin and the plate-shaped graphite is within the above-described range, it is possible to prevent the mechanical properties of the thermoplastic resin composition from deteriorating, and to implement a molded article having excellent appearance quality.
- the metal fiber may have a diameter of 5 ⁇ m or more and 20 ⁇ m or less.
- the metal fiber may have a diameter of 7 ⁇ m or more and 18 ⁇ m or less, 9 ⁇ m or more and 15 ⁇ m or less, 5 ⁇ m or more and 10 ⁇ m or less, 7.5 ⁇ m or more and 14.5 ⁇ m or less, or 16 ⁇ m or more and 20 ⁇ m or less.
- the diameter of the metal fiber is within the above-described range, the electromagnetic wave shielding performance of the thermoplastic resin composition may be more improved.
- the diameter of the metal fiber can be measured using a scanning electron microscope (SEM), and specifically, an icon bar capable of selecting 20 metal fiber strands using a scanning electron microscope and measuring the diameter Measure each diameter using, and then calculate the average diameter by arithmetic average.
- SEM scanning electron microscope
- the content of the metal fiber may be 1 part by weight or more and 20 parts by weight or less based on 100 parts by weight of the thermoplastic resin. Specifically, based on 100 parts by weight of the thermoplastic resin, the content of the metal fiber is 3 parts by weight or more and 18 parts by weight or less, 5 parts by weight or more and 15 parts by weight or less, 7 parts by weight or more and 10 parts by weight or less, 1 part by weight or more 7 It may be not more than 3.5 parts by weight, not more than 17.5 parts by weight, or not less than 12 parts by weight and not more than 20 parts by weight.
- the stiffness and electronic shielding performance of the thermoplastic resin composition may be further improved.
- thermoplastic resin composition may provide a molded article having excellent appearance quality.
- the thermoplastic resin composition of the present invention may have a tensile strength of preferably 150 MPa or more, more preferably 160 MPa or more, even more preferably 165 MPa or more, according to ASTM D638, and a preferred example, 150 to 200 MPa, more preferably For example, it is 160 to 190 MPa, more preferably 165 to 190 MPa, and within this range, there is an advantage of excellent tensile strength and excellent physical property balance.
- the thermoplastic resin composition of the present invention may have an impact strength of preferably 60 J/m or more, more preferably 65 J/m or more, even more preferably 70 J/m or more, based on ISO 180A, and a preferred example is 60 To 130 J/m, more preferably 65 to 120 J/m, more preferably 70 to 120 J/m, and there is an advantage of excellent impact strength and excellent balance of properties within this range.
- the thermoplastic resin composition of the present invention may have a flexural modulus of preferably 18,000 MPa or more, more preferably 19,000 MPa or more, even more preferably 21,000 MPa or more, and a preferred example, 18,000 to 26,000 MPa, more preferably according to ASTM D790.
- a flexural modulus of preferably 18,000 MPa or more, more preferably 19,000 MPa or more, even more preferably 21,000 MPa or more, and a preferred example, 18,000 to 26,000 MPa, more preferably according to ASTM D790.
- it is 19,000 to 25,000 MPa, more preferably 21,000 to 25,000 MPa, and within this range, there is an advantage in that the flexural modulus is excellent and the physical property balance is excellent.
- the thermoplastic resin composition of the present invention may have an electromagnetic wave shielding ability of preferably 65 MHz or more, more preferably 70 MHz or more, even more preferably 73 MHz or more, using EM2107A of Electro metrics Co., Ltd. under 10 MHz conditions.
- an electromagnetic wave shielding ability preferably 65 MHz or more, more preferably 70 MHz or more, even more preferably 73 MHz or more, using EM2107A of Electro metrics Co., Ltd. under 10 MHz conditions.
- 65 to 90 MHz, more preferably 70 to 85 MHz, more preferably 73 to 85 MHz, and within this range there is an advantage of excellent electromagnetic wave shielding properties and excellent mechanical property balance.
- the thermoplastic resin composition of the present invention may have an electromagnetic wave shielding capacity of preferably 65 GHz or more, more preferably 70 GHz or more, and even more preferably 73 GHz or more, using EM2107A of Electro metrics Co., Ltd.
- it is 65 to 90 GHz, more preferably 70 to 85 GHz, more preferably 73 to 85 GHz, and there is an advantage of excellent electromagnetic wave shielding properties and excellent mechanical property balance within this range.
- the thermoplastic resin composition of the present invention may be preferably used for automobile parts or electric and electronic parts, and more preferably used for automobile parts or electric and electronic parts requiring electromagnetic wave shielding of 50 dB or more in the MHz and GHz frequency ranges. More preferably, it is used for an automobile metal part or a substitute for an electric/electronic metal part, and even more preferably it is used for an electric vehicle part or a hybrid electric vehicle part.
- the automobile parts or electric and electronic parts may be defined as containing the thermoplastic resin composition of the present invention or manufactured from the thermoplastic resin composition of the present invention.
- An exemplary embodiment of the present invention comprises the steps of forming a first kneaded product by kneading a thermoplastic resin, a carbon nanotube, and a plate-shaped graphite; Adding and kneading carbon fibers to the first kneaded product to form a second kneaded product; Adding and kneading metal fibers to the second kneaded product to form a thermoplastic resin composition; And molding the thermoplastic resin composition to prepare a molded article.
- the molded article manufacturing method according to an exemplary embodiment of the present invention can easily manufacture a molded article having excellent mechanical properties and electromagnetic wave shielding performance.
- a method of manufacturing a molded article according to an exemplary embodiment of the present invention may be a method of manufacturing a molded article using the thermoplastic resin composition according to the exemplary embodiment described above.
- thermoplastic resin, carbon fiber, carbon nanotube, plate-shaped graphite and metal fiber used in the method for manufacturing a molded article according to an exemplary embodiment of the present invention are thermoplastic resin, carbon fiber, carbon nanotube included in the above-described thermoplastic resin composition. It may be the same as a tube, a plate-shaped graphite, and a metal fiber, respectively.
- the method for manufacturing a molded article according to an exemplary embodiment of the present invention is to more effectively manufacture a molded article having excellent mechanical properties and electromagnetic wave blocking performance by controlling the order of kneading a thermoplastic resin, carbon fiber, carbon nanotube, plate-shaped graphite, and metal fiber. I can.
- the extruder 100 may include first to third inlets 11, 12 and 13, first to third kneading blocks 21, 22, and 23, and the first direction DR1 ), the material input can be kneaded and discharged. Specifically, materials injected into the first inlet 11 may be kneaded while being moved to the first kneading block 21 to form a first kneaded product in the first kneading block 21.
- the materials injected into the second inlet 12 may be mixed with the first kneaded material and kneaded in the process of being moved to the second kneading block 22 to form a second kneaded material in the second kneading block 22.
- the materials injected into the third inlet 13 may be mixed with the second kneaded material and kneaded in the process of being moved to the third kneading block 23 to form a final product in the third kneading block 23.
- a first kneaded product may be formed by kneading a thermoplastic resin, a carbon nanotube, and a plate-shaped graphite.
- a first kneaded product may be formed in the first kneading block 21 by injecting and kneading a thermoplastic resin, a carbon nanotube, and a plate-shaped graphite through the first inlet 11.
- the amount of carbon nanotubes added may be 1 part by weight or more and 5 parts by weight or less based on 100 parts by weight of the thermoplastic resin. Specifically, based on 100 parts by weight of the thermoplastic resin, the input amount of the carbon nanotubes is 1 part by weight or more and 3 parts by weight or less, 1 part by weight or more and 2 parts by weight or less, 1 part by weight or more and 2.5 parts by weight or less, or 3 parts by weight It may be more than 5 parts by weight or less.
- thermoplastic resin and the carbon nanotubes By adjusting the relative input amount of the thermoplastic resin and the carbon nanotubes within the above-described range, it is possible to effectively improve the conductivity and electronic shielding efficiency of the manufactured molded article. In addition, when the amount of the carbon nanotubes added is within the above-described range, it is possible to suppress deterioration of the mechanical properties of the molded article.
- the input amount of the plate-shaped graphite may be 1 part by weight or more and 10 parts by weight or less based on 100 parts by weight of the thermoplastic resin.
- the input amount of the plate-shaped graphite is 1.5 parts by weight or more and 8 parts by weight or less, 3 parts by weight or more and 5 parts by weight or less, 1 part by weight or more and 5 parts by weight or less, 2.5 parts by weight or more and 5.5 parts by weight based on 100 parts by weight of the thermoplastic resin. It may be less than or equal to 6 parts by weight or less than or equal to 6 parts by weight and less than or equal to 10 parts by weight.
- the electromagnetic wave shielding efficiency of the molded article can be further improved.
- the relative input amount of the thermoplastic resin and the plate-shaped graphite is within the above-described range, it is possible to prevent the mechanical properties of the molded article from deteriorating, and to implement a molded article having excellent appearance quality.
- the carbon fiber may be added to the first kneaded product and kneaded to form a second kneaded product.
- a second kneaded material may be formed in the second kneading block 22.
- the input amount of the carbon fiber may be 5 parts by weight or more and 60 parts by weight or less based on 100 parts by weight of the thermoplastic resin. Specifically, based on 100 parts by weight of the thermoplastic resin, the input amount of the carbon fiber is 10 parts by weight or more and 50 parts by weight or less, 15 parts by weight or more and 45 parts by weight or less, 17.5 parts by weight or more and 40 parts by weight or less, or 20 parts by weight or more. It may be up to 35 parts by weight.
- thermoplastic resin and the carbon fiber By adjusting the relative input amount of the thermoplastic resin and the carbon fiber within the above-described range, a molded article having improved strength and excellent appearance quality can be manufactured. In addition, when the amount of the carbon fiber is within the above-described range, a molded article having excellent rigidity and improved electromagnetic wave shielding efficiency may be more easily implemented.
- the metal fiber may be added to the second kneaded product and kneaded to form a thermoplastic resin composition.
- a thermoplastic resin composition may be formed in the third kneading block 23.
- the input amount of the metal fiber may be 1 part by weight or more and 20 parts by weight or less based on 100 parts by weight of the thermoplastic resin. Specifically, based on 100 parts by weight of the thermoplastic resin, the input amount of the metal fiber is 3 parts by weight or more and 18 parts by weight or less, 5 parts by weight or more and 15 parts by weight or less, 7 parts by weight or more and 10 parts by weight or less, 1 part by weight or more and 7 It may be not more than 3.5 parts by weight, not more than 17.5 parts by weight, or not less than 12 parts by weight and not more than 20 parts by weight.
- the rigidity of the molded article and the electronic shielding performance may be further improved. Furthermore, when the relative input amount of the thermoplastic resin and the metal fiber is within the above-described range, a molded article having excellent appearance quality can be provided.
- the molded article in the molding of the thermoplastic resin composition, may be manufactured by extrusion molding or injection molding the thermoplastic resin composition. That is, the molded article may be formed by injection molding the thermoplastic resin composition, or may be formed by extrusion molding.
- the thermoplastic resin composition may be injection-molded or extrusion-molded.
- the molded article may be formed by kneading and extruding the thermoplastic resin composition.
- a conventional extruder may be used, and a single screw extruder, a twin screw extruder, and the like may be used as a preferred example.
- the molded article of the present invention may include the thermoplastic resin composition.
- the molded article may preferably be an automobile part or an electric and electronic part, more preferably an automobile part or an electric and electronic part requiring electromagnetic wave shielding of 50 dB or more in the MHz and GHz frequency range, and more preferably an automobile metal part or It is a substitute for electric and electronic metal parts, and even more preferably, it may be an electric vehicle part or a hybrid electric vehicle part.
- Nylon 66 resin Invista's 3602 product was used.
- Modified polyolefin resin Polyethylene grafted with maleic anhydride at a grafting rate of about 1.5% by weight was used.
- Nylon 6 resin TK Chemical's 2451 product was used.
- PET resin BB8055 manufactured by SK Chemicals was used.
- thermoplastic resin composition and a molded article an extruder as shown in FIG. 1 was prepared. At this time, the temperature of the extruder was set to about 250° C. to 320° C., and the number of rotations was set to 300 rotations/minute.
- nylon 66 resin, carbon nanotubes, and plate-shaped graphite were introduced as thermoplastic resins into the first inlet 11 and kneaded to form a first kneaded product.
- the amount of carbon nanotubes added was 1 part by weight, and the amount of plate-shaped graphite was 3 parts by weight.
- carbon fibers were introduced into the second inlet 12 and kneaded to form a second kneaded product.
- the input amount of the carbon fiber was 35 parts by weight based on 100 parts by weight of the thermoplastic resin.
- thermoplastic resin composition Thereafter, metal fibers were introduced into the third inlet 13 and kneaded to form a thermoplastic resin composition. At this time, the input amount of the metal fiber was 5 parts by weight based on 100 parts by weight of the thermoplastic resin.
- thermoplastic resin composition was molded into a pellet form through an extruder to manufacture a molded article.
- thermoplastic resin composition and a molded article were prepared in the same manner as in Example 1, except that the components and contents added to the extruder were adjusted as shown in Table 1 below.
- thermoplastic resin composition and a molded article were prepared in the same manner as in Example 1, except that the components and contents added to the extruder were adjusted as shown in Table 2 below.
- Notched Izod impact strength was measured according to ISO 180A. At this time, the thickness of the specimen was 4 mm, and after notched in the specimen, it was measured at room temperature (23 °C).
- Electromagnetic shielding ability Electrometrics' EM2107A was used to measure the electromagnetic wave shielding ability of the specimen at 10 MHz and 1 GHz.
- the molded articles according to Examples 1 to 11 of the present invention had excellent mechanical properties and remarkably excellent electromagnetic shielding properties compared to Comparative Examples 1 to 4.
- the molded articles according to Examples 1 to 11 of the present invention showed an electromagnetic wave shielding ability of 70 dB or more at 10 MHz, and an electromagnetic wave shielding ability of 70 dB or more at 1 GHz.
- thermoplastic resin composition according to the exemplary embodiment of the present invention has excellent mechanical properties and electromagnetic wave shielding properties, and thus can be easily applied to automobiles and other electric and electronic parts requiring electromagnetic wave shielding.
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Abstract
Description
구분 | 실시예 | ||||||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | |||
A | a1 | 100 | 100 | 90 | 100 | 100 | 100 | 100 | |||||
a2 | 100 | ||||||||||||
a3 | 100 | ||||||||||||
a4 | 10 | ||||||||||||
a5 | 100 | ||||||||||||
a6 | 100 | ||||||||||||
B | 35 | 30 | 30 | 20 | 30 | 50 | 65 | 20 | 30 | 35 | 35 | ||
C | c1 | 1 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | |||
c2 | 1 | ||||||||||||
c3 | 1 | ||||||||||||
D | 3 | 3 | 3 | 5 | 5 | 3 | 3 | 5 | 5 | 3 | 3 | ||
E | 5 | 10 | 5 | 10 | 15 | 5 | 5 | 10 | 15 | 5 | 5 |
구분 | 비교예 1 | 비교예 2 | 비교예 3 | 비교예 4 | |
A | a1 | 100 | 100 | ||
a2 | 100 | ||||
a3 | 100 | ||||
a4 | |||||
B | 30 | 30 | 20 | 30 | |
C | 1 | 1 | 7 | - | |
D | - | 5 | - | 2 | |
E | 5 | - | - | 5 |
평가 | 실시예 | |||||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | ||
인장강도(MPa) | 185 | 175 | 165 | 155 | 162 | 190 | 191 | 150 | 162 | 181 | 183 | |
충격강도(J/m) | 91 | 72 | 115 | 69 | 87 | 93 | 90 | 70 | 87 | 92 | 90 | |
굴곡탄성률(MPa) | 24,500 | 23,000 | 21,000 | 19,000 | 22,500 | 28,000 | 29,500 | 19,000 | 22,000 | 24,200 | 24,300 | |
전자파 차폐(dB) | 10 MHz | 75 | 79 | 73 | 74 | 82 | 80 | 74 | 77 | 75 | 74 | 77 |
1 MHz | 80 | 78 | 75 | 73 | 76 | 84 | 73 | 81 | 80 | 79 | 83 | |
외관 품질 | ○ | ◎ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ |
평가 | 비교예 1 | 비교예 2 | 비교예 3 | 비교예 4 | |
인장강도(MPa) | 175 | 168 | 134 | 155 | |
충격강도(J/m) | 70 | 73 | 60 | 72 | |
굴곡탄성률(MPa) | 20,000 | 21,500 | 15,000 | 19,500 | |
전자파 차폐(dB) | 10 MHz | 54 | 45 | 40 | 49 |
1 MHz | 48 | 43 | 39 | 41 | |
외관 품질 | X | △ | XX | ○ |
Claims (14)
- 열가소성 수지, 탄소섬유, 탄소나노튜브, 판상형 그라파이트 및 금속섬유를 포함하는 것을 특징으로 하는 열가소성 수지 조성물.
- 청구항 1에 있어서,상기 열가소성 수지는,나일론 수지, 폴리카보네이트 수지, 폴리 알킬렌테레프탈레이트 수지 및 무수말레산 변성 폴리올레핀 수지 중 적어도 하나를 포함하는 것을 특징으로 하는 열가소성 수지 조성물.
- 청구항 2에 있어서,상기 무수말레산 변성 폴리올레핀 수지는 폴리올레핀 수지에 무수말레산이 그라프트율 0.5 중량% 이상 2 중량% 이하로 그라프트된 중합체인 것을 특징으로 하는 열가소성 수지 조성물.
- 청구항 1에 있어서,상기 탄소섬유는 직경이 5 ㎛ 이상 15 ㎛ 이하인 것을 특징으로 하는 열가소성 수지 조성물.
- 청구항 1에 있어서,상기 탄소섬유의 함량은 상기 열가소성 수지 100 중량부에 대하여 5 중량부 이상 60 중량부 이하인 것을 특징으로 하는 열가소성 수지 조성물.
- 청구항 1에 있어서,상기 탄소나노튜브의 BET 표면적은 200 m2/g 이상 300 m2/g 이하인 것을 특징으로 하는 열가소성 수지 조성물.
- 청구항 1에 있어서,상기 탄소나노튜브의 함량은 상기 열가소성 수지 100 중량부에 대하여 1 중량부 이상 5 중량부 이하인 것을 특징으로 하는 열가소성 수지 조성물.
- 청구항 1에 있어서,상기 판상형 그라파이트의 함량은 상기 열가소성 수지 100 중량부에 대하여 1 중량부 이상 10 중량부 이하인 것을 특징으로 하는 열가소성 수지 조성물.
- 청구항 1에 있어서,상기 금속섬유는 직경이 5 ㎛ 이상 20 ㎛ 이하인 것을 특징으로 하는 열가소성 수지 조성물.
- 청구항 1에 있어서,상기 열가소성 수지 조성물은 Electro metrics社의 EM2107A를 사용하여 10 MHz 조건에서의 전자파 차폐 능력(dB)이 65 MHz 이상 또는 1 GHz 조건에서의 전자파 차폐 능력(dB)이 65 GHz 이상인 것을 특징으로 하는 열가소성 수지 조성물.
- 청구항 10에 있어서,상기 열가소성 수지 조성물은 MHz과 GHz 주파수 영역에서 50 dB 이상의 전자파 차폐가 요구되는 자동차 부품 또는 전기전자 부품에 사용되는 것을 특징으로 하는 열가소성 수지 조성물.
- 청구항 1에 있어서,상기 금속 섬유의 함량은 상기 열가소성 수지 100 중량부에 대하여 1 중량부 이상 20 중량부 이하인 것을 특징으로 하는 열가소성 수지 조성물.
- 열가소성 수지, 탄소나노튜브 및 판상형 그라파이트를 혼련하여 제1 혼련물을 형성하는 단계;상기 제1 혼련물에 탄소섬유를 투입하고 혼련하여 제2 혼련물을 형성하는 단계;상기 제2 혼련물에 금속섬유를 투입하고 혼련하여 열가소성 수지 조성물을 형성하는 단계; 및상기 열가소성 수지 조성물을 성형하여 성형품을 제조하는 단계;를 포함하는 것을 특징으로 하는성형품 제조 방법.
- 청구항 1 내지 12 중 어느 한 항의 열가소성 수지 조성물을 포함하여 이루어진 것을 특징으로 하는성형품.
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